Renamed files bytesobject.[ch] and stringobject.[ch]

Fixed Windows build

10 files changed, 6457 insertions, 6457 deletions

diff --git a/Include/Python.h b/Include/Python.h
index 53f7f59..539de51 100644
--- a/Include/Python.h
+++ b/Include/Python.h
@@ -65,6 +65,7 @@
 
 #include "pydebug.h"
 
+#include "bytearrayobject.h"
 #include "bytesobject.h"
 #include "unicodeobject.h"
 #include "longobject.h"
@@ -75,7 +76,6 @@
 #include "complexobject.h"
 #endif
 #include "rangeobject.h"
-#include "stringobject.h"
 #include "memoryobject.h"
 #include "tupleobject.h"
 #include "listobject.h"
diff --git a/Include/bytearrayobject.h b/Include/bytearrayobject.h
new file mode 100644
index 0000000..2c0b734
--- /dev/null
+++ b/Include/bytearrayobject.h
@@ -0,0 +1,53 @@
+/* Bytes object interface */
+
+#ifndef Py_BYTESOBJECT_H
+#define Py_BYTESOBJECT_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdarg.h>
+
+/* Type PyByteArrayObject represents a mutable array of bytes.
+ * The Python API is that of a sequence;
+ * the bytes are mapped to ints in [0, 256).
+ * Bytes are not characters; they may be used to encode characters.
+ * The only way to go between bytes and str/unicode is via encoding
+ * and decoding.
+ * For the convenience of C programmers, the bytes type is considered
+ * to contain a char pointer, not an unsigned char pointer.
+ */
+
+/* Object layout */
+typedef struct {
+    PyObject_VAR_HEAD
+    /* XXX(nnorwitz): should ob_exports be Py_ssize_t? */
+    int ob_exports; /* how many buffer exports */
+    Py_ssize_t ob_alloc; /* How many bytes allocated */
+    char *ob_bytes;
+} PyByteArrayObject;
+
+/* Type object */
+PyAPI_DATA(PyTypeObject) PyByteArray_Type;
+PyAPI_DATA(PyTypeObject) PyByteArrayIter_Type;
+
+/* Type check macros */
+#define PyByteArray_Check(self) PyObject_TypeCheck(self, &PyByteArray_Type)
+#define PyByteArray_CheckExact(self) (Py_TYPE(self) == &PyByteArray_Type)
+
+/* Direct API functions */
+PyAPI_FUNC(PyObject *) PyByteArray_FromObject(PyObject *);
+PyAPI_FUNC(PyObject *) PyByteArray_Concat(PyObject *, PyObject *);
+PyAPI_FUNC(PyObject *) PyByteArray_FromStringAndSize(const char *, Py_ssize_t);
+PyAPI_FUNC(Py_ssize_t) PyByteArray_Size(PyObject *);
+PyAPI_FUNC(char *) PyByteArray_AsString(PyObject *);
+PyAPI_FUNC(int) PyByteArray_Resize(PyObject *, Py_ssize_t);
+
+/* Macros, trading safety for speed */
+#define PyByteArray_AS_STRING(self) (assert(PyByteArray_Check(self)),((PyByteArrayObject *)(self))->ob_bytes)
+#define PyByteArray_GET_SIZE(self)  (assert(PyByteArray_Check(self)),Py_SIZE(self))
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_BYTESOBJECT_H */
diff --git a/Include/bytesobject.h b/Include/bytesobject.h
index 2c0b734..1c73fde 100644
--- a/Include/bytesobject.h
+++ b/Include/bytesobject.h
@@ -1,53 +1,111 @@
-/* Bytes object interface */
 
-#ifndef Py_BYTESOBJECT_H
-#define Py_BYTESOBJECT_H
+/* String object interface */
+
+#ifndef Py_STRINGOBJECT_H
+#define Py_STRINGOBJECT_H
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 #include <stdarg.h>
 
-/* Type PyByteArrayObject represents a mutable array of bytes.
- * The Python API is that of a sequence;
- * the bytes are mapped to ints in [0, 256).
- * Bytes are not characters; they may be used to encode characters.
- * The only way to go between bytes and str/unicode is via encoding
- * and decoding.
- * For the convenience of C programmers, the bytes type is considered
- * to contain a char pointer, not an unsigned char pointer.
- */
-
-/* Object layout */
+/*
+Type PyBytesObject represents a character string.  An extra zero byte is
+reserved at the end to ensure it is zero-terminated, but a size is
+present so strings with null bytes in them can be represented.  This
+is an immutable object type.
+
+There are functions to create new string objects, to test
+an object for string-ness, and to get the
+string value.  The latter function returns a null pointer
+if the object is not of the proper type.
+There is a variant that takes an explicit size as well as a
+variant that assumes a zero-terminated string.  Note that none of the
+functions should be applied to nil objects.
+*/
+
+/* Caching the hash (ob_shash) saves recalculation of a string's hash value.
+   This significantly speeds up dict lookups. */
+
 typedef struct {
     PyObject_VAR_HEAD
-    /* XXX(nnorwitz): should ob_exports be Py_ssize_t? */
-    int ob_exports; /* how many buffer exports */
-    Py_ssize_t ob_alloc; /* How many bytes allocated */
-    char *ob_bytes;
-} PyByteArrayObject;
-
-/* Type object */
-PyAPI_DATA(PyTypeObject) PyByteArray_Type;
-PyAPI_DATA(PyTypeObject) PyByteArrayIter_Type;
-
-/* Type check macros */
-#define PyByteArray_Check(self) PyObject_TypeCheck(self, &PyByteArray_Type)
-#define PyByteArray_CheckExact(self) (Py_TYPE(self) == &PyByteArray_Type)
-
-/* Direct API functions */
-PyAPI_FUNC(PyObject *) PyByteArray_FromObject(PyObject *);
-PyAPI_FUNC(PyObject *) PyByteArray_Concat(PyObject *, PyObject *);
-PyAPI_FUNC(PyObject *) PyByteArray_FromStringAndSize(const char *, Py_ssize_t);
-PyAPI_FUNC(Py_ssize_t) PyByteArray_Size(PyObject *);
-PyAPI_FUNC(char *) PyByteArray_AsString(PyObject *);
-PyAPI_FUNC(int) PyByteArray_Resize(PyObject *, Py_ssize_t);
-
-/* Macros, trading safety for speed */
-#define PyByteArray_AS_STRING(self) (assert(PyByteArray_Check(self)),((PyByteArrayObject *)(self))->ob_bytes)
-#define PyByteArray_GET_SIZE(self)  (assert(PyByteArray_Check(self)),Py_SIZE(self))
+    long ob_shash;
+    char ob_sval[1];
+
+    /* Invariants:
+     *     ob_sval contains space for 'ob_size+1' elements.
+     *     ob_sval[ob_size] == 0.
+     *     ob_shash is the hash of the string or -1 if not computed yet.
+     */
+} PyBytesObject;
+
+PyAPI_DATA(PyTypeObject) PyBytes_Type;
+PyAPI_DATA(PyTypeObject) PyBytesIter_Type;
+
+#define PyBytes_Check(op) \
+                 PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_BYTES_SUBCLASS)
+#define PyBytes_CheckExact(op) (Py_TYPE(op) == &PyBytes_Type)
+
+PyAPI_FUNC(PyObject *) PyBytes_FromStringAndSize(const char *, Py_ssize_t);
+PyAPI_FUNC(PyObject *) PyBytes_FromString(const char *);
+PyAPI_FUNC(PyObject *) PyBytes_FromFormatV(const char*, va_list)
+				Py_GCC_ATTRIBUTE((format(printf, 1, 0)));
+PyAPI_FUNC(PyObject *) PyBytes_FromFormat(const char*, ...)
+				Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
+PyAPI_FUNC(Py_ssize_t) PyBytes_Size(PyObject *);
+PyAPI_FUNC(char *) PyBytes_AsString(PyObject *);
+PyAPI_FUNC(PyObject *) PyBytes_Repr(PyObject *, int);
+PyAPI_FUNC(void) PyBytes_Concat(PyObject **, PyObject *);
+PyAPI_FUNC(void) PyBytes_ConcatAndDel(PyObject **, PyObject *);
+PyAPI_FUNC(int) _PyBytes_Resize(PyObject **, Py_ssize_t);
+PyAPI_FUNC(PyObject *) PyBytes_Format(PyObject *, PyObject *);
+PyAPI_FUNC(PyObject *) _PyBytes_FormatLong(PyObject*, int, int,
+						  int, char**, int*);
+PyAPI_FUNC(PyObject *) PyBytes_DecodeEscape(const char *, Py_ssize_t,
+						   const char *, Py_ssize_t,
+						   const char *);
+
+/* Macro, trading safety for speed */
+#define PyBytes_AS_STRING(op) (assert(PyBytes_Check(op)), \
+                                (((PyBytesObject *)(op))->ob_sval))
+#define PyBytes_GET_SIZE(op)  (assert(PyBytes_Check(op)),Py_SIZE(op))
+
+/* _PyBytes_Join(sep, x) is like sep.join(x).  sep must be PyBytesObject*,
+   x must be an iterable object. */
+PyAPI_FUNC(PyObject *) _PyBytes_Join(PyObject *sep, PyObject *x);
+
+/* Provides access to the internal data buffer and size of a string
+   object or the default encoded version of an Unicode object. Passing
+   NULL as *len parameter will force the string buffer to be
+   0-terminated (passing a string with embedded NULL characters will
+   cause an exception).  */
+PyAPI_FUNC(int) PyBytes_AsStringAndSize(
+    register PyObject *obj,	/* string or Unicode object */
+    register char **s,		/* pointer to buffer variable */
+    register Py_ssize_t *len	/* pointer to length variable or NULL
+				   (only possible for 0-terminated
+				   strings) */
+    );
+
+/* Using the current locale, insert the thousands grouping
+   into the string pointed to by buffer.  For the argument descriptions,
+   see Objects/stringlib/localeutil.h */
+
+PyAPI_FUNC(int) _PyBytes_InsertThousandsGrouping(char *buffer,
+						  Py_ssize_t len,
+						  char *plast,
+						  Py_ssize_t buf_size,
+						  Py_ssize_t *count,
+						  int append_zero_char);
+
+/* Flags used by string formatting */
+#define F_LJUST (1<<0)
+#define F_SIGN	(1<<1)
+#define F_BLANK (1<<2)
+#define F_ALT	(1<<3)
+#define F_ZERO	(1<<4)
 
 #ifdef __cplusplus
 }
 #endif
-#endif /* !Py_BYTESOBJECT_H */
+#endif /* !Py_STRINGOBJECT_H */
diff --git a/Include/stringobject.h b/Include/stringobject.h
deleted file mode 100644
index 1c73fde..0000000
--- a/Include/stringobject.h
+++ /dev/null
@@ -1,111 +0,0 @@
-
-/* String object interface */
-
-#ifndef Py_STRINGOBJECT_H
-#define Py_STRINGOBJECT_H
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include <stdarg.h>
-
-/*
-Type PyBytesObject represents a character string.  An extra zero byte is
-reserved at the end to ensure it is zero-terminated, but a size is
-present so strings with null bytes in them can be represented.  This
-is an immutable object type.
-
-There are functions to create new string objects, to test
-an object for string-ness, and to get the
-string value.  The latter function returns a null pointer
-if the object is not of the proper type.
-There is a variant that takes an explicit size as well as a
-variant that assumes a zero-terminated string.  Note that none of the
-functions should be applied to nil objects.
-*/
-
-/* Caching the hash (ob_shash) saves recalculation of a string's hash value.
-   This significantly speeds up dict lookups. */
-
-typedef struct {
-    PyObject_VAR_HEAD
-    long ob_shash;
-    char ob_sval[1];
-
-    /* Invariants:
-     *     ob_sval contains space for 'ob_size+1' elements.
-     *     ob_sval[ob_size] == 0.
-     *     ob_shash is the hash of the string or -1 if not computed yet.
-     */
-} PyBytesObject;
-
-PyAPI_DATA(PyTypeObject) PyBytes_Type;
-PyAPI_DATA(PyTypeObject) PyBytesIter_Type;
-
-#define PyBytes_Check(op) \
-                 PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_BYTES_SUBCLASS)
-#define PyBytes_CheckExact(op) (Py_TYPE(op) == &PyBytes_Type)
-
-PyAPI_FUNC(PyObject *) PyBytes_FromStringAndSize(const char *, Py_ssize_t);
-PyAPI_FUNC(PyObject *) PyBytes_FromString(const char *);
-PyAPI_FUNC(PyObject *) PyBytes_FromFormatV(const char*, va_list)
-				Py_GCC_ATTRIBUTE((format(printf, 1, 0)));
-PyAPI_FUNC(PyObject *) PyBytes_FromFormat(const char*, ...)
-				Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
-PyAPI_FUNC(Py_ssize_t) PyBytes_Size(PyObject *);
-PyAPI_FUNC(char *) PyBytes_AsString(PyObject *);
-PyAPI_FUNC(PyObject *) PyBytes_Repr(PyObject *, int);
-PyAPI_FUNC(void) PyBytes_Concat(PyObject **, PyObject *);
-PyAPI_FUNC(void) PyBytes_ConcatAndDel(PyObject **, PyObject *);
-PyAPI_FUNC(int) _PyBytes_Resize(PyObject **, Py_ssize_t);
-PyAPI_FUNC(PyObject *) PyBytes_Format(PyObject *, PyObject *);
-PyAPI_FUNC(PyObject *) _PyBytes_FormatLong(PyObject*, int, int,
-						  int, char**, int*);
-PyAPI_FUNC(PyObject *) PyBytes_DecodeEscape(const char *, Py_ssize_t,
-						   const char *, Py_ssize_t,
-						   const char *);
-
-/* Macro, trading safety for speed */
-#define PyBytes_AS_STRING(op) (assert(PyBytes_Check(op)), \
-                                (((PyBytesObject *)(op))->ob_sval))
-#define PyBytes_GET_SIZE(op)  (assert(PyBytes_Check(op)),Py_SIZE(op))
-
-/* _PyBytes_Join(sep, x) is like sep.join(x).  sep must be PyBytesObject*,
-   x must be an iterable object. */
-PyAPI_FUNC(PyObject *) _PyBytes_Join(PyObject *sep, PyObject *x);
-
-/* Provides access to the internal data buffer and size of a string
-   object or the default encoded version of an Unicode object. Passing
-   NULL as *len parameter will force the string buffer to be
-   0-terminated (passing a string with embedded NULL characters will
-   cause an exception).  */
-PyAPI_FUNC(int) PyBytes_AsStringAndSize(
-    register PyObject *obj,	/* string or Unicode object */
-    register char **s,		/* pointer to buffer variable */
-    register Py_ssize_t *len	/* pointer to length variable or NULL
-				   (only possible for 0-terminated
-				   strings) */
-    );
-
-/* Using the current locale, insert the thousands grouping
-   into the string pointed to by buffer.  For the argument descriptions,
-   see Objects/stringlib/localeutil.h */
-
-PyAPI_FUNC(int) _PyBytes_InsertThousandsGrouping(char *buffer,
-						  Py_ssize_t len,
-						  char *plast,
-						  Py_ssize_t buf_size,
-						  Py_ssize_t *count,
-						  int append_zero_char);
-
-/* Flags used by string formatting */
-#define F_LJUST (1<<0)
-#define F_SIGN	(1<<1)
-#define F_BLANK (1<<2)
-#define F_ALT	(1<<3)
-#define F_ZERO	(1<<4)
-
-#ifdef __cplusplus
-}
-#endif
-#endif /* !Py_STRINGOBJECT_H */
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 6f70bd5..16cd57a 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -299,6 +299,7 @@ OBJECT_OBJS=	\
 		Objects/abstract.o \
 		Objects/boolobject.o \
 		Objects/bytes_methods.o \
+		Objects/bytearrayobject.o \
 		Objects/bytesobject.o \
 		Objects/cellobject.o \
 		Objects/classobject.o \
@@ -325,7 +326,6 @@ OBJECT_OBJS=	\
 		Objects/rangeobject.o \
                 Objects/setobject.o \
 		Objects/sliceobject.o \
-		Objects/stringobject.o \
 		Objects/structseq.o \
 		Objects/tupleobject.o \
 		Objects/typeobject.o \
@@ -579,6 +579,7 @@ PYTHON_HEADERS= \
 		Include/bitset.h \
 		Include/boolobject.h \
 		Include/bytes_methods.h \
+		Include/bytearrayobject.h \
 		Include/bytesobject.h \
 		Include/cellobject.h \
 		Include/ceval.h \
@@ -636,7 +637,6 @@ PYTHON_HEADERS= \
 		Include/rangeobject.h \
 		Include/setobject.h \
 		Include/sliceobject.h \
-		Include/stringobject.h \
 		Include/structmember.h \
 		Include/structseq.h \
 		Include/symtable.h \
diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
new file mode 100644
index 0000000..0a83725
--- /dev/null
+++ b/Objects/bytearrayobject.c
@@ -0,0 +1,3300 @@
+/* PyByteArray (bytearray) implementation */
+
+#define PY_SSIZE_T_CLEAN
+#include "Python.h"
+#include "structmember.h"
+#include "bytes_methods.h"
+
+static PyByteArrayObject *nullbytes = NULL;
+
+void
+PyByteArray_Fini(void)
+{
+    Py_CLEAR(nullbytes);
+}
+
+int
+PyByteArray_Init(void)
+{
+    nullbytes = PyObject_New(PyByteArrayObject, &PyByteArray_Type);
+    if (nullbytes == NULL)
+        return 0;
+    nullbytes->ob_bytes = NULL;
+    Py_SIZE(nullbytes) = nullbytes->ob_alloc = 0;
+    nullbytes->ob_exports = 0;
+    return 1;
+}
+
+/* end nullbytes support */
+
+/* Helpers */
+
+static int
+_getbytevalue(PyObject* arg, int *value)
+{
+    long face_value;
+
+    if (PyLong_Check(arg)) {
+        face_value = PyLong_AsLong(arg);
+        if (face_value < 0 || face_value >= 256) {
+            PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
+            return 0;
+        }
+    } else {
+        PyErr_Format(PyExc_TypeError, "an integer is required");
+        return 0;
+    }
+
+    *value = face_value;
+    return 1;
+}
+
+static int
+bytes_getbuffer(PyByteArrayObject *obj, Py_buffer *view, int flags)
+{
+    int ret;
+    void *ptr;
+    if (view == NULL) {
+        obj->ob_exports++;
+        return 0;
+    }
+    if (obj->ob_bytes == NULL)
+        ptr = "";
+    else
+        ptr = obj->ob_bytes;
+    ret = PyBuffer_FillInfo(view, ptr, Py_SIZE(obj), 0, flags);
+    if (ret >= 0) {
+        obj->ob_exports++;
+    }
+    return ret;
+}
+
+static void
+bytes_releasebuffer(PyByteArrayObject *obj, Py_buffer *view)
+{
+    obj->ob_exports--;
+}
+
+static Py_ssize_t
+_getbuffer(PyObject *obj, Py_buffer *view)
+{
+    PyBufferProcs *buffer = Py_TYPE(obj)->tp_as_buffer;
+
+    if (buffer == NULL || buffer->bf_getbuffer == NULL)
+    {
+        PyErr_Format(PyExc_TypeError,
+                     "Type %.100s doesn't support the buffer API",
+                     Py_TYPE(obj)->tp_name);
+        return -1;
+    }
+
+    if (buffer->bf_getbuffer(obj, view, PyBUF_SIMPLE) < 0)
+            return -1;
+    return view->len;
+}
+
+/* Direct API functions */
+
+PyObject *
+PyByteArray_FromObject(PyObject *input)
+{
+    return PyObject_CallFunctionObjArgs((PyObject *)&PyByteArray_Type,
+                                        input, NULL);
+}
+
+PyObject *
+PyByteArray_FromStringAndSize(const char *bytes, Py_ssize_t size)
+{
+    PyByteArrayObject *new;
+    Py_ssize_t alloc;
+
+    if (size < 0) {
+        PyErr_SetString(PyExc_SystemError,
+            "Negative size passed to PyByteArray_FromStringAndSize");
+        return NULL;
+    }
+
+    new = PyObject_New(PyByteArrayObject, &PyByteArray_Type);
+    if (new == NULL)
+        return NULL;
+
+    if (size == 0) {
+        new->ob_bytes = NULL;
+        alloc = 0;
+    }
+    else {
+        alloc = size + 1;
+        new->ob_bytes = PyMem_Malloc(alloc);
+        if (new->ob_bytes == NULL) {
+            Py_DECREF(new);
+            return PyErr_NoMemory();
+        }
+        if (bytes != NULL)
+            memcpy(new->ob_bytes, bytes, size);
+        new->ob_bytes[size] = '\0';  /* Trailing null byte */
+    }
+    Py_SIZE(new) = size;
+    new->ob_alloc = alloc;
+    new->ob_exports = 0;
+
+    return (PyObject *)new;
+}
+
+Py_ssize_t
+PyByteArray_Size(PyObject *self)
+{
+    assert(self != NULL);
+    assert(PyByteArray_Check(self));
+
+    return PyByteArray_GET_SIZE(self);
+}
+
+char  *
+PyByteArray_AsString(PyObject *self)
+{
+    assert(self != NULL);
+    assert(PyByteArray_Check(self));
+
+    return PyByteArray_AS_STRING(self);
+}
+
+int
+PyByteArray_Resize(PyObject *self, Py_ssize_t size)
+{
+    void *sval;
+    Py_ssize_t alloc = ((PyByteArrayObject *)self)->ob_alloc;
+
+    assert(self != NULL);
+    assert(PyByteArray_Check(self));
+    assert(size >= 0);
+
+    if (size < alloc / 2) {
+        /* Major downsize; resize down to exact size */
+        alloc = size + 1;
+    }
+    else if (size < alloc) {
+        /* Within allocated size; quick exit */
+        Py_SIZE(self) = size;
+        ((PyByteArrayObject *)self)->ob_bytes[size] = '\0'; /* Trailing null */
+        return 0;
+    }
+    else if (size <= alloc * 1.125) {
+        /* Moderate upsize; overallocate similar to list_resize() */
+        alloc = size + (size >> 3) + (size < 9 ? 3 : 6);
+    }
+    else {
+        /* Major upsize; resize up to exact size */
+        alloc = size + 1;
+    }
+
+    if (((PyByteArrayObject *)self)->ob_exports > 0) {
+            /*
+            fprintf(stderr, "%d: %s", ((PyByteArrayObject *)self)->ob_exports,
+                    ((PyByteArrayObject *)self)->ob_bytes);
+            */
+            PyErr_SetString(PyExc_BufferError,
+                    "Existing exports of data: object cannot be re-sized");
+            return -1;
+    }
+
+    sval = PyMem_Realloc(((PyByteArrayObject *)self)->ob_bytes, alloc);
+    if (sval == NULL) {
+        PyErr_NoMemory();
+        return -1;
+    }
+
+    ((PyByteArrayObject *)self)->ob_bytes = sval;
+    Py_SIZE(self) = size;
+    ((PyByteArrayObject *)self)->ob_alloc = alloc;
+    ((PyByteArrayObject *)self)->ob_bytes[size] = '\0'; /* Trailing null byte */
+
+    return 0;
+}
+
+PyObject *
+PyByteArray_Concat(PyObject *a, PyObject *b)
+{
+    Py_ssize_t size;
+    Py_buffer va, vb;
+    PyByteArrayObject *result = NULL;
+
+    va.len = -1;
+    vb.len = -1;
+    if (_getbuffer(a, &va) < 0  ||
+        _getbuffer(b, &vb) < 0) {
+            PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
+                         Py_TYPE(a)->tp_name, Py_TYPE(b)->tp_name);
+            goto done;
+    }
+
+    size = va.len + vb.len;
+    if (size < 0) {
+            return PyErr_NoMemory();
+            goto done;
+    }
+
+    result = (PyByteArrayObject *) PyByteArray_FromStringAndSize(NULL, size);
+    if (result != NULL) {
+        memcpy(result->ob_bytes, va.buf, va.len);
+        memcpy(result->ob_bytes + va.len, vb.buf, vb.len);
+    }
+
+  done:
+    if (va.len != -1)
+        PyObject_ReleaseBuffer(a, &va);
+    if (vb.len != -1)
+        PyObject_ReleaseBuffer(b, &vb);
+    return (PyObject *)result;
+}
+
+/* Functions stuffed into the type object */
+
+static Py_ssize_t
+bytes_length(PyByteArrayObject *self)
+{
+    return Py_SIZE(self);
+}
+
+static PyObject *
+bytes_iconcat(PyByteArrayObject *self, PyObject *other)
+{
+    Py_ssize_t mysize;
+    Py_ssize_t size;
+    Py_buffer vo;
+
+    if (_getbuffer(other, &vo) < 0) {
+        PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
+                     Py_TYPE(other)->tp_name, Py_TYPE(self)->tp_name);
+        return NULL;
+    }
+
+    mysize = Py_SIZE(self);
+    size = mysize + vo.len;
+    if (size < 0) {
+        PyObject_ReleaseBuffer(other, &vo);
+        return PyErr_NoMemory();
+    }
+    if (size < self->ob_alloc) {
+        Py_SIZE(self) = size;
+        self->ob_bytes[Py_SIZE(self)] = '\0'; /* Trailing null byte */
+    }
+    else if (PyByteArray_Resize((PyObject *)self, size) < 0) {
+        PyObject_ReleaseBuffer(other, &vo);
+        return NULL;
+    }
+    memcpy(self->ob_bytes + mysize, vo.buf, vo.len);
+    PyObject_ReleaseBuffer(other, &vo);
+    Py_INCREF(self);
+    return (PyObject *)self;
+}
+
+static PyObject *
+bytes_repeat(PyByteArrayObject *self, Py_ssize_t count)
+{
+    PyByteArrayObject *result;
+    Py_ssize_t mysize;
+    Py_ssize_t size;
+
+    if (count < 0)
+        count = 0;
+    mysize = Py_SIZE(self);
+    size = mysize * count;
+    if (count != 0 && size / count != mysize)
+        return PyErr_NoMemory();
+    result = (PyByteArrayObject *)PyByteArray_FromStringAndSize(NULL, size);
+    if (result != NULL && size != 0) {
+        if (mysize == 1)
+            memset(result->ob_bytes, self->ob_bytes[0], size);
+        else {
+            Py_ssize_t i;
+            for (i = 0; i < count; i++)
+                memcpy(result->ob_bytes + i*mysize, self->ob_bytes, mysize);
+        }
+    }
+    return (PyObject *)result;
+}
+
+static PyObject *
+bytes_irepeat(PyByteArrayObject *self, Py_ssize_t count)
+{
+    Py_ssize_t mysize;
+    Py_ssize_t size;
+
+    if (count < 0)
+        count = 0;
+    mysize = Py_SIZE(self);
+    size = mysize * count;
+    if (count != 0 && size / count != mysize)
+        return PyErr_NoMemory();
+    if (size < self->ob_alloc) {
+        Py_SIZE(self) = size;
+        self->ob_bytes[Py_SIZE(self)] = '\0'; /* Trailing null byte */
+    }
+    else if (PyByteArray_Resize((PyObject *)self, size) < 0)
+        return NULL;
+
+    if (mysize == 1)
+        memset(self->ob_bytes, self->ob_bytes[0], size);
+    else {
+        Py_ssize_t i;
+        for (i = 1; i < count; i++)
+            memcpy(self->ob_bytes + i*mysize, self->ob_bytes, mysize);
+    }
+
+    Py_INCREF(self);
+    return (PyObject *)self;
+}
+
+static PyObject *
+bytes_getitem(PyByteArrayObject *self, Py_ssize_t i)
+{
+    if (i < 0)
+        i += Py_SIZE(self);
+    if (i < 0 || i >= Py_SIZE(self)) {
+        PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
+        return NULL;
+    }
+    return PyLong_FromLong((unsigned char)(self->ob_bytes[i]));
+}
+
+static PyObject *
+bytes_subscript(PyByteArrayObject *self, PyObject *item)
+{
+    if (PyIndex_Check(item)) {
+        Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
+
+        if (i == -1 && PyErr_Occurred())
+            return NULL;
+
+        if (i < 0)
+            i += PyByteArray_GET_SIZE(self);
+
+        if (i < 0 || i >= Py_SIZE(self)) {
+            PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
+            return NULL;
+        }
+        return PyLong_FromLong((unsigned char)(self->ob_bytes[i]));
+    }
+    else if (PySlice_Check(item)) {
+        Py_ssize_t start, stop, step, slicelength, cur, i;
+        if (PySlice_GetIndicesEx((PySliceObject *)item,
+                                 PyByteArray_GET_SIZE(self),
+                                 &start, &stop, &step, &slicelength) < 0) {
+            return NULL;
+        }
+
+        if (slicelength <= 0)
+            return PyByteArray_FromStringAndSize("", 0);
+        else if (step == 1) {
+            return PyByteArray_FromStringAndSize(self->ob_bytes + start,
+                                             slicelength);
+        }
+        else {
+            char *source_buf = PyByteArray_AS_STRING(self);
+            char *result_buf = (char *)PyMem_Malloc(slicelength);
+            PyObject *result;
+
+            if (result_buf == NULL)
+                return PyErr_NoMemory();
+
+            for (cur = start, i = 0; i < slicelength;
+                 cur += step, i++) {
+                     result_buf[i] = source_buf[cur];
+            }
+            result = PyByteArray_FromStringAndSize(result_buf, slicelength);
+            PyMem_Free(result_buf);
+            return result;
+        }
+    }
+    else {
+        PyErr_SetString(PyExc_TypeError, "bytearray indices must be integers");
+        return NULL;
+    }
+}
+
+static int
+bytes_setslice(PyByteArrayObject *self, Py_ssize_t lo, Py_ssize_t hi,
+               PyObject *values)
+{
+    Py_ssize_t avail, needed;
+    void *bytes;
+    Py_buffer vbytes;
+    int res = 0;
+
+    vbytes.len = -1;
+    if (values == (PyObject *)self) {
+        /* Make a copy and call this function recursively */
+        int err;
+        values = PyByteArray_FromObject(values);
+        if (values == NULL)
+            return -1;
+        err = bytes_setslice(self, lo, hi, values);
+        Py_DECREF(values);
+        return err;
+    }
+    if (values == NULL) {
+        /* del b[lo:hi] */
+        bytes = NULL;
+        needed = 0;
+    }
+    else {
+            if (_getbuffer(values, &vbytes) < 0) {
+                    PyErr_Format(PyExc_TypeError,
+                                 "can't set bytes slice from %.100s",
+                                 Py_TYPE(values)->tp_name);
+                    return -1;
+            }
+            needed = vbytes.len;
+            bytes = vbytes.buf;
+    }
+
+    if (lo < 0)
+        lo = 0;
+    if (hi < lo)
+        hi = lo;
+    if (hi > Py_SIZE(self))
+        hi = Py_SIZE(self);
+
+    avail = hi - lo;
+    if (avail < 0)
+        lo = hi = avail = 0;
+
+    if (avail != needed) {
+        if (avail > needed) {
+            /*
+              0   lo               hi               old_size
+              |   |<----avail----->|<-----tomove------>|
+              |   |<-needed->|<-----tomove------>|
+              0   lo      new_hi              new_size
+            */
+            memmove(self->ob_bytes + lo + needed, self->ob_bytes + hi,
+                    Py_SIZE(self) - hi);
+        }
+        /* XXX(nnorwitz): need to verify this can't overflow! */
+        if (PyByteArray_Resize((PyObject *)self,
+                           Py_SIZE(self) + needed - avail) < 0) {
+                res = -1;
+                goto finish;
+        }
+        if (avail < needed) {
+            /*
+              0   lo        hi               old_size
+              |   |<-avail->|<-----tomove------>|
+              |   |<----needed---->|<-----tomove------>|
+              0   lo            new_hi              new_size
+             */
+            memmove(self->ob_bytes + lo + needed, self->ob_bytes + hi,
+                    Py_SIZE(self) - lo - needed);
+        }
+    }
+
+    if (needed > 0)
+        memcpy(self->ob_bytes + lo, bytes, needed);
+
+
+ finish:
+    if (vbytes.len != -1)
+            PyObject_ReleaseBuffer(values, &vbytes);
+    return res;
+}
+
+static int
+bytes_setitem(PyByteArrayObject *self, Py_ssize_t i, PyObject *value)
+{
+    Py_ssize_t ival;
+
+    if (i < 0)
+        i += Py_SIZE(self);
+
+    if (i < 0 || i >= Py_SIZE(self)) {
+        PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
+        return -1;
+    }
+
+    if (value == NULL)
+        return bytes_setslice(self, i, i+1, NULL);
+
+    ival = PyNumber_AsSsize_t(value, PyExc_ValueError);
+    if (ival == -1 && PyErr_Occurred())
+        return -1;
+
+    if (ival < 0 || ival >= 256) {
+        PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
+        return -1;
+    }
+
+    self->ob_bytes[i] = ival;
+    return 0;
+}
+
+static int
+bytes_ass_subscript(PyByteArrayObject *self, PyObject *item, PyObject *values)
+{
+    Py_ssize_t start, stop, step, slicelen, needed;
+    char *bytes;
+
+    if (PyIndex_Check(item)) {
+        Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
+
+        if (i == -1 && PyErr_Occurred())
+            return -1;
+
+        if (i < 0)
+            i += PyByteArray_GET_SIZE(self);
+
+        if (i < 0 || i >= Py_SIZE(self)) {
+            PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
+            return -1;
+        }
+
+        if (values == NULL) {
+            /* Fall through to slice assignment */
+            start = i;
+            stop = i + 1;
+            step = 1;
+            slicelen = 1;
+        }
+        else {
+            Py_ssize_t ival = PyNumber_AsSsize_t(values, PyExc_ValueError);
+            if (ival == -1 && PyErr_Occurred())
+                return -1;
+            if (ival < 0 || ival >= 256) {
+                PyErr_SetString(PyExc_ValueError,
+                                "byte must be in range(0, 256)");
+                return -1;
+            }
+            self->ob_bytes[i] = (char)ival;
+            return 0;
+        }
+    }
+    else if (PySlice_Check(item)) {
+        if (PySlice_GetIndicesEx((PySliceObject *)item,
+                                 PyByteArray_GET_SIZE(self),
+                                 &start, &stop, &step, &slicelen) < 0) {
+            return -1;
+        }
+    }
+    else {
+        PyErr_SetString(PyExc_TypeError, "bytearray indices must be integer");
+        return -1;
+    }
+
+    if (values == NULL) {
+        bytes = NULL;
+        needed = 0;
+    }
+    else if (values == (PyObject *)self || !PyByteArray_Check(values)) {
+        /* Make a copy an call this function recursively */
+        int err;
+        values = PyByteArray_FromObject(values);
+        if (values == NULL)
+            return -1;
+        err = bytes_ass_subscript(self, item, values);
+        Py_DECREF(values);
+        return err;
+    }
+    else {
+        assert(PyByteArray_Check(values));
+        bytes = ((PyByteArrayObject *)values)->ob_bytes;
+        needed = Py_SIZE(values);
+    }
+    /* Make sure b[5:2] = ... inserts before 5, not before 2. */
+    if ((step < 0 && start < stop) ||
+        (step > 0 && start > stop))
+        stop = start;
+    if (step == 1) {
+        if (slicelen != needed) {
+            if (slicelen > needed) {
+                /*
+                  0   start           stop              old_size
+                  |   |<---slicelen--->|<-----tomove------>|
+                  |   |<-needed->|<-----tomove------>|
+                  0   lo      new_hi              new_size
+                */
+                memmove(self->ob_bytes + start + needed, self->ob_bytes + stop,
+                        Py_SIZE(self) - stop);
+            }
+            if (PyByteArray_Resize((PyObject *)self,
+                               Py_SIZE(self) + needed - slicelen) < 0)
+                return -1;
+            if (slicelen < needed) {
+                /*
+                  0   lo        hi               old_size
+                  |   |<-avail->|<-----tomove------>|
+                  |   |<----needed---->|<-----tomove------>|
+                  0   lo            new_hi              new_size
+                 */
+                memmove(self->ob_bytes + start + needed, self->ob_bytes + stop,
+                        Py_SIZE(self) - start - needed);
+            }
+        }
+
+        if (needed > 0)
+            memcpy(self->ob_bytes + start, bytes, needed);
+
+        return 0;
+    }
+    else {
+        if (needed == 0) {
+            /* Delete slice */
+            Py_ssize_t cur, i;
+
+            if (step < 0) {
+                stop = start + 1;
+                start = stop + step * (slicelen - 1) - 1;
+                step = -step;
+            }
+            for (cur = start, i = 0;
+                 i < slicelen; cur += step, i++) {
+                Py_ssize_t lim = step - 1;
+
+                if (cur + step >= PyByteArray_GET_SIZE(self))
+                    lim = PyByteArray_GET_SIZE(self) - cur - 1;
+
+                memmove(self->ob_bytes + cur - i,
+                        self->ob_bytes + cur + 1, lim);
+            }
+            /* Move the tail of the bytes, in one chunk */
+            cur = start + slicelen*step;
+            if (cur < PyByteArray_GET_SIZE(self)) {
+                memmove(self->ob_bytes + cur - slicelen,
+                        self->ob_bytes + cur,
+                        PyByteArray_GET_SIZE(self) - cur);
+            }
+            if (PyByteArray_Resize((PyObject *)self,
+                               PyByteArray_GET_SIZE(self) - slicelen) < 0)
+                return -1;
+
+            return 0;
+        }
+        else {
+            /* Assign slice */
+            Py_ssize_t cur, i;
+
+            if (needed != slicelen) {
+                PyErr_Format(PyExc_ValueError,
+                             "attempt to assign bytes of size %zd "
+                             "to extended slice of size %zd",
+                             needed, slicelen);
+                return -1;
+            }
+            for (cur = start, i = 0; i < slicelen; cur += step, i++)
+                self->ob_bytes[cur] = bytes[i];
+            return 0;
+        }
+    }
+}
+
+static int
+bytes_init(PyByteArrayObject *self, PyObject *args, PyObject *kwds)
+{
+    static char *kwlist[] = {"source", "encoding", "errors", 0};
+    PyObject *arg = NULL;
+    const char *encoding = NULL;
+    const char *errors = NULL;
+    Py_ssize_t count;
+    PyObject *it;
+    PyObject *(*iternext)(PyObject *);
+
+    if (Py_SIZE(self) != 0) {
+        /* Empty previous contents (yes, do this first of all!) */
+        if (PyByteArray_Resize((PyObject *)self, 0) < 0)
+            return -1;
+    }
+
+    /* Parse arguments */
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|Oss:bytes", kwlist,
+                                     &arg, &encoding, &errors))
+        return -1;
+
+    /* Make a quick exit if no first argument */
+    if (arg == NULL) {
+        if (encoding != NULL || errors != NULL) {
+            PyErr_SetString(PyExc_TypeError,
+                            "encoding or errors without sequence argument");
+            return -1;
+        }
+        return 0;
+    }
+
+    if (PyUnicode_Check(arg)) {
+        /* Encode via the codec registry */
+        PyObject *encoded, *new;
+        if (encoding == NULL) {
+            PyErr_SetString(PyExc_TypeError,
+                            "string argument without an encoding");
+            return -1;
+        }
+        encoded = PyCodec_Encode(arg, encoding, errors);
+        if (encoded == NULL)
+            return -1;
+        assert(PyBytes_Check(encoded));
+        new = bytes_iconcat(self, encoded);
+        Py_DECREF(encoded);
+        if (new == NULL)
+            return -1;
+        Py_DECREF(new);
+        return 0;
+    }
+
+    /* If it's not unicode, there can't be encoding or errors */
+    if (encoding != NULL || errors != NULL) {
+        PyErr_SetString(PyExc_TypeError,
+                        "encoding or errors without a string argument");
+        return -1;
+    }
+
+    /* Is it an int? */
+    count = PyNumber_AsSsize_t(arg, PyExc_ValueError);
+    if (count == -1 && PyErr_Occurred())
+        PyErr_Clear();
+    else {
+        if (count < 0) {
+            PyErr_SetString(PyExc_ValueError, "negative count");
+            return -1;
+        }
+        if (count > 0) {
+            if (PyByteArray_Resize((PyObject *)self, count))
+                return -1;
+            memset(self->ob_bytes, 0, count);
+        }
+        return 0;
+    }
+
+    /* Use the buffer API */
+    if (PyObject_CheckBuffer(arg)) {
+        Py_ssize_t size;
+        Py_buffer view;
+        if (PyObject_GetBuffer(arg, &view, PyBUF_FULL_RO) < 0)
+            return -1;
+        size = view.len;
+        if (PyByteArray_Resize((PyObject *)self, size) < 0) goto fail;
+        if (PyBuffer_ToContiguous(self->ob_bytes, &view, size, 'C') < 0)
+                goto fail;
+        PyObject_ReleaseBuffer(arg, &view);
+        return 0;
+    fail:
+        PyObject_ReleaseBuffer(arg, &view);
+        return -1;
+    }
+
+    /* XXX Optimize this if the arguments is a list, tuple */
+
+    /* Get the iterator */
+    it = PyObject_GetIter(arg);
+    if (it == NULL)
+        return -1;
+    iternext = *Py_TYPE(it)->tp_iternext;
+
+    /* Run the iterator to exhaustion */
+    for (;;) {
+        PyObject *item;
+        Py_ssize_t value;
+
+        /* Get the next item */
+        item = iternext(it);
+        if (item == NULL) {
+            if (PyErr_Occurred()) {
+                if (!PyErr_ExceptionMatches(PyExc_StopIteration))
+                    goto error;
+                PyErr_Clear();
+            }
+            break;
+        }
+
+        /* Interpret it as an int (__index__) */
+        value = PyNumber_AsSsize_t(item, PyExc_ValueError);
+        Py_DECREF(item);
+        if (value == -1 && PyErr_Occurred())
+            goto error;
+
+        /* Range check */
+        if (value < 0 || value >= 256) {
+            PyErr_SetString(PyExc_ValueError,
+                            "bytes must be in range(0, 256)");
+            goto error;
+        }
+
+        /* Append the byte */
+        if (Py_SIZE(self) < self->ob_alloc)
+            Py_SIZE(self)++;
+        else if (PyByteArray_Resize((PyObject *)self, Py_SIZE(self)+1) < 0)
+            goto error;
+        self->ob_bytes[Py_SIZE(self)-1] = value;
+    }
+
+    /* Clean up and return success */
+    Py_DECREF(it);
+    return 0;
+
+ error:
+    /* Error handling when it != NULL */
+    Py_DECREF(it);
+    return -1;
+}
+
+/* Mostly copied from string_repr, but without the
+   "smart quote" functionality. */
+static PyObject *
+bytes_repr(PyByteArrayObject *self)
+{
+    static const char *hexdigits = "0123456789abcdef";
+    const char *quote_prefix = "bytearray(b";
+    const char *quote_postfix = ")";
+    Py_ssize_t length = Py_SIZE(self);
+    /* 14 == strlen(quote_prefix) + 2 + strlen(quote_postfix) */
+    size_t newsize = 14 + 4 * length;
+    PyObject *v;
+    if (newsize > PY_SSIZE_T_MAX || newsize / 4 - 3 != length) {
+        PyErr_SetString(PyExc_OverflowError,
+            "bytearray object is too large to make repr");
+        return NULL;
+    }
+    v = PyUnicode_FromUnicode(NULL, newsize);
+    if (v == NULL) {
+        return NULL;
+    }
+    else {
+        register Py_ssize_t i;
+        register Py_UNICODE c;
+        register Py_UNICODE *p;
+        int quote;
+
+        /* Figure out which quote to use; single is preferred */
+        quote = '\'';
+        {
+            char *test, *start;
+            start = PyByteArray_AS_STRING(self);
+            for (test = start; test < start+length; ++test) {
+                if (*test == '"') {
+                    quote = '\''; /* back to single */
+                    goto decided;
+                }
+                else if (*test == '\'')
+                    quote = '"';
+            }
+          decided:
+            ;
+        }
+
+        p = PyUnicode_AS_UNICODE(v);
+        while (*quote_prefix)
+            *p++ = *quote_prefix++;
+        *p++ = quote;
+
+        for (i = 0; i < length; i++) {
+            /* There's at least enough room for a hex escape
+               and a closing quote. */
+            assert(newsize - (p - PyUnicode_AS_UNICODE(v)) >= 5);
+            c = self->ob_bytes[i];
+            if (c == '\'' || c == '\\')
+                *p++ = '\\', *p++ = c;
+            else if (c == '\t')
+                *p++ = '\\', *p++ = 't';
+            else if (c == '\n')
+                *p++ = '\\', *p++ = 'n';
+            else if (c == '\r')
+                *p++ = '\\', *p++ = 'r';
+            else if (c == 0)
+                *p++ = '\\', *p++ = 'x', *p++ = '0', *p++ = '0';
+            else if (c < ' ' || c >= 0x7f) {
+                *p++ = '\\';
+                *p++ = 'x';
+                *p++ = hexdigits[(c & 0xf0) >> 4];
+                *p++ = hexdigits[c & 0xf];
+            }
+            else
+                *p++ = c;
+        }
+        assert(newsize - (p - PyUnicode_AS_UNICODE(v)) >= 1);
+        *p++ = quote;
+        while (*quote_postfix) {
+           *p++ = *quote_postfix++;
+        }
+        *p = '\0';
+        if (PyUnicode_Resize(&v, (p - PyUnicode_AS_UNICODE(v)))) {
+            Py_DECREF(v);
+            return NULL;
+        }
+        return v;
+    }
+}
+
+static PyObject *
+bytes_str(PyObject *op)
+{
+	if (Py_BytesWarningFlag) {
+		if (PyErr_WarnEx(PyExc_BytesWarning,
+				 "str() on a bytearray instance", 1))
+			return NULL;
+	}
+	return bytes_repr((PyByteArrayObject*)op);
+}
+
+static PyObject *
+bytes_richcompare(PyObject *self, PyObject *other, int op)
+{
+    Py_ssize_t self_size, other_size;
+    Py_buffer self_bytes, other_bytes;
+    PyObject *res;
+    Py_ssize_t minsize;
+    int cmp;
+
+    /* Bytes can be compared to anything that supports the (binary)
+       buffer API.  Except that a comparison with Unicode is always an
+       error, even if the comparison is for equality. */
+    if (PyObject_IsInstance(self, (PyObject*)&PyUnicode_Type) ||
+        PyObject_IsInstance(other, (PyObject*)&PyUnicode_Type)) {
+        if (Py_BytesWarningFlag && op == Py_EQ) {
+            if (PyErr_WarnEx(PyExc_BytesWarning,
+                            "Comparsion between bytearray and string", 1))
+                return NULL;
+        }
+
+        Py_INCREF(Py_NotImplemented);
+        return Py_NotImplemented;
+    }
+
+    self_size = _getbuffer(self, &self_bytes);
+    if (self_size < 0) {
+        PyErr_Clear();
+        Py_INCREF(Py_NotImplemented);
+        return Py_NotImplemented;
+    }
+
+    other_size = _getbuffer(other, &other_bytes);
+    if (other_size < 0) {
+        PyErr_Clear();
+        PyObject_ReleaseBuffer(self, &self_bytes);
+        Py_INCREF(Py_NotImplemented);
+        return Py_NotImplemented;
+    }
+
+    if (self_size != other_size && (op == Py_EQ || op == Py_NE)) {
+        /* Shortcut: if the lengths differ, the objects differ */
+        cmp = (op == Py_NE);
+    }
+    else {
+        minsize = self_size;
+        if (other_size < minsize)
+            minsize = other_size;
+
+        cmp = memcmp(self_bytes.buf, other_bytes.buf, minsize);
+        /* In ISO C, memcmp() guarantees to use unsigned bytes! */
+
+        if (cmp == 0) {
+            if (self_size < other_size)
+                cmp = -1;
+            else if (self_size > other_size)
+                cmp = 1;
+        }
+
+        switch (op) {
+        case Py_LT: cmp = cmp <  0; break;
+        case Py_LE: cmp = cmp <= 0; break;
+        case Py_EQ: cmp = cmp == 0; break;
+        case Py_NE: cmp = cmp != 0; break;
+        case Py_GT: cmp = cmp >  0; break;
+        case Py_GE: cmp = cmp >= 0; break;
+        }
+    }
+
+    res = cmp ? Py_True : Py_False;
+    PyObject_ReleaseBuffer(self, &self_bytes);
+    PyObject_ReleaseBuffer(other, &other_bytes);
+    Py_INCREF(res);
+    return res;
+}
+
+static void
+bytes_dealloc(PyByteArrayObject *self)
+{
+    if (self->ob_bytes != 0) {
+        PyMem_Free(self->ob_bytes);
+    }
+    Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+
+/* -------------------------------------------------------------------- */
+/* Methods */
+
+#define STRINGLIB_CHAR char
+#define STRINGLIB_CMP memcmp
+#define STRINGLIB_LEN PyByteArray_GET_SIZE
+#define STRINGLIB_STR PyByteArray_AS_STRING
+#define STRINGLIB_NEW PyByteArray_FromStringAndSize
+#define STRINGLIB_EMPTY nullbytes
+#define STRINGLIB_CHECK_EXACT PyByteArray_CheckExact
+#define STRINGLIB_MUTABLE 1
+
+#include "stringlib/fastsearch.h"
+#include "stringlib/count.h"
+#include "stringlib/find.h"
+#include "stringlib/partition.h"
+#include "stringlib/ctype.h"
+#include "stringlib/transmogrify.h"
+
+
+/* The following Py_LOCAL_INLINE and Py_LOCAL functions
+were copied from the old char* style string object. */
+
+Py_LOCAL_INLINE(void)
+_adjust_indices(Py_ssize_t *start, Py_ssize_t *end, Py_ssize_t len)
+{
+    if (*end > len)
+        *end = len;
+    else if (*end < 0)
+        *end += len;
+    if (*end < 0)
+        *end = 0;
+    if (*start < 0)
+        *start += len;
+    if (*start < 0)
+        *start = 0;
+}
+
+
+Py_LOCAL_INLINE(Py_ssize_t)
+bytes_find_internal(PyByteArrayObject *self, PyObject *args, int dir)
+{
+    PyObject *subobj;
+    Py_buffer subbuf;
+    Py_ssize_t start=0, end=PY_SSIZE_T_MAX;
+    Py_ssize_t res;
+
+    if (!PyArg_ParseTuple(args, "O|O&O&:find/rfind/index/rindex", &subobj,
+        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+        return -2;
+    if (_getbuffer(subobj, &subbuf) < 0)
+        return -2;
+    if (dir > 0)
+        res = stringlib_find_slice(
+            PyByteArray_AS_STRING(self), PyByteArray_GET_SIZE(self),
+            subbuf.buf, subbuf.len, start, end);
+    else
+        res = stringlib_rfind_slice(
+            PyByteArray_AS_STRING(self), PyByteArray_GET_SIZE(self),
+            subbuf.buf, subbuf.len, start, end);
+    PyObject_ReleaseBuffer(subobj, &subbuf);
+    return res;
+}
+
+PyDoc_STRVAR(find__doc__,
+"B.find(sub [,start [,end]]) -> int\n\
+\n\
+Return the lowest index in B where subsection sub is found,\n\
+such that sub is contained within s[start,end].  Optional\n\
+arguments start and end are interpreted as in slice notation.\n\
+\n\
+Return -1 on failure.");
+
+static PyObject *
+bytes_find(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t result = bytes_find_internal(self, args, +1);
+    if (result == -2)
+        return NULL;
+    return PyLong_FromSsize_t(result);
+}
+
+PyDoc_STRVAR(count__doc__,
+"B.count(sub [,start [,end]]) -> int\n\
+\n\
+Return the number of non-overlapping occurrences of subsection sub in\n\
+bytes B[start:end].  Optional arguments start and end are interpreted\n\
+as in slice notation.");
+
+static PyObject *
+bytes_count(PyByteArrayObject *self, PyObject *args)
+{
+    PyObject *sub_obj;
+    const char *str = PyByteArray_AS_STRING(self);
+    Py_ssize_t start = 0, end = PY_SSIZE_T_MAX;
+    Py_buffer vsub;
+    PyObject *count_obj;
+
+    if (!PyArg_ParseTuple(args, "O|O&O&:count", &sub_obj,
+        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+        return NULL;
+
+    if (_getbuffer(sub_obj, &vsub) < 0)
+        return NULL;
+
+    _adjust_indices(&start, &end, PyByteArray_GET_SIZE(self));
+
+    count_obj = PyLong_FromSsize_t(
+        stringlib_count(str + start, end - start, vsub.buf, vsub.len)
+        );
+    PyObject_ReleaseBuffer(sub_obj, &vsub);
+    return count_obj;
+}
+
+
+PyDoc_STRVAR(index__doc__,
+"B.index(sub [,start [,end]]) -> int\n\
+\n\
+Like B.find() but raise ValueError when the subsection is not found.");
+
+static PyObject *
+bytes_index(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t result = bytes_find_internal(self, args, +1);
+    if (result == -2)
+        return NULL;
+    if (result == -1) {
+        PyErr_SetString(PyExc_ValueError,
+                        "subsection not found");
+        return NULL;
+    }
+    return PyLong_FromSsize_t(result);
+}
+
+
+PyDoc_STRVAR(rfind__doc__,
+"B.rfind(sub [,start [,end]]) -> int\n\
+\n\
+Return the highest index in B where subsection sub is found,\n\
+such that sub is contained within s[start,end].  Optional\n\
+arguments start and end are interpreted as in slice notation.\n\
+\n\
+Return -1 on failure.");
+
+static PyObject *
+bytes_rfind(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t result = bytes_find_internal(self, args, -1);
+    if (result == -2)
+        return NULL;
+    return PyLong_FromSsize_t(result);
+}
+
+
+PyDoc_STRVAR(rindex__doc__,
+"B.rindex(sub [,start [,end]]) -> int\n\
+\n\
+Like B.rfind() but raise ValueError when the subsection is not found.");
+
+static PyObject *
+bytes_rindex(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t result = bytes_find_internal(self, args, -1);
+    if (result == -2)
+        return NULL;
+    if (result == -1) {
+        PyErr_SetString(PyExc_ValueError,
+                        "subsection not found");
+        return NULL;
+    }
+    return PyLong_FromSsize_t(result);
+}
+
+
+static int
+bytes_contains(PyObject *self, PyObject *arg)
+{
+    Py_ssize_t ival = PyNumber_AsSsize_t(arg, PyExc_ValueError);
+    if (ival == -1 && PyErr_Occurred()) {
+        Py_buffer varg;
+        int pos;
+        PyErr_Clear();
+        if (_getbuffer(arg, &varg) < 0)
+            return -1;
+        pos = stringlib_find(PyByteArray_AS_STRING(self), Py_SIZE(self),
+                             varg.buf, varg.len, 0);
+        PyObject_ReleaseBuffer(arg, &varg);
+        return pos >= 0;
+    }
+    if (ival < 0 || ival >= 256) {
+        PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
+        return -1;
+    }
+
+    return memchr(PyByteArray_AS_STRING(self), ival, Py_SIZE(self)) != NULL;
+}
+
+
+/* Matches the end (direction >= 0) or start (direction < 0) of self
+ * against substr, using the start and end arguments. Returns
+ * -1 on error, 0 if not found and 1 if found.
+ */
+Py_LOCAL(int)
+_bytes_tailmatch(PyByteArrayObject *self, PyObject *substr, Py_ssize_t start,
+                 Py_ssize_t end, int direction)
+{
+    Py_ssize_t len = PyByteArray_GET_SIZE(self);
+    const char* str;
+    Py_buffer vsubstr;
+    int rv = 0;
+
+    str = PyByteArray_AS_STRING(self);
+
+    if (_getbuffer(substr, &vsubstr) < 0)
+        return -1;
+
+    _adjust_indices(&start, &end, len);
+
+    if (direction < 0) {
+        /* startswith */
+        if (start+vsubstr.len > len) {
+            goto done;
+        }
+    } else {
+        /* endswith */
+        if (end-start < vsubstr.len || start > len) {
+            goto done;
+        }
+
+        if (end-vsubstr.len > start)
+            start = end - vsubstr.len;
+    }
+    if (end-start >= vsubstr.len)
+        rv = ! memcmp(str+start, vsubstr.buf, vsubstr.len);
+
+done:
+    PyObject_ReleaseBuffer(substr, &vsubstr);
+    return rv;
+}
+
+
+PyDoc_STRVAR(startswith__doc__,
+"B.startswith(prefix [,start [,end]]) -> bool\n\
+\n\
+Return True if B starts with the specified prefix, False otherwise.\n\
+With optional start, test B beginning at that position.\n\
+With optional end, stop comparing B at that position.\n\
+prefix can also be a tuple of strings to try.");
+
+static PyObject *
+bytes_startswith(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t start = 0;
+    Py_ssize_t end = PY_SSIZE_T_MAX;
+    PyObject *subobj;
+    int result;
+
+    if (!PyArg_ParseTuple(args, "O|O&O&:startswith", &subobj,
+        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+        return NULL;
+    if (PyTuple_Check(subobj)) {
+        Py_ssize_t i;
+        for (i = 0; i < PyTuple_GET_SIZE(subobj); i++) {
+            result = _bytes_tailmatch(self,
+                                      PyTuple_GET_ITEM(subobj, i),
+                                      start, end, -1);
+            if (result == -1)
+                return NULL;
+            else if (result) {
+                Py_RETURN_TRUE;
+            }
+        }
+        Py_RETURN_FALSE;
+    }
+    result = _bytes_tailmatch(self, subobj, start, end, -1);
+    if (result == -1)
+        return NULL;
+    else
+        return PyBool_FromLong(result);
+}
+
+PyDoc_STRVAR(endswith__doc__,
+"B.endswith(suffix [,start [,end]]) -> bool\n\
+\n\
+Return True if B ends with the specified suffix, False otherwise.\n\
+With optional start, test B beginning at that position.\n\
+With optional end, stop comparing B at that position.\n\
+suffix can also be a tuple of strings to try.");
+
+static PyObject *
+bytes_endswith(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t start = 0;
+    Py_ssize_t end = PY_SSIZE_T_MAX;
+    PyObject *subobj;
+    int result;
+
+    if (!PyArg_ParseTuple(args, "O|O&O&:endswith", &subobj,
+        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+        return NULL;
+    if (PyTuple_Check(subobj)) {
+        Py_ssize_t i;
+        for (i = 0; i < PyTuple_GET_SIZE(subobj); i++) {
+            result = _bytes_tailmatch(self,
+                                      PyTuple_GET_ITEM(subobj, i),
+                                      start, end, +1);
+            if (result == -1)
+                return NULL;
+            else if (result) {
+                Py_RETURN_TRUE;
+            }
+        }
+        Py_RETURN_FALSE;
+    }
+    result = _bytes_tailmatch(self, subobj, start, end, +1);
+    if (result == -1)
+        return NULL;
+    else
+        return PyBool_FromLong(result);
+}
+
+
+PyDoc_STRVAR(translate__doc__,
+"B.translate(table[, deletechars]) -> bytearray\n\
+\n\
+Return a copy of B, where all characters occurring in the\n\
+optional argument deletechars are removed, and the remaining\n\
+characters have been mapped through the given translation\n\
+table, which must be a bytes object of length 256.");
+
+static PyObject *
+bytes_translate(PyByteArrayObject *self, PyObject *args)
+{
+    register char *input, *output;
+    register const char *table;
+    register Py_ssize_t i, c, changed = 0;
+    PyObject *input_obj = (PyObject*)self;
+    const char *output_start;
+    Py_ssize_t inlen;
+    PyObject *result;
+    int trans_table[256];
+    PyObject *tableobj, *delobj = NULL;
+    Py_buffer vtable, vdel;
+
+    if (!PyArg_UnpackTuple(args, "translate", 1, 2,
+                           &tableobj, &delobj))
+          return NULL;
+
+    if (_getbuffer(tableobj, &vtable) < 0)
+        return NULL;
+
+    if (vtable.len != 256) {
+        PyErr_SetString(PyExc_ValueError,
+                        "translation table must be 256 characters long");
+        result = NULL;
+        goto done;
+    }
+
+    if (delobj != NULL) {
+        if (_getbuffer(delobj, &vdel) < 0) {
+            result = NULL;
+            goto done;
+        }
+    }
+    else {
+        vdel.buf = NULL;
+        vdel.len = 0;
+    }
+
+    table = (const char *)vtable.buf;
+    inlen = PyByteArray_GET_SIZE(input_obj);
+    result = PyByteArray_FromStringAndSize((char *)NULL, inlen);
+    if (result == NULL)
+        goto done;
+    output_start = output = PyByteArray_AsString(result);
+    input = PyByteArray_AS_STRING(input_obj);
+
+    if (vdel.len == 0) {
+        /* If no deletions are required, use faster code */
+        for (i = inlen; --i >= 0; ) {
+            c = Py_CHARMASK(*input++);
+            if (Py_CHARMASK((*output++ = table[c])) != c)
+                changed = 1;
+        }
+        if (changed || !PyByteArray_CheckExact(input_obj))
+            goto done;
+        Py_DECREF(result);
+        Py_INCREF(input_obj);
+        result = input_obj;
+        goto done;
+    }
+
+    for (i = 0; i < 256; i++)
+        trans_table[i] = Py_CHARMASK(table[i]);
+
+    for (i = 0; i < vdel.len; i++)
+        trans_table[(int) Py_CHARMASK( ((unsigned char*)vdel.buf)[i] )] = -1;
+
+    for (i = inlen; --i >= 0; ) {
+        c = Py_CHARMASK(*input++);
+        if (trans_table[c] != -1)
+            if (Py_CHARMASK(*output++ = (char)trans_table[c]) == c)
+                    continue;
+        changed = 1;
+    }
+    if (!changed && PyByteArray_CheckExact(input_obj)) {
+        Py_DECREF(result);
+        Py_INCREF(input_obj);
+        result = input_obj;
+        goto done;
+    }
+    /* Fix the size of the resulting string */
+    if (inlen > 0)
+        PyByteArray_Resize(result, output - output_start);
+
+done:
+    PyObject_ReleaseBuffer(tableobj, &vtable);
+    if (delobj != NULL)
+        PyObject_ReleaseBuffer(delobj, &vdel);
+    return result;
+}
+
+
+#define FORWARD 1
+#define REVERSE -1
+
+/* find and count characters and substrings */
+
+#define findchar(target, target_len, c)                         \
+  ((char *)memchr((const void *)(target), c, target_len))
+
+/* Don't call if length < 2 */
+#define Py_STRING_MATCH(target, offset, pattern, length)        \
+  (target[offset] == pattern[0] &&                              \
+   target[offset+length-1] == pattern[length-1] &&              \
+   !memcmp(target+offset+1, pattern+1, length-2) )
+
+
+/* Bytes ops must return a string.  */
+/* If the object is subclass of bytes, create a copy */
+Py_LOCAL(PyByteArrayObject *)
+return_self(PyByteArrayObject *self)
+{
+    if (PyByteArray_CheckExact(self)) {
+        Py_INCREF(self);
+        return (PyByteArrayObject *)self;
+    }
+    return (PyByteArrayObject *)PyByteArray_FromStringAndSize(
+            PyByteArray_AS_STRING(self),
+            PyByteArray_GET_SIZE(self));
+}
+
+Py_LOCAL_INLINE(Py_ssize_t)
+countchar(const char *target, Py_ssize_t target_len, char c, Py_ssize_t maxcount)
+{
+    Py_ssize_t count=0;
+    const char *start=target;
+    const char *end=target+target_len;
+
+    while ( (start=findchar(start, end-start, c)) != NULL ) {
+        count++;
+        if (count >= maxcount)
+            break;
+        start += 1;
+    }
+    return count;
+}
+
+Py_LOCAL(Py_ssize_t)
+findstring(const char *target, Py_ssize_t target_len,
+           const char *pattern, Py_ssize_t pattern_len,
+           Py_ssize_t start,
+           Py_ssize_t end,
+           int direction)
+{
+    if (start < 0) {
+        start += target_len;
+        if (start < 0)
+            start = 0;
+    }
+    if (end > target_len) {
+        end = target_len;
+    } else if (end < 0) {
+        end += target_len;
+        if (end < 0)
+            end = 0;
+    }
+
+    /* zero-length substrings always match at the first attempt */
+    if (pattern_len == 0)
+        return (direction > 0) ? start : end;
+
+    end -= pattern_len;
+
+    if (direction < 0) {
+        for (; end >= start; end--)
+            if (Py_STRING_MATCH(target, end, pattern, pattern_len))
+                return end;
+    } else {
+        for (; start <= end; start++)
+            if (Py_STRING_MATCH(target, start, pattern, pattern_len))
+                return start;
+    }
+    return -1;
+}
+
+Py_LOCAL_INLINE(Py_ssize_t)
+countstring(const char *target, Py_ssize_t target_len,
+            const char *pattern, Py_ssize_t pattern_len,
+            Py_ssize_t start,
+            Py_ssize_t end,
+            int direction, Py_ssize_t maxcount)
+{
+    Py_ssize_t count=0;
+
+    if (start < 0) {
+        start += target_len;
+        if (start < 0)
+            start = 0;
+    }
+    if (end > target_len) {
+        end = target_len;
+    } else if (end < 0) {
+        end += target_len;
+        if (end < 0)
+            end = 0;
+    }
+
+    /* zero-length substrings match everywhere */
+    if (pattern_len == 0 || maxcount == 0) {
+        if (target_len+1 < maxcount)
+            return target_len+1;
+        return maxcount;
+    }
+
+    end -= pattern_len;
+    if (direction < 0) {
+        for (; (end >= start); end--)
+            if (Py_STRING_MATCH(target, end, pattern, pattern_len)) {
+                count++;
+                if (--maxcount <= 0) break;
+                end -= pattern_len-1;
+            }
+    } else {
+        for (; (start <= end); start++)
+            if (Py_STRING_MATCH(target, start, pattern, pattern_len)) {
+                count++;
+                if (--maxcount <= 0)
+                    break;
+                start += pattern_len-1;
+            }
+    }
+    return count;
+}
+
+
+/* Algorithms for different cases of string replacement */
+
+/* len(self)>=1, from="", len(to)>=1, maxcount>=1 */
+Py_LOCAL(PyByteArrayObject *)
+replace_interleave(PyByteArrayObject *self,
+                   const char *to_s, Py_ssize_t to_len,
+                   Py_ssize_t maxcount)
+{
+    char *self_s, *result_s;
+    Py_ssize_t self_len, result_len;
+    Py_ssize_t count, i, product;
+    PyByteArrayObject *result;
+
+    self_len = PyByteArray_GET_SIZE(self);
+
+    /* 1 at the end plus 1 after every character */
+    count = self_len+1;
+    if (maxcount < count)
+        count = maxcount;
+
+    /* Check for overflow */
+    /*   result_len = count * to_len + self_len; */
+    product = count * to_len;
+    if (product / to_len != count) {
+        PyErr_SetString(PyExc_OverflowError,
+                        "replace string is too long");
+        return NULL;
+    }
+    result_len = product + self_len;
+    if (result_len < 0) {
+        PyErr_SetString(PyExc_OverflowError,
+                        "replace string is too long");
+        return NULL;
+    }
+
+    if (! (result = (PyByteArrayObject *)
+                     PyByteArray_FromStringAndSize(NULL, result_len)) )
+        return NULL;
+
+    self_s = PyByteArray_AS_STRING(self);
+    result_s = PyByteArray_AS_STRING(result);
+
+    /* TODO: special case single character, which doesn't need memcpy */
+
+    /* Lay the first one down (guaranteed this will occur) */
+    Py_MEMCPY(result_s, to_s, to_len);
+    result_s += to_len;
+    count -= 1;
+
+    for (i=0; i<count; i++) {
+        *result_s++ = *self_s++;
+        Py_MEMCPY(result_s, to_s, to_len);
+        result_s += to_len;
+    }
+
+    /* Copy the rest of the original string */
+    Py_MEMCPY(result_s, self_s, self_len-i);
+
+    return result;
+}
+
+/* Special case for deleting a single character */
+/* len(self)>=1, len(from)==1, to="", maxcount>=1 */
+Py_LOCAL(PyByteArrayObject *)
+replace_delete_single_character(PyByteArrayObject *self,
+                                char from_c, Py_ssize_t maxcount)
+{
+    char *self_s, *result_s;
+    char *start, *next, *end;
+    Py_ssize_t self_len, result_len;
+    Py_ssize_t count;
+    PyByteArrayObject *result;
+
+    self_len = PyByteArray_GET_SIZE(self);
+    self_s = PyByteArray_AS_STRING(self);
+
+    count = countchar(self_s, self_len, from_c, maxcount);
+    if (count == 0) {
+        return return_self(self);
+    }
+
+    result_len = self_len - count;  /* from_len == 1 */
+    assert(result_len>=0);
+
+    if ( (result = (PyByteArrayObject *)
+                    PyByteArray_FromStringAndSize(NULL, result_len)) == NULL)
+        return NULL;
+    result_s = PyByteArray_AS_STRING(result);
+
+    start = self_s;
+    end = self_s + self_len;
+    while (count-- > 0) {
+        next = findchar(start, end-start, from_c);
+        if (next == NULL)
+            break;
+        Py_MEMCPY(result_s, start, next-start);
+        result_s += (next-start);
+        start = next+1;
+    }
+    Py_MEMCPY(result_s, start, end-start);
+
+    return result;
+}
+
+/* len(self)>=1, len(from)>=2, to="", maxcount>=1 */
+
+Py_LOCAL(PyByteArrayObject *)
+replace_delete_substring(PyByteArrayObject *self,
+                         const char *from_s, Py_ssize_t from_len,
+                         Py_ssize_t maxcount)
+{
+    char *self_s, *result_s;
+    char *start, *next, *end;
+    Py_ssize_t self_len, result_len;
+    Py_ssize_t count, offset;
+    PyByteArrayObject *result;
+
+    self_len = PyByteArray_GET_SIZE(self);
+    self_s = PyByteArray_AS_STRING(self);
+
+    count = countstring(self_s, self_len,
+                        from_s, from_len,
+                        0, self_len, 1,
+                        maxcount);
+
+    if (count == 0) {
+        /* no matches */
+        return return_self(self);
+    }
+
+    result_len = self_len - (count * from_len);
+    assert (result_len>=0);
+
+    if ( (result = (PyByteArrayObject *)
+        PyByteArray_FromStringAndSize(NULL, result_len)) == NULL )
+            return NULL;
+
+    result_s = PyByteArray_AS_STRING(result);
+
+    start = self_s;
+    end = self_s + self_len;
+    while (count-- > 0) {
+        offset = findstring(start, end-start,
+                            from_s, from_len,
+                            0, end-start, FORWARD);
+        if (offset == -1)
+            break;
+        next = start + offset;
+
+        Py_MEMCPY(result_s, start, next-start);
+
+        result_s += (next-start);
+        start = next+from_len;
+    }
+    Py_MEMCPY(result_s, start, end-start);
+    return result;
+}
+
+/* len(self)>=1, len(from)==len(to)==1, maxcount>=1 */
+Py_LOCAL(PyByteArrayObject *)
+replace_single_character_in_place(PyByteArrayObject *self,
+                                  char from_c, char to_c,
+                                  Py_ssize_t maxcount)
+{
+        char *self_s, *result_s, *start, *end, *next;
+        Py_ssize_t self_len;
+        PyByteArrayObject *result;
+
+        /* The result string will be the same size */
+        self_s = PyByteArray_AS_STRING(self);
+        self_len = PyByteArray_GET_SIZE(self);
+
+        next = findchar(self_s, self_len, from_c);
+
+        if (next == NULL) {
+                /* No matches; return the original bytes */
+                return return_self(self);
+        }
+
+        /* Need to make a new bytes */
+        result = (PyByteArrayObject *) PyByteArray_FromStringAndSize(NULL, self_len);
+        if (result == NULL)
+                return NULL;
+        result_s = PyByteArray_AS_STRING(result);
+        Py_MEMCPY(result_s, self_s, self_len);
+
+        /* change everything in-place, starting with this one */
+        start =  result_s + (next-self_s);
+        *start = to_c;
+        start++;
+        end = result_s + self_len;
+
+        while (--maxcount > 0) {
+                next = findchar(start, end-start, from_c);
+                if (next == NULL)
+                        break;
+                *next = to_c;
+                start = next+1;
+        }
+
+        return result;
+}
+
+/* len(self)>=1, len(from)==len(to)>=2, maxcount>=1 */
+Py_LOCAL(PyByteArrayObject *)
+replace_substring_in_place(PyByteArrayObject *self,
+                           const char *from_s, Py_ssize_t from_len,
+                           const char *to_s, Py_ssize_t to_len,
+                           Py_ssize_t maxcount)
+{
+    char *result_s, *start, *end;
+    char *self_s;
+    Py_ssize_t self_len, offset;
+    PyByteArrayObject *result;
+
+    /* The result bytes will be the same size */
+
+    self_s = PyByteArray_AS_STRING(self);
+    self_len = PyByteArray_GET_SIZE(self);
+
+    offset = findstring(self_s, self_len,
+                        from_s, from_len,
+                        0, self_len, FORWARD);
+    if (offset == -1) {
+        /* No matches; return the original bytes */
+        return return_self(self);
+    }
+
+    /* Need to make a new bytes */
+    result = (PyByteArrayObject *) PyByteArray_FromStringAndSize(NULL, self_len);
+    if (result == NULL)
+        return NULL;
+    result_s = PyByteArray_AS_STRING(result);
+    Py_MEMCPY(result_s, self_s, self_len);
+
+    /* change everything in-place, starting with this one */
+    start =  result_s + offset;
+    Py_MEMCPY(start, to_s, from_len);
+    start += from_len;
+    end = result_s + self_len;
+
+    while ( --maxcount > 0) {
+        offset = findstring(start, end-start,
+                            from_s, from_len,
+                            0, end-start, FORWARD);
+        if (offset==-1)
+            break;
+        Py_MEMCPY(start+offset, to_s, from_len);
+        start += offset+from_len;
+    }
+
+    return result;
+}
+
+/* len(self)>=1, len(from)==1, len(to)>=2, maxcount>=1 */
+Py_LOCAL(PyByteArrayObject *)
+replace_single_character(PyByteArrayObject *self,
+                         char from_c,
+                         const char *to_s, Py_ssize_t to_len,
+                         Py_ssize_t maxcount)
+{
+    char *self_s, *result_s;
+    char *start, *next, *end;
+    Py_ssize_t self_len, result_len;
+    Py_ssize_t count, product;
+    PyByteArrayObject *result;
+
+    self_s = PyByteArray_AS_STRING(self);
+    self_len = PyByteArray_GET_SIZE(self);
+
+    count = countchar(self_s, self_len, from_c, maxcount);
+    if (count == 0) {
+        /* no matches, return unchanged */
+        return return_self(self);
+    }
+
+    /* use the difference between current and new, hence the "-1" */
+    /*   result_len = self_len + count * (to_len-1)  */
+    product = count * (to_len-1);
+    if (product / (to_len-1) != count) {
+        PyErr_SetString(PyExc_OverflowError, "replace bytes is too long");
+        return NULL;
+    }
+    result_len = self_len + product;
+    if (result_len < 0) {
+            PyErr_SetString(PyExc_OverflowError, "replace bytes is too long");
+            return NULL;
+    }
+
+    if ( (result = (PyByteArrayObject *)
+          PyByteArray_FromStringAndSize(NULL, result_len)) == NULL)
+            return NULL;
+    result_s = PyByteArray_AS_STRING(result);
+
+    start = self_s;
+    end = self_s + self_len;
+    while (count-- > 0) {
+        next = findchar(start, end-start, from_c);
+        if (next == NULL)
+            break;
+
+        if (next == start) {
+            /* replace with the 'to' */
+            Py_MEMCPY(result_s, to_s, to_len);
+            result_s += to_len;
+            start += 1;
+        } else {
+            /* copy the unchanged old then the 'to' */
+            Py_MEMCPY(result_s, start, next-start);
+            result_s += (next-start);
+            Py_MEMCPY(result_s, to_s, to_len);
+            result_s += to_len;
+            start = next+1;
+        }
+    }
+    /* Copy the remainder of the remaining bytes */
+    Py_MEMCPY(result_s, start, end-start);
+
+    return result;
+}
+
+/* len(self)>=1, len(from)>=2, len(to)>=2, maxcount>=1 */
+Py_LOCAL(PyByteArrayObject *)
+replace_substring(PyByteArrayObject *self,
+                  const char *from_s, Py_ssize_t from_len,
+                  const char *to_s, Py_ssize_t to_len,
+                  Py_ssize_t maxcount)
+{
+    char *self_s, *result_s;
+    char *start, *next, *end;
+    Py_ssize_t self_len, result_len;
+    Py_ssize_t count, offset, product;
+    PyByteArrayObject *result;
+
+    self_s = PyByteArray_AS_STRING(self);
+    self_len = PyByteArray_GET_SIZE(self);
+
+    count = countstring(self_s, self_len,
+                        from_s, from_len,
+                        0, self_len, FORWARD, maxcount);
+    if (count == 0) {
+        /* no matches, return unchanged */
+        return return_self(self);
+    }
+
+    /* Check for overflow */
+    /*    result_len = self_len + count * (to_len-from_len) */
+    product = count * (to_len-from_len);
+    if (product / (to_len-from_len) != count) {
+        PyErr_SetString(PyExc_OverflowError, "replace bytes is too long");
+        return NULL;
+    }
+    result_len = self_len + product;
+    if (result_len < 0) {
+        PyErr_SetString(PyExc_OverflowError, "replace bytes is too long");
+        return NULL;
+    }
+
+    if ( (result = (PyByteArrayObject *)
+          PyByteArray_FromStringAndSize(NULL, result_len)) == NULL)
+        return NULL;
+    result_s = PyByteArray_AS_STRING(result);
+
+    start = self_s;
+    end = self_s + self_len;
+    while (count-- > 0) {
+        offset = findstring(start, end-start,
+                            from_s, from_len,
+                            0, end-start, FORWARD);
+        if (offset == -1)
+            break;
+        next = start+offset;
+        if (next == start) {
+            /* replace with the 'to' */
+            Py_MEMCPY(result_s, to_s, to_len);
+            result_s += to_len;
+            start += from_len;
+        } else {
+            /* copy the unchanged old then the 'to' */
+            Py_MEMCPY(result_s, start, next-start);
+            result_s += (next-start);
+            Py_MEMCPY(result_s, to_s, to_len);
+            result_s += to_len;
+            start = next+from_len;
+        }
+    }
+    /* Copy the remainder of the remaining bytes */
+    Py_MEMCPY(result_s, start, end-start);
+
+    return result;
+}
+
+
+Py_LOCAL(PyByteArrayObject *)
+replace(PyByteArrayObject *self,
+        const char *from_s, Py_ssize_t from_len,
+        const char *to_s, Py_ssize_t to_len,
+        Py_ssize_t maxcount)
+{
+    if (maxcount < 0) {
+        maxcount = PY_SSIZE_T_MAX;
+    } else if (maxcount == 0 || PyByteArray_GET_SIZE(self) == 0) {
+        /* nothing to do; return the original bytes */
+        return return_self(self);
+    }
+
+    if (maxcount == 0 ||
+        (from_len == 0 && to_len == 0)) {
+        /* nothing to do; return the original bytes */
+        return return_self(self);
+    }
+
+    /* Handle zero-length special cases */
+
+    if (from_len == 0) {
+        /* insert the 'to' bytes everywhere.   */
+        /*    >>> "Python".replace("", ".")     */
+        /*    '.P.y.t.h.o.n.'                   */
+        return replace_interleave(self, to_s, to_len, maxcount);
+    }
+
+    /* Except for "".replace("", "A") == "A" there is no way beyond this */
+    /* point for an empty self bytes to generate a non-empty bytes */
+    /* Special case so the remaining code always gets a non-empty bytes */
+    if (PyByteArray_GET_SIZE(self) == 0) {
+        return return_self(self);
+    }
+
+    if (to_len == 0) {
+        /* delete all occurances of 'from' bytes */
+        if (from_len == 1) {
+            return replace_delete_single_character(
+                    self, from_s[0], maxcount);
+        } else {
+            return replace_delete_substring(self, from_s, from_len, maxcount);
+        }
+    }
+
+    /* Handle special case where both bytes have the same length */
+
+    if (from_len == to_len) {
+        if (from_len == 1) {
+            return replace_single_character_in_place(
+                    self,
+                    from_s[0],
+                    to_s[0],
+                    maxcount);
+        } else {
+            return replace_substring_in_place(
+                self, from_s, from_len, to_s, to_len, maxcount);
+        }
+    }
+
+    /* Otherwise use the more generic algorithms */
+    if (from_len == 1) {
+        return replace_single_character(self, from_s[0],
+                                        to_s, to_len, maxcount);
+    } else {
+        /* len('from')>=2, len('to')>=1 */
+        return replace_substring(self, from_s, from_len, to_s, to_len, maxcount);
+    }
+}
+
+
+PyDoc_STRVAR(replace__doc__,
+"B.replace(old, new[, count]) -> bytes\n\
+\n\
+Return a copy of B with all occurrences of subsection\n\
+old replaced by new.  If the optional argument count is\n\
+given, only the first count occurrences are replaced.");
+
+static PyObject *
+bytes_replace(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t count = -1;
+    PyObject *from, *to, *res;
+    Py_buffer vfrom, vto;
+
+    if (!PyArg_ParseTuple(args, "OO|n:replace", &from, &to, &count))
+        return NULL;
+
+    if (_getbuffer(from, &vfrom) < 0)
+        return NULL;
+    if (_getbuffer(to, &vto) < 0) {
+        PyObject_ReleaseBuffer(from, &vfrom);
+        return NULL;
+    }
+
+    res = (PyObject *)replace((PyByteArrayObject *) self,
+                              vfrom.buf, vfrom.len,
+                              vto.buf, vto.len, count);
+
+    PyObject_ReleaseBuffer(from, &vfrom);
+    PyObject_ReleaseBuffer(to, &vto);
+    return res;
+}
+
+
+/* Overallocate the initial list to reduce the number of reallocs for small
+   split sizes.  Eg, "A A A A A A A A A A".split() (10 elements) has three
+   resizes, to sizes 4, 8, then 16.  Most observed string splits are for human
+   text (roughly 11 words per line) and field delimited data (usually 1-10
+   fields).  For large strings the split algorithms are bandwidth limited
+   so increasing the preallocation likely will not improve things.*/
+
+#define MAX_PREALLOC 12
+
+/* 5 splits gives 6 elements */
+#define PREALLOC_SIZE(maxsplit) \
+    (maxsplit >= MAX_PREALLOC ? MAX_PREALLOC : maxsplit+1)
+
+#define SPLIT_APPEND(data, left, right)                         \
+    str = PyByteArray_FromStringAndSize((data) + (left),       \
+                                     (right) - (left));     \
+    if (str == NULL)                                        \
+        goto onError;                                   \
+    if (PyList_Append(list, str)) {                         \
+        Py_DECREF(str);                                 \
+        goto onError;                                   \
+    }                                                       \
+    else                                                    \
+        Py_DECREF(str);
+
+#define SPLIT_ADD(data, left, right) {                          \
+    str = PyByteArray_FromStringAndSize((data) + (left),       \
+                                     (right) - (left));     \
+    if (str == NULL)                                        \
+        goto onError;                                   \
+    if (count < MAX_PREALLOC) {                             \
+        PyList_SET_ITEM(list, count, str);              \
+    } else {                                                \
+        if (PyList_Append(list, str)) {                 \
+            Py_DECREF(str);                         \
+            goto onError;                           \
+        }                                               \
+        else                                            \
+            Py_DECREF(str);                         \
+    }                                                       \
+    count++; }
+
+/* Always force the list to the expected size. */
+#define FIX_PREALLOC_SIZE(list) Py_SIZE(list) = count
+
+
+Py_LOCAL_INLINE(PyObject *)
+split_char(const char *s, Py_ssize_t len, char ch, Py_ssize_t maxcount)
+{
+    register Py_ssize_t i, j, count = 0;
+    PyObject *str;
+    PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
+
+    if (list == NULL)
+        return NULL;
+
+    i = j = 0;
+    while ((j < len) && (maxcount-- > 0)) {
+        for(; j < len; j++) {
+            /* I found that using memchr makes no difference */
+            if (s[j] == ch) {
+                SPLIT_ADD(s, i, j);
+                i = j = j + 1;
+                break;
+            }
+        }
+    }
+    if (i <= len) {
+        SPLIT_ADD(s, i, len);
+    }
+    FIX_PREALLOC_SIZE(list);
+    return list;
+
+  onError:
+    Py_DECREF(list);
+    return NULL;
+}
+
+
+Py_LOCAL_INLINE(PyObject *)
+split_whitespace(const char *s, Py_ssize_t len, Py_ssize_t maxcount)
+{
+    register Py_ssize_t i, j, count = 0;
+    PyObject *str;
+    PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
+
+    if (list == NULL)
+        return NULL;
+
+    for (i = j = 0; i < len; ) {
+        /* find a token */
+        while (i < len && ISSPACE(s[i]))
+            i++;
+        j = i;
+        while (i < len && !ISSPACE(s[i]))
+            i++;
+        if (j < i) {
+            if (maxcount-- <= 0)
+                break;
+            SPLIT_ADD(s, j, i);
+            while (i < len && ISSPACE(s[i]))
+                i++;
+            j = i;
+        }
+    }
+    if (j < len) {
+        SPLIT_ADD(s, j, len);
+    }
+    FIX_PREALLOC_SIZE(list);
+    return list;
+
+  onError:
+    Py_DECREF(list);
+    return NULL;
+}
+
+PyDoc_STRVAR(split__doc__,
+"B.split([sep[, maxsplit]]) -> list of bytearray\n\
+\n\
+Return a list of the sections in B, using sep as the delimiter.\n\
+If sep is not given, B is split on ASCII whitespace characters\n\
+(space, tab, return, newline, formfeed, vertical tab).\n\
+If maxsplit is given, at most maxsplit splits are done.");
+
+static PyObject *
+bytes_split(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t len = PyByteArray_GET_SIZE(self), n, i, j;
+    Py_ssize_t maxsplit = -1, count = 0;
+    const char *s = PyByteArray_AS_STRING(self), *sub;
+    PyObject *list, *str, *subobj = Py_None;
+    Py_buffer vsub;
+#ifdef USE_FAST
+    Py_ssize_t pos;
+#endif
+
+    if (!PyArg_ParseTuple(args, "|On:split", &subobj, &maxsplit))
+        return NULL;
+    if (maxsplit < 0)
+        maxsplit = PY_SSIZE_T_MAX;
+
+    if (subobj == Py_None)
+        return split_whitespace(s, len, maxsplit);
+
+    if (_getbuffer(subobj, &vsub) < 0)
+        return NULL;
+    sub = vsub.buf;
+    n = vsub.len;
+
+    if (n == 0) {
+        PyErr_SetString(PyExc_ValueError, "empty separator");
+        PyObject_ReleaseBuffer(subobj, &vsub);
+        return NULL;
+    }
+    if (n == 1)
+        return split_char(s, len, sub[0], maxsplit);
+
+    list = PyList_New(PREALLOC_SIZE(maxsplit));
+    if (list == NULL) {
+        PyObject_ReleaseBuffer(subobj, &vsub);
+        return NULL;
+    }
+
+#ifdef USE_FAST
+    i = j = 0;
+    while (maxsplit-- > 0) {
+        pos = fastsearch(s+i, len-i, sub, n, FAST_SEARCH);
+        if (pos < 0)
+                break;
+        j = i+pos;
+        SPLIT_ADD(s, i, j);
+        i = j + n;
+    }
+#else
+    i = j = 0;
+    while ((j+n <= len) && (maxsplit-- > 0)) {
+        for (; j+n <= len; j++) {
+            if (Py_STRING_MATCH(s, j, sub, n)) {
+                SPLIT_ADD(s, i, j);
+                i = j = j + n;
+                break;
+            }
+        }
+    }
+#endif
+    SPLIT_ADD(s, i, len);
+    FIX_PREALLOC_SIZE(list);
+    PyObject_ReleaseBuffer(subobj, &vsub);
+    return list;
+
+  onError:
+    Py_DECREF(list);
+    PyObject_ReleaseBuffer(subobj, &vsub);
+    return NULL;
+}
+
+/* stringlib's partition shares nullbytes in some cases.
+   undo this, we don't want the nullbytes to be shared. */
+static PyObject *
+make_nullbytes_unique(PyObject *result)
+{
+    if (result != NULL) {
+        int i;
+        assert(PyTuple_Check(result));
+        assert(PyTuple_GET_SIZE(result) == 3);
+        for (i = 0; i < 3; i++) {
+            if (PyTuple_GET_ITEM(result, i) == (PyObject *)nullbytes) {
+                PyObject *new = PyByteArray_FromStringAndSize(NULL, 0);
+                if (new == NULL) {
+                    Py_DECREF(result);
+                    result = NULL;
+                    break;
+                }
+                Py_DECREF(nullbytes);
+                PyTuple_SET_ITEM(result, i, new);
+            }
+        }
+    }
+    return result;
+}
+
+PyDoc_STRVAR(partition__doc__,
+"B.partition(sep) -> (head, sep, tail)\n\
+\n\
+Searches for the separator sep in B, and returns the part before it,\n\
+the separator itself, and the part after it.  If the separator is not\n\
+found, returns B and two empty bytearray objects.");
+
+static PyObject *
+bytes_partition(PyByteArrayObject *self, PyObject *sep_obj)
+{
+    PyObject *bytesep, *result;
+
+    bytesep = PyByteArray_FromObject(sep_obj);
+    if (! bytesep)
+        return NULL;
+
+    result = stringlib_partition(
+            (PyObject*) self,
+            PyByteArray_AS_STRING(self), PyByteArray_GET_SIZE(self),
+            bytesep,
+            PyByteArray_AS_STRING(bytesep), PyByteArray_GET_SIZE(bytesep)
+            );
+
+    Py_DECREF(bytesep);
+    return make_nullbytes_unique(result);
+}
+
+PyDoc_STRVAR(rpartition__doc__,
+"B.rpartition(sep) -> (tail, sep, head)\n\
+\n\
+Searches for the separator sep in B, starting at the end of B,\n\
+and returns the part before it, the separator itself, and the\n\
+part after it.  If the separator is not found, returns two empty\n\
+bytearray objects and B.");
+
+static PyObject *
+bytes_rpartition(PyByteArrayObject *self, PyObject *sep_obj)
+{
+    PyObject *bytesep, *result;
+
+    bytesep = PyByteArray_FromObject(sep_obj);
+    if (! bytesep)
+        return NULL;
+
+    result = stringlib_rpartition(
+            (PyObject*) self,
+            PyByteArray_AS_STRING(self), PyByteArray_GET_SIZE(self),
+            bytesep,
+            PyByteArray_AS_STRING(bytesep), PyByteArray_GET_SIZE(bytesep)
+            );
+
+    Py_DECREF(bytesep);
+    return make_nullbytes_unique(result);
+}
+
+Py_LOCAL_INLINE(PyObject *)
+rsplit_char(const char *s, Py_ssize_t len, char ch, Py_ssize_t maxcount)
+{
+    register Py_ssize_t i, j, count=0;
+    PyObject *str;
+    PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
+
+    if (list == NULL)
+        return NULL;
+
+    i = j = len - 1;
+    while ((i >= 0) && (maxcount-- > 0)) {
+        for (; i >= 0; i--) {
+            if (s[i] == ch) {
+                SPLIT_ADD(s, i + 1, j + 1);
+                j = i = i - 1;
+                break;
+            }
+        }
+    }
+    if (j >= -1) {
+        SPLIT_ADD(s, 0, j + 1);
+    }
+    FIX_PREALLOC_SIZE(list);
+    if (PyList_Reverse(list) < 0)
+        goto onError;
+
+    return list;
+
+  onError:
+    Py_DECREF(list);
+    return NULL;
+}
+
+Py_LOCAL_INLINE(PyObject *)
+rsplit_whitespace(const char *s, Py_ssize_t len, Py_ssize_t maxcount)
+{
+    register Py_ssize_t i, j, count = 0;
+    PyObject *str;
+    PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
+
+    if (list == NULL)
+        return NULL;
+
+    for (i = j = len - 1; i >= 0; ) {
+        /* find a token */
+        while (i >= 0 && ISSPACE(s[i]))
+            i--;
+        j = i;
+        while (i >= 0 && !ISSPACE(s[i]))
+            i--;
+        if (j > i) {
+            if (maxcount-- <= 0)
+                break;
+            SPLIT_ADD(s, i + 1, j + 1);
+            while (i >= 0 && ISSPACE(s[i]))
+                i--;
+            j = i;
+        }
+    }
+    if (j >= 0) {
+        SPLIT_ADD(s, 0, j + 1);
+    }
+    FIX_PREALLOC_SIZE(list);
+    if (PyList_Reverse(list) < 0)
+        goto onError;
+
+    return list;
+
+  onError:
+    Py_DECREF(list);
+    return NULL;
+}
+
+PyDoc_STRVAR(rsplit__doc__,
+"B.rsplit(sep[, maxsplit]) -> list of bytearray\n\
+\n\
+Return a list of the sections in B, using sep as the delimiter,\n\
+starting at the end of B and working to the front.\n\
+If sep is not given, B is split on ASCII whitespace characters\n\
+(space, tab, return, newline, formfeed, vertical tab).\n\
+If maxsplit is given, at most maxsplit splits are done.");
+
+static PyObject *
+bytes_rsplit(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t len = PyByteArray_GET_SIZE(self), n, i, j;
+    Py_ssize_t maxsplit = -1, count = 0;
+    const char *s = PyByteArray_AS_STRING(self), *sub;
+    PyObject *list, *str, *subobj = Py_None;
+    Py_buffer vsub;
+
+    if (!PyArg_ParseTuple(args, "|On:rsplit", &subobj, &maxsplit))
+        return NULL;
+    if (maxsplit < 0)
+        maxsplit = PY_SSIZE_T_MAX;
+
+    if (subobj == Py_None)
+        return rsplit_whitespace(s, len, maxsplit);
+
+    if (_getbuffer(subobj, &vsub) < 0)
+        return NULL;
+    sub = vsub.buf;
+    n = vsub.len;
+
+    if (n == 0) {
+        PyErr_SetString(PyExc_ValueError, "empty separator");
+        PyObject_ReleaseBuffer(subobj, &vsub);
+        return NULL;
+    }
+    else if (n == 1)
+        return rsplit_char(s, len, sub[0], maxsplit);
+
+    list = PyList_New(PREALLOC_SIZE(maxsplit));
+    if (list == NULL) {
+        PyObject_ReleaseBuffer(subobj, &vsub);
+        return NULL;
+    }
+
+    j = len;
+    i = j - n;
+
+    while ( (i >= 0) && (maxsplit-- > 0) ) {
+        for (; i>=0; i--) {
+            if (Py_STRING_MATCH(s, i, sub, n)) {
+                SPLIT_ADD(s, i + n, j);
+                j = i;
+                i -= n;
+                break;
+            }
+        }
+    }
+    SPLIT_ADD(s, 0, j);
+    FIX_PREALLOC_SIZE(list);
+    if (PyList_Reverse(list) < 0)
+        goto onError;
+    PyObject_ReleaseBuffer(subobj, &vsub);
+    return list;
+
+onError:
+    Py_DECREF(list);
+    PyObject_ReleaseBuffer(subobj, &vsub);
+    return NULL;
+}
+
+PyDoc_STRVAR(reverse__doc__,
+"B.reverse() -> None\n\
+\n\
+Reverse the order of the values in B in place.");
+static PyObject *
+bytes_reverse(PyByteArrayObject *self, PyObject *unused)
+{
+    char swap, *head, *tail;
+    Py_ssize_t i, j, n = Py_SIZE(self);
+
+    j = n / 2;
+    head = self->ob_bytes;
+    tail = head + n - 1;
+    for (i = 0; i < j; i++) {
+        swap = *head;
+        *head++ = *tail;
+        *tail-- = swap;
+    }
+
+    Py_RETURN_NONE;
+}
+
+PyDoc_STRVAR(insert__doc__,
+"B.insert(index, int) -> None\n\
+\n\
+Insert a single item into the bytearray before the given index.");
+static PyObject *
+bytes_insert(PyByteArrayObject *self, PyObject *args)
+{
+    int value;
+    Py_ssize_t where, n = Py_SIZE(self);
+
+    if (!PyArg_ParseTuple(args, "ni:insert", &where, &value))
+        return NULL;
+
+    if (n == PY_SSIZE_T_MAX) {
+        PyErr_SetString(PyExc_OverflowError,
+                        "cannot add more objects to bytes");
+        return NULL;
+    }
+    if (value < 0 || value >= 256) {
+        PyErr_SetString(PyExc_ValueError,
+                        "byte must be in range(0, 256)");
+        return NULL;
+    }
+    if (PyByteArray_Resize((PyObject *)self, n + 1) < 0)
+        return NULL;
+
+    if (where < 0) {
+        where += n;
+        if (where < 0)
+            where = 0;
+    }
+    if (where > n)
+        where = n;
+    memmove(self->ob_bytes + where + 1, self->ob_bytes + where, n - where);
+    self->ob_bytes[where] = value;
+
+    Py_RETURN_NONE;
+}
+
+PyDoc_STRVAR(append__doc__,
+"B.append(int) -> None\n\
+\n\
+Append a single item to the end of B.");
+static PyObject *
+bytes_append(PyByteArrayObject *self, PyObject *arg)
+{
+    int value;
+    Py_ssize_t n = Py_SIZE(self);
+
+    if (! _getbytevalue(arg, &value))
+        return NULL;
+    if (n == PY_SSIZE_T_MAX) {
+        PyErr_SetString(PyExc_OverflowError,
+                        "cannot add more objects to bytes");
+        return NULL;
+    }
+    if (PyByteArray_Resize((PyObject *)self, n + 1) < 0)
+        return NULL;
+
+    self->ob_bytes[n] = value;
+
+    Py_RETURN_NONE;
+}
+
+PyDoc_STRVAR(extend__doc__,
+"B.extend(iterable int) -> None\n\
+\n\
+Append all the elements from the iterator or sequence to the\n\
+end of B.");
+static PyObject *
+bytes_extend(PyByteArrayObject *self, PyObject *arg)
+{
+    PyObject *it, *item, *bytes_obj;
+    Py_ssize_t buf_size = 0, len = 0;
+    int value;
+    char *buf;
+
+    /* bytes_setslice code only accepts something supporting PEP 3118. */
+    if (PyObject_CheckBuffer(arg)) {
+        if (bytes_setslice(self, Py_SIZE(self), Py_SIZE(self), arg) == -1)
+            return NULL;
+
+        Py_RETURN_NONE;
+    }
+
+    it = PyObject_GetIter(arg);
+    if (it == NULL)
+        return NULL;
+
+    /* Try to determine the length of the argument. 32 is abitrary. */
+    buf_size = _PyObject_LengthHint(arg, 32);
+
+    bytes_obj = PyByteArray_FromStringAndSize(NULL, buf_size);
+    if (bytes_obj == NULL)
+        return NULL;
+    buf = PyByteArray_AS_STRING(bytes_obj);
+
+    while ((item = PyIter_Next(it)) != NULL) {
+        if (! _getbytevalue(item, &value)) {
+            Py_DECREF(item);
+            Py_DECREF(it);
+            Py_DECREF(bytes_obj);
+            return NULL;
+        }
+        buf[len++] = value;
+        Py_DECREF(item);
+
+        if (len >= buf_size) {
+            buf_size = len + (len >> 1) + 1;
+            if (PyByteArray_Resize((PyObject *)bytes_obj, buf_size) < 0) {
+                Py_DECREF(it);
+                Py_DECREF(bytes_obj);
+                return NULL;
+            }
+            /* Recompute the `buf' pointer, since the resizing operation may
+               have invalidated it. */
+            buf = PyByteArray_AS_STRING(bytes_obj);
+        }
+    }
+    Py_DECREF(it);
+
+    /* Resize down to exact size. */
+    if (PyByteArray_Resize((PyObject *)bytes_obj, len) < 0) {
+        Py_DECREF(bytes_obj);
+        return NULL;
+    }
+
+    if (bytes_setslice(self, Py_SIZE(self), Py_SIZE(self), bytes_obj) == -1)
+        return NULL;
+    Py_DECREF(bytes_obj);
+
+    Py_RETURN_NONE;
+}
+
+PyDoc_STRVAR(pop__doc__,
+"B.pop([index]) -> int\n\
+\n\
+Remove and return a single item from B. If no index\n\
+argument is give, will pop the last value.");
+static PyObject *
+bytes_pop(PyByteArrayObject *self, PyObject *args)
+{
+    int value;
+    Py_ssize_t where = -1, n = Py_SIZE(self);
+
+    if (!PyArg_ParseTuple(args, "|n:pop", &where))
+        return NULL;
+
+    if (n == 0) {
+        PyErr_SetString(PyExc_OverflowError,
+                        "cannot pop an empty bytes");
+        return NULL;
+    }
+    if (where < 0)
+        where += Py_SIZE(self);
+    if (where < 0 || where >= Py_SIZE(self)) {
+        PyErr_SetString(PyExc_IndexError, "pop index out of range");
+        return NULL;
+    }
+
+    value = self->ob_bytes[where];
+    memmove(self->ob_bytes + where, self->ob_bytes + where + 1, n - where);
+    if (PyByteArray_Resize((PyObject *)self, n - 1) < 0)
+        return NULL;
+
+    return PyLong_FromLong(value);
+}
+
+PyDoc_STRVAR(remove__doc__,
+"B.remove(int) -> None\n\
+\n\
+Remove the first occurance of a value in B.");
+static PyObject *
+bytes_remove(PyByteArrayObject *self, PyObject *arg)
+{
+    int value;
+    Py_ssize_t where, n = Py_SIZE(self);
+
+    if (! _getbytevalue(arg, &value))
+        return NULL;
+
+    for (where = 0; where < n; where++) {
+        if (self->ob_bytes[where] == value)
+            break;
+    }
+    if (where == n) {
+        PyErr_SetString(PyExc_ValueError, "value not found in bytes");
+        return NULL;
+    }
+
+    memmove(self->ob_bytes + where, self->ob_bytes + where + 1, n - where);
+    if (PyByteArray_Resize((PyObject *)self, n - 1) < 0)
+        return NULL;
+
+    Py_RETURN_NONE;
+}
+
+/* XXX These two helpers could be optimized if argsize == 1 */
+
+static Py_ssize_t
+lstrip_helper(unsigned char *myptr, Py_ssize_t mysize,
+              void *argptr, Py_ssize_t argsize)
+{
+    Py_ssize_t i = 0;
+    while (i < mysize && memchr(argptr, myptr[i], argsize))
+        i++;
+    return i;
+}
+
+static Py_ssize_t
+rstrip_helper(unsigned char *myptr, Py_ssize_t mysize,
+              void *argptr, Py_ssize_t argsize)
+{
+    Py_ssize_t i = mysize - 1;
+    while (i >= 0 && memchr(argptr, myptr[i], argsize))
+        i--;
+    return i + 1;
+}
+
+PyDoc_STRVAR(strip__doc__,
+"B.strip([bytes]) -> bytearray\n\
+\n\
+Strip leading and trailing bytes contained in the argument.\n\
+If the argument is omitted, strip ASCII whitespace.");
+static PyObject *
+bytes_strip(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t left, right, mysize, argsize;
+    void *myptr, *argptr;
+    PyObject *arg = Py_None;
+    Py_buffer varg;
+    if (!PyArg_ParseTuple(args, "|O:strip", &arg))
+        return NULL;
+    if (arg == Py_None) {
+        argptr = "\t\n\r\f\v ";
+        argsize = 6;
+    }
+    else {
+        if (_getbuffer(arg, &varg) < 0)
+            return NULL;
+        argptr = varg.buf;
+        argsize = varg.len;
+    }
+    myptr = self->ob_bytes;
+    mysize = Py_SIZE(self);
+    left = lstrip_helper(myptr, mysize, argptr, argsize);
+    if (left == mysize)
+        right = left;
+    else
+        right = rstrip_helper(myptr, mysize, argptr, argsize);
+    if (arg != Py_None)
+        PyObject_ReleaseBuffer(arg, &varg);
+    return PyByteArray_FromStringAndSize(self->ob_bytes + left, right - left);
+}
+
+PyDoc_STRVAR(lstrip__doc__,
+"B.lstrip([bytes]) -> bytearray\n\
+\n\
+Strip leading bytes contained in the argument.\n\
+If the argument is omitted, strip leading ASCII whitespace.");
+static PyObject *
+bytes_lstrip(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t left, right, mysize, argsize;
+    void *myptr, *argptr;
+    PyObject *arg = Py_None;
+    Py_buffer varg;
+    if (!PyArg_ParseTuple(args, "|O:lstrip", &arg))
+        return NULL;
+    if (arg == Py_None) {
+        argptr = "\t\n\r\f\v ";
+        argsize = 6;
+    }
+    else {
+        if (_getbuffer(arg, &varg) < 0)
+            return NULL;
+        argptr = varg.buf;
+        argsize = varg.len;
+    }
+    myptr = self->ob_bytes;
+    mysize = Py_SIZE(self);
+    left = lstrip_helper(myptr, mysize, argptr, argsize);
+    right = mysize;
+    if (arg != Py_None)
+        PyObject_ReleaseBuffer(arg, &varg);
+    return PyByteArray_FromStringAndSize(self->ob_bytes + left, right - left);
+}
+
+PyDoc_STRVAR(rstrip__doc__,
+"B.rstrip([bytes]) -> bytearray\n\
+\n\
+Strip trailing bytes contained in the argument.\n\
+If the argument is omitted, strip trailing ASCII whitespace.");
+static PyObject *
+bytes_rstrip(PyByteArrayObject *self, PyObject *args)
+{
+    Py_ssize_t left, right, mysize, argsize;
+    void *myptr, *argptr;
+    PyObject *arg = Py_None;
+    Py_buffer varg;
+    if (!PyArg_ParseTuple(args, "|O:rstrip", &arg))
+        return NULL;
+    if (arg == Py_None) {
+        argptr = "\t\n\r\f\v ";
+        argsize = 6;
+    }
+    else {
+        if (_getbuffer(arg, &varg) < 0)
+            return NULL;
+        argptr = varg.buf;
+        argsize = varg.len;
+    }
+    myptr = self->ob_bytes;
+    mysize = Py_SIZE(self);
+    left = 0;
+    right = rstrip_helper(myptr, mysize, argptr, argsize);
+    if (arg != Py_None)
+        PyObject_ReleaseBuffer(arg, &varg);
+    return PyByteArray_FromStringAndSize(self->ob_bytes + left, right - left);
+}
+
+PyDoc_STRVAR(decode_doc,
+"B.decode([encoding[, errors]]) -> unicode object.\n\
+\n\
+Decodes B using the codec registered for encoding. encoding defaults\n\
+to the default encoding. errors may be given to set a different error\n\
+handling scheme.  Default is 'strict' meaning that encoding errors raise\n\
+a UnicodeDecodeError.  Other possible values are 'ignore' and 'replace'\n\
+as well as any other name registered with codecs.register_error that is\n\
+able to handle UnicodeDecodeErrors.");
+
+static PyObject *
+bytes_decode(PyObject *self, PyObject *args)
+{
+    const char *encoding = NULL;
+    const char *errors = NULL;
+
+    if (!PyArg_ParseTuple(args, "|ss:decode", &encoding, &errors))
+        return NULL;
+    if (encoding == NULL)
+        encoding = PyUnicode_GetDefaultEncoding();
+    return PyCodec_Decode(self, encoding, errors);
+}
+
+PyDoc_STRVAR(alloc_doc,
+"B.__alloc__() -> int\n\
+\n\
+Returns the number of bytes actually allocated.");
+
+static PyObject *
+bytes_alloc(PyByteArrayObject *self)
+{
+    return PyLong_FromSsize_t(self->ob_alloc);
+}
+
+PyDoc_STRVAR(join_doc,
+"B.join(iterable_of_bytes) -> bytes\n\
+\n\
+Concatenates any number of bytearray objects, with B in between each pair.");
+
+static PyObject *
+bytes_join(PyByteArrayObject *self, PyObject *it)
+{
+    PyObject *seq;
+    Py_ssize_t mysize = Py_SIZE(self);
+    Py_ssize_t i;
+    Py_ssize_t n;
+    PyObject **items;
+    Py_ssize_t totalsize = 0;
+    PyObject *result;
+    char *dest;
+
+    seq = PySequence_Fast(it, "can only join an iterable");
+    if (seq == NULL)
+        return NULL;
+    n = PySequence_Fast_GET_SIZE(seq);
+    items = PySequence_Fast_ITEMS(seq);
+
+    /* Compute the total size, and check that they are all bytes */
+    /* XXX Shouldn't we use _getbuffer() on these items instead? */
+    for (i = 0; i < n; i++) {
+        PyObject *obj = items[i];
+        if (!PyByteArray_Check(obj) && !PyBytes_Check(obj)) {
+            PyErr_Format(PyExc_TypeError,
+                         "can only join an iterable of bytes "
+                         "(item %ld has type '%.100s')",
+                         /* XXX %ld isn't right on Win64 */
+                         (long)i, Py_TYPE(obj)->tp_name);
+            goto error;
+        }
+        if (i > 0)
+            totalsize += mysize;
+        totalsize += Py_SIZE(obj);
+        if (totalsize < 0) {
+            PyErr_NoMemory();
+            goto error;
+        }
+    }
+
+    /* Allocate the result, and copy the bytes */
+    result = PyByteArray_FromStringAndSize(NULL, totalsize);
+    if (result == NULL)
+        goto error;
+    dest = PyByteArray_AS_STRING(result);
+    for (i = 0; i < n; i++) {
+        PyObject *obj = items[i];
+        Py_ssize_t size = Py_SIZE(obj);
+        char *buf;
+        if (PyByteArray_Check(obj))
+           buf = PyByteArray_AS_STRING(obj);
+        else
+           buf = PyBytes_AS_STRING(obj);
+        if (i) {
+            memcpy(dest, self->ob_bytes, mysize);
+            dest += mysize;
+        }
+        memcpy(dest, buf, size);
+        dest += size;
+    }
+
+    /* Done */
+    Py_DECREF(seq);
+    return result;
+
+    /* Error handling */
+  error:
+    Py_DECREF(seq);
+    return NULL;
+}
+
+PyDoc_STRVAR(fromhex_doc,
+"bytearray.fromhex(string) -> bytearray\n\
+\n\
+Create a bytearray object from a string of hexadecimal numbers.\n\
+Spaces between two numbers are accepted.\n\
+Example: bytearray.fromhex('B9 01EF') -> bytearray(b'\\xb9\\x01\\xef').");
+
+static int
+hex_digit_to_int(Py_UNICODE c)
+{
+    if (c >= 128)
+        return -1;
+    if (ISDIGIT(c))
+        return c - '0';
+    else {
+        if (ISUPPER(c))
+            c = TOLOWER(c);
+        if (c >= 'a' && c <= 'f')
+            return c - 'a' + 10;
+    }
+    return -1;
+}
+
+static PyObject *
+bytes_fromhex(PyObject *cls, PyObject *args)
+{
+    PyObject *newbytes, *hexobj;
+    char *buf;
+    Py_UNICODE *hex;
+    Py_ssize_t hexlen, byteslen, i, j;
+    int top, bot;
+
+    if (!PyArg_ParseTuple(args, "U:fromhex", &hexobj))
+        return NULL;
+    assert(PyUnicode_Check(hexobj));
+    hexlen = PyUnicode_GET_SIZE(hexobj);
+    hex = PyUnicode_AS_UNICODE(hexobj);
+    byteslen = hexlen/2; /* This overestimates if there are spaces */
+    newbytes = PyByteArray_FromStringAndSize(NULL, byteslen);
+    if (!newbytes)
+        return NULL;
+    buf = PyByteArray_AS_STRING(newbytes);
+    for (i = j = 0; i < hexlen; i += 2) {
+        /* skip over spaces in the input */
+        while (hex[i] == ' ')
+            i++;
+        if (i >= hexlen)
+            break;
+        top = hex_digit_to_int(hex[i]);
+        bot = hex_digit_to_int(hex[i+1]);
+        if (top == -1 || bot == -1) {
+            PyErr_Format(PyExc_ValueError,
+                         "non-hexadecimal number found in "
+                         "fromhex() arg at position %zd", i);
+            goto error;
+        }
+        buf[j++] = (top << 4) + bot;
+    }
+    if (PyByteArray_Resize(newbytes, j) < 0)
+        goto error;
+    return newbytes;
+
+  error:
+    Py_DECREF(newbytes);
+    return NULL;
+}
+
+PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
+
+static PyObject *
+bytes_reduce(PyByteArrayObject *self)
+{
+    PyObject *latin1, *dict;
+    if (self->ob_bytes)
+        latin1 = PyUnicode_DecodeLatin1(self->ob_bytes,
+                                        Py_SIZE(self), NULL);
+    else
+        latin1 = PyUnicode_FromString("");
+
+    dict = PyObject_GetAttrString((PyObject *)self, "__dict__");
+    if (dict == NULL) {
+        PyErr_Clear();
+        dict = Py_None;
+        Py_INCREF(dict);
+    }
+
+    return Py_BuildValue("(O(Ns)N)", Py_TYPE(self), latin1, "latin-1", dict);
+}
+
+static PySequenceMethods bytes_as_sequence = {
+    (lenfunc)bytes_length,              /* sq_length */
+    (binaryfunc)PyByteArray_Concat,         /* sq_concat */
+    (ssizeargfunc)bytes_repeat,         /* sq_repeat */
+    (ssizeargfunc)bytes_getitem,        /* sq_item */
+    0,                                  /* sq_slice */
+    (ssizeobjargproc)bytes_setitem,     /* sq_ass_item */
+    0,                                  /* sq_ass_slice */
+    (objobjproc)bytes_contains,         /* sq_contains */
+    (binaryfunc)bytes_iconcat,          /* sq_inplace_concat */
+    (ssizeargfunc)bytes_irepeat,        /* sq_inplace_repeat */
+};
+
+static PyMappingMethods bytes_as_mapping = {
+    (lenfunc)bytes_length,
+    (binaryfunc)bytes_subscript,
+    (objobjargproc)bytes_ass_subscript,
+};
+
+static PyBufferProcs bytes_as_buffer = {
+    (getbufferproc)bytes_getbuffer,
+    (releasebufferproc)bytes_releasebuffer,
+};
+
+static PyMethodDef
+bytes_methods[] = {
+    {"__alloc__", (PyCFunction)bytes_alloc, METH_NOARGS, alloc_doc},
+    {"__reduce__", (PyCFunction)bytes_reduce, METH_NOARGS, reduce_doc},
+    {"append", (PyCFunction)bytes_append, METH_O, append__doc__},
+    {"capitalize", (PyCFunction)stringlib_capitalize, METH_NOARGS,
+     _Py_capitalize__doc__},
+    {"center", (PyCFunction)stringlib_center, METH_VARARGS, center__doc__},
+    {"count", (PyCFunction)bytes_count, METH_VARARGS, count__doc__},
+    {"decode", (PyCFunction)bytes_decode, METH_VARARGS, decode_doc},
+    {"endswith", (PyCFunction)bytes_endswith, METH_VARARGS, endswith__doc__},
+    {"expandtabs", (PyCFunction)stringlib_expandtabs, METH_VARARGS,
+     expandtabs__doc__},
+    {"extend", (PyCFunction)bytes_extend, METH_O, extend__doc__},
+    {"find", (PyCFunction)bytes_find, METH_VARARGS, find__doc__},
+    {"fromhex", (PyCFunction)bytes_fromhex, METH_VARARGS|METH_CLASS,
+     fromhex_doc},
+    {"index", (PyCFunction)bytes_index, METH_VARARGS, index__doc__},
+    {"insert", (PyCFunction)bytes_insert, METH_VARARGS, insert__doc__},
+    {"isalnum", (PyCFunction)stringlib_isalnum, METH_NOARGS,
+     _Py_isalnum__doc__},
+    {"isalpha", (PyCFunction)stringlib_isalpha, METH_NOARGS,
+     _Py_isalpha__doc__},
+    {"isdigit", (PyCFunction)stringlib_isdigit, METH_NOARGS,
+     _Py_isdigit__doc__},
+    {"islower", (PyCFunction)stringlib_islower, METH_NOARGS,
+     _Py_islower__doc__},
+    {"isspace", (PyCFunction)stringlib_isspace, METH_NOARGS,
+     _Py_isspace__doc__},
+    {"istitle", (PyCFunction)stringlib_istitle, METH_NOARGS,
+     _Py_istitle__doc__},
+    {"isupper", (PyCFunction)stringlib_isupper, METH_NOARGS,
+     _Py_isupper__doc__},
+    {"join", (PyCFunction)bytes_join, METH_O, join_doc},
+    {"ljust", (PyCFunction)stringlib_ljust, METH_VARARGS, ljust__doc__},
+    {"lower", (PyCFunction)stringlib_lower, METH_NOARGS, _Py_lower__doc__},
+    {"lstrip", (PyCFunction)bytes_lstrip, METH_VARARGS, lstrip__doc__},
+    {"partition", (PyCFunction)bytes_partition, METH_O, partition__doc__},
+    {"pop", (PyCFunction)bytes_pop, METH_VARARGS, pop__doc__},
+    {"remove", (PyCFunction)bytes_remove, METH_O, remove__doc__},
+    {"replace", (PyCFunction)bytes_replace, METH_VARARGS, replace__doc__},
+    {"reverse", (PyCFunction)bytes_reverse, METH_NOARGS, reverse__doc__},
+    {"rfind", (PyCFunction)bytes_rfind, METH_VARARGS, rfind__doc__},
+    {"rindex", (PyCFunction)bytes_rindex, METH_VARARGS, rindex__doc__},
+    {"rjust", (PyCFunction)stringlib_rjust, METH_VARARGS, rjust__doc__},
+    {"rpartition", (PyCFunction)bytes_rpartition, METH_O, rpartition__doc__},
+    {"rsplit", (PyCFunction)bytes_rsplit, METH_VARARGS, rsplit__doc__},
+    {"rstrip", (PyCFunction)bytes_rstrip, METH_VARARGS, rstrip__doc__},
+    {"split", (PyCFunction)bytes_split, METH_VARARGS, split__doc__},
+    {"splitlines", (PyCFunction)stringlib_splitlines, METH_VARARGS,
+     splitlines__doc__},
+    {"startswith", (PyCFunction)bytes_startswith, METH_VARARGS ,
+     startswith__doc__},
+    {"strip", (PyCFunction)bytes_strip, METH_VARARGS, strip__doc__},
+    {"swapcase", (PyCFunction)stringlib_swapcase, METH_NOARGS,
+     _Py_swapcase__doc__},
+    {"title", (PyCFunction)stringlib_title, METH_NOARGS, _Py_title__doc__},
+    {"translate", (PyCFunction)bytes_translate, METH_VARARGS,
+     translate__doc__},
+    {"upper", (PyCFunction)stringlib_upper, METH_NOARGS, _Py_upper__doc__},
+    {"zfill", (PyCFunction)stringlib_zfill, METH_VARARGS, zfill__doc__},
+    {NULL}
+};
+
+PyDoc_STRVAR(bytes_doc,
+"bytearray(iterable_of_ints) -> bytearray.\n\
+bytearray(string, encoding[, errors]) -> bytearray.\n\
+bytearray(bytes_or_bytearray) -> mutable copy of bytes_or_bytearray.\n\
+bytearray(memory_view) -> bytearray.\n\
+\n\
+Construct an mutable bytearray object from:\n\
+  - an iterable yielding integers in range(256)\n\
+  - a text string encoded using the specified encoding\n\
+  - a bytes or a bytearray object\n\
+  - any object implementing the buffer API.\n\
+\n\
+bytearray(int) -> bytearray.\n\
+\n\
+Construct a zero-initialized bytearray of the given length.");
+
+
+static PyObject *bytes_iter(PyObject *seq);
+
+PyTypeObject PyByteArray_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "bytearray",
+    sizeof(PyByteArrayObject),
+    0,
+    (destructor)bytes_dealloc,          /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    (reprfunc)bytes_repr,               /* tp_repr */
+    0,                                  /* tp_as_number */
+    &bytes_as_sequence,                 /* tp_as_sequence */
+    &bytes_as_mapping,                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    bytes_str,                          /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    &bytes_as_buffer,                   /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
+    bytes_doc,                          /* tp_doc */
+    0,                                  /* tp_traverse */
+    0,                                  /* tp_clear */
+    (richcmpfunc)bytes_richcompare,     /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    bytes_iter,                         /* tp_iter */
+    0,                                  /* tp_iternext */
+    bytes_methods,                      /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    (initproc)bytes_init,               /* tp_init */
+    PyType_GenericAlloc,                /* tp_alloc */
+    PyType_GenericNew,                  /* tp_new */
+    PyObject_Del,                       /* tp_free */
+};
+
+/*********************** Bytes Iterator ****************************/
+
+typedef struct {
+    PyObject_HEAD
+    Py_ssize_t it_index;
+    PyByteArrayObject *it_seq; /* Set to NULL when iterator is exhausted */
+} bytesiterobject;
+
+static void
+bytesiter_dealloc(bytesiterobject *it)
+{
+    _PyObject_GC_UNTRACK(it);
+    Py_XDECREF(it->it_seq);
+    PyObject_GC_Del(it);
+}
+
+static int
+bytesiter_traverse(bytesiterobject *it, visitproc visit, void *arg)
+{
+    Py_VISIT(it->it_seq);
+    return 0;
+}
+
+static PyObject *
+bytesiter_next(bytesiterobject *it)
+{
+    PyByteArrayObject *seq;
+    PyObject *item;
+
+    assert(it != NULL);
+    seq = it->it_seq;
+    if (seq == NULL)
+        return NULL;
+    assert(PyByteArray_Check(seq));
+
+    if (it->it_index < PyByteArray_GET_SIZE(seq)) {
+        item = PyLong_FromLong(
+            (unsigned char)seq->ob_bytes[it->it_index]);
+        if (item != NULL)
+            ++it->it_index;
+        return item;
+    }
+
+    Py_DECREF(seq);
+    it->it_seq = NULL;
+    return NULL;
+}
+
+static PyObject *
+bytesiter_length_hint(bytesiterobject *it)
+{
+    Py_ssize_t len = 0;
+    if (it->it_seq)
+        len = PyByteArray_GET_SIZE(it->it_seq) - it->it_index;
+    return PyLong_FromSsize_t(len);
+}
+
+PyDoc_STRVAR(length_hint_doc,
+    "Private method returning an estimate of len(list(it)).");
+
+static PyMethodDef bytesiter_methods[] = {
+    {"__length_hint__", (PyCFunction)bytesiter_length_hint, METH_NOARGS,
+     length_hint_doc},
+    {NULL, NULL} /* sentinel */
+};
+
+PyTypeObject PyByteArrayIter_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "bytearray_iterator",              /* tp_name */
+    sizeof(bytesiterobject),           /* tp_basicsize */
+    0,                                 /* tp_itemsize */
+    /* methods */
+    (destructor)bytesiter_dealloc,     /* tp_dealloc */
+    0,                                 /* tp_print */
+    0,                                 /* tp_getattr */
+    0,                                 /* tp_setattr */
+    0,                                 /* tp_compare */
+    0,                                 /* tp_repr */
+    0,                                 /* tp_as_number */
+    0,                                 /* tp_as_sequence */
+    0,                                 /* tp_as_mapping */
+    0,                                 /* tp_hash */
+    0,                                 /* tp_call */
+    0,                                 /* tp_str */
+    PyObject_GenericGetAttr,           /* tp_getattro */
+    0,                                 /* tp_setattro */
+    0,                                 /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
+    0,                                 /* tp_doc */
+    (traverseproc)bytesiter_traverse,  /* tp_traverse */
+    0,                                 /* tp_clear */
+    0,                                 /* tp_richcompare */
+    0,                                 /* tp_weaklistoffset */
+    PyObject_SelfIter,                 /* tp_iter */
+    (iternextfunc)bytesiter_next,      /* tp_iternext */
+    bytesiter_methods,                 /* tp_methods */
+    0,
+};
+
+static PyObject *
+bytes_iter(PyObject *seq)
+{
+    bytesiterobject *it;
+
+    if (!PyByteArray_Check(seq)) {
+        PyErr_BadInternalCall();
+        return NULL;
+    }
+    it = PyObject_GC_New(bytesiterobject, &PyByteArrayIter_Type);
+    if (it == NULL)
+        return NULL;
+    it->it_index = 0;
+    Py_INCREF(seq);
+    it->it_seq = (PyByteArrayObject *)seq;
+    _PyObject_GC_TRACK(it);
+    return (PyObject *)it;
+}
diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index 0a83725..b9ba73f 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -1,79 +1,13 @@
-/* PyByteArray (bytearray) implementation */
+/* String object implementation */
 
-#define PY_SSIZE_T_CLEAN
-#include "Python.h"
-#include "structmember.h"
-#include "bytes_methods.h"
-
-static PyByteArrayObject *nullbytes = NULL;
-
-void
-PyByteArray_Fini(void)
-{
-    Py_CLEAR(nullbytes);
-}
-
-int
-PyByteArray_Init(void)
-{
-    nullbytes = PyObject_New(PyByteArrayObject, &PyByteArray_Type);
-    if (nullbytes == NULL)
-        return 0;
-    nullbytes->ob_bytes = NULL;
-    Py_SIZE(nullbytes) = nullbytes->ob_alloc = 0;
-    nullbytes->ob_exports = 0;
-    return 1;
-}
-
-/* end nullbytes support */
-
-/* Helpers */
+/* XXX This is now called 'bytes' as far as the user is concerned.
+   Many docstrings and error messages need to be cleaned up. */
 
-static int
-_getbytevalue(PyObject* arg, int *value)
-{
-    long face_value;
-
-    if (PyLong_Check(arg)) {
-        face_value = PyLong_AsLong(arg);
-        if (face_value < 0 || face_value >= 256) {
-            PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
-            return 0;
-        }
-    } else {
-        PyErr_Format(PyExc_TypeError, "an integer is required");
-        return 0;
-    }
-
-    *value = face_value;
-    return 1;
-}
+#define PY_SSIZE_T_CLEAN
 
-static int
-bytes_getbuffer(PyByteArrayObject *obj, Py_buffer *view, int flags)
-{
-    int ret;
-    void *ptr;
-    if (view == NULL) {
-        obj->ob_exports++;
-        return 0;
-    }
-    if (obj->ob_bytes == NULL)
-        ptr = "";
-    else
-        ptr = obj->ob_bytes;
-    ret = PyBuffer_FillInfo(view, ptr, Py_SIZE(obj), 0, flags);
-    if (ret >= 0) {
-        obj->ob_exports++;
-    }
-    return ret;
-}
+#include "Python.h"
 
-static void
-bytes_releasebuffer(PyByteArrayObject *obj, Py_buffer *view)
-{
-    obj->ob_exports--;
-}
+#include "bytes_methods.h"
 
 static Py_ssize_t
 _getbuffer(PyObject *obj, Py_buffer *view)
@@ -93,1253 +27,1809 @@ _getbuffer(PyObject *obj, Py_buffer *view)
     return view->len;
 }
 
-/* Direct API functions */
+#ifdef COUNT_ALLOCS
+int null_strings, one_strings;
+#endif
 
+static PyBytesObject *characters[UCHAR_MAX + 1];
+static PyBytesObject *nullstring;
+
+/*
+   For both PyBytes_FromString() and PyBytes_FromStringAndSize(), the
+   parameter `size' denotes number of characters to allocate, not counting any
+   null terminating character.
+
+   For PyBytes_FromString(), the parameter `str' points to a null-terminated
+   string containing exactly `size' bytes.
+
+   For PyBytes_FromStringAndSize(), the parameter the parameter `str' is
+   either NULL or else points to a string containing at least `size' bytes.
+   For PyBytes_FromStringAndSize(), the string in the `str' parameter does
+   not have to be null-terminated.  (Therefore it is safe to construct a
+   substring by calling `PyBytes_FromStringAndSize(origstring, substrlen)'.)
+   If `str' is NULL then PyBytes_FromStringAndSize() will allocate `size+1'
+   bytes (setting the last byte to the null terminating character) and you can
+   fill in the data yourself.  If `str' is non-NULL then the resulting
+   PyString object must be treated as immutable and you must not fill in nor
+   alter the data yourself, since the strings may be shared.
+
+   The PyObject member `op->ob_size', which denotes the number of "extra
+   items" in a variable-size object, will contain the number of bytes
+   allocated for string data, not counting the null terminating character.  It
+   is therefore equal to the equal to the `size' parameter (for
+   PyBytes_FromStringAndSize()) or the length of the string in the `str'
+   parameter (for PyBytes_FromString()).
+*/
 PyObject *
-PyByteArray_FromObject(PyObject *input)
+PyBytes_FromStringAndSize(const char *str, Py_ssize_t size)
 {
-    return PyObject_CallFunctionObjArgs((PyObject *)&PyByteArray_Type,
-                                        input, NULL);
+	register PyBytesObject *op;
+	if (size < 0) {
+		PyErr_SetString(PyExc_SystemError,
+		    "Negative size passed to PyBytes_FromStringAndSize");
+		return NULL;
+	}
+	if (size == 0 && (op = nullstring) != NULL) {
+#ifdef COUNT_ALLOCS
+		null_strings++;
+#endif
+		Py_INCREF(op);
+		return (PyObject *)op;
+	}
+	if (size == 1 && str != NULL &&
+	    (op = characters[*str & UCHAR_MAX]) != NULL)
+	{
+#ifdef COUNT_ALLOCS
+		one_strings++;
+#endif
+		Py_INCREF(op);
+		return (PyObject *)op;
+	}
+
+	/* Inline PyObject_NewVar */
+	op = (PyBytesObject *)PyObject_MALLOC(sizeof(PyBytesObject) + size);
+	if (op == NULL)
+		return PyErr_NoMemory();
+	PyObject_INIT_VAR(op, &PyBytes_Type, size);
+	op->ob_shash = -1;
+	if (str != NULL)
+		Py_MEMCPY(op->ob_sval, str, size);
+	op->ob_sval[size] = '\0';
+	/* share short strings */
+	if (size == 0) {
+		nullstring = op;
+		Py_INCREF(op);
+	} else if (size == 1 && str != NULL) {
+		characters[*str & UCHAR_MAX] = op;
+		Py_INCREF(op);
+	}
+	return (PyObject *) op;
 }
 
 PyObject *
-PyByteArray_FromStringAndSize(const char *bytes, Py_ssize_t size)
+PyBytes_FromString(const char *str)
 {
-    PyByteArrayObject *new;
-    Py_ssize_t alloc;
+	register size_t size;
+	register PyBytesObject *op;
 
-    if (size < 0) {
-        PyErr_SetString(PyExc_SystemError,
-            "Negative size passed to PyByteArray_FromStringAndSize");
-        return NULL;
-    }
+	assert(str != NULL);
+	size = strlen(str);
+	if (size > PY_SSIZE_T_MAX) {
+		PyErr_SetString(PyExc_OverflowError,
+			"string is too long for a Python string");
+		return NULL;
+	}
+	if (size == 0 && (op = nullstring) != NULL) {
+#ifdef COUNT_ALLOCS
+		null_strings++;
+#endif
+		Py_INCREF(op);
+		return (PyObject *)op;
+	}
+	if (size == 1 && (op = characters[*str & UCHAR_MAX]) != NULL) {
+#ifdef COUNT_ALLOCS
+		one_strings++;
+#endif
+		Py_INCREF(op);
+		return (PyObject *)op;
+	}
 
-    new = PyObject_New(PyByteArrayObject, &PyByteArray_Type);
-    if (new == NULL)
-        return NULL;
+	/* Inline PyObject_NewVar */
+	op = (PyBytesObject *)PyObject_MALLOC(sizeof(PyBytesObject) + size);
+	if (op == NULL)
+		return PyErr_NoMemory();
+	PyObject_INIT_VAR(op, &PyBytes_Type, size);
+	op->ob_shash = -1;
+	Py_MEMCPY(op->ob_sval, str, size+1);
+	/* share short strings */
+	if (size == 0) {
+		nullstring = op;
+		Py_INCREF(op);
+	} else if (size == 1) {
+		characters[*str & UCHAR_MAX] = op;
+		Py_INCREF(op);
+	}
+	return (PyObject *) op;
+}
 
-    if (size == 0) {
-        new->ob_bytes = NULL;
-        alloc = 0;
-    }
-    else {
-        alloc = size + 1;
-        new->ob_bytes = PyMem_Malloc(alloc);
-        if (new->ob_bytes == NULL) {
-            Py_DECREF(new);
-            return PyErr_NoMemory();
-        }
-        if (bytes != NULL)
-            memcpy(new->ob_bytes, bytes, size);
-        new->ob_bytes[size] = '\0';  /* Trailing null byte */
-    }
-    Py_SIZE(new) = size;
-    new->ob_alloc = alloc;
-    new->ob_exports = 0;
+PyObject *
+PyBytes_FromFormatV(const char *format, va_list vargs)
+{
+	va_list count;
+	Py_ssize_t n = 0;
+	const char* f;
+	char *s;
+	PyObject* string;
 
-    return (PyObject *)new;
+#ifdef VA_LIST_IS_ARRAY
+	Py_MEMCPY(count, vargs, sizeof(va_list));
+#else
+#ifdef  __va_copy
+	__va_copy(count, vargs);
+#else
+	count = vargs;
+#endif
+#endif
+	/* step 1: figure out how large a buffer we need */
+	for (f = format; *f; f++) {
+		if (*f == '%') {
+			const char* p = f;
+			while (*++f && *f != '%' && !ISALPHA(*f))
+				;
+
+			/* skip the 'l' or 'z' in {%ld, %zd, %lu, %zu} since
+			 * they don't affect the amount of space we reserve.
+			 */
+			if ((*f == 'l' || *f == 'z') &&
+					(f[1] == 'd' || f[1] == 'u'))
+				++f;
+
+			switch (*f) {
+			case 'c':
+				(void)va_arg(count, int);
+				/* fall through... */
+			case '%':
+				n++;
+				break;
+			case 'd': case 'u': case 'i': case 'x':
+				(void) va_arg(count, int);
+				/* 20 bytes is enough to hold a 64-bit
+				   integer.  Decimal takes the most space.
+				   This isn't enough for octal. */
+				n += 20;
+				break;
+			case 's':
+				s = va_arg(count, char*);
+				n += strlen(s);
+				break;
+			case 'p':
+				(void) va_arg(count, int);
+				/* maximum 64-bit pointer representation:
+				 * 0xffffffffffffffff
+				 * so 19 characters is enough.
+				 * XXX I count 18 -- what's the extra for?
+				 */
+				n += 19;
+				break;
+			default:
+				/* if we stumble upon an unknown
+				   formatting code, copy the rest of
+				   the format string to the output
+				   string. (we cannot just skip the
+				   code, since there's no way to know
+				   what's in the argument list) */
+				n += strlen(p);
+				goto expand;
+			}
+		} else
+			n++;
+	}
+ expand:
+	/* step 2: fill the buffer */
+	/* Since we've analyzed how much space we need for the worst case,
+	   use sprintf directly instead of the slower PyOS_snprintf. */
+	string = PyBytes_FromStringAndSize(NULL, n);
+	if (!string)
+		return NULL;
+
+	s = PyBytes_AsString(string);
+
+	for (f = format; *f; f++) {
+		if (*f == '%') {
+			const char* p = f++;
+			Py_ssize_t i;
+			int longflag = 0;
+			int size_tflag = 0;
+			/* parse the width.precision part (we're only
+			   interested in the precision value, if any) */
+			n = 0;
+			while (ISDIGIT(*f))
+				n = (n*10) + *f++ - '0';
+			if (*f == '.') {
+				f++;
+				n = 0;
+				while (ISDIGIT(*f))
+					n = (n*10) + *f++ - '0';
+			}
+			while (*f && *f != '%' && !ISALPHA(*f))
+				f++;
+			/* handle the long flag, but only for %ld and %lu.
+			   others can be added when necessary. */
+			if (*f == 'l' && (f[1] == 'd' || f[1] == 'u')) {
+				longflag = 1;
+				++f;
+			}
+			/* handle the size_t flag. */
+			if (*f == 'z' && (f[1] == 'd' || f[1] == 'u')) {
+				size_tflag = 1;
+				++f;
+			}
+
+			switch (*f) {
+			case 'c':
+				*s++ = va_arg(vargs, int);
+				break;
+			case 'd':
+				if (longflag)
+					sprintf(s, "%ld", va_arg(vargs, long));
+				else if (size_tflag)
+					sprintf(s, "%" PY_FORMAT_SIZE_T "d",
+					        va_arg(vargs, Py_ssize_t));
+				else
+					sprintf(s, "%d", va_arg(vargs, int));
+				s += strlen(s);
+				break;
+			case 'u':
+				if (longflag)
+					sprintf(s, "%lu",
+						va_arg(vargs, unsigned long));
+				else if (size_tflag)
+					sprintf(s, "%" PY_FORMAT_SIZE_T "u",
+					        va_arg(vargs, size_t));
+				else
+					sprintf(s, "%u",
+						va_arg(vargs, unsigned int));
+				s += strlen(s);
+				break;
+			case 'i':
+				sprintf(s, "%i", va_arg(vargs, int));
+				s += strlen(s);
+				break;
+			case 'x':
+				sprintf(s, "%x", va_arg(vargs, int));
+				s += strlen(s);
+				break;
+			case 's':
+				p = va_arg(vargs, char*);
+				i = strlen(p);
+				if (n > 0 && i > n)
+					i = n;
+				Py_MEMCPY(s, p, i);
+				s += i;
+				break;
+			case 'p':
+				sprintf(s, "%p", va_arg(vargs, void*));
+				/* %p is ill-defined:  ensure leading 0x. */
+				if (s[1] == 'X')
+					s[1] = 'x';
+				else if (s[1] != 'x') {
+					memmove(s+2, s, strlen(s)+1);
+					s[0] = '0';
+					s[1] = 'x';
+				}
+				s += strlen(s);
+				break;
+			case '%':
+				*s++ = '%';
+				break;
+			default:
+				strcpy(s, p);
+				s += strlen(s);
+				goto end;
+			}
+		} else
+			*s++ = *f;
+	}
+
+ end:
+	_PyBytes_Resize(&string, s - PyBytes_AS_STRING(string));
+	return string;
 }
 
-Py_ssize_t
-PyByteArray_Size(PyObject *self)
+PyObject *
+PyBytes_FromFormat(const char *format, ...)
 {
-    assert(self != NULL);
-    assert(PyByteArray_Check(self));
+	PyObject* ret;
+	va_list vargs;
+
+#ifdef HAVE_STDARG_PROTOTYPES
+	va_start(vargs, format);
+#else
+	va_start(vargs);
+#endif
+	ret = PyBytes_FromFormatV(format, vargs);
+	va_end(vargs);
+	return ret;
+}
 
-    return PyByteArray_GET_SIZE(self);
+static void
+string_dealloc(PyObject *op)
+{
+	Py_TYPE(op)->tp_free(op);
+}
+
+/* Unescape a backslash-escaped string. If unicode is non-zero,
+   the string is a u-literal. If recode_encoding is non-zero,
+   the string is UTF-8 encoded and should be re-encoded in the
+   specified encoding.  */
+
+PyObject *PyBytes_DecodeEscape(const char *s,
+				Py_ssize_t len,
+				const char *errors,
+				Py_ssize_t unicode,
+				const char *recode_encoding)
+{
+	int c;
+	char *p, *buf;
+	const char *end;
+	PyObject *v;
+	Py_ssize_t newlen = recode_encoding ? 4*len:len;
+	v = PyBytes_FromStringAndSize((char *)NULL, newlen);
+	if (v == NULL)
+		return NULL;
+	p = buf = PyBytes_AsString(v);
+	end = s + len;
+	while (s < end) {
+		if (*s != '\\') {
+		  non_esc:
+			if (recode_encoding && (*s & 0x80)) {
+				PyObject *u, *w;
+				char *r;
+				const char* t;
+				Py_ssize_t rn;
+				t = s;
+				/* Decode non-ASCII bytes as UTF-8. */
+				while (t < end && (*t & 0x80)) t++;
+				u = PyUnicode_DecodeUTF8(s, t - s, errors);
+				if(!u) goto failed;
+
+				/* Recode them in target encoding. */
+				w = PyUnicode_AsEncodedString(
+					u, recode_encoding, errors);
+				Py_DECREF(u);
+				if (!w)	goto failed;
+
+				/* Append bytes to output buffer. */
+				assert(PyBytes_Check(w));
+				r = PyBytes_AS_STRING(w);
+				rn = PyBytes_GET_SIZE(w);
+				Py_MEMCPY(p, r, rn);
+				p += rn;
+				Py_DECREF(w);
+				s = t;
+			} else {
+				*p++ = *s++;
+			}
+			continue;
+		}
+		s++;
+		if (s==end) {
+			PyErr_SetString(PyExc_ValueError,
+					"Trailing \\ in string");
+			goto failed;
+		}
+		switch (*s++) {
+		/* XXX This assumes ASCII! */
+		case '\n': break;
+		case '\\': *p++ = '\\'; break;
+		case '\'': *p++ = '\''; break;
+		case '\"': *p++ = '\"'; break;
+		case 'b': *p++ = '\b'; break;
+		case 'f': *p++ = '\014'; break; /* FF */
+		case 't': *p++ = '\t'; break;
+		case 'n': *p++ = '\n'; break;
+		case 'r': *p++ = '\r'; break;
+		case 'v': *p++ = '\013'; break; /* VT */
+		case 'a': *p++ = '\007'; break; /* BEL, not classic C */
+		case '0': case '1': case '2': case '3':
+		case '4': case '5': case '6': case '7':
+			c = s[-1] - '0';
+			if (s < end && '0' <= *s && *s <= '7') {
+				c = (c<<3) + *s++ - '0';
+				if (s < end && '0' <= *s && *s <= '7')
+					c = (c<<3) + *s++ - '0';
+			}
+			*p++ = c;
+			break;
+		case 'x':
+			if (s+1 < end && ISXDIGIT(s[0]) && ISXDIGIT(s[1])) {
+				unsigned int x = 0;
+				c = Py_CHARMASK(*s);
+				s++;
+				if (ISDIGIT(c))
+					x = c - '0';
+				else if (ISLOWER(c))
+					x = 10 + c - 'a';
+				else
+					x = 10 + c - 'A';
+				x = x << 4;
+				c = Py_CHARMASK(*s);
+				s++;
+				if (ISDIGIT(c))
+					x += c - '0';
+				else if (ISLOWER(c))
+					x += 10 + c - 'a';
+				else
+					x += 10 + c - 'A';
+				*p++ = x;
+				break;
+			}
+			if (!errors || strcmp(errors, "strict") == 0) {
+				PyErr_SetString(PyExc_ValueError,
+						"invalid \\x escape");
+				goto failed;
+			}
+			if (strcmp(errors, "replace") == 0) {
+				*p++ = '?';
+			} else if (strcmp(errors, "ignore") == 0)
+				/* do nothing */;
+			else {
+				PyErr_Format(PyExc_ValueError,
+					     "decoding error; unknown "
+					     "error handling code: %.400s",
+					     errors);
+				goto failed;
+			}
+		default:
+			*p++ = '\\';
+			s--;
+			goto non_esc; /* an arbitry number of unescaped
+					 UTF-8 bytes may follow. */
+		}
+	}
+	if (p-buf < newlen)
+		_PyBytes_Resize(&v, p - buf);
+	return v;
+  failed:
+	Py_DECREF(v);
+	return NULL;
 }
 
-char  *
-PyByteArray_AsString(PyObject *self)
+/* -------------------------------------------------------------------- */
+/* object api */
+
+Py_ssize_t
+PyBytes_Size(register PyObject *op)
 {
-    assert(self != NULL);
-    assert(PyByteArray_Check(self));
+	if (!PyBytes_Check(op)) {
+		PyErr_Format(PyExc_TypeError,
+		     "expected bytes, %.200s found", Py_TYPE(op)->tp_name);
+		return -1;
+	}
+	return Py_SIZE(op);
+}
 
-    return PyByteArray_AS_STRING(self);
+char *
+PyBytes_AsString(register PyObject *op)
+{
+	if (!PyBytes_Check(op)) {
+		PyErr_Format(PyExc_TypeError,
+		     "expected bytes, %.200s found", Py_TYPE(op)->tp_name);
+		return NULL;
+	}
+	return ((PyBytesObject *)op)->ob_sval;
 }
 
 int
-PyByteArray_Resize(PyObject *self, Py_ssize_t size)
+PyBytes_AsStringAndSize(register PyObject *obj,
+			 register char **s,
+			 register Py_ssize_t *len)
 {
-    void *sval;
-    Py_ssize_t alloc = ((PyByteArrayObject *)self)->ob_alloc;
+	if (s == NULL) {
+		PyErr_BadInternalCall();
+		return -1;
+	}
 
-    assert(self != NULL);
-    assert(PyByteArray_Check(self));
-    assert(size >= 0);
+	if (!PyBytes_Check(obj)) {
+		PyErr_Format(PyExc_TypeError,
+		     "expected bytes, %.200s found", Py_TYPE(obj)->tp_name);
+		return -1;
+	}
 
-    if (size < alloc / 2) {
-        /* Major downsize; resize down to exact size */
-        alloc = size + 1;
-    }
-    else if (size < alloc) {
-        /* Within allocated size; quick exit */
-        Py_SIZE(self) = size;
-        ((PyByteArrayObject *)self)->ob_bytes[size] = '\0'; /* Trailing null */
-        return 0;
-    }
-    else if (size <= alloc * 1.125) {
-        /* Moderate upsize; overallocate similar to list_resize() */
-        alloc = size + (size >> 3) + (size < 9 ? 3 : 6);
-    }
-    else {
-        /* Major upsize; resize up to exact size */
-        alloc = size + 1;
-    }
+	*s = PyBytes_AS_STRING(obj);
+	if (len != NULL)
+		*len = PyBytes_GET_SIZE(obj);
+	else if (strlen(*s) != (size_t)PyBytes_GET_SIZE(obj)) {
+		PyErr_SetString(PyExc_TypeError,
+				"expected bytes with no null");
+		return -1;
+	}
+	return 0;
+}
 
-    if (((PyByteArrayObject *)self)->ob_exports > 0) {
-            /*
-            fprintf(stderr, "%d: %s", ((PyByteArrayObject *)self)->ob_exports,
-                    ((PyByteArrayObject *)self)->ob_bytes);
-            */
-            PyErr_SetString(PyExc_BufferError,
-                    "Existing exports of data: object cannot be re-sized");
-            return -1;
-    }
+/* -------------------------------------------------------------------- */
+/* Methods */
 
-    sval = PyMem_Realloc(((PyByteArrayObject *)self)->ob_bytes, alloc);
-    if (sval == NULL) {
-        PyErr_NoMemory();
-        return -1;
-    }
+#define STRINGLIB_CHAR char
 
-    ((PyByteArrayObject *)self)->ob_bytes = sval;
-    Py_SIZE(self) = size;
-    ((PyByteArrayObject *)self)->ob_alloc = alloc;
-    ((PyByteArrayObject *)self)->ob_bytes[size] = '\0'; /* Trailing null byte */
+#define STRINGLIB_CMP memcmp
+#define STRINGLIB_LEN PyBytes_GET_SIZE
+#define STRINGLIB_NEW PyBytes_FromStringAndSize
+#define STRINGLIB_STR PyBytes_AS_STRING
+/* #define STRINGLIB_WANT_CONTAINS_OBJ 1 */
 
-    return 0;
-}
+#define STRINGLIB_EMPTY nullstring
+#define STRINGLIB_CHECK_EXACT PyBytes_CheckExact
+#define STRINGLIB_MUTABLE 0
 
-PyObject *
-PyByteArray_Concat(PyObject *a, PyObject *b)
-{
-    Py_ssize_t size;
-    Py_buffer va, vb;
-    PyByteArrayObject *result = NULL;
-
-    va.len = -1;
-    vb.len = -1;
-    if (_getbuffer(a, &va) < 0  ||
-        _getbuffer(b, &vb) < 0) {
-            PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
-                         Py_TYPE(a)->tp_name, Py_TYPE(b)->tp_name);
-            goto done;
-    }
+#include "stringlib/fastsearch.h"
 
-    size = va.len + vb.len;
-    if (size < 0) {
-            return PyErr_NoMemory();
-            goto done;
-    }
+#include "stringlib/count.h"
+#include "stringlib/find.h"
+#include "stringlib/partition.h"
+#include "stringlib/ctype.h"
+#include "stringlib/transmogrify.h"
 
-    result = (PyByteArrayObject *) PyByteArray_FromStringAndSize(NULL, size);
-    if (result != NULL) {
-        memcpy(result->ob_bytes, va.buf, va.len);
-        memcpy(result->ob_bytes + va.len, vb.buf, vb.len);
-    }
+#define _Py_InsertThousandsGrouping _PyBytes_InsertThousandsGrouping
+#include "stringlib/localeutil.h"
 
-  done:
-    if (va.len != -1)
-        PyObject_ReleaseBuffer(a, &va);
-    if (vb.len != -1)
-        PyObject_ReleaseBuffer(b, &vb);
-    return (PyObject *)result;
+PyObject *
+PyBytes_Repr(PyObject *obj, int smartquotes)
+{
+	static const char *hexdigits = "0123456789abcdef";
+	register PyBytesObject* op = (PyBytesObject*) obj;
+	Py_ssize_t length = Py_SIZE(op);
+	size_t newsize = 3 + 4 * length;
+	PyObject *v;
+	if (newsize > PY_SSIZE_T_MAX || (newsize-3) / 4 != length) {
+		PyErr_SetString(PyExc_OverflowError,
+			"bytes object is too large to make repr");
+                return NULL;
+	}
+	v = PyUnicode_FromUnicode(NULL, newsize);
+	if (v == NULL) {
+		return NULL;
+	}
+	else {
+		register Py_ssize_t i;
+		register Py_UNICODE c;
+		register Py_UNICODE *p = PyUnicode_AS_UNICODE(v);
+		int quote;
+
+		/* Figure out which quote to use; single is preferred */
+		quote = '\'';
+		if (smartquotes) {
+			char *test, *start;
+			start = PyBytes_AS_STRING(op);
+			for (test = start; test < start+length; ++test) {
+				if (*test == '"') {
+					quote = '\''; /* back to single */
+					goto decided;
+				}
+				else if (*test == '\'')
+					quote = '"';
+			}
+			decided:
+			;
+		}
+
+		*p++ = 'b', *p++ = quote;
+		for (i = 0; i < length; i++) {
+			/* There's at least enough room for a hex escape
+			   and a closing quote. */
+			assert(newsize - (p - PyUnicode_AS_UNICODE(v)) >= 5);
+			c = op->ob_sval[i];
+			if (c == quote || c == '\\')
+				*p++ = '\\', *p++ = c;
+			else if (c == '\t')
+				*p++ = '\\', *p++ = 't';
+			else if (c == '\n')
+				*p++ = '\\', *p++ = 'n';
+			else if (c == '\r')
+				*p++ = '\\', *p++ = 'r';
+			else if (c < ' ' || c >= 0x7f) {
+				*p++ = '\\';
+				*p++ = 'x';
+				*p++ = hexdigits[(c & 0xf0) >> 4];
+				*p++ = hexdigits[c & 0xf];
+			}
+			else
+				*p++ = c;
+		}
+		assert(newsize - (p - PyUnicode_AS_UNICODE(v)) >= 1);
+		*p++ = quote;
+		*p = '\0';
+		if (PyUnicode_Resize(&v, (p - PyUnicode_AS_UNICODE(v)))) {
+			Py_DECREF(v);
+			return NULL;
+		}
+		return v;
+	}
+}
+
+static PyObject *
+string_repr(PyObject *op)
+{
+	return PyBytes_Repr(op, 1);
 }
 
-/* Functions stuffed into the type object */
+static PyObject *
+string_str(PyObject *op)
+{
+	if (Py_BytesWarningFlag) {
+		if (PyErr_WarnEx(PyExc_BytesWarning,
+				 "str() on a bytes instance", 1))
+			return NULL;
+	}
+	return string_repr(op);
+}
 
 static Py_ssize_t
-bytes_length(PyByteArrayObject *self)
+string_length(PyBytesObject *a)
 {
-    return Py_SIZE(self);
+	return Py_SIZE(a);
 }
 
+/* This is also used by PyBytes_Concat() */
 static PyObject *
-bytes_iconcat(PyByteArrayObject *self, PyObject *other)
-{
-    Py_ssize_t mysize;
-    Py_ssize_t size;
-    Py_buffer vo;
+string_concat(PyObject *a, PyObject *b)
+{
+	Py_ssize_t size;
+	Py_buffer va, vb;
+	PyObject *result = NULL;
+
+	va.len = -1;
+	vb.len = -1;
+	if (_getbuffer(a, &va) < 0  ||
+	    _getbuffer(b, &vb) < 0) {
+		PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
+			     Py_TYPE(a)->tp_name, Py_TYPE(b)->tp_name);
+		goto done;
+	}
 
-    if (_getbuffer(other, &vo) < 0) {
-        PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
-                     Py_TYPE(other)->tp_name, Py_TYPE(self)->tp_name);
-        return NULL;
-    }
+	/* Optimize end cases */
+	if (va.len == 0 && PyBytes_CheckExact(b)) {
+		result = b;
+		Py_INCREF(result);
+		goto done;
+	}
+	if (vb.len == 0 && PyBytes_CheckExact(a)) {
+		result = a;
+		Py_INCREF(result);
+		goto done;
+	}
 
-    mysize = Py_SIZE(self);
-    size = mysize + vo.len;
-    if (size < 0) {
-        PyObject_ReleaseBuffer(other, &vo);
-        return PyErr_NoMemory();
-    }
-    if (size < self->ob_alloc) {
-        Py_SIZE(self) = size;
-        self->ob_bytes[Py_SIZE(self)] = '\0'; /* Trailing null byte */
-    }
-    else if (PyByteArray_Resize((PyObject *)self, size) < 0) {
-        PyObject_ReleaseBuffer(other, &vo);
-        return NULL;
-    }
-    memcpy(self->ob_bytes + mysize, vo.buf, vo.len);
-    PyObject_ReleaseBuffer(other, &vo);
-    Py_INCREF(self);
-    return (PyObject *)self;
+	size = va.len + vb.len;
+	if (size < 0) {
+		PyErr_NoMemory();
+		goto done;
+	}
+
+	result = PyBytes_FromStringAndSize(NULL, size);
+	if (result != NULL) {
+		memcpy(PyBytes_AS_STRING(result), va.buf, va.len);
+		memcpy(PyBytes_AS_STRING(result) + va.len, vb.buf, vb.len);
+	}
+
+  done:
+	if (va.len != -1)
+		PyObject_ReleaseBuffer(a, &va);
+	if (vb.len != -1)
+		PyObject_ReleaseBuffer(b, &vb);
+	return result;
 }
 
 static PyObject *
-bytes_repeat(PyByteArrayObject *self, Py_ssize_t count)
-{
-    PyByteArrayObject *result;
-    Py_ssize_t mysize;
-    Py_ssize_t size;
-
-    if (count < 0)
-        count = 0;
-    mysize = Py_SIZE(self);
-    size = mysize * count;
-    if (count != 0 && size / count != mysize)
-        return PyErr_NoMemory();
-    result = (PyByteArrayObject *)PyByteArray_FromStringAndSize(NULL, size);
-    if (result != NULL && size != 0) {
-        if (mysize == 1)
-            memset(result->ob_bytes, self->ob_bytes[0], size);
-        else {
-            Py_ssize_t i;
-            for (i = 0; i < count; i++)
-                memcpy(result->ob_bytes + i*mysize, self->ob_bytes, mysize);
-        }
-    }
-    return (PyObject *)result;
+string_repeat(register PyBytesObject *a, register Py_ssize_t n)
+{
+	register Py_ssize_t i;
+	register Py_ssize_t j;
+	register Py_ssize_t size;
+	register PyBytesObject *op;
+	size_t nbytes;
+	if (n < 0)
+		n = 0;
+	/* watch out for overflows:  the size can overflow int,
+	 * and the # of bytes needed can overflow size_t
+	 */
+	size = Py_SIZE(a) * n;
+	if (n && size / n != Py_SIZE(a)) {
+		PyErr_SetString(PyExc_OverflowError,
+			"repeated string is too long");
+		return NULL;
+	}
+	if (size == Py_SIZE(a) && PyBytes_CheckExact(a)) {
+		Py_INCREF(a);
+		return (PyObject *)a;
+	}
+	nbytes = (size_t)size;
+	if (nbytes + sizeof(PyBytesObject) <= nbytes) {
+		PyErr_SetString(PyExc_OverflowError,
+			"repeated string is too long");
+		return NULL;
+	}
+	op = (PyBytesObject *)
+		PyObject_MALLOC(sizeof(PyBytesObject) + nbytes);
+	if (op == NULL)
+		return PyErr_NoMemory();
+	PyObject_INIT_VAR(op, &PyBytes_Type, size);
+	op->ob_shash = -1;
+	op->ob_sval[size] = '\0';
+	if (Py_SIZE(a) == 1 && n > 0) {
+		memset(op->ob_sval, a->ob_sval[0] , n);
+		return (PyObject *) op;
+	}
+	i = 0;
+	if (i < size) {
+		Py_MEMCPY(op->ob_sval, a->ob_sval, Py_SIZE(a));
+		i = Py_SIZE(a);
+	}
+	while (i < size) {
+		j = (i <= size-i)  ?  i  :  size-i;
+		Py_MEMCPY(op->ob_sval+i, op->ob_sval, j);
+		i += j;
+	}
+	return (PyObject *) op;
 }
 
-static PyObject *
-bytes_irepeat(PyByteArrayObject *self, Py_ssize_t count)
-{
-    Py_ssize_t mysize;
-    Py_ssize_t size;
-
-    if (count < 0)
-        count = 0;
-    mysize = Py_SIZE(self);
-    size = mysize * count;
-    if (count != 0 && size / count != mysize)
-        return PyErr_NoMemory();
-    if (size < self->ob_alloc) {
-        Py_SIZE(self) = size;
-        self->ob_bytes[Py_SIZE(self)] = '\0'; /* Trailing null byte */
+static int
+string_contains(PyObject *self, PyObject *arg)
+{
+    Py_ssize_t ival = PyNumber_AsSsize_t(arg, PyExc_ValueError);
+    if (ival == -1 && PyErr_Occurred()) {
+        Py_buffer varg;
+        int pos;
+        PyErr_Clear();
+        if (_getbuffer(arg, &varg) < 0)
+            return -1;
+        pos = stringlib_find(PyBytes_AS_STRING(self), Py_SIZE(self),
+                             varg.buf, varg.len, 0);
+        PyObject_ReleaseBuffer(arg, &varg);
+        return pos >= 0;
     }
-    else if (PyByteArray_Resize((PyObject *)self, size) < 0)
-        return NULL;
-
-    if (mysize == 1)
-        memset(self->ob_bytes, self->ob_bytes[0], size);
-    else {
-        Py_ssize_t i;
-        for (i = 1; i < count; i++)
-            memcpy(self->ob_bytes + i*mysize, self->ob_bytes, mysize);
+    if (ival < 0 || ival >= 256) {
+        PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
+        return -1;
     }
 
-    Py_INCREF(self);
-    return (PyObject *)self;
+    return memchr(PyBytes_AS_STRING(self), ival, Py_SIZE(self)) != NULL;
 }
 
 static PyObject *
-bytes_getitem(PyByteArrayObject *self, Py_ssize_t i)
+string_item(PyBytesObject *a, register Py_ssize_t i)
 {
-    if (i < 0)
-        i += Py_SIZE(self);
-    if (i < 0 || i >= Py_SIZE(self)) {
-        PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
-        return NULL;
-    }
-    return PyLong_FromLong((unsigned char)(self->ob_bytes[i]));
+	if (i < 0 || i >= Py_SIZE(a)) {
+		PyErr_SetString(PyExc_IndexError, "string index out of range");
+		return NULL;
+	}
+	return PyLong_FromLong((unsigned char)a->ob_sval[i]);
+}
+
+static PyObject*
+string_richcompare(PyBytesObject *a, PyBytesObject *b, int op)
+{
+	int c;
+	Py_ssize_t len_a, len_b;
+	Py_ssize_t min_len;
+	PyObject *result;
+
+	/* Make sure both arguments are strings. */
+	if (!(PyBytes_Check(a) && PyBytes_Check(b))) {
+		if (Py_BytesWarningFlag && (op == Py_EQ) &&
+		    (PyObject_IsInstance((PyObject*)a,
+					 (PyObject*)&PyUnicode_Type) ||
+		    PyObject_IsInstance((PyObject*)b,
+					 (PyObject*)&PyUnicode_Type))) {
+			if (PyErr_WarnEx(PyExc_BytesWarning,
+				    "Comparsion between bytes and string", 1))
+				return NULL;
+		}
+		result = Py_NotImplemented;
+		goto out;
+	}
+	if (a == b) {
+		switch (op) {
+		case Py_EQ:case Py_LE:case Py_GE:
+			result = Py_True;
+			goto out;
+		case Py_NE:case Py_LT:case Py_GT:
+			result = Py_False;
+			goto out;
+		}
+	}
+	if (op == Py_EQ) {
+		/* Supporting Py_NE here as well does not save
+		   much time, since Py_NE is rarely used.  */
+		if (Py_SIZE(a) == Py_SIZE(b)
+		    && (a->ob_sval[0] == b->ob_sval[0]
+			&& memcmp(a->ob_sval, b->ob_sval, Py_SIZE(a)) == 0)) {
+			result = Py_True;
+		} else {
+			result = Py_False;
+		}
+		goto out;
+	}
+	len_a = Py_SIZE(a); len_b = Py_SIZE(b);
+	min_len = (len_a < len_b) ? len_a : len_b;
+	if (min_len > 0) {
+		c = Py_CHARMASK(*a->ob_sval) - Py_CHARMASK(*b->ob_sval);
+		if (c==0)
+			c = memcmp(a->ob_sval, b->ob_sval, min_len);
+	} else
+		c = 0;
+	if (c == 0)
+		c = (len_a < len_b) ? -1 : (len_a > len_b) ? 1 : 0;
+	switch (op) {
+	case Py_LT: c = c <  0; break;
+	case Py_LE: c = c <= 0; break;
+	case Py_EQ: assert(0);  break; /* unreachable */
+	case Py_NE: c = c != 0; break;
+	case Py_GT: c = c >  0; break;
+	case Py_GE: c = c >= 0; break;
+	default:
+		result = Py_NotImplemented;
+		goto out;
+	}
+	result = c ? Py_True : Py_False;
+  out:
+	Py_INCREF(result);
+	return result;
+}
+
+static long
+string_hash(PyBytesObject *a)
+{
+	register Py_ssize_t len;
+	register unsigned char *p;
+	register long x;
+
+	if (a->ob_shash != -1)
+		return a->ob_shash;
+	len = Py_SIZE(a);
+	p = (unsigned char *) a->ob_sval;
+	x = *p << 7;
+	while (--len >= 0)
+		x = (1000003*x) ^ *p++;
+	x ^= Py_SIZE(a);
+	if (x == -1)
+		x = -2;
+	a->ob_shash = x;
+	return x;
+}
+
+static PyObject*
+string_subscript(PyBytesObject* self, PyObject* item)
+{
+	if (PyIndex_Check(item)) {
+		Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
+		if (i == -1 && PyErr_Occurred())
+			return NULL;
+		if (i < 0)
+			i += PyBytes_GET_SIZE(self);
+		if (i < 0 || i >= PyBytes_GET_SIZE(self)) {
+			PyErr_SetString(PyExc_IndexError,
+					"string index out of range");
+			return NULL;
+		}
+		return PyLong_FromLong((unsigned char)self->ob_sval[i]);
+	}
+	else if (PySlice_Check(item)) {
+		Py_ssize_t start, stop, step, slicelength, cur, i;
+		char* source_buf;
+		char* result_buf;
+		PyObject* result;
+
+		if (PySlice_GetIndicesEx((PySliceObject*)item,
+				 PyBytes_GET_SIZE(self),
+				 &start, &stop, &step, &slicelength) < 0) {
+			return NULL;
+		}
+
+		if (slicelength <= 0) {
+			return PyBytes_FromStringAndSize("", 0);
+		}
+		else if (start == 0 && step == 1 &&
+			 slicelength == PyBytes_GET_SIZE(self) &&
+			 PyBytes_CheckExact(self)) {
+			Py_INCREF(self);
+			return (PyObject *)self;
+		}
+		else if (step == 1) {
+			return PyBytes_FromStringAndSize(
+				PyBytes_AS_STRING(self) + start,
+				slicelength);
+		}
+		else {
+			source_buf = PyBytes_AsString((PyObject*)self);
+			result_buf = (char *)PyMem_Malloc(slicelength);
+			if (result_buf == NULL)
+				return PyErr_NoMemory();
+
+			for (cur = start, i = 0; i < slicelength;
+			     cur += step, i++) {
+				result_buf[i] = source_buf[cur];
+			}
+
+			result = PyBytes_FromStringAndSize(result_buf,
+							    slicelength);
+			PyMem_Free(result_buf);
+			return result;
+		}
+	}
+	else {
+		PyErr_Format(PyExc_TypeError,
+			     "string indices must be integers, not %.200s",
+			     Py_TYPE(item)->tp_name);
+		return NULL;
+	}
 }
 
-static PyObject *
-bytes_subscript(PyByteArrayObject *self, PyObject *item)
+static int
+string_buffer_getbuffer(PyBytesObject *self, Py_buffer *view, int flags)
 {
-    if (PyIndex_Check(item)) {
-        Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
+	return PyBuffer_FillInfo(view, (void *)self->ob_sval, Py_SIZE(self),
+				 0, flags);
+}
 
-        if (i == -1 && PyErr_Occurred())
-            return NULL;
+static PySequenceMethods string_as_sequence = {
+	(lenfunc)string_length, /*sq_length*/
+	(binaryfunc)string_concat, /*sq_concat*/
+	(ssizeargfunc)string_repeat, /*sq_repeat*/
+	(ssizeargfunc)string_item, /*sq_item*/
+	0,		/*sq_slice*/
+	0,		/*sq_ass_item*/
+	0,		/*sq_ass_slice*/
+	(objobjproc)string_contains /*sq_contains*/
+};
 
-        if (i < 0)
-            i += PyByteArray_GET_SIZE(self);
+static PyMappingMethods string_as_mapping = {
+	(lenfunc)string_length,
+	(binaryfunc)string_subscript,
+	0,
+};
 
-        if (i < 0 || i >= Py_SIZE(self)) {
-            PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
-            return NULL;
-        }
-        return PyLong_FromLong((unsigned char)(self->ob_bytes[i]));
-    }
-    else if (PySlice_Check(item)) {
-        Py_ssize_t start, stop, step, slicelength, cur, i;
-        if (PySlice_GetIndicesEx((PySliceObject *)item,
-                                 PyByteArray_GET_SIZE(self),
-                                 &start, &stop, &step, &slicelength) < 0) {
-            return NULL;
-        }
-
-        if (slicelength <= 0)
-            return PyByteArray_FromStringAndSize("", 0);
-        else if (step == 1) {
-            return PyByteArray_FromStringAndSize(self->ob_bytes + start,
-                                             slicelength);
-        }
-        else {
-            char *source_buf = PyByteArray_AS_STRING(self);
-            char *result_buf = (char *)PyMem_Malloc(slicelength);
-            PyObject *result;
-
-            if (result_buf == NULL)
-                return PyErr_NoMemory();
-
-            for (cur = start, i = 0; i < slicelength;
-                 cur += step, i++) {
-                     result_buf[i] = source_buf[cur];
-            }
-            result = PyByteArray_FromStringAndSize(result_buf, slicelength);
-            PyMem_Free(result_buf);
-            return result;
-        }
-    }
-    else {
-        PyErr_SetString(PyExc_TypeError, "bytearray indices must be integers");
-        return NULL;
-    }
-}
+static PyBufferProcs string_as_buffer = {
+	(getbufferproc)string_buffer_getbuffer,
+	NULL,
+};
 
-static int
-bytes_setslice(PyByteArrayObject *self, Py_ssize_t lo, Py_ssize_t hi,
-               PyObject *values)
-{
-    Py_ssize_t avail, needed;
-    void *bytes;
-    Py_buffer vbytes;
-    int res = 0;
-
-    vbytes.len = -1;
-    if (values == (PyObject *)self) {
-        /* Make a copy and call this function recursively */
-        int err;
-        values = PyByteArray_FromObject(values);
-        if (values == NULL)
-            return -1;
-        err = bytes_setslice(self, lo, hi, values);
-        Py_DECREF(values);
-        return err;
-    }
-    if (values == NULL) {
-        /* del b[lo:hi] */
-        bytes = NULL;
-        needed = 0;
-    }
-    else {
-            if (_getbuffer(values, &vbytes) < 0) {
-                    PyErr_Format(PyExc_TypeError,
-                                 "can't set bytes slice from %.100s",
-                                 Py_TYPE(values)->tp_name);
-                    return -1;
-            }
-            needed = vbytes.len;
-            bytes = vbytes.buf;
-    }
 
-    if (lo < 0)
-        lo = 0;
-    if (hi < lo)
-        hi = lo;
-    if (hi > Py_SIZE(self))
-        hi = Py_SIZE(self);
-
-    avail = hi - lo;
-    if (avail < 0)
-        lo = hi = avail = 0;
-
-    if (avail != needed) {
-        if (avail > needed) {
-            /*
-              0   lo               hi               old_size
-              |   |<----avail----->|<-----tomove------>|
-              |   |<-needed->|<-----tomove------>|
-              0   lo      new_hi              new_size
-            */
-            memmove(self->ob_bytes + lo + needed, self->ob_bytes + hi,
-                    Py_SIZE(self) - hi);
-        }
-        /* XXX(nnorwitz): need to verify this can't overflow! */
-        if (PyByteArray_Resize((PyObject *)self,
-                           Py_SIZE(self) + needed - avail) < 0) {
-                res = -1;
-                goto finish;
-        }
-        if (avail < needed) {
-            /*
-              0   lo        hi               old_size
-              |   |<-avail->|<-----tomove------>|
-              |   |<----needed---->|<-----tomove------>|
-              0   lo            new_hi              new_size
-             */
-            memmove(self->ob_bytes + lo + needed, self->ob_bytes + hi,
-                    Py_SIZE(self) - lo - needed);
-        }
-    }
+#define LEFTSTRIP 0
+#define RIGHTSTRIP 1
+#define BOTHSTRIP 2
 
-    if (needed > 0)
-        memcpy(self->ob_bytes + lo, bytes, needed);
+/* Arrays indexed by above */
+static const char *stripformat[] = {"|O:lstrip", "|O:rstrip", "|O:strip"};
 
+#define STRIPNAME(i) (stripformat[i]+3)
 
- finish:
-    if (vbytes.len != -1)
-            PyObject_ReleaseBuffer(values, &vbytes);
-    return res;
-}
 
-static int
-bytes_setitem(PyByteArrayObject *self, Py_ssize_t i, PyObject *value)
-{
-    Py_ssize_t ival;
+/* Don't call if length < 2 */
+#define Py_STRING_MATCH(target, offset, pattern, length)	\
+  (target[offset] == pattern[0] &&				\
+   target[offset+length-1] == pattern[length-1] &&		\
+   !memcmp(target+offset+1, pattern+1, length-2) )
 
-    if (i < 0)
-        i += Py_SIZE(self);
 
-    if (i < 0 || i >= Py_SIZE(self)) {
-        PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
-        return -1;
-    }
+/* Overallocate the initial list to reduce the number of reallocs for small
+   split sizes.  Eg, "A A A A A A A A A A".split() (10 elements) has three
+   resizes, to sizes 4, 8, then 16.  Most observed string splits are for human
+   text (roughly 11 words per line) and field delimited data (usually 1-10
+   fields).  For large strings the split algorithms are bandwidth limited
+   so increasing the preallocation likely will not improve things.*/
 
-    if (value == NULL)
-        return bytes_setslice(self, i, i+1, NULL);
+#define MAX_PREALLOC 12
 
-    ival = PyNumber_AsSsize_t(value, PyExc_ValueError);
-    if (ival == -1 && PyErr_Occurred())
-        return -1;
+/* 5 splits gives 6 elements */
+#define PREALLOC_SIZE(maxsplit) \
+	(maxsplit >= MAX_PREALLOC ? MAX_PREALLOC : maxsplit+1)
+
+#define SPLIT_ADD(data, left, right) {				\
+	str = PyBytes_FromStringAndSize((data) + (left),	\
+					 (right) - (left));	\
+	if (str == NULL)					\
+		goto onError;					\
+	if (count < MAX_PREALLOC) {				\
+		PyList_SET_ITEM(list, count, str);		\
+	} else {						\
+		if (PyList_Append(list, str)) {			\
+			Py_DECREF(str);				\
+			goto onError;				\
+		}						\
+		else						\
+			Py_DECREF(str);				\
+	}							\
+	count++; }
 
-    if (ival < 0 || ival >= 256) {
-        PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
-        return -1;
-    }
+/* Always force the list to the expected size. */
+#define FIX_PREALLOC_SIZE(list) Py_SIZE(list) = count
 
-    self->ob_bytes[i] = ival;
-    return 0;
-}
+#define SKIP_SPACE(s, i, len)    { while (i<len &&  ISSPACE(s[i])) i++; }
+#define SKIP_NONSPACE(s, i, len) { while (i<len && !ISSPACE(s[i])) i++; }
+#define RSKIP_SPACE(s, i)        { while (i>=0  &&  ISSPACE(s[i])) i--; }
+#define RSKIP_NONSPACE(s, i)     { while (i>=0  && !ISSPACE(s[i])) i--; }
 
-static int
-bytes_ass_subscript(PyByteArrayObject *self, PyObject *item, PyObject *values)
-{
-    Py_ssize_t start, stop, step, slicelen, needed;
-    char *bytes;
+Py_LOCAL_INLINE(PyObject *)
+split_whitespace(PyBytesObject *self, Py_ssize_t len, Py_ssize_t maxsplit)
+{
+	const char *s = PyBytes_AS_STRING(self);
+	Py_ssize_t i, j, count=0;
+	PyObject *str;
+	PyObject *list = PyList_New(PREALLOC_SIZE(maxsplit));
+
+	if (list == NULL)
+		return NULL;
+
+	i = j = 0;
+
+	while (maxsplit-- > 0) {
+		SKIP_SPACE(s, i, len);
+		if (i==len) break;
+		j = i; i++;
+		SKIP_NONSPACE(s, i, len);
+		if (j == 0 && i == len && PyBytes_CheckExact(self)) {
+			/* No whitespace in self, so just use it as list[0] */
+			Py_INCREF(self);
+			PyList_SET_ITEM(list, 0, (PyObject *)self);
+			count++;
+			break;
+		}
+		SPLIT_ADD(s, j, i);
+	}
 
-    if (PyIndex_Check(item)) {
-        Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
+	if (i < len) {
+		/* Only occurs when maxsplit was reached */
+		/* Skip any remaining whitespace and copy to end of string */
+		SKIP_SPACE(s, i, len);
+		if (i != len)
+			SPLIT_ADD(s, i, len);
+	}
+	FIX_PREALLOC_SIZE(list);
+	return list;
+  onError:
+	Py_DECREF(list);
+	return NULL;
+}
 
-        if (i == -1 && PyErr_Occurred())
-            return -1;
+Py_LOCAL_INLINE(PyObject *)
+split_char(PyBytesObject *self, Py_ssize_t len, char ch, Py_ssize_t maxcount)
+{
+	const char *s = PyBytes_AS_STRING(self);
+	register Py_ssize_t i, j, count=0;
+	PyObject *str;
+	PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
+
+	if (list == NULL)
+		return NULL;
+
+	i = j = 0;
+	while ((j < len) && (maxcount-- > 0)) {
+		for(; j<len; j++) {
+			/* I found that using memchr makes no difference */
+			if (s[j] == ch) {
+				SPLIT_ADD(s, i, j);
+				i = j = j + 1;
+				break;
+			}
+		}
+	}
+	if (i == 0 && count == 0 && PyBytes_CheckExact(self)) {
+		/* ch not in self, so just use self as list[0] */
+		Py_INCREF(self);
+		PyList_SET_ITEM(list, 0, (PyObject *)self);
+		count++;
+	}
+	else if (i <= len) {
+		SPLIT_ADD(s, i, len);
+	}
+	FIX_PREALLOC_SIZE(list);
+	return list;
 
-        if (i < 0)
-            i += PyByteArray_GET_SIZE(self);
+  onError:
+	Py_DECREF(list);
+	return NULL;
+}
 
-        if (i < 0 || i >= Py_SIZE(self)) {
-            PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
-            return -1;
-        }
-
-        if (values == NULL) {
-            /* Fall through to slice assignment */
-            start = i;
-            stop = i + 1;
-            step = 1;
-            slicelen = 1;
-        }
-        else {
-            Py_ssize_t ival = PyNumber_AsSsize_t(values, PyExc_ValueError);
-            if (ival == -1 && PyErr_Occurred())
-                return -1;
-            if (ival < 0 || ival >= 256) {
-                PyErr_SetString(PyExc_ValueError,
-                                "byte must be in range(0, 256)");
-                return -1;
-            }
-            self->ob_bytes[i] = (char)ival;
-            return 0;
-        }
-    }
-    else if (PySlice_Check(item)) {
-        if (PySlice_GetIndicesEx((PySliceObject *)item,
-                                 PyByteArray_GET_SIZE(self),
-                                 &start, &stop, &step, &slicelen) < 0) {
-            return -1;
-        }
-    }
-    else {
-        PyErr_SetString(PyExc_TypeError, "bytearray indices must be integer");
-        return -1;
-    }
+PyDoc_STRVAR(split__doc__,
+"B.split([sep[, maxsplit]]) -> list of bytes\n\
+\n\
+Return a list of the sections in B, using sep as the delimiter.\n\
+If sep is not specified or is None, B is split on ASCII whitespace\n\
+characters (space, tab, return, newline, formfeed, vertical tab).\n\
+If maxsplit is given, at most maxsplit splits are done.");
 
-    if (values == NULL) {
-        bytes = NULL;
-        needed = 0;
-    }
-    else if (values == (PyObject *)self || !PyByteArray_Check(values)) {
-        /* Make a copy an call this function recursively */
-        int err;
-        values = PyByteArray_FromObject(values);
-        if (values == NULL)
-            return -1;
-        err = bytes_ass_subscript(self, item, values);
-        Py_DECREF(values);
-        return err;
-    }
-    else {
-        assert(PyByteArray_Check(values));
-        bytes = ((PyByteArrayObject *)values)->ob_bytes;
-        needed = Py_SIZE(values);
-    }
-    /* Make sure b[5:2] = ... inserts before 5, not before 2. */
-    if ((step < 0 && start < stop) ||
-        (step > 0 && start > stop))
-        stop = start;
-    if (step == 1) {
-        if (slicelen != needed) {
-            if (slicelen > needed) {
-                /*
-                  0   start           stop              old_size
-                  |   |<---slicelen--->|<-----tomove------>|
-                  |   |<-needed->|<-----tomove------>|
-                  0   lo      new_hi              new_size
-                */
-                memmove(self->ob_bytes + start + needed, self->ob_bytes + stop,
-                        Py_SIZE(self) - stop);
-            }
-            if (PyByteArray_Resize((PyObject *)self,
-                               Py_SIZE(self) + needed - slicelen) < 0)
-                return -1;
-            if (slicelen < needed) {
-                /*
-                  0   lo        hi               old_size
-                  |   |<-avail->|<-----tomove------>|
-                  |   |<----needed---->|<-----tomove------>|
-                  0   lo            new_hi              new_size
-                 */
-                memmove(self->ob_bytes + start + needed, self->ob_bytes + stop,
-                        Py_SIZE(self) - start - needed);
-            }
-        }
-
-        if (needed > 0)
-            memcpy(self->ob_bytes + start, bytes, needed);
-
-        return 0;
-    }
-    else {
-        if (needed == 0) {
-            /* Delete slice */
-            Py_ssize_t cur, i;
-
-            if (step < 0) {
-                stop = start + 1;
-                start = stop + step * (slicelen - 1) - 1;
-                step = -step;
-            }
-            for (cur = start, i = 0;
-                 i < slicelen; cur += step, i++) {
-                Py_ssize_t lim = step - 1;
-
-                if (cur + step >= PyByteArray_GET_SIZE(self))
-                    lim = PyByteArray_GET_SIZE(self) - cur - 1;
-
-                memmove(self->ob_bytes + cur - i,
-                        self->ob_bytes + cur + 1, lim);
-            }
-            /* Move the tail of the bytes, in one chunk */
-            cur = start + slicelen*step;
-            if (cur < PyByteArray_GET_SIZE(self)) {
-                memmove(self->ob_bytes + cur - slicelen,
-                        self->ob_bytes + cur,
-                        PyByteArray_GET_SIZE(self) - cur);
-            }
-            if (PyByteArray_Resize((PyObject *)self,
-                               PyByteArray_GET_SIZE(self) - slicelen) < 0)
-                return -1;
-
-            return 0;
-        }
-        else {
-            /* Assign slice */
-            Py_ssize_t cur, i;
-
-            if (needed != slicelen) {
-                PyErr_Format(PyExc_ValueError,
-                             "attempt to assign bytes of size %zd "
-                             "to extended slice of size %zd",
-                             needed, slicelen);
-                return -1;
-            }
-            for (cur = start, i = 0; i < slicelen; cur += step, i++)
-                self->ob_bytes[cur] = bytes[i];
-            return 0;
-        }
-    }
-}
+static PyObject *
+string_split(PyBytesObject *self, PyObject *args)
+{
+	Py_ssize_t len = PyBytes_GET_SIZE(self), n, i, j;
+	Py_ssize_t maxsplit = -1, count=0;
+	const char *s = PyBytes_AS_STRING(self), *sub;
+	Py_buffer vsub;
+	PyObject *list, *str, *subobj = Py_None;
+#ifdef USE_FAST
+	Py_ssize_t pos;
+#endif
 
-static int
-bytes_init(PyByteArrayObject *self, PyObject *args, PyObject *kwds)
-{
-    static char *kwlist[] = {"source", "encoding", "errors", 0};
-    PyObject *arg = NULL;
-    const char *encoding = NULL;
-    const char *errors = NULL;
-    Py_ssize_t count;
-    PyObject *it;
-    PyObject *(*iternext)(PyObject *);
-
-    if (Py_SIZE(self) != 0) {
-        /* Empty previous contents (yes, do this first of all!) */
-        if (PyByteArray_Resize((PyObject *)self, 0) < 0)
-            return -1;
-    }
+	if (!PyArg_ParseTuple(args, "|On:split", &subobj, &maxsplit))
+		return NULL;
+	if (maxsplit < 0)
+		maxsplit = PY_SSIZE_T_MAX;
+	if (subobj == Py_None)
+		return split_whitespace(self, len, maxsplit);
+	if (_getbuffer(subobj, &vsub) < 0)
+		return NULL;
+	sub = vsub.buf;
+	n = vsub.len;
+
+	if (n == 0) {
+		PyErr_SetString(PyExc_ValueError, "empty separator");
+		PyObject_ReleaseBuffer(subobj, &vsub);
+		return NULL;
+	}
+	else if (n == 1)
+		return split_char(self, len, sub[0], maxsplit);
 
-    /* Parse arguments */
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|Oss:bytes", kwlist,
-                                     &arg, &encoding, &errors))
-        return -1;
+	list = PyList_New(PREALLOC_SIZE(maxsplit));
+	if (list == NULL) {
+		PyObject_ReleaseBuffer(subobj, &vsub);
+		return NULL;
+	}
 
-    /* Make a quick exit if no first argument */
-    if (arg == NULL) {
-        if (encoding != NULL || errors != NULL) {
-            PyErr_SetString(PyExc_TypeError,
-                            "encoding or errors without sequence argument");
-            return -1;
-        }
-        return 0;
-    }
+#ifdef USE_FAST
+	i = j = 0;
+	while (maxsplit-- > 0) {
+		pos = fastsearch(s+i, len-i, sub, n, FAST_SEARCH);
+		if (pos < 0)
+			break;
+		j = i+pos;
+		SPLIT_ADD(s, i, j);
+		i = j + n;
+	}
+#else
+	i = j = 0;
+	while ((j+n <= len) && (maxsplit-- > 0)) {
+		for (; j+n <= len; j++) {
+			if (Py_STRING_MATCH(s, j, sub, n)) {
+				SPLIT_ADD(s, i, j);
+				i = j = j + n;
+				break;
+			}
+		}
+	}
+#endif
+	SPLIT_ADD(s, i, len);
+	FIX_PREALLOC_SIZE(list);
+	PyObject_ReleaseBuffer(subobj, &vsub);
+	return list;
 
-    if (PyUnicode_Check(arg)) {
-        /* Encode via the codec registry */
-        PyObject *encoded, *new;
-        if (encoding == NULL) {
-            PyErr_SetString(PyExc_TypeError,
-                            "string argument without an encoding");
-            return -1;
-        }
-        encoded = PyCodec_Encode(arg, encoding, errors);
-        if (encoded == NULL)
-            return -1;
-        assert(PyBytes_Check(encoded));
-        new = bytes_iconcat(self, encoded);
-        Py_DECREF(encoded);
-        if (new == NULL)
-            return -1;
-        Py_DECREF(new);
-        return 0;
-    }
+ onError:
+	Py_DECREF(list);
+	PyObject_ReleaseBuffer(subobj, &vsub);
+	return NULL;
+}
 
-    /* If it's not unicode, there can't be encoding or errors */
-    if (encoding != NULL || errors != NULL) {
-        PyErr_SetString(PyExc_TypeError,
-                        "encoding or errors without a string argument");
-        return -1;
-    }
+PyDoc_STRVAR(partition__doc__,
+"B.partition(sep) -> (head, sep, tail)\n\
+\n\
+Searches for the separator sep in B, and returns the part before it,\n\
+the separator itself, and the part after it.  If the separator is not\n\
+found, returns B and two empty bytes objects.");
 
-    /* Is it an int? */
-    count = PyNumber_AsSsize_t(arg, PyExc_ValueError);
-    if (count == -1 && PyErr_Occurred())
-        PyErr_Clear();
-    else {
-        if (count < 0) {
-            PyErr_SetString(PyExc_ValueError, "negative count");
-            return -1;
-        }
-        if (count > 0) {
-            if (PyByteArray_Resize((PyObject *)self, count))
-                return -1;
-            memset(self->ob_bytes, 0, count);
-        }
-        return 0;
-    }
+static PyObject *
+string_partition(PyBytesObject *self, PyObject *sep_obj)
+{
+	const char *sep;
+	Py_ssize_t sep_len;
 
-    /* Use the buffer API */
-    if (PyObject_CheckBuffer(arg)) {
-        Py_ssize_t size;
-        Py_buffer view;
-        if (PyObject_GetBuffer(arg, &view, PyBUF_FULL_RO) < 0)
-            return -1;
-        size = view.len;
-        if (PyByteArray_Resize((PyObject *)self, size) < 0) goto fail;
-        if (PyBuffer_ToContiguous(self->ob_bytes, &view, size, 'C') < 0)
-                goto fail;
-        PyObject_ReleaseBuffer(arg, &view);
-        return 0;
-    fail:
-        PyObject_ReleaseBuffer(arg, &view);
-        return -1;
-    }
+	if (PyBytes_Check(sep_obj)) {
+		sep = PyBytes_AS_STRING(sep_obj);
+		sep_len = PyBytes_GET_SIZE(sep_obj);
+	}
+	else if (PyObject_AsCharBuffer(sep_obj, &sep, &sep_len))
+		return NULL;
 
-    /* XXX Optimize this if the arguments is a list, tuple */
+	return stringlib_partition(
+		(PyObject*) self,
+		PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self),
+		sep_obj, sep, sep_len
+		);
+}
 
-    /* Get the iterator */
-    it = PyObject_GetIter(arg);
-    if (it == NULL)
-        return -1;
-    iternext = *Py_TYPE(it)->tp_iternext;
-
-    /* Run the iterator to exhaustion */
-    for (;;) {
-        PyObject *item;
-        Py_ssize_t value;
-
-        /* Get the next item */
-        item = iternext(it);
-        if (item == NULL) {
-            if (PyErr_Occurred()) {
-                if (!PyErr_ExceptionMatches(PyExc_StopIteration))
-                    goto error;
-                PyErr_Clear();
-            }
-            break;
-        }
-
-        /* Interpret it as an int (__index__) */
-        value = PyNumber_AsSsize_t(item, PyExc_ValueError);
-        Py_DECREF(item);
-        if (value == -1 && PyErr_Occurred())
-            goto error;
-
-        /* Range check */
-        if (value < 0 || value >= 256) {
-            PyErr_SetString(PyExc_ValueError,
-                            "bytes must be in range(0, 256)");
-            goto error;
-        }
-
-        /* Append the byte */
-        if (Py_SIZE(self) < self->ob_alloc)
-            Py_SIZE(self)++;
-        else if (PyByteArray_Resize((PyObject *)self, Py_SIZE(self)+1) < 0)
-            goto error;
-        self->ob_bytes[Py_SIZE(self)-1] = value;
-    }
+PyDoc_STRVAR(rpartition__doc__,
+"B.rpartition(sep) -> (tail, sep, head)\n\
+\n\
+Searches for the separator sep in B, starting at the end of B,\n\
+and returns the part before it, the separator itself, and the\n\
+part after it.  If the separator is not found, returns two empty\n\
+bytes objects and B.");
 
-    /* Clean up and return success */
-    Py_DECREF(it);
-    return 0;
+static PyObject *
+string_rpartition(PyBytesObject *self, PyObject *sep_obj)
+{
+	const char *sep;
+	Py_ssize_t sep_len;
 
- error:
-    /* Error handling when it != NULL */
-    Py_DECREF(it);
-    return -1;
+	if (PyBytes_Check(sep_obj)) {
+		sep = PyBytes_AS_STRING(sep_obj);
+		sep_len = PyBytes_GET_SIZE(sep_obj);
+	}
+	else if (PyObject_AsCharBuffer(sep_obj, &sep, &sep_len))
+		return NULL;
+
+	return stringlib_rpartition(
+		(PyObject*) self,
+		PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self),
+		sep_obj, sep, sep_len
+		);
 }
 
-/* Mostly copied from string_repr, but without the
-   "smart quote" functionality. */
-static PyObject *
-bytes_repr(PyByteArrayObject *self)
-{
-    static const char *hexdigits = "0123456789abcdef";
-    const char *quote_prefix = "bytearray(b";
-    const char *quote_postfix = ")";
-    Py_ssize_t length = Py_SIZE(self);
-    /* 14 == strlen(quote_prefix) + 2 + strlen(quote_postfix) */
-    size_t newsize = 14 + 4 * length;
-    PyObject *v;
-    if (newsize > PY_SSIZE_T_MAX || newsize / 4 - 3 != length) {
-        PyErr_SetString(PyExc_OverflowError,
-            "bytearray object is too large to make repr");
-        return NULL;
-    }
-    v = PyUnicode_FromUnicode(NULL, newsize);
-    if (v == NULL) {
-        return NULL;
-    }
-    else {
-        register Py_ssize_t i;
-        register Py_UNICODE c;
-        register Py_UNICODE *p;
-        int quote;
-
-        /* Figure out which quote to use; single is preferred */
-        quote = '\'';
-        {
-            char *test, *start;
-            start = PyByteArray_AS_STRING(self);
-            for (test = start; test < start+length; ++test) {
-                if (*test == '"') {
-                    quote = '\''; /* back to single */
-                    goto decided;
-                }
-                else if (*test == '\'')
-                    quote = '"';
-            }
-          decided:
-            ;
-        }
-
-        p = PyUnicode_AS_UNICODE(v);
-        while (*quote_prefix)
-            *p++ = *quote_prefix++;
-        *p++ = quote;
-
-        for (i = 0; i < length; i++) {
-            /* There's at least enough room for a hex escape
-               and a closing quote. */
-            assert(newsize - (p - PyUnicode_AS_UNICODE(v)) >= 5);
-            c = self->ob_bytes[i];
-            if (c == '\'' || c == '\\')
-                *p++ = '\\', *p++ = c;
-            else if (c == '\t')
-                *p++ = '\\', *p++ = 't';
-            else if (c == '\n')
-                *p++ = '\\', *p++ = 'n';
-            else if (c == '\r')
-                *p++ = '\\', *p++ = 'r';
-            else if (c == 0)
-                *p++ = '\\', *p++ = 'x', *p++ = '0', *p++ = '0';
-            else if (c < ' ' || c >= 0x7f) {
-                *p++ = '\\';
-                *p++ = 'x';
-                *p++ = hexdigits[(c & 0xf0) >> 4];
-                *p++ = hexdigits[c & 0xf];
-            }
-            else
-                *p++ = c;
-        }
-        assert(newsize - (p - PyUnicode_AS_UNICODE(v)) >= 1);
-        *p++ = quote;
-        while (*quote_postfix) {
-           *p++ = *quote_postfix++;
-        }
-        *p = '\0';
-        if (PyUnicode_Resize(&v, (p - PyUnicode_AS_UNICODE(v)))) {
-            Py_DECREF(v);
-            return NULL;
-        }
-        return v;
-    }
+Py_LOCAL_INLINE(PyObject *)
+rsplit_whitespace(PyBytesObject *self, Py_ssize_t len, Py_ssize_t maxsplit)
+{
+	const char *s = PyBytes_AS_STRING(self);
+	Py_ssize_t i, j, count=0;
+	PyObject *str;
+	PyObject *list = PyList_New(PREALLOC_SIZE(maxsplit));
+
+	if (list == NULL)
+		return NULL;
+
+	i = j = len-1;
+
+	while (maxsplit-- > 0) {
+		RSKIP_SPACE(s, i);
+		if (i<0) break;
+		j = i; i--;
+		RSKIP_NONSPACE(s, i);
+		if (j == len-1 && i < 0 && PyBytes_CheckExact(self)) {
+			/* No whitespace in self, so just use it as list[0] */
+			Py_INCREF(self);
+			PyList_SET_ITEM(list, 0, (PyObject *)self);
+			count++;
+			break;
+		}
+		SPLIT_ADD(s, i + 1, j + 1);
+	}
+	if (i >= 0) {
+		/* Only occurs when maxsplit was reached.  Skip any remaining
+		   whitespace and copy to beginning of string. */
+		RSKIP_SPACE(s, i);
+		if (i >= 0)
+			SPLIT_ADD(s, 0, i + 1);
+
+	}
+	FIX_PREALLOC_SIZE(list);
+	if (PyList_Reverse(list) < 0)
+		goto onError;
+	return list;
+  onError:
+	Py_DECREF(list);
+	return NULL;
 }
 
-static PyObject *
-bytes_str(PyObject *op)
-{
-	if (Py_BytesWarningFlag) {
-		if (PyErr_WarnEx(PyExc_BytesWarning,
-				 "str() on a bytearray instance", 1))
-			return NULL;
+Py_LOCAL_INLINE(PyObject *)
+rsplit_char(PyBytesObject *self, Py_ssize_t len, char ch, Py_ssize_t maxcount)
+{
+	const char *s = PyBytes_AS_STRING(self);
+	register Py_ssize_t i, j, count=0;
+	PyObject *str;
+	PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
+
+	if (list == NULL)
+		return NULL;
+
+	i = j = len - 1;
+	while ((i >= 0) && (maxcount-- > 0)) {
+		for (; i >= 0; i--) {
+			if (s[i] == ch) {
+				SPLIT_ADD(s, i + 1, j + 1);
+				j = i = i - 1;
+				break;
+			}
+		}
+	}
+	if (i < 0 && count == 0 && PyBytes_CheckExact(self)) {
+		/* ch not in self, so just use self as list[0] */
+		Py_INCREF(self);
+		PyList_SET_ITEM(list, 0, (PyObject *)self);
+		count++;
 	}
-	return bytes_repr((PyByteArrayObject*)op);
+	else if (j >= -1) {
+		SPLIT_ADD(s, 0, j + 1);
+	}
+	FIX_PREALLOC_SIZE(list);
+	if (PyList_Reverse(list) < 0)
+		goto onError;
+	return list;
+
+ onError:
+	Py_DECREF(list);
+	return NULL;
 }
 
-static PyObject *
-bytes_richcompare(PyObject *self, PyObject *other, int op)
-{
-    Py_ssize_t self_size, other_size;
-    Py_buffer self_bytes, other_bytes;
-    PyObject *res;
-    Py_ssize_t minsize;
-    int cmp;
-
-    /* Bytes can be compared to anything that supports the (binary)
-       buffer API.  Except that a comparison with Unicode is always an
-       error, even if the comparison is for equality. */
-    if (PyObject_IsInstance(self, (PyObject*)&PyUnicode_Type) ||
-        PyObject_IsInstance(other, (PyObject*)&PyUnicode_Type)) {
-        if (Py_BytesWarningFlag && op == Py_EQ) {
-            if (PyErr_WarnEx(PyExc_BytesWarning,
-                            "Comparsion between bytearray and string", 1))
-                return NULL;
-        }
+PyDoc_STRVAR(rsplit__doc__,
+"B.rsplit([sep[, maxsplit]]) -> list of strings\n\
+\n\
+Return a list of the sections in B, using sep as the delimiter,\n\
+starting at the end of B and working to the front.\n\
+If sep is not given, B is split on ASCII whitespace characters\n\
+(space, tab, return, newline, formfeed, vertical tab).\n\
+If maxsplit is given, at most maxsplit splits are done.");
 
-        Py_INCREF(Py_NotImplemented);
-        return Py_NotImplemented;
-    }
 
-    self_size = _getbuffer(self, &self_bytes);
-    if (self_size < 0) {
-        PyErr_Clear();
-        Py_INCREF(Py_NotImplemented);
-        return Py_NotImplemented;
-    }
+static PyObject *
+string_rsplit(PyBytesObject *self, PyObject *args)
+{
+	Py_ssize_t len = PyBytes_GET_SIZE(self), n, i, j;
+	Py_ssize_t maxsplit = -1, count=0;
+	const char *s, *sub;
+	Py_buffer vsub;
+	PyObject *list, *str, *subobj = Py_None;
+
+	if (!PyArg_ParseTuple(args, "|On:rsplit", &subobj, &maxsplit))
+		return NULL;
+	if (maxsplit < 0)
+		maxsplit = PY_SSIZE_T_MAX;
+	if (subobj == Py_None)
+		return rsplit_whitespace(self, len, maxsplit);
+	if (_getbuffer(subobj, &vsub) < 0)
+		return NULL;
+	sub = vsub.buf;
+	n = vsub.len;
+
+	if (n == 0) {
+		PyErr_SetString(PyExc_ValueError, "empty separator");
+		PyObject_ReleaseBuffer(subobj, &vsub);
+		return NULL;
+	}
+	else if (n == 1)
+		return rsplit_char(self, len, sub[0], maxsplit);
 
-    other_size = _getbuffer(other, &other_bytes);
-    if (other_size < 0) {
-        PyErr_Clear();
-        PyObject_ReleaseBuffer(self, &self_bytes);
-        Py_INCREF(Py_NotImplemented);
-        return Py_NotImplemented;
-    }
+	list = PyList_New(PREALLOC_SIZE(maxsplit));
+	if (list == NULL) {
+		PyObject_ReleaseBuffer(subobj, &vsub);
+		return NULL;
+	}
 
-    if (self_size != other_size && (op == Py_EQ || op == Py_NE)) {
-        /* Shortcut: if the lengths differ, the objects differ */
-        cmp = (op == Py_NE);
-    }
-    else {
-        minsize = self_size;
-        if (other_size < minsize)
-            minsize = other_size;
-
-        cmp = memcmp(self_bytes.buf, other_bytes.buf, minsize);
-        /* In ISO C, memcmp() guarantees to use unsigned bytes! */
-
-        if (cmp == 0) {
-            if (self_size < other_size)
-                cmp = -1;
-            else if (self_size > other_size)
-                cmp = 1;
-        }
-
-        switch (op) {
-        case Py_LT: cmp = cmp <  0; break;
-        case Py_LE: cmp = cmp <= 0; break;
-        case Py_EQ: cmp = cmp == 0; break;
-        case Py_NE: cmp = cmp != 0; break;
-        case Py_GT: cmp = cmp >  0; break;
-        case Py_GE: cmp = cmp >= 0; break;
-        }
-    }
+	j = len;
+	i = j - n;
+
+	s = PyBytes_AS_STRING(self);
+	while ( (i >= 0) && (maxsplit-- > 0) ) {
+		for (; i>=0; i--) {
+			if (Py_STRING_MATCH(s, i, sub, n)) {
+				SPLIT_ADD(s, i + n, j);
+				j = i;
+				i -= n;
+				break;
+			}
+		}
+	}
+	SPLIT_ADD(s, 0, j);
+	FIX_PREALLOC_SIZE(list);
+	if (PyList_Reverse(list) < 0)
+		goto onError;
+	PyObject_ReleaseBuffer(subobj, &vsub);
+	return list;
 
-    res = cmp ? Py_True : Py_False;
-    PyObject_ReleaseBuffer(self, &self_bytes);
-    PyObject_ReleaseBuffer(other, &other_bytes);
-    Py_INCREF(res);
-    return res;
+onError:
+	Py_DECREF(list);
+	PyObject_ReleaseBuffer(subobj, &vsub);
+	return NULL;
 }
 
-static void
-bytes_dealloc(PyByteArrayObject *self)
-{
-    if (self->ob_bytes != 0) {
-        PyMem_Free(self->ob_bytes);
-    }
-    Py_TYPE(self)->tp_free((PyObject *)self);
-}
+#undef SPLIT_ADD
+#undef MAX_PREALLOC
+#undef PREALLOC_SIZE
 
 
-/* -------------------------------------------------------------------- */
-/* Methods */
+PyDoc_STRVAR(join__doc__,
+"B.join(iterable_of_bytes) -> bytes\n\
+\n\
+Concatenates any number of bytes objects, with B in between each pair.\n\
+Example: b'.'.join([b'ab', b'pq', b'rs']) -> b'ab.pq.rs'.");
 
-#define STRINGLIB_CHAR char
-#define STRINGLIB_CMP memcmp
-#define STRINGLIB_LEN PyByteArray_GET_SIZE
-#define STRINGLIB_STR PyByteArray_AS_STRING
-#define STRINGLIB_NEW PyByteArray_FromStringAndSize
-#define STRINGLIB_EMPTY nullbytes
-#define STRINGLIB_CHECK_EXACT PyByteArray_CheckExact
-#define STRINGLIB_MUTABLE 1
+static PyObject *
+string_join(PyObject *self, PyObject *orig)
+{
+	char *sep = PyBytes_AS_STRING(self);
+	const Py_ssize_t seplen = PyBytes_GET_SIZE(self);
+	PyObject *res = NULL;
+	char *p;
+	Py_ssize_t seqlen = 0;
+	size_t sz = 0;
+	Py_ssize_t i;
+	PyObject *seq, *item;
+
+	seq = PySequence_Fast(orig, "");
+	if (seq == NULL) {
+		return NULL;
+	}
 
-#include "stringlib/fastsearch.h"
-#include "stringlib/count.h"
-#include "stringlib/find.h"
-#include "stringlib/partition.h"
-#include "stringlib/ctype.h"
-#include "stringlib/transmogrify.h"
+	seqlen = PySequence_Size(seq);
+	if (seqlen == 0) {
+		Py_DECREF(seq);
+		return PyBytes_FromString("");
+	}
+	if (seqlen == 1) {
+		item = PySequence_Fast_GET_ITEM(seq, 0);
+		if (PyBytes_CheckExact(item)) {
+			Py_INCREF(item);
+			Py_DECREF(seq);
+			return item;
+		}
+	}
 
+	/* There are at least two things to join, or else we have a subclass
+	 * of the builtin types in the sequence.
+	 * Do a pre-pass to figure out the total amount of space we'll
+	 * need (sz), and see whether all argument are bytes.
+	 */
+	/* XXX Shouldn't we use _getbuffer() on these items instead? */
+	for (i = 0; i < seqlen; i++) {
+		const size_t old_sz = sz;
+		item = PySequence_Fast_GET_ITEM(seq, i);
+		if (!PyBytes_Check(item) && !PyByteArray_Check(item)) {
+			PyErr_Format(PyExc_TypeError,
+				     "sequence item %zd: expected bytes,"
+				     " %.80s found",
+				     i, Py_TYPE(item)->tp_name);
+			Py_DECREF(seq);
+			return NULL;
+		}
+		sz += Py_SIZE(item);
+		if (i != 0)
+			sz += seplen;
+		if (sz < old_sz || sz > PY_SSIZE_T_MAX) {
+			PyErr_SetString(PyExc_OverflowError,
+			    "join() result is too long for a Python string");
+			Py_DECREF(seq);
+			return NULL;
+		}
+	}
 
-/* The following Py_LOCAL_INLINE and Py_LOCAL functions
-were copied from the old char* style string object. */
+	/* Allocate result space. */
+	res = PyBytes_FromStringAndSize((char*)NULL, sz);
+	if (res == NULL) {
+		Py_DECREF(seq);
+		return NULL;
+	}
 
-Py_LOCAL_INLINE(void)
-_adjust_indices(Py_ssize_t *start, Py_ssize_t *end, Py_ssize_t len)
+	/* Catenate everything. */
+	/* I'm not worried about a PyByteArray item growing because there's
+	   nowhere in this function where we release the GIL. */
+	p = PyBytes_AS_STRING(res);
+	for (i = 0; i < seqlen; ++i) {
+		size_t n;
+                char *q;
+		if (i) {
+			Py_MEMCPY(p, sep, seplen);
+			p += seplen;
+		}
+		item = PySequence_Fast_GET_ITEM(seq, i);
+		n = Py_SIZE(item);
+                if (PyBytes_Check(item))
+			q = PyBytes_AS_STRING(item);
+		else
+			q = PyByteArray_AS_STRING(item);
+		Py_MEMCPY(p, q, n);
+		p += n;
+	}
+
+	Py_DECREF(seq);
+	return res;
+}
+
+PyObject *
+_PyBytes_Join(PyObject *sep, PyObject *x)
 {
-    if (*end > len)
-        *end = len;
-    else if (*end < 0)
-        *end += len;
-    if (*end < 0)
-        *end = 0;
-    if (*start < 0)
-        *start += len;
-    if (*start < 0)
-        *start = 0;
+	assert(sep != NULL && PyBytes_Check(sep));
+	assert(x != NULL);
+	return string_join(sep, x);
 }
 
+Py_LOCAL_INLINE(void)
+string_adjust_indices(Py_ssize_t *start, Py_ssize_t *end, Py_ssize_t len)
+{
+	if (*end > len)
+		*end = len;
+	else if (*end < 0)
+		*end += len;
+	if (*end < 0)
+		*end = 0;
+	if (*start < 0)
+		*start += len;
+	if (*start < 0)
+		*start = 0;
+}
 
 Py_LOCAL_INLINE(Py_ssize_t)
-bytes_find_internal(PyByteArrayObject *self, PyObject *args, int dir)
-{
-    PyObject *subobj;
-    Py_buffer subbuf;
-    Py_ssize_t start=0, end=PY_SSIZE_T_MAX;
-    Py_ssize_t res;
-
-    if (!PyArg_ParseTuple(args, "O|O&O&:find/rfind/index/rindex", &subobj,
-        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
-        return -2;
-    if (_getbuffer(subobj, &subbuf) < 0)
-        return -2;
-    if (dir > 0)
-        res = stringlib_find_slice(
-            PyByteArray_AS_STRING(self), PyByteArray_GET_SIZE(self),
-            subbuf.buf, subbuf.len, start, end);
-    else
-        res = stringlib_rfind_slice(
-            PyByteArray_AS_STRING(self), PyByteArray_GET_SIZE(self),
-            subbuf.buf, subbuf.len, start, end);
-    PyObject_ReleaseBuffer(subobj, &subbuf);
-    return res;
+string_find_internal(PyBytesObject *self, PyObject *args, int dir)
+{
+	PyObject *subobj;
+	const char *sub;
+	Py_ssize_t sub_len;
+	Py_ssize_t start=0, end=PY_SSIZE_T_MAX;
+	PyObject *obj_start=Py_None, *obj_end=Py_None;
+
+	if (!PyArg_ParseTuple(args, "O|OO:find/rfind/index/rindex", &subobj,
+		&obj_start, &obj_end))
+		return -2;
+	/* To support None in "start" and "end" arguments, meaning
+	   the same as if they were not passed.
+	*/
+	if (obj_start != Py_None)
+		if (!_PyEval_SliceIndex(obj_start, &start))
+	        return -2;
+	if (obj_end != Py_None)
+		if (!_PyEval_SliceIndex(obj_end, &end))
+	        return -2;
+
+	if (PyBytes_Check(subobj)) {
+		sub = PyBytes_AS_STRING(subobj);
+		sub_len = PyBytes_GET_SIZE(subobj);
+	}
+	else if (PyObject_AsCharBuffer(subobj, &sub, &sub_len))
+		/* XXX - the "expected a character buffer object" is pretty
+		   confusing for a non-expert.  remap to something else ? */
+		return -2;
+
+	if (dir > 0)
+		return stringlib_find_slice(
+			PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self),
+			sub, sub_len, start, end);
+	else
+		return stringlib_rfind_slice(
+			PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self),
+			sub, sub_len, start, end);
 }
 
+
 PyDoc_STRVAR(find__doc__,
 "B.find(sub [,start [,end]]) -> int\n\
 \n\
-Return the lowest index in B where subsection sub is found,\n\
-such that sub is contained within s[start,end].  Optional\n\
+Return the lowest index in S where substring sub is found,\n\
+such that sub is contained within s[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");
 
 static PyObject *
-bytes_find(PyByteArrayObject *self, PyObject *args)
+string_find(PyBytesObject *self, PyObject *args)
 {
-    Py_ssize_t result = bytes_find_internal(self, args, +1);
-    if (result == -2)
-        return NULL;
-    return PyLong_FromSsize_t(result);
-}
-
-PyDoc_STRVAR(count__doc__,
-"B.count(sub [,start [,end]]) -> int\n\
-\n\
-Return the number of non-overlapping occurrences of subsection sub in\n\
-bytes B[start:end].  Optional arguments start and end are interpreted\n\
-as in slice notation.");
-
-static PyObject *
-bytes_count(PyByteArrayObject *self, PyObject *args)
-{
-    PyObject *sub_obj;
-    const char *str = PyByteArray_AS_STRING(self);
-    Py_ssize_t start = 0, end = PY_SSIZE_T_MAX;
-    Py_buffer vsub;
-    PyObject *count_obj;
-
-    if (!PyArg_ParseTuple(args, "O|O&O&:count", &sub_obj,
-        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
-        return NULL;
-
-    if (_getbuffer(sub_obj, &vsub) < 0)
-        return NULL;
-
-    _adjust_indices(&start, &end, PyByteArray_GET_SIZE(self));
-
-    count_obj = PyLong_FromSsize_t(
-        stringlib_count(str + start, end - start, vsub.buf, vsub.len)
-        );
-    PyObject_ReleaseBuffer(sub_obj, &vsub);
-    return count_obj;
+	Py_ssize_t result = string_find_internal(self, args, +1);
+	if (result == -2)
+		return NULL;
+	return PyLong_FromSsize_t(result);
 }
 
 
 PyDoc_STRVAR(index__doc__,
 "B.index(sub [,start [,end]]) -> int\n\
 \n\
-Like B.find() but raise ValueError when the subsection is not found.");
+Like B.find() but raise ValueError when the substring is not found.");
 
 static PyObject *
-bytes_index(PyByteArrayObject *self, PyObject *args)
-{
-    Py_ssize_t result = bytes_find_internal(self, args, +1);
-    if (result == -2)
-        return NULL;
-    if (result == -1) {
-        PyErr_SetString(PyExc_ValueError,
-                        "subsection not found");
-        return NULL;
-    }
-    return PyLong_FromSsize_t(result);
+string_index(PyBytesObject *self, PyObject *args)
+{
+	Py_ssize_t result = string_find_internal(self, args, +1);
+	if (result == -2)
+		return NULL;
+	if (result == -1) {
+		PyErr_SetString(PyExc_ValueError,
+				"substring not found");
+		return NULL;
+	}
+	return PyLong_FromSsize_t(result);
 }
 
 
 PyDoc_STRVAR(rfind__doc__,
 "B.rfind(sub [,start [,end]]) -> int\n\
 \n\
-Return the highest index in B where subsection sub is found,\n\
-such that sub is contained within s[start,end].  Optional\n\
+Return the highest index in B where substring sub is found,\n\
+such that sub is contained within s[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");
 
 static PyObject *
-bytes_rfind(PyByteArrayObject *self, PyObject *args)
+string_rfind(PyBytesObject *self, PyObject *args)
 {
-    Py_ssize_t result = bytes_find_internal(self, args, -1);
-    if (result == -2)
-        return NULL;
-    return PyLong_FromSsize_t(result);
+	Py_ssize_t result = string_find_internal(self, args, -1);
+	if (result == -2)
+		return NULL;
+	return PyLong_FromSsize_t(result);
 }
 
 
 PyDoc_STRVAR(rindex__doc__,
 "B.rindex(sub [,start [,end]]) -> int\n\
 \n\
-Like B.rfind() but raise ValueError when the subsection is not found.");
+Like B.rfind() but raise ValueError when the substring is not found.");
 
 static PyObject *
-bytes_rindex(PyByteArrayObject *self, PyObject *args)
-{
-    Py_ssize_t result = bytes_find_internal(self, args, -1);
-    if (result == -2)
-        return NULL;
-    if (result == -1) {
-        PyErr_SetString(PyExc_ValueError,
-                        "subsection not found");
-        return NULL;
-    }
-    return PyLong_FromSsize_t(result);
+string_rindex(PyBytesObject *self, PyObject *args)
+{
+	Py_ssize_t result = string_find_internal(self, args, -1);
+	if (result == -2)
+		return NULL;
+	if (result == -1) {
+		PyErr_SetString(PyExc_ValueError,
+				"substring not found");
+		return NULL;
+	}
+	return PyLong_FromSsize_t(result);
 }
 
 
-static int
-bytes_contains(PyObject *self, PyObject *arg)
+Py_LOCAL_INLINE(PyObject *)
+do_xstrip(PyBytesObject *self, int striptype, PyObject *sepobj)
+{
+	Py_buffer vsep;
+	char *s = PyBytes_AS_STRING(self);
+	Py_ssize_t len = PyBytes_GET_SIZE(self);
+	char *sep;
+	Py_ssize_t seplen;
+	Py_ssize_t i, j;
+
+	if (_getbuffer(sepobj, &vsep) < 0)
+		return NULL;
+	sep = vsep.buf;
+	seplen = vsep.len;
+
+	i = 0;
+	if (striptype != RIGHTSTRIP) {
+		while (i < len && memchr(sep, Py_CHARMASK(s[i]), seplen)) {
+			i++;
+		}
+	}
+
+	j = len;
+	if (striptype != LEFTSTRIP) {
+		do {
+			j--;
+		} while (j >= i && memchr(sep, Py_CHARMASK(s[j]), seplen));
+		j++;
+	}
+
+	PyObject_ReleaseBuffer(sepobj, &vsep);
+
+	if (i == 0 && j == len && PyBytes_CheckExact(self)) {
+		Py_INCREF(self);
+		return (PyObject*)self;
+	}
+	else
+		return PyBytes_FromStringAndSize(s+i, j-i);
+}
+
+
+Py_LOCAL_INLINE(PyObject *)
+do_strip(PyBytesObject *self, int striptype)
 {
-    Py_ssize_t ival = PyNumber_AsSsize_t(arg, PyExc_ValueError);
-    if (ival == -1 && PyErr_Occurred()) {
-        Py_buffer varg;
-        int pos;
-        PyErr_Clear();
-        if (_getbuffer(arg, &varg) < 0)
-            return -1;
-        pos = stringlib_find(PyByteArray_AS_STRING(self), Py_SIZE(self),
-                             varg.buf, varg.len, 0);
-        PyObject_ReleaseBuffer(arg, &varg);
-        return pos >= 0;
-    }
-    if (ival < 0 || ival >= 256) {
-        PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
-        return -1;
-    }
+	char *s = PyBytes_AS_STRING(self);
+	Py_ssize_t len = PyBytes_GET_SIZE(self), i, j;
+
+	i = 0;
+	if (striptype != RIGHTSTRIP) {
+		while (i < len && ISSPACE(s[i])) {
+			i++;
+		}
+	}
+
+	j = len;
+	if (striptype != LEFTSTRIP) {
+		do {
+			j--;
+		} while (j >= i && ISSPACE(s[j]));
+		j++;
+	}
 
-    return memchr(PyByteArray_AS_STRING(self), ival, Py_SIZE(self)) != NULL;
+	if (i == 0 && j == len && PyBytes_CheckExact(self)) {
+		Py_INCREF(self);
+		return (PyObject*)self;
+	}
+	else
+		return PyBytes_FromStringAndSize(s+i, j-i);
 }
 
 
-/* Matches the end (direction >= 0) or start (direction < 0) of self
- * against substr, using the start and end arguments. Returns
- * -1 on error, 0 if not found and 1 if found.
- */
-Py_LOCAL(int)
-_bytes_tailmatch(PyByteArrayObject *self, PyObject *substr, Py_ssize_t start,
-                 Py_ssize_t end, int direction)
+Py_LOCAL_INLINE(PyObject *)
+do_argstrip(PyBytesObject *self, int striptype, PyObject *args)
 {
-    Py_ssize_t len = PyByteArray_GET_SIZE(self);
-    const char* str;
-    Py_buffer vsubstr;
-    int rv = 0;
+	PyObject *sep = NULL;
 
-    str = PyByteArray_AS_STRING(self);
+	if (!PyArg_ParseTuple(args, (char *)stripformat[striptype], &sep))
+		return NULL;
 
-    if (_getbuffer(substr, &vsubstr) < 0)
-        return -1;
+	if (sep != NULL && sep != Py_None) {
+		return do_xstrip(self, striptype, sep);
+	}
+	return do_strip(self, striptype);
+}
 
-    _adjust_indices(&start, &end, len);
-
-    if (direction < 0) {
-        /* startswith */
-        if (start+vsubstr.len > len) {
-            goto done;
-        }
-    } else {
-        /* endswith */
-        if (end-start < vsubstr.len || start > len) {
-            goto done;
-        }
-
-        if (end-vsubstr.len > start)
-            start = end - vsubstr.len;
-    }
-    if (end-start >= vsubstr.len)
-        rv = ! memcmp(str+start, vsubstr.buf, vsubstr.len);
 
-done:
-    PyObject_ReleaseBuffer(substr, &vsubstr);
-    return rv;
+PyDoc_STRVAR(strip__doc__,
+"B.strip([bytes]) -> bytes\n\
+\n\
+Strip leading and trailing bytes contained in the argument.\n\
+If the argument is omitted, strip trailing ASCII whitespace.");
+static PyObject *
+string_strip(PyBytesObject *self, PyObject *args)
+{
+	if (PyTuple_GET_SIZE(args) == 0)
+		return do_strip(self, BOTHSTRIP); /* Common case */
+	else
+		return do_argstrip(self, BOTHSTRIP, args);
 }
 
 
-PyDoc_STRVAR(startswith__doc__,
-"B.startswith(prefix [,start [,end]]) -> bool\n\
+PyDoc_STRVAR(lstrip__doc__,
+"B.lstrip([bytes]) -> bytes\n\
 \n\
-Return True if B starts with the specified prefix, False otherwise.\n\
-With optional start, test B beginning at that position.\n\
-With optional end, stop comparing B at that position.\n\
-prefix can also be a tuple of strings to try.");
+Strip leading bytes contained in the argument.\n\
+If the argument is omitted, strip leading ASCII whitespace.");
+static PyObject *
+string_lstrip(PyBytesObject *self, PyObject *args)
+{
+	if (PyTuple_GET_SIZE(args) == 0)
+		return do_strip(self, LEFTSTRIP); /* Common case */
+	else
+		return do_argstrip(self, LEFTSTRIP, args);
+}
+
 
+PyDoc_STRVAR(rstrip__doc__,
+"B.rstrip([bytes]) -> bytes\n\
+\n\
+Strip trailing bytes contained in the argument.\n\
+If the argument is omitted, strip trailing ASCII whitespace.");
 static PyObject *
-bytes_startswith(PyByteArrayObject *self, PyObject *args)
-{
-    Py_ssize_t start = 0;
-    Py_ssize_t end = PY_SSIZE_T_MAX;
-    PyObject *subobj;
-    int result;
-
-    if (!PyArg_ParseTuple(args, "O|O&O&:startswith", &subobj,
-        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
-        return NULL;
-    if (PyTuple_Check(subobj)) {
-        Py_ssize_t i;
-        for (i = 0; i < PyTuple_GET_SIZE(subobj); i++) {
-            result = _bytes_tailmatch(self,
-                                      PyTuple_GET_ITEM(subobj, i),
-                                      start, end, -1);
-            if (result == -1)
-                return NULL;
-            else if (result) {
-                Py_RETURN_TRUE;
-            }
-        }
-        Py_RETURN_FALSE;
-    }
-    result = _bytes_tailmatch(self, subobj, start, end, -1);
-    if (result == -1)
-        return NULL;
-    else
-        return PyBool_FromLong(result);
+string_rstrip(PyBytesObject *self, PyObject *args)
+{
+	if (PyTuple_GET_SIZE(args) == 0)
+		return do_strip(self, RIGHTSTRIP); /* Common case */
+	else
+		return do_argstrip(self, RIGHTSTRIP, args);
 }
 
-PyDoc_STRVAR(endswith__doc__,
-"B.endswith(suffix [,start [,end]]) -> bool\n\
+
+PyDoc_STRVAR(count__doc__,
+"B.count(sub [,start [,end]]) -> int\n\
 \n\
-Return True if B ends with the specified suffix, False otherwise.\n\
-With optional start, test B beginning at that position.\n\
-With optional end, stop comparing B at that position.\n\
-suffix can also be a tuple of strings to try.");
+Return the number of non-overlapping occurrences of substring sub in\n\
+string S[start:end].  Optional arguments start and end are interpreted\n\
+as in slice notation.");
 
 static PyObject *
-bytes_endswith(PyByteArrayObject *self, PyObject *args)
-{
-    Py_ssize_t start = 0;
-    Py_ssize_t end = PY_SSIZE_T_MAX;
-    PyObject *subobj;
-    int result;
-
-    if (!PyArg_ParseTuple(args, "O|O&O&:endswith", &subobj,
-        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
-        return NULL;
-    if (PyTuple_Check(subobj)) {
-        Py_ssize_t i;
-        for (i = 0; i < PyTuple_GET_SIZE(subobj); i++) {
-            result = _bytes_tailmatch(self,
-                                      PyTuple_GET_ITEM(subobj, i),
-                                      start, end, +1);
-            if (result == -1)
-                return NULL;
-            else if (result) {
-                Py_RETURN_TRUE;
-            }
-        }
-        Py_RETURN_FALSE;
-    }
-    result = _bytes_tailmatch(self, subobj, start, end, +1);
-    if (result == -1)
-        return NULL;
-    else
-        return PyBool_FromLong(result);
+string_count(PyBytesObject *self, PyObject *args)
+{
+	PyObject *sub_obj;
+	const char *str = PyBytes_AS_STRING(self), *sub;
+	Py_ssize_t sub_len;
+	Py_ssize_t start = 0, end = PY_SSIZE_T_MAX;
+
+	if (!PyArg_ParseTuple(args, "O|O&O&:count", &sub_obj,
+		_PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+		return NULL;
+
+	if (PyBytes_Check(sub_obj)) {
+		sub = PyBytes_AS_STRING(sub_obj);
+		sub_len = PyBytes_GET_SIZE(sub_obj);
+	}
+	else if (PyObject_AsCharBuffer(sub_obj, &sub, &sub_len))
+		return NULL;
+
+	string_adjust_indices(&start, &end, PyBytes_GET_SIZE(self));
+
+	return PyLong_FromSsize_t(
+		stringlib_count(str + start, end - start, sub, sub_len)
+		);
 }
 
 
 PyDoc_STRVAR(translate__doc__,
-"B.translate(table[, deletechars]) -> bytearray\n\
+"B.translate(table[, deletechars]) -> bytes\n\
 \n\
 Return a copy of B, where all characters occurring in the\n\
 optional argument deletechars are removed, and the remaining\n\
@@ -1347,95 +1837,105 @@ characters have been mapped through the given translation\n\
 table, which must be a bytes object of length 256.");
 
 static PyObject *
-bytes_translate(PyByteArrayObject *self, PyObject *args)
-{
-    register char *input, *output;
-    register const char *table;
-    register Py_ssize_t i, c, changed = 0;
-    PyObject *input_obj = (PyObject*)self;
-    const char *output_start;
-    Py_ssize_t inlen;
-    PyObject *result;
-    int trans_table[256];
-    PyObject *tableobj, *delobj = NULL;
-    Py_buffer vtable, vdel;
-
-    if (!PyArg_UnpackTuple(args, "translate", 1, 2,
-                           &tableobj, &delobj))
-          return NULL;
-
-    if (_getbuffer(tableobj, &vtable) < 0)
-        return NULL;
-
-    if (vtable.len != 256) {
-        PyErr_SetString(PyExc_ValueError,
-                        "translation table must be 256 characters long");
-        result = NULL;
-        goto done;
-    }
+string_translate(PyBytesObject *self, PyObject *args)
+{
+	register char *input, *output;
+	const char *table;
+	register Py_ssize_t i, c, changed = 0;
+	PyObject *input_obj = (PyObject*)self;
+	const char *output_start, *del_table=NULL;
+	Py_ssize_t inlen, tablen, dellen = 0;
+	PyObject *result;
+	int trans_table[256];
+	PyObject *tableobj, *delobj = NULL;
+
+	if (!PyArg_UnpackTuple(args, "translate", 1, 2,
+			      &tableobj, &delobj))
+		return NULL;
+
+	if (PyBytes_Check(tableobj)) {
+		table = PyBytes_AS_STRING(tableobj);
+		tablen = PyBytes_GET_SIZE(tableobj);
+	}
+	else if (tableobj == Py_None) {
+		table = NULL;
+		tablen = 256;
+	}
+	else if (PyObject_AsCharBuffer(tableobj, &table, &tablen))
+		return NULL;
 
-    if (delobj != NULL) {
-        if (_getbuffer(delobj, &vdel) < 0) {
-            result = NULL;
-            goto done;
-        }
-    }
-    else {
-        vdel.buf = NULL;
-        vdel.len = 0;
-    }
+	if (tablen != 256) {
+		PyErr_SetString(PyExc_ValueError,
+		  "translation table must be 256 characters long");
+		return NULL;
+	}
 
-    table = (const char *)vtable.buf;
-    inlen = PyByteArray_GET_SIZE(input_obj);
-    result = PyByteArray_FromStringAndSize((char *)NULL, inlen);
-    if (result == NULL)
-        goto done;
-    output_start = output = PyByteArray_AsString(result);
-    input = PyByteArray_AS_STRING(input_obj);
-
-    if (vdel.len == 0) {
-        /* If no deletions are required, use faster code */
-        for (i = inlen; --i >= 0; ) {
-            c = Py_CHARMASK(*input++);
-            if (Py_CHARMASK((*output++ = table[c])) != c)
-                changed = 1;
-        }
-        if (changed || !PyByteArray_CheckExact(input_obj))
-            goto done;
-        Py_DECREF(result);
-        Py_INCREF(input_obj);
-        result = input_obj;
-        goto done;
-    }
+	if (delobj != NULL) {
+		if (PyBytes_Check(delobj)) {
+			del_table = PyBytes_AS_STRING(delobj);
+			dellen = PyBytes_GET_SIZE(delobj);
+		}
+		else if (PyUnicode_Check(delobj)) {
+			PyErr_SetString(PyExc_TypeError,
+			"deletions are implemented differently for unicode");
+			return NULL;
+		}
+		else if (PyObject_AsCharBuffer(delobj, &del_table, &dellen))
+			return NULL;
+	}
+	else {
+		del_table = NULL;
+		dellen = 0;
+	}
 
-    for (i = 0; i < 256; i++)
-        trans_table[i] = Py_CHARMASK(table[i]);
+	inlen = PyBytes_GET_SIZE(input_obj);
+	result = PyBytes_FromStringAndSize((char *)NULL, inlen);
+	if (result == NULL)
+		return NULL;
+	output_start = output = PyBytes_AsString(result);
+	input = PyBytes_AS_STRING(input_obj);
+
+	if (dellen == 0 && table != NULL) {
+		/* If no deletions are required, use faster code */
+		for (i = inlen; --i >= 0; ) {
+			c = Py_CHARMASK(*input++);
+			if (Py_CHARMASK((*output++ = table[c])) != c)
+				changed = 1;
+		}
+		if (changed || !PyBytes_CheckExact(input_obj))
+			return result;
+		Py_DECREF(result);
+		Py_INCREF(input_obj);
+		return input_obj;
+	}
 
-    for (i = 0; i < vdel.len; i++)
-        trans_table[(int) Py_CHARMASK( ((unsigned char*)vdel.buf)[i] )] = -1;
+	if (table == NULL) {
+		for (i = 0; i < 256; i++)
+			trans_table[i] = Py_CHARMASK(i);
+	} else {
+		for (i = 0; i < 256; i++)
+			trans_table[i] = Py_CHARMASK(table[i]);
+	}
 
-    for (i = inlen; --i >= 0; ) {
-        c = Py_CHARMASK(*input++);
-        if (trans_table[c] != -1)
-            if (Py_CHARMASK(*output++ = (char)trans_table[c]) == c)
-                    continue;
-        changed = 1;
-    }
-    if (!changed && PyByteArray_CheckExact(input_obj)) {
-        Py_DECREF(result);
-        Py_INCREF(input_obj);
-        result = input_obj;
-        goto done;
-    }
-    /* Fix the size of the resulting string */
-    if (inlen > 0)
-        PyByteArray_Resize(result, output - output_start);
+	for (i = 0; i < dellen; i++)
+		trans_table[(int) Py_CHARMASK(del_table[i])] = -1;
 
-done:
-    PyObject_ReleaseBuffer(tableobj, &vtable);
-    if (delobj != NULL)
-        PyObject_ReleaseBuffer(delobj, &vdel);
-    return result;
+	for (i = inlen; --i >= 0; ) {
+		c = Py_CHARMASK(*input++);
+		if (trans_table[c] != -1)
+			if (Py_CHARMASK(*output++ = (char)trans_table[c]) == c)
+				continue;
+		changed = 1;
+	}
+	if (!changed && PyBytes_CheckExact(input_obj)) {
+		Py_DECREF(result);
+		Py_INCREF(input_obj);
+		return input_obj;
+	}
+	/* Fix the size of the resulting string */
+	if (inlen > 0)
+		_PyBytes_Resize(&result, output - output_start);
+	return result;
 }
 
 
@@ -1444,598 +1944,596 @@ done:
 
 /* find and count characters and substrings */
 
-#define findchar(target, target_len, c)                         \
+#define findchar(target, target_len, c)				\
   ((char *)memchr((const void *)(target), c, target_len))
 
-/* Don't call if length < 2 */
-#define Py_STRING_MATCH(target, offset, pattern, length)        \
-  (target[offset] == pattern[0] &&                              \
-   target[offset+length-1] == pattern[length-1] &&              \
-   !memcmp(target+offset+1, pattern+1, length-2) )
-
-
-/* Bytes ops must return a string.  */
-/* If the object is subclass of bytes, create a copy */
-Py_LOCAL(PyByteArrayObject *)
-return_self(PyByteArrayObject *self)
+/* String ops must return a string.  */
+/* If the object is subclass of string, create a copy */
+Py_LOCAL(PyBytesObject *)
+return_self(PyBytesObject *self)
 {
-    if (PyByteArray_CheckExact(self)) {
-        Py_INCREF(self);
-        return (PyByteArrayObject *)self;
-    }
-    return (PyByteArrayObject *)PyByteArray_FromStringAndSize(
-            PyByteArray_AS_STRING(self),
-            PyByteArray_GET_SIZE(self));
+	if (PyBytes_CheckExact(self)) {
+		Py_INCREF(self);
+		return self;
+	}
+	return (PyBytesObject *)PyBytes_FromStringAndSize(
+		PyBytes_AS_STRING(self),
+		PyBytes_GET_SIZE(self));
 }
 
 Py_LOCAL_INLINE(Py_ssize_t)
-countchar(const char *target, Py_ssize_t target_len, char c, Py_ssize_t maxcount)
+countchar(const char *target, int target_len, char c, Py_ssize_t maxcount)
 {
-    Py_ssize_t count=0;
-    const char *start=target;
-    const char *end=target+target_len;
+	Py_ssize_t count=0;
+	const char *start=target;
+	const char *end=target+target_len;
 
-    while ( (start=findchar(start, end-start, c)) != NULL ) {
-        count++;
-        if (count >= maxcount)
-            break;
-        start += 1;
-    }
-    return count;
+	while ( (start=findchar(start, end-start, c)) != NULL ) {
+		count++;
+		if (count >= maxcount)
+			break;
+		start += 1;
+	}
+	return count;
 }
 
 Py_LOCAL(Py_ssize_t)
 findstring(const char *target, Py_ssize_t target_len,
-           const char *pattern, Py_ssize_t pattern_len,
-           Py_ssize_t start,
-           Py_ssize_t end,
-           int direction)
-{
-    if (start < 0) {
-        start += target_len;
-        if (start < 0)
-            start = 0;
-    }
-    if (end > target_len) {
-        end = target_len;
-    } else if (end < 0) {
-        end += target_len;
-        if (end < 0)
-            end = 0;
-    }
+	   const char *pattern, Py_ssize_t pattern_len,
+	   Py_ssize_t start,
+	   Py_ssize_t end,
+	   int direction)
+{
+	if (start < 0) {
+		start += target_len;
+		if (start < 0)
+			start = 0;
+	}
+	if (end > target_len) {
+		end = target_len;
+	} else if (end < 0) {
+		end += target_len;
+		if (end < 0)
+			end = 0;
+	}
 
-    /* zero-length substrings always match at the first attempt */
-    if (pattern_len == 0)
-        return (direction > 0) ? start : end;
+	/* zero-length substrings always match at the first attempt */
+	if (pattern_len == 0)
+		return (direction > 0) ? start : end;
 
-    end -= pattern_len;
+	end -= pattern_len;
 
-    if (direction < 0) {
-        for (; end >= start; end--)
-            if (Py_STRING_MATCH(target, end, pattern, pattern_len))
-                return end;
-    } else {
-        for (; start <= end; start++)
-            if (Py_STRING_MATCH(target, start, pattern, pattern_len))
-                return start;
-    }
-    return -1;
+	if (direction < 0) {
+		for (; end >= start; end--)
+			if (Py_STRING_MATCH(target, end, pattern, pattern_len))
+				return end;
+	} else {
+		for (; start <= end; start++)
+			if (Py_STRING_MATCH(target, start,pattern,pattern_len))
+				return start;
+	}
+	return -1;
 }
 
 Py_LOCAL_INLINE(Py_ssize_t)
 countstring(const char *target, Py_ssize_t target_len,
-            const char *pattern, Py_ssize_t pattern_len,
-            Py_ssize_t start,
-            Py_ssize_t end,
-            int direction, Py_ssize_t maxcount)
+	    const char *pattern, Py_ssize_t pattern_len,
+	    Py_ssize_t start,
+	    Py_ssize_t end,
+	    int direction, Py_ssize_t maxcount)
 {
-    Py_ssize_t count=0;
+	Py_ssize_t count=0;
 
-    if (start < 0) {
-        start += target_len;
-        if (start < 0)
-            start = 0;
-    }
-    if (end > target_len) {
-        end = target_len;
-    } else if (end < 0) {
-        end += target_len;
-        if (end < 0)
-            end = 0;
-    }
+	if (start < 0) {
+		start += target_len;
+		if (start < 0)
+			start = 0;
+	}
+	if (end > target_len) {
+		end = target_len;
+	} else if (end < 0) {
+		end += target_len;
+		if (end < 0)
+			end = 0;
+	}
 
-    /* zero-length substrings match everywhere */
-    if (pattern_len == 0 || maxcount == 0) {
-        if (target_len+1 < maxcount)
-            return target_len+1;
-        return maxcount;
-    }
+	/* zero-length substrings match everywhere */
+	if (pattern_len == 0 || maxcount == 0) {
+		if (target_len+1 < maxcount)
+			return target_len+1;
+		return maxcount;
+	}
 
-    end -= pattern_len;
-    if (direction < 0) {
-        for (; (end >= start); end--)
-            if (Py_STRING_MATCH(target, end, pattern, pattern_len)) {
-                count++;
-                if (--maxcount <= 0) break;
-                end -= pattern_len-1;
-            }
-    } else {
-        for (; (start <= end); start++)
-            if (Py_STRING_MATCH(target, start, pattern, pattern_len)) {
-                count++;
-                if (--maxcount <= 0)
-                    break;
-                start += pattern_len-1;
-            }
-    }
-    return count;
+	end -= pattern_len;
+	if (direction < 0) {
+		for (; (end >= start); end--)
+			if (Py_STRING_MATCH(target, end,pattern,pattern_len)) {
+				count++;
+				if (--maxcount <= 0) break;
+				end -= pattern_len-1;
+			}
+	} else {
+		for (; (start <= end); start++)
+			if (Py_STRING_MATCH(target, start,
+					    pattern, pattern_len)) {
+				count++;
+				if (--maxcount <= 0)
+					break;
+				start += pattern_len-1;
+			}
+	}
+	return count;
 }
 
 
 /* Algorithms for different cases of string replacement */
 
 /* len(self)>=1, from="", len(to)>=1, maxcount>=1 */
-Py_LOCAL(PyByteArrayObject *)
-replace_interleave(PyByteArrayObject *self,
-                   const char *to_s, Py_ssize_t to_len,
-                   Py_ssize_t maxcount)
-{
-    char *self_s, *result_s;
-    Py_ssize_t self_len, result_len;
-    Py_ssize_t count, i, product;
-    PyByteArrayObject *result;
-
-    self_len = PyByteArray_GET_SIZE(self);
-
-    /* 1 at the end plus 1 after every character */
-    count = self_len+1;
-    if (maxcount < count)
-        count = maxcount;
-
-    /* Check for overflow */
-    /*   result_len = count * to_len + self_len; */
-    product = count * to_len;
-    if (product / to_len != count) {
-        PyErr_SetString(PyExc_OverflowError,
-                        "replace string is too long");
-        return NULL;
-    }
-    result_len = product + self_len;
-    if (result_len < 0) {
-        PyErr_SetString(PyExc_OverflowError,
-                        "replace string is too long");
-        return NULL;
-    }
+Py_LOCAL(PyBytesObject *)
+replace_interleave(PyBytesObject *self,
+		   const char *to_s, Py_ssize_t to_len,
+		   Py_ssize_t maxcount)
+{
+	char *self_s, *result_s;
+	Py_ssize_t self_len, result_len;
+	Py_ssize_t count, i, product;
+	PyBytesObject *result;
+
+	self_len = PyBytes_GET_SIZE(self);
+
+	/* 1 at the end plus 1 after every character */
+	count = self_len+1;
+	if (maxcount < count)
+		count = maxcount;
+
+	/* Check for overflow */
+	/*   result_len = count * to_len + self_len; */
+	product = count * to_len;
+	if (product / to_len != count) {
+		PyErr_SetString(PyExc_OverflowError,
+				"replace string is too long");
+		return NULL;
+	}
+	result_len = product + self_len;
+	if (result_len < 0) {
+		PyErr_SetString(PyExc_OverflowError,
+				"replace string is too long");
+		return NULL;
+	}
 
-    if (! (result = (PyByteArrayObject *)
-                     PyByteArray_FromStringAndSize(NULL, result_len)) )
-        return NULL;
+	if (! (result = (PyBytesObject *)
+	                 PyBytes_FromStringAndSize(NULL, result_len)) )
+		return NULL;
 
-    self_s = PyByteArray_AS_STRING(self);
-    result_s = PyByteArray_AS_STRING(result);
+	self_s = PyBytes_AS_STRING(self);
+	result_s = PyBytes_AS_STRING(result);
 
-    /* TODO: special case single character, which doesn't need memcpy */
+	/* TODO: special case single character, which doesn't need memcpy */
 
-    /* Lay the first one down (guaranteed this will occur) */
-    Py_MEMCPY(result_s, to_s, to_len);
-    result_s += to_len;
-    count -= 1;
+	/* Lay the first one down (guaranteed this will occur) */
+	Py_MEMCPY(result_s, to_s, to_len);
+	result_s += to_len;
+	count -= 1;
 
-    for (i=0; i<count; i++) {
-        *result_s++ = *self_s++;
-        Py_MEMCPY(result_s, to_s, to_len);
-        result_s += to_len;
-    }
+	for (i=0; i<count; i++) {
+		*result_s++ = *self_s++;
+		Py_MEMCPY(result_s, to_s, to_len);
+		result_s += to_len;
+	}
 
-    /* Copy the rest of the original string */
-    Py_MEMCPY(result_s, self_s, self_len-i);
+	/* Copy the rest of the original string */
+	Py_MEMCPY(result_s, self_s, self_len-i);
 
-    return result;
+	return result;
 }
 
 /* Special case for deleting a single character */
 /* len(self)>=1, len(from)==1, to="", maxcount>=1 */
-Py_LOCAL(PyByteArrayObject *)
-replace_delete_single_character(PyByteArrayObject *self,
-                                char from_c, Py_ssize_t maxcount)
-{
-    char *self_s, *result_s;
-    char *start, *next, *end;
-    Py_ssize_t self_len, result_len;
-    Py_ssize_t count;
-    PyByteArrayObject *result;
-
-    self_len = PyByteArray_GET_SIZE(self);
-    self_s = PyByteArray_AS_STRING(self);
-
-    count = countchar(self_s, self_len, from_c, maxcount);
-    if (count == 0) {
-        return return_self(self);
-    }
+Py_LOCAL(PyBytesObject *)
+replace_delete_single_character(PyBytesObject *self,
+				char from_c, Py_ssize_t maxcount)
+{
+	char *self_s, *result_s;
+	char *start, *next, *end;
+	Py_ssize_t self_len, result_len;
+	Py_ssize_t count;
+	PyBytesObject *result;
+
+	self_len = PyBytes_GET_SIZE(self);
+	self_s = PyBytes_AS_STRING(self);
+
+	count = countchar(self_s, self_len, from_c, maxcount);
+	if (count == 0) {
+		return return_self(self);
+	}
 
-    result_len = self_len - count;  /* from_len == 1 */
-    assert(result_len>=0);
-
-    if ( (result = (PyByteArrayObject *)
-                    PyByteArray_FromStringAndSize(NULL, result_len)) == NULL)
-        return NULL;
-    result_s = PyByteArray_AS_STRING(result);
-
-    start = self_s;
-    end = self_s + self_len;
-    while (count-- > 0) {
-        next = findchar(start, end-start, from_c);
-        if (next == NULL)
-            break;
-        Py_MEMCPY(result_s, start, next-start);
-        result_s += (next-start);
-        start = next+1;
-    }
-    Py_MEMCPY(result_s, start, end-start);
+	result_len = self_len - count;  /* from_len == 1 */
+	assert(result_len>=0);
+
+	if ( (result = (PyBytesObject *)
+	                PyBytes_FromStringAndSize(NULL, result_len)) == NULL)
+		return NULL;
+	result_s = PyBytes_AS_STRING(result);
+
+	start = self_s;
+	end = self_s + self_len;
+	while (count-- > 0) {
+		next = findchar(start, end-start, from_c);
+		if (next == NULL)
+			break;
+		Py_MEMCPY(result_s, start, next-start);
+		result_s += (next-start);
+		start = next+1;
+	}
+	Py_MEMCPY(result_s, start, end-start);
 
-    return result;
+	return result;
 }
 
 /* len(self)>=1, len(from)>=2, to="", maxcount>=1 */
 
-Py_LOCAL(PyByteArrayObject *)
-replace_delete_substring(PyByteArrayObject *self,
-                         const char *from_s, Py_ssize_t from_len,
-                         Py_ssize_t maxcount)
-{
-    char *self_s, *result_s;
-    char *start, *next, *end;
-    Py_ssize_t self_len, result_len;
-    Py_ssize_t count, offset;
-    PyByteArrayObject *result;
-
-    self_len = PyByteArray_GET_SIZE(self);
-    self_s = PyByteArray_AS_STRING(self);
-
-    count = countstring(self_s, self_len,
-                        from_s, from_len,
-                        0, self_len, 1,
-                        maxcount);
-
-    if (count == 0) {
-        /* no matches */
-        return return_self(self);
-    }
+Py_LOCAL(PyBytesObject *)
+replace_delete_substring(PyBytesObject *self,
+			 const char *from_s, Py_ssize_t from_len,
+			 Py_ssize_t maxcount) {
+	char *self_s, *result_s;
+	char *start, *next, *end;
+	Py_ssize_t self_len, result_len;
+	Py_ssize_t count, offset;
+	PyBytesObject *result;
+
+	self_len = PyBytes_GET_SIZE(self);
+	self_s = PyBytes_AS_STRING(self);
+
+	count = countstring(self_s, self_len,
+			    from_s, from_len,
+			    0, self_len, 1,
+			    maxcount);
+
+	if (count == 0) {
+		/* no matches */
+		return return_self(self);
+	}
 
-    result_len = self_len - (count * from_len);
-    assert (result_len>=0);
+	result_len = self_len - (count * from_len);
+	assert (result_len>=0);
 
-    if ( (result = (PyByteArrayObject *)
-        PyByteArray_FromStringAndSize(NULL, result_len)) == NULL )
-            return NULL;
+	if ( (result = (PyBytesObject *)
+	      PyBytes_FromStringAndSize(NULL, result_len)) == NULL )
+		return NULL;
 
-    result_s = PyByteArray_AS_STRING(result);
+	result_s = PyBytes_AS_STRING(result);
 
-    start = self_s;
-    end = self_s + self_len;
-    while (count-- > 0) {
-        offset = findstring(start, end-start,
-                            from_s, from_len,
-                            0, end-start, FORWARD);
-        if (offset == -1)
-            break;
-        next = start + offset;
+	start = self_s;
+	end = self_s + self_len;
+	while (count-- > 0) {
+		offset = findstring(start, end-start,
+				    from_s, from_len,
+				    0, end-start, FORWARD);
+		if (offset == -1)
+			break;
+		next = start + offset;
 
-        Py_MEMCPY(result_s, start, next-start);
+		Py_MEMCPY(result_s, start, next-start);
 
-        result_s += (next-start);
-        start = next+from_len;
-    }
-    Py_MEMCPY(result_s, start, end-start);
-    return result;
+		result_s += (next-start);
+		start = next+from_len;
+	}
+	Py_MEMCPY(result_s, start, end-start);
+	return result;
 }
 
 /* len(self)>=1, len(from)==len(to)==1, maxcount>=1 */
-Py_LOCAL(PyByteArrayObject *)
-replace_single_character_in_place(PyByteArrayObject *self,
-                                  char from_c, char to_c,
-                                  Py_ssize_t maxcount)
+Py_LOCAL(PyBytesObject *)
+replace_single_character_in_place(PyBytesObject *self,
+				  char from_c, char to_c,
+				  Py_ssize_t maxcount)
 {
-        char *self_s, *result_s, *start, *end, *next;
-        Py_ssize_t self_len;
-        PyByteArrayObject *result;
+	char *self_s, *result_s, *start, *end, *next;
+	Py_ssize_t self_len;
+	PyBytesObject *result;
 
-        /* The result string will be the same size */
-        self_s = PyByteArray_AS_STRING(self);
-        self_len = PyByteArray_GET_SIZE(self);
+	/* The result string will be the same size */
+	self_s = PyBytes_AS_STRING(self);
+	self_len = PyBytes_GET_SIZE(self);
 
-        next = findchar(self_s, self_len, from_c);
-
-        if (next == NULL) {
-                /* No matches; return the original bytes */
-                return return_self(self);
-        }
-
-        /* Need to make a new bytes */
-        result = (PyByteArrayObject *) PyByteArray_FromStringAndSize(NULL, self_len);
-        if (result == NULL)
-                return NULL;
-        result_s = PyByteArray_AS_STRING(result);
-        Py_MEMCPY(result_s, self_s, self_len);
+	next = findchar(self_s, self_len, from_c);
 
-        /* change everything in-place, starting with this one */
-        start =  result_s + (next-self_s);
-        *start = to_c;
-        start++;
-        end = result_s + self_len;
+	if (next == NULL) {
+		/* No matches; return the original string */
+		return return_self(self);
+	}
 
-        while (--maxcount > 0) {
-                next = findchar(start, end-start, from_c);
-                if (next == NULL)
-                        break;
-                *next = to_c;
-                start = next+1;
-        }
+	/* Need to make a new string */
+	result = (PyBytesObject *) PyBytes_FromStringAndSize(NULL, self_len);
+	if (result == NULL)
+		return NULL;
+	result_s = PyBytes_AS_STRING(result);
+	Py_MEMCPY(result_s, self_s, self_len);
+
+	/* change everything in-place, starting with this one */
+	start =  result_s + (next-self_s);
+	*start = to_c;
+	start++;
+	end = result_s + self_len;
+
+	while (--maxcount > 0) {
+		next = findchar(start, end-start, from_c);
+		if (next == NULL)
+			break;
+		*next = to_c;
+		start = next+1;
+	}
 
-        return result;
+	return result;
 }
 
 /* len(self)>=1, len(from)==len(to)>=2, maxcount>=1 */
-Py_LOCAL(PyByteArrayObject *)
-replace_substring_in_place(PyByteArrayObject *self,
-                           const char *from_s, Py_ssize_t from_len,
-                           const char *to_s, Py_ssize_t to_len,
-                           Py_ssize_t maxcount)
-{
-    char *result_s, *start, *end;
-    char *self_s;
-    Py_ssize_t self_len, offset;
-    PyByteArrayObject *result;
-
-    /* The result bytes will be the same size */
-
-    self_s = PyByteArray_AS_STRING(self);
-    self_len = PyByteArray_GET_SIZE(self);
-
-    offset = findstring(self_s, self_len,
-                        from_s, from_len,
-                        0, self_len, FORWARD);
-    if (offset == -1) {
-        /* No matches; return the original bytes */
-        return return_self(self);
-    }
+Py_LOCAL(PyBytesObject *)
+replace_substring_in_place(PyBytesObject *self,
+			   const char *from_s, Py_ssize_t from_len,
+			   const char *to_s, Py_ssize_t to_len,
+			   Py_ssize_t maxcount)
+{
+	char *result_s, *start, *end;
+	char *self_s;
+	Py_ssize_t self_len, offset;
+	PyBytesObject *result;
+
+	/* The result string will be the same size */
+
+	self_s = PyBytes_AS_STRING(self);
+	self_len = PyBytes_GET_SIZE(self);
+
+	offset = findstring(self_s, self_len,
+			    from_s, from_len,
+			    0, self_len, FORWARD);
+	if (offset == -1) {
+		/* No matches; return the original string */
+		return return_self(self);
+	}
 
-    /* Need to make a new bytes */
-    result = (PyByteArrayObject *) PyByteArray_FromStringAndSize(NULL, self_len);
-    if (result == NULL)
-        return NULL;
-    result_s = PyByteArray_AS_STRING(result);
-    Py_MEMCPY(result_s, self_s, self_len);
-
-    /* change everything in-place, starting with this one */
-    start =  result_s + offset;
-    Py_MEMCPY(start, to_s, from_len);
-    start += from_len;
-    end = result_s + self_len;
-
-    while ( --maxcount > 0) {
-        offset = findstring(start, end-start,
-                            from_s, from_len,
-                            0, end-start, FORWARD);
-        if (offset==-1)
-            break;
-        Py_MEMCPY(start+offset, to_s, from_len);
-        start += offset+from_len;
-    }
+	/* Need to make a new string */
+	result = (PyBytesObject *) PyBytes_FromStringAndSize(NULL, self_len);
+	if (result == NULL)
+		return NULL;
+	result_s = PyBytes_AS_STRING(result);
+	Py_MEMCPY(result_s, self_s, self_len);
+
+	/* change everything in-place, starting with this one */
+	start =  result_s + offset;
+	Py_MEMCPY(start, to_s, from_len);
+	start += from_len;
+	end = result_s + self_len;
+
+	while ( --maxcount > 0) {
+		offset = findstring(start, end-start,
+				    from_s, from_len,
+				    0, end-start, FORWARD);
+		if (offset==-1)
+			break;
+		Py_MEMCPY(start+offset, to_s, from_len);
+		start += offset+from_len;
+	}
 
-    return result;
+	return result;
 }
 
 /* len(self)>=1, len(from)==1, len(to)>=2, maxcount>=1 */
-Py_LOCAL(PyByteArrayObject *)
-replace_single_character(PyByteArrayObject *self,
-                         char from_c,
-                         const char *to_s, Py_ssize_t to_len,
-                         Py_ssize_t maxcount)
-{
-    char *self_s, *result_s;
-    char *start, *next, *end;
-    Py_ssize_t self_len, result_len;
-    Py_ssize_t count, product;
-    PyByteArrayObject *result;
-
-    self_s = PyByteArray_AS_STRING(self);
-    self_len = PyByteArray_GET_SIZE(self);
-
-    count = countchar(self_s, self_len, from_c, maxcount);
-    if (count == 0) {
-        /* no matches, return unchanged */
-        return return_self(self);
-    }
+Py_LOCAL(PyBytesObject *)
+replace_single_character(PyBytesObject *self,
+			 char from_c,
+			 const char *to_s, Py_ssize_t to_len,
+			 Py_ssize_t maxcount)
+{
+	char *self_s, *result_s;
+	char *start, *next, *end;
+	Py_ssize_t self_len, result_len;
+	Py_ssize_t count, product;
+	PyBytesObject *result;
+
+	self_s = PyBytes_AS_STRING(self);
+	self_len = PyBytes_GET_SIZE(self);
+
+	count = countchar(self_s, self_len, from_c, maxcount);
+	if (count == 0) {
+		/* no matches, return unchanged */
+		return return_self(self);
+	}
 
-    /* use the difference between current and new, hence the "-1" */
-    /*   result_len = self_len + count * (to_len-1)  */
-    product = count * (to_len-1);
-    if (product / (to_len-1) != count) {
-        PyErr_SetString(PyExc_OverflowError, "replace bytes is too long");
-        return NULL;
-    }
-    result_len = self_len + product;
-    if (result_len < 0) {
-            PyErr_SetString(PyExc_OverflowError, "replace bytes is too long");
-            return NULL;
-    }
+	/* use the difference between current and new, hence the "-1" */
+	/*   result_len = self_len + count * (to_len-1)  */
+	product = count * (to_len-1);
+	if (product / (to_len-1) != count) {
+		PyErr_SetString(PyExc_OverflowError,
+				"replace string is too long");
+		return NULL;
+	}
+	result_len = self_len + product;
+	if (result_len < 0) {
+		PyErr_SetString(PyExc_OverflowError,
+				"replace string is too long");
+		return NULL;
+	}
 
-    if ( (result = (PyByteArrayObject *)
-          PyByteArray_FromStringAndSize(NULL, result_len)) == NULL)
-            return NULL;
-    result_s = PyByteArray_AS_STRING(result);
-
-    start = self_s;
-    end = self_s + self_len;
-    while (count-- > 0) {
-        next = findchar(start, end-start, from_c);
-        if (next == NULL)
-            break;
-
-        if (next == start) {
-            /* replace with the 'to' */
-            Py_MEMCPY(result_s, to_s, to_len);
-            result_s += to_len;
-            start += 1;
-        } else {
-            /* copy the unchanged old then the 'to' */
-            Py_MEMCPY(result_s, start, next-start);
-            result_s += (next-start);
-            Py_MEMCPY(result_s, to_s, to_len);
-            result_s += to_len;
-            start = next+1;
-        }
-    }
-    /* Copy the remainder of the remaining bytes */
-    Py_MEMCPY(result_s, start, end-start);
+	if ( (result = (PyBytesObject *)
+	      PyBytes_FromStringAndSize(NULL, result_len)) == NULL)
+		return NULL;
+	result_s = PyBytes_AS_STRING(result);
+
+	start = self_s;
+	end = self_s + self_len;
+	while (count-- > 0) {
+		next = findchar(start, end-start, from_c);
+		if (next == NULL)
+			break;
+
+		if (next == start) {
+			/* replace with the 'to' */
+			Py_MEMCPY(result_s, to_s, to_len);
+			result_s += to_len;
+			start += 1;
+		} else {
+			/* copy the unchanged old then the 'to' */
+			Py_MEMCPY(result_s, start, next-start);
+			result_s += (next-start);
+			Py_MEMCPY(result_s, to_s, to_len);
+			result_s += to_len;
+			start = next+1;
+		}
+	}
+	/* Copy the remainder of the remaining string */
+	Py_MEMCPY(result_s, start, end-start);
 
-    return result;
+	return result;
 }
 
 /* len(self)>=1, len(from)>=2, len(to)>=2, maxcount>=1 */
-Py_LOCAL(PyByteArrayObject *)
-replace_substring(PyByteArrayObject *self,
-                  const char *from_s, Py_ssize_t from_len,
-                  const char *to_s, Py_ssize_t to_len,
-                  Py_ssize_t maxcount)
-{
-    char *self_s, *result_s;
-    char *start, *next, *end;
-    Py_ssize_t self_len, result_len;
-    Py_ssize_t count, offset, product;
-    PyByteArrayObject *result;
-
-    self_s = PyByteArray_AS_STRING(self);
-    self_len = PyByteArray_GET_SIZE(self);
-
-    count = countstring(self_s, self_len,
-                        from_s, from_len,
-                        0, self_len, FORWARD, maxcount);
-    if (count == 0) {
-        /* no matches, return unchanged */
-        return return_self(self);
-    }
+Py_LOCAL(PyBytesObject *)
+replace_substring(PyBytesObject *self,
+		  const char *from_s, Py_ssize_t from_len,
+		  const char *to_s, Py_ssize_t to_len,
+		  Py_ssize_t maxcount) {
+	char *self_s, *result_s;
+	char *start, *next, *end;
+	Py_ssize_t self_len, result_len;
+	Py_ssize_t count, offset, product;
+	PyBytesObject *result;
+
+	self_s = PyBytes_AS_STRING(self);
+	self_len = PyBytes_GET_SIZE(self);
+
+	count = countstring(self_s, self_len,
+			    from_s, from_len,
+			    0, self_len, FORWARD, maxcount);
+	if (count == 0) {
+		/* no matches, return unchanged */
+		return return_self(self);
+	}
 
-    /* Check for overflow */
-    /*    result_len = self_len + count * (to_len-from_len) */
-    product = count * (to_len-from_len);
-    if (product / (to_len-from_len) != count) {
-        PyErr_SetString(PyExc_OverflowError, "replace bytes is too long");
-        return NULL;
-    }
-    result_len = self_len + product;
-    if (result_len < 0) {
-        PyErr_SetString(PyExc_OverflowError, "replace bytes is too long");
-        return NULL;
-    }
+	/* Check for overflow */
+	/*    result_len = self_len + count * (to_len-from_len) */
+	product = count * (to_len-from_len);
+	if (product / (to_len-from_len) != count) {
+		PyErr_SetString(PyExc_OverflowError,
+				"replace string is too long");
+		return NULL;
+	}
+	result_len = self_len + product;
+	if (result_len < 0) {
+		PyErr_SetString(PyExc_OverflowError,
+				"replace string is too long");
+		return NULL;
+	}
 
-    if ( (result = (PyByteArrayObject *)
-          PyByteArray_FromStringAndSize(NULL, result_len)) == NULL)
-        return NULL;
-    result_s = PyByteArray_AS_STRING(result);
-
-    start = self_s;
-    end = self_s + self_len;
-    while (count-- > 0) {
-        offset = findstring(start, end-start,
-                            from_s, from_len,
-                            0, end-start, FORWARD);
-        if (offset == -1)
-            break;
-        next = start+offset;
-        if (next == start) {
-            /* replace with the 'to' */
-            Py_MEMCPY(result_s, to_s, to_len);
-            result_s += to_len;
-            start += from_len;
-        } else {
-            /* copy the unchanged old then the 'to' */
-            Py_MEMCPY(result_s, start, next-start);
-            result_s += (next-start);
-            Py_MEMCPY(result_s, to_s, to_len);
-            result_s += to_len;
-            start = next+from_len;
-        }
-    }
-    /* Copy the remainder of the remaining bytes */
-    Py_MEMCPY(result_s, start, end-start);
+	if ( (result = (PyBytesObject *)
+	      PyBytes_FromStringAndSize(NULL, result_len)) == NULL)
+		return NULL;
+	result_s = PyBytes_AS_STRING(result);
+
+	start = self_s;
+	end = self_s + self_len;
+	while (count-- > 0) {
+		offset = findstring(start, end-start,
+				    from_s, from_len,
+				    0, end-start, FORWARD);
+		if (offset == -1)
+			break;
+		next = start+offset;
+		if (next == start) {
+			/* replace with the 'to' */
+			Py_MEMCPY(result_s, to_s, to_len);
+			result_s += to_len;
+			start += from_len;
+		} else {
+			/* copy the unchanged old then the 'to' */
+			Py_MEMCPY(result_s, start, next-start);
+			result_s += (next-start);
+			Py_MEMCPY(result_s, to_s, to_len);
+			result_s += to_len;
+			start = next+from_len;
+		}
+	}
+	/* Copy the remainder of the remaining string */
+	Py_MEMCPY(result_s, start, end-start);
 
-    return result;
+	return result;
 }
 
 
-Py_LOCAL(PyByteArrayObject *)
-replace(PyByteArrayObject *self,
-        const char *from_s, Py_ssize_t from_len,
-        const char *to_s, Py_ssize_t to_len,
-        Py_ssize_t maxcount)
+Py_LOCAL(PyBytesObject *)
+replace(PyBytesObject *self,
+	const char *from_s, Py_ssize_t from_len,
+	const char *to_s, Py_ssize_t to_len,
+	Py_ssize_t maxcount)
 {
-    if (maxcount < 0) {
-        maxcount = PY_SSIZE_T_MAX;
-    } else if (maxcount == 0 || PyByteArray_GET_SIZE(self) == 0) {
-        /* nothing to do; return the original bytes */
-        return return_self(self);
-    }
+	if (maxcount < 0) {
+		maxcount = PY_SSIZE_T_MAX;
+	} else if (maxcount == 0 || PyBytes_GET_SIZE(self) == 0) {
+		/* nothing to do; return the original string */
+		return return_self(self);
+	}
 
-    if (maxcount == 0 ||
-        (from_len == 0 && to_len == 0)) {
-        /* nothing to do; return the original bytes */
-        return return_self(self);
-    }
+	if (maxcount == 0 ||
+	    (from_len == 0 && to_len == 0)) {
+		/* nothing to do; return the original string */
+		return return_self(self);
+	}
 
-    /* Handle zero-length special cases */
+	/* Handle zero-length special cases */
 
-    if (from_len == 0) {
-        /* insert the 'to' bytes everywhere.   */
-        /*    >>> "Python".replace("", ".")     */
-        /*    '.P.y.t.h.o.n.'                   */
-        return replace_interleave(self, to_s, to_len, maxcount);
-    }
+	if (from_len == 0) {
+		/* insert the 'to' string everywhere.   */
+		/*    >>> "Python".replace("", ".")     */
+		/*    '.P.y.t.h.o.n.'                   */
+		return replace_interleave(self, to_s, to_len, maxcount);
+	}
 
-    /* Except for "".replace("", "A") == "A" there is no way beyond this */
-    /* point for an empty self bytes to generate a non-empty bytes */
-    /* Special case so the remaining code always gets a non-empty bytes */
-    if (PyByteArray_GET_SIZE(self) == 0) {
-        return return_self(self);
-    }
+	/* Except for "".replace("", "A") == "A" there is no way beyond this */
+	/* point for an empty self string to generate a non-empty string */
+	/* Special case so the remaining code always gets a non-empty string */
+	if (PyBytes_GET_SIZE(self) == 0) {
+		return return_self(self);
+	}
 
-    if (to_len == 0) {
-        /* delete all occurances of 'from' bytes */
-        if (from_len == 1) {
-            return replace_delete_single_character(
-                    self, from_s[0], maxcount);
-        } else {
-            return replace_delete_substring(self, from_s, from_len, maxcount);
-        }
-    }
+	if (to_len == 0) {
+		/* delete all occurances of 'from' string */
+		if (from_len == 1) {
+			return replace_delete_single_character(
+				self, from_s[0], maxcount);
+		} else {
+			return replace_delete_substring(self, from_s,
+							from_len, maxcount);
+		}
+	}
 
-    /* Handle special case where both bytes have the same length */
-
-    if (from_len == to_len) {
-        if (from_len == 1) {
-            return replace_single_character_in_place(
-                    self,
-                    from_s[0],
-                    to_s[0],
-                    maxcount);
-        } else {
-            return replace_substring_in_place(
-                self, from_s, from_len, to_s, to_len, maxcount);
-        }
-    }
+	/* Handle special case where both strings have the same length */
+
+	if (from_len == to_len) {
+		if (from_len == 1) {
+			return replace_single_character_in_place(
+				self,
+				from_s[0],
+				to_s[0],
+				maxcount);
+		} else {
+			return replace_substring_in_place(
+				self, from_s, from_len, to_s, to_len,
+				maxcount);
+		}
+	}
 
-    /* Otherwise use the more generic algorithms */
-    if (from_len == 1) {
-        return replace_single_character(self, from_s[0],
-                                        to_s, to_len, maxcount);
-    } else {
-        /* len('from')>=2, len('to')>=1 */
-        return replace_substring(self, from_s, from_len, to_s, to_len, maxcount);
-    }
+	/* Otherwise use the more generic algorithms */
+	if (from_len == 1) {
+		return replace_single_character(self, from_s[0],
+						to_s, to_len, maxcount);
+	} else {
+		/* len('from')>=2, len('to')>=1 */
+		return replace_substring(self, from_s, from_len, to_s, to_len,
+					 maxcount);
+	}
 }
 
-
 PyDoc_STRVAR(replace__doc__,
 "B.replace(old, new[, count]) -> bytes\n\
 \n\
@@ -2044,1257 +2542,888 @@ old replaced by new.  If the optional argument count is\n\
 given, only the first count occurrences are replaced.");
 
 static PyObject *
-bytes_replace(PyByteArrayObject *self, PyObject *args)
+string_replace(PyBytesObject *self, PyObject *args)
 {
-    Py_ssize_t count = -1;
-    PyObject *from, *to, *res;
-    Py_buffer vfrom, vto;
+	Py_ssize_t count = -1;
+	PyObject *from, *to;
+	const char *from_s, *to_s;
+	Py_ssize_t from_len, to_len;
 
-    if (!PyArg_ParseTuple(args, "OO|n:replace", &from, &to, &count))
-        return NULL;
+	if (!PyArg_ParseTuple(args, "OO|n:replace", &from, &to, &count))
+		return NULL;
 
-    if (_getbuffer(from, &vfrom) < 0)
-        return NULL;
-    if (_getbuffer(to, &vto) < 0) {
-        PyObject_ReleaseBuffer(from, &vfrom);
-        return NULL;
-    }
+	if (PyBytes_Check(from)) {
+		from_s = PyBytes_AS_STRING(from);
+		from_len = PyBytes_GET_SIZE(from);
+	}
+	else if (PyObject_AsCharBuffer(from, &from_s, &from_len))
+		return NULL;
 
-    res = (PyObject *)replace((PyByteArrayObject *) self,
-                              vfrom.buf, vfrom.len,
-                              vto.buf, vto.len, count);
+	if (PyBytes_Check(to)) {
+		to_s = PyBytes_AS_STRING(to);
+		to_len = PyBytes_GET_SIZE(to);
+	}
+	else if (PyObject_AsCharBuffer(to, &to_s, &to_len))
+		return NULL;
 
-    PyObject_ReleaseBuffer(from, &vfrom);
-    PyObject_ReleaseBuffer(to, &vto);
-    return res;
+	return (PyObject *)replace((PyBytesObject *) self,
+				   from_s, from_len,
+				   to_s, to_len, count);
 }
 
+/** End DALKE **/
 
-/* Overallocate the initial list to reduce the number of reallocs for small
-   split sizes.  Eg, "A A A A A A A A A A".split() (10 elements) has three
-   resizes, to sizes 4, 8, then 16.  Most observed string splits are for human
-   text (roughly 11 words per line) and field delimited data (usually 1-10
-   fields).  For large strings the split algorithms are bandwidth limited
-   so increasing the preallocation likely will not improve things.*/
-
-#define MAX_PREALLOC 12
-
-/* 5 splits gives 6 elements */
-#define PREALLOC_SIZE(maxsplit) \
-    (maxsplit >= MAX_PREALLOC ? MAX_PREALLOC : maxsplit+1)
-
-#define SPLIT_APPEND(data, left, right)                         \
-    str = PyByteArray_FromStringAndSize((data) + (left),       \
-                                     (right) - (left));     \
-    if (str == NULL)                                        \
-        goto onError;                                   \
-    if (PyList_Append(list, str)) {                         \
-        Py_DECREF(str);                                 \
-        goto onError;                                   \
-    }                                                       \
-    else                                                    \
-        Py_DECREF(str);
-
-#define SPLIT_ADD(data, left, right) {                          \
-    str = PyByteArray_FromStringAndSize((data) + (left),       \
-                                     (right) - (left));     \
-    if (str == NULL)                                        \
-        goto onError;                                   \
-    if (count < MAX_PREALLOC) {                             \
-        PyList_SET_ITEM(list, count, str);              \
-    } else {                                                \
-        if (PyList_Append(list, str)) {                 \
-            Py_DECREF(str);                         \
-            goto onError;                           \
-        }                                               \
-        else                                            \
-            Py_DECREF(str);                         \
-    }                                                       \
-    count++; }
-
-/* Always force the list to the expected size. */
-#define FIX_PREALLOC_SIZE(list) Py_SIZE(list) = count
-
-
-Py_LOCAL_INLINE(PyObject *)
-split_char(const char *s, Py_ssize_t len, char ch, Py_ssize_t maxcount)
-{
-    register Py_ssize_t i, j, count = 0;
-    PyObject *str;
-    PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
-
-    if (list == NULL)
-        return NULL;
-
-    i = j = 0;
-    while ((j < len) && (maxcount-- > 0)) {
-        for(; j < len; j++) {
-            /* I found that using memchr makes no difference */
-            if (s[j] == ch) {
-                SPLIT_ADD(s, i, j);
-                i = j = j + 1;
-                break;
-            }
-        }
-    }
-    if (i <= len) {
-        SPLIT_ADD(s, i, len);
-    }
-    FIX_PREALLOC_SIZE(list);
-    return list;
+/* Matches the end (direction >= 0) or start (direction < 0) of self
+ * against substr, using the start and end arguments. Returns
+ * -1 on error, 0 if not found and 1 if found.
+ */
+Py_LOCAL(int)
+_string_tailmatch(PyBytesObject *self, PyObject *substr, Py_ssize_t start,
+		  Py_ssize_t end, int direction)
+{
+	Py_ssize_t len = PyBytes_GET_SIZE(self);
+	Py_ssize_t slen;
+	const char* sub;
+	const char* str;
 
-  onError:
-    Py_DECREF(list);
-    return NULL;
+	if (PyBytes_Check(substr)) {
+		sub = PyBytes_AS_STRING(substr);
+		slen = PyBytes_GET_SIZE(substr);
+	}
+	else if (PyObject_AsCharBuffer(substr, &sub, &slen))
+		return -1;
+	str = PyBytes_AS_STRING(self);
+
+	string_adjust_indices(&start, &end, len);
+
+	if (direction < 0) {
+		/* startswith */
+		if (start+slen > len)
+			return 0;
+	} else {
+		/* endswith */
+		if (end-start < slen || start > len)
+			return 0;
+
+		if (end-slen > start)
+			start = end - slen;
+	}
+	if (end-start >= slen)
+		return ! memcmp(str+start, sub, slen);
+	return 0;
 }
 
 
-Py_LOCAL_INLINE(PyObject *)
-split_whitespace(const char *s, Py_ssize_t len, Py_ssize_t maxcount)
-{
-    register Py_ssize_t i, j, count = 0;
-    PyObject *str;
-    PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
-
-    if (list == NULL)
-        return NULL;
-
-    for (i = j = 0; i < len; ) {
-        /* find a token */
-        while (i < len && ISSPACE(s[i]))
-            i++;
-        j = i;
-        while (i < len && !ISSPACE(s[i]))
-            i++;
-        if (j < i) {
-            if (maxcount-- <= 0)
-                break;
-            SPLIT_ADD(s, j, i);
-            while (i < len && ISSPACE(s[i]))
-                i++;
-            j = i;
-        }
-    }
-    if (j < len) {
-        SPLIT_ADD(s, j, len);
-    }
-    FIX_PREALLOC_SIZE(list);
-    return list;
-
-  onError:
-    Py_DECREF(list);
-    return NULL;
-}
-
-PyDoc_STRVAR(split__doc__,
-"B.split([sep[, maxsplit]]) -> list of bytearray\n\
+PyDoc_STRVAR(startswith__doc__,
+"B.startswith(prefix [,start [,end]]) -> bool\n\
 \n\
-Return a list of the sections in B, using sep as the delimiter.\n\
-If sep is not given, B is split on ASCII whitespace characters\n\
-(space, tab, return, newline, formfeed, vertical tab).\n\
-If maxsplit is given, at most maxsplit splits are done.");
+Return True if B starts with the specified prefix, False otherwise.\n\
+With optional start, test B beginning at that position.\n\
+With optional end, stop comparing B at that position.\n\
+prefix can also be a tuple of strings to try.");
 
 static PyObject *
-bytes_split(PyByteArrayObject *self, PyObject *args)
-{
-    Py_ssize_t len = PyByteArray_GET_SIZE(self), n, i, j;
-    Py_ssize_t maxsplit = -1, count = 0;
-    const char *s = PyByteArray_AS_STRING(self), *sub;
-    PyObject *list, *str, *subobj = Py_None;
-    Py_buffer vsub;
-#ifdef USE_FAST
-    Py_ssize_t pos;
-#endif
-
-    if (!PyArg_ParseTuple(args, "|On:split", &subobj, &maxsplit))
-        return NULL;
-    if (maxsplit < 0)
-        maxsplit = PY_SSIZE_T_MAX;
-
-    if (subobj == Py_None)
-        return split_whitespace(s, len, maxsplit);
-
-    if (_getbuffer(subobj, &vsub) < 0)
-        return NULL;
-    sub = vsub.buf;
-    n = vsub.len;
-
-    if (n == 0) {
-        PyErr_SetString(PyExc_ValueError, "empty separator");
-        PyObject_ReleaseBuffer(subobj, &vsub);
-        return NULL;
-    }
-    if (n == 1)
-        return split_char(s, len, sub[0], maxsplit);
-
-    list = PyList_New(PREALLOC_SIZE(maxsplit));
-    if (list == NULL) {
-        PyObject_ReleaseBuffer(subobj, &vsub);
-        return NULL;
-    }
-
-#ifdef USE_FAST
-    i = j = 0;
-    while (maxsplit-- > 0) {
-        pos = fastsearch(s+i, len-i, sub, n, FAST_SEARCH);
-        if (pos < 0)
-                break;
-        j = i+pos;
-        SPLIT_ADD(s, i, j);
-        i = j + n;
-    }
-#else
-    i = j = 0;
-    while ((j+n <= len) && (maxsplit-- > 0)) {
-        for (; j+n <= len; j++) {
-            if (Py_STRING_MATCH(s, j, sub, n)) {
-                SPLIT_ADD(s, i, j);
-                i = j = j + n;
-                break;
-            }
-        }
-    }
-#endif
-    SPLIT_ADD(s, i, len);
-    FIX_PREALLOC_SIZE(list);
-    PyObject_ReleaseBuffer(subobj, &vsub);
-    return list;
-
-  onError:
-    Py_DECREF(list);
-    PyObject_ReleaseBuffer(subobj, &vsub);
-    return NULL;
+string_startswith(PyBytesObject *self, PyObject *args)
+{
+	Py_ssize_t start = 0;
+	Py_ssize_t end = PY_SSIZE_T_MAX;
+	PyObject *subobj;
+	int result;
+
+	if (!PyArg_ParseTuple(args, "O|O&O&:startswith", &subobj,
+		_PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+		return NULL;
+	if (PyTuple_Check(subobj)) {
+		Py_ssize_t i;
+		for (i = 0; i < PyTuple_GET_SIZE(subobj); i++) {
+			result = _string_tailmatch(self,
+					PyTuple_GET_ITEM(subobj, i),
+					start, end, -1);
+			if (result == -1)
+				return NULL;
+			else if (result) {
+				Py_RETURN_TRUE;
+			}
+		}
+		Py_RETURN_FALSE;
+	}
+	result = _string_tailmatch(self, subobj, start, end, -1);
+	if (result == -1)
+		return NULL;
+	else
+		return PyBool_FromLong(result);
 }
 
-/* stringlib's partition shares nullbytes in some cases.
-   undo this, we don't want the nullbytes to be shared. */
-static PyObject *
-make_nullbytes_unique(PyObject *result)
-{
-    if (result != NULL) {
-        int i;
-        assert(PyTuple_Check(result));
-        assert(PyTuple_GET_SIZE(result) == 3);
-        for (i = 0; i < 3; i++) {
-            if (PyTuple_GET_ITEM(result, i) == (PyObject *)nullbytes) {
-                PyObject *new = PyByteArray_FromStringAndSize(NULL, 0);
-                if (new == NULL) {
-                    Py_DECREF(result);
-                    result = NULL;
-                    break;
-                }
-                Py_DECREF(nullbytes);
-                PyTuple_SET_ITEM(result, i, new);
-            }
-        }
-    }
-    return result;
-}
 
-PyDoc_STRVAR(partition__doc__,
-"B.partition(sep) -> (head, sep, tail)\n\
+PyDoc_STRVAR(endswith__doc__,
+"B.endswith(suffix [,start [,end]]) -> bool\n\
 \n\
-Searches for the separator sep in B, and returns the part before it,\n\
-the separator itself, and the part after it.  If the separator is not\n\
-found, returns B and two empty bytearray objects.");
+Return True if B ends with the specified suffix, False otherwise.\n\
+With optional start, test B beginning at that position.\n\
+With optional end, stop comparing B at that position.\n\
+suffix can also be a tuple of strings to try.");
 
 static PyObject *
-bytes_partition(PyByteArrayObject *self, PyObject *sep_obj)
-{
-    PyObject *bytesep, *result;
-
-    bytesep = PyByteArray_FromObject(sep_obj);
-    if (! bytesep)
-        return NULL;
-
-    result = stringlib_partition(
-            (PyObject*) self,
-            PyByteArray_AS_STRING(self), PyByteArray_GET_SIZE(self),
-            bytesep,
-            PyByteArray_AS_STRING(bytesep), PyByteArray_GET_SIZE(bytesep)
-            );
-
-    Py_DECREF(bytesep);
-    return make_nullbytes_unique(result);
+string_endswith(PyBytesObject *self, PyObject *args)
+{
+	Py_ssize_t start = 0;
+	Py_ssize_t end = PY_SSIZE_T_MAX;
+	PyObject *subobj;
+	int result;
+
+	if (!PyArg_ParseTuple(args, "O|O&O&:endswith", &subobj,
+		_PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+		return NULL;
+	if (PyTuple_Check(subobj)) {
+		Py_ssize_t i;
+		for (i = 0; i < PyTuple_GET_SIZE(subobj); i++) {
+			result = _string_tailmatch(self,
+					PyTuple_GET_ITEM(subobj, i),
+					start, end, +1);
+			if (result == -1)
+				return NULL;
+			else if (result) {
+				Py_RETURN_TRUE;
+			}
+		}
+		Py_RETURN_FALSE;
+	}
+	result = _string_tailmatch(self, subobj, start, end, +1);
+	if (result == -1)
+		return NULL;
+	else
+		return PyBool_FromLong(result);
 }
 
-PyDoc_STRVAR(rpartition__doc__,
-"B.rpartition(sep) -> (tail, sep, head)\n\
+
+PyDoc_STRVAR(decode__doc__,
+"B.decode([encoding[, errors]]) -> object\n\
 \n\
-Searches for the separator sep in B, starting at the end of B,\n\
-and returns the part before it, the separator itself, and the\n\
-part after it.  If the separator is not found, returns two empty\n\
-bytearray objects and B.");
+Decodes S using the codec registered for encoding. encoding defaults\n\
+to the default encoding. errors may be given to set a different error\n\
+handling scheme.  Default is 'strict' meaning that encoding errors raise\n\
+a UnicodeDecodeError.  Other possible values are 'ignore' and 'replace'\n\
+as well as any other name registerd with codecs.register_error that is\n\
+able to handle UnicodeDecodeErrors.");
 
 static PyObject *
-bytes_rpartition(PyByteArrayObject *self, PyObject *sep_obj)
+string_decode(PyObject *self, PyObject *args)
 {
-    PyObject *bytesep, *result;
-
-    bytesep = PyByteArray_FromObject(sep_obj);
-    if (! bytesep)
-        return NULL;
-
-    result = stringlib_rpartition(
-            (PyObject*) self,
-            PyByteArray_AS_STRING(self), PyByteArray_GET_SIZE(self),
-            bytesep,
-            PyByteArray_AS_STRING(bytesep), PyByteArray_GET_SIZE(bytesep)
-            );
-
-    Py_DECREF(bytesep);
-    return make_nullbytes_unique(result);
-}
+	const char *encoding = NULL;
+	const char *errors = NULL;
 
-Py_LOCAL_INLINE(PyObject *)
-rsplit_char(const char *s, Py_ssize_t len, char ch, Py_ssize_t maxcount)
-{
-    register Py_ssize_t i, j, count=0;
-    PyObject *str;
-    PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
-
-    if (list == NULL)
-        return NULL;
-
-    i = j = len - 1;
-    while ((i >= 0) && (maxcount-- > 0)) {
-        for (; i >= 0; i--) {
-            if (s[i] == ch) {
-                SPLIT_ADD(s, i + 1, j + 1);
-                j = i = i - 1;
-                break;
-            }
-        }
-    }
-    if (j >= -1) {
-        SPLIT_ADD(s, 0, j + 1);
-    }
-    FIX_PREALLOC_SIZE(list);
-    if (PyList_Reverse(list) < 0)
-        goto onError;
-
-    return list;
-
-  onError:
-    Py_DECREF(list);
-    return NULL;
+	if (!PyArg_ParseTuple(args, "|ss:decode", &encoding, &errors))
+		return NULL;
+	if (encoding == NULL)
+		encoding = PyUnicode_GetDefaultEncoding();
+	return PyCodec_Decode(self, encoding, errors);
 }
 
-Py_LOCAL_INLINE(PyObject *)
-rsplit_whitespace(const char *s, Py_ssize_t len, Py_ssize_t maxcount)
-{
-    register Py_ssize_t i, j, count = 0;
-    PyObject *str;
-    PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
-
-    if (list == NULL)
-        return NULL;
-
-    for (i = j = len - 1; i >= 0; ) {
-        /* find a token */
-        while (i >= 0 && ISSPACE(s[i]))
-            i--;
-        j = i;
-        while (i >= 0 && !ISSPACE(s[i]))
-            i--;
-        if (j > i) {
-            if (maxcount-- <= 0)
-                break;
-            SPLIT_ADD(s, i + 1, j + 1);
-            while (i >= 0 && ISSPACE(s[i]))
-                i--;
-            j = i;
-        }
-    }
-    if (j >= 0) {
-        SPLIT_ADD(s, 0, j + 1);
-    }
-    FIX_PREALLOC_SIZE(list);
-    if (PyList_Reverse(list) < 0)
-        goto onError;
-
-    return list;
-
-  onError:
-    Py_DECREF(list);
-    return NULL;
-}
 
-PyDoc_STRVAR(rsplit__doc__,
-"B.rsplit(sep[, maxsplit]) -> list of bytearray\n\
+PyDoc_STRVAR(fromhex_doc,
+"bytes.fromhex(string) -> bytes\n\
 \n\
-Return a list of the sections in B, using sep as the delimiter,\n\
-starting at the end of B and working to the front.\n\
-If sep is not given, B is split on ASCII whitespace characters\n\
-(space, tab, return, newline, formfeed, vertical tab).\n\
-If maxsplit is given, at most maxsplit splits are done.");
-
-static PyObject *
-bytes_rsplit(PyByteArrayObject *self, PyObject *args)
-{
-    Py_ssize_t len = PyByteArray_GET_SIZE(self), n, i, j;
-    Py_ssize_t maxsplit = -1, count = 0;
-    const char *s = PyByteArray_AS_STRING(self), *sub;
-    PyObject *list, *str, *subobj = Py_None;
-    Py_buffer vsub;
-
-    if (!PyArg_ParseTuple(args, "|On:rsplit", &subobj, &maxsplit))
-        return NULL;
-    if (maxsplit < 0)
-        maxsplit = PY_SSIZE_T_MAX;
-
-    if (subobj == Py_None)
-        return rsplit_whitespace(s, len, maxsplit);
-
-    if (_getbuffer(subobj, &vsub) < 0)
-        return NULL;
-    sub = vsub.buf;
-    n = vsub.len;
-
-    if (n == 0) {
-        PyErr_SetString(PyExc_ValueError, "empty separator");
-        PyObject_ReleaseBuffer(subobj, &vsub);
-        return NULL;
-    }
-    else if (n == 1)
-        return rsplit_char(s, len, sub[0], maxsplit);
-
-    list = PyList_New(PREALLOC_SIZE(maxsplit));
-    if (list == NULL) {
-        PyObject_ReleaseBuffer(subobj, &vsub);
-        return NULL;
-    }
-
-    j = len;
-    i = j - n;
-
-    while ( (i >= 0) && (maxsplit-- > 0) ) {
-        for (; i>=0; i--) {
-            if (Py_STRING_MATCH(s, i, sub, n)) {
-                SPLIT_ADD(s, i + n, j);
-                j = i;
-                i -= n;
-                break;
-            }
-        }
-    }
-    SPLIT_ADD(s, 0, j);
-    FIX_PREALLOC_SIZE(list);
-    if (PyList_Reverse(list) < 0)
-        goto onError;
-    PyObject_ReleaseBuffer(subobj, &vsub);
-    return list;
+Create a bytes object from a string of hexadecimal numbers.\n\
+Spaces between two numbers are accepted.\n\
+Example: bytes.fromhex('B9 01EF') -> b'\\xb9\\x01\\xef'.");
 
-onError:
-    Py_DECREF(list);
-    PyObject_ReleaseBuffer(subobj, &vsub);
-    return NULL;
+static int
+hex_digit_to_int(Py_UNICODE c)
+{
+	if (c >= 128)
+		return -1;
+	if (ISDIGIT(c))
+		return c - '0';
+	else {
+		if (ISUPPER(c))
+			c = TOLOWER(c);
+		if (c >= 'a' && c <= 'f')
+			return c - 'a' + 10;
+	}
+	return -1;
 }
 
-PyDoc_STRVAR(reverse__doc__,
-"B.reverse() -> None\n\
-\n\
-Reverse the order of the values in B in place.");
 static PyObject *
-bytes_reverse(PyByteArrayObject *self, PyObject *unused)
-{
-    char swap, *head, *tail;
-    Py_ssize_t i, j, n = Py_SIZE(self);
-
-    j = n / 2;
-    head = self->ob_bytes;
-    tail = head + n - 1;
-    for (i = 0; i < j; i++) {
-        swap = *head;
-        *head++ = *tail;
-        *tail-- = swap;
-    }
+string_fromhex(PyObject *cls, PyObject *args)
+{
+	PyObject *newstring, *hexobj;
+	char *buf;
+	Py_UNICODE *hex;
+	Py_ssize_t hexlen, byteslen, i, j;
+	int top, bot;
+
+	if (!PyArg_ParseTuple(args, "U:fromhex", &hexobj))
+		return NULL;
+	assert(PyUnicode_Check(hexobj));
+	hexlen = PyUnicode_GET_SIZE(hexobj);
+	hex = PyUnicode_AS_UNICODE(hexobj);
+	byteslen = hexlen/2; /* This overestimates if there are spaces */
+	newstring = PyBytes_FromStringAndSize(NULL, byteslen);
+	if (!newstring)
+		return NULL;
+	buf = PyBytes_AS_STRING(newstring);
+	for (i = j = 0; i < hexlen; i += 2) {
+		/* skip over spaces in the input */
+		while (hex[i] == ' ')
+			i++;
+		if (i >= hexlen)
+			break;
+		top = hex_digit_to_int(hex[i]);
+		bot = hex_digit_to_int(hex[i+1]);
+		if (top == -1 || bot == -1) {
+			PyErr_Format(PyExc_ValueError,
+				     "non-hexadecimal number found in "
+				     "fromhex() arg at position %zd", i);
+			goto error;
+		}
+		buf[j++] = (top << 4) + bot;
+	}
+	if (j != byteslen && _PyBytes_Resize(&newstring, j) < 0)
+		goto error;
+	return newstring;
 
-    Py_RETURN_NONE;
+  error:
+	Py_XDECREF(newstring);
+	return NULL;
 }
 
-PyDoc_STRVAR(insert__doc__,
-"B.insert(index, int) -> None\n\
-\n\
-Insert a single item into the bytearray before the given index.");
-static PyObject *
-bytes_insert(PyByteArrayObject *self, PyObject *args)
-{
-    int value;
-    Py_ssize_t where, n = Py_SIZE(self);
-
-    if (!PyArg_ParseTuple(args, "ni:insert", &where, &value))
-        return NULL;
 
-    if (n == PY_SSIZE_T_MAX) {
-        PyErr_SetString(PyExc_OverflowError,
-                        "cannot add more objects to bytes");
-        return NULL;
-    }
-    if (value < 0 || value >= 256) {
-        PyErr_SetString(PyExc_ValueError,
-                        "byte must be in range(0, 256)");
-        return NULL;
-    }
-    if (PyByteArray_Resize((PyObject *)self, n + 1) < 0)
-        return NULL;
-
-    if (where < 0) {
-        where += n;
-        if (where < 0)
-            where = 0;
-    }
-    if (where > n)
-        where = n;
-    memmove(self->ob_bytes + where + 1, self->ob_bytes + where, n - where);
-    self->ob_bytes[where] = value;
-
-    Py_RETURN_NONE;
-}
-
-PyDoc_STRVAR(append__doc__,
-"B.append(int) -> None\n\
-\n\
-Append a single item to the end of B.");
 static PyObject *
-bytes_append(PyByteArrayObject *self, PyObject *arg)
+string_getnewargs(PyBytesObject *v)
 {
-    int value;
-    Py_ssize_t n = Py_SIZE(self);
-
-    if (! _getbytevalue(arg, &value))
-        return NULL;
-    if (n == PY_SSIZE_T_MAX) {
-        PyErr_SetString(PyExc_OverflowError,
-                        "cannot add more objects to bytes");
-        return NULL;
-    }
-    if (PyByteArray_Resize((PyObject *)self, n + 1) < 0)
-        return NULL;
-
-    self->ob_bytes[n] = value;
-
-    Py_RETURN_NONE;
+	return Py_BuildValue("(s#)", v->ob_sval, Py_SIZE(v));
 }
 
-PyDoc_STRVAR(extend__doc__,
-"B.extend(iterable int) -> None\n\
-\n\
-Append all the elements from the iterator or sequence to the\n\
-end of B.");
-static PyObject *
-bytes_extend(PyByteArrayObject *self, PyObject *arg)
-{
-    PyObject *it, *item, *bytes_obj;
-    Py_ssize_t buf_size = 0, len = 0;
-    int value;
-    char *buf;
-
-    /* bytes_setslice code only accepts something supporting PEP 3118. */
-    if (PyObject_CheckBuffer(arg)) {
-        if (bytes_setslice(self, Py_SIZE(self), Py_SIZE(self), arg) == -1)
-            return NULL;
 
-        Py_RETURN_NONE;
-    }
-
-    it = PyObject_GetIter(arg);
-    if (it == NULL)
-        return NULL;
-
-    /* Try to determine the length of the argument. 32 is abitrary. */
-    buf_size = _PyObject_LengthHint(arg, 32);
-
-    bytes_obj = PyByteArray_FromStringAndSize(NULL, buf_size);
-    if (bytes_obj == NULL)
-        return NULL;
-    buf = PyByteArray_AS_STRING(bytes_obj);
-
-    while ((item = PyIter_Next(it)) != NULL) {
-        if (! _getbytevalue(item, &value)) {
-            Py_DECREF(item);
-            Py_DECREF(it);
-            Py_DECREF(bytes_obj);
-            return NULL;
-        }
-        buf[len++] = value;
-        Py_DECREF(item);
-
-        if (len >= buf_size) {
-            buf_size = len + (len >> 1) + 1;
-            if (PyByteArray_Resize((PyObject *)bytes_obj, buf_size) < 0) {
-                Py_DECREF(it);
-                Py_DECREF(bytes_obj);
-                return NULL;
-            }
-            /* Recompute the `buf' pointer, since the resizing operation may
-               have invalidated it. */
-            buf = PyByteArray_AS_STRING(bytes_obj);
-        }
-    }
-    Py_DECREF(it);
-
-    /* Resize down to exact size. */
-    if (PyByteArray_Resize((PyObject *)bytes_obj, len) < 0) {
-        Py_DECREF(bytes_obj);
-        return NULL;
-    }
-
-    if (bytes_setslice(self, Py_SIZE(self), Py_SIZE(self), bytes_obj) == -1)
-        return NULL;
-    Py_DECREF(bytes_obj);
-
-    Py_RETURN_NONE;
-}
+static PyMethodDef
+string_methods[] = {
+	{"__getnewargs__",	(PyCFunction)string_getnewargs,	METH_NOARGS},
+	{"capitalize", (PyCFunction)stringlib_capitalize, METH_NOARGS,
+	 _Py_capitalize__doc__},
+	{"center", (PyCFunction)stringlib_center, METH_VARARGS, center__doc__},
+	{"count", (PyCFunction)string_count, METH_VARARGS, count__doc__},
+	{"decode", (PyCFunction)string_decode, METH_VARARGS, decode__doc__},
+	{"endswith", (PyCFunction)string_endswith, METH_VARARGS,
+         endswith__doc__},
+	{"expandtabs", (PyCFunction)stringlib_expandtabs, METH_VARARGS,
+	 expandtabs__doc__},
+	{"find", (PyCFunction)string_find, METH_VARARGS, find__doc__},
+        {"fromhex", (PyCFunction)string_fromhex, METH_VARARGS|METH_CLASS,
+         fromhex_doc},
+	{"index", (PyCFunction)string_index, METH_VARARGS, index__doc__},
+	{"isalnum", (PyCFunction)stringlib_isalnum, METH_NOARGS,
+         _Py_isalnum__doc__},
+	{"isalpha", (PyCFunction)stringlib_isalpha, METH_NOARGS,
+         _Py_isalpha__doc__},
+	{"isdigit", (PyCFunction)stringlib_isdigit, METH_NOARGS,
+         _Py_isdigit__doc__},
+	{"islower", (PyCFunction)stringlib_islower, METH_NOARGS,
+         _Py_islower__doc__},
+	{"isspace", (PyCFunction)stringlib_isspace, METH_NOARGS,
+         _Py_isspace__doc__},
+	{"istitle", (PyCFunction)stringlib_istitle, METH_NOARGS,
+         _Py_istitle__doc__},
+	{"isupper", (PyCFunction)stringlib_isupper, METH_NOARGS,
+         _Py_isupper__doc__},
+	{"join", (PyCFunction)string_join, METH_O, join__doc__},
+	{"ljust", (PyCFunction)stringlib_ljust, METH_VARARGS, ljust__doc__},
+	{"lower", (PyCFunction)stringlib_lower, METH_NOARGS, _Py_lower__doc__},
+	{"lstrip", (PyCFunction)string_lstrip, METH_VARARGS, lstrip__doc__},
+	{"partition", (PyCFunction)string_partition, METH_O, partition__doc__},
+	{"replace", (PyCFunction)string_replace, METH_VARARGS, replace__doc__},
+	{"rfind", (PyCFunction)string_rfind, METH_VARARGS, rfind__doc__},
+	{"rindex", (PyCFunction)string_rindex, METH_VARARGS, rindex__doc__},
+	{"rjust", (PyCFunction)stringlib_rjust, METH_VARARGS, rjust__doc__},
+	{"rpartition", (PyCFunction)string_rpartition, METH_O,
+	 rpartition__doc__},
+	{"rsplit", (PyCFunction)string_rsplit, METH_VARARGS, rsplit__doc__},
+	{"rstrip", (PyCFunction)string_rstrip, METH_VARARGS, rstrip__doc__},
+	{"split", (PyCFunction)string_split, METH_VARARGS, split__doc__},
+	{"splitlines", (PyCFunction)stringlib_splitlines, METH_VARARGS,
+	 splitlines__doc__},
+	{"startswith", (PyCFunction)string_startswith, METH_VARARGS,
+         startswith__doc__},
+	{"strip", (PyCFunction)string_strip, METH_VARARGS, strip__doc__},
+	{"swapcase", (PyCFunction)stringlib_swapcase, METH_NOARGS,
+	 _Py_swapcase__doc__},
+	{"title", (PyCFunction)stringlib_title, METH_NOARGS, _Py_title__doc__},
+	{"translate", (PyCFunction)string_translate, METH_VARARGS,
+	 translate__doc__},
+	{"upper", (PyCFunction)stringlib_upper, METH_NOARGS, _Py_upper__doc__},
+	{"zfill", (PyCFunction)stringlib_zfill, METH_VARARGS, zfill__doc__},
+	{NULL,     NULL}		     /* sentinel */
+};
 
-PyDoc_STRVAR(pop__doc__,
-"B.pop([index]) -> int\n\
-\n\
-Remove and return a single item from B. If no index\n\
-argument is give, will pop the last value.");
 static PyObject *
-bytes_pop(PyByteArrayObject *self, PyObject *args)
-{
-    int value;
-    Py_ssize_t where = -1, n = Py_SIZE(self);
-
-    if (!PyArg_ParseTuple(args, "|n:pop", &where))
-        return NULL;
-
-    if (n == 0) {
-        PyErr_SetString(PyExc_OverflowError,
-                        "cannot pop an empty bytes");
-        return NULL;
-    }
-    if (where < 0)
-        where += Py_SIZE(self);
-    if (where < 0 || where >= Py_SIZE(self)) {
-        PyErr_SetString(PyExc_IndexError, "pop index out of range");
-        return NULL;
-    }
+str_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
 
-    value = self->ob_bytes[where];
-    memmove(self->ob_bytes + where, self->ob_bytes + where + 1, n - where);
-    if (PyByteArray_Resize((PyObject *)self, n - 1) < 0)
-        return NULL;
-
-    return PyLong_FromLong(value);
-}
-
-PyDoc_STRVAR(remove__doc__,
-"B.remove(int) -> None\n\
-\n\
-Remove the first occurance of a value in B.");
 static PyObject *
-bytes_remove(PyByteArrayObject *self, PyObject *arg)
-{
-    int value;
-    Py_ssize_t where, n = Py_SIZE(self);
-
-    if (! _getbytevalue(arg, &value))
-        return NULL;
-
-    for (where = 0; where < n; where++) {
-        if (self->ob_bytes[where] == value)
-            break;
-    }
-    if (where == n) {
-        PyErr_SetString(PyExc_ValueError, "value not found in bytes");
-        return NULL;
-    }
+string_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+	PyObject *x = NULL, *it;
+	const char *encoding = NULL;
+	const char *errors = NULL;
+	PyObject *new = NULL;
+	Py_ssize_t i, size;
+	static char *kwlist[] = {"source", "encoding", "errors", 0};
+
+	if (type != &PyBytes_Type)
+		return str_subtype_new(type, args, kwds);
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "|Oss:bytes", kwlist, &x,
+					 &encoding, &errors))
+		return NULL;
+	if (x == NULL) {
+		if (encoding != NULL || errors != NULL) {
+			PyErr_SetString(PyExc_TypeError,
+					"encoding or errors without sequence "
+					"argument");
+			return NULL;
+		}
+		return PyBytes_FromString("");
+	}
 
-    memmove(self->ob_bytes + where, self->ob_bytes + where + 1, n - where);
-    if (PyByteArray_Resize((PyObject *)self, n - 1) < 0)
-        return NULL;
+	if (PyUnicode_Check(x)) {
+		/* Encode via the codec registry */
+		if (encoding == NULL) {
+			PyErr_SetString(PyExc_TypeError,
+					"string argument without an encoding");
+			return NULL;
+		}
+		new = PyCodec_Encode(x, encoding, errors);
+		if (new == NULL)
+			return NULL;
+		assert(PyBytes_Check(new));
+		return new;
+	}
 
-    Py_RETURN_NONE;
-}
+	/* If it's not unicode, there can't be encoding or errors */
+	if (encoding != NULL || errors != NULL) {
+		PyErr_SetString(PyExc_TypeError,
+			"encoding or errors without a string argument");
+		return NULL;
+	}
 
-/* XXX These two helpers could be optimized if argsize == 1 */
+	/* Is it an int? */
+	size = PyNumber_AsSsize_t(x, PyExc_ValueError);
+	if (size == -1 && PyErr_Occurred()) {
+		PyErr_Clear();
+	}
+	else {
+		if (size < 0) {
+			PyErr_SetString(PyExc_ValueError, "negative count");
+			return NULL;
+		}
+		new = PyBytes_FromStringAndSize(NULL, size);
+		if (new == NULL) {
+			return NULL;
+		}
+		if (size > 0) {
+			memset(((PyBytesObject*)new)->ob_sval, 0, size);
+		}
+		return new;
+	}
 
-static Py_ssize_t
-lstrip_helper(unsigned char *myptr, Py_ssize_t mysize,
-              void *argptr, Py_ssize_t argsize)
-{
-    Py_ssize_t i = 0;
-    while (i < mysize && memchr(argptr, myptr[i], argsize))
-        i++;
-    return i;
-}
+	/* Use the modern buffer interface */
+	if (PyObject_CheckBuffer(x)) {
+		Py_buffer view;
+		if (PyObject_GetBuffer(x, &view, PyBUF_FULL_RO) < 0)
+			return NULL;
+		new = PyBytes_FromStringAndSize(NULL, view.len);
+		if (!new)
+			goto fail;
+		// XXX(brett.cannon): Better way to get to internal buffer?
+		if (PyBuffer_ToContiguous(((PyBytesObject *)new)->ob_sval,
+					  &view, view.len, 'C') < 0)
+			goto fail;
+		PyObject_ReleaseBuffer(x, &view);
+		return new;
+	  fail:
+		Py_XDECREF(new);
+		PyObject_ReleaseBuffer(x, &view);
+		return NULL;
+	}
 
-static Py_ssize_t
-rstrip_helper(unsigned char *myptr, Py_ssize_t mysize,
-              void *argptr, Py_ssize_t argsize)
-{
-    Py_ssize_t i = mysize - 1;
-    while (i >= 0 && memchr(argptr, myptr[i], argsize))
-        i--;
-    return i + 1;
-}
+	/* For iterator version, create a string object and resize as needed */
+	/* XXX(gb): is 64 a good value? also, optimize if length is known */
+	/* XXX(guido): perhaps use Pysequence_Fast() -- I can't imagine the
+	   input being a truly long iterator. */
+	size = 64;
+	new = PyBytes_FromStringAndSize(NULL, size);
+	if (new == NULL)
+		return NULL;
+
+	/* XXX Optimize this if the arguments is a list, tuple */
+
+	/* Get the iterator */
+	it = PyObject_GetIter(x);
+	if (it == NULL)
+		goto error;
+
+	/* Run the iterator to exhaustion */
+	for (i = 0; ; i++) {
+		PyObject *item;
+		Py_ssize_t value;
+
+		/* Get the next item */
+		item = PyIter_Next(it);
+		if (item == NULL) {
+			if (PyErr_Occurred())
+				goto error;
+			break;
+		}
+
+		/* Interpret it as an int (__index__) */
+		value = PyNumber_AsSsize_t(item, PyExc_ValueError);
+		Py_DECREF(item);
+		if (value == -1 && PyErr_Occurred())
+			goto error;
+
+		/* Range check */
+		if (value < 0 || value >= 256) {
+			PyErr_SetString(PyExc_ValueError,
+					"bytes must be in range(0, 256)");
+			goto error;
+		}
+
+		/* Append the byte */
+		if (i >= size) {
+			size *= 2;
+			if (_PyBytes_Resize(&new, size) < 0)
+				goto error;
+		}
+		((PyBytesObject *)new)->ob_sval[i] = value;
+	}
+	_PyBytes_Resize(&new, i);
 
-PyDoc_STRVAR(strip__doc__,
-"B.strip([bytes]) -> bytearray\n\
-\n\
-Strip leading and trailing bytes contained in the argument.\n\
-If the argument is omitted, strip ASCII whitespace.");
-static PyObject *
-bytes_strip(PyByteArrayObject *self, PyObject *args)
-{
-    Py_ssize_t left, right, mysize, argsize;
-    void *myptr, *argptr;
-    PyObject *arg = Py_None;
-    Py_buffer varg;
-    if (!PyArg_ParseTuple(args, "|O:strip", &arg))
-        return NULL;
-    if (arg == Py_None) {
-        argptr = "\t\n\r\f\v ";
-        argsize = 6;
-    }
-    else {
-        if (_getbuffer(arg, &varg) < 0)
-            return NULL;
-        argptr = varg.buf;
-        argsize = varg.len;
-    }
-    myptr = self->ob_bytes;
-    mysize = Py_SIZE(self);
-    left = lstrip_helper(myptr, mysize, argptr, argsize);
-    if (left == mysize)
-        right = left;
-    else
-        right = rstrip_helper(myptr, mysize, argptr, argsize);
-    if (arg != Py_None)
-        PyObject_ReleaseBuffer(arg, &varg);
-    return PyByteArray_FromStringAndSize(self->ob_bytes + left, right - left);
-}
+	/* Clean up and return success */
+	Py_DECREF(it);
+	return new;
 
-PyDoc_STRVAR(lstrip__doc__,
-"B.lstrip([bytes]) -> bytearray\n\
-\n\
-Strip leading bytes contained in the argument.\n\
-If the argument is omitted, strip leading ASCII whitespace.");
-static PyObject *
-bytes_lstrip(PyByteArrayObject *self, PyObject *args)
-{
-    Py_ssize_t left, right, mysize, argsize;
-    void *myptr, *argptr;
-    PyObject *arg = Py_None;
-    Py_buffer varg;
-    if (!PyArg_ParseTuple(args, "|O:lstrip", &arg))
-        return NULL;
-    if (arg == Py_None) {
-        argptr = "\t\n\r\f\v ";
-        argsize = 6;
-    }
-    else {
-        if (_getbuffer(arg, &varg) < 0)
-            return NULL;
-        argptr = varg.buf;
-        argsize = varg.len;
-    }
-    myptr = self->ob_bytes;
-    mysize = Py_SIZE(self);
-    left = lstrip_helper(myptr, mysize, argptr, argsize);
-    right = mysize;
-    if (arg != Py_None)
-        PyObject_ReleaseBuffer(arg, &varg);
-    return PyByteArray_FromStringAndSize(self->ob_bytes + left, right - left);
+  error:
+	/* Error handling when new != NULL */
+	Py_XDECREF(it);
+	Py_DECREF(new);
+	return NULL;
 }
 
-PyDoc_STRVAR(rstrip__doc__,
-"B.rstrip([bytes]) -> bytearray\n\
-\n\
-Strip trailing bytes contained in the argument.\n\
-If the argument is omitted, strip trailing ASCII whitespace.");
 static PyObject *
-bytes_rstrip(PyByteArrayObject *self, PyObject *args)
-{
-    Py_ssize_t left, right, mysize, argsize;
-    void *myptr, *argptr;
-    PyObject *arg = Py_None;
-    Py_buffer varg;
-    if (!PyArg_ParseTuple(args, "|O:rstrip", &arg))
-        return NULL;
-    if (arg == Py_None) {
-        argptr = "\t\n\r\f\v ";
-        argsize = 6;
-    }
-    else {
-        if (_getbuffer(arg, &varg) < 0)
-            return NULL;
-        argptr = varg.buf;
-        argsize = varg.len;
-    }
-    myptr = self->ob_bytes;
-    mysize = Py_SIZE(self);
-    left = 0;
-    right = rstrip_helper(myptr, mysize, argptr, argsize);
-    if (arg != Py_None)
-        PyObject_ReleaseBuffer(arg, &varg);
-    return PyByteArray_FromStringAndSize(self->ob_bytes + left, right - left);
+str_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+	PyObject *tmp, *pnew;
+	Py_ssize_t n;
+
+	assert(PyType_IsSubtype(type, &PyBytes_Type));
+	tmp = string_new(&PyBytes_Type, args, kwds);
+	if (tmp == NULL)
+		return NULL;
+	assert(PyBytes_CheckExact(tmp));
+	n = PyBytes_GET_SIZE(tmp);
+	pnew = type->tp_alloc(type, n);
+	if (pnew != NULL) {
+		Py_MEMCPY(PyBytes_AS_STRING(pnew),
+			  PyBytes_AS_STRING(tmp), n+1);
+		((PyBytesObject *)pnew)->ob_shash =
+			((PyBytesObject *)tmp)->ob_shash;
+	}
+	Py_DECREF(tmp);
+	return pnew;
 }
 
-PyDoc_STRVAR(decode_doc,
-"B.decode([encoding[, errors]]) -> unicode object.\n\
+PyDoc_STRVAR(string_doc,
+"bytes(iterable_of_ints) -> bytes.\n\
+bytes(string, encoding[, errors]) -> bytes\n\
+bytes(bytes_or_buffer) -> immutable copy of bytes_or_buffer.\n\
+bytes(memory_view) -> bytes.\n\
 \n\
-Decodes B using the codec registered for encoding. encoding defaults\n\
-to the default encoding. errors may be given to set a different error\n\
-handling scheme.  Default is 'strict' meaning that encoding errors raise\n\
-a UnicodeDecodeError.  Other possible values are 'ignore' and 'replace'\n\
-as well as any other name registered with codecs.register_error that is\n\
-able to handle UnicodeDecodeErrors.");
-
-static PyObject *
-bytes_decode(PyObject *self, PyObject *args)
-{
-    const char *encoding = NULL;
-    const char *errors = NULL;
+Construct an immutable array of bytes from:\n\
+  - an iterable yielding integers in range(256)\n\
+  - a text string encoded using the specified encoding\n\
+  - a bytes or a buffer object\n\
+  - any object implementing the buffer API.");
+
+static PyObject *str_iter(PyObject *seq);
+
+PyTypeObject PyBytes_Type = {
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
+	"bytes",
+	sizeof(PyBytesObject),
+	sizeof(char),
+ 	string_dealloc, 			/* tp_dealloc */
+	0,			 		/* tp_print */
+	0,					/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_compare */
+	(reprfunc)string_repr, 			/* tp_repr */
+	0,					/* tp_as_number */
+	&string_as_sequence,			/* tp_as_sequence */
+	&string_as_mapping,			/* tp_as_mapping */
+	(hashfunc)string_hash, 			/* tp_hash */
+	0,					/* tp_call */
+	string_str,				/* tp_str */
+	PyObject_GenericGetAttr,		/* tp_getattro */
+	0,					/* tp_setattro */
+	&string_as_buffer,			/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
+		Py_TPFLAGS_BYTES_SUBCLASS,	/* tp_flags */
+	string_doc,				/* tp_doc */
+	0,					/* tp_traverse */
+	0,					/* tp_clear */
+	(richcmpfunc)string_richcompare,	/* tp_richcompare */
+	0,					/* tp_weaklistoffset */
+	str_iter,				/* tp_iter */
+	0,					/* tp_iternext */
+	string_methods,				/* tp_methods */
+	0,					/* tp_members */
+	0,					/* tp_getset */
+	&PyBaseObject_Type,			/* tp_base */
+	0,					/* tp_dict */
+	0,					/* tp_descr_get */
+	0,					/* tp_descr_set */
+	0,					/* tp_dictoffset */
+	0,					/* tp_init */
+	0,					/* tp_alloc */
+	string_new,				/* tp_new */
+	PyObject_Del,	                	/* tp_free */
+};
 
-    if (!PyArg_ParseTuple(args, "|ss:decode", &encoding, &errors))
-        return NULL;
-    if (encoding == NULL)
-        encoding = PyUnicode_GetDefaultEncoding();
-    return PyCodec_Decode(self, encoding, errors);
+void
+PyBytes_Concat(register PyObject **pv, register PyObject *w)
+{
+	register PyObject *v;
+	assert(pv != NULL);
+	if (*pv == NULL)
+		return;
+	if (w == NULL) {
+		Py_DECREF(*pv);
+		*pv = NULL;
+		return;
+	}
+	v = string_concat(*pv, w);
+	Py_DECREF(*pv);
+	*pv = v;
 }
 
-PyDoc_STRVAR(alloc_doc,
-"B.__alloc__() -> int\n\
-\n\
-Returns the number of bytes actually allocated.");
-
-static PyObject *
-bytes_alloc(PyByteArrayObject *self)
+void
+PyBytes_ConcatAndDel(register PyObject **pv, register PyObject *w)
 {
-    return PyLong_FromSsize_t(self->ob_alloc);
+	PyBytes_Concat(pv, w);
+	Py_XDECREF(w);
 }
 
-PyDoc_STRVAR(join_doc,
-"B.join(iterable_of_bytes) -> bytes\n\
-\n\
-Concatenates any number of bytearray objects, with B in between each pair.");
 
-static PyObject *
-bytes_join(PyByteArrayObject *self, PyObject *it)
-{
-    PyObject *seq;
-    Py_ssize_t mysize = Py_SIZE(self);
-    Py_ssize_t i;
-    Py_ssize_t n;
-    PyObject **items;
-    Py_ssize_t totalsize = 0;
-    PyObject *result;
-    char *dest;
-
-    seq = PySequence_Fast(it, "can only join an iterable");
-    if (seq == NULL)
-        return NULL;
-    n = PySequence_Fast_GET_SIZE(seq);
-    items = PySequence_Fast_ITEMS(seq);
-
-    /* Compute the total size, and check that they are all bytes */
-    /* XXX Shouldn't we use _getbuffer() on these items instead? */
-    for (i = 0; i < n; i++) {
-        PyObject *obj = items[i];
-        if (!PyByteArray_Check(obj) && !PyBytes_Check(obj)) {
-            PyErr_Format(PyExc_TypeError,
-                         "can only join an iterable of bytes "
-                         "(item %ld has type '%.100s')",
-                         /* XXX %ld isn't right on Win64 */
-                         (long)i, Py_TYPE(obj)->tp_name);
-            goto error;
-        }
-        if (i > 0)
-            totalsize += mysize;
-        totalsize += Py_SIZE(obj);
-        if (totalsize < 0) {
-            PyErr_NoMemory();
-            goto error;
-        }
-    }
-
-    /* Allocate the result, and copy the bytes */
-    result = PyByteArray_FromStringAndSize(NULL, totalsize);
-    if (result == NULL)
-        goto error;
-    dest = PyByteArray_AS_STRING(result);
-    for (i = 0; i < n; i++) {
-        PyObject *obj = items[i];
-        Py_ssize_t size = Py_SIZE(obj);
-        char *buf;
-        if (PyByteArray_Check(obj))
-           buf = PyByteArray_AS_STRING(obj);
-        else
-           buf = PyBytes_AS_STRING(obj);
-        if (i) {
-            memcpy(dest, self->ob_bytes, mysize);
-            dest += mysize;
-        }
-        memcpy(dest, buf, size);
-        dest += size;
-    }
+/* The following function breaks the notion that strings are immutable:
+   it changes the size of a string.  We get away with this only if there
+   is only one module referencing the object.  You can also think of it
+   as creating a new string object and destroying the old one, only
+   more efficiently.  In any case, don't use this if the string may
+   already be known to some other part of the code...
+   Note that if there's not enough memory to resize the string, the original
+   string object at *pv is deallocated, *pv is set to NULL, an "out of
+   memory" exception is set, and -1 is returned.  Else (on success) 0 is
+   returned, and the value in *pv may or may not be the same as on input.
+   As always, an extra byte is allocated for a trailing \0 byte (newsize
+   does *not* include that), and a trailing \0 byte is stored.
+*/
 
-    /* Done */
-    Py_DECREF(seq);
-    return result;
+int
+_PyBytes_Resize(PyObject **pv, Py_ssize_t newsize)
+{
+	register PyObject *v;
+	register PyBytesObject *sv;
+	v = *pv;
+	if (!PyBytes_Check(v) || Py_REFCNT(v) != 1 || newsize < 0) {
+		*pv = 0;
+		Py_DECREF(v);
+		PyErr_BadInternalCall();
+		return -1;
+	}
+	/* XXX UNREF/NEWREF interface should be more symmetrical */
+	_Py_DEC_REFTOTAL;
+	_Py_ForgetReference(v);
+	*pv = (PyObject *)
+		PyObject_REALLOC((char *)v, sizeof(PyBytesObject) + newsize);
+	if (*pv == NULL) {
+		PyObject_Del(v);
+		PyErr_NoMemory();
+		return -1;
+	}
+	_Py_NewReference(*pv);
+	sv = (PyBytesObject *) *pv;
+	Py_SIZE(sv) = newsize;
+	sv->ob_sval[newsize] = '\0';
+	sv->ob_shash = -1;	/* invalidate cached hash value */
+	return 0;
+}
+
+/* _PyBytes_FormatLong emulates the format codes d, u, o, x and X, and
+ * the F_ALT flag, for Python's long (unbounded) ints.  It's not used for
+ * Python's regular ints.
+ * Return value:  a new PyString*, or NULL if error.
+ *  .  *pbuf is set to point into it,
+ *     *plen set to the # of chars following that.
+ *     Caller must decref it when done using pbuf.
+ *     The string starting at *pbuf is of the form
+ *         "-"? ("0x" | "0X")? digit+
+ *     "0x"/"0X" are present only for x and X conversions, with F_ALT
+ *         set in flags.  The case of hex digits will be correct,
+ *     There will be at least prec digits, zero-filled on the left if
+ *         necessary to get that many.
+ * val		object to be converted
+ * flags	bitmask of format flags; only F_ALT is looked at
+ * prec		minimum number of digits; 0-fill on left if needed
+ * type		a character in [duoxX]; u acts the same as d
+ *
+ * CAUTION:  o, x and X conversions on regular ints can never
+ * produce a '-' sign, but can for Python's unbounded ints.
+ */
+PyObject*
+_PyBytes_FormatLong(PyObject *val, int flags, int prec, int type,
+		     char **pbuf, int *plen)
+{
+	PyObject *result = NULL;
+	char *buf;
+	Py_ssize_t i;
+	int sign;	/* 1 if '-', else 0 */
+	int len;	/* number of characters */
+	Py_ssize_t llen;
+	int numdigits;	/* len == numnondigits + numdigits */
+	int numnondigits = 0;
+
+	/* Avoid exceeding SSIZE_T_MAX */
+	if (prec > PY_SSIZE_T_MAX-3) {
+		PyErr_SetString(PyExc_OverflowError,
+				"precision too large");
+		return NULL;
+	}
 
-    /* Error handling */
-  error:
-    Py_DECREF(seq);
-    return NULL;
-}
+	switch (type) {
+	case 'd':
+	case 'u':
+		/* Special-case boolean: we want 0/1 */
+		if (PyBool_Check(val))
+			result = PyNumber_ToBase(val, 10);
+		else
+			result = Py_TYPE(val)->tp_str(val);
+		break;
+	case 'o':
+		numnondigits = 2;
+		result = PyNumber_ToBase(val, 8);
+		break;
+	case 'x':
+	case 'X':
+		numnondigits = 2;
+		result = PyNumber_ToBase(val, 16);
+		break;
+	default:
+		assert(!"'type' not in [duoxX]");
+	}
+	if (!result)
+		return NULL;
 
-PyDoc_STRVAR(fromhex_doc,
-"bytearray.fromhex(string) -> bytearray\n\
-\n\
-Create a bytearray object from a string of hexadecimal numbers.\n\
-Spaces between two numbers are accepted.\n\
-Example: bytearray.fromhex('B9 01EF') -> bytearray(b'\\xb9\\x01\\xef').");
+	buf = PyUnicode_AsString(result);
+	if (!buf) {
+		Py_DECREF(result);
+		return NULL;
+	}
 
-static int
-hex_digit_to_int(Py_UNICODE c)
-{
-    if (c >= 128)
-        return -1;
-    if (ISDIGIT(c))
-        return c - '0';
-    else {
-        if (ISUPPER(c))
-            c = TOLOWER(c);
-        if (c >= 'a' && c <= 'f')
-            return c - 'a' + 10;
-    }
-    return -1;
-}
+	/* To modify the string in-place, there can only be one reference. */
+	if (Py_REFCNT(result) != 1) {
+		PyErr_BadInternalCall();
+		return NULL;
+	}
+	llen = PyUnicode_GetSize(result);
+	if (llen > INT_MAX) {
+		PyErr_SetString(PyExc_ValueError,
+				"string too large in _PyBytes_FormatLong");
+		return NULL;
+	}
+	len = (int)llen;
+	if (buf[len-1] == 'L') {
+		--len;
+		buf[len] = '\0';
+	}
+	sign = buf[0] == '-';
+	numnondigits += sign;
+	numdigits = len - numnondigits;
+	assert(numdigits > 0);
+
+	/* Get rid of base marker unless F_ALT */
+	if (((flags & F_ALT) == 0 &&
+	    (type == 'o' || type == 'x' || type == 'X'))) {
+		assert(buf[sign] == '0');
+		assert(buf[sign+1] == 'x' || buf[sign+1] == 'X' ||
+		       buf[sign+1] == 'o');
+		numnondigits -= 2;
+		buf += 2;
+		len -= 2;
+		if (sign)
+			buf[0] = '-';
+		assert(len == numnondigits + numdigits);
+		assert(numdigits > 0);
+	}
 
-static PyObject *
-bytes_fromhex(PyObject *cls, PyObject *args)
-{
-    PyObject *newbytes, *hexobj;
-    char *buf;
-    Py_UNICODE *hex;
-    Py_ssize_t hexlen, byteslen, i, j;
-    int top, bot;
-
-    if (!PyArg_ParseTuple(args, "U:fromhex", &hexobj))
-        return NULL;
-    assert(PyUnicode_Check(hexobj));
-    hexlen = PyUnicode_GET_SIZE(hexobj);
-    hex = PyUnicode_AS_UNICODE(hexobj);
-    byteslen = hexlen/2; /* This overestimates if there are spaces */
-    newbytes = PyByteArray_FromStringAndSize(NULL, byteslen);
-    if (!newbytes)
-        return NULL;
-    buf = PyByteArray_AS_STRING(newbytes);
-    for (i = j = 0; i < hexlen; i += 2) {
-        /* skip over spaces in the input */
-        while (hex[i] == ' ')
-            i++;
-        if (i >= hexlen)
-            break;
-        top = hex_digit_to_int(hex[i]);
-        bot = hex_digit_to_int(hex[i+1]);
-        if (top == -1 || bot == -1) {
-            PyErr_Format(PyExc_ValueError,
-                         "non-hexadecimal number found in "
-                         "fromhex() arg at position %zd", i);
-            goto error;
-        }
-        buf[j++] = (top << 4) + bot;
-    }
-    if (PyByteArray_Resize(newbytes, j) < 0)
-        goto error;
-    return newbytes;
+	/* Fill with leading zeroes to meet minimum width. */
+	if (prec > numdigits) {
+		PyObject *r1 = PyBytes_FromStringAndSize(NULL,
+					numnondigits + prec);
+		char *b1;
+		if (!r1) {
+			Py_DECREF(result);
+			return NULL;
+		}
+		b1 = PyBytes_AS_STRING(r1);
+		for (i = 0; i < numnondigits; ++i)
+			*b1++ = *buf++;
+		for (i = 0; i < prec - numdigits; i++)
+			*b1++ = '0';
+		for (i = 0; i < numdigits; i++)
+			*b1++ = *buf++;
+		*b1 = '\0';
+		Py_DECREF(result);
+		result = r1;
+		buf = PyBytes_AS_STRING(result);
+		len = numnondigits + prec;
+	}
 
-  error:
-    Py_DECREF(newbytes);
-    return NULL;
+	/* Fix up case for hex conversions. */
+	if (type == 'X') {
+		/* Need to convert all lower case letters to upper case.
+		   and need to convert 0x to 0X (and -0x to -0X). */
+		for (i = 0; i < len; i++)
+			if (buf[i] >= 'a' && buf[i] <= 'x')
+				buf[i] -= 'a'-'A';
+	}
+	*pbuf = buf;
+	*plen = len;
+	return result;
 }
 
-PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
-
-static PyObject *
-bytes_reduce(PyByteArrayObject *self)
+void
+PyBytes_Fini(void)
 {
-    PyObject *latin1, *dict;
-    if (self->ob_bytes)
-        latin1 = PyUnicode_DecodeLatin1(self->ob_bytes,
-                                        Py_SIZE(self), NULL);
-    else
-        latin1 = PyUnicode_FromString("");
-
-    dict = PyObject_GetAttrString((PyObject *)self, "__dict__");
-    if (dict == NULL) {
-        PyErr_Clear();
-        dict = Py_None;
-        Py_INCREF(dict);
-    }
-
-    return Py_BuildValue("(O(Ns)N)", Py_TYPE(self), latin1, "latin-1", dict);
+	int i;
+	for (i = 0; i < UCHAR_MAX + 1; i++) {
+		Py_XDECREF(characters[i]);
+		characters[i] = NULL;
+	}
+	Py_XDECREF(nullstring);
+	nullstring = NULL;
 }
 
-static PySequenceMethods bytes_as_sequence = {
-    (lenfunc)bytes_length,              /* sq_length */
-    (binaryfunc)PyByteArray_Concat,         /* sq_concat */
-    (ssizeargfunc)bytes_repeat,         /* sq_repeat */
-    (ssizeargfunc)bytes_getitem,        /* sq_item */
-    0,                                  /* sq_slice */
-    (ssizeobjargproc)bytes_setitem,     /* sq_ass_item */
-    0,                                  /* sq_ass_slice */
-    (objobjproc)bytes_contains,         /* sq_contains */
-    (binaryfunc)bytes_iconcat,          /* sq_inplace_concat */
-    (ssizeargfunc)bytes_irepeat,        /* sq_inplace_repeat */
-};
-
-static PyMappingMethods bytes_as_mapping = {
-    (lenfunc)bytes_length,
-    (binaryfunc)bytes_subscript,
-    (objobjargproc)bytes_ass_subscript,
-};
-
-static PyBufferProcs bytes_as_buffer = {
-    (getbufferproc)bytes_getbuffer,
-    (releasebufferproc)bytes_releasebuffer,
-};
-
-static PyMethodDef
-bytes_methods[] = {
-    {"__alloc__", (PyCFunction)bytes_alloc, METH_NOARGS, alloc_doc},
-    {"__reduce__", (PyCFunction)bytes_reduce, METH_NOARGS, reduce_doc},
-    {"append", (PyCFunction)bytes_append, METH_O, append__doc__},
-    {"capitalize", (PyCFunction)stringlib_capitalize, METH_NOARGS,
-     _Py_capitalize__doc__},
-    {"center", (PyCFunction)stringlib_center, METH_VARARGS, center__doc__},
-    {"count", (PyCFunction)bytes_count, METH_VARARGS, count__doc__},
-    {"decode", (PyCFunction)bytes_decode, METH_VARARGS, decode_doc},
-    {"endswith", (PyCFunction)bytes_endswith, METH_VARARGS, endswith__doc__},
-    {"expandtabs", (PyCFunction)stringlib_expandtabs, METH_VARARGS,
-     expandtabs__doc__},
-    {"extend", (PyCFunction)bytes_extend, METH_O, extend__doc__},
-    {"find", (PyCFunction)bytes_find, METH_VARARGS, find__doc__},
-    {"fromhex", (PyCFunction)bytes_fromhex, METH_VARARGS|METH_CLASS,
-     fromhex_doc},
-    {"index", (PyCFunction)bytes_index, METH_VARARGS, index__doc__},
-    {"insert", (PyCFunction)bytes_insert, METH_VARARGS, insert__doc__},
-    {"isalnum", (PyCFunction)stringlib_isalnum, METH_NOARGS,
-     _Py_isalnum__doc__},
-    {"isalpha", (PyCFunction)stringlib_isalpha, METH_NOARGS,
-     _Py_isalpha__doc__},
-    {"isdigit", (PyCFunction)stringlib_isdigit, METH_NOARGS,
-     _Py_isdigit__doc__},
-    {"islower", (PyCFunction)stringlib_islower, METH_NOARGS,
-     _Py_islower__doc__},
-    {"isspace", (PyCFunction)stringlib_isspace, METH_NOARGS,
-     _Py_isspace__doc__},
-    {"istitle", (PyCFunction)stringlib_istitle, METH_NOARGS,
-     _Py_istitle__doc__},
-    {"isupper", (PyCFunction)stringlib_isupper, METH_NOARGS,
-     _Py_isupper__doc__},
-    {"join", (PyCFunction)bytes_join, METH_O, join_doc},
-    {"ljust", (PyCFunction)stringlib_ljust, METH_VARARGS, ljust__doc__},
-    {"lower", (PyCFunction)stringlib_lower, METH_NOARGS, _Py_lower__doc__},
-    {"lstrip", (PyCFunction)bytes_lstrip, METH_VARARGS, lstrip__doc__},
-    {"partition", (PyCFunction)bytes_partition, METH_O, partition__doc__},
-    {"pop", (PyCFunction)bytes_pop, METH_VARARGS, pop__doc__},
-    {"remove", (PyCFunction)bytes_remove, METH_O, remove__doc__},
-    {"replace", (PyCFunction)bytes_replace, METH_VARARGS, replace__doc__},
-    {"reverse", (PyCFunction)bytes_reverse, METH_NOARGS, reverse__doc__},
-    {"rfind", (PyCFunction)bytes_rfind, METH_VARARGS, rfind__doc__},
-    {"rindex", (PyCFunction)bytes_rindex, METH_VARARGS, rindex__doc__},
-    {"rjust", (PyCFunction)stringlib_rjust, METH_VARARGS, rjust__doc__},
-    {"rpartition", (PyCFunction)bytes_rpartition, METH_O, rpartition__doc__},
-    {"rsplit", (PyCFunction)bytes_rsplit, METH_VARARGS, rsplit__doc__},
-    {"rstrip", (PyCFunction)bytes_rstrip, METH_VARARGS, rstrip__doc__},
-    {"split", (PyCFunction)bytes_split, METH_VARARGS, split__doc__},
-    {"splitlines", (PyCFunction)stringlib_splitlines, METH_VARARGS,
-     splitlines__doc__},
-    {"startswith", (PyCFunction)bytes_startswith, METH_VARARGS ,
-     startswith__doc__},
-    {"strip", (PyCFunction)bytes_strip, METH_VARARGS, strip__doc__},
-    {"swapcase", (PyCFunction)stringlib_swapcase, METH_NOARGS,
-     _Py_swapcase__doc__},
-    {"title", (PyCFunction)stringlib_title, METH_NOARGS, _Py_title__doc__},
-    {"translate", (PyCFunction)bytes_translate, METH_VARARGS,
-     translate__doc__},
-    {"upper", (PyCFunction)stringlib_upper, METH_NOARGS, _Py_upper__doc__},
-    {"zfill", (PyCFunction)stringlib_zfill, METH_VARARGS, zfill__doc__},
-    {NULL}
-};
-
-PyDoc_STRVAR(bytes_doc,
-"bytearray(iterable_of_ints) -> bytearray.\n\
-bytearray(string, encoding[, errors]) -> bytearray.\n\
-bytearray(bytes_or_bytearray) -> mutable copy of bytes_or_bytearray.\n\
-bytearray(memory_view) -> bytearray.\n\
-\n\
-Construct an mutable bytearray object from:\n\
-  - an iterable yielding integers in range(256)\n\
-  - a text string encoded using the specified encoding\n\
-  - a bytes or a bytearray object\n\
-  - any object implementing the buffer API.\n\
-\n\
-bytearray(int) -> bytearray.\n\
-\n\
-Construct a zero-initialized bytearray of the given length.");
-
-
-static PyObject *bytes_iter(PyObject *seq);
-
-PyTypeObject PyByteArray_Type = {
-    PyVarObject_HEAD_INIT(&PyType_Type, 0)
-    "bytearray",
-    sizeof(PyByteArrayObject),
-    0,
-    (destructor)bytes_dealloc,          /* tp_dealloc */
-    0,                                  /* tp_print */
-    0,                                  /* tp_getattr */
-    0,                                  /* tp_setattr */
-    0,                                  /* tp_compare */
-    (reprfunc)bytes_repr,               /* tp_repr */
-    0,                                  /* tp_as_number */
-    &bytes_as_sequence,                 /* tp_as_sequence */
-    &bytes_as_mapping,                  /* tp_as_mapping */
-    0,                                  /* tp_hash */
-    0,                                  /* tp_call */
-    bytes_str,                          /* tp_str */
-    PyObject_GenericGetAttr,            /* tp_getattro */
-    0,                                  /* tp_setattro */
-    &bytes_as_buffer,                   /* tp_as_buffer */
-    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
-    bytes_doc,                          /* tp_doc */
-    0,                                  /* tp_traverse */
-    0,                                  /* tp_clear */
-    (richcmpfunc)bytes_richcompare,     /* tp_richcompare */
-    0,                                  /* tp_weaklistoffset */
-    bytes_iter,                         /* tp_iter */
-    0,                                  /* tp_iternext */
-    bytes_methods,                      /* tp_methods */
-    0,                                  /* tp_members */
-    0,                                  /* tp_getset */
-    0,                                  /* tp_base */
-    0,                                  /* tp_dict */
-    0,                                  /* tp_descr_get */
-    0,                                  /* tp_descr_set */
-    0,                                  /* tp_dictoffset */
-    (initproc)bytes_init,               /* tp_init */
-    PyType_GenericAlloc,                /* tp_alloc */
-    PyType_GenericNew,                  /* tp_new */
-    PyObject_Del,                       /* tp_free */
-};
-
-/*********************** Bytes Iterator ****************************/
+/*********************** Str Iterator ****************************/
 
 typedef struct {
-    PyObject_HEAD
-    Py_ssize_t it_index;
-    PyByteArrayObject *it_seq; /* Set to NULL when iterator is exhausted */
-} bytesiterobject;
+	PyObject_HEAD
+	Py_ssize_t it_index;
+	PyBytesObject *it_seq; /* Set to NULL when iterator is exhausted */
+} striterobject;
 
 static void
-bytesiter_dealloc(bytesiterobject *it)
+striter_dealloc(striterobject *it)
 {
-    _PyObject_GC_UNTRACK(it);
-    Py_XDECREF(it->it_seq);
-    PyObject_GC_Del(it);
+	_PyObject_GC_UNTRACK(it);
+	Py_XDECREF(it->it_seq);
+	PyObject_GC_Del(it);
 }
 
 static int
-bytesiter_traverse(bytesiterobject *it, visitproc visit, void *arg)
+striter_traverse(striterobject *it, visitproc visit, void *arg)
 {
-    Py_VISIT(it->it_seq);
-    return 0;
+	Py_VISIT(it->it_seq);
+	return 0;
 }
 
 static PyObject *
-bytesiter_next(bytesiterobject *it)
-{
-    PyByteArrayObject *seq;
-    PyObject *item;
-
-    assert(it != NULL);
-    seq = it->it_seq;
-    if (seq == NULL)
-        return NULL;
-    assert(PyByteArray_Check(seq));
-
-    if (it->it_index < PyByteArray_GET_SIZE(seq)) {
-        item = PyLong_FromLong(
-            (unsigned char)seq->ob_bytes[it->it_index]);
-        if (item != NULL)
-            ++it->it_index;
-        return item;
-    }
+striter_next(striterobject *it)
+{
+	PyBytesObject *seq;
+	PyObject *item;
+
+	assert(it != NULL);
+	seq = it->it_seq;
+	if (seq == NULL)
+		return NULL;
+	assert(PyBytes_Check(seq));
+
+	if (it->it_index < PyBytes_GET_SIZE(seq)) {
+		item = PyLong_FromLong(
+			(unsigned char)seq->ob_sval[it->it_index]);
+		if (item != NULL)
+			++it->it_index;
+		return item;
+	}
 
-    Py_DECREF(seq);
-    it->it_seq = NULL;
-    return NULL;
+	Py_DECREF(seq);
+	it->it_seq = NULL;
+	return NULL;
 }
 
 static PyObject *
-bytesiter_length_hint(bytesiterobject *it)
+striter_len(striterobject *it)
 {
-    Py_ssize_t len = 0;
-    if (it->it_seq)
-        len = PyByteArray_GET_SIZE(it->it_seq) - it->it_index;
-    return PyLong_FromSsize_t(len);
+	Py_ssize_t len = 0;
+	if (it->it_seq)
+		len = PyBytes_GET_SIZE(it->it_seq) - it->it_index;
+	return PyLong_FromSsize_t(len);
 }
 
 PyDoc_STRVAR(length_hint_doc,
-    "Private method returning an estimate of len(list(it)).");
+	     "Private method returning an estimate of len(list(it)).");
 
-static PyMethodDef bytesiter_methods[] = {
-    {"__length_hint__", (PyCFunction)bytesiter_length_hint, METH_NOARGS,
-     length_hint_doc},
-    {NULL, NULL} /* sentinel */
+static PyMethodDef striter_methods[] = {
+	{"__length_hint__", (PyCFunction)striter_len, METH_NOARGS,
+	 length_hint_doc},
+ 	{NULL,		NULL}		/* sentinel */
 };
 
-PyTypeObject PyByteArrayIter_Type = {
-    PyVarObject_HEAD_INIT(&PyType_Type, 0)
-    "bytearray_iterator",              /* tp_name */
-    sizeof(bytesiterobject),           /* tp_basicsize */
-    0,                                 /* tp_itemsize */
-    /* methods */
-    (destructor)bytesiter_dealloc,     /* tp_dealloc */
-    0,                                 /* tp_print */
-    0,                                 /* tp_getattr */
-    0,                                 /* tp_setattr */
-    0,                                 /* tp_compare */
-    0,                                 /* tp_repr */
-    0,                                 /* tp_as_number */
-    0,                                 /* tp_as_sequence */
-    0,                                 /* tp_as_mapping */
-    0,                                 /* tp_hash */
-    0,                                 /* tp_call */
-    0,                                 /* tp_str */
-    PyObject_GenericGetAttr,           /* tp_getattro */
-    0,                                 /* tp_setattro */
-    0,                                 /* tp_as_buffer */
-    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
-    0,                                 /* tp_doc */
-    (traverseproc)bytesiter_traverse,  /* tp_traverse */
-    0,                                 /* tp_clear */
-    0,                                 /* tp_richcompare */
-    0,                                 /* tp_weaklistoffset */
-    PyObject_SelfIter,                 /* tp_iter */
-    (iternextfunc)bytesiter_next,      /* tp_iternext */
-    bytesiter_methods,                 /* tp_methods */
-    0,
+PyTypeObject PyBytesIter_Type = {
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
+	"bytes_iterator",			/* tp_name */
+	sizeof(striterobject),			/* tp_basicsize */
+	0,					/* tp_itemsize */
+	/* methods */
+	(destructor)striter_dealloc,		/* tp_dealloc */
+	0,					/* tp_print */
+	0,					/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_compare */
+	0,					/* tp_repr */
+	0,					/* tp_as_number */
+	0,					/* tp_as_sequence */
+	0,					/* tp_as_mapping */
+	0,					/* tp_hash */
+	0,					/* tp_call */
+	0,					/* tp_str */
+	PyObject_GenericGetAttr,		/* tp_getattro */
+	0,					/* tp_setattro */
+	0,					/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
+	0,					/* tp_doc */
+	(traverseproc)striter_traverse,	/* tp_traverse */
+	0,					/* tp_clear */
+	0,					/* tp_richcompare */
+	0,					/* tp_weaklistoffset */
+	PyObject_SelfIter,			/* tp_iter */
+	(iternextfunc)striter_next,		/* tp_iternext */
+	striter_methods,			/* tp_methods */
+	0,
 };
 
 static PyObject *
-bytes_iter(PyObject *seq)
+str_iter(PyObject *seq)
 {
-    bytesiterobject *it;
+	striterobject *it;
 
-    if (!PyByteArray_Check(seq)) {
-        PyErr_BadInternalCall();
-        return NULL;
-    }
-    it = PyObject_GC_New(bytesiterobject, &PyByteArrayIter_Type);
-    if (it == NULL)
-        return NULL;
-    it->it_index = 0;
-    Py_INCREF(seq);
-    it->it_seq = (PyByteArrayObject *)seq;
-    _PyObject_GC_TRACK(it);
-    return (PyObject *)it;
+	if (!PyBytes_Check(seq)) {
+		PyErr_BadInternalCall();
+		return NULL;
+	}
+	it = PyObject_GC_New(striterobject, &PyBytesIter_Type);
+	if (it == NULL)
+		return NULL;
+	it->it_index = 0;
+	Py_INCREF(seq);
+	it->it_seq = (PyBytesObject *)seq;
+	_PyObject_GC_TRACK(it);
+	return (PyObject *)it;
 }
diff --git a/Objects/stringobject.c b/Objects/stringobject.c
deleted file mode 100644
index b9ba73f..0000000
--- a/Objects/stringobject.c
+++ /dev/null
@@ -1,3429 +0,0 @@
-/* String object implementation */
-
-/* XXX This is now called 'bytes' as far as the user is concerned.
-   Many docstrings and error messages need to be cleaned up. */
-
-#define PY_SSIZE_T_CLEAN
-
-#include "Python.h"
-
-#include "bytes_methods.h"
-
-static Py_ssize_t
-_getbuffer(PyObject *obj, Py_buffer *view)
-{
-    PyBufferProcs *buffer = Py_TYPE(obj)->tp_as_buffer;
-
-    if (buffer == NULL || buffer->bf_getbuffer == NULL)
-    {
-        PyErr_Format(PyExc_TypeError,
-                     "Type %.100s doesn't support the buffer API",
-                     Py_TYPE(obj)->tp_name);
-        return -1;
-    }
-
-    if (buffer->bf_getbuffer(obj, view, PyBUF_SIMPLE) < 0)
-            return -1;
-    return view->len;
-}
-
-#ifdef COUNT_ALLOCS
-int null_strings, one_strings;
-#endif
-
-static PyBytesObject *characters[UCHAR_MAX + 1];
-static PyBytesObject *nullstring;
-
-/*
-   For both PyBytes_FromString() and PyBytes_FromStringAndSize(), the
-   parameter `size' denotes number of characters to allocate, not counting any
-   null terminating character.
-
-   For PyBytes_FromString(), the parameter `str' points to a null-terminated
-   string containing exactly `size' bytes.
-
-   For PyBytes_FromStringAndSize(), the parameter the parameter `str' is
-   either NULL or else points to a string containing at least `size' bytes.
-   For PyBytes_FromStringAndSize(), the string in the `str' parameter does
-   not have to be null-terminated.  (Therefore it is safe to construct a
-   substring by calling `PyBytes_FromStringAndSize(origstring, substrlen)'.)
-   If `str' is NULL then PyBytes_FromStringAndSize() will allocate `size+1'
-   bytes (setting the last byte to the null terminating character) and you can
-   fill in the data yourself.  If `str' is non-NULL then the resulting
-   PyString object must be treated as immutable and you must not fill in nor
-   alter the data yourself, since the strings may be shared.
-
-   The PyObject member `op->ob_size', which denotes the number of "extra
-   items" in a variable-size object, will contain the number of bytes
-   allocated for string data, not counting the null terminating character.  It
-   is therefore equal to the equal to the `size' parameter (for
-   PyBytes_FromStringAndSize()) or the length of the string in the `str'
-   parameter (for PyBytes_FromString()).
-*/
-PyObject *
-PyBytes_FromStringAndSize(const char *str, Py_ssize_t size)
-{
-	register PyBytesObject *op;
-	if (size < 0) {
-		PyErr_SetString(PyExc_SystemError,
-		    "Negative size passed to PyBytes_FromStringAndSize");
-		return NULL;
-	}
-	if (size == 0 && (op = nullstring) != NULL) {
-#ifdef COUNT_ALLOCS
-		null_strings++;
-#endif
-		Py_INCREF(op);
-		return (PyObject *)op;
-	}
-	if (size == 1 && str != NULL &&
-	    (op = characters[*str & UCHAR_MAX]) != NULL)
-	{
-#ifdef COUNT_ALLOCS
-		one_strings++;
-#endif
-		Py_INCREF(op);
-		return (PyObject *)op;
-	}
-
-	/* Inline PyObject_NewVar */
-	op = (PyBytesObject *)PyObject_MALLOC(sizeof(PyBytesObject) + size);
-	if (op == NULL)
-		return PyErr_NoMemory();
-	PyObject_INIT_VAR(op, &PyBytes_Type, size);
-	op->ob_shash = -1;
-	if (str != NULL)
-		Py_MEMCPY(op->ob_sval, str, size);
-	op->ob_sval[size] = '\0';
-	/* share short strings */
-	if (size == 0) {
-		nullstring = op;
-		Py_INCREF(op);
-	} else if (size == 1 && str != NULL) {
-		characters[*str & UCHAR_MAX] = op;
-		Py_INCREF(op);
-	}
-	return (PyObject *) op;
-}
-
-PyObject *
-PyBytes_FromString(const char *str)
-{
-	register size_t size;
-	register PyBytesObject *op;
-
-	assert(str != NULL);
-	size = strlen(str);
-	if (size > PY_SSIZE_T_MAX) {
-		PyErr_SetString(PyExc_OverflowError,
-			"string is too long for a Python string");
-		return NULL;
-	}
-	if (size == 0 && (op = nullstring) != NULL) {
-#ifdef COUNT_ALLOCS
-		null_strings++;
-#endif
-		Py_INCREF(op);
-		return (PyObject *)op;
-	}
-	if (size == 1 && (op = characters[*str & UCHAR_MAX]) != NULL) {
-#ifdef COUNT_ALLOCS
-		one_strings++;
-#endif
-		Py_INCREF(op);
-		return (PyObject *)op;
-	}
-
-	/* Inline PyObject_NewVar */
-	op = (PyBytesObject *)PyObject_MALLOC(sizeof(PyBytesObject) + size);
-	if (op == NULL)
-		return PyErr_NoMemory();
-	PyObject_INIT_VAR(op, &PyBytes_Type, size);
-	op->ob_shash = -1;
-	Py_MEMCPY(op->ob_sval, str, size+1);
-	/* share short strings */
-	if (size == 0) {
-		nullstring = op;
-		Py_INCREF(op);
-	} else if (size == 1) {
-		characters[*str & UCHAR_MAX] = op;
-		Py_INCREF(op);
-	}
-	return (PyObject *) op;
-}
-
-PyObject *
-PyBytes_FromFormatV(const char *format, va_list vargs)
-{
-	va_list count;
-	Py_ssize_t n = 0;
-	const char* f;
-	char *s;
-	PyObject* string;
-
-#ifdef VA_LIST_IS_ARRAY
-	Py_MEMCPY(count, vargs, sizeof(va_list));
-#else
-#ifdef  __va_copy
-	__va_copy(count, vargs);
-#else
-	count = vargs;
-#endif
-#endif
-	/* step 1: figure out how large a buffer we need */
-	for (f = format; *f; f++) {
-		if (*f == '%') {
-			const char* p = f;
-			while (*++f && *f != '%' && !ISALPHA(*f))
-				;
-
-			/* skip the 'l' or 'z' in {%ld, %zd, %lu, %zu} since
-			 * they don't affect the amount of space we reserve.
-			 */
-			if ((*f == 'l' || *f == 'z') &&
-					(f[1] == 'd' || f[1] == 'u'))
-				++f;
-
-			switch (*f) {
-			case 'c':
-				(void)va_arg(count, int);
-				/* fall through... */
-			case '%':
-				n++;
-				break;
-			case 'd': case 'u': case 'i': case 'x':
-				(void) va_arg(count, int);
-				/* 20 bytes is enough to hold a 64-bit
-				   integer.  Decimal takes the most space.
-				   This isn't enough for octal. */
-				n += 20;
-				break;
-			case 's':
-				s = va_arg(count, char*);
-				n += strlen(s);
-				break;
-			case 'p':
-				(void) va_arg(count, int);
-				/* maximum 64-bit pointer representation:
-				 * 0xffffffffffffffff
-				 * so 19 characters is enough.
-				 * XXX I count 18 -- what's the extra for?
-				 */
-				n += 19;
-				break;
-			default:
-				/* if we stumble upon an unknown
-				   formatting code, copy the rest of
-				   the format string to the output
-				   string. (we cannot just skip the
-				   code, since there's no way to know
-				   what's in the argument list) */
-				n += strlen(p);
-				goto expand;
-			}
-		} else
-			n++;
-	}
- expand:
-	/* step 2: fill the buffer */
-	/* Since we've analyzed how much space we need for the worst case,
-	   use sprintf directly instead of the slower PyOS_snprintf. */
-	string = PyBytes_FromStringAndSize(NULL, n);
-	if (!string)
-		return NULL;
-
-	s = PyBytes_AsString(string);
-
-	for (f = format; *f; f++) {
-		if (*f == '%') {
-			const char* p = f++;
-			Py_ssize_t i;
-			int longflag = 0;
-			int size_tflag = 0;
-			/* parse the width.precision part (we're only
-			   interested in the precision value, if any) */
-			n = 0;
-			while (ISDIGIT(*f))
-				n = (n*10) + *f++ - '0';
-			if (*f == '.') {
-				f++;
-				n = 0;
-				while (ISDIGIT(*f))
-					n = (n*10) + *f++ - '0';
-			}
-			while (*f && *f != '%' && !ISALPHA(*f))
-				f++;
-			/* handle the long flag, but only for %ld and %lu.
-			   others can be added when necessary. */
-			if (*f == 'l' && (f[1] == 'd' || f[1] == 'u')) {
-				longflag = 1;
-				++f;
-			}
-			/* handle the size_t flag. */
-			if (*f == 'z' && (f[1] == 'd' || f[1] == 'u')) {
-				size_tflag = 1;
-				++f;
-			}
-
-			switch (*f) {
-			case 'c':
-				*s++ = va_arg(vargs, int);
-				break;
-			case 'd':
-				if (longflag)
-					sprintf(s, "%ld", va_arg(vargs, long));
-				else if (size_tflag)
-					sprintf(s, "%" PY_FORMAT_SIZE_T "d",
-					        va_arg(vargs, Py_ssize_t));
-				else
-					sprintf(s, "%d", va_arg(vargs, int));
-				s += strlen(s);
-				break;
-			case 'u':
-				if (longflag)
-					sprintf(s, "%lu",
-						va_arg(vargs, unsigned long));
-				else if (size_tflag)
-					sprintf(s, "%" PY_FORMAT_SIZE_T "u",
-					        va_arg(vargs, size_t));
-				else
-					sprintf(s, "%u",
-						va_arg(vargs, unsigned int));
-				s += strlen(s);
-				break;
-			case 'i':
-				sprintf(s, "%i", va_arg(vargs, int));
-				s += strlen(s);
-				break;
-			case 'x':
-				sprintf(s, "%x", va_arg(vargs, int));
-				s += strlen(s);
-				break;
-			case 's':
-				p = va_arg(vargs, char*);
-				i = strlen(p);
-				if (n > 0 && i > n)
-					i = n;
-				Py_MEMCPY(s, p, i);
-				s += i;
-				break;
-			case 'p':
-				sprintf(s, "%p", va_arg(vargs, void*));
-				/* %p is ill-defined:  ensure leading 0x. */
-				if (s[1] == 'X')
-					s[1] = 'x';
-				else if (s[1] != 'x') {
-					memmove(s+2, s, strlen(s)+1);
-					s[0] = '0';
-					s[1] = 'x';
-				}
-				s += strlen(s);
-				break;
-			case '%':
-				*s++ = '%';
-				break;
-			default:
-				strcpy(s, p);
-				s += strlen(s);
-				goto end;
-			}
-		} else
-			*s++ = *f;
-	}
-
- end:
-	_PyBytes_Resize(&string, s - PyBytes_AS_STRING(string));
-	return string;
-}
-
-PyObject *
-PyBytes_FromFormat(const char *format, ...)
-{
-	PyObject* ret;
-	va_list vargs;
-
-#ifdef HAVE_STDARG_PROTOTYPES
-	va_start(vargs, format);
-#else
-	va_start(vargs);
-#endif
-	ret = PyBytes_FromFormatV(format, vargs);
-	va_end(vargs);
-	return ret;
-}
-
-static void
-string_dealloc(PyObject *op)
-{
-	Py_TYPE(op)->tp_free(op);
-}
-
-/* Unescape a backslash-escaped string. If unicode is non-zero,
-   the string is a u-literal. If recode_encoding is non-zero,
-   the string is UTF-8 encoded and should be re-encoded in the
-   specified encoding.  */
-
-PyObject *PyBytes_DecodeEscape(const char *s,
-				Py_ssize_t len,
-				const char *errors,
-				Py_ssize_t unicode,
-				const char *recode_encoding)
-{
-	int c;
-	char *p, *buf;
-	const char *end;
-	PyObject *v;
-	Py_ssize_t newlen = recode_encoding ? 4*len:len;
-	v = PyBytes_FromStringAndSize((char *)NULL, newlen);
-	if (v == NULL)
-		return NULL;
-	p = buf = PyBytes_AsString(v);
-	end = s + len;
-	while (s < end) {
-		if (*s != '\\') {
-		  non_esc:
-			if (recode_encoding && (*s & 0x80)) {
-				PyObject *u, *w;
-				char *r;
-				const char* t;
-				Py_ssize_t rn;
-				t = s;
-				/* Decode non-ASCII bytes as UTF-8. */
-				while (t < end && (*t & 0x80)) t++;
-				u = PyUnicode_DecodeUTF8(s, t - s, errors);
-				if(!u) goto failed;
-
-				/* Recode them in target encoding. */
-				w = PyUnicode_AsEncodedString(
-					u, recode_encoding, errors);
-				Py_DECREF(u);
-				if (!w)	goto failed;
-
-				/* Append bytes to output buffer. */
-				assert(PyBytes_Check(w));
-				r = PyBytes_AS_STRING(w);
-				rn = PyBytes_GET_SIZE(w);
-				Py_MEMCPY(p, r, rn);
-				p += rn;
-				Py_DECREF(w);
-				s = t;
-			} else {
-				*p++ = *s++;
-			}
-			continue;
-		}
-		s++;
-		if (s==end) {
-			PyErr_SetString(PyExc_ValueError,
-					"Trailing \\ in string");
-			goto failed;
-		}
-		switch (*s++) {
-		/* XXX This assumes ASCII! */
-		case '\n': break;
-		case '\\': *p++ = '\\'; break;
-		case '\'': *p++ = '\''; break;
-		case '\"': *p++ = '\"'; break;
-		case 'b': *p++ = '\b'; break;
-		case 'f': *p++ = '\014'; break; /* FF */
-		case 't': *p++ = '\t'; break;
-		case 'n': *p++ = '\n'; break;
-		case 'r': *p++ = '\r'; break;
-		case 'v': *p++ = '\013'; break; /* VT */
-		case 'a': *p++ = '\007'; break; /* BEL, not classic C */
-		case '0': case '1': case '2': case '3':
-		case '4': case '5': case '6': case '7':
-			c = s[-1] - '0';
-			if (s < end && '0' <= *s && *s <= '7') {
-				c = (c<<3) + *s++ - '0';
-				if (s < end && '0' <= *s && *s <= '7')
-					c = (c<<3) + *s++ - '0';
-			}
-			*p++ = c;
-			break;
-		case 'x':
-			if (s+1 < end && ISXDIGIT(s[0]) && ISXDIGIT(s[1])) {
-				unsigned int x = 0;
-				c = Py_CHARMASK(*s);
-				s++;
-				if (ISDIGIT(c))
-					x = c - '0';
-				else if (ISLOWER(c))
-					x = 10 + c - 'a';
-				else
-					x = 10 + c - 'A';
-				x = x << 4;
-				c = Py_CHARMASK(*s);
-				s++;
-				if (ISDIGIT(c))
-					x += c - '0';
-				else if (ISLOWER(c))
-					x += 10 + c - 'a';
-				else
-					x += 10 + c - 'A';
-				*p++ = x;
-				break;
-			}
-			if (!errors || strcmp(errors, "strict") == 0) {
-				PyErr_SetString(PyExc_ValueError,
-						"invalid \\x escape");
-				goto failed;
-			}
-			if (strcmp(errors, "replace") == 0) {
-				*p++ = '?';
-			} else if (strcmp(errors, "ignore") == 0)
-				/* do nothing */;
-			else {
-				PyErr_Format(PyExc_ValueError,
-					     "decoding error; unknown "
-					     "error handling code: %.400s",
-					     errors);
-				goto failed;
-			}
-		default:
-			*p++ = '\\';
-			s--;
-			goto non_esc; /* an arbitry number of unescaped
-					 UTF-8 bytes may follow. */
-		}
-	}
-	if (p-buf < newlen)
-		_PyBytes_Resize(&v, p - buf);
-	return v;
-  failed:
-	Py_DECREF(v);
-	return NULL;
-}
-
-/* -------------------------------------------------------------------- */
-/* object api */
-
-Py_ssize_t
-PyBytes_Size(register PyObject *op)
-{
-	if (!PyBytes_Check(op)) {
-		PyErr_Format(PyExc_TypeError,
-		     "expected bytes, %.200s found", Py_TYPE(op)->tp_name);
-		return -1;
-	}
-	return Py_SIZE(op);
-}
-
-char *
-PyBytes_AsString(register PyObject *op)
-{
-	if (!PyBytes_Check(op)) {
-		PyErr_Format(PyExc_TypeError,
-		     "expected bytes, %.200s found", Py_TYPE(op)->tp_name);
-		return NULL;
-	}
-	return ((PyBytesObject *)op)->ob_sval;
-}
-
-int
-PyBytes_AsStringAndSize(register PyObject *obj,
-			 register char **s,
-			 register Py_ssize_t *len)
-{
-	if (s == NULL) {
-		PyErr_BadInternalCall();
-		return -1;
-	}
-
-	if (!PyBytes_Check(obj)) {
-		PyErr_Format(PyExc_TypeError,
-		     "expected bytes, %.200s found", Py_TYPE(obj)->tp_name);
-		return -1;
-	}
-
-	*s = PyBytes_AS_STRING(obj);
-	if (len != NULL)
-		*len = PyBytes_GET_SIZE(obj);
-	else if (strlen(*s) != (size_t)PyBytes_GET_SIZE(obj)) {
-		PyErr_SetString(PyExc_TypeError,
-				"expected bytes with no null");
-		return -1;
-	}
-	return 0;
-}
-
-/* -------------------------------------------------------------------- */
-/* Methods */
-
-#define STRINGLIB_CHAR char
-
-#define STRINGLIB_CMP memcmp
-#define STRINGLIB_LEN PyBytes_GET_SIZE
-#define STRINGLIB_NEW PyBytes_FromStringAndSize
-#define STRINGLIB_STR PyBytes_AS_STRING
-/* #define STRINGLIB_WANT_CONTAINS_OBJ 1 */
-
-#define STRINGLIB_EMPTY nullstring
-#define STRINGLIB_CHECK_EXACT PyBytes_CheckExact
-#define STRINGLIB_MUTABLE 0
-
-#include "stringlib/fastsearch.h"
-
-#include "stringlib/count.h"
-#include "stringlib/find.h"
-#include "stringlib/partition.h"
-#include "stringlib/ctype.h"
-#include "stringlib/transmogrify.h"
-
-#define _Py_InsertThousandsGrouping _PyBytes_InsertThousandsGrouping
-#include "stringlib/localeutil.h"
-
-PyObject *
-PyBytes_Repr(PyObject *obj, int smartquotes)
-{
-	static const char *hexdigits = "0123456789abcdef";
-	register PyBytesObject* op = (PyBytesObject*) obj;
-	Py_ssize_t length = Py_SIZE(op);
-	size_t newsize = 3 + 4 * length;
-	PyObject *v;
-	if (newsize > PY_SSIZE_T_MAX || (newsize-3) / 4 != length) {
-		PyErr_SetString(PyExc_OverflowError,
-			"bytes object is too large to make repr");
-                return NULL;
-	}
-	v = PyUnicode_FromUnicode(NULL, newsize);
-	if (v == NULL) {
-		return NULL;
-	}
-	else {
-		register Py_ssize_t i;
-		register Py_UNICODE c;
-		register Py_UNICODE *p = PyUnicode_AS_UNICODE(v);
-		int quote;
-
-		/* Figure out which quote to use; single is preferred */
-		quote = '\'';
-		if (smartquotes) {
-			char *test, *start;
-			start = PyBytes_AS_STRING(op);
-			for (test = start; test < start+length; ++test) {
-				if (*test == '"') {
-					quote = '\''; /* back to single */
-					goto decided;
-				}
-				else if (*test == '\'')
-					quote = '"';
-			}
-			decided:
-			;
-		}
-
-		*p++ = 'b', *p++ = quote;
-		for (i = 0; i < length; i++) {
-			/* There's at least enough room for a hex escape
-			   and a closing quote. */
-			assert(newsize - (p - PyUnicode_AS_UNICODE(v)) >= 5);
-			c = op->ob_sval[i];
-			if (c == quote || c == '\\')
-				*p++ = '\\', *p++ = c;
-			else if (c == '\t')
-				*p++ = '\\', *p++ = 't';
-			else if (c == '\n')
-				*p++ = '\\', *p++ = 'n';
-			else if (c == '\r')
-				*p++ = '\\', *p++ = 'r';
-			else if (c < ' ' || c >= 0x7f) {
-				*p++ = '\\';
-				*p++ = 'x';
-				*p++ = hexdigits[(c & 0xf0) >> 4];
-				*p++ = hexdigits[c & 0xf];
-			}
-			else
-				*p++ = c;
-		}
-		assert(newsize - (p - PyUnicode_AS_UNICODE(v)) >= 1);
-		*p++ = quote;
-		*p = '\0';
-		if (PyUnicode_Resize(&v, (p - PyUnicode_AS_UNICODE(v)))) {
-			Py_DECREF(v);
-			return NULL;
-		}
-		return v;
-	}
-}
-
-static PyObject *
-string_repr(PyObject *op)
-{
-	return PyBytes_Repr(op, 1);
-}
-
-static PyObject *
-string_str(PyObject *op)
-{
-	if (Py_BytesWarningFlag) {
-		if (PyErr_WarnEx(PyExc_BytesWarning,
-				 "str() on a bytes instance", 1))
-			return NULL;
-	}
-	return string_repr(op);
-}
-
-static Py_ssize_t
-string_length(PyBytesObject *a)
-{
-	return Py_SIZE(a);
-}
-
-/* This is also used by PyBytes_Concat() */
-static PyObject *
-string_concat(PyObject *a, PyObject *b)
-{
-	Py_ssize_t size;
-	Py_buffer va, vb;
-	PyObject *result = NULL;
-
-	va.len = -1;
-	vb.len = -1;
-	if (_getbuffer(a, &va) < 0  ||
-	    _getbuffer(b, &vb) < 0) {
-		PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
-			     Py_TYPE(a)->tp_name, Py_TYPE(b)->tp_name);
-		goto done;
-	}
-
-	/* Optimize end cases */
-	if (va.len == 0 && PyBytes_CheckExact(b)) {
-		result = b;
-		Py_INCREF(result);
-		goto done;
-	}
-	if (vb.len == 0 && PyBytes_CheckExact(a)) {
-		result = a;
-		Py_INCREF(result);
-		goto done;
-	}
-
-	size = va.len + vb.len;
-	if (size < 0) {
-		PyErr_NoMemory();
-		goto done;
-	}
-
-	result = PyBytes_FromStringAndSize(NULL, size);
-	if (result != NULL) {
-		memcpy(PyBytes_AS_STRING(result), va.buf, va.len);
-		memcpy(PyBytes_AS_STRING(result) + va.len, vb.buf, vb.len);
-	}
-
-  done:
-	if (va.len != -1)
-		PyObject_ReleaseBuffer(a, &va);
-	if (vb.len != -1)
-		PyObject_ReleaseBuffer(b, &vb);
-	return result;
-}
-
-static PyObject *
-string_repeat(register PyBytesObject *a, register Py_ssize_t n)
-{
-	register Py_ssize_t i;
-	register Py_ssize_t j;
-	register Py_ssize_t size;
-	register PyBytesObject *op;
-	size_t nbytes;
-	if (n < 0)
-		n = 0;
-	/* watch out for overflows:  the size can overflow int,
-	 * and the # of bytes needed can overflow size_t
-	 */
-	size = Py_SIZE(a) * n;
-	if (n && size / n != Py_SIZE(a)) {
-		PyErr_SetString(PyExc_OverflowError,
-			"repeated string is too long");
-		return NULL;
-	}
-	if (size == Py_SIZE(a) && PyBytes_CheckExact(a)) {
-		Py_INCREF(a);
-		return (PyObject *)a;
-	}
-	nbytes = (size_t)size;
-	if (nbytes + sizeof(PyBytesObject) <= nbytes) {
-		PyErr_SetString(PyExc_OverflowError,
-			"repeated string is too long");
-		return NULL;
-	}
-	op = (PyBytesObject *)
-		PyObject_MALLOC(sizeof(PyBytesObject) + nbytes);
-	if (op == NULL)
-		return PyErr_NoMemory();
-	PyObject_INIT_VAR(op, &PyBytes_Type, size);
-	op->ob_shash = -1;
-	op->ob_sval[size] = '\0';
-	if (Py_SIZE(a) == 1 && n > 0) {
-		memset(op->ob_sval, a->ob_sval[0] , n);
-		return (PyObject *) op;
-	}
-	i = 0;
-	if (i < size) {
-		Py_MEMCPY(op->ob_sval, a->ob_sval, Py_SIZE(a));
-		i = Py_SIZE(a);
-	}
-	while (i < size) {
-		j = (i <= size-i)  ?  i  :  size-i;
-		Py_MEMCPY(op->ob_sval+i, op->ob_sval, j);
-		i += j;
-	}
-	return (PyObject *) op;
-}
-
-static int
-string_contains(PyObject *self, PyObject *arg)
-{
-    Py_ssize_t ival = PyNumber_AsSsize_t(arg, PyExc_ValueError);
-    if (ival == -1 && PyErr_Occurred()) {
-        Py_buffer varg;
-        int pos;
-        PyErr_Clear();
-        if (_getbuffer(arg, &varg) < 0)
-            return -1;
-        pos = stringlib_find(PyBytes_AS_STRING(self), Py_SIZE(self),
-                             varg.buf, varg.len, 0);
-        PyObject_ReleaseBuffer(arg, &varg);
-        return pos >= 0;
-    }
-    if (ival < 0 || ival >= 256) {
-        PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
-        return -1;
-    }
-
-    return memchr(PyBytes_AS_STRING(self), ival, Py_SIZE(self)) != NULL;
-}
-
-static PyObject *
-string_item(PyBytesObject *a, register Py_ssize_t i)
-{
-	if (i < 0 || i >= Py_SIZE(a)) {
-		PyErr_SetString(PyExc_IndexError, "string index out of range");
-		return NULL;
-	}
-	return PyLong_FromLong((unsigned char)a->ob_sval[i]);
-}
-
-static PyObject*
-string_richcompare(PyBytesObject *a, PyBytesObject *b, int op)
-{
-	int c;
-	Py_ssize_t len_a, len_b;
-	Py_ssize_t min_len;
-	PyObject *result;
-
-	/* Make sure both arguments are strings. */
-	if (!(PyBytes_Check(a) && PyBytes_Check(b))) {
-		if (Py_BytesWarningFlag && (op == Py_EQ) &&
-		    (PyObject_IsInstance((PyObject*)a,
-					 (PyObject*)&PyUnicode_Type) ||
-		    PyObject_IsInstance((PyObject*)b,
-					 (PyObject*)&PyUnicode_Type))) {
-			if (PyErr_WarnEx(PyExc_BytesWarning,
-				    "Comparsion between bytes and string", 1))
-				return NULL;
-		}
-		result = Py_NotImplemented;
-		goto out;
-	}
-	if (a == b) {
-		switch (op) {
-		case Py_EQ:case Py_LE:case Py_GE:
-			result = Py_True;
-			goto out;
-		case Py_NE:case Py_LT:case Py_GT:
-			result = Py_False;
-			goto out;
-		}
-	}
-	if (op == Py_EQ) {
-		/* Supporting Py_NE here as well does not save
-		   much time, since Py_NE is rarely used.  */
-		if (Py_SIZE(a) == Py_SIZE(b)
-		    && (a->ob_sval[0] == b->ob_sval[0]
-			&& memcmp(a->ob_sval, b->ob_sval, Py_SIZE(a)) == 0)) {
-			result = Py_True;
-		} else {
-			result = Py_False;
-		}
-		goto out;
-	}
-	len_a = Py_SIZE(a); len_b = Py_SIZE(b);
-	min_len = (len_a < len_b) ? len_a : len_b;
-	if (min_len > 0) {
-		c = Py_CHARMASK(*a->ob_sval) - Py_CHARMASK(*b->ob_sval);
-		if (c==0)
-			c = memcmp(a->ob_sval, b->ob_sval, min_len);
-	} else
-		c = 0;
-	if (c == 0)
-		c = (len_a < len_b) ? -1 : (len_a > len_b) ? 1 : 0;
-	switch (op) {
-	case Py_LT: c = c <  0; break;
-	case Py_LE: c = c <= 0; break;
-	case Py_EQ: assert(0);  break; /* unreachable */
-	case Py_NE: c = c != 0; break;
-	case Py_GT: c = c >  0; break;
-	case Py_GE: c = c >= 0; break;
-	default:
-		result = Py_NotImplemented;
-		goto out;
-	}
-	result = c ? Py_True : Py_False;
-  out:
-	Py_INCREF(result);
-	return result;
-}
-
-static long
-string_hash(PyBytesObject *a)
-{
-	register Py_ssize_t len;
-	register unsigned char *p;
-	register long x;
-
-	if (a->ob_shash != -1)
-		return a->ob_shash;
-	len = Py_SIZE(a);
-	p = (unsigned char *) a->ob_sval;
-	x = *p << 7;
-	while (--len >= 0)
-		x = (1000003*x) ^ *p++;
-	x ^= Py_SIZE(a);
-	if (x == -1)
-		x = -2;
-	a->ob_shash = x;
-	return x;
-}
-
-static PyObject*
-string_subscript(PyBytesObject* self, PyObject* item)
-{
-	if (PyIndex_Check(item)) {
-		Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
-		if (i == -1 && PyErr_Occurred())
-			return NULL;
-		if (i < 0)
-			i += PyBytes_GET_SIZE(self);
-		if (i < 0 || i >= PyBytes_GET_SIZE(self)) {
-			PyErr_SetString(PyExc_IndexError,
-					"string index out of range");
-			return NULL;
-		}
-		return PyLong_FromLong((unsigned char)self->ob_sval[i]);
-	}
-	else if (PySlice_Check(item)) {
-		Py_ssize_t start, stop, step, slicelength, cur, i;
-		char* source_buf;
-		char* result_buf;
-		PyObject* result;
-
-		if (PySlice_GetIndicesEx((PySliceObject*)item,
-				 PyBytes_GET_SIZE(self),
-				 &start, &stop, &step, &slicelength) < 0) {
-			return NULL;
-		}
-
-		if (slicelength <= 0) {
-			return PyBytes_FromStringAndSize("", 0);
-		}
-		else if (start == 0 && step == 1 &&
-			 slicelength == PyBytes_GET_SIZE(self) &&
-			 PyBytes_CheckExact(self)) {
-			Py_INCREF(self);
-			return (PyObject *)self;
-		}
-		else if (step == 1) {
-			return PyBytes_FromStringAndSize(
-				PyBytes_AS_STRING(self) + start,
-				slicelength);
-		}
-		else {
-			source_buf = PyBytes_AsString((PyObject*)self);
-			result_buf = (char *)PyMem_Malloc(slicelength);
-			if (result_buf == NULL)
-				return PyErr_NoMemory();
-
-			for (cur = start, i = 0; i < slicelength;
-			     cur += step, i++) {
-				result_buf[i] = source_buf[cur];
-			}
-
-			result = PyBytes_FromStringAndSize(result_buf,
-							    slicelength);
-			PyMem_Free(result_buf);
-			return result;
-		}
-	}
-	else {
-		PyErr_Format(PyExc_TypeError,
-			     "string indices must be integers, not %.200s",
-			     Py_TYPE(item)->tp_name);
-		return NULL;
-	}
-}
-
-static int
-string_buffer_getbuffer(PyBytesObject *self, Py_buffer *view, int flags)
-{
-	return PyBuffer_FillInfo(view, (void *)self->ob_sval, Py_SIZE(self),
-				 0, flags);
-}
-
-static PySequenceMethods string_as_sequence = {
-	(lenfunc)string_length, /*sq_length*/
-	(binaryfunc)string_concat, /*sq_concat*/
-	(ssizeargfunc)string_repeat, /*sq_repeat*/
-	(ssizeargfunc)string_item, /*sq_item*/
-	0,		/*sq_slice*/
-	0,		/*sq_ass_item*/
-	0,		/*sq_ass_slice*/
-	(objobjproc)string_contains /*sq_contains*/
-};
-
-static PyMappingMethods string_as_mapping = {
-	(lenfunc)string_length,
-	(binaryfunc)string_subscript,
-	0,
-};
-
-static PyBufferProcs string_as_buffer = {
-	(getbufferproc)string_buffer_getbuffer,
-	NULL,
-};
-
-
-#define LEFTSTRIP 0
-#define RIGHTSTRIP 1
-#define BOTHSTRIP 2
-
-/* Arrays indexed by above */
-static const char *stripformat[] = {"|O:lstrip", "|O:rstrip", "|O:strip"};
-
-#define STRIPNAME(i) (stripformat[i]+3)
-
-
-/* Don't call if length < 2 */
-#define Py_STRING_MATCH(target, offset, pattern, length)	\
-  (target[offset] == pattern[0] &&				\
-   target[offset+length-1] == pattern[length-1] &&		\
-   !memcmp(target+offset+1, pattern+1, length-2) )
-
-
-/* Overallocate the initial list to reduce the number of reallocs for small
-   split sizes.  Eg, "A A A A A A A A A A".split() (10 elements) has three
-   resizes, to sizes 4, 8, then 16.  Most observed string splits are for human
-   text (roughly 11 words per line) and field delimited data (usually 1-10
-   fields).  For large strings the split algorithms are bandwidth limited
-   so increasing the preallocation likely will not improve things.*/
-
-#define MAX_PREALLOC 12
-
-/* 5 splits gives 6 elements */
-#define PREALLOC_SIZE(maxsplit) \
-	(maxsplit >= MAX_PREALLOC ? MAX_PREALLOC : maxsplit+1)
-
-#define SPLIT_ADD(data, left, right) {				\
-	str = PyBytes_FromStringAndSize((data) + (left),	\
-					 (right) - (left));	\
-	if (str == NULL)					\
-		goto onError;					\
-	if (count < MAX_PREALLOC) {				\
-		PyList_SET_ITEM(list, count, str);		\
-	} else {						\
-		if (PyList_Append(list, str)) {			\
-			Py_DECREF(str);				\
-			goto onError;				\
-		}						\
-		else						\
-			Py_DECREF(str);				\
-	}							\
-	count++; }
-
-/* Always force the list to the expected size. */
-#define FIX_PREALLOC_SIZE(list) Py_SIZE(list) = count
-
-#define SKIP_SPACE(s, i, len)    { while (i<len &&  ISSPACE(s[i])) i++; }
-#define SKIP_NONSPACE(s, i, len) { while (i<len && !ISSPACE(s[i])) i++; }
-#define RSKIP_SPACE(s, i)        { while (i>=0  &&  ISSPACE(s[i])) i--; }
-#define RSKIP_NONSPACE(s, i)     { while (i>=0  && !ISSPACE(s[i])) i--; }
-
-Py_LOCAL_INLINE(PyObject *)
-split_whitespace(PyBytesObject *self, Py_ssize_t len, Py_ssize_t maxsplit)
-{
-	const char *s = PyBytes_AS_STRING(self);
-	Py_ssize_t i, j, count=0;
-	PyObject *str;
-	PyObject *list = PyList_New(PREALLOC_SIZE(maxsplit));
-
-	if (list == NULL)
-		return NULL;
-
-	i = j = 0;
-
-	while (maxsplit-- > 0) {
-		SKIP_SPACE(s, i, len);
-		if (i==len) break;
-		j = i; i++;
-		SKIP_NONSPACE(s, i, len);
-		if (j == 0 && i == len && PyBytes_CheckExact(self)) {
-			/* No whitespace in self, so just use it as list[0] */
-			Py_INCREF(self);
-			PyList_SET_ITEM(list, 0, (PyObject *)self);
-			count++;
-			break;
-		}
-		SPLIT_ADD(s, j, i);
-	}
-
-	if (i < len) {
-		/* Only occurs when maxsplit was reached */
-		/* Skip any remaining whitespace and copy to end of string */
-		SKIP_SPACE(s, i, len);
-		if (i != len)
-			SPLIT_ADD(s, i, len);
-	}
-	FIX_PREALLOC_SIZE(list);
-	return list;
-  onError:
-	Py_DECREF(list);
-	return NULL;
-}
-
-Py_LOCAL_INLINE(PyObject *)
-split_char(PyBytesObject *self, Py_ssize_t len, char ch, Py_ssize_t maxcount)
-{
-	const char *s = PyBytes_AS_STRING(self);
-	register Py_ssize_t i, j, count=0;
-	PyObject *str;
-	PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
-
-	if (list == NULL)
-		return NULL;
-
-	i = j = 0;
-	while ((j < len) && (maxcount-- > 0)) {
-		for(; j<len; j++) {
-			/* I found that using memchr makes no difference */
-			if (s[j] == ch) {
-				SPLIT_ADD(s, i, j);
-				i = j = j + 1;
-				break;
-			}
-		}
-	}
-	if (i == 0 && count == 0 && PyBytes_CheckExact(self)) {
-		/* ch not in self, so just use self as list[0] */
-		Py_INCREF(self);
-		PyList_SET_ITEM(list, 0, (PyObject *)self);
-		count++;
-	}
-	else if (i <= len) {
-		SPLIT_ADD(s, i, len);
-	}
-	FIX_PREALLOC_SIZE(list);
-	return list;
-
-  onError:
-	Py_DECREF(list);
-	return NULL;
-}
-
-PyDoc_STRVAR(split__doc__,
-"B.split([sep[, maxsplit]]) -> list of bytes\n\
-\n\
-Return a list of the sections in B, using sep as the delimiter.\n\
-If sep is not specified or is None, B is split on ASCII whitespace\n\
-characters (space, tab, return, newline, formfeed, vertical tab).\n\
-If maxsplit is given, at most maxsplit splits are done.");
-
-static PyObject *
-string_split(PyBytesObject *self, PyObject *args)
-{
-	Py_ssize_t len = PyBytes_GET_SIZE(self), n, i, j;
-	Py_ssize_t maxsplit = -1, count=0;
-	const char *s = PyBytes_AS_STRING(self), *sub;
-	Py_buffer vsub;
-	PyObject *list, *str, *subobj = Py_None;
-#ifdef USE_FAST
-	Py_ssize_t pos;
-#endif
-
-	if (!PyArg_ParseTuple(args, "|On:split", &subobj, &maxsplit))
-		return NULL;
-	if (maxsplit < 0)
-		maxsplit = PY_SSIZE_T_MAX;
-	if (subobj == Py_None)
-		return split_whitespace(self, len, maxsplit);
-	if (_getbuffer(subobj, &vsub) < 0)
-		return NULL;
-	sub = vsub.buf;
-	n = vsub.len;
-
-	if (n == 0) {
-		PyErr_SetString(PyExc_ValueError, "empty separator");
-		PyObject_ReleaseBuffer(subobj, &vsub);
-		return NULL;
-	}
-	else if (n == 1)
-		return split_char(self, len, sub[0], maxsplit);
-
-	list = PyList_New(PREALLOC_SIZE(maxsplit));
-	if (list == NULL) {
-		PyObject_ReleaseBuffer(subobj, &vsub);
-		return NULL;
-	}
-
-#ifdef USE_FAST
-	i = j = 0;
-	while (maxsplit-- > 0) {
-		pos = fastsearch(s+i, len-i, sub, n, FAST_SEARCH);
-		if (pos < 0)
-			break;
-		j = i+pos;
-		SPLIT_ADD(s, i, j);
-		i = j + n;
-	}
-#else
-	i = j = 0;
-	while ((j+n <= len) && (maxsplit-- > 0)) {
-		for (; j+n <= len; j++) {
-			if (Py_STRING_MATCH(s, j, sub, n)) {
-				SPLIT_ADD(s, i, j);
-				i = j = j + n;
-				break;
-			}
-		}
-	}
-#endif
-	SPLIT_ADD(s, i, len);
-	FIX_PREALLOC_SIZE(list);
-	PyObject_ReleaseBuffer(subobj, &vsub);
-	return list;
-
- onError:
-	Py_DECREF(list);
-	PyObject_ReleaseBuffer(subobj, &vsub);
-	return NULL;
-}
-
-PyDoc_STRVAR(partition__doc__,
-"B.partition(sep) -> (head, sep, tail)\n\
-\n\
-Searches for the separator sep in B, and returns the part before it,\n\
-the separator itself, and the part after it.  If the separator is not\n\
-found, returns B and two empty bytes objects.");
-
-static PyObject *
-string_partition(PyBytesObject *self, PyObject *sep_obj)
-{
-	const char *sep;
-	Py_ssize_t sep_len;
-
-	if (PyBytes_Check(sep_obj)) {
-		sep = PyBytes_AS_STRING(sep_obj);
-		sep_len = PyBytes_GET_SIZE(sep_obj);
-	}
-	else if (PyObject_AsCharBuffer(sep_obj, &sep, &sep_len))
-		return NULL;
-
-	return stringlib_partition(
-		(PyObject*) self,
-		PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self),
-		sep_obj, sep, sep_len
-		);
-}
-
-PyDoc_STRVAR(rpartition__doc__,
-"B.rpartition(sep) -> (tail, sep, head)\n\
-\n\
-Searches for the separator sep in B, starting at the end of B,\n\
-and returns the part before it, the separator itself, and the\n\
-part after it.  If the separator is not found, returns two empty\n\
-bytes objects and B.");
-
-static PyObject *
-string_rpartition(PyBytesObject *self, PyObject *sep_obj)
-{
-	const char *sep;
-	Py_ssize_t sep_len;
-
-	if (PyBytes_Check(sep_obj)) {
-		sep = PyBytes_AS_STRING(sep_obj);
-		sep_len = PyBytes_GET_SIZE(sep_obj);
-	}
-	else if (PyObject_AsCharBuffer(sep_obj, &sep, &sep_len))
-		return NULL;
-
-	return stringlib_rpartition(
-		(PyObject*) self,
-		PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self),
-		sep_obj, sep, sep_len
-		);
-}
-
-Py_LOCAL_INLINE(PyObject *)
-rsplit_whitespace(PyBytesObject *self, Py_ssize_t len, Py_ssize_t maxsplit)
-{
-	const char *s = PyBytes_AS_STRING(self);
-	Py_ssize_t i, j, count=0;
-	PyObject *str;
-	PyObject *list = PyList_New(PREALLOC_SIZE(maxsplit));
-
-	if (list == NULL)
-		return NULL;
-
-	i = j = len-1;
-
-	while (maxsplit-- > 0) {
-		RSKIP_SPACE(s, i);
-		if (i<0) break;
-		j = i; i--;
-		RSKIP_NONSPACE(s, i);
-		if (j == len-1 && i < 0 && PyBytes_CheckExact(self)) {
-			/* No whitespace in self, so just use it as list[0] */
-			Py_INCREF(self);
-			PyList_SET_ITEM(list, 0, (PyObject *)self);
-			count++;
-			break;
-		}
-		SPLIT_ADD(s, i + 1, j + 1);
-	}
-	if (i >= 0) {
-		/* Only occurs when maxsplit was reached.  Skip any remaining
-		   whitespace and copy to beginning of string. */
-		RSKIP_SPACE(s, i);
-		if (i >= 0)
-			SPLIT_ADD(s, 0, i + 1);
-
-	}
-	FIX_PREALLOC_SIZE(list);
-	if (PyList_Reverse(list) < 0)
-		goto onError;
-	return list;
-  onError:
-	Py_DECREF(list);
-	return NULL;
-}
-
-Py_LOCAL_INLINE(PyObject *)
-rsplit_char(PyBytesObject *self, Py_ssize_t len, char ch, Py_ssize_t maxcount)
-{
-	const char *s = PyBytes_AS_STRING(self);
-	register Py_ssize_t i, j, count=0;
-	PyObject *str;
-	PyObject *list = PyList_New(PREALLOC_SIZE(maxcount));
-
-	if (list == NULL)
-		return NULL;
-
-	i = j = len - 1;
-	while ((i >= 0) && (maxcount-- > 0)) {
-		for (; i >= 0; i--) {
-			if (s[i] == ch) {
-				SPLIT_ADD(s, i + 1, j + 1);
-				j = i = i - 1;
-				break;
-			}
-		}
-	}
-	if (i < 0 && count == 0 && PyBytes_CheckExact(self)) {
-		/* ch not in self, so just use self as list[0] */
-		Py_INCREF(self);
-		PyList_SET_ITEM(list, 0, (PyObject *)self);
-		count++;
-	}
-	else if (j >= -1) {
-		SPLIT_ADD(s, 0, j + 1);
-	}
-	FIX_PREALLOC_SIZE(list);
-	if (PyList_Reverse(list) < 0)
-		goto onError;
-	return list;
-
- onError:
-	Py_DECREF(list);
-	return NULL;
-}
-
-PyDoc_STRVAR(rsplit__doc__,
-"B.rsplit([sep[, maxsplit]]) -> list of strings\n\
-\n\
-Return a list of the sections in B, using sep as the delimiter,\n\
-starting at the end of B and working to the front.\n\
-If sep is not given, B is split on ASCII whitespace characters\n\
-(space, tab, return, newline, formfeed, vertical tab).\n\
-If maxsplit is given, at most maxsplit splits are done.");
-
-
-static PyObject *
-string_rsplit(PyBytesObject *self, PyObject *args)
-{
-	Py_ssize_t len = PyBytes_GET_SIZE(self), n, i, j;
-	Py_ssize_t maxsplit = -1, count=0;
-	const char *s, *sub;
-	Py_buffer vsub;
-	PyObject *list, *str, *subobj = Py_None;
-
-	if (!PyArg_ParseTuple(args, "|On:rsplit", &subobj, &maxsplit))
-		return NULL;
-	if (maxsplit < 0)
-		maxsplit = PY_SSIZE_T_MAX;
-	if (subobj == Py_None)
-		return rsplit_whitespace(self, len, maxsplit);
-	if (_getbuffer(subobj, &vsub) < 0)
-		return NULL;
-	sub = vsub.buf;
-	n = vsub.len;
-
-	if (n == 0) {
-		PyErr_SetString(PyExc_ValueError, "empty separator");
-		PyObject_ReleaseBuffer(subobj, &vsub);
-		return NULL;
-	}
-	else if (n == 1)
-		return rsplit_char(self, len, sub[0], maxsplit);
-
-	list = PyList_New(PREALLOC_SIZE(maxsplit));
-	if (list == NULL) {
-		PyObject_ReleaseBuffer(subobj, &vsub);
-		return NULL;
-	}
-
-	j = len;
-	i = j - n;
-
-	s = PyBytes_AS_STRING(self);
-	while ( (i >= 0) && (maxsplit-- > 0) ) {
-		for (; i>=0; i--) {
-			if (Py_STRING_MATCH(s, i, sub, n)) {
-				SPLIT_ADD(s, i + n, j);
-				j = i;
-				i -= n;
-				break;
-			}
-		}
-	}
-	SPLIT_ADD(s, 0, j);
-	FIX_PREALLOC_SIZE(list);
-	if (PyList_Reverse(list) < 0)
-		goto onError;
-	PyObject_ReleaseBuffer(subobj, &vsub);
-	return list;
-
-onError:
-	Py_DECREF(list);
-	PyObject_ReleaseBuffer(subobj, &vsub);
-	return NULL;
-}
-
-#undef SPLIT_ADD
-#undef MAX_PREALLOC
-#undef PREALLOC_SIZE
-
-
-PyDoc_STRVAR(join__doc__,
-"B.join(iterable_of_bytes) -> bytes\n\
-\n\
-Concatenates any number of bytes objects, with B in between each pair.\n\
-Example: b'.'.join([b'ab', b'pq', b'rs']) -> b'ab.pq.rs'.");
-
-static PyObject *
-string_join(PyObject *self, PyObject *orig)
-{
-	char *sep = PyBytes_AS_STRING(self);
-	const Py_ssize_t seplen = PyBytes_GET_SIZE(self);
-	PyObject *res = NULL;
-	char *p;
-	Py_ssize_t seqlen = 0;
-	size_t sz = 0;
-	Py_ssize_t i;
-	PyObject *seq, *item;
-
-	seq = PySequence_Fast(orig, "");
-	if (seq == NULL) {
-		return NULL;
-	}
-
-	seqlen = PySequence_Size(seq);
-	if (seqlen == 0) {
-		Py_DECREF(seq);
-		return PyBytes_FromString("");
-	}
-	if (seqlen == 1) {
-		item = PySequence_Fast_GET_ITEM(seq, 0);
-		if (PyBytes_CheckExact(item)) {
-			Py_INCREF(item);
-			Py_DECREF(seq);
-			return item;
-		}
-	}
-
-	/* There are at least two things to join, or else we have a subclass
-	 * of the builtin types in the sequence.
-	 * Do a pre-pass to figure out the total amount of space we'll
-	 * need (sz), and see whether all argument are bytes.
-	 */
-	/* XXX Shouldn't we use _getbuffer() on these items instead? */
-	for (i = 0; i < seqlen; i++) {
-		const size_t old_sz = sz;
-		item = PySequence_Fast_GET_ITEM(seq, i);
-		if (!PyBytes_Check(item) && !PyByteArray_Check(item)) {
-			PyErr_Format(PyExc_TypeError,
-				     "sequence item %zd: expected bytes,"
-				     " %.80s found",
-				     i, Py_TYPE(item)->tp_name);
-			Py_DECREF(seq);
-			return NULL;
-		}
-		sz += Py_SIZE(item);
-		if (i != 0)
-			sz += seplen;
-		if (sz < old_sz || sz > PY_SSIZE_T_MAX) {
-			PyErr_SetString(PyExc_OverflowError,
-			    "join() result is too long for a Python string");
-			Py_DECREF(seq);
-			return NULL;
-		}
-	}
-
-	/* Allocate result space. */
-	res = PyBytes_FromStringAndSize((char*)NULL, sz);
-	if (res == NULL) {
-		Py_DECREF(seq);
-		return NULL;
-	}
-
-	/* Catenate everything. */
-	/* I'm not worried about a PyByteArray item growing because there's
-	   nowhere in this function where we release the GIL. */
-	p = PyBytes_AS_STRING(res);
-	for (i = 0; i < seqlen; ++i) {
-		size_t n;
-                char *q;
-		if (i) {
-			Py_MEMCPY(p, sep, seplen);
-			p += seplen;
-		}
-		item = PySequence_Fast_GET_ITEM(seq, i);
-		n = Py_SIZE(item);
-                if (PyBytes_Check(item))
-			q = PyBytes_AS_STRING(item);
-		else
-			q = PyByteArray_AS_STRING(item);
-		Py_MEMCPY(p, q, n);
-		p += n;
-	}
-
-	Py_DECREF(seq);
-	return res;
-}
-
-PyObject *
-_PyBytes_Join(PyObject *sep, PyObject *x)
-{
-	assert(sep != NULL && PyBytes_Check(sep));
-	assert(x != NULL);
-	return string_join(sep, x);
-}
-
-Py_LOCAL_INLINE(void)
-string_adjust_indices(Py_ssize_t *start, Py_ssize_t *end, Py_ssize_t len)
-{
-	if (*end > len)
-		*end = len;
-	else if (*end < 0)
-		*end += len;
-	if (*end < 0)
-		*end = 0;
-	if (*start < 0)
-		*start += len;
-	if (*start < 0)
-		*start = 0;
-}
-
-Py_LOCAL_INLINE(Py_ssize_t)
-string_find_internal(PyBytesObject *self, PyObject *args, int dir)
-{
-	PyObject *subobj;
-	const char *sub;
-	Py_ssize_t sub_len;
-	Py_ssize_t start=0, end=PY_SSIZE_T_MAX;
-	PyObject *obj_start=Py_None, *obj_end=Py_None;
-
-	if (!PyArg_ParseTuple(args, "O|OO:find/rfind/index/rindex", &subobj,
-		&obj_start, &obj_end))
-		return -2;
-	/* To support None in "start" and "end" arguments, meaning
-	   the same as if they were not passed.
-	*/
-	if (obj_start != Py_None)
-		if (!_PyEval_SliceIndex(obj_start, &start))
-	        return -2;
-	if (obj_end != Py_None)
-		if (!_PyEval_SliceIndex(obj_end, &end))
-	        return -2;
-
-	if (PyBytes_Check(subobj)) {
-		sub = PyBytes_AS_STRING(subobj);
-		sub_len = PyBytes_GET_SIZE(subobj);
-	}
-	else if (PyObject_AsCharBuffer(subobj, &sub, &sub_len))
-		/* XXX - the "expected a character buffer object" is pretty
-		   confusing for a non-expert.  remap to something else ? */
-		return -2;
-
-	if (dir > 0)
-		return stringlib_find_slice(
-			PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self),
-			sub, sub_len, start, end);
-	else
-		return stringlib_rfind_slice(
-			PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self),
-			sub, sub_len, start, end);
-}
-
-
-PyDoc_STRVAR(find__doc__,
-"B.find(sub [,start [,end]]) -> int\n\
-\n\
-Return the lowest index in S where substring sub is found,\n\
-such that sub is contained within s[start:end].  Optional\n\
-arguments start and end are interpreted as in slice notation.\n\
-\n\
-Return -1 on failure.");
-
-static PyObject *
-string_find(PyBytesObject *self, PyObject *args)
-{
-	Py_ssize_t result = string_find_internal(self, args, +1);
-	if (result == -2)
-		return NULL;
-	return PyLong_FromSsize_t(result);
-}
-
-
-PyDoc_STRVAR(index__doc__,
-"B.index(sub [,start [,end]]) -> int\n\
-\n\
-Like B.find() but raise ValueError when the substring is not found.");
-
-static PyObject *
-string_index(PyBytesObject *self, PyObject *args)
-{
-	Py_ssize_t result = string_find_internal(self, args, +1);
-	if (result == -2)
-		return NULL;
-	if (result == -1) {
-		PyErr_SetString(PyExc_ValueError,
-				"substring not found");
-		return NULL;
-	}
-	return PyLong_FromSsize_t(result);
-}
-
-
-PyDoc_STRVAR(rfind__doc__,
-"B.rfind(sub [,start [,end]]) -> int\n\
-\n\
-Return the highest index in B where substring sub is found,\n\
-such that sub is contained within s[start:end].  Optional\n\
-arguments start and end are interpreted as in slice notation.\n\
-\n\
-Return -1 on failure.");
-
-static PyObject *
-string_rfind(PyBytesObject *self, PyObject *args)
-{
-	Py_ssize_t result = string_find_internal(self, args, -1);
-	if (result == -2)
-		return NULL;
-	return PyLong_FromSsize_t(result);
-}
-
-
-PyDoc_STRVAR(rindex__doc__,
-"B.rindex(sub [,start [,end]]) -> int\n\
-\n\
-Like B.rfind() but raise ValueError when the substring is not found.");
-
-static PyObject *
-string_rindex(PyBytesObject *self, PyObject *args)
-{
-	Py_ssize_t result = string_find_internal(self, args, -1);
-	if (result == -2)
-		return NULL;
-	if (result == -1) {
-		PyErr_SetString(PyExc_ValueError,
-				"substring not found");
-		return NULL;
-	}
-	return PyLong_FromSsize_t(result);
-}
-
-
-Py_LOCAL_INLINE(PyObject *)
-do_xstrip(PyBytesObject *self, int striptype, PyObject *sepobj)
-{
-	Py_buffer vsep;
-	char *s = PyBytes_AS_STRING(self);
-	Py_ssize_t len = PyBytes_GET_SIZE(self);
-	char *sep;
-	Py_ssize_t seplen;
-	Py_ssize_t i, j;
-
-	if (_getbuffer(sepobj, &vsep) < 0)
-		return NULL;
-	sep = vsep.buf;
-	seplen = vsep.len;
-
-	i = 0;
-	if (striptype != RIGHTSTRIP) {
-		while (i < len && memchr(sep, Py_CHARMASK(s[i]), seplen)) {
-			i++;
-		}
-	}
-
-	j = len;
-	if (striptype != LEFTSTRIP) {
-		do {
-			j--;
-		} while (j >= i && memchr(sep, Py_CHARMASK(s[j]), seplen));
-		j++;
-	}
-
-	PyObject_ReleaseBuffer(sepobj, &vsep);
-
-	if (i == 0 && j == len && PyBytes_CheckExact(self)) {
-		Py_INCREF(self);
-		return (PyObject*)self;
-	}
-	else
-		return PyBytes_FromStringAndSize(s+i, j-i);
-}
-
-
-Py_LOCAL_INLINE(PyObject *)
-do_strip(PyBytesObject *self, int striptype)
-{
-	char *s = PyBytes_AS_STRING(self);
-	Py_ssize_t len = PyBytes_GET_SIZE(self), i, j;
-
-	i = 0;
-	if (striptype != RIGHTSTRIP) {
-		while (i < len && ISSPACE(s[i])) {
-			i++;
-		}
-	}
-
-	j = len;
-	if (striptype != LEFTSTRIP) {
-		do {
-			j--;
-		} while (j >= i && ISSPACE(s[j]));
-		j++;
-	}
-
-	if (i == 0 && j == len && PyBytes_CheckExact(self)) {
-		Py_INCREF(self);
-		return (PyObject*)self;
-	}
-	else
-		return PyBytes_FromStringAndSize(s+i, j-i);
-}
-
-
-Py_LOCAL_INLINE(PyObject *)
-do_argstrip(PyBytesObject *self, int striptype, PyObject *args)
-{
-	PyObject *sep = NULL;
-
-	if (!PyArg_ParseTuple(args, (char *)stripformat[striptype], &sep))
-		return NULL;
-
-	if (sep != NULL && sep != Py_None) {
-		return do_xstrip(self, striptype, sep);
-	}
-	return do_strip(self, striptype);
-}
-
-
-PyDoc_STRVAR(strip__doc__,
-"B.strip([bytes]) -> bytes\n\
-\n\
-Strip leading and trailing bytes contained in the argument.\n\
-If the argument is omitted, strip trailing ASCII whitespace.");
-static PyObject *
-string_strip(PyBytesObject *self, PyObject *args)
-{
-	if (PyTuple_GET_SIZE(args) == 0)
-		return do_strip(self, BOTHSTRIP); /* Common case */
-	else
-		return do_argstrip(self, BOTHSTRIP, args);
-}
-
-
-PyDoc_STRVAR(lstrip__doc__,
-"B.lstrip([bytes]) -> bytes\n\
-\n\
-Strip leading bytes contained in the argument.\n\
-If the argument is omitted, strip leading ASCII whitespace.");
-static PyObject *
-string_lstrip(PyBytesObject *self, PyObject *args)
-{
-	if (PyTuple_GET_SIZE(args) == 0)
-		return do_strip(self, LEFTSTRIP); /* Common case */
-	else
-		return do_argstrip(self, LEFTSTRIP, args);
-}
-
-
-PyDoc_STRVAR(rstrip__doc__,
-"B.rstrip([bytes]) -> bytes\n\
-\n\
-Strip trailing bytes contained in the argument.\n\
-If the argument is omitted, strip trailing ASCII whitespace.");
-static PyObject *
-string_rstrip(PyBytesObject *self, PyObject *args)
-{
-	if (PyTuple_GET_SIZE(args) == 0)
-		return do_strip(self, RIGHTSTRIP); /* Common case */
-	else
-		return do_argstrip(self, RIGHTSTRIP, args);
-}
-
-
-PyDoc_STRVAR(count__doc__,
-"B.count(sub [,start [,end]]) -> int\n\
-\n\
-Return the number of non-overlapping occurrences of substring sub in\n\
-string S[start:end].  Optional arguments start and end are interpreted\n\
-as in slice notation.");
-
-static PyObject *
-string_count(PyBytesObject *self, PyObject *args)
-{
-	PyObject *sub_obj;
-	const char *str = PyBytes_AS_STRING(self), *sub;
-	Py_ssize_t sub_len;
-	Py_ssize_t start = 0, end = PY_SSIZE_T_MAX;
-
-	if (!PyArg_ParseTuple(args, "O|O&O&:count", &sub_obj,
-		_PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
-		return NULL;
-
-	if (PyBytes_Check(sub_obj)) {
-		sub = PyBytes_AS_STRING(sub_obj);
-		sub_len = PyBytes_GET_SIZE(sub_obj);
-	}
-	else if (PyObject_AsCharBuffer(sub_obj, &sub, &sub_len))
-		return NULL;
-
-	string_adjust_indices(&start, &end, PyBytes_GET_SIZE(self));
-
-	return PyLong_FromSsize_t(
-		stringlib_count(str + start, end - start, sub, sub_len)
-		);
-}
-
-
-PyDoc_STRVAR(translate__doc__,
-"B.translate(table[, deletechars]) -> bytes\n\
-\n\
-Return a copy of B, where all characters occurring in the\n\
-optional argument deletechars are removed, and the remaining\n\
-characters have been mapped through the given translation\n\
-table, which must be a bytes object of length 256.");
-
-static PyObject *
-string_translate(PyBytesObject *self, PyObject *args)
-{
-	register char *input, *output;
-	const char *table;
-	register Py_ssize_t i, c, changed = 0;
-	PyObject *input_obj = (PyObject*)self;
-	const char *output_start, *del_table=NULL;
-	Py_ssize_t inlen, tablen, dellen = 0;
-	PyObject *result;
-	int trans_table[256];
-	PyObject *tableobj, *delobj = NULL;
-
-	if (!PyArg_UnpackTuple(args, "translate", 1, 2,
-			      &tableobj, &delobj))
-		return NULL;
-
-	if (PyBytes_Check(tableobj)) {
-		table = PyBytes_AS_STRING(tableobj);
-		tablen = PyBytes_GET_SIZE(tableobj);
-	}
-	else if (tableobj == Py_None) {
-		table = NULL;
-		tablen = 256;
-	}
-	else if (PyObject_AsCharBuffer(tableobj, &table, &tablen))
-		return NULL;
-
-	if (tablen != 256) {
-		PyErr_SetString(PyExc_ValueError,
-		  "translation table must be 256 characters long");
-		return NULL;
-	}
-
-	if (delobj != NULL) {
-		if (PyBytes_Check(delobj)) {
-			del_table = PyBytes_AS_STRING(delobj);
-			dellen = PyBytes_GET_SIZE(delobj);
-		}
-		else if (PyUnicode_Check(delobj)) {
-			PyErr_SetString(PyExc_TypeError,
-			"deletions are implemented differently for unicode");
-			return NULL;
-		}
-		else if (PyObject_AsCharBuffer(delobj, &del_table, &dellen))
-			return NULL;
-	}
-	else {
-		del_table = NULL;
-		dellen = 0;
-	}
-
-	inlen = PyBytes_GET_SIZE(input_obj);
-	result = PyBytes_FromStringAndSize((char *)NULL, inlen);
-	if (result == NULL)
-		return NULL;
-	output_start = output = PyBytes_AsString(result);
-	input = PyBytes_AS_STRING(input_obj);
-
-	if (dellen == 0 && table != NULL) {
-		/* If no deletions are required, use faster code */
-		for (i = inlen; --i >= 0; ) {
-			c = Py_CHARMASK(*input++);
-			if (Py_CHARMASK((*output++ = table[c])) != c)
-				changed = 1;
-		}
-		if (changed || !PyBytes_CheckExact(input_obj))
-			return result;
-		Py_DECREF(result);
-		Py_INCREF(input_obj);
-		return input_obj;
-	}
-
-	if (table == NULL) {
-		for (i = 0; i < 256; i++)
-			trans_table[i] = Py_CHARMASK(i);
-	} else {
-		for (i = 0; i < 256; i++)
-			trans_table[i] = Py_CHARMASK(table[i]);
-	}
-
-	for (i = 0; i < dellen; i++)
-		trans_table[(int) Py_CHARMASK(del_table[i])] = -1;
-
-	for (i = inlen; --i >= 0; ) {
-		c = Py_CHARMASK(*input++);
-		if (trans_table[c] != -1)
-			if (Py_CHARMASK(*output++ = (char)trans_table[c]) == c)
-				continue;
-		changed = 1;
-	}
-	if (!changed && PyBytes_CheckExact(input_obj)) {
-		Py_DECREF(result);
-		Py_INCREF(input_obj);
-		return input_obj;
-	}
-	/* Fix the size of the resulting string */
-	if (inlen > 0)
-		_PyBytes_Resize(&result, output - output_start);
-	return result;
-}
-
-
-#define FORWARD 1
-#define REVERSE -1
-
-/* find and count characters and substrings */
-
-#define findchar(target, target_len, c)				\
-  ((char *)memchr((const void *)(target), c, target_len))
-
-/* String ops must return a string.  */
-/* If the object is subclass of string, create a copy */
-Py_LOCAL(PyBytesObject *)
-return_self(PyBytesObject *self)
-{
-	if (PyBytes_CheckExact(self)) {
-		Py_INCREF(self);
-		return self;
-	}
-	return (PyBytesObject *)PyBytes_FromStringAndSize(
-		PyBytes_AS_STRING(self),
-		PyBytes_GET_SIZE(self));
-}
-
-Py_LOCAL_INLINE(Py_ssize_t)
-countchar(const char *target, int target_len, char c, Py_ssize_t maxcount)
-{
-	Py_ssize_t count=0;
-	const char *start=target;
-	const char *end=target+target_len;
-
-	while ( (start=findchar(start, end-start, c)) != NULL ) {
-		count++;
-		if (count >= maxcount)
-			break;
-		start += 1;
-	}
-	return count;
-}
-
-Py_LOCAL(Py_ssize_t)
-findstring(const char *target, Py_ssize_t target_len,
-	   const char *pattern, Py_ssize_t pattern_len,
-	   Py_ssize_t start,
-	   Py_ssize_t end,
-	   int direction)
-{
-	if (start < 0) {
-		start += target_len;
-		if (start < 0)
-			start = 0;
-	}
-	if (end > target_len) {
-		end = target_len;
-	} else if (end < 0) {
-		end += target_len;
-		if (end < 0)
-			end = 0;
-	}
-
-	/* zero-length substrings always match at the first attempt */
-	if (pattern_len == 0)
-		return (direction > 0) ? start : end;
-
-	end -= pattern_len;
-
-	if (direction < 0) {
-		for (; end >= start; end--)
-			if (Py_STRING_MATCH(target, end, pattern, pattern_len))
-				return end;
-	} else {
-		for (; start <= end; start++)
-			if (Py_STRING_MATCH(target, start,pattern,pattern_len))
-				return start;
-	}
-	return -1;
-}
-
-Py_LOCAL_INLINE(Py_ssize_t)
-countstring(const char *target, Py_ssize_t target_len,
-	    const char *pattern, Py_ssize_t pattern_len,
-	    Py_ssize_t start,
-	    Py_ssize_t end,
-	    int direction, Py_ssize_t maxcount)
-{
-	Py_ssize_t count=0;
-
-	if (start < 0) {
-		start += target_len;
-		if (start < 0)
-			start = 0;
-	}
-	if (end > target_len) {
-		end = target_len;
-	} else if (end < 0) {
-		end += target_len;
-		if (end < 0)
-			end = 0;
-	}
-
-	/* zero-length substrings match everywhere */
-	if (pattern_len == 0 || maxcount == 0) {
-		if (target_len+1 < maxcount)
-			return target_len+1;
-		return maxcount;
-	}
-
-	end -= pattern_len;
-	if (direction < 0) {
-		for (; (end >= start); end--)
-			if (Py_STRING_MATCH(target, end,pattern,pattern_len)) {
-				count++;
-				if (--maxcount <= 0) break;
-				end -= pattern_len-1;
-			}
-	} else {
-		for (; (start <= end); start++)
-			if (Py_STRING_MATCH(target, start,
-					    pattern, pattern_len)) {
-				count++;
-				if (--maxcount <= 0)
-					break;
-				start += pattern_len-1;
-			}
-	}
-	return count;
-}
-
-
-/* Algorithms for different cases of string replacement */
-
-/* len(self)>=1, from="", len(to)>=1, maxcount>=1 */
-Py_LOCAL(PyBytesObject *)
-replace_interleave(PyBytesObject *self,
-		   const char *to_s, Py_ssize_t to_len,
-		   Py_ssize_t maxcount)
-{
-	char *self_s, *result_s;
-	Py_ssize_t self_len, result_len;
-	Py_ssize_t count, i, product;
-	PyBytesObject *result;
-
-	self_len = PyBytes_GET_SIZE(self);
-
-	/* 1 at the end plus 1 after every character */
-	count = self_len+1;
-	if (maxcount < count)
-		count = maxcount;
-
-	/* Check for overflow */
-	/*   result_len = count * to_len + self_len; */
-	product = count * to_len;
-	if (product / to_len != count) {
-		PyErr_SetString(PyExc_OverflowError,
-				"replace string is too long");
-		return NULL;
-	}
-	result_len = product + self_len;
-	if (result_len < 0) {
-		PyErr_SetString(PyExc_OverflowError,
-				"replace string is too long");
-		return NULL;
-	}
-
-	if (! (result = (PyBytesObject *)
-	                 PyBytes_FromStringAndSize(NULL, result_len)) )
-		return NULL;
-
-	self_s = PyBytes_AS_STRING(self);
-	result_s = PyBytes_AS_STRING(result);
-
-	/* TODO: special case single character, which doesn't need memcpy */
-
-	/* Lay the first one down (guaranteed this will occur) */
-	Py_MEMCPY(result_s, to_s, to_len);
-	result_s += to_len;
-	count -= 1;
-
-	for (i=0; i<count; i++) {
-		*result_s++ = *self_s++;
-		Py_MEMCPY(result_s, to_s, to_len);
-		result_s += to_len;
-	}
-
-	/* Copy the rest of the original string */
-	Py_MEMCPY(result_s, self_s, self_len-i);
-
-	return result;
-}
-
-/* Special case for deleting a single character */
-/* len(self)>=1, len(from)==1, to="", maxcount>=1 */
-Py_LOCAL(PyBytesObject *)
-replace_delete_single_character(PyBytesObject *self,
-				char from_c, Py_ssize_t maxcount)
-{
-	char *self_s, *result_s;
-	char *start, *next, *end;
-	Py_ssize_t self_len, result_len;
-	Py_ssize_t count;
-	PyBytesObject *result;
-
-	self_len = PyBytes_GET_SIZE(self);
-	self_s = PyBytes_AS_STRING(self);
-
-	count = countchar(self_s, self_len, from_c, maxcount);
-	if (count == 0) {
-		return return_self(self);
-	}
-
-	result_len = self_len - count;  /* from_len == 1 */
-	assert(result_len>=0);
-
-	if ( (result = (PyBytesObject *)
-	                PyBytes_FromStringAndSize(NULL, result_len)) == NULL)
-		return NULL;
-	result_s = PyBytes_AS_STRING(result);
-
-	start = self_s;
-	end = self_s + self_len;
-	while (count-- > 0) {
-		next = findchar(start, end-start, from_c);
-		if (next == NULL)
-			break;
-		Py_MEMCPY(result_s, start, next-start);
-		result_s += (next-start);
-		start = next+1;
-	}
-	Py_MEMCPY(result_s, start, end-start);
-
-	return result;
-}
-
-/* len(self)>=1, len(from)>=2, to="", maxcount>=1 */
-
-Py_LOCAL(PyBytesObject *)
-replace_delete_substring(PyBytesObject *self,
-			 const char *from_s, Py_ssize_t from_len,
-			 Py_ssize_t maxcount) {
-	char *self_s, *result_s;
-	char *start, *next, *end;
-	Py_ssize_t self_len, result_len;
-	Py_ssize_t count, offset;
-	PyBytesObject *result;
-
-	self_len = PyBytes_GET_SIZE(self);
-	self_s = PyBytes_AS_STRING(self);
-
-	count = countstring(self_s, self_len,
-			    from_s, from_len,
-			    0, self_len, 1,
-			    maxcount);
-
-	if (count == 0) {
-		/* no matches */
-		return return_self(self);
-	}
-
-	result_len = self_len - (count * from_len);
-	assert (result_len>=0);
-
-	if ( (result = (PyBytesObject *)
-	      PyBytes_FromStringAndSize(NULL, result_len)) == NULL )
-		return NULL;
-
-	result_s = PyBytes_AS_STRING(result);
-
-	start = self_s;
-	end = self_s + self_len;
-	while (count-- > 0) {
-		offset = findstring(start, end-start,
-				    from_s, from_len,
-				    0, end-start, FORWARD);
-		if (offset == -1)
-			break;
-		next = start + offset;
-
-		Py_MEMCPY(result_s, start, next-start);
-
-		result_s += (next-start);
-		start = next+from_len;
-	}
-	Py_MEMCPY(result_s, start, end-start);
-	return result;
-}
-
-/* len(self)>=1, len(from)==len(to)==1, maxcount>=1 */
-Py_LOCAL(PyBytesObject *)
-replace_single_character_in_place(PyBytesObject *self,
-				  char from_c, char to_c,
-				  Py_ssize_t maxcount)
-{
-	char *self_s, *result_s, *start, *end, *next;
-	Py_ssize_t self_len;
-	PyBytesObject *result;
-
-	/* The result string will be the same size */
-	self_s = PyBytes_AS_STRING(self);
-	self_len = PyBytes_GET_SIZE(self);
-
-	next = findchar(self_s, self_len, from_c);
-
-	if (next == NULL) {
-		/* No matches; return the original string */
-		return return_self(self);
-	}
-
-	/* Need to make a new string */
-	result = (PyBytesObject *) PyBytes_FromStringAndSize(NULL, self_len);
-	if (result == NULL)
-		return NULL;
-	result_s = PyBytes_AS_STRING(result);
-	Py_MEMCPY(result_s, self_s, self_len);
-
-	/* change everything in-place, starting with this one */
-	start =  result_s + (next-self_s);
-	*start = to_c;
-	start++;
-	end = result_s + self_len;
-
-	while (--maxcount > 0) {
-		next = findchar(start, end-start, from_c);
-		if (next == NULL)
-			break;
-		*next = to_c;
-		start = next+1;
-	}
-
-	return result;
-}
-
-/* len(self)>=1, len(from)==len(to)>=2, maxcount>=1 */
-Py_LOCAL(PyBytesObject *)
-replace_substring_in_place(PyBytesObject *self,
-			   const char *from_s, Py_ssize_t from_len,
-			   const char *to_s, Py_ssize_t to_len,
-			   Py_ssize_t maxcount)
-{
-	char *result_s, *start, *end;
-	char *self_s;
-	Py_ssize_t self_len, offset;
-	PyBytesObject *result;
-
-	/* The result string will be the same size */
-
-	self_s = PyBytes_AS_STRING(self);
-	self_len = PyBytes_GET_SIZE(self);
-
-	offset = findstring(self_s, self_len,
-			    from_s, from_len,
-			    0, self_len, FORWARD);
-	if (offset == -1) {
-		/* No matches; return the original string */
-		return return_self(self);
-	}
-
-	/* Need to make a new string */
-	result = (PyBytesObject *) PyBytes_FromStringAndSize(NULL, self_len);
-	if (result == NULL)
-		return NULL;
-	result_s = PyBytes_AS_STRING(result);
-	Py_MEMCPY(result_s, self_s, self_len);
-
-	/* change everything in-place, starting with this one */
-	start =  result_s + offset;
-	Py_MEMCPY(start, to_s, from_len);
-	start += from_len;
-	end = result_s + self_len;
-
-	while ( --maxcount > 0) {
-		offset = findstring(start, end-start,
-				    from_s, from_len,
-				    0, end-start, FORWARD);
-		if (offset==-1)
-			break;
-		Py_MEMCPY(start+offset, to_s, from_len);
-		start += offset+from_len;
-	}
-
-	return result;
-}
-
-/* len(self)>=1, len(from)==1, len(to)>=2, maxcount>=1 */
-Py_LOCAL(PyBytesObject *)
-replace_single_character(PyBytesObject *self,
-			 char from_c,
-			 const char *to_s, Py_ssize_t to_len,
-			 Py_ssize_t maxcount)
-{
-	char *self_s, *result_s;
-	char *start, *next, *end;
-	Py_ssize_t self_len, result_len;
-	Py_ssize_t count, product;
-	PyBytesObject *result;
-
-	self_s = PyBytes_AS_STRING(self);
-	self_len = PyBytes_GET_SIZE(self);
-
-	count = countchar(self_s, self_len, from_c, maxcount);
-	if (count == 0) {
-		/* no matches, return unchanged */
-		return return_self(self);
-	}
-
-	/* use the difference between current and new, hence the "-1" */
-	/*   result_len = self_len + count * (to_len-1)  */
-	product = count * (to_len-1);
-	if (product / (to_len-1) != count) {
-		PyErr_SetString(PyExc_OverflowError,
-				"replace string is too long");
-		return NULL;
-	}
-	result_len = self_len + product;
-	if (result_len < 0) {
-		PyErr_SetString(PyExc_OverflowError,
-				"replace string is too long");
-		return NULL;
-	}
-
-	if ( (result = (PyBytesObject *)
-	      PyBytes_FromStringAndSize(NULL, result_len)) == NULL)
-		return NULL;
-	result_s = PyBytes_AS_STRING(result);
-
-	start = self_s;
-	end = self_s + self_len;
-	while (count-- > 0) {
-		next = findchar(start, end-start, from_c);
-		if (next == NULL)
-			break;
-
-		if (next == start) {
-			/* replace with the 'to' */
-			Py_MEMCPY(result_s, to_s, to_len);
-			result_s += to_len;
-			start += 1;
-		} else {
-			/* copy the unchanged old then the 'to' */
-			Py_MEMCPY(result_s, start, next-start);
-			result_s += (next-start);
-			Py_MEMCPY(result_s, to_s, to_len);
-			result_s += to_len;
-			start = next+1;
-		}
-	}
-	/* Copy the remainder of the remaining string */
-	Py_MEMCPY(result_s, start, end-start);
-
-	return result;
-}
-
-/* len(self)>=1, len(from)>=2, len(to)>=2, maxcount>=1 */
-Py_LOCAL(PyBytesObject *)
-replace_substring(PyBytesObject *self,
-		  const char *from_s, Py_ssize_t from_len,
-		  const char *to_s, Py_ssize_t to_len,
-		  Py_ssize_t maxcount) {
-	char *self_s, *result_s;
-	char *start, *next, *end;
-	Py_ssize_t self_len, result_len;
-	Py_ssize_t count, offset, product;
-	PyBytesObject *result;
-
-	self_s = PyBytes_AS_STRING(self);
-	self_len = PyBytes_GET_SIZE(self);
-
-	count = countstring(self_s, self_len,
-			    from_s, from_len,
-			    0, self_len, FORWARD, maxcount);
-	if (count == 0) {
-		/* no matches, return unchanged */
-		return return_self(self);
-	}
-
-	/* Check for overflow */
-	/*    result_len = self_len + count * (to_len-from_len) */
-	product = count * (to_len-from_len);
-	if (product / (to_len-from_len) != count) {
-		PyErr_SetString(PyExc_OverflowError,
-				"replace string is too long");
-		return NULL;
-	}
-	result_len = self_len + product;
-	if (result_len < 0) {
-		PyErr_SetString(PyExc_OverflowError,
-				"replace string is too long");
-		return NULL;
-	}
-
-	if ( (result = (PyBytesObject *)
-	      PyBytes_FromStringAndSize(NULL, result_len)) == NULL)
-		return NULL;
-	result_s = PyBytes_AS_STRING(result);
-
-	start = self_s;
-	end = self_s + self_len;
-	while (count-- > 0) {
-		offset = findstring(start, end-start,
-				    from_s, from_len,
-				    0, end-start, FORWARD);
-		if (offset == -1)
-			break;
-		next = start+offset;
-		if (next == start) {
-			/* replace with the 'to' */
-			Py_MEMCPY(result_s, to_s, to_len);
-			result_s += to_len;
-			start += from_len;
-		} else {
-			/* copy the unchanged old then the 'to' */
-			Py_MEMCPY(result_s, start, next-start);
-			result_s += (next-start);
-			Py_MEMCPY(result_s, to_s, to_len);
-			result_s += to_len;
-			start = next+from_len;
-		}
-	}
-	/* Copy the remainder of the remaining string */
-	Py_MEMCPY(result_s, start, end-start);
-
-	return result;
-}
-
-
-Py_LOCAL(PyBytesObject *)
-replace(PyBytesObject *self,
-	const char *from_s, Py_ssize_t from_len,
-	const char *to_s, Py_ssize_t to_len,
-	Py_ssize_t maxcount)
-{
-	if (maxcount < 0) {
-		maxcount = PY_SSIZE_T_MAX;
-	} else if (maxcount == 0 || PyBytes_GET_SIZE(self) == 0) {
-		/* nothing to do; return the original string */
-		return return_self(self);
-	}
-
-	if (maxcount == 0 ||
-	    (from_len == 0 && to_len == 0)) {
-		/* nothing to do; return the original string */
-		return return_self(self);
-	}
-
-	/* Handle zero-length special cases */
-
-	if (from_len == 0) {
-		/* insert the 'to' string everywhere.   */
-		/*    >>> "Python".replace("", ".")     */
-		/*    '.P.y.t.h.o.n.'                   */
-		return replace_interleave(self, to_s, to_len, maxcount);
-	}
-
-	/* Except for "".replace("", "A") == "A" there is no way beyond this */
-	/* point for an empty self string to generate a non-empty string */
-	/* Special case so the remaining code always gets a non-empty string */
-	if (PyBytes_GET_SIZE(self) == 0) {
-		return return_self(self);
-	}
-
-	if (to_len == 0) {
-		/* delete all occurances of 'from' string */
-		if (from_len == 1) {
-			return replace_delete_single_character(
-				self, from_s[0], maxcount);
-		} else {
-			return replace_delete_substring(self, from_s,
-							from_len, maxcount);
-		}
-	}
-
-	/* Handle special case where both strings have the same length */
-
-	if (from_len == to_len) {
-		if (from_len == 1) {
-			return replace_single_character_in_place(
-				self,
-				from_s[0],
-				to_s[0],
-				maxcount);
-		} else {
-			return replace_substring_in_place(
-				self, from_s, from_len, to_s, to_len,
-				maxcount);
-		}
-	}
-
-	/* Otherwise use the more generic algorithms */
-	if (from_len == 1) {
-		return replace_single_character(self, from_s[0],
-						to_s, to_len, maxcount);
-	} else {
-		/* len('from')>=2, len('to')>=1 */
-		return replace_substring(self, from_s, from_len, to_s, to_len,
-					 maxcount);
-	}
-}
-
-PyDoc_STRVAR(replace__doc__,
-"B.replace(old, new[, count]) -> bytes\n\
-\n\
-Return a copy of B with all occurrences of subsection\n\
-old replaced by new.  If the optional argument count is\n\
-given, only the first count occurrences are replaced.");
-
-static PyObject *
-string_replace(PyBytesObject *self, PyObject *args)
-{
-	Py_ssize_t count = -1;
-	PyObject *from, *to;
-	const char *from_s, *to_s;
-	Py_ssize_t from_len, to_len;
-
-	if (!PyArg_ParseTuple(args, "OO|n:replace", &from, &to, &count))
-		return NULL;
-
-	if (PyBytes_Check(from)) {
-		from_s = PyBytes_AS_STRING(from);
-		from_len = PyBytes_GET_SIZE(from);
-	}
-	else if (PyObject_AsCharBuffer(from, &from_s, &from_len))
-		return NULL;
-
-	if (PyBytes_Check(to)) {
-		to_s = PyBytes_AS_STRING(to);
-		to_len = PyBytes_GET_SIZE(to);
-	}
-	else if (PyObject_AsCharBuffer(to, &to_s, &to_len))
-		return NULL;
-
-	return (PyObject *)replace((PyBytesObject *) self,
-				   from_s, from_len,
-				   to_s, to_len, count);
-}
-
-/** End DALKE **/
-
-/* Matches the end (direction >= 0) or start (direction < 0) of self
- * against substr, using the start and end arguments. Returns
- * -1 on error, 0 if not found and 1 if found.
- */
-Py_LOCAL(int)
-_string_tailmatch(PyBytesObject *self, PyObject *substr, Py_ssize_t start,
-		  Py_ssize_t end, int direction)
-{
-	Py_ssize_t len = PyBytes_GET_SIZE(self);
-	Py_ssize_t slen;
-	const char* sub;
-	const char* str;
-
-	if (PyBytes_Check(substr)) {
-		sub = PyBytes_AS_STRING(substr);
-		slen = PyBytes_GET_SIZE(substr);
-	}
-	else if (PyObject_AsCharBuffer(substr, &sub, &slen))
-		return -1;
-	str = PyBytes_AS_STRING(self);
-
-	string_adjust_indices(&start, &end, len);
-
-	if (direction < 0) {
-		/* startswith */
-		if (start+slen > len)
-			return 0;
-	} else {
-		/* endswith */
-		if (end-start < slen || start > len)
-			return 0;
-
-		if (end-slen > start)
-			start = end - slen;
-	}
-	if (end-start >= slen)
-		return ! memcmp(str+start, sub, slen);
-	return 0;
-}
-
-
-PyDoc_STRVAR(startswith__doc__,
-"B.startswith(prefix [,start [,end]]) -> bool\n\
-\n\
-Return True if B starts with the specified prefix, False otherwise.\n\
-With optional start, test B beginning at that position.\n\
-With optional end, stop comparing B at that position.\n\
-prefix can also be a tuple of strings to try.");
-
-static PyObject *
-string_startswith(PyBytesObject *self, PyObject *args)
-{
-	Py_ssize_t start = 0;
-	Py_ssize_t end = PY_SSIZE_T_MAX;
-	PyObject *subobj;
-	int result;
-
-	if (!PyArg_ParseTuple(args, "O|O&O&:startswith", &subobj,
-		_PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
-		return NULL;
-	if (PyTuple_Check(subobj)) {
-		Py_ssize_t i;
-		for (i = 0; i < PyTuple_GET_SIZE(subobj); i++) {
-			result = _string_tailmatch(self,
-					PyTuple_GET_ITEM(subobj, i),
-					start, end, -1);
-			if (result == -1)
-				return NULL;
-			else if (result) {
-				Py_RETURN_TRUE;
-			}
-		}
-		Py_RETURN_FALSE;
-	}
-	result = _string_tailmatch(self, subobj, start, end, -1);
-	if (result == -1)
-		return NULL;
-	else
-		return PyBool_FromLong(result);
-}
-
-
-PyDoc_STRVAR(endswith__doc__,
-"B.endswith(suffix [,start [,end]]) -> bool\n\
-\n\
-Return True if B ends with the specified suffix, False otherwise.\n\
-With optional start, test B beginning at that position.\n\
-With optional end, stop comparing B at that position.\n\
-suffix can also be a tuple of strings to try.");
-
-static PyObject *
-string_endswith(PyBytesObject *self, PyObject *args)
-{
-	Py_ssize_t start = 0;
-	Py_ssize_t end = PY_SSIZE_T_MAX;
-	PyObject *subobj;
-	int result;
-
-	if (!PyArg_ParseTuple(args, "O|O&O&:endswith", &subobj,
-		_PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
-		return NULL;
-	if (PyTuple_Check(subobj)) {
-		Py_ssize_t i;
-		for (i = 0; i < PyTuple_GET_SIZE(subobj); i++) {
-			result = _string_tailmatch(self,
-					PyTuple_GET_ITEM(subobj, i),
-					start, end, +1);
-			if (result == -1)
-				return NULL;
-			else if (result) {
-				Py_RETURN_TRUE;
-			}
-		}
-		Py_RETURN_FALSE;
-	}
-	result = _string_tailmatch(self, subobj, start, end, +1);
-	if (result == -1)
-		return NULL;
-	else
-		return PyBool_FromLong(result);
-}
-
-
-PyDoc_STRVAR(decode__doc__,
-"B.decode([encoding[, errors]]) -> object\n\
-\n\
-Decodes S using the codec registered for encoding. encoding defaults\n\
-to the default encoding. errors may be given to set a different error\n\
-handling scheme.  Default is 'strict' meaning that encoding errors raise\n\
-a UnicodeDecodeError.  Other possible values are 'ignore' and 'replace'\n\
-as well as any other name registerd with codecs.register_error that is\n\
-able to handle UnicodeDecodeErrors.");
-
-static PyObject *
-string_decode(PyObject *self, PyObject *args)
-{
-	const char *encoding = NULL;
-	const char *errors = NULL;
-
-	if (!PyArg_ParseTuple(args, "|ss:decode", &encoding, &errors))
-		return NULL;
-	if (encoding == NULL)
-		encoding = PyUnicode_GetDefaultEncoding();
-	return PyCodec_Decode(self, encoding, errors);
-}
-
-
-PyDoc_STRVAR(fromhex_doc,
-"bytes.fromhex(string) -> bytes\n\
-\n\
-Create a bytes object from a string of hexadecimal numbers.\n\
-Spaces between two numbers are accepted.\n\
-Example: bytes.fromhex('B9 01EF') -> b'\\xb9\\x01\\xef'.");
-
-static int
-hex_digit_to_int(Py_UNICODE c)
-{
-	if (c >= 128)
-		return -1;
-	if (ISDIGIT(c))
-		return c - '0';
-	else {
-		if (ISUPPER(c))
-			c = TOLOWER(c);
-		if (c >= 'a' && c <= 'f')
-			return c - 'a' + 10;
-	}
-	return -1;
-}
-
-static PyObject *
-string_fromhex(PyObject *cls, PyObject *args)
-{
-	PyObject *newstring, *hexobj;
-	char *buf;
-	Py_UNICODE *hex;
-	Py_ssize_t hexlen, byteslen, i, j;
-	int top, bot;
-
-	if (!PyArg_ParseTuple(args, "U:fromhex", &hexobj))
-		return NULL;
-	assert(PyUnicode_Check(hexobj));
-	hexlen = PyUnicode_GET_SIZE(hexobj);
-	hex = PyUnicode_AS_UNICODE(hexobj);
-	byteslen = hexlen/2; /* This overestimates if there are spaces */
-	newstring = PyBytes_FromStringAndSize(NULL, byteslen);
-	if (!newstring)
-		return NULL;
-	buf = PyBytes_AS_STRING(newstring);
-	for (i = j = 0; i < hexlen; i += 2) {
-		/* skip over spaces in the input */
-		while (hex[i] == ' ')
-			i++;
-		if (i >= hexlen)
-			break;
-		top = hex_digit_to_int(hex[i]);
-		bot = hex_digit_to_int(hex[i+1]);
-		if (top == -1 || bot == -1) {
-			PyErr_Format(PyExc_ValueError,
-				     "non-hexadecimal number found in "
-				     "fromhex() arg at position %zd", i);
-			goto error;
-		}
-		buf[j++] = (top << 4) + bot;
-	}
-	if (j != byteslen && _PyBytes_Resize(&newstring, j) < 0)
-		goto error;
-	return newstring;
-
-  error:
-	Py_XDECREF(newstring);
-	return NULL;
-}
-
-
-static PyObject *
-string_getnewargs(PyBytesObject *v)
-{
-	return Py_BuildValue("(s#)", v->ob_sval, Py_SIZE(v));
-}
-
-
-static PyMethodDef
-string_methods[] = {
-	{"__getnewargs__",	(PyCFunction)string_getnewargs,	METH_NOARGS},
-	{"capitalize", (PyCFunction)stringlib_capitalize, METH_NOARGS,
-	 _Py_capitalize__doc__},
-	{"center", (PyCFunction)stringlib_center, METH_VARARGS, center__doc__},
-	{"count", (PyCFunction)string_count, METH_VARARGS, count__doc__},
-	{"decode", (PyCFunction)string_decode, METH_VARARGS, decode__doc__},
-	{"endswith", (PyCFunction)string_endswith, METH_VARARGS,
-         endswith__doc__},
-	{"expandtabs", (PyCFunction)stringlib_expandtabs, METH_VARARGS,
-	 expandtabs__doc__},
-	{"find", (PyCFunction)string_find, METH_VARARGS, find__doc__},
-        {"fromhex", (PyCFunction)string_fromhex, METH_VARARGS|METH_CLASS,
-         fromhex_doc},
-	{"index", (PyCFunction)string_index, METH_VARARGS, index__doc__},
-	{"isalnum", (PyCFunction)stringlib_isalnum, METH_NOARGS,
-         _Py_isalnum__doc__},
-	{"isalpha", (PyCFunction)stringlib_isalpha, METH_NOARGS,
-         _Py_isalpha__doc__},
-	{"isdigit", (PyCFunction)stringlib_isdigit, METH_NOARGS,
-         _Py_isdigit__doc__},
-	{"islower", (PyCFunction)stringlib_islower, METH_NOARGS,
-         _Py_islower__doc__},
-	{"isspace", (PyCFunction)stringlib_isspace, METH_NOARGS,
-         _Py_isspace__doc__},
-	{"istitle", (PyCFunction)stringlib_istitle, METH_NOARGS,
-         _Py_istitle__doc__},
-	{"isupper", (PyCFunction)stringlib_isupper, METH_NOARGS,
-         _Py_isupper__doc__},
-	{"join", (PyCFunction)string_join, METH_O, join__doc__},
-	{"ljust", (PyCFunction)stringlib_ljust, METH_VARARGS, ljust__doc__},
-	{"lower", (PyCFunction)stringlib_lower, METH_NOARGS, _Py_lower__doc__},
-	{"lstrip", (PyCFunction)string_lstrip, METH_VARARGS, lstrip__doc__},
-	{"partition", (PyCFunction)string_partition, METH_O, partition__doc__},
-	{"replace", (PyCFunction)string_replace, METH_VARARGS, replace__doc__},
-	{"rfind", (PyCFunction)string_rfind, METH_VARARGS, rfind__doc__},
-	{"rindex", (PyCFunction)string_rindex, METH_VARARGS, rindex__doc__},
-	{"rjust", (PyCFunction)stringlib_rjust, METH_VARARGS, rjust__doc__},
-	{"rpartition", (PyCFunction)string_rpartition, METH_O,
-	 rpartition__doc__},
-	{"rsplit", (PyCFunction)string_rsplit, METH_VARARGS, rsplit__doc__},
-	{"rstrip", (PyCFunction)string_rstrip, METH_VARARGS, rstrip__doc__},
-	{"split", (PyCFunction)string_split, METH_VARARGS, split__doc__},
-	{"splitlines", (PyCFunction)stringlib_splitlines, METH_VARARGS,
-	 splitlines__doc__},
-	{"startswith", (PyCFunction)string_startswith, METH_VARARGS,
-         startswith__doc__},
-	{"strip", (PyCFunction)string_strip, METH_VARARGS, strip__doc__},
-	{"swapcase", (PyCFunction)stringlib_swapcase, METH_NOARGS,
-	 _Py_swapcase__doc__},
-	{"title", (PyCFunction)stringlib_title, METH_NOARGS, _Py_title__doc__},
-	{"translate", (PyCFunction)string_translate, METH_VARARGS,
-	 translate__doc__},
-	{"upper", (PyCFunction)stringlib_upper, METH_NOARGS, _Py_upper__doc__},
-	{"zfill", (PyCFunction)stringlib_zfill, METH_VARARGS, zfill__doc__},
-	{NULL,     NULL}		     /* sentinel */
-};
-
-static PyObject *
-str_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
-
-static PyObject *
-string_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
-{
-	PyObject *x = NULL, *it;
-	const char *encoding = NULL;
-	const char *errors = NULL;
-	PyObject *new = NULL;
-	Py_ssize_t i, size;
-	static char *kwlist[] = {"source", "encoding", "errors", 0};
-
-	if (type != &PyBytes_Type)
-		return str_subtype_new(type, args, kwds);
-	if (!PyArg_ParseTupleAndKeywords(args, kwds, "|Oss:bytes", kwlist, &x,
-					 &encoding, &errors))
-		return NULL;
-	if (x == NULL) {
-		if (encoding != NULL || errors != NULL) {
-			PyErr_SetString(PyExc_TypeError,
-					"encoding or errors without sequence "
-					"argument");
-			return NULL;
-		}
-		return PyBytes_FromString("");
-	}
-
-	if (PyUnicode_Check(x)) {
-		/* Encode via the codec registry */
-		if (encoding == NULL) {
-			PyErr_SetString(PyExc_TypeError,
-					"string argument without an encoding");
-			return NULL;
-		}
-		new = PyCodec_Encode(x, encoding, errors);
-		if (new == NULL)
-			return NULL;
-		assert(PyBytes_Check(new));
-		return new;
-	}
-
-	/* If it's not unicode, there can't be encoding or errors */
-	if (encoding != NULL || errors != NULL) {
-		PyErr_SetString(PyExc_TypeError,
-			"encoding or errors without a string argument");
-		return NULL;
-	}
-
-	/* Is it an int? */
-	size = PyNumber_AsSsize_t(x, PyExc_ValueError);
-	if (size == -1 && PyErr_Occurred()) {
-		PyErr_Clear();
-	}
-	else {
-		if (size < 0) {
-			PyErr_SetString(PyExc_ValueError, "negative count");
-			return NULL;
-		}
-		new = PyBytes_FromStringAndSize(NULL, size);
-		if (new == NULL) {
-			return NULL;
-		}
-		if (size > 0) {
-			memset(((PyBytesObject*)new)->ob_sval, 0, size);
-		}
-		return new;
-	}
-
-	/* Use the modern buffer interface */
-	if (PyObject_CheckBuffer(x)) {
-		Py_buffer view;
-		if (PyObject_GetBuffer(x, &view, PyBUF_FULL_RO) < 0)
-			return NULL;
-		new = PyBytes_FromStringAndSize(NULL, view.len);
-		if (!new)
-			goto fail;
-		// XXX(brett.cannon): Better way to get to internal buffer?
-		if (PyBuffer_ToContiguous(((PyBytesObject *)new)->ob_sval,
-					  &view, view.len, 'C') < 0)
-			goto fail;
-		PyObject_ReleaseBuffer(x, &view);
-		return new;
-	  fail:
-		Py_XDECREF(new);
-		PyObject_ReleaseBuffer(x, &view);
-		return NULL;
-	}
-
-	/* For iterator version, create a string object and resize as needed */
-	/* XXX(gb): is 64 a good value? also, optimize if length is known */
-	/* XXX(guido): perhaps use Pysequence_Fast() -- I can't imagine the
-	   input being a truly long iterator. */
-	size = 64;
-	new = PyBytes_FromStringAndSize(NULL, size);
-	if (new == NULL)
-		return NULL;
-
-	/* XXX Optimize this if the arguments is a list, tuple */
-
-	/* Get the iterator */
-	it = PyObject_GetIter(x);
-	if (it == NULL)
-		goto error;
-
-	/* Run the iterator to exhaustion */
-	for (i = 0; ; i++) {
-		PyObject *item;
-		Py_ssize_t value;
-
-		/* Get the next item */
-		item = PyIter_Next(it);
-		if (item == NULL) {
-			if (PyErr_Occurred())
-				goto error;
-			break;
-		}
-
-		/* Interpret it as an int (__index__) */
-		value = PyNumber_AsSsize_t(item, PyExc_ValueError);
-		Py_DECREF(item);
-		if (value == -1 && PyErr_Occurred())
-			goto error;
-
-		/* Range check */
-		if (value < 0 || value >= 256) {
-			PyErr_SetString(PyExc_ValueError,
-					"bytes must be in range(0, 256)");
-			goto error;
-		}
-
-		/* Append the byte */
-		if (i >= size) {
-			size *= 2;
-			if (_PyBytes_Resize(&new, size) < 0)
-				goto error;
-		}
-		((PyBytesObject *)new)->ob_sval[i] = value;
-	}
-	_PyBytes_Resize(&new, i);
-
-	/* Clean up and return success */
-	Py_DECREF(it);
-	return new;
-
-  error:
-	/* Error handling when new != NULL */
-	Py_XDECREF(it);
-	Py_DECREF(new);
-	return NULL;
-}
-
-static PyObject *
-str_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
-{
-	PyObject *tmp, *pnew;
-	Py_ssize_t n;
-
-	assert(PyType_IsSubtype(type, &PyBytes_Type));
-	tmp = string_new(&PyBytes_Type, args, kwds);
-	if (tmp == NULL)
-		return NULL;
-	assert(PyBytes_CheckExact(tmp));
-	n = PyBytes_GET_SIZE(tmp);
-	pnew = type->tp_alloc(type, n);
-	if (pnew != NULL) {
-		Py_MEMCPY(PyBytes_AS_STRING(pnew),
-			  PyBytes_AS_STRING(tmp), n+1);
-		((PyBytesObject *)pnew)->ob_shash =
-			((PyBytesObject *)tmp)->ob_shash;
-	}
-	Py_DECREF(tmp);
-	return pnew;
-}
-
-PyDoc_STRVAR(string_doc,
-"bytes(iterable_of_ints) -> bytes.\n\
-bytes(string, encoding[, errors]) -> bytes\n\
-bytes(bytes_or_buffer) -> immutable copy of bytes_or_buffer.\n\
-bytes(memory_view) -> bytes.\n\
-\n\
-Construct an immutable array of bytes from:\n\
-  - an iterable yielding integers in range(256)\n\
-  - a text string encoded using the specified encoding\n\
-  - a bytes or a buffer object\n\
-  - any object implementing the buffer API.");
-
-static PyObject *str_iter(PyObject *seq);
-
-PyTypeObject PyBytes_Type = {
-	PyVarObject_HEAD_INIT(&PyType_Type, 0)
-	"bytes",
-	sizeof(PyBytesObject),
-	sizeof(char),
- 	string_dealloc, 			/* tp_dealloc */
-	0,			 		/* tp_print */
-	0,					/* tp_getattr */
-	0,					/* tp_setattr */
-	0,					/* tp_compare */
-	(reprfunc)string_repr, 			/* tp_repr */
-	0,					/* tp_as_number */
-	&string_as_sequence,			/* tp_as_sequence */
-	&string_as_mapping,			/* tp_as_mapping */
-	(hashfunc)string_hash, 			/* tp_hash */
-	0,					/* tp_call */
-	string_str,				/* tp_str */
-	PyObject_GenericGetAttr,		/* tp_getattro */
-	0,					/* tp_setattro */
-	&string_as_buffer,			/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
-		Py_TPFLAGS_BYTES_SUBCLASS,	/* tp_flags */
-	string_doc,				/* tp_doc */
-	0,					/* tp_traverse */
-	0,					/* tp_clear */
-	(richcmpfunc)string_richcompare,	/* tp_richcompare */
-	0,					/* tp_weaklistoffset */
-	str_iter,				/* tp_iter */
-	0,					/* tp_iternext */
-	string_methods,				/* tp_methods */
-	0,					/* tp_members */
-	0,					/* tp_getset */
-	&PyBaseObject_Type,			/* tp_base */
-	0,					/* tp_dict */
-	0,					/* tp_descr_get */
-	0,					/* tp_descr_set */
-	0,					/* tp_dictoffset */
-	0,					/* tp_init */
-	0,					/* tp_alloc */
-	string_new,				/* tp_new */
-	PyObject_Del,	                	/* tp_free */
-};
-
-void
-PyBytes_Concat(register PyObject **pv, register PyObject *w)
-{
-	register PyObject *v;
-	assert(pv != NULL);
-	if (*pv == NULL)
-		return;
-	if (w == NULL) {
-		Py_DECREF(*pv);
-		*pv = NULL;
-		return;
-	}
-	v = string_concat(*pv, w);
-	Py_DECREF(*pv);
-	*pv = v;
-}
-
-void
-PyBytes_ConcatAndDel(register PyObject **pv, register PyObject *w)
-{
-	PyBytes_Concat(pv, w);
-	Py_XDECREF(w);
-}
-
-
-/* The following function breaks the notion that strings are immutable:
-   it changes the size of a string.  We get away with this only if there
-   is only one module referencing the object.  You can also think of it
-   as creating a new string object and destroying the old one, only
-   more efficiently.  In any case, don't use this if the string may
-   already be known to some other part of the code...
-   Note that if there's not enough memory to resize the string, the original
-   string object at *pv is deallocated, *pv is set to NULL, an "out of
-   memory" exception is set, and -1 is returned.  Else (on success) 0 is
-   returned, and the value in *pv may or may not be the same as on input.
-   As always, an extra byte is allocated for a trailing \0 byte (newsize
-   does *not* include that), and a trailing \0 byte is stored.
-*/
-
-int
-_PyBytes_Resize(PyObject **pv, Py_ssize_t newsize)
-{
-	register PyObject *v;
-	register PyBytesObject *sv;
-	v = *pv;
-	if (!PyBytes_Check(v) || Py_REFCNT(v) != 1 || newsize < 0) {
-		*pv = 0;
-		Py_DECREF(v);
-		PyErr_BadInternalCall();
-		return -1;
-	}
-	/* XXX UNREF/NEWREF interface should be more symmetrical */
-	_Py_DEC_REFTOTAL;
-	_Py_ForgetReference(v);
-	*pv = (PyObject *)
-		PyObject_REALLOC((char *)v, sizeof(PyBytesObject) + newsize);
-	if (*pv == NULL) {
-		PyObject_Del(v);
-		PyErr_NoMemory();
-		return -1;
-	}
-	_Py_NewReference(*pv);
-	sv = (PyBytesObject *) *pv;
-	Py_SIZE(sv) = newsize;
-	sv->ob_sval[newsize] = '\0';
-	sv->ob_shash = -1;	/* invalidate cached hash value */
-	return 0;
-}
-
-/* _PyBytes_FormatLong emulates the format codes d, u, o, x and X, and
- * the F_ALT flag, for Python's long (unbounded) ints.  It's not used for
- * Python's regular ints.
- * Return value:  a new PyString*, or NULL if error.
- *  .  *pbuf is set to point into it,
- *     *plen set to the # of chars following that.
- *     Caller must decref it when done using pbuf.
- *     The string starting at *pbuf is of the form
- *         "-"? ("0x" | "0X")? digit+
- *     "0x"/"0X" are present only for x and X conversions, with F_ALT
- *         set in flags.  The case of hex digits will be correct,
- *     There will be at least prec digits, zero-filled on the left if
- *         necessary to get that many.
- * val		object to be converted
- * flags	bitmask of format flags; only F_ALT is looked at
- * prec		minimum number of digits; 0-fill on left if needed
- * type		a character in [duoxX]; u acts the same as d
- *
- * CAUTION:  o, x and X conversions on regular ints can never
- * produce a '-' sign, but can for Python's unbounded ints.
- */
-PyObject*
-_PyBytes_FormatLong(PyObject *val, int flags, int prec, int type,
-		     char **pbuf, int *plen)
-{
-	PyObject *result = NULL;
-	char *buf;
-	Py_ssize_t i;
-	int sign;	/* 1 if '-', else 0 */
-	int len;	/* number of characters */
-	Py_ssize_t llen;
-	int numdigits;	/* len == numnondigits + numdigits */
-	int numnondigits = 0;
-
-	/* Avoid exceeding SSIZE_T_MAX */
-	if (prec > PY_SSIZE_T_MAX-3) {
-		PyErr_SetString(PyExc_OverflowError,
-				"precision too large");
-		return NULL;
-	}
-
-	switch (type) {
-	case 'd':
-	case 'u':
-		/* Special-case boolean: we want 0/1 */
-		if (PyBool_Check(val))
-			result = PyNumber_ToBase(val, 10);
-		else
-			result = Py_TYPE(val)->tp_str(val);
-		break;
-	case 'o':
-		numnondigits = 2;
-		result = PyNumber_ToBase(val, 8);
-		break;
-	case 'x':
-	case 'X':
-		numnondigits = 2;
-		result = PyNumber_ToBase(val, 16);
-		break;
-	default:
-		assert(!"'type' not in [duoxX]");
-	}
-	if (!result)
-		return NULL;
-
-	buf = PyUnicode_AsString(result);
-	if (!buf) {
-		Py_DECREF(result);
-		return NULL;
-	}
-
-	/* To modify the string in-place, there can only be one reference. */
-	if (Py_REFCNT(result) != 1) {
-		PyErr_BadInternalCall();
-		return NULL;
-	}
-	llen = PyUnicode_GetSize(result);
-	if (llen > INT_MAX) {
-		PyErr_SetString(PyExc_ValueError,
-				"string too large in _PyBytes_FormatLong");
-		return NULL;
-	}
-	len = (int)llen;
-	if (buf[len-1] == 'L') {
-		--len;
-		buf[len] = '\0';
-	}
-	sign = buf[0] == '-';
-	numnondigits += sign;
-	numdigits = len - numnondigits;
-	assert(numdigits > 0);
-
-	/* Get rid of base marker unless F_ALT */
-	if (((flags & F_ALT) == 0 &&
-	    (type == 'o' || type == 'x' || type == 'X'))) {
-		assert(buf[sign] == '0');
-		assert(buf[sign+1] == 'x' || buf[sign+1] == 'X' ||
-		       buf[sign+1] == 'o');
-		numnondigits -= 2;
-		buf += 2;
-		len -= 2;
-		if (sign)
-			buf[0] = '-';
-		assert(len == numnondigits + numdigits);
-		assert(numdigits > 0);
-	}
-
-	/* Fill with leading zeroes to meet minimum width. */
-	if (prec > numdigits) {
-		PyObject *r1 = PyBytes_FromStringAndSize(NULL,
-					numnondigits + prec);
-		char *b1;
-		if (!r1) {
-			Py_DECREF(result);
-			return NULL;
-		}
-		b1 = PyBytes_AS_STRING(r1);
-		for (i = 0; i < numnondigits; ++i)
-			*b1++ = *buf++;
-		for (i = 0; i < prec - numdigits; i++)
-			*b1++ = '0';
-		for (i = 0; i < numdigits; i++)
-			*b1++ = *buf++;
-		*b1 = '\0';
-		Py_DECREF(result);
-		result = r1;
-		buf = PyBytes_AS_STRING(result);
-		len = numnondigits + prec;
-	}
-
-	/* Fix up case for hex conversions. */
-	if (type == 'X') {
-		/* Need to convert all lower case letters to upper case.
-		   and need to convert 0x to 0X (and -0x to -0X). */
-		for (i = 0; i < len; i++)
-			if (buf[i] >= 'a' && buf[i] <= 'x')
-				buf[i] -= 'a'-'A';
-	}
-	*pbuf = buf;
-	*plen = len;
-	return result;
-}
-
-void
-PyBytes_Fini(void)
-{
-	int i;
-	for (i = 0; i < UCHAR_MAX + 1; i++) {
-		Py_XDECREF(characters[i]);
-		characters[i] = NULL;
-	}
-	Py_XDECREF(nullstring);
-	nullstring = NULL;
-}
-
-/*********************** Str Iterator ****************************/
-
-typedef struct {
-	PyObject_HEAD
-	Py_ssize_t it_index;
-	PyBytesObject *it_seq; /* Set to NULL when iterator is exhausted */
-} striterobject;
-
-static void
-striter_dealloc(striterobject *it)
-{
-	_PyObject_GC_UNTRACK(it);
-	Py_XDECREF(it->it_seq);
-	PyObject_GC_Del(it);
-}
-
-static int
-striter_traverse(striterobject *it, visitproc visit, void *arg)
-{
-	Py_VISIT(it->it_seq);
-	return 0;
-}
-
-static PyObject *
-striter_next(striterobject *it)
-{
-	PyBytesObject *seq;
-	PyObject *item;
-
-	assert(it != NULL);
-	seq = it->it_seq;
-	if (seq == NULL)
-		return NULL;
-	assert(PyBytes_Check(seq));
-
-	if (it->it_index < PyBytes_GET_SIZE(seq)) {
-		item = PyLong_FromLong(
-			(unsigned char)seq->ob_sval[it->it_index]);
-		if (item != NULL)
-			++it->it_index;
-		return item;
-	}
-
-	Py_DECREF(seq);
-	it->it_seq = NULL;
-	return NULL;
-}
-
-static PyObject *
-striter_len(striterobject *it)
-{
-	Py_ssize_t len = 0;
-	if (it->it_seq)
-		len = PyBytes_GET_SIZE(it->it_seq) - it->it_index;
-	return PyLong_FromSsize_t(len);
-}
-
-PyDoc_STRVAR(length_hint_doc,
-	     "Private method returning an estimate of len(list(it)).");
-
-static PyMethodDef striter_methods[] = {
-	{"__length_hint__", (PyCFunction)striter_len, METH_NOARGS,
-	 length_hint_doc},
- 	{NULL,		NULL}		/* sentinel */
-};
-
-PyTypeObject PyBytesIter_Type = {
-	PyVarObject_HEAD_INIT(&PyType_Type, 0)
-	"bytes_iterator",			/* tp_name */
-	sizeof(striterobject),			/* tp_basicsize */
-	0,					/* tp_itemsize */
-	/* methods */
-	(destructor)striter_dealloc,		/* tp_dealloc */
-	0,					/* tp_print */
-	0,					/* tp_getattr */
-	0,					/* tp_setattr */
-	0,					/* tp_compare */
-	0,					/* tp_repr */
-	0,					/* tp_as_number */
-	0,					/* tp_as_sequence */
-	0,					/* tp_as_mapping */
-	0,					/* tp_hash */
-	0,					/* tp_call */
-	0,					/* tp_str */
-	PyObject_GenericGetAttr,		/* tp_getattro */
-	0,					/* tp_setattro */
-	0,					/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
-	0,					/* tp_doc */
-	(traverseproc)striter_traverse,	/* tp_traverse */
-	0,					/* tp_clear */
-	0,					/* tp_richcompare */
-	0,					/* tp_weaklistoffset */
-	PyObject_SelfIter,			/* tp_iter */
-	(iternextfunc)striter_next,		/* tp_iternext */
-	striter_methods,			/* tp_methods */
-	0,
-};
-
-static PyObject *
-str_iter(PyObject *seq)
-{
-	striterobject *it;
-
-	if (!PyBytes_Check(seq)) {
-		PyErr_BadInternalCall();
-		return NULL;
-	}
-	it = PyObject_GC_New(striterobject, &PyBytesIter_Type);
-	if (it == NULL)
-		return NULL;
-	it->it_index = 0;
-	Py_INCREF(seq);
-	it->it_seq = (PyBytesObject *)seq;
-	_PyObject_GC_TRACK(it);
-	return (PyObject *)it;
-}
diff --git a/PCbuild/pythoncore.vcproj b/PCbuild/pythoncore.vcproj
index 50242b8..5cb0e35 100644
--- a/PCbuild/pythoncore.vcproj
+++ b/PCbuild/pythoncore.vcproj
@@ -655,6 +655,10 @@
 				>
 			</File>
 			<File
+				RelativePath="..\Include\bytearrayobject.h"
+				>
+			</File>
+			<File
 				RelativePath="..\Include\bytesobject.h"
 				>
 			</File>
@@ -923,10 +927,6 @@
 				>
 			</File>
 			<File
-				RelativePath="..\Include\stringobject.h"
-				>
-			</File>
-			<File
 				RelativePath="..\Include\structmember.h"
 				>
 			</File>
@@ -1343,6 +1343,10 @@
 				>
 			</File>
 			<File
+				RelativePath="..\Objects\bytearrayobject.c"
+				>
+			</File>
+			<File
 				RelativePath="..\Objects\bytesobject.c"
 				>
 			</File>
@@ -1463,10 +1467,6 @@
 				>
 			</File>
 			<File
-				RelativePath="..\Objects\stringobject.c"
-				>
-			</File>
-			<File
 				RelativePath="..\Objects\structseq.c"
 				>
 			</File>
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 18fb122..487405f 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -12,7 +12,7 @@
 
 #ifndef PGEN
 #include "unicodeobject.h"
-#include "stringobject.h"
+#include "bytesobject.h"
 #include "fileobject.h"
 #include "codecs.h"
 #include "abstract.h"