Helper module for uuencode and binhex coders
This commit is contained in:
Jack Jansen
parent
a68bfe29ec
commit
727811907c
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@ -300,6 +300,9 @@ rotor rotormodule.c # enigma-inspired encryption
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# Objective-C (incomplete!!!)
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#objc.c
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# Helper module for various ascii-encoders
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binascii binasciimodule.c
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# Example -- included for reference only:
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# xx xxmodule.c
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@ -0,0 +1,602 @@
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/***********************************************************
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Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum,
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Amsterdam, The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/*
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** Routines to represent binary data in ASCII and vice-versa
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**
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** This module currently supports the following encodings:
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** uuencode:
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** each line encodes 45 bytes (except possibly the last)
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** First char encodes (binary) length, rest data
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** each char encodes 6 bits, as follows:
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** binary: 01234567 abcdefgh ijklmnop
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** ascii: 012345 67abcd efghij klmnop
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** ASCII encoding method is "excess-space": 000000 is encoded as ' ', etc.
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** short binary data is zero-extended (so the bits are always in the
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** right place), this does *not* reflect in the length.
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** hqx:
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** File starts with introductory text, real data starts and ends
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** with colons.
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** Data consists of three similar parts: info, datafork, resourcefork.
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** Each part is protected (at the end) with a 16-bit crc
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** The binary data is run-length encoded, and then ascii-fied:
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** binary: 01234567 abcdefgh ijklmnop
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** ascii: 012345 67abcd efghij klmnop
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** ASCII encoding is table-driven, see the code.
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** Short binary data results in the runt ascii-byte being output with
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** the bits in the right place.
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**
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** While I was reading dozens of programs that encode or decode the formats
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** here (documentation? hihi:-) I have formulated Jansen's Observation:
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**
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** Programs that encode binary data in ASCII are written in
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** such a style that they are as unreadable as possible. Devices used
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** include unnecessary global variables, burying important tables
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** in unrelated sourcefiles, putting functions in include files,
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** using seemingly-descriptive variable names for different purposes,
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** calls to empty subroutines and a host of others.
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**
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** I have attempted to break with this tradition, but I guess that that
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** does make the performance sub-optimal. Oh well, too bad...
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**
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** Jack Jansen, CWI, July 1995.
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*/
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#include "Python.h"
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static PyObject *Error;
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static PyObject *Incomplete;
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/*
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** hqx lookup table, ascii->binary.
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*/
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#define RUNCHAR 0x90
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#define DONE 0x7F
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#define SKIP 0x7E
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#define FAIL 0x7D
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static unsigned char table_a2b_hqx[256] = {
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/* ^@ ^A ^B ^C ^D ^E ^F ^G */
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/* 0*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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/* \b \t \n ^K ^L \r ^N ^O */
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/* 1*/ FAIL, FAIL, SKIP, FAIL, FAIL, SKIP, FAIL, FAIL,
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/* ^P ^Q ^R ^S ^T ^U ^V ^W */
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/* 2*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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/* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
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/* 3*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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/* ! " # $ % & ' */
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/* 4*/ FAIL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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/* ( ) * + , - . / */
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/* 5*/ 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, FAIL, FAIL,
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/* 0 1 2 3 4 5 6 7 */
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/* 6*/ 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, FAIL,
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/* 8 9 : ; < = > ? */
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/* 7*/ 0x14, 0x15, DONE, FAIL, FAIL, FAIL, FAIL, FAIL,
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/* @ A B C D E F G */
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/* 8*/ 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D,
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/* H I J K L M N O */
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/* 9*/ 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, FAIL,
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/* P Q R S T U V W */
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/*10*/ 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, FAIL,
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/* X Y Z [ \ ] ^ _ */
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/*11*/ 0x2C, 0x2D, 0x2E, 0x2F, FAIL, FAIL, FAIL, FAIL,
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/* ` a b c d e f g */
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/*12*/ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, FAIL,
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/* h i j k l m n o */
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/*13*/ 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, FAIL, FAIL,
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/* p q r s t u v w */
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/*14*/ 0x3D, 0x3E, 0x3F, FAIL, FAIL, FAIL, FAIL, FAIL,
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/* x y z { | } ~ ^? */
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/*15*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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/*16*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
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};
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static unsigned char table_b2a_hqx[] =
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"!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr";
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static unsigned short crctab_hqx[256] = {
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0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
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0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
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0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
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0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
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0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
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0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
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0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
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0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
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0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
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0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
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0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
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0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
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0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
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0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
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0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
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0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
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0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
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0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
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0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
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0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
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0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
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0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
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0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
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0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
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0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
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0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
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0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
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0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
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0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
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0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
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0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
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0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,
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};
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static char doc_a2b_uu[] = "(ascii) -> bin. Decode a line of uuencoded data";
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static PyObject *
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binascii_a2b_uu(self, args)
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PyObject *self;
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PyObject *args;
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{
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unsigned char *ascii_data, *bin_data;
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int leftbits = 0;
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unsigned char this_ch;
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unsigned int leftchar = 0;
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PyObject *rv;
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int ascii_len, bin_len;
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if ( !PyArg_ParseTuple(args, "s#", &ascii_data, &ascii_len) )
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return NULL;
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/* First byte: binary data length (in bytes) */
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bin_len = (*ascii_data++ - ' ') & 077;
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ascii_len--;
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/* Allocate the buffer */
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if ( (rv=PyString_FromStringAndSize(NULL, bin_len)) == NULL )
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return NULL;
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bin_data = (unsigned char *)PyString_AsString(rv);
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for( ; bin_len > 0 ; ascii_len--, ascii_data++ ) {
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this_ch = *ascii_data;
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if ( this_ch == '\n' || this_ch == '\r' || ascii_len <= 0) {
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/*
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** Whitespace. Assume some spaces got eaten at
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** end-of-line. (We check this later)
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*/
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this_ch = 0;
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} else {
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/* Check the character for legality */
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if ( this_ch < ' ' || this_ch > (' ' + 63)) {
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PyErr_SetString(Error, "Illegal char");
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Py_DECREF(rv);
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return NULL;
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}
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this_ch = (this_ch - ' ') & 077;
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}
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/*
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** Shift it in on the low end, and see if there's
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** a byte ready for output.
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*/
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leftchar = (leftchar << 6) | (this_ch);
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leftbits += 6;
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if ( leftbits >= 8 ) {
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leftbits -= 8;
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*bin_data++ = (leftchar >> leftbits) & 0xff;
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leftchar &= ((1 << leftbits) - 1);
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bin_len--;
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}
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}
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/*
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** Finally, check that if there's anything left on the line
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** that it's whitespace only.
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*/
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while( ascii_len-- > 0 ) {
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this_ch = *ascii_data++;
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if ( this_ch != ' ' && this_ch != '\n' && this_ch != '\r' ) {
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PyErr_SetString(Error, "Trailing garbage");
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Py_DECREF(rv);
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return NULL;
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}
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}
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return rv;
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}
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static char doc_b2a_uu[] = "(bin) -> ascii. Uuencode line of data";
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static PyObject *
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binascii_b2a_uu(self, args)
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PyObject *self;
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PyObject *args;
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{
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unsigned char *ascii_data, *bin_data;
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int leftbits = 0;
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unsigned char this_ch;
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unsigned int leftchar = 0;
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PyObject *rv;
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int bin_len;
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if ( !PyArg_ParseTuple(args, "s#", &bin_data, &bin_len) )
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return NULL;
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if ( bin_len > 45 ) {
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/* The 45 is a limit that appears in all uuencode's */
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PyErr_SetString(Error, "At most 45 bytes at once");
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return NULL;
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}
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/* We're lazy and allocate to much (fixed up later) */
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if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2)) == NULL )
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return NULL;
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ascii_data = (unsigned char *)PyString_AsString(rv);
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/* Store the length */
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*ascii_data++ = ' ' + (bin_len & 077);
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for( ; bin_len > 0 || leftbits != 0 ; bin_len--, bin_data++ ) {
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/* Shift the data (or padding) into our buffer */
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if ( bin_len > 0 ) /* Data */
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leftchar = (leftchar << 8) | *bin_data;
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else /* Padding */
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leftchar <<= 8;
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leftbits += 8;
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/* See if there are 6-bit groups ready */
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while ( leftbits >= 6 ) {
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this_ch = (leftchar >> (leftbits-6)) & 0x3f;
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leftbits -= 6;
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*ascii_data++ = this_ch + ' ';
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}
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}
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*ascii_data++ = '\n'; /* Append a courtesy newline */
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_PyString_Resize(&rv, (ascii_data - (unsigned char *)PyString_AsString(rv)));
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return rv;
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}
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static char doc_a2b_hqx[] = "ascii -> bin, done. Decode .hqx coding";
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static PyObject *
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binascii_a2b_hqx(self, args)
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PyObject *self;
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PyObject *args;
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{
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unsigned char *ascii_data, *bin_data;
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int leftbits = 0;
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unsigned char this_ch;
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unsigned int leftchar;
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PyObject *rv;
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int len;
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int done = 0;
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if ( !PyArg_ParseTuple(args, "s#", &ascii_data, &len) )
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return NULL;
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/* Allocate a string that is too big (fixed later) */
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if ( (rv=PyString_FromStringAndSize(NULL, len)) == NULL )
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return NULL;
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bin_data = (unsigned char *)PyString_AsString(rv);
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for( ; len > 0 ; len--, ascii_data++ ) {
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/* Get the byte and look it up */
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this_ch = table_a2b_hqx[*ascii_data];
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if ( this_ch == SKIP )
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continue;
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if ( this_ch == FAIL ) {
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PyErr_SetString(Error, "Illegal char");
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Py_DECREF(rv);
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return NULL;
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}
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if ( this_ch == DONE ) {
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/* The terminating colon */
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done = 1;
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break;
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}
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/* Shift it into the buffer and see if any bytes are ready */
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leftchar = (leftchar << 6) | (this_ch);
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leftbits += 6;
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if ( leftbits >= 8 ) {
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leftbits -= 8;
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*bin_data++ = (leftchar >> leftbits) & 0xff;
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leftchar &= ((1 << leftbits) - 1);
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}
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}
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if ( leftbits && !done ) {
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PyErr_SetString(Incomplete,
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"String has incomplete number of bytes");
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Py_DECREF(rv);
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return NULL;
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}
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_PyString_Resize(&rv, (bin_data - (unsigned char *)PyString_AsString(rv)));
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if ( rv )
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return Py_BuildValue("Oi", rv, done);
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return NULL;
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}
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static char doc_rlecode_hqx[] = "Binhex RLE-code binary data";
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static PyObject *
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binascii_rlecode_hqx(self, args)
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PyObject *self;
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PyObject *args;
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{
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unsigned char *in_data, *out_data;
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PyObject *rv;
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unsigned char ch;
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int in, inend, len;
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if ( !PyArg_ParseTuple(args, "s#", &in_data, &len) )
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return NULL;
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/* 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");
|
||||
}
|
||||
Loading…
Reference in New Issue