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-rw-r--r--Modules/_struct.c1660
1 files changed, 1660 insertions, 0 deletions
diff --git a/Modules/_struct.c b/Modules/_struct.c
new file mode 100644
index 0000000..cb2e538
--- /dev/null
+++ b/Modules/_struct.c
@@ -0,0 +1,1660 @@
+/* struct module -- pack values into and (out of) strings */
+
+/* New version supporting byte order, alignment and size options,
+ character strings, and unsigned numbers */
+
+#define PY_SSIZE_T_CLEAN
+
+#include "Python.h"
+#include "structseq.h"
+#include "structmember.h"
+#include <ctype.h>
+
+static PyTypeObject PyStructType;
+
+/* compatibility macros */
+#if (PY_VERSION_HEX < 0x02050000)
+typedef int Py_ssize_t;
+#endif
+
+/* The translation function for each format character is table driven */
+typedef struct _formatdef {
+ char format;
+ Py_ssize_t size;
+ Py_ssize_t alignment;
+ PyObject* (*unpack)(const char *,
+ const struct _formatdef *);
+ int (*pack)(char *, PyObject *,
+ const struct _formatdef *);
+} formatdef;
+
+typedef struct _formatcode {
+ const struct _formatdef *fmtdef;
+ Py_ssize_t offset;
+ Py_ssize_t size;
+} formatcode;
+
+/* Struct object interface */
+
+typedef struct {
+ PyObject_HEAD
+ Py_ssize_t s_size;
+ Py_ssize_t s_len;
+ formatcode *s_codes;
+ PyObject *s_format;
+ PyObject *weakreflist; /* List of weak references */
+} PyStructObject;
+
+
+#define PyStruct_Check(op) PyObject_TypeCheck(op, &PyStructType)
+#define PyStruct_CheckExact(op) ((op)->ob_type == &PyStructType)
+
+
+/* Exception */
+
+static PyObject *StructError;
+
+
+/* Define various structs to figure out the alignments of types */
+
+
+typedef struct { char c; short x; } st_short;
+typedef struct { char c; int x; } st_int;
+typedef struct { char c; long x; } st_long;
+typedef struct { char c; float x; } st_float;
+typedef struct { char c; double x; } st_double;
+typedef struct { char c; void *x; } st_void_p;
+
+#define SHORT_ALIGN (sizeof(st_short) - sizeof(short))
+#define INT_ALIGN (sizeof(st_int) - sizeof(int))
+#define LONG_ALIGN (sizeof(st_long) - sizeof(long))
+#define FLOAT_ALIGN (sizeof(st_float) - sizeof(float))
+#define DOUBLE_ALIGN (sizeof(st_double) - sizeof(double))
+#define VOID_P_ALIGN (sizeof(st_void_p) - sizeof(void *))
+
+/* We can't support q and Q in native mode unless the compiler does;
+ in std mode, they're 8 bytes on all platforms. */
+#ifdef HAVE_LONG_LONG
+typedef struct { char c; PY_LONG_LONG x; } s_long_long;
+#define LONG_LONG_ALIGN (sizeof(s_long_long) - sizeof(PY_LONG_LONG))
+#endif
+
+#define STRINGIFY(x) #x
+
+#ifdef __powerc
+#pragma options align=reset
+#endif
+
+/* Helper to get a PyLongObject by hook or by crook. Caller should decref. */
+
+static PyObject *
+get_pylong(PyObject *v)
+{
+ PyNumberMethods *m;
+
+ assert(v != NULL);
+ if (PyInt_Check(v))
+ return PyLong_FromLong(PyInt_AS_LONG(v));
+ if (PyLong_Check(v)) {
+ Py_INCREF(v);
+ return v;
+ }
+ m = v->ob_type->tp_as_number;
+ if (m != NULL && m->nb_long != NULL) {
+ v = m->nb_long(v);
+ if (v == NULL)
+ return NULL;
+ if (PyLong_Check(v))
+ return v;
+ Py_DECREF(v);
+ }
+ PyErr_SetString(StructError,
+ "cannot convert argument to long");
+ return NULL;
+}
+
+/* Helper routine to get a Python integer and raise the appropriate error
+ if it isn't one */
+
+static int
+get_long(PyObject *v, long *p)
+{
+ long x = PyInt_AsLong(v);
+ if (x == -1 && PyErr_Occurred()) {
+ if (PyErr_ExceptionMatches(PyExc_TypeError))
+ PyErr_SetString(StructError,
+ "required argument is not an integer");
+ return -1;
+ }
+ *p = x;
+ return 0;
+}
+
+
+/* Same, but handling unsigned long */
+
+static int
+get_ulong(PyObject *v, unsigned long *p)
+{
+ if (PyLong_Check(v)) {
+ unsigned long x = PyLong_AsUnsignedLong(v);
+ if (x == (unsigned long)(-1) && PyErr_Occurred())
+ return -1;
+ *p = x;
+ return 0;
+ }
+ if (get_long(v, (long *)p) < 0)
+ return -1;
+ if (((long)*p) < 0) {
+ PyErr_SetString(StructError,
+ "unsigned argument is < 0");
+ return -1;
+ }
+ return 0;
+}
+
+#ifdef HAVE_LONG_LONG
+
+/* Same, but handling native long long. */
+
+static int
+get_longlong(PyObject *v, PY_LONG_LONG *p)
+{
+ PY_LONG_LONG x;
+
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ assert(PyLong_Check(v));
+ x = PyLong_AsLongLong(v);
+ Py_DECREF(v);
+ if (x == (PY_LONG_LONG)-1 && PyErr_Occurred())
+ return -1;
+ *p = x;
+ return 0;
+}
+
+/* Same, but handling native unsigned long long. */
+
+static int
+get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p)
+{
+ unsigned PY_LONG_LONG x;
+
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ assert(PyLong_Check(v));
+ x = PyLong_AsUnsignedLongLong(v);
+ Py_DECREF(v);
+ if (x == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())
+ return -1;
+ *p = x;
+ return 0;
+}
+
+#endif
+
+/* Floating point helpers */
+
+static PyObject *
+unpack_float(const char *p, /* start of 4-byte string */
+ int le) /* true for little-endian, false for big-endian */
+{
+ double x;
+
+ x = _PyFloat_Unpack4((unsigned char *)p, le);
+ if (x == -1.0 && PyErr_Occurred())
+ return NULL;
+ return PyFloat_FromDouble(x);
+}
+
+static PyObject *
+unpack_double(const char *p, /* start of 8-byte string */
+ int le) /* true for little-endian, false for big-endian */
+{
+ double x;
+
+ x = _PyFloat_Unpack8((unsigned char *)p, le);
+ if (x == -1.0 && PyErr_Occurred())
+ return NULL;
+ return PyFloat_FromDouble(x);
+}
+
+/* Helper to format the range error exceptions */
+static int
+_range_error(char format, Py_ssize_t size, int is_unsigned)
+{
+ if (is_unsigned == 0) {
+ long smallest = 0, largest = 0;
+ Py_ssize_t i = size * 8;
+ while (--i > 0) {
+ smallest = (smallest * 2) - 1;
+ largest = (largest * 2) + 1;
+ }
+ PyErr_Format(StructError,
+ "'%c' format requires %ld <= number <= %ld",
+ format,
+ smallest,
+ largest);
+ } else {
+ unsigned long largest = 0;
+ Py_ssize_t i = size * 8;
+ while (--i >= 0)
+ largest = (largest * 2) + 1;
+ PyErr_Format(StructError,
+ "'%c' format requires 0 <= number <= %lu",
+ format,
+ largest);
+ }
+ return -1;
+}
+
+
+
+/* A large number of small routines follow, with names of the form
+
+ [bln][up]_TYPE
+
+ [bln] distiguishes among big-endian, little-endian and native.
+ [pu] distiguishes between pack (to struct) and unpack (from struct).
+ TYPE is one of char, byte, ubyte, etc.
+*/
+
+/* Native mode routines. ****************************************************/
+/* NOTE:
+ In all n[up]_<type> routines handling types larger than 1 byte, there is
+ *no* guarantee that the p pointer is properly aligned for each type,
+ therefore memcpy is called. An intermediate variable is used to
+ compensate for big-endian architectures.
+ Normally both the intermediate variable and the memcpy call will be
+ skipped by C optimisation in little-endian architectures (gcc >= 2.91
+ does this). */
+
+static PyObject *
+nu_char(const char *p, const formatdef *f)
+{
+ return PyString_FromStringAndSize(p, 1);
+}
+
+static PyObject *
+nu_byte(const char *p, const formatdef *f)
+{
+ return PyInt_FromLong((long) *(signed char *)p);
+}
+
+static PyObject *
+nu_ubyte(const char *p, const formatdef *f)
+{
+ return PyInt_FromLong((long) *(unsigned char *)p);
+}
+
+static PyObject *
+nu_short(const char *p, const formatdef *f)
+{
+ short x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyInt_FromLong((long)x);
+}
+
+static PyObject *
+nu_ushort(const char *p, const formatdef *f)
+{
+ unsigned short x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyInt_FromLong((long)x);
+}
+
+static PyObject *
+nu_int(const char *p, const formatdef *f)
+{
+ int x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyInt_FromLong((long)x);
+}
+
+static PyObject *
+nu_uint(const char *p, const formatdef *f)
+{
+ unsigned int x;
+ memcpy((char *)&x, p, sizeof x);
+#if (SIZEOF_LONG > SIZEOF_INT)
+ return PyInt_FromLong((long)x);
+#else
+ if (x <= ((unsigned int)LONG_MAX))
+ return PyInt_FromLong((long)x);
+ return PyLong_FromUnsignedLong((unsigned long)x);
+#endif
+}
+
+static PyObject *
+nu_long(const char *p, const formatdef *f)
+{
+ long x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyInt_FromLong(x);
+}
+
+static PyObject *
+nu_ulong(const char *p, const formatdef *f)
+{
+ unsigned long x;
+ memcpy((char *)&x, p, sizeof x);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong((long)x);
+ return PyLong_FromUnsignedLong(x);
+}
+
+/* Native mode doesn't support q or Q unless the platform C supports
+ long long (or, on Windows, __int64). */
+
+#ifdef HAVE_LONG_LONG
+
+static PyObject *
+nu_longlong(const char *p, const formatdef *f)
+{
+ PY_LONG_LONG x;
+ memcpy((char *)&x, p, sizeof x);
+ if (x >= LONG_MIN && x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));
+ return PyLong_FromLongLong(x);
+}
+
+static PyObject *
+nu_ulonglong(const char *p, const formatdef *f)
+{
+ unsigned PY_LONG_LONG x;
+ memcpy((char *)&x, p, sizeof x);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));
+ return PyLong_FromUnsignedLongLong(x);
+}
+
+#endif
+
+static PyObject *
+nu_float(const char *p, const formatdef *f)
+{
+ float x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyFloat_FromDouble((double)x);
+}
+
+static PyObject *
+nu_double(const char *p, const formatdef *f)
+{
+ double x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyFloat_FromDouble(x);
+}
+
+static PyObject *
+nu_void_p(const char *p, const formatdef *f)
+{
+ void *x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyLong_FromVoidPtr(x);
+}
+
+static int
+np_byte(char *p, PyObject *v, const formatdef *f)
+{
+ long x;
+ if (get_long(v, &x) < 0)
+ return -1;
+ if (x < -128 || x > 127){
+ PyErr_SetString(StructError,
+ "byte format requires -128 <= number <= 127");
+ return -1;
+ }
+ *p = (char)x;
+ return 0;
+}
+
+static int
+np_ubyte(char *p, PyObject *v, const formatdef *f)
+{
+ long x;
+ if (get_long(v, &x) < 0)
+ return -1;
+ if (x < 0 || x > 255){
+ PyErr_SetString(StructError,
+ "ubyte format requires 0 <= number <= 255");
+ return -1;
+ }
+ *p = (char)x;
+ return 0;
+}
+
+static int
+np_char(char *p, PyObject *v, const formatdef *f)
+{
+ if (!PyString_Check(v) || PyString_Size(v) != 1) {
+ PyErr_SetString(StructError,
+ "char format require string of length 1");
+ return -1;
+ }
+ *p = *PyString_AsString(v);
+ return 0;
+}
+
+static int
+np_short(char *p, PyObject *v, const formatdef *f)
+{
+ long x;
+ short y;
+ if (get_long(v, &x) < 0)
+ return -1;
+ if (x < SHRT_MIN || x > SHRT_MAX){
+ PyErr_SetString(StructError,
+ "short format requires " STRINGIFY(SHRT_MIN)
+ " <= number <= " STRINGIFY(SHRT_MAX));
+ return -1;
+ }
+ y = (short)x;
+ memcpy(p, (char *)&y, sizeof y);
+ return 0;
+}
+
+static int
+np_ushort(char *p, PyObject *v, const formatdef *f)
+{
+ long x;
+ unsigned short y;
+ if (get_long(v, &x) < 0)
+ return -1;
+ if (x < 0 || x > USHRT_MAX){
+ PyErr_SetString(StructError,
+ "short format requires 0 <= number <= " STRINGIFY(USHRT_MAX));
+ return -1;
+ }
+ y = (unsigned short)x;
+ memcpy(p, (char *)&y, sizeof y);
+ return 0;
+}
+
+static int
+np_int(char *p, PyObject *v, const formatdef *f)
+{
+ long x;
+ int y;
+ if (get_long(v, &x) < 0)
+ return -1;
+#if (SIZEOF_LONG > SIZEOF_INT)
+ if ((x < ((long)INT_MIN)) || (x > ((long)INT_MAX)))
+ return _range_error(f->format, sizeof(y), 0);
+#endif
+ y = (int)x;
+ memcpy(p, (char *)&y, sizeof y);
+ return 0;
+}
+
+static int
+np_uint(char *p, PyObject *v, const formatdef *f)
+{
+ unsigned long x;
+ unsigned int y;
+ if (get_ulong(v, &x) < 0)
+ return _range_error(f->format, sizeof(y), 1);
+ y = (unsigned int)x;
+#if (SIZEOF_LONG > SIZEOF_INT)
+ if (x > ((unsigned long)UINT_MAX))
+ return _range_error(f->format, sizeof(y), 1);
+#endif
+ memcpy(p, (char *)&y, sizeof y);
+ return 0;
+}
+
+static int
+np_long(char *p, PyObject *v, const formatdef *f)
+{
+ long x;
+ if (get_long(v, &x) < 0)
+ return -1;
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+}
+
+static int
+np_ulong(char *p, PyObject *v, const formatdef *f)
+{
+ unsigned long x;
+ if (get_ulong(v, &x) < 0)
+ return _range_error(f->format, sizeof(x), 1);
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+}
+
+#ifdef HAVE_LONG_LONG
+
+static int
+np_longlong(char *p, PyObject *v, const formatdef *f)
+{
+ PY_LONG_LONG x;
+ if (get_longlong(v, &x) < 0)
+ return -1;
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+}
+
+static int
+np_ulonglong(char *p, PyObject *v, const formatdef *f)
+{
+ unsigned PY_LONG_LONG x;
+ if (get_ulonglong(v, &x) < 0)
+ return -1;
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+}
+#endif
+
+static int
+np_float(char *p, PyObject *v, const formatdef *f)
+{
+ float x = (float)PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+}
+
+static int
+np_double(char *p, PyObject *v, const formatdef *f)
+{
+ double x = PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ memcpy(p, (char *)&x, sizeof(double));
+ return 0;
+}
+
+static int
+np_void_p(char *p, PyObject *v, const formatdef *f)
+{
+ void *x;
+
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ assert(PyLong_Check(v));
+ x = PyLong_AsVoidPtr(v);
+ Py_DECREF(v);
+ if (x == NULL && PyErr_Occurred())
+ return -1;
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+}
+
+static formatdef native_table[] = {
+ {'x', sizeof(char), 0, NULL},
+ {'b', sizeof(char), 0, nu_byte, np_byte},
+ {'B', sizeof(char), 0, nu_ubyte, np_ubyte},
+ {'c', sizeof(char), 0, nu_char, np_char},
+ {'s', sizeof(char), 0, NULL},
+ {'p', sizeof(char), 0, NULL},
+ {'h', sizeof(short), SHORT_ALIGN, nu_short, np_short},
+ {'H', sizeof(short), SHORT_ALIGN, nu_ushort, np_ushort},
+ {'i', sizeof(int), INT_ALIGN, nu_int, np_int},
+ {'I', sizeof(int), INT_ALIGN, nu_uint, np_uint},
+ {'l', sizeof(long), LONG_ALIGN, nu_long, np_long},
+ {'L', sizeof(long), LONG_ALIGN, nu_ulong, np_ulong},
+#ifdef HAVE_LONG_LONG
+ {'q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_longlong, np_longlong},
+ {'Q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_ulonglong,np_ulonglong},
+#endif
+ {'f', sizeof(float), FLOAT_ALIGN, nu_float, np_float},
+ {'d', sizeof(double), DOUBLE_ALIGN, nu_double, np_double},
+ {'P', sizeof(void *), VOID_P_ALIGN, nu_void_p, np_void_p},
+ {0}
+};
+
+/* Big-endian routines. *****************************************************/
+
+static PyObject *
+bu_int(const char *p, const formatdef *f)
+{
+ long x = 0;
+ Py_ssize_t i = f->size;
+ do {
+ x = (x<<8) | (*p++ & 0xFF);
+ } while (--i > 0);
+ /* Extend the sign bit. */
+ if (SIZEOF_LONG > f->size)
+ x |= -(x & (1L << ((8 * f->size) - 1)));
+ return PyInt_FromLong(x);
+}
+
+static PyObject *
+bu_uint(const char *p, const formatdef *f)
+{
+ unsigned long x = 0;
+ Py_ssize_t i = f->size;
+ do {
+ x = (x<<8) | (*p++ & 0xFF);
+ } while (--i > 0);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong((long)x);
+ return PyLong_FromUnsignedLong(x);
+}
+
+static PyObject *
+bu_longlong(const char *p, const formatdef *f)
+{
+#ifdef HAVE_LONG_LONG
+ PY_LONG_LONG x = 0;
+ Py_ssize_t i = f->size;
+ do {
+ x = (x<<8) | (*p++ & 0xFF);
+ } while (--i > 0);
+ /* Extend the sign bit. */
+ if (SIZEOF_LONG_LONG > f->size)
+ x |= -(x & (1L << ((8 * f->size) - 1)));
+ if (x >= LONG_MIN && x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));
+ return PyLong_FromLongLong(x);
+#else
+ return _PyLong_FromByteArray((const unsigned char *)p,
+ 8,
+ 0, /* little-endian */
+ 1 /* signed */);
+#endif
+}
+
+static PyObject *
+bu_ulonglong(const char *p, const formatdef *f)
+{
+#ifdef HAVE_LONG_LONG
+ unsigned PY_LONG_LONG x = 0;
+ Py_ssize_t i = f->size;
+ do {
+ x = (x<<8) | (*p++ & 0xFF);
+ } while (--i > 0);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));
+ return PyLong_FromUnsignedLongLong(x);
+#else
+ return _PyLong_FromByteArray((const unsigned char *)p,
+ 8,
+ 0, /* little-endian */
+ 0 /* signed */);
+#endif
+}
+
+static PyObject *
+bu_float(const char *p, const formatdef *f)
+{
+ return unpack_float(p, 0);
+}
+
+static PyObject *
+bu_double(const char *p, const formatdef *f)
+{
+ return unpack_double(p, 0);
+}
+
+static int
+bp_int(char *p, PyObject *v, const formatdef *f)
+{
+ long x;
+ Py_ssize_t i;
+ if (get_long(v, &x) < 0)
+ return -1;
+ i = f->size;
+ if (i != SIZEOF_LONG) {
+ if ((i == 2) && (x < -32768 || x > 32767))
+ return _range_error(f->format, i, 0);
+#if (SIZEOF_LONG != 4)
+ else if ((i == 4) && (x < -2147483648L || x > 2147483647L))
+ return _range_error(f->format, i, 0);
+#endif
+ }
+ do {
+ p[--i] = (char)x;
+ x >>= 8;
+ } while (i > 0);
+ return 0;
+}
+
+static int
+bp_uint(char *p, PyObject *v, const formatdef *f)
+{
+ unsigned long x;
+ Py_ssize_t i;
+ if (get_ulong(v, &x) < 0)
+ return -1;
+ i = f->size;
+ if (i != SIZEOF_LONG) {
+ unsigned long maxint = 1;
+ maxint <<= (unsigned long)(i * 8);
+ if (x >= maxint)
+ return _range_error(f->format, f->size, 1);
+ }
+ do {
+ p[--i] = (char)x;
+ x >>= 8;
+ } while (i > 0);
+ return 0;
+}
+
+static int
+bp_longlong(char *p, PyObject *v, const formatdef *f)
+{
+ int res;
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ res = _PyLong_AsByteArray((PyLongObject *)v,
+ (unsigned char *)p,
+ 8,
+ 0, /* little_endian */
+ 1 /* signed */);
+ Py_DECREF(v);
+ return res;
+}
+
+static int
+bp_ulonglong(char *p, PyObject *v, const formatdef *f)
+{
+ int res;
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ res = _PyLong_AsByteArray((PyLongObject *)v,
+ (unsigned char *)p,
+ 8,
+ 0, /* little_endian */
+ 0 /* signed */);
+ Py_DECREF(v);
+ return res;
+}
+
+static int
+bp_float(char *p, PyObject *v, const formatdef *f)
+{
+ double x = PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ return _PyFloat_Pack4(x, (unsigned char *)p, 0);
+}
+
+static int
+bp_double(char *p, PyObject *v, const formatdef *f)
+{
+ double x = PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ return _PyFloat_Pack8(x, (unsigned char *)p, 0);
+}
+
+static formatdef bigendian_table[] = {
+ {'x', 1, 0, NULL},
+ {'b', 1, 0, nu_byte, np_byte},
+ {'B', 1, 0, nu_ubyte, np_ubyte},
+ {'c', 1, 0, nu_char, np_char},
+ {'s', 1, 0, NULL},
+ {'p', 1, 0, NULL},
+ {'h', 2, 0, bu_int, bp_int},
+ {'H', 2, 0, bu_uint, bp_uint},
+ {'i', 4, 0, bu_int, bp_int},
+ {'I', 4, 0, bu_uint, bp_uint},
+ {'l', 4, 0, bu_int, bp_int},
+ {'L', 4, 0, bu_uint, bp_uint},
+ {'q', 8, 0, bu_longlong, bp_longlong},
+ {'Q', 8, 0, bu_ulonglong, bp_ulonglong},
+ {'f', 4, 0, bu_float, bp_float},
+ {'d', 8, 0, bu_double, bp_double},
+ {0}
+};
+
+/* Little-endian routines. *****************************************************/
+
+static PyObject *
+lu_int(const char *p, const formatdef *f)
+{
+ long x = 0;
+ Py_ssize_t i = f->size;
+ do {
+ x = (x<<8) | (p[--i] & 0xFF);
+ } while (i > 0);
+ /* Extend the sign bit. */
+ if (SIZEOF_LONG > f->size)
+ x |= -(x & (1L << ((8 * f->size) - 1)));
+ return PyInt_FromLong(x);
+}
+
+static PyObject *
+lu_uint(const char *p, const formatdef *f)
+{
+ unsigned long x = 0;
+ Py_ssize_t i = f->size;
+ do {
+ x = (x<<8) | (p[--i] & 0xFF);
+ } while (i > 0);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong((long)x);
+ return PyLong_FromUnsignedLong((long)x);
+}
+
+static PyObject *
+lu_longlong(const char *p, const formatdef *f)
+{
+#ifdef HAVE_LONG_LONG
+ PY_LONG_LONG x = 0;
+ Py_ssize_t i = f->size;
+ do {
+ x = (x<<8) | (p[--i] & 0xFF);
+ } while (i > 0);
+ /* Extend the sign bit. */
+ if (SIZEOF_LONG_LONG > f->size)
+ x |= -(x & (1L << ((8 * f->size) - 1)));
+ if (x >= LONG_MIN && x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));
+ return PyLong_FromLongLong(x);
+#else
+ return _PyLong_FromByteArray((const unsigned char *)p,
+ 8,
+ 1, /* little-endian */
+ 1 /* signed */);
+#endif
+}
+
+static PyObject *
+lu_ulonglong(const char *p, const formatdef *f)
+{
+#ifdef HAVE_LONG_LONG
+ unsigned PY_LONG_LONG x = 0;
+ Py_ssize_t i = f->size;
+ do {
+ x = (x<<8) | (p[--i] & 0xFF);
+ } while (i > 0);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));
+ return PyLong_FromUnsignedLongLong(x);
+#else
+ return _PyLong_FromByteArray((const unsigned char *)p,
+ 8,
+ 1, /* little-endian */
+ 0 /* signed */);
+#endif
+}
+
+static PyObject *
+lu_float(const char *p, const formatdef *f)
+{
+ return unpack_float(p, 1);
+}
+
+static PyObject *
+lu_double(const char *p, const formatdef *f)
+{
+ return unpack_double(p, 1);
+}
+
+static int
+lp_int(char *p, PyObject *v, const formatdef *f)
+{
+ long x;
+ Py_ssize_t i;
+ if (get_long(v, &x) < 0)
+ return -1;
+ i = f->size;
+ if (i != SIZEOF_LONG) {
+ if ((i == 2) && (x < -32768 || x > 32767))
+ return _range_error(f->format, i, 0);
+#if (SIZEOF_LONG != 4)
+ else if ((i == 4) && (x < -2147483648L || x > 2147483647L))
+ return _range_error(f->format, i, 0);
+#endif
+ }
+ do {
+ *p++ = (char)x;
+ x >>= 8;
+ } while (--i > 0);
+ return 0;
+}
+
+static int
+lp_uint(char *p, PyObject *v, const formatdef *f)
+{
+ unsigned long x;
+ Py_ssize_t i;
+ if (get_ulong(v, &x) < 0)
+ return -1;
+ i = f->size;
+ if (i != SIZEOF_LONG) {
+ unsigned long maxint = 1;
+ maxint <<= (unsigned long)(i * 8);
+ if (x >= maxint)
+ return _range_error(f->format, f->size, 1);
+ }
+ do {
+ *p++ = (char)x;
+ x >>= 8;
+ } while (--i > 0);
+ return 0;
+}
+
+static int
+lp_longlong(char *p, PyObject *v, const formatdef *f)
+{
+ int res;
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ res = _PyLong_AsByteArray((PyLongObject*)v,
+ (unsigned char *)p,
+ 8,
+ 1, /* little_endian */
+ 1 /* signed */);
+ Py_DECREF(v);
+ return res;
+}
+
+static int
+lp_ulonglong(char *p, PyObject *v, const formatdef *f)
+{
+ int res;
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ res = _PyLong_AsByteArray((PyLongObject*)v,
+ (unsigned char *)p,
+ 8,
+ 1, /* little_endian */
+ 0 /* signed */);
+ Py_DECREF(v);
+ return res;
+}
+
+static int
+lp_float(char *p, PyObject *v, const formatdef *f)
+{
+ double x = PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ return _PyFloat_Pack4(x, (unsigned char *)p, 1);
+}
+
+static int
+lp_double(char *p, PyObject *v, const formatdef *f)
+{
+ double x = PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ return _PyFloat_Pack8(x, (unsigned char *)p, 1);
+}
+
+static formatdef lilendian_table[] = {
+ {'x', 1, 0, NULL},
+ {'b', 1, 0, nu_byte, np_byte},
+ {'B', 1, 0, nu_ubyte, np_ubyte},
+ {'c', 1, 0, nu_char, np_char},
+ {'s', 1, 0, NULL},
+ {'p', 1, 0, NULL},
+ {'h', 2, 0, lu_int, lp_int},
+ {'H', 2, 0, lu_uint, lp_uint},
+ {'i', 4, 0, lu_int, lp_int},
+ {'I', 4, 0, lu_uint, lp_uint},
+ {'l', 4, 0, lu_int, lp_int},
+ {'L', 4, 0, lu_uint, lp_uint},
+ {'q', 8, 0, lu_longlong, lp_longlong},
+ {'Q', 8, 0, lu_ulonglong, lp_ulonglong},
+ {'f', 4, 0, lu_float, lp_float},
+ {'d', 8, 0, lu_double, lp_double},
+ {0}
+};
+
+
+static const formatdef *
+whichtable(char **pfmt)
+{
+ const char *fmt = (*pfmt)++; /* May be backed out of later */
+ switch (*fmt) {
+ case '<':
+ return lilendian_table;
+ case '>':
+ case '!': /* Network byte order is big-endian */
+ return bigendian_table;
+ case '=': { /* Host byte order -- different from native in aligment! */
+ int n = 1;
+ char *p = (char *) &n;
+ if (*p == 1)
+ return lilendian_table;
+ else
+ return bigendian_table;
+ }
+ default:
+ --*pfmt; /* Back out of pointer increment */
+ /* Fall through */
+ case '@':
+ return native_table;
+ }
+}
+
+
+/* Get the table entry for a format code */
+
+static const formatdef *
+getentry(int c, const formatdef *f)
+{
+ for (; f->format != '\0'; f++) {
+ if (f->format == c) {
+ return f;
+ }
+ }
+ PyErr_SetString(StructError, "bad char in struct format");
+ return NULL;
+}
+
+
+/* Align a size according to a format code */
+
+static int
+align(Py_ssize_t size, char c, const formatdef *e)
+{
+ if (e->format == c) {
+ if (e->alignment) {
+ size = ((size + e->alignment - 1)
+ / e->alignment)
+ * e->alignment;
+ }
+ }
+ return size;
+}
+
+
+/* calculate the size of a format string */
+
+static int
+prepare_s(PyStructObject *self)
+{
+ const formatdef *f;
+ const formatdef *e;
+ formatcode *codes;
+
+ const char *s;
+ const char *fmt;
+ char c;
+ Py_ssize_t size, len, num, itemsize, x;
+
+ fmt = PyString_AS_STRING(self->s_format);
+
+ f = whichtable((char **)&fmt);
+
+ s = fmt;
+ size = 0;
+ len = 0;
+ while ((c = *s++) != '\0') {
+ if (isspace(Py_CHARMASK(c)))
+ continue;
+ if ('0' <= c && c <= '9') {
+ num = c - '0';
+ while ('0' <= (c = *s++) && c <= '9') {
+ x = num*10 + (c - '0');
+ if (x/10 != num) {
+ PyErr_SetString(
+ StructError,
+ "overflow in item count");
+ return -1;
+ }
+ num = x;
+ }
+ if (c == '\0')
+ break;
+ }
+ else
+ num = 1;
+
+ e = getentry(c, f);
+ if (e == NULL)
+ return -1;
+
+ switch (c) {
+ case 's': /* fall through */
+ case 'p': len++; break;
+ case 'x': break;
+ default: len += num; break;
+ }
+
+ itemsize = e->size;
+ size = align(size, c, e);
+ x = num * itemsize;
+ size += x;
+ if (x/itemsize != num || size < 0) {
+ PyErr_SetString(StructError,
+ "total struct size too long");
+ return -1;
+ }
+ }
+
+ self->s_size = size;
+ self->s_len = len;
+ codes = PyMem_MALLOC((len + 1) * sizeof(formatcode));
+ if (codes == NULL) {
+ PyErr_NoMemory();
+ return -1;
+ }
+ self->s_codes = codes;
+
+ s = fmt;
+ size = 0;
+ while ((c = *s++) != '\0') {
+ if (isspace(Py_CHARMASK(c)))
+ continue;
+ if ('0' <= c && c <= '9') {
+ num = c - '0';
+ while ('0' <= (c = *s++) && c <= '9')
+ num = num*10 + (c - '0');
+ if (c == '\0')
+ break;
+ }
+ else
+ num = 1;
+
+ e = getentry(c, f);
+
+ size = align(size, c, e);
+ if (c == 's' || c == 'p') {
+ codes->offset = size;
+ codes->size = num;
+ codes->fmtdef = e;
+ codes++;
+ size += num;
+ } else if (c == 'x') {
+ size += num;
+ } else {
+ while (--num >= 0) {
+ codes->offset = size;
+ codes->size = e->size;
+ codes->fmtdef = e;
+ codes++;
+ size += e->size;
+ }
+ }
+ }
+ codes->fmtdef = NULL;
+ codes->offset = size;
+ codes->size = 0;
+
+ return 0;
+}
+
+static PyObject *
+s_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+ PyObject *self;
+
+ assert(type != NULL && type->tp_alloc != NULL);
+
+ self = type->tp_alloc(type, 0);
+ if (self != NULL) {
+ PyStructObject *s = (PyStructObject*)self;
+ Py_INCREF(Py_None);
+ s->s_format = Py_None;
+ s->s_codes = NULL;
+ s->s_size = -1;
+ s->s_len = -1;
+ }
+ return self;
+}
+
+static int
+s_init(PyObject *self, PyObject *args, PyObject *kwds)
+{
+ PyStructObject *soself = (PyStructObject *)self;
+ PyObject *o_format = NULL;
+ int ret = 0;
+ static char *kwlist[] = {"format", 0};
+
+ assert(PyStruct_Check(self));
+
+ if (!PyArg_ParseTupleAndKeywords(args, kwds, "S:Struct", kwlist,
+ &o_format))
+ return -1;
+
+ Py_INCREF(o_format);
+ Py_XDECREF(soself->s_format);
+ soself->s_format = o_format;
+
+ ret = prepare_s(soself);
+ return ret;
+}
+
+static void
+s_dealloc(PyStructObject *s)
+{
+ if (s->weakreflist != NULL)
+ PyObject_ClearWeakRefs((PyObject *)s);
+ if (s->s_codes != NULL) {
+ PyMem_FREE(s->s_codes);
+ }
+ Py_XDECREF(s->s_format);
+ s->ob_type->tp_free((PyObject *)s);
+}
+
+static PyObject *
+s_unpack_internal(PyStructObject *soself, char *startfrom) {
+ formatcode *code;
+ Py_ssize_t i = 0;
+ PyObject *result = PyTuple_New(soself->s_len);
+ if (result == NULL)
+ return NULL;
+
+ for (code = soself->s_codes; code->fmtdef != NULL; code++) {
+ PyObject *v;
+ const formatdef *e = code->fmtdef;
+ const char *res = startfrom + code->offset;
+ if (e->format == 's') {
+ v = PyString_FromStringAndSize(res, code->size);
+ if (v == NULL)
+ goto fail;
+ PyTuple_SET_ITEM(result, i++, v);
+ } else if (e->format == 'p') {
+ Py_ssize_t n = *(unsigned char*)res;
+ if (n >= code->size)
+ n = code->size - 1;
+ v = PyString_FromStringAndSize(res + 1, n);
+ if (v == NULL)
+ goto fail;
+ PyTuple_SET_ITEM(result, i++, v);
+ } else {
+ v = e->unpack(res, e);
+ if (v == NULL)
+ goto fail;
+ PyTuple_SET_ITEM(result, i++, v);
+ }
+ }
+
+ return result;
+fail:
+ Py_DECREF(result);
+ return NULL;
+}
+
+
+PyDoc_STRVAR(s_unpack__doc__,
+"S.unpack(str) -> (v1, v2, ...)\n\
+\n\
+Return tuple containing values unpacked according to this Struct's format.\n\
+Requires len(str) == self.size. See struct.__doc__ for more on format\n\
+strings.");
+
+static PyObject *
+s_unpack(PyObject *self, PyObject *inputstr)
+{
+ PyStructObject *soself = (PyStructObject *)self;
+ assert(PyStruct_Check(self));
+ assert(soself->s_codes != NULL);
+ if (inputstr == NULL || !PyString_Check(inputstr) ||
+ PyString_GET_SIZE(inputstr) != soself->s_size) {
+ PyErr_Format(StructError,
+ "unpack requires a string argument of length %zd", soself->s_size);
+ return NULL;
+ }
+ return s_unpack_internal(soself, PyString_AS_STRING(inputstr));
+}
+
+PyDoc_STRVAR(s_unpack_from__doc__,
+"S.unpack_from(buffer[, offset]) -> (v1, v2, ...)\n\
+\n\
+Return tuple containing values unpacked according to this Struct's format.\n\
+Unlike unpack, unpack_from can unpack values from any object supporting\n\
+the buffer API, not just str. Requires len(buffer[offset:]) >= self.size.\n\
+See struct.__doc__ for more on format strings.");
+
+static PyObject *
+s_unpack_from(PyObject *self, PyObject *args, PyObject *kwds)
+{
+ static char *kwlist[] = {"buffer", "offset", 0};
+#if (PY_VERSION_HEX < 0x02050000)
+ static char *fmt = "z#|i:unpack_from";
+#else
+ static char *fmt = "z#|n:unpack_from";
+#endif
+ Py_ssize_t buffer_len = 0, offset = 0;
+ char *buffer = NULL;
+ PyStructObject *soself = (PyStructObject *)self;
+ assert(PyStruct_Check(self));
+ assert(soself->s_codes != NULL);
+
+ if (!PyArg_ParseTupleAndKeywords(args, kwds, fmt, kwlist,
+ &buffer, &buffer_len, &offset))
+ return NULL;
+
+ if (buffer == NULL) {
+ PyErr_Format(StructError,
+ "unpack_from requires a buffer argument");
+ return NULL;
+ }
+
+ if (offset < 0)
+ offset += buffer_len;
+
+ if (offset < 0 || (buffer_len - offset) < soself->s_size) {
+ PyErr_Format(StructError,
+ "unpack_from requires a buffer of at least %zd bytes",
+ soself->s_size);
+ return NULL;
+ }
+ return s_unpack_internal(soself, buffer + offset);
+}
+
+
+/*
+ * Guts of the pack function.
+ *
+ * Takes a struct object, a tuple of arguments, and offset in that tuple of
+ * argument for where to start processing the arguments for packing, and a
+ * character buffer for writing the packed string. The caller must insure
+ * that the buffer may contain the required length for packing the arguments.
+ * 0 is returned on success, 1 is returned if there is an error.
+ *
+ */
+static int
+s_pack_internal(PyStructObject *soself, PyObject *args, int offset, char* buf)
+{
+ formatcode *code;
+ Py_ssize_t i;
+
+ memset(buf, '\0', soself->s_size);
+ i = offset;
+ for (code = soself->s_codes; code->fmtdef != NULL; code++) {
+ Py_ssize_t n;
+ PyObject *v;
+ const formatdef *e = code->fmtdef;
+ char *res = buf + code->offset;
+ if (e->format == 's') {
+ v = PyTuple_GET_ITEM(args, i++);
+ if (!PyString_Check(v)) {
+ PyErr_SetString(StructError,
+ "argument for 's' must be a string");
+ return -1;
+ }
+ n = PyString_GET_SIZE(v);
+ if (n > code->size)
+ n = code->size;
+ if (n > 0)
+ memcpy(res, PyString_AS_STRING(v), n);
+ } else if (e->format == 'p') {
+ v = PyTuple_GET_ITEM(args, i++);
+ if (!PyString_Check(v)) {
+ PyErr_SetString(StructError,
+ "argument for 'p' must be a string");
+ return -1;
+ }
+ n = PyString_GET_SIZE(v);
+ if (n > (code->size - 1))
+ n = code->size - 1;
+ if (n > 0)
+ memcpy(res + 1, PyString_AS_STRING(v), n);
+ if (n > 255)
+ n = 255;
+ *res = Py_SAFE_DOWNCAST(n, Py_ssize_t, unsigned char);
+ } else {
+ v = PyTuple_GET_ITEM(args, i++);
+ if (e->pack(res, v, e) < 0)
+ return -1;
+ }
+ }
+
+ /* Success */
+ return 0;
+}
+
+
+PyDoc_STRVAR(s_pack__doc__,
+"S.pack(v1, v2, ...) -> string\n\
+\n\
+Return a string containing values v1, v2, ... packed according to this\n\
+Struct's format. See struct.__doc__ for more on format strings.");
+
+static PyObject *
+s_pack(PyObject *self, PyObject *args)
+{
+ PyStructObject *soself;
+ PyObject *result;
+
+ /* Validate arguments. */
+ soself = (PyStructObject *)self;
+ assert(PyStruct_Check(self));
+ assert(soself->s_codes != NULL);
+ if (args == NULL || !PyTuple_Check(args) ||
+ PyTuple_GET_SIZE(args) != soself->s_len)
+ {
+ PyErr_Format(StructError,
+ "pack requires exactly %zd arguments", soself->s_len);
+ return NULL;
+ }
+
+ /* Allocate a new string */
+ result = PyString_FromStringAndSize((char *)NULL, soself->s_size);
+ if (result == NULL)
+ return NULL;
+
+ /* Call the guts */
+ if ( s_pack_internal(soself, args, 0, PyString_AS_STRING(result)) != 0 ) {
+ Py_DECREF(result);
+ return NULL;
+ }
+
+ return result;
+}
+
+PyDoc_STRVAR(s_pack_to__doc__,
+"S.pack_to(buffer, offset, v1, v2, ...)\n\
+\n\
+Pack the values v2, v2, ... according to this Struct's format, write \n\
+the packed bytes into the writable buffer buf starting at offset. Note\n\
+that the offset is not an optional argument. See struct.__doc__ for \n\
+more on format strings.");
+
+static PyObject *
+s_pack_to(PyObject *self, PyObject *args)
+{
+ PyStructObject *soself;
+ char *buffer;
+ Py_ssize_t buffer_len, offset;
+
+ /* Validate arguments. +1 is for the first arg as buffer. */
+ soself = (PyStructObject *)self;
+ assert(PyStruct_Check(self));
+ assert(soself->s_codes != NULL);
+ if (args == NULL || !PyTuple_Check(args) ||
+ PyTuple_GET_SIZE(args) != (soself->s_len + 2))
+ {
+ PyErr_Format(StructError,
+ "pack_to requires exactly %zd arguments",
+ (soself->s_len + 2));
+ return NULL;
+ }
+
+ /* Extract a writable memory buffer from the first argument */
+ if ( PyObject_AsWriteBuffer(PyTuple_GET_ITEM(args, 0),
+ (void**)&buffer, &buffer_len) == -1 ) {
+ return NULL;
+ }
+ assert( buffer_len >= 0 );
+
+ /* Extract the offset from the first argument */
+ offset = PyInt_AsLong(PyTuple_GET_ITEM(args, 1));
+
+ /* Support negative offsets. */
+ if (offset < 0)
+ offset += buffer_len;
+
+ /* Check boundaries */
+ if (offset < 0 || (buffer_len - offset) < soself->s_size) {
+ PyErr_Format(StructError,
+ "pack_to requires a buffer of at least %zd bytes",
+ soself->s_size);
+ return NULL;
+ }
+
+ /* Call the guts */
+ if ( s_pack_internal(soself, args, 2, buffer + offset) != 0 ) {
+ return NULL;
+ }
+
+ return Py_None;
+}
+
+static PyObject *
+s_get_format(PyStructObject *self, void *unused)
+{
+ Py_INCREF(self->s_format);
+ return self->s_format;
+}
+
+static PyObject *
+s_get_size(PyStructObject *self, void *unused)
+{
+ return PyInt_FromSsize_t(self->s_size);
+}
+
+/* List of functions */
+
+static struct PyMethodDef s_methods[] = {
+ {"pack", (PyCFunction)s_pack, METH_VARARGS, s_pack__doc__},
+ {"pack_to", (PyCFunction)s_pack_to, METH_VARARGS, s_pack_to__doc__},
+ {"unpack", (PyCFunction)s_unpack, METH_O, s_unpack__doc__},
+ {"unpack_from", (PyCFunction)s_unpack_from, METH_KEYWORDS, s_unpack_from__doc__},
+ {NULL, NULL} /* sentinel */
+};
+
+PyDoc_STRVAR(s__doc__, "Compiled struct object");
+
+#define OFF(x) offsetof(PyStructObject, x)
+
+static PyGetSetDef s_getsetlist[] = {
+ {"format", (getter)s_get_format, (setter)NULL, "struct format string", NULL},
+ {"size", (getter)s_get_size, (setter)NULL, "struct size in bytes", NULL},
+ {NULL} /* sentinel */
+};
+
+static
+PyTypeObject PyStructType = {
+ PyObject_HEAD_INIT(NULL)
+ 0,
+ "Struct",
+ sizeof(PyStructObject),
+ 0,
+ (destructor)s_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 */
+ PyObject_GenericSetAttr, /* tp_setattro */
+ 0, /* tp_as_buffer */
+ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_WEAKREFS,/* tp_flags */
+ s__doc__, /* tp_doc */
+ 0, /* tp_traverse */
+ 0, /* tp_clear */
+ 0, /* tp_richcompare */
+ offsetof(PyStructObject, weakreflist), /* tp_weaklistoffset */
+ 0, /* tp_iter */
+ 0, /* tp_iternext */
+ s_methods, /* tp_methods */
+ NULL, /* tp_members */
+ s_getsetlist, /* tp_getset */
+ 0, /* tp_base */
+ 0, /* tp_dict */
+ 0, /* tp_descr_get */
+ 0, /* tp_descr_set */
+ 0, /* tp_dictoffset */
+ s_init, /* tp_init */
+ PyType_GenericAlloc,/* tp_alloc */
+ s_new, /* tp_new */
+ PyObject_Del, /* tp_free */
+};
+
+/* Module initialization */
+
+PyMODINIT_FUNC
+init_struct(void)
+{
+ PyObject *m = Py_InitModule("_struct", NULL);
+ if (m == NULL)
+ return;
+
+ PyStructType.ob_type = &PyType_Type;
+ if (PyType_Ready(&PyStructType) < 0)
+ return;
+
+ /* Check endian and swap in faster functions */
+ {
+ int one = 1;
+ formatdef *native = native_table;
+ formatdef *other, *ptr;
+ if ((int)*(unsigned char*)&one)
+ other = lilendian_table;
+ else
+ other = bigendian_table;
+ /* Scan through the native table, find a matching
+ entry in the endian table and swap in the
+ native implementations whenever possible
+ (64-bit platforms may not have "standard" sizes) */
+ while (native->format != '\0' && other->format != '\0') {
+ ptr = other;
+ while (ptr->format != '\0') {
+ if (ptr->format == native->format) {
+ /* Match faster when formats are
+ listed in the same order */
+ if (ptr == other)
+ other++;
+ /* Only use the trick if the
+ size matches */
+ if (ptr->size != native->size)
+ break;
+ /* Skip float and double, could be
+ "unknown" float format */
+ if (ptr->format == 'd' || ptr->format == 'f')
+ break;
+ ptr->pack = native->pack;
+ ptr->unpack = native->unpack;
+ break;
+ }
+ ptr++;
+ }
+ native++;
+ }
+ }
+
+ /* Add some symbolic constants to the module */
+ if (StructError == NULL) {
+ StructError = PyErr_NewException("struct.error", NULL, NULL);
+ if (StructError == NULL)
+ return;
+ }
+
+ Py_INCREF(StructError);
+ PyModule_AddObject(m, "error", StructError);
+
+ Py_INCREF((PyObject*)&PyStructType);
+ PyModule_AddObject(m, "Struct", (PyObject*)&PyStructType);
+}
generated by cgit v0.12 at 2024-11-17 08:42:50 (GMT)