Helper module for uuencode and binhex coders
diff --git a/Modules/Setup.in b/Modules/Setup.in
index 0f9a2ff..a0939a9 100644
--- a/Modules/Setup.in
+++ b/Modules/Setup.in
@@ -300,6 +300,9 @@
# Objective-C (incomplete!!!)
#objc.c
+# Helper module for various ascii-encoders
+binascii binasciimodule.c
+
# Example -- included for reference only:
# xx xxmodule.c
diff --git a/Modules/binascii.c b/Modules/binascii.c
new file mode 100644
index 0000000..100165d
--- /dev/null
+++ b/Modules/binascii.c
@@ -0,0 +1,602 @@
+/***********************************************************
+Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum,
+Amsterdam, The Netherlands.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/*
+** Routines to represent binary data in ASCII and vice-versa
+**
+** This module currently supports the following encodings:
+** uuencode:
+** each line encodes 45 bytes (except possibly the last)
+** First char encodes (binary) length, rest data
+** each char encodes 6 bits, as follows:
+** binary: 01234567 abcdefgh ijklmnop
+** ascii: 012345 67abcd efghij klmnop
+** ASCII encoding method is "excess-space": 000000 is encoded as ' ', etc.
+** short binary data is zero-extended (so the bits are always in the
+** right place), this does *not* reflect in the length.
+** hqx:
+** File starts with introductory text, real data starts and ends
+** with colons.
+** Data consists of three similar parts: info, datafork, resourcefork.
+** Each part is protected (at the end) with a 16-bit crc
+** The binary data is run-length encoded, and then ascii-fied:
+** binary: 01234567 abcdefgh ijklmnop
+** ascii: 012345 67abcd efghij klmnop
+** ASCII encoding is table-driven, see the code.
+** Short binary data results in the runt ascii-byte being output with
+** the bits in the right place.
+**
+** While I was reading dozens of programs that encode or decode the formats
+** here (documentation? hihi:-) I have formulated Jansen's Observation:
+**
+** Programs that encode binary data in ASCII are written in
+** such a style that they are as unreadable as possible. Devices used
+** include unnecessary global variables, burying important tables
+** in unrelated sourcefiles, putting functions in include files,
+** using seemingly-descriptive variable names for different purposes,
+** calls to empty subroutines and a host of others.
+**
+** I have attempted to break with this tradition, but I guess that that
+** does make the performance sub-optimal. Oh well, too bad...
+**
+** Jack Jansen, CWI, July 1995.
+*/
+
+
+#include "Python.h"
+
+static PyObject *Error;
+static PyObject *Incomplete;
+
+/*
+** hqx lookup table, ascii->binary.
+*/
+
+#define RUNCHAR 0x90
+
+#define DONE 0x7F
+#define SKIP 0x7E
+#define FAIL 0x7D
+
+static unsigned char table_a2b_hqx[256] = {
+/* ^@ ^A ^B ^C ^D ^E ^F ^G */
+/* 0*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+/* \b \t \n ^K ^L \r ^N ^O */
+/* 1*/ FAIL, FAIL, SKIP, FAIL, FAIL, SKIP, FAIL, FAIL,
+/* ^P ^Q ^R ^S ^T ^U ^V ^W */
+/* 2*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+/* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
+/* 3*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+/* ! " # $ % & ' */
+/* 4*/ FAIL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
+/* ( ) * + , - . / */
+/* 5*/ 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, FAIL, FAIL,
+/* 0 1 2 3 4 5 6 7 */
+/* 6*/ 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, FAIL,
+/* 8 9 : ; < = > ? */
+/* 7*/ 0x14, 0x15, DONE, FAIL, FAIL, FAIL, FAIL, FAIL,
+/* @ A B C D E F G */
+/* 8*/ 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D,
+/* H I J K L M N O */
+/* 9*/ 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, FAIL,
+/* P Q R S T U V W */
+/*10*/ 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, FAIL,
+/* X Y Z [ \ ] ^ _ */
+/*11*/ 0x2C, 0x2D, 0x2E, 0x2F, FAIL, FAIL, FAIL, FAIL,
+/* ` a b c d e f g */
+/*12*/ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, FAIL,
+/* h i j k l m n o */
+/*13*/ 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, FAIL, FAIL,
+/* p q r s t u v w */
+/*14*/ 0x3D, 0x3E, 0x3F, FAIL, FAIL, FAIL, FAIL, FAIL,
+/* x y z { | } ~ ^? */
+/*15*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+/*16*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
+};
+
+static unsigned char table_b2a_hqx[] =
+ "!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr";
+
+static unsigned short crctab_hqx[256] = {
+ 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
+ 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
+ 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
+ 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
+ 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
+ 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
+ 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
+ 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
+ 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
+ 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
+ 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
+ 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
+ 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
+ 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
+ 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
+ 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
+ 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
+ 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
+ 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
+ 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
+ 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
+ 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
+ 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
+ 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
+ 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
+ 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
+ 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
+ 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
+ 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
+ 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
+ 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
+ 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,
+};
+
+static char doc_a2b_uu[] = "(ascii) -> bin. Decode a line of uuencoded data";
+
+static PyObject *
+binascii_a2b_uu(self, args)
+ PyObject *self;
+ PyObject *args;
+{
+ unsigned char *ascii_data, *bin_data;
+ int leftbits = 0;
+ unsigned char this_ch;
+ unsigned int leftchar = 0;
+ PyObject *rv;
+ int ascii_len, bin_len;
+
+ if ( !PyArg_ParseTuple(args, "s#", &ascii_data, &ascii_len) )
+ return NULL;
+
+ /* First byte: binary data length (in bytes) */
+ bin_len = (*ascii_data++ - ' ') & 077;
+ ascii_len--;
+
+ /* Allocate the buffer */
+ if ( (rv=PyString_FromStringAndSize(NULL, bin_len)) == NULL )
+ return NULL;
+ bin_data = (unsigned char *)PyString_AsString(rv);
+
+ for( ; bin_len > 0 ; ascii_len--, ascii_data++ ) {
+ this_ch = *ascii_data;
+ if ( this_ch == '\n' || this_ch == '\r' || ascii_len <= 0) {
+ /*
+ ** Whitespace. Assume some spaces got eaten at
+ ** end-of-line. (We check this later)
+ */
+ this_ch = 0;
+ } else {
+ /* Check the character for legality */
+ if ( this_ch < ' ' || this_ch > (' ' + 63)) {
+ PyErr_SetString(Error, "Illegal char");
+ Py_DECREF(rv);
+ return NULL;
+ }
+ this_ch = (this_ch - ' ') & 077;
+ }
+ /*
+ ** Shift it in on the low end, and see if there's
+ ** a byte ready for output.
+ */
+ leftchar = (leftchar << 6) | (this_ch);
+ leftbits += 6;
+ if ( leftbits >= 8 ) {
+ leftbits -= 8;
+ *bin_data++ = (leftchar >> leftbits) & 0xff;
+ leftchar &= ((1 << leftbits) - 1);
+ bin_len--;
+ }
+ }
+ /*
+ ** Finally, check that if there's anything left on the line
+ ** that it's whitespace only.
+ */
+ while( ascii_len-- > 0 ) {
+ this_ch = *ascii_data++;
+ if ( this_ch != ' ' && this_ch != '\n' && this_ch != '\r' ) {
+ PyErr_SetString(Error, "Trailing garbage");
+ Py_DECREF(rv);
+ return NULL;
+ }
+ }
+ return rv;
+}
+
+static char doc_b2a_uu[] = "(bin) -> ascii. Uuencode line of data";
+
+static PyObject *
+binascii_b2a_uu(self, args)
+ PyObject *self;
+ PyObject *args;
+{
+ unsigned char *ascii_data, *bin_data;
+ int leftbits = 0;
+ unsigned char this_ch;
+ unsigned int leftchar = 0;
+ PyObject *rv;
+ int bin_len;
+
+ if ( !PyArg_ParseTuple(args, "s#", &bin_data, &bin_len) )
+ return NULL;
+ if ( bin_len > 45 ) {
+ /* The 45 is a limit that appears in all uuencode's */
+ PyErr_SetString(Error, "At most 45 bytes at once");
+ return NULL;
+ }
+
+ /* We're lazy and allocate to much (fixed up later) */
+ if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2)) == NULL )
+ return NULL;
+ ascii_data = (unsigned char *)PyString_AsString(rv);
+
+ /* Store the length */
+ *ascii_data++ = ' ' + (bin_len & 077);
+
+ for( ; bin_len > 0 || leftbits != 0 ; bin_len--, bin_data++ ) {
+ /* Shift the data (or padding) into our buffer */
+ if ( bin_len > 0 ) /* Data */
+ leftchar = (leftchar << 8) | *bin_data;
+ else /* Padding */
+ leftchar <<= 8;
+ leftbits += 8;
+
+ /* See if there are 6-bit groups ready */
+ while ( leftbits >= 6 ) {
+ this_ch = (leftchar >> (leftbits-6)) & 0x3f;
+ leftbits -= 6;
+ *ascii_data++ = this_ch + ' ';
+ }
+ }
+ *ascii_data++ = '\n'; /* Append a courtesy newline */
+
+ _PyString_Resize(&rv, (ascii_data - (unsigned char *)PyString_AsString(rv)));
+ return rv;
+}
+
+static char doc_a2b_hqx[] = "ascii -> bin, done. Decode .hqx coding";
+
+static PyObject *
+binascii_a2b_hqx(self, args)
+ PyObject *self;
+ PyObject *args;
+{
+ unsigned char *ascii_data, *bin_data;
+ int leftbits = 0;
+ unsigned char this_ch;
+ unsigned int leftchar;
+ PyObject *rv;
+ int len;
+ int done = 0;
+
+ if ( !PyArg_ParseTuple(args, "s#", &ascii_data, &len) )
+ return NULL;
+
+ /* Allocate a string that is too big (fixed later) */
+ if ( (rv=PyString_FromStringAndSize(NULL, len)) == NULL )
+ return NULL;
+ bin_data = (unsigned char *)PyString_AsString(rv);
+
+ for( ; len > 0 ; len--, ascii_data++ ) {
+ /* Get the byte and look it up */
+ this_ch = table_a2b_hqx[*ascii_data];
+ if ( this_ch == SKIP )
+ continue;
+ if ( this_ch == FAIL ) {
+ PyErr_SetString(Error, "Illegal char");
+ Py_DECREF(rv);
+ return NULL;
+ }
+ if ( this_ch == DONE ) {
+ /* The terminating colon */
+ done = 1;
+ break;
+ }
+
+ /* Shift it into the buffer and see if any bytes are ready */
+ leftchar = (leftchar << 6) | (this_ch);
+ leftbits += 6;
+ if ( leftbits >= 8 ) {
+ leftbits -= 8;
+ *bin_data++ = (leftchar >> leftbits) & 0xff;
+ leftchar &= ((1 << leftbits) - 1);
+ }
+ }
+
+ if ( leftbits && !done ) {
+ PyErr_SetString(Incomplete,
+ "String has incomplete number of bytes");
+ Py_DECREF(rv);
+ return NULL;
+ }
+ _PyString_Resize(&rv, (bin_data - (unsigned char *)PyString_AsString(rv)));
+ if ( rv )
+ return Py_BuildValue("Oi", rv, done);
+ return NULL;
+}
+
+static char doc_rlecode_hqx[] = "Binhex RLE-code binary data";
+
+static PyObject *
+binascii_rlecode_hqx(self, args)
+ PyObject *self;
+ PyObject *args;
+{
+ unsigned char *in_data, *out_data;
+ PyObject *rv;
+ unsigned char ch;
+ int in, inend, len;
+
+ if ( !PyArg_ParseTuple(args, "s#", &in_data, &len) )
+ return NULL;
+
+ /* Worst case: output is twice as big as input (fixed later) */
+ if ( (rv=PyString_FromStringAndSize(NULL, len*2)) == NULL )
+ return NULL;
+ out_data = (unsigned char *)PyString_AsString(rv);
+
+ for( in=0; in<len; in++) {
+ ch = in_data[in];
+ if ( ch == RUNCHAR ) {
+ /* RUNCHAR. Escape it. */
+ *out_data++ = RUNCHAR;
+ *out_data++ = 0;
+ } else {
+ /* Check how many following are the same */
+ for(inend=in+1;
+ inend<len && in_data[inend] == ch &&
+ inend < in+255;
+ inend++) ;
+ if ( inend - in > 3 && inend-in != RUNCHAR ) {
+ /* More than 3 in a row. Output RLE.
+ ** The special case of exactly 0x90 repeats will result in a single
+ ** byte now and a 0x8f repeat next time around
+ */
+ *out_data++ = ch;
+ *out_data++ = RUNCHAR;
+ *out_data++ = inend-in;
+ in = inend-1;
+ } else {
+ /* Less than 3. Output the byte itself */
+ *out_data++ = ch;
+ }
+ }
+ }
+ _PyString_Resize(&rv, (out_data - (unsigned char *)PyString_AsString(rv)));
+ return rv;
+}
+
+static char doc_b2a_hqx[] = "Encode .hqx data";
+
+static PyObject *
+binascii_b2a_hqx(self, args)
+ PyObject *self;
+ PyObject *args;
+{
+ unsigned char *ascii_data, *bin_data;
+ int leftbits = 0;
+ unsigned char this_ch;
+ unsigned int leftchar;
+ PyObject *rv;
+ int len;
+
+ if ( !PyArg_ParseTuple(args, "s#", &bin_data, &len) )
+ return NULL;
+
+ /* Allocate a buffer that is at least large enough */
+ if ( (rv=PyString_FromStringAndSize(NULL, len*2)) == NULL )
+ return NULL;
+ ascii_data = (unsigned char *)PyString_AsString(rv);
+
+ for( ; len > 0 ; len--, bin_data++ ) {
+ /* Shift into our buffer, and output any 6bits ready */
+ leftchar = (leftchar << 8) | *bin_data;
+ leftbits += 8;
+ while ( leftbits >= 6 ) {
+ this_ch = (leftchar >> (leftbits-6)) & 0x3f;
+ leftbits -= 6;
+ *ascii_data++ = table_b2a_hqx[this_ch];
+ }
+ }
+ /* Output a possible runt byte */
+ if ( leftbits ) {
+ leftchar <<= (6-leftbits);
+ *ascii_data++ = table_b2a_hqx[leftchar & 0x3f];
+ }
+ _PyString_Resize(&rv, (ascii_data - (unsigned char *)PyString_AsString(rv)));
+ return rv;
+}
+
+static char doc_rledecode_hqx[] = "Decode hexbin RLE-coded string";
+
+static PyObject *
+binascii_rledecode_hqx(self, args)
+ PyObject *self;
+ PyObject *args;
+{
+ unsigned char *in_data, *out_data;
+ unsigned char in_byte, in_repeat;
+ PyObject *rv;
+ int in_len, out_len, out_len_left;
+
+ if ( !PyArg_ParseTuple(args, "s#", &in_data, &in_len) )
+ return NULL;
+
+ /* Empty string is a special case */
+ if ( in_len == 0 )
+ return Py_BuildValue("s", "");
+
+ /* Allocate a buffer of reasonable size. Resized when needed */
+ out_len = in_len*2;
+ if ( (rv=PyString_FromStringAndSize(NULL, out_len)) == NULL )
+ return NULL;
+ out_len_left = out_len;
+ out_data = (unsigned char *)PyString_AsString(rv);
+
+ /*
+ ** We need two macros here to get/put bytes and handle
+ ** end-of-buffer for input and output strings.
+ */
+#define INBYTE(b) \
+ do { \
+ if ( --in_len < 0 ) { \
+ PyErr_SetString(Incomplete, ""); \
+ Py_DECREF(rv); \
+ return NULL; \
+ } \
+ b = *in_data++; \
+ } while(0)
+
+#define OUTBYTE(b) \
+ do { \
+ if ( --out_len_left < 0 ) { \
+ _PyString_Resize(&rv, 2*out_len); \
+ if ( rv == NULL ) return NULL; \
+ out_data = (unsigned char *)PyString_AsString(rv) + out_len; \
+ out_len_left = out_len; \
+ out_len = out_len * 2; \
+ } \
+ *out_data++ = b; \
+ } while(0)
+
+ /*
+ ** Handle first byte separately (since we have to get angry
+ ** in case of an orphaned RLE code).
+ */
+ INBYTE(in_byte);
+
+ if (in_byte == RUNCHAR) {
+ INBYTE(in_repeat);
+ if (in_repeat != 0) {
+ /* Note Error, not Incomplete (which is at the end
+ ** of the string only). This is a programmer error.
+ */
+ PyErr_SetString(Error, "Orphaned RLE code at start");
+ Py_DECREF(rv);
+ return NULL;
+ }
+ OUTBYTE(RUNCHAR);
+ } else {
+ OUTBYTE(in_byte);
+ }
+
+ while( in_len > 0 ) {
+ INBYTE(in_byte);
+
+ if (in_byte == RUNCHAR) {
+ INBYTE(in_repeat);
+ if ( in_repeat == 0 ) {
+ /* Just an escaped RUNCHAR value */
+ OUTBYTE(RUNCHAR);
+ } else {
+ /* Pick up value and output a sequence of it */
+ in_byte = out_data[-1];
+ while ( --in_repeat > 0 )
+ OUTBYTE(in_byte);
+ }
+ } else {
+ /* Normal byte */
+ OUTBYTE(in_byte);
+ }
+ }
+ _PyString_Resize(&rv, (out_data - (unsigned char *)PyString_AsString(rv)));
+ return rv;
+}
+
+static char doc_crc_hqx[] = "(data, oldcrc) -> newcrc. Compute hqx CRC incrementally";
+
+static PyObject *
+binascii_crc_hqx(self, args)
+ PyObject *self;
+ PyObject *args;
+{
+ unsigned char *bin_data;
+ unsigned int crc;
+ int len;
+
+ if ( !PyArg_ParseTuple(args, "s#i", &bin_data, &len, &crc) )
+ return NULL;
+
+ while(len--) {
+ crc=((crc<<8)&0xff00)^crctab_hqx[((crc>>8)&0xff)^*bin_data++];
+ }
+
+ return Py_BuildValue("i", crc);
+}
+
+/* List of functions defined in the module */
+
+static struct PyMethodDef binascii_module_methods[] = {
+ {"a2b_uu", binascii_a2b_uu, 1, doc_a2b_uu},
+ {"b2a_uu", binascii_b2a_uu, 1, doc_b2a_uu},
+ {"a2b_hqx", binascii_a2b_hqx, 1, doc_a2b_hqx},
+ {"b2a_hqx", binascii_b2a_hqx, 1, doc_b2a_hqx},
+ {"rlecode_hqx", binascii_rlecode_hqx, 1,
+ doc_rlecode_hqx},
+ {"rledecode_hqx", binascii_rledecode_hqx, 1,
+ doc_rledecode_hqx},
+ {"crc_hqx", binascii_crc_hqx, 1, doc_crc_hqx},
+ {NULL, NULL} /* sentinel */
+};
+
+
+/* Initialization function for the module (*must* be called initbinascii) */
+static char doc_binascii[] = "Conversion between binary data and ASCII";
+
+void
+initbinascii()
+{
+ PyObject *m, *d, *x;
+
+ /* Create the module and add the functions */
+ m = Py_InitModule("binascii", binascii_module_methods);
+
+ d = PyModule_GetDict(m);
+ x = PyString_FromString(doc_binascii);
+ PyDict_SetItemString(d, "__doc__", x);
+
+ Error = PyString_FromString("binascii.Error");
+ PyDict_SetItemString(d, "Error", Error);
+ Incomplete = PyString_FromString("binascii.Incomplete");
+ PyDict_SetItemString(d, "Incomplete", Incomplete);
+
+ /* Check for errors */
+ if (PyErr_Occurred())
+ Py_FatalError("can't initialize module binascii");
+}