diff options
Diffstat (limited to 'generic/tclBinary.c')
| -rw-r--r-- | generic/tclBinary.c | 2409 |
1 files changed, 1625 insertions, 784 deletions
diff --git a/generic/tclBinary.c b/generic/tclBinary.c index 68289f2..981f174 100644 --- a/generic/tclBinary.c +++ b/generic/tclBinary.c @@ -59,7 +59,7 @@ static void DupByteArrayInternalRep(Tcl_Obj *srcPtr, static int FormatNumber(Tcl_Interp *interp, int type, Tcl_Obj *src, unsigned char **cursorPtr); static void FreeByteArrayInternalRep(Tcl_Obj *objPtr); -static int GetFormatSpec(char **formatPtr, char *cmdPtr, +static int GetFormatSpec(const char **formatPtr, char *cmdPtr, int *countPtr, int *flagsPtr); static Tcl_Obj * ScanNumber(unsigned char *buffer, int type, int flags, Tcl_HashTable **numberCachePtr); @@ -69,7 +69,90 @@ static void UpdateStringOfByteArray(Tcl_Obj *listPtr); static void DeleteScanNumberCache(Tcl_HashTable *numberCachePtr); static int NeedReversing(int format); static void CopyNumber(const void *from, void *to, - unsigned int length, int type); + unsigned length, int type); +/* Binary ensemble commands */ +static int BinaryFormatCmd(ClientData clientData, + Tcl_Interp *interp, + int objc, Tcl_Obj *const objv[]); +static int BinaryScanCmd(ClientData clientData, + Tcl_Interp *interp, + int objc, Tcl_Obj *const objv[]); +/* Binary encoding sub-ensemble commands */ +static int BinaryEncodeHex(ClientData clientData, + Tcl_Interp *interp, + int objc, Tcl_Obj *const objv[]); +static int BinaryDecodeHex(ClientData clientData, + Tcl_Interp *interp, + int objc, Tcl_Obj *const objv[]); +static int BinaryEncode64(ClientData clientData, + Tcl_Interp *interp, + int objc, Tcl_Obj *const objv[]); +static int BinaryDecode64(ClientData clientData, + Tcl_Interp *interp, + int objc, Tcl_Obj *const objv[]); +static int BinaryEncodeUu(ClientData clientData, + Tcl_Interp *interp, int objc, + Tcl_Obj *const objv[]); +static int BinaryDecodeUu(ClientData clientData, + Tcl_Interp *interp, + int objc, Tcl_Obj *const objv[]); + +/* + * The following tables are used by the binary encoders + */ + +static const char HexDigits[16] = { + '0', '1', '2', '3', '4', '5', '6', '7', + '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' +}; + +static const char UueDigits[65] = { + '`', '!', '"', '#', '$', '%', '&', '\'', + '(', ')', '*', '+', ',', '-', '.', '/', + '0', '1', '2', '3', '4', '5', '6', '7', + '8', '9', ':', ';', '<', '=', '>', '?', + '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', + 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', + 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', + 'X', 'Y', 'Z', '[', '\\',']', '^', '_', + '`' +}; + +static const char B64Digits[65] = { + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', + 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', + 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', + 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', + 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', + 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', + 'w', 'x', 'y', 'z', '0', '1', '2', '3', + '4', '5', '6', '7', '8', '9', '+', '/', + '=' +}; + +/* + * How to construct the ensembles. + */ + +static const EnsembleImplMap binaryMap[] = { + { "format", BinaryFormatCmd, TclCompileBasicMin1ArgCmd, NULL, NULL, 0 }, + { "scan", BinaryScanCmd, TclCompileBasicMin2ArgCmd, NULL, NULL, 0 }, + { "encode", NULL, NULL, NULL, NULL, 0 }, + { "decode", NULL, NULL, NULL, NULL, 0 }, + { NULL, NULL, NULL, NULL, NULL, 0 } +}; +static const EnsembleImplMap encodeMap[] = { + { "hex", BinaryEncodeHex, TclCompileBasic1ArgCmd, NULL, NULL, 0 }, + { "uuencode", BinaryEncodeUu, NULL, NULL, NULL, 0 }, + { "base64", BinaryEncode64, NULL, NULL, NULL, 0 }, + { NULL, NULL, NULL, NULL, NULL, 0 } +}; +static const EnsembleImplMap decodeMap[] = { + { "hex", BinaryDecodeHex, TclCompileBasic1Or2ArgCmd, NULL, NULL, 0 }, + { "uuencode", BinaryDecodeUu, TclCompileBasic1Or2ArgCmd, NULL, NULL, 0 }, + { "base64", BinaryDecode64, TclCompileBasic1Or2ArgCmd, NULL, NULL, 0 }, + { NULL, NULL, NULL, NULL, NULL, 0 } +}; /* * The following object type represents an array of bytes. An array of bytes @@ -96,7 +179,7 @@ static void CopyNumber(const void *from, void *to, * converting an arbitrary String to a ByteArray may be. */ -Tcl_ObjType tclByteArrayType = { +const Tcl_ObjType tclByteArrayType = { "bytearray", FreeByteArrayInternalRep, DupByteArrayInternalRep, @@ -116,17 +199,17 @@ typedef struct ByteArray { * array. */ int allocated; /* The amount of space actually allocated * minus 1 byte. */ - unsigned char bytes[4]; /* The array of bytes. The actual size of this + unsigned char bytes[1]; /* The array of bytes. The actual size of this * field depends on the 'allocated' field * above. */ } ByteArray; #define BYTEARRAY_SIZE(len) \ - ((unsigned) (sizeof(ByteArray) - 4 + (len))) + ((unsigned) (TclOffset(ByteArray, bytes) + (len))) #define GET_BYTEARRAY(objPtr) \ ((ByteArray *) (objPtr)->internalRep.twoPtrValue.ptr1) #define SET_BYTEARRAY(objPtr, baPtr) \ - (objPtr)->internalRep.twoPtrValue.ptr1 = (VOID *) (baPtr) + (objPtr)->internalRep.twoPtrValue.ptr1 = (void *) (baPtr) /* @@ -147,7 +230,6 @@ typedef struct ByteArray { *---------------------------------------------------------------------- */ -#ifdef TCL_MEM_DEBUG #undef Tcl_NewByteArrayObj Tcl_Obj * @@ -157,25 +239,16 @@ Tcl_NewByteArrayObj( int length) /* Length of the array of bytes, which must be * >= 0. */ { +#ifdef TCL_MEM_DEBUG return Tcl_DbNewByteArrayObj(bytes, length, "unknown", 0); -} - #else /* if not TCL_MEM_DEBUG */ - -Tcl_Obj * -Tcl_NewByteArrayObj( - const unsigned char *bytes, /* The array of bytes used to initialize the - * new object. */ - int length) /* Length of the array of bytes, which must be - * >= 0. */ -{ Tcl_Obj *objPtr; TclNewObj(objPtr); Tcl_SetByteArrayObj(objPtr, bytes, length); return objPtr; -} #endif /* TCL_MEM_DEBUG */ +} /* *---------------------------------------------------------------------- @@ -202,8 +275,6 @@ Tcl_NewByteArrayObj( *---------------------------------------------------------------------- */ -#ifdef TCL_MEM_DEBUG - Tcl_Obj * Tcl_DbNewByteArrayObj( const unsigned char *bytes, /* The array of bytes used to initialize the @@ -215,30 +286,17 @@ Tcl_DbNewByteArrayObj( int line) /* Line number in the source file; used for * debugging. */ { +#ifdef TCL_MEM_DEBUG Tcl_Obj *objPtr; TclDbNewObj(objPtr, file, line); Tcl_SetByteArrayObj(objPtr, bytes, length); return objPtr; -} - #else /* if not TCL_MEM_DEBUG */ - -Tcl_Obj * -Tcl_DbNewByteArrayObj( - const unsigned char *bytes, /* The array of bytes used to initialize the - * new object. */ - int length, /* Length of the array of bytes, which must be - * >= 0. */ - const char *file, /* The name of the source file calling this - * procedure; used for debugging. */ - int line) /* Line number in the source file; used for - * debugging. */ -{ return Tcl_NewByteArrayObj(bytes, length); -} #endif /* TCL_MEM_DEBUG */ - +} + /* *--------------------------------------------------------------------------- * @@ -261,9 +319,9 @@ void Tcl_SetByteArrayObj( Tcl_Obj *objPtr, /* Object to initialize as a ByteArray. */ const unsigned char *bytes, /* The array of bytes to use as the new - * value. */ - int length) /* Length of the array of bytes, which must be - * >= 0. */ + value. May be NULL even if length > 0. */ + int length) /* Length of the array of bytes, which must + be >= 0. */ { ByteArray *byteArrayPtr; @@ -276,7 +334,7 @@ Tcl_SetByteArrayObj( if (length < 0) { length = 0; } - byteArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length)); + byteArrayPtr = ckalloc(BYTEARRAY_SIZE(length)); byteArrayPtr->used = length; byteArrayPtr->allocated = length; @@ -362,8 +420,7 @@ Tcl_SetByteArrayLength( byteArrayPtr = GET_BYTEARRAY(objPtr); if (length > byteArrayPtr->allocated) { - byteArrayPtr = (ByteArray *) ckrealloc( - (char *) byteArrayPtr, BYTEARRAY_SIZE(length)); + byteArrayPtr = ckrealloc(byteArrayPtr, BYTEARRAY_SIZE(length)); byteArrayPtr->allocated = length; SET_BYTEARRAY(objPtr, byteArrayPtr); } @@ -394,7 +451,7 @@ SetByteArrayFromAny( Tcl_Obj *objPtr) /* The object to convert to type ByteArray. */ { int length; - char *src, *srcEnd; + const char *src, *srcEnd; unsigned char *dst; ByteArray *byteArrayPtr; Tcl_UniChar ch; @@ -403,10 +460,10 @@ SetByteArrayFromAny( src = TclGetStringFromObj(objPtr, &length); srcEnd = src + length; - byteArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length)); + byteArrayPtr = ckalloc(BYTEARRAY_SIZE(length)); for (dst = byteArrayPtr->bytes; src < srcEnd; ) { src += Tcl_UtfToUniChar(src, &ch); - *dst++ = (unsigned char) ch; + *dst++ = UCHAR(ch); } byteArrayPtr->used = dst - byteArrayPtr->bytes; @@ -440,7 +497,7 @@ static void FreeByteArrayInternalRep( Tcl_Obj *objPtr) /* Object with internal rep to free. */ { - ckfree((char *) GET_BYTEARRAY(objPtr)); + ckfree(GET_BYTEARRAY(objPtr)); objPtr->typePtr = NULL; } @@ -472,7 +529,7 @@ DupByteArrayInternalRep( srcArrayPtr = GET_BYTEARRAY(srcPtr); length = srcArrayPtr->used; - copyArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length)); + copyArrayPtr = ckalloc(BYTEARRAY_SIZE(length)); copyArrayPtr->used = length; copyArrayPtr->allocated = length; memcpy(copyArrayPtr->bytes, srcArrayPtr->bytes, (size_t) length); @@ -531,7 +588,7 @@ UpdateStringOfByteArray( Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX); } - dst = (char *) ckalloc((unsigned) (size + 1)); + dst = ckalloc(size + 1); objPtr->bytes = dst; objPtr->length = size; @@ -565,7 +622,6 @@ UpdateStringOfByteArray( *---------------------------------------------------------------------- */ -#define TCL_MIN_GROWTH 1024 void TclAppendBytesToByteArray( Tcl_Obj *objPtr, @@ -607,8 +663,7 @@ TclAppendBytesToByteArray( if (needed <= INT_MAX/2) { /* Try to allocate double the total space that is needed. */ attempt = 2 * needed; - ptr = (ByteArray *) attemptckrealloc((void *) byteArrayPtr, - BYTEARRAY_SIZE(attempt)); + ptr = attemptckrealloc(byteArrayPtr, BYTEARRAY_SIZE(attempt)); } if (ptr == NULL) { /* Try to allocate double the increment that is needed (plus). */ @@ -617,14 +672,12 @@ TclAppendBytesToByteArray( int growth = (int) ((extra > limit) ? limit : extra); attempt = needed + growth; - ptr = (ByteArray *) attemptckrealloc((void *) byteArrayPtr, - BYTEARRAY_SIZE(attempt)); + ptr = attemptckrealloc(byteArrayPtr, BYTEARRAY_SIZE(attempt)); } if (ptr == NULL) { /* Last chance: Try to allocate exactly what is needed. */ attempt = needed; - ptr = (ByteArray *) ckrealloc((void *)byteArrayPtr, - BYTEARRAY_SIZE(attempt)); + ptr = ckrealloc(byteArrayPtr, BYTEARRAY_SIZE(attempt)); } byteArrayPtr = ptr; byteArrayPtr->allocated = attempt; @@ -641,9 +694,38 @@ TclAppendBytesToByteArray( /* *---------------------------------------------------------------------- * - * Tcl_BinaryObjCmd -- + * TclInitBinaryCmd -- + * + * This function is called to create the "binary" Tcl command. See the + * user documentation for details on what it does. + * + * Results: + * A command token for the new command. + * + * Side effects: + * Creates a new binary command as a mapped ensemble. + * + *---------------------------------------------------------------------- + */ + +Tcl_Command +TclInitBinaryCmd( + Tcl_Interp *interp) +{ + Tcl_Command binaryEnsemble; + + binaryEnsemble = TclMakeEnsemble(interp, "binary", binaryMap); + TclMakeEnsemble(interp, "binary encode", encodeMap); + TclMakeEnsemble(interp, "binary decode", decodeMap); + return binaryEnsemble; +} + +/* + *---------------------------------------------------------------------- + * + * BinaryFormatCmd -- * - * This procedure implements the "binary" Tcl command. + * This procedure implements the "binary format" Tcl command. * * Results: * A standard Tcl result. @@ -654,8 +736,8 @@ TclAppendBytesToByteArray( *---------------------------------------------------------------------- */ -int -Tcl_BinaryObjCmd( +static int +BinaryFormatCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ @@ -668,7 +750,7 @@ Tcl_BinaryObjCmd( int count; /* Count associated with current format * character. */ int flags; /* Format field flags */ - char *format; /* Pointer to current position in format + const char *format; /* Pointer to current position in format * string. */ Tcl_Obj *resultPtr = NULL; /* Object holding result buffer. */ unsigned char *buffer; /* Start of result buffer. */ @@ -676,797 +758,840 @@ Tcl_BinaryObjCmd( unsigned char *maxPos; /* Greatest position within result buffer that * cursor has visited.*/ const char *errorString; - char *errorValue, *str; - int offset, size, length, index; - static const char *options[] = { - "format", "scan", NULL - }; - enum options { - BINARY_FORMAT, BINARY_SCAN - }; + const char *errorValue, *str; + int offset, size, length; if (objc < 2) { - Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?"); + Tcl_WrongNumArgs(interp, 1, objv, "formatString ?arg ...?"); return TCL_ERROR; } - if (Tcl_GetIndexFromObj(interp, objv[1], options, "option", 0, - &index) != TCL_OK) { - return TCL_ERROR; - } + /* + * To avoid copying the data, we format the string in two passes. The + * first pass computes the size of the output buffer. The second pass + * places the formatted data into the buffer. + */ - switch ((enum options) index) { - case BINARY_FORMAT: - if (objc < 3) { - Tcl_WrongNumArgs(interp, 2, objv, "formatString ?arg arg ...?"); - return TCL_ERROR; + format = TclGetString(objv[1]); + arg = 2; + offset = 0; + length = 0; + while (*format != '\0') { + str = format; + flags = 0; + if (!GetFormatSpec(&format, &cmd, &count, &flags)) { + break; } + switch (cmd) { + case 'a': + case 'A': + case 'b': + case 'B': + case 'h': + case 'H': + /* + * For string-type specifiers, the count corresponds to the number + * of bytes in a single argument. + */ - /* - * To avoid copying the data, we format the string in two passes. The - * first pass computes the size of the output buffer. The second pass - * places the formatted data into the buffer. - */ - - format = TclGetString(objv[2]); - arg = 3; - offset = 0; - length = 0; - while (*format != '\0') { - str = format; - flags = 0; - if (!GetFormatSpec(&format, &cmd, &count, &flags)) { - break; + if (arg >= objc) { + goto badIndex; + } + if (count == BINARY_ALL) { + Tcl_GetByteArrayFromObj(objv[arg], &count); + } else if (count == BINARY_NOCOUNT) { + count = 1; + } + arg++; + if (cmd == 'a' || cmd == 'A') { + offset += count; + } else if (cmd == 'b' || cmd == 'B') { + offset += (count + 7) / 8; + } else { + offset += (count + 1) / 2; + } + break; + case 'c': + size = 1; + goto doNumbers; + case 't': + case 's': + case 'S': + size = 2; + goto doNumbers; + case 'n': + case 'i': + case 'I': + size = 4; + goto doNumbers; + case 'm': + case 'w': + case 'W': + size = 8; + goto doNumbers; + case 'r': + case 'R': + case 'f': + size = sizeof(float); + goto doNumbers; + case 'q': + case 'Q': + case 'd': + size = sizeof(double); + + doNumbers: + if (arg >= objc) { + goto badIndex; } - switch (cmd) { - case 'a': - case 'A': - case 'b': - case 'B': - case 'h': - case 'H': - /* - * For string-type specifiers, the count corresponds to the - * number of bytes in a single argument. - */ - if (arg >= objc) { - goto badIndex; - } - if (count == BINARY_ALL) { - Tcl_GetByteArrayFromObj(objv[arg], &count); - } else if (count == BINARY_NOCOUNT) { - count = 1; - } + /* + * For number-type specifiers, the count corresponds to the number + * of elements in the list stored in a single argument. If no + * count is specified, then the argument is taken as a single + * non-list value. + */ + + if (count == BINARY_NOCOUNT) { arg++; - if (cmd == 'a' || cmd == 'A') { - offset += count; - } else if (cmd == 'b' || cmd == 'B') { - offset += (count + 7) / 8; - } else { - offset += (count + 1) / 2; - } - break; - case 'c': - size = 1; - goto doNumbers; - case 't': - case 's': - case 'S': - size = 2; - goto doNumbers; - case 'n': - case 'i': - case 'I': - size = 4; - goto doNumbers; - case 'm': - case 'w': - case 'W': - size = 8; - goto doNumbers; - case 'r': - case 'R': - case 'f': - size = sizeof(float); - goto doNumbers; - case 'q': - case 'Q': - case 'd': - size = sizeof(double); - - doNumbers: - if (arg >= objc) { - goto badIndex; - } + count = 1; + } else { + int listc; + Tcl_Obj **listv; /* - * For number-type specifiers, the count corresponds to the - * number of elements in the list stored in a single argument. - * If no count is specified, then the argument is taken as a - * single non-list value. + * The macro evals its args more than once: avoid arg++ */ - if (count == BINARY_NOCOUNT) { - arg++; - count = 1; - } else { - int listc; - Tcl_Obj **listv; - - /* The macro evals its args more than once: avoid arg++ */ - if (TclListObjGetElements(interp, objv[arg], &listc, - &listv) != TCL_OK) { - return TCL_ERROR; - } - arg++; - - if (count == BINARY_ALL) { - count = listc; - } else if (count > listc) { - Tcl_AppendResult(interp, - "number of elements in list does not match count", - NULL); - return TCL_ERROR; - } + if (TclListObjGetElements(interp, objv[arg], &listc, + &listv) != TCL_OK) { + return TCL_ERROR; } - offset += count*size; - break; + arg++; - case 'x': if (count == BINARY_ALL) { - Tcl_AppendResult(interp, - "cannot use \"*\" in format string with \"x\"", - NULL); + count = listc; + } else if (count > listc) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "number of elements in list does not match count", + -1)); return TCL_ERROR; - } else if (count == BINARY_NOCOUNT) { - count = 1; - } - offset += count; - break; - case 'X': - if (count == BINARY_NOCOUNT) { - count = 1; } - if ((count > offset) || (count == BINARY_ALL)) { - count = offset; - } - if (offset > length) { - length = offset; - } - offset -= count; - break; - case '@': - if (offset > length) { - length = offset; - } - if (count == BINARY_ALL) { - offset = length; - } else if (count == BINARY_NOCOUNT) { - goto badCount; - } else { - offset = count; - } - break; - default: - errorString = str; - goto badField; } + offset += count*size; + break; + + case 'x': + if (count == BINARY_ALL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "cannot use \"*\" in format string with \"x\"", -1)); + return TCL_ERROR; + } else if (count == BINARY_NOCOUNT) { + count = 1; + } + offset += count; + break; + case 'X': + if (count == BINARY_NOCOUNT) { + count = 1; + } + if ((count > offset) || (count == BINARY_ALL)) { + count = offset; + } + if (offset > length) { + length = offset; + } + offset -= count; + break; + case '@': + if (offset > length) { + length = offset; + } + if (count == BINARY_ALL) { + offset = length; + } else if (count == BINARY_NOCOUNT) { + goto badCount; + } else { + offset = count; + } + break; + default: + errorString = str; + goto badField; } - if (offset > length) { - length = offset; - } - if (length == 0) { - return TCL_OK; - } + } + if (offset > length) { + length = offset; + } + if (length == 0) { + return TCL_OK; + } - /* - * Prepare the result object by preallocating the caclulated number of - * bytes and filling with nulls. - */ + /* + * Prepare the result object by preallocating the caclulated number of + * bytes and filling with nulls. + */ - resultPtr = Tcl_NewObj(); - buffer = Tcl_SetByteArrayLength(resultPtr, length); - memset(buffer, 0, (size_t) length); + resultPtr = Tcl_NewObj(); + buffer = Tcl_SetByteArrayLength(resultPtr, length); + memset(buffer, 0, (size_t) length); - /* - * Pack the data into the result object. Note that we can skip the - * error checking during this pass, since we have already parsed the - * string once. - */ + /* + * Pack the data into the result object. Note that we can skip the + * error checking during this pass, since we have already parsed the + * string once. + */ - arg = 3; - format = TclGetString(objv[2]); - cursor = buffer; - maxPos = cursor; - while (*format != 0) { - flags = 0; - if (!GetFormatSpec(&format, &cmd, &count, &flags)) { - break; + arg = 2; + format = TclGetString(objv[1]); + cursor = buffer; + maxPos = cursor; + while (*format != 0) { + flags = 0; + if (!GetFormatSpec(&format, &cmd, &count, &flags)) { + break; + } + if ((count == 0) && (cmd != '@')) { + if (cmd != 'x') { + arg++; } - if ((count == 0) && (cmd != '@')) { - if (cmd != 'x') { - arg++; - } - continue; + continue; + } + switch (cmd) { + case 'a': + case 'A': { + char pad = (char) (cmd == 'a' ? '\0' : ' '); + unsigned char *bytes; + + bytes = Tcl_GetByteArrayFromObj(objv[arg++], &length); + + if (count == BINARY_ALL) { + count = length; + } else if (count == BINARY_NOCOUNT) { + count = 1; } - switch (cmd) { - case 'a': - case 'A': { - char pad = (char) (cmd == 'a' ? '\0' : ' '); - unsigned char *bytes; - - bytes = Tcl_GetByteArrayFromObj(objv[arg++], &length); - - if (count == BINARY_ALL) { - count = length; - } else if (count == BINARY_NOCOUNT) { - count = 1; - } - if (length >= count) { - memcpy(cursor, bytes, (size_t) count); - } else { - memcpy(cursor, bytes, (size_t) length); - memset(cursor + length, pad, (size_t) (count - length)); - } - cursor += count; - break; + if (length >= count) { + memcpy(cursor, bytes, (size_t) count); + } else { + memcpy(cursor, bytes, (size_t) length); + memset(cursor + length, pad, (size_t) (count - length)); } - case 'b': - case 'B': { - unsigned char *last; - - str = TclGetStringFromObj(objv[arg], &length); - arg++; - if (count == BINARY_ALL) { - count = length; - } else if (count == BINARY_NOCOUNT) { - count = 1; - } - last = cursor + ((count + 7) / 8); - if (count > length) { - count = length; - } - value = 0; - errorString = "binary"; - if (cmd == 'B') { - for (offset = 0; offset < count; offset++) { - value <<= 1; - if (str[offset] == '1') { - value |= 1; - } else if (str[offset] != '0') { - errorValue = str; - Tcl_DecrRefCount(resultPtr); - goto badValue; - } - if (((offset + 1) % 8) == 0) { - *cursor++ = (unsigned char) value; - value = 0; - } + cursor += count; + break; + } + case 'b': + case 'B': { + unsigned char *last; + + str = TclGetStringFromObj(objv[arg], &length); + arg++; + if (count == BINARY_ALL) { + count = length; + } else if (count == BINARY_NOCOUNT) { + count = 1; + } + last = cursor + ((count + 7) / 8); + if (count > length) { + count = length; + } + value = 0; + errorString = "binary"; + if (cmd == 'B') { + for (offset = 0; offset < count; offset++) { + value <<= 1; + if (str[offset] == '1') { + value |= 1; + } else if (str[offset] != '0') { + errorValue = str; + Tcl_DecrRefCount(resultPtr); + goto badValue; } - } else { - for (offset = 0; offset < count; offset++) { - value >>= 1; - if (str[offset] == '1') { - value |= 128; - } else if (str[offset] != '0') { - errorValue = str; - Tcl_DecrRefCount(resultPtr); - goto badValue; - } - if (!((offset + 1) % 8)) { - *cursor++ = (unsigned char) value; - value = 0; - } + if (((offset + 1) % 8) == 0) { + *cursor++ = UCHAR(value); + value = 0; } } - if ((offset % 8) != 0) { - if (cmd == 'B') { - value <<= 8 - (offset % 8); - } else { - value >>= 8 - (offset % 8); + } else { + for (offset = 0; offset < count; offset++) { + value >>= 1; + if (str[offset] == '1') { + value |= 128; + } else if (str[offset] != '0') { + errorValue = str; + Tcl_DecrRefCount(resultPtr); + goto badValue; + } + if (!((offset + 1) % 8)) { + *cursor++ = UCHAR(value); + value = 0; } - *cursor++ = (unsigned char) value; - } - while (cursor < last) { - *cursor++ = '\0'; } - break; } - case 'h': - case 'H': { - unsigned char *last; - int c; - - str = TclGetStringFromObj(objv[arg], &length); - arg++; - if (count == BINARY_ALL) { - count = length; - } else if (count == BINARY_NOCOUNT) { - count = 1; - } - last = cursor + ((count + 1) / 2); - if (count > length) { - count = length; + if ((offset % 8) != 0) { + if (cmd == 'B') { + value <<= 8 - (offset % 8); + } else { + value >>= 8 - (offset % 8); } - value = 0; - errorString = "hexadecimal"; - if (cmd == 'H') { - for (offset = 0; offset < count; offset++) { - value <<= 4; - if (!isxdigit(UCHAR(str[offset]))) { /* INTL: digit */ - errorValue = str; - Tcl_DecrRefCount(resultPtr); - goto badValue; - } - c = str[offset] - '0'; - if (c > 9) { - c += ('0' - 'A') + 10; - } - if (c > 16) { - c += ('A' - 'a'); - } - value |= (c & 0xf); - if (offset % 2) { - *cursor++ = (char) value; - value = 0; - } + *cursor++ = UCHAR(value); + } + while (cursor < last) { + *cursor++ = '\0'; + } + break; + } + case 'h': + case 'H': { + unsigned char *last; + int c; + + str = TclGetStringFromObj(objv[arg], &length); + arg++; + if (count == BINARY_ALL) { + count = length; + } else if (count == BINARY_NOCOUNT) { + count = 1; + } + last = cursor + ((count + 1) / 2); + if (count > length) { + count = length; + } + value = 0; + errorString = "hexadecimal"; + if (cmd == 'H') { + for (offset = 0; offset < count; offset++) { + value <<= 4; + if (!isxdigit(UCHAR(str[offset]))) { /* INTL: digit */ + errorValue = str; + Tcl_DecrRefCount(resultPtr); + goto badValue; } - } else { - for (offset = 0; offset < count; offset++) { - value >>= 4; - - if (!isxdigit(UCHAR(str[offset]))) { /* INTL: digit */ - errorValue = str; - Tcl_DecrRefCount(resultPtr); - goto badValue; - } - c = str[offset] - '0'; - if (c > 9) { - c += ('0' - 'A') + 10; - } - if (c > 16) { - c += ('A' - 'a'); - } - value |= ((c << 4) & 0xf0); - if (offset % 2) { - *cursor++ = (unsigned char)(value & 0xff); - value = 0; - } + c = str[offset] - '0'; + if (c > 9) { + c += ('0' - 'A') + 10; } - } - if (offset % 2) { - if (cmd == 'H') { - value <<= 4; - } else { - value >>= 4; + if (c > 16) { + c += ('A' - 'a'); } - *cursor++ = (unsigned char) value; - } - - while (cursor < last) { - *cursor++ = '\0'; - } - break; - } - case 'c': - case 't': - case 's': - case 'S': - case 'n': - case 'i': - case 'I': - case 'm': - case 'w': - case 'W': - case 'r': - case 'R': - case 'd': - case 'q': - case 'Q': - case 'f': { - int listc, i; - Tcl_Obj **listv; - - if (count == BINARY_NOCOUNT) { - /* - * Note that we are casting away the const-ness of objv, - * but this is safe since we aren't going to modify the - * array. - */ - - listv = (Tcl_Obj**)(objv + arg); - listc = 1; - count = 1; - } else { - TclListObjGetElements(interp, objv[arg], &listc, &listv); - if (count == BINARY_ALL) { - count = listc; + value |= (c & 0xf); + if (offset % 2) { + *cursor++ = (char) value; + value = 0; } } - arg++; - for (i = 0; i < count; i++) { - if (FormatNumber(interp, cmd, listv[i], &cursor)!=TCL_OK) { + } else { + for (offset = 0; offset < count; offset++) { + value >>= 4; + + if (!isxdigit(UCHAR(str[offset]))) { /* INTL: digit */ + errorValue = str; Tcl_DecrRefCount(resultPtr); - return TCL_ERROR; + goto badValue; + } + c = str[offset] - '0'; + if (c > 9) { + c += ('0' - 'A') + 10; + } + if (c > 16) { + c += ('A' - 'a'); + } + value |= ((c << 4) & 0xf0); + if (offset % 2) { + *cursor++ = UCHAR(value & 0xff); + value = 0; } } - break; } - case 'x': - if (count == BINARY_NOCOUNT) { - count = 1; - } - memset(cursor, 0, (size_t) count); - cursor += count; - break; - case 'X': - if (cursor > maxPos) { - maxPos = cursor; - } - if (count == BINARY_NOCOUNT) { - count = 1; - } - if ((count == BINARY_ALL) || (count > (cursor - buffer))) { - cursor = buffer; + if (offset % 2) { + if (cmd == 'H') { + value <<= 4; } else { - cursor -= count; - } - break; - case '@': - if (cursor > maxPos) { - maxPos = cursor; + value >>= 4; } + *cursor++ = UCHAR(value); + } + + while (cursor < last) { + *cursor++ = '\0'; + } + break; + } + case 'c': + case 't': + case 's': + case 'S': + case 'n': + case 'i': + case 'I': + case 'm': + case 'w': + case 'W': + case 'r': + case 'R': + case 'd': + case 'q': + case 'Q': + case 'f': { + int listc, i; + Tcl_Obj **listv; + + if (count == BINARY_NOCOUNT) { + /* + * Note that we are casting away the const-ness of objv, but + * this is safe since we aren't going to modify the array. + */ + + listv = (Tcl_Obj **) (objv + arg); + listc = 1; + count = 1; + } else { + TclListObjGetElements(interp, objv[arg], &listc, &listv); if (count == BINARY_ALL) { - cursor = maxPos; - } else { - cursor = buffer + count; + count = listc; + } + } + arg++; + for (i = 0; i < count; i++) { + if (FormatNumber(interp, cmd, listv[i], &cursor)!=TCL_OK) { + Tcl_DecrRefCount(resultPtr); + return TCL_ERROR; } - break; } + break; } - Tcl_SetObjResult(interp, resultPtr); - break; - case BINARY_SCAN: { - int i; - Tcl_Obj *valuePtr, *elementPtr; - Tcl_HashTable numberCacheHash; - Tcl_HashTable *numberCachePtr; - - if (objc < 4) { - Tcl_WrongNumArgs(interp, 2, objv, - "value formatString ?varName varName ...?"); - return TCL_ERROR; + case 'x': + if (count == BINARY_NOCOUNT) { + count = 1; + } + memset(cursor, 0, (size_t) count); + cursor += count; + break; + case 'X': + if (cursor > maxPos) { + maxPos = cursor; + } + if (count == BINARY_NOCOUNT) { + count = 1; + } + if ((count == BINARY_ALL) || (count > (cursor - buffer))) { + cursor = buffer; + } else { + cursor -= count; + } + break; + case '@': + if (cursor > maxPos) { + maxPos = cursor; + } + if (count == BINARY_ALL) { + cursor = maxPos; + } else { + cursor = buffer + count; + } + break; + } + } + Tcl_SetObjResult(interp, resultPtr); + return TCL_OK; + + badValue: + Tcl_ResetResult(interp); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "expected %s string but got \"%s\" instead", + errorString, errorValue)); + return TCL_ERROR; + + badCount: + errorString = "missing count for \"@\" field specifier"; + goto error; + + badIndex: + errorString = "not enough arguments for all format specifiers"; + goto error; + + badField: + { + Tcl_UniChar ch; + char buf[TCL_UTF_MAX + 1]; + + Tcl_UtfToUniChar(errorString, &ch); + buf[Tcl_UniCharToUtf(ch, buf)] = '\0'; + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "bad field specifier \"%s\"", buf)); + return TCL_ERROR; + } + + error: + Tcl_SetObjResult(interp, Tcl_NewStringObj(errorString, -1)); + return TCL_ERROR; +} + +/* + *---------------------------------------------------------------------- + * + * BinaryScanCmd -- + * + * This procedure implements the "binary scan" Tcl command. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * See the user documentation. + * + *---------------------------------------------------------------------- + */ + +int +BinaryScanCmd( + ClientData dummy, /* Not used. */ + Tcl_Interp *interp, /* Current interpreter. */ + int objc, /* Number of arguments. */ + Tcl_Obj *const objv[]) /* Argument objects. */ +{ + int arg; /* Index of next argument to consume. */ + int value = 0; /* Current integer value to be packed. + * Initialized to avoid compiler warning. */ + char cmd; /* Current format character. */ + int count; /* Count associated with current format + * character. */ + int flags; /* Format field flags */ + const char *format; /* Pointer to current position in format + * string. */ + Tcl_Obj *resultPtr = NULL; /* Object holding result buffer. */ + unsigned char *buffer; /* Start of result buffer. */ + const char *errorString; + const char *str; + int offset, size, length; + + int i; + Tcl_Obj *valuePtr, *elementPtr; + Tcl_HashTable numberCacheHash; + Tcl_HashTable *numberCachePtr; + + if (objc < 3) { + Tcl_WrongNumArgs(interp, 1, objv, + "value formatString ?varName ...?"); + return TCL_ERROR; + } + numberCachePtr = &numberCacheHash; + Tcl_InitHashTable(numberCachePtr, TCL_ONE_WORD_KEYS); + buffer = Tcl_GetByteArrayFromObj(objv[1], &length); + format = TclGetString(objv[2]); + arg = 3; + offset = 0; + while (*format != '\0') { + str = format; + flags = 0; + if (!GetFormatSpec(&format, &cmd, &count, &flags)) { + goto done; } - numberCachePtr = &numberCacheHash; - Tcl_InitHashTable(numberCachePtr, TCL_ONE_WORD_KEYS); - buffer = Tcl_GetByteArrayFromObj(objv[2], &length); - format = TclGetString(objv[3]); - cursor = buffer; - arg = 4; - offset = 0; - while (*format != '\0') { - str = format; - flags = 0; - if (!GetFormatSpec(&format, &cmd, &count, &flags)) { - goto done; - } - switch (cmd) { - case 'a': - case 'A': { - unsigned char *src; - - if (arg >= objc) { - DeleteScanNumberCache(numberCachePtr); - goto badIndex; + switch (cmd) { + case 'a': + case 'A': { + unsigned char *src; + + if (arg >= objc) { + DeleteScanNumberCache(numberCachePtr); + goto badIndex; + } + if (count == BINARY_ALL) { + count = length - offset; + } else { + if (count == BINARY_NOCOUNT) { + count = 1; } - if (count == BINARY_ALL) { - count = length - offset; - } else { - if (count == BINARY_NOCOUNT) { - count = 1; - } - if (count > (length - offset)) { - goto done; - } + if (count > (length - offset)) { + goto done; } + } - src = buffer + offset; - size = count; + src = buffer + offset; + size = count; - /* - * Trim trailing nulls and spaces, if necessary. - */ + /* + * Trim trailing nulls and spaces, if necessary. + */ - if (cmd == 'A') { - while (size > 0) { - if (src[size-1] != '\0' && src[size-1] != ' ') { - break; - } - size--; + if (cmd == 'A') { + while (size > 0) { + if (src[size-1] != '\0' && src[size-1] != ' ') { + break; } + size--; } + } - /* - * Have to do this #ifdef-fery because (as part of defining - * Tcl_NewByteArrayObj) we removed the #def that hides this - * stuff normally. If this code ever gets copied to another - * file, it should be changed back to the simpler version. - */ + /* + * Have to do this #ifdef-fery because (as part of defining + * Tcl_NewByteArrayObj) we removed the #def that hides this stuff + * normally. If this code ever gets copied to another file, it + * should be changed back to the simpler version. + */ #ifdef TCL_MEM_DEBUG - valuePtr = Tcl_DbNewByteArrayObj(src, size, __FILE__,__LINE__); + valuePtr = Tcl_DbNewByteArrayObj(src, size, __FILE__, __LINE__); #else - valuePtr = Tcl_NewByteArrayObj(src, size); + valuePtr = Tcl_NewByteArrayObj(src, size); #endif /* TCL_MEM_DEBUG */ - resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr, - TCL_LEAVE_ERR_MSG); - arg++; - if (resultPtr == NULL) { - DeleteScanNumberCache(numberCachePtr); - return TCL_ERROR; - } - offset += count; - break; + resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr, + TCL_LEAVE_ERR_MSG); + arg++; + if (resultPtr == NULL) { + DeleteScanNumberCache(numberCachePtr); + return TCL_ERROR; } - case 'b': - case 'B': { - unsigned char *src; - char *dest; + offset += count; + break; + } + case 'b': + case 'B': { + unsigned char *src; + char *dest; - if (arg >= objc) { - DeleteScanNumberCache(numberCachePtr); - goto badIndex; - } - if (count == BINARY_ALL) { - count = (length - offset) * 8; - } else { - if (count == BINARY_NOCOUNT) { - count = 1; - } - if (count > (length - offset) * 8) { - goto done; - } - } - src = buffer + offset; - valuePtr = Tcl_NewObj(); - Tcl_SetObjLength(valuePtr, count); - dest = TclGetString(valuePtr); - - if (cmd == 'b') { - for (i = 0; i < count; i++) { - if (i % 8) { - value >>= 1; - } else { - value = *src++; - } - *dest++ = (char) ((value & 1) ? '1' : '0'); - } - } else { - for (i = 0; i < count; i++) { - if (i % 8) { - value <<= 1; - } else { - value = *src++; - } - *dest++ = (char) ((value & 0x80) ? '1' : '0'); - } + if (arg >= objc) { + DeleteScanNumberCache(numberCachePtr); + goto badIndex; + } + if (count == BINARY_ALL) { + count = (length - offset) * 8; + } else { + if (count == BINARY_NOCOUNT) { + count = 1; } - - resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr, - TCL_LEAVE_ERR_MSG); - arg++; - if (resultPtr == NULL) { - DeleteScanNumberCache(numberCachePtr); - return TCL_ERROR; + if (count > (length - offset) * 8) { + goto done; } - offset += (count + 7) / 8; - break; } - case 'h': - case 'H': { - char *dest; - unsigned char *src; - int i; - static const char hexdigit[] = "0123456789abcdef"; + src = buffer + offset; + valuePtr = Tcl_NewObj(); + Tcl_SetObjLength(valuePtr, count); + dest = TclGetString(valuePtr); - if (arg >= objc) { - DeleteScanNumberCache(numberCachePtr); - goto badIndex; - } - if (count == BINARY_ALL) { - count = (length - offset)*2; - } else { - if (count == BINARY_NOCOUNT) { - count = 1; - } - if (count > (length - offset)*2) { - goto done; + if (cmd == 'b') { + for (i = 0; i < count; i++) { + if (i % 8) { + value >>= 1; + } else { + value = *src++; } + *dest++ = (char) ((value & 1) ? '1' : '0'); } - src = buffer + offset; - valuePtr = Tcl_NewObj(); - Tcl_SetObjLength(valuePtr, count); - dest = TclGetString(valuePtr); - - if (cmd == 'h') { - for (i = 0; i < count; i++) { - if (i % 2) { - value >>= 4; - } else { - value = *src++; - } - *dest++ = hexdigit[value & 0xf]; - } - } else { - for (i = 0; i < count; i++) { - if (i % 2) { - value <<= 4; - } else { - value = *src++; - } - *dest++ = hexdigit[(value >> 4) & 0xf]; + } else { + for (i = 0; i < count; i++) { + if (i % 8) { + value <<= 1; + } else { + value = *src++; } + *dest++ = (char) ((value & 0x80) ? '1' : '0'); } + } - resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr, - TCL_LEAVE_ERR_MSG); - arg++; - if (resultPtr == NULL) { - DeleteScanNumberCache(numberCachePtr); - return TCL_ERROR; - } - offset += (count + 1) / 2; - break; + resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr, + TCL_LEAVE_ERR_MSG); + arg++; + if (resultPtr == NULL) { + DeleteScanNumberCache(numberCachePtr); + return TCL_ERROR; } - case 'c': - size = 1; - goto scanNumber; - case 't': - case 's': - case 'S': - size = 2; - goto scanNumber; - case 'n': - case 'i': - case 'I': - size = 4; - goto scanNumber; - case 'm': - case 'w': - case 'W': - size = 8; - goto scanNumber; - case 'r': - case 'R': - case 'f': - size = sizeof(float); - goto scanNumber; - case 'q': - case 'Q': - case 'd': { - unsigned char *src; - - size = sizeof(double); - /* fall through */ - - scanNumber: - if (arg >= objc) { - DeleteScanNumberCache(numberCachePtr); - goto badIndex; - } - if (count == BINARY_NOCOUNT) { - if ((length - offset) < size) { - goto done; - } - valuePtr = ScanNumber(buffer+offset, cmd, flags, - &numberCachePtr); - offset += size; - } else { - if (count == BINARY_ALL) { - count = (length - offset) / size; - } - if ((length - offset) < (count * size)) { - goto done; - } - valuePtr = Tcl_NewObj(); - src = buffer+offset; - for (i = 0; i < count; i++) { - elementPtr = ScanNumber(src, cmd, flags, - &numberCachePtr); - src += size; - Tcl_ListObjAppendElement(NULL, valuePtr, elementPtr); - } - offset += count*size; - } + offset += (count + 7) / 8; + break; + } + case 'h': + case 'H': { + char *dest; + unsigned char *src; + static const char hexdigit[] = "0123456789abcdef"; - resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr, - TCL_LEAVE_ERR_MSG); - arg++; - if (resultPtr == NULL) { - DeleteScanNumberCache(numberCachePtr); - return TCL_ERROR; - } - break; + if (arg >= objc) { + DeleteScanNumberCache(numberCachePtr); + goto badIndex; } - case 'x': + if (count == BINARY_ALL) { + count = (length - offset)*2; + } else { if (count == BINARY_NOCOUNT) { count = 1; } - if ((count == BINARY_ALL) || (count > (length - offset))) { - offset = length; - } else { - offset += count; + if (count > (length - offset)*2) { + goto done; } - break; - case 'X': - if (count == BINARY_NOCOUNT) { - count = 1; + } + src = buffer + offset; + valuePtr = Tcl_NewObj(); + Tcl_SetObjLength(valuePtr, count); + dest = TclGetString(valuePtr); + + if (cmd == 'h') { + for (i = 0; i < count; i++) { + if (i % 2) { + value >>= 4; + } else { + value = *src++; + } + *dest++ = hexdigit[value & 0xf]; } - if ((count == BINARY_ALL) || (count > offset)) { - offset = 0; - } else { - offset -= count; + } else { + for (i = 0; i < count; i++) { + if (i % 2) { + value <<= 4; + } else { + value = *src++; + } + *dest++ = hexdigit[(value >> 4) & 0xf]; } - break; - case '@': - if (count == BINARY_NOCOUNT) { - DeleteScanNumberCache(numberCachePtr); - goto badCount; + } + + resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr, + TCL_LEAVE_ERR_MSG); + arg++; + if (resultPtr == NULL) { + DeleteScanNumberCache(numberCachePtr); + return TCL_ERROR; + } + offset += (count + 1) / 2; + break; + } + case 'c': + size = 1; + goto scanNumber; + case 't': + case 's': + case 'S': + size = 2; + goto scanNumber; + case 'n': + case 'i': + case 'I': + size = 4; + goto scanNumber; + case 'm': + case 'w': + case 'W': + size = 8; + goto scanNumber; + case 'r': + case 'R': + case 'f': + size = sizeof(float); + goto scanNumber; + case 'q': + case 'Q': + case 'd': { + unsigned char *src; + + size = sizeof(double); + /* fall through */ + + scanNumber: + if (arg >= objc) { + DeleteScanNumberCache(numberCachePtr); + goto badIndex; + } + if (count == BINARY_NOCOUNT) { + if ((length - offset) < size) { + goto done; } - if ((count == BINARY_ALL) || (count > length)) { - offset = length; - } else { - offset = count; + valuePtr = ScanNumber(buffer+offset, cmd, flags, + &numberCachePtr); + offset += size; + } else { + if (count == BINARY_ALL) { + count = (length - offset) / size; } - break; - default: + if ((length - offset) < (count * size)) { + goto done; + } + valuePtr = Tcl_NewObj(); + src = buffer + offset; + for (i = 0; i < count; i++) { + elementPtr = ScanNumber(src, cmd, flags, &numberCachePtr); + src += size; + Tcl_ListObjAppendElement(NULL, valuePtr, elementPtr); + } + offset += count * size; + } + + resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr, + TCL_LEAVE_ERR_MSG); + arg++; + if (resultPtr == NULL) { + DeleteScanNumberCache(numberCachePtr); + return TCL_ERROR; + } + break; + } + case 'x': + if (count == BINARY_NOCOUNT) { + count = 1; + } + if ((count == BINARY_ALL) || (count > (length - offset))) { + offset = length; + } else { + offset += count; + } + break; + case 'X': + if (count == BINARY_NOCOUNT) { + count = 1; + } + if ((count == BINARY_ALL) || (count > offset)) { + offset = 0; + } else { + offset -= count; + } + break; + case '@': + if (count == BINARY_NOCOUNT) { DeleteScanNumberCache(numberCachePtr); - errorString = str; - goto badField; + goto badCount; + } + if ((count == BINARY_ALL) || (count > length)) { + offset = length; + } else { + offset = count; } + break; + default: + DeleteScanNumberCache(numberCachePtr); + errorString = str; + goto badField; } + } - /* - * Set the result to the last position of the cursor. - */ + /* + * Set the result to the last position of the cursor. + */ - done: - Tcl_SetObjResult(interp, Tcl_NewLongObj(arg - 4)); - DeleteScanNumberCache(numberCachePtr); - break; - } - } - return TCL_OK; + done: + Tcl_SetObjResult(interp, Tcl_NewLongObj(arg - 3)); + DeleteScanNumberCache(numberCachePtr); - badValue: - Tcl_ResetResult(interp); - Tcl_AppendResult(interp, "expected ", errorString, - " string but got \"", errorValue, "\" instead", NULL); - return TCL_ERROR; + return TCL_OK; - badCount: + badCount: errorString = "missing count for \"@\" field specifier"; goto error; - badIndex: + badIndex: errorString = "not enough arguments for all format specifiers"; goto error; - badField: + badField: { Tcl_UniChar ch; char buf[TCL_UTF_MAX + 1]; Tcl_UtfToUniChar(errorString, &ch); buf[Tcl_UniCharToUtf(ch, buf)] = '\0'; - Tcl_AppendResult(interp, "bad field specifier \"", buf, "\"", NULL); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "bad field specifier \"%s\"", buf)); return TCL_ERROR; } - error: - Tcl_AppendResult(interp, errorString, NULL); + error: + Tcl_SetObjResult(interp, Tcl_NewStringObj(errorString, -1)); return TCL_ERROR; } @@ -1493,7 +1618,7 @@ Tcl_BinaryObjCmd( static int GetFormatSpec( - char **formatPtr, /* Pointer to format string. */ + const char **formatPtr, /* Pointer to format string. */ char *cmdPtr, /* Pointer to location of command char. */ int *countPtr, /* Pointer to repeat count value. */ int *flagsPtr) /* Pointer to field flags */ @@ -1522,15 +1647,15 @@ GetFormatSpec( (*formatPtr)++; if (**formatPtr == 'u') { (*formatPtr)++; - (*flagsPtr) |= BINARY_UNSIGNED; + *flagsPtr |= BINARY_UNSIGNED; } if (**formatPtr == '*') { (*formatPtr)++; - (*countPtr) = BINARY_ALL; + *countPtr = BINARY_ALL; } else if (isdigit(UCHAR(**formatPtr))) { /* INTL: digit */ - (*countPtr) = strtoul(*formatPtr, formatPtr, 10); + *countPtr = strtoul(*formatPtr, (char **) formatPtr, 10); } else { - (*countPtr) = BINARY_NOCOUNT; + *countPtr = BINARY_NOCOUNT; } return 1; } @@ -1653,11 +1778,11 @@ static void CopyNumber( const void *from, /* source */ void *to, /* destination */ - unsigned int length, /* Number of bytes to copy */ + unsigned length, /* Number of bytes to copy */ int type) /* What type of thing are we copying? */ { switch (NeedReversing(type)) { - case 0: + case 0: memcpy(to, from, length); break; case 1: { @@ -1806,23 +1931,23 @@ FormatNumber( return TCL_ERROR; } if (NeedReversing(type)) { - *(*cursorPtr)++ = (unsigned char) wvalue; - *(*cursorPtr)++ = (unsigned char) (wvalue >> 8); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 16); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 24); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 32); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 40); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 48); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 56); + *(*cursorPtr)++ = UCHAR(wvalue); + *(*cursorPtr)++ = UCHAR(wvalue >> 8); + *(*cursorPtr)++ = UCHAR(wvalue >> 16); + *(*cursorPtr)++ = UCHAR(wvalue >> 24); + *(*cursorPtr)++ = UCHAR(wvalue >> 32); + *(*cursorPtr)++ = UCHAR(wvalue >> 40); + *(*cursorPtr)++ = UCHAR(wvalue >> 48); + *(*cursorPtr)++ = UCHAR(wvalue >> 56); } else { - *(*cursorPtr)++ = (unsigned char) (wvalue >> 56); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 48); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 40); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 32); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 24); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 16); - *(*cursorPtr)++ = (unsigned char) (wvalue >> 8); - *(*cursorPtr)++ = (unsigned char) wvalue; + *(*cursorPtr)++ = UCHAR(wvalue >> 56); + *(*cursorPtr)++ = UCHAR(wvalue >> 48); + *(*cursorPtr)++ = UCHAR(wvalue >> 40); + *(*cursorPtr)++ = UCHAR(wvalue >> 32); + *(*cursorPtr)++ = UCHAR(wvalue >> 24); + *(*cursorPtr)++ = UCHAR(wvalue >> 16); + *(*cursorPtr)++ = UCHAR(wvalue >> 8); + *(*cursorPtr)++ = UCHAR(wvalue); } return TCL_OK; @@ -1836,15 +1961,15 @@ FormatNumber( return TCL_ERROR; } if (NeedReversing(type)) { - *(*cursorPtr)++ = (unsigned char) value; - *(*cursorPtr)++ = (unsigned char) (value >> 8); - *(*cursorPtr)++ = (unsigned char) (value >> 16); - *(*cursorPtr)++ = (unsigned char) (value >> 24); + *(*cursorPtr)++ = UCHAR(value); + *(*cursorPtr)++ = UCHAR(value >> 8); + *(*cursorPtr)++ = UCHAR(value >> 16); + *(*cursorPtr)++ = UCHAR(value >> 24); } else { - *(*cursorPtr)++ = (unsigned char) (value >> 24); - *(*cursorPtr)++ = (unsigned char) (value >> 16); - *(*cursorPtr)++ = (unsigned char) (value >> 8); - *(*cursorPtr)++ = (unsigned char) value; + *(*cursorPtr)++ = UCHAR(value >> 24); + *(*cursorPtr)++ = UCHAR(value >> 16); + *(*cursorPtr)++ = UCHAR(value >> 8); + *(*cursorPtr)++ = UCHAR(value); } return TCL_OK; @@ -1858,11 +1983,11 @@ FormatNumber( return TCL_ERROR; } if (NeedReversing(type)) { - *(*cursorPtr)++ = (unsigned char) value; - *(*cursorPtr)++ = (unsigned char) (value >> 8); + *(*cursorPtr)++ = UCHAR(value); + *(*cursorPtr)++ = UCHAR(value >> 8); } else { - *(*cursorPtr)++ = (unsigned char) (value >> 8); - *(*cursorPtr)++ = (unsigned char) value; + *(*cursorPtr)++ = UCHAR(value >> 8); + *(*cursorPtr)++ = UCHAR(value); } return TCL_OK; @@ -1873,7 +1998,7 @@ FormatNumber( if (TclGetLongFromObj(interp, src, &value) != TCL_OK) { return TCL_ERROR; } - *(*cursorPtr)++ = (unsigned char) value; + *(*cursorPtr)++ = UCHAR(value); return TCL_OK; default: @@ -1978,7 +2103,7 @@ ScanNumber( value = (long) (buffer[3] + (buffer[2] << 8) + (buffer[1] << 16) - + (((long)buffer[0]) << 24)); + + (((long) buffer[0]) << 24)); } /* @@ -1991,9 +2116,9 @@ ScanNumber( if (flags & BINARY_UNSIGNED) { return Tcl_NewWideIntObj((Tcl_WideInt)(unsigned long)value); } - if ((value & (((unsigned int)1)<<31)) && (value > 0)) { - value -= (((unsigned int)1)<<31); - value -= (((unsigned int)1)<<31); + if ((value & (((unsigned) 1)<<31)) && (value > 0)) { + value -= (((unsigned) 1)<<31); + value -= (((unsigned) 1)<<31); } returnNumericObject: @@ -2006,13 +2131,13 @@ ScanNumber( hPtr = Tcl_CreateHashEntry(tablePtr, INT2PTR(value), &isNew); if (!isNew) { - return (Tcl_Obj *) Tcl_GetHashValue(hPtr); + return Tcl_GetHashValue(hPtr); } if (tablePtr->numEntries <= BINARY_SCAN_MAX_CACHE) { register Tcl_Obj *objPtr = Tcl_NewLongObj(value); Tcl_IncrRefCount(objPtr); - Tcl_SetHashValue(hPtr, (ClientData) objPtr); + Tcl_SetHashValue(hPtr, objPtr); return objPtr; } @@ -2139,9 +2264,725 @@ DeleteScanNumberCache( } /* + * ---------------------------------------------------------------------- + * + * NOTES -- + * + * Some measurements show that it is faster to use a table to to perform + * uuencode and base64 value encoding than to calculate the output (at + * least on intel P4 arch). + * + * Conversely using a lookup table for the decoding is slower than just + * calculating the values. We therefore use the fastest of each method. + * + * Presumably this has to do with the size of the tables. The base64 + * decode table is 255 bytes while the encode table is only 65 bytes. The + * choice likely depends on CPU memory cache sizes. + */ + +/* + *---------------------------------------------------------------------- + * + * BinaryEncodeHex -- + * + * Implement the [binary encode hex] binary encoding. clientData must be + * a table to convert values to hexadecimal digits. + * + * Results: + * Interp result set to an encoded byte array object + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +static int +BinaryEncodeHex( + ClientData clientData, + Tcl_Interp *interp, + int objc, + Tcl_Obj *const objv[]) +{ + Tcl_Obj *resultObj = NULL; + unsigned char *data = NULL; + unsigned char *cursor = NULL; + int offset = 0, count = 0; + + if (objc != 2) { + Tcl_WrongNumArgs(interp, 1, objv, "data"); + return TCL_ERROR; + } + + TclNewObj(resultObj); + data = Tcl_GetByteArrayFromObj(objv[1], &count); + cursor = Tcl_SetByteArrayLength(resultObj, count * 2); + for (offset = 0; offset < count; ++offset) { + *cursor++ = HexDigits[((data[offset] >> 4) & 0x0f)]; + *cursor++ = HexDigits[(data[offset] & 0x0f)]; + } + Tcl_SetObjResult(interp, resultObj); + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * BinaryDecodeHex -- + * + * Implement the [binary decode hex] binary encoding. + * + * Results: + * Interp result set to an decoded byte array object + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +static int +BinaryDecodeHex( + ClientData clientData, + Tcl_Interp *interp, + int objc, + Tcl_Obj *const objv[]) +{ + Tcl_Obj *resultObj = NULL; + unsigned char *data, *datastart, *dataend; + unsigned char *begin, *cursor, c; + int i, index, value, size, count = 0, cut = 0, strict = 0; + enum {OPT_STRICT }; + static const char *const optStrings[] = { "-strict", NULL }; + + if (objc < 2 || objc > 3) { + Tcl_WrongNumArgs(interp, 1, objv, "?options? data"); + return TCL_ERROR; + } + for (i = 1; i < objc-1; ++i) { + if (Tcl_GetIndexFromObj(interp, objv[i], optStrings, "option", + TCL_EXACT, &index) != TCL_OK) { + return TCL_ERROR; + } + switch (index) { + case OPT_STRICT: + strict = 1; + break; + } + } + + TclNewObj(resultObj); + datastart = data = (unsigned char *) + TclGetStringFromObj(objv[objc-1], &count); + dataend = data + count; + size = (count + 1) / 2; + begin = cursor = Tcl_SetByteArrayLength(resultObj, size); + while (data < dataend) { + value = 0; + for (i=0 ; i<2 ; i++) { + if (data >= dataend) { + value <<= 4; + break; + } + + c = *data++; + if (!isxdigit((int) c)) { + if (strict || !isspace(c)) { + goto badChar; + } + i--; + continue; + } + + value <<= 4; + c -= '0'; + if (c > 9) { + c += ('0' - 'A') + 10; + } + if (c > 16) { + c += ('A' - 'a'); + } + value |= (c & 0xf); + } + if (i < 2) { + cut++; + } + *cursor++ = UCHAR(value); + value = 0; + } + if (cut > size) { + cut = size; + } + Tcl_SetByteArrayLength(resultObj, cursor - begin - cut); + Tcl_SetObjResult(interp, resultObj); + return TCL_OK; + + badChar: + TclDecrRefCount(resultObj); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "invalid hexadecimal digit \"%c\" at position %d", + c, (int) (data - datastart - 1))); + return TCL_ERROR; +} + +/* + *---------------------------------------------------------------------- + * + * BinaryEncode64 -- + * + * This implements a generic 6 bit binary encoding. Input is broken into + * 6 bit chunks and a lookup table passed in via clientData is used to + * turn these values into output characters. This is used to implement + * base64 binary encodings. + * + * Results: + * Interp result set to an encoded byte array object + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +#define OUTPUT(c) \ + do { \ + *cursor++ = (c); \ + outindex++; \ + if (maxlen > 0 && cursor != limit) { \ + if (outindex == maxlen) { \ + memcpy(cursor, wrapchar, wrapcharlen); \ + cursor += wrapcharlen; \ + outindex = 0; \ + } \ + } \ + if (cursor > limit) { \ + Tcl_Panic("limit hit"); \ + } \ + } while (0) + +static int +BinaryEncode64( + ClientData clientData, + Tcl_Interp *interp, + int objc, + Tcl_Obj *const objv[]) +{ + Tcl_Obj *resultObj; + unsigned char *data, *cursor, *limit; + int maxlen = 0; + const char *wrapchar = "\n"; + int wrapcharlen = 1; + int offset, i, index, size, outindex = 0, count = 0; + enum {OPT_MAXLEN, OPT_WRAPCHAR }; + static const char *const optStrings[] = { "-maxlen", "-wrapchar", NULL }; + + if (objc < 2 || objc%2 != 0) { + Tcl_WrongNumArgs(interp, 1, objv, + "?-maxlen len? ?-wrapchar char? data"); + return TCL_ERROR; + } + for (i = 1; i < objc-1; i += 2) { + if (Tcl_GetIndexFromObj(interp, objv[i], optStrings, "option", + TCL_EXACT, &index) != TCL_OK) { + return TCL_ERROR; + } + switch (index) { + case OPT_MAXLEN: + if (Tcl_GetIntFromObj(interp, objv[i+1], &maxlen) != TCL_OK) { + return TCL_ERROR; + } + if (maxlen < 0) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "line length out of range", -1)); + Tcl_SetErrorCode(interp, "TCL", "BINARY", "ENCODE", + "LINE_LENGTH", NULL); + return TCL_ERROR; + } + break; + case OPT_WRAPCHAR: + wrapchar = Tcl_GetStringFromObj(objv[i+1], &wrapcharlen); + if (wrapcharlen == 0) { + maxlen = 0; + } + break; + } + } + + resultObj = Tcl_NewObj(); + data = Tcl_GetByteArrayFromObj(objv[objc-1], &count); + if (count > 0) { + size = (((count * 4) / 3) + 3) & ~3; /* ensure 4 byte chunks */ + if (maxlen > 0 && size > maxlen) { + int adjusted = size + (wrapcharlen * (size / maxlen)); + + if (size % maxlen == 0) { + adjusted -= wrapcharlen; + } + size = adjusted; + } + cursor = Tcl_SetByteArrayLength(resultObj, size); + limit = cursor + size; + for (offset = 0; offset < count; offset+=3) { + unsigned char d[3] = {0, 0, 0}; + + for (i = 0; i < 3 && offset+i < count; ++i) { + d[i] = data[offset + i]; + } + OUTPUT(B64Digits[d[0] >> 2]); + OUTPUT(B64Digits[((d[0] & 0x03) << 4) | (d[1] >> 4)]); + if (offset+1 < count) { + OUTPUT(B64Digits[((d[1] & 0x0f) << 2) | (d[2] >> 6)]); + } else { + OUTPUT(B64Digits[64]); + } + if (offset+2 < count) { + OUTPUT(B64Digits[d[2] & 0x3f]); + } else { + OUTPUT(B64Digits[64]); + } + } + } + Tcl_SetObjResult(interp, resultObj); + return TCL_OK; +} +#undef OUTPUT + +/* + *---------------------------------------------------------------------- + * + * BinaryEncodeUu -- + * + * This implements the uuencode binary encoding. Input is broken into 6 + * bit chunks and a lookup table is used to turn these values into output + * characters. This differs from the generic code above in that line + * lengths are also encoded. + * + * Results: + * Interp result set to an encoded byte array object + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +static int +BinaryEncodeUu( + ClientData clientData, + Tcl_Interp *interp, + int objc, + Tcl_Obj *const objv[]) +{ + Tcl_Obj *resultObj; + unsigned char *data, *start, *cursor; + int offset, count, rawLength, n, i, j, bits, index; + int lineLength = 61; + const unsigned char SingleNewline[] = { (unsigned char) '\n' }; + const unsigned char *wrapchar = SingleNewline; + int wrapcharlen = sizeof(SingleNewline); + enum { OPT_MAXLEN, OPT_WRAPCHAR }; + static const char *const optStrings[] = { "-maxlen", "-wrapchar", NULL }; + + if (objc < 2 || objc%2 != 0) { + Tcl_WrongNumArgs(interp, 1, objv, + "?-maxlen len? ?-wrapchar char? data"); + return TCL_ERROR; + } + for (i = 1; i < objc-1; i += 2) { + if (Tcl_GetIndexFromObj(interp, objv[i], optStrings, "option", + TCL_EXACT, &index) != TCL_OK) { + return TCL_ERROR; + } + switch (index) { + case OPT_MAXLEN: + if (Tcl_GetIntFromObj(interp, objv[i+1], &lineLength) != TCL_OK) { + return TCL_ERROR; + } + if (lineLength < 3 || lineLength > 85) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "line length out of range", -1)); + Tcl_SetErrorCode(interp, "TCL", "BINARY", "ENCODE", + "LINE_LENGTH", NULL); + return TCL_ERROR; + } + break; + case OPT_WRAPCHAR: + wrapchar = Tcl_GetByteArrayFromObj(objv[i+1], &wrapcharlen); + break; + } + } + + /* + * Allocate the buffer. This is a little bit too long, but is "good + * enough". + */ + + resultObj = Tcl_NewObj(); + offset = 0; + data = Tcl_GetByteArrayFromObj(objv[objc-1], &count); + rawLength = (lineLength - 1) * 3 / 4; + start = cursor = Tcl_SetByteArrayLength(resultObj, + (lineLength + wrapcharlen) * + ((count + (rawLength - 1)) / rawLength)); + n = bits = 0; + + /* + * Encode the data. Each output line first has the length of raw data + * encoded by the output line described in it by one encoded byte, then + * the encoded data follows (encoding each 6 bits as one character). + * Encoded lines are always terminated by a newline. + */ + + while (offset < count) { + int lineLen = count - offset; + + if (lineLen > rawLength) { + lineLen = rawLength; + } + *cursor++ = UueDigits[lineLen]; + for (i=0 ; i<lineLen ; i++) { + n <<= 8; + n |= data[offset++]; + for (bits += 8; bits > 6 ; bits -= 6) { + *cursor++ = UueDigits[(n >> (bits-6)) & 0x3f]; + } + } + if (bits > 0) { + n <<= 8; + *cursor++ = UueDigits[(n >> (bits + 2)) & 0x3f]; + bits = 0; + } + for (j=0 ; j<wrapcharlen ; ++j) { + *cursor++ = wrapchar[j]; + } + } + + /* + * Fix the length of the output bytearray. + */ + + Tcl_SetByteArrayLength(resultObj, cursor-start); + Tcl_SetObjResult(interp, resultObj); + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * BinaryDecodeUu -- + * + * Decode a uuencoded string. + * + * Results: + * Interp result set to an byte array object + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +static int +BinaryDecodeUu( + ClientData clientData, + Tcl_Interp *interp, + int objc, + Tcl_Obj *const objv[]) +{ + Tcl_Obj *resultObj = NULL; + unsigned char *data, *datastart, *dataend; + unsigned char *begin, *cursor; + int i, index, size, count = 0, strict = 0, lineLen; + unsigned char c; + enum {OPT_STRICT }; + static const char *const optStrings[] = { "-strict", NULL }; + + if (objc < 2 || objc > 3) { + Tcl_WrongNumArgs(interp, 1, objv, "?options? data"); + return TCL_ERROR; + } + for (i = 1; i < objc-1; ++i) { + if (Tcl_GetIndexFromObj(interp, objv[i], optStrings, "option", + TCL_EXACT, &index) != TCL_OK) { + return TCL_ERROR; + } + switch (index) { + case OPT_STRICT: + strict = 1; + break; + } + } + + TclNewObj(resultObj); + datastart = data = (unsigned char *) + TclGetStringFromObj(objv[objc-1], &count); + dataend = data + count; + size = ((count + 3) & ~3) * 3 / 4; + begin = cursor = Tcl_SetByteArrayLength(resultObj, size); + lineLen = -1; + + /* + * The decoding loop. First, we get the length of line (strictly, the + * number of data bytes we expect to generate from the line) we're + * processing this time round if it is not already known (i.e., when the + * lineLen variable is set to the magic value, -1). + */ + + while (data < dataend) { + char d[4] = {0, 0, 0, 0}; + + if (lineLen < 0) { + c = *data++; + if (c < 32 || c > 96) { + if (strict || !isspace(c)) { + goto badUu; + } + i--; + continue; + } + lineLen = (c - 32) & 0x3f; + } + + /* + * Now we read a four-character grouping. + */ + + for (i=0 ; i<4 ; i++) { + if (data < dataend) { + d[i] = c = *data++; + if (c < 32 || c > 96) { + if (strict) { + if (!isspace(c)) { + goto badUu; + } else if (c == '\n') { + goto shortUu; + } + } + i--; + continue; + } + } + } + + /* + * Translate that grouping into (up to) three binary bytes output. + */ + + if (lineLen > 0) { + *cursor++ = (((d[0] - 0x20) & 0x3f) << 2) + | (((d[1] - 0x20) & 0x3f) >> 4); + if (--lineLen > 0) { + *cursor++ = (((d[1] - 0x20) & 0x3f) << 4) + | (((d[2] - 0x20) & 0x3f) >> 2); + if (--lineLen > 0) { + *cursor++ = (((d[2] - 0x20) & 0x3f) << 6) + | (((d[3] - 0x20) & 0x3f)); + lineLen--; + } + } + } + + /* + * If we've reached the end of the line, skip until we process a + * newline. + */ + + if (lineLen == 0 && data < dataend) { + lineLen = -1; + do { + c = *data++; + if (c == '\n') { + break; + } else if (c >= 32 && c <= 96) { + data--; + break; + } else if (strict || !isspace(c)) { + goto badUu; + } + } while (data < dataend); + } + } + + /* + * Sanity check, clean up and finish. + */ + + if (lineLen > 0 && strict) { + goto shortUu; + } + Tcl_SetByteArrayLength(resultObj, cursor - begin); + Tcl_SetObjResult(interp, resultObj); + return TCL_OK; + + shortUu: + Tcl_SetObjResult(interp, Tcl_ObjPrintf("short uuencode data")); + Tcl_SetErrorCode(interp, "TCL", "BINARY", "DECODE", "SHORT", NULL); + TclDecrRefCount(resultObj); + return TCL_ERROR; + + badUu: + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "invalid uuencode character \"%c\" at position %d", + c, (int) (data - datastart - 1))); + Tcl_SetErrorCode(interp, "TCL", "BINARY", "DECODE", "INVALID", NULL); + TclDecrRefCount(resultObj); + return TCL_ERROR; +} + +/* + *---------------------------------------------------------------------- + * + * BinaryDecode64 -- + * + * Decode a base64 encoded string. + * + * Results: + * Interp result set to an byte array object + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +static int +BinaryDecode64( + ClientData clientData, + Tcl_Interp *interp, + int objc, + Tcl_Obj *const objv[]) +{ + Tcl_Obj *resultObj = NULL; + unsigned char *data, *datastart, *dataend, c = '\0'; + unsigned char *begin = NULL; + unsigned char *cursor = NULL; + int strict = 0; + int i, index, size, cut = 0, count = 0; + enum { OPT_STRICT }; + static const char *const optStrings[] = { "-strict", NULL }; + + if (objc < 2 || objc > 3) { + Tcl_WrongNumArgs(interp, 1, objv, "?options? data"); + return TCL_ERROR; + } + for (i = 1; i < objc-1; ++i) { + if (Tcl_GetIndexFromObj(interp, objv[i], optStrings, "option", + TCL_EXACT, &index) != TCL_OK) { + return TCL_ERROR; + } + switch (index) { + case OPT_STRICT: + strict = 1; + break; + } + } + + TclNewObj(resultObj); + datastart = data = (unsigned char *) + TclGetStringFromObj(objv[objc-1], &count); + dataend = data + count; + size = ((count + 3) & ~3) * 3 / 4; + begin = cursor = Tcl_SetByteArrayLength(resultObj, size); + while (data < dataend) { + unsigned long value = 0; + + /* + * Decode the current block. Each base64 block consists of four input + * characters A-Z, a-z, 0-9, +, or /. Each character supplies six bits + * of output data, so each block's output is 24 bits (three bytes) in + * length. The final block can be shorter by one or two bytes, denoted + * by the input ending with one or two ='s, respectively. + */ + + for (i = 0; i < 4; i++) { + /* + * Get the next input character. At end of input, pad with at most + * two ='s. If more than two ='s would be needed, instead discard + * the block read thus far. + */ + + if (data < dataend) { + c = *data++; + } else if (i > 1) { + c = '='; + } else { + cut += 3; + break; + } + + /* + * Load the character into the block value. Handle ='s specially + * because they're only valid as the last character or two of the + * final block of input. Unless strict mode is enabled, skip any + * input whitespace characters. + */ + + if (cut) { + if (c == '=' && i > 1) { + value <<= 6; + cut++; + } else if (!strict && isspace(c)) { + i--; + } else { + goto bad64; + } + } else if (c >= 'A' && c <= 'Z') { + value = (value << 6) | ((c - 'A') & 0x3f); + } else if (c >= 'a' && c <= 'z') { + value = (value << 6) | ((c - 'a' + 26) & 0x3f); + } else if (c >= '0' && c <= '9') { + value = (value << 6) | ((c - '0' + 52) & 0x3f); + } else if (c == '+') { + value = (value << 6) | 0x3e; + } else if (c == '/') { + value = (value << 6) | 0x3f; + } else if (c == '=') { + value <<= 6; + cut++; + } else if (strict || !isspace(c)) { + goto bad64; + } else { + i--; + } + } + *cursor++ = UCHAR((value >> 16) & 0xff); + *cursor++ = UCHAR((value >> 8) & 0xff); + *cursor++ = UCHAR(value & 0xff); + + /* + * Since = is only valid within the final block, if it was encountered + * but there are still more input characters, confirm that strict mode + * is off and all subsequent characters are whitespace. + */ + + if (cut && data < dataend) { + if (strict) { + goto bad64; + } + for (; data < dataend; data++) { + if (!isspace(*data)) { + goto bad64; + } + } + } + } + Tcl_SetByteArrayLength(resultObj, cursor - begin - cut); + Tcl_SetObjResult(interp, resultObj); + return TCL_OK; + + bad64: + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "invalid base64 character \"%c\" at position %d", + (char) c, (int) (data - datastart - 1))); + TclDecrRefCount(resultObj); + return TCL_ERROR; +} + +/* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */ + |