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1316 lines
41 KiB
C
1316 lines
41 KiB
C
/*
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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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** base64:
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** Line breaks are insignificant, but lines are at most 76 chars
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** each char encodes 6 bits, in similar order as uucode/hqx. Encoding
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** is done via a table.
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** Short binary data is filled (in ASCII) with '='.
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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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** Added support for quoted-printable encoding, based on rfc 1521 et al
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** quoted-printable encoding specifies that non printable characters (anything
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** below 32 and above 126) be encoded as =XX where XX is the hexadecimal value
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** of the character. It also specifies some other behavior to enable 8bit data
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** in a mail message with little difficulty (maximum line sizes, protecting
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** some cases of whitespace, etc).
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**
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** Brandon Long, September 2001.
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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 char table_a2b_base64[] = {
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-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
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-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
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-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
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52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, /* Note PAD->0 */
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-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
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15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
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-1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
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41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
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};
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#define BASE64_PAD '='
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/* Max binary chunk size; limited only by available memory */
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#define BASE64_MAXBIN (INT_MAX/2 - sizeof(PyStringObject))
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static unsigned char table_b2a_base64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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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(PyObject *self, 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, "t#:a2b_uu", &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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** The 64 in stead of the expected 63 is because
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** there are a few uuencodes out there that use
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** '`' as zero instead of space.
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*/
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if ( this_ch < ' ' || this_ch > (' ' + 64)) {
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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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/* Extra '`' may be written as padding in some cases */
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if ( this_ch != ' ' && this_ch != ' '+64 &&
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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(PyObject *self, 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#:b2a_uu", &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 -
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(unsigned char *)PyString_AsString(rv)));
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return rv;
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}
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static int
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binascii_find_valid(unsigned char *s, int slen, int num)
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{
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/* Finds & returns the (num+1)th
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** valid character for base64, or -1 if none.
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*/
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int ret = -1;
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unsigned char c, b64val;
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while ((slen > 0) && (ret == -1)) {
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c = *s;
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b64val = table_a2b_base64[c & 0x7f];
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if ( ((c <= 0x7f) && (b64val != (unsigned char)-1)) ) {
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if (num == 0)
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ret = *s;
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num--;
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}
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s++;
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slen--;
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}
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return ret;
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}
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static char doc_a2b_base64[] = "(ascii) -> bin. Decode a line of base64 data";
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static PyObject *
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binascii_a2b_base64(PyObject *self, 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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int quad_pos = 0;
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if ( !PyArg_ParseTuple(args, "t#:a2b_base64", &ascii_data, &ascii_len) )
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return NULL;
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if ( ascii_len == 0) {
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PyErr_SetString(Error, "Cannot decode empty input");
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return NULL;
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}
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bin_len = ((ascii_len+3)/4)*3; /* Upper bound, corrected later */
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|
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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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bin_len = 0;
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for( ; ascii_len > 0; ascii_len--, ascii_data++) {
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this_ch = *ascii_data;
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if (this_ch > 0x7f ||
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this_ch == '\r' || this_ch == '\n' || this_ch == ' ')
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continue;
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|
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/* Check for pad sequences and ignore
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** the invalid ones.
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*/
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if (this_ch == BASE64_PAD) {
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if ( (quad_pos < 2) ||
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((quad_pos == 2) &&
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(binascii_find_valid(ascii_data, ascii_len, 1)
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!= BASE64_PAD)) )
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{
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continue;
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}
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else {
|
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/* A pad sequence means no more input.
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** We've already interpreted the data
|
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** from the quad at this point.
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*/
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leftbits = 0;
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break;
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}
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}
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|
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this_ch = table_a2b_base64[*ascii_data];
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if ( this_ch == (unsigned char) -1 )
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continue;
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|
|
/*
|
|
** Shift it in on the low end, and see if there's
|
|
** a byte ready for output.
|
|
*/
|
|
quad_pos = (quad_pos + 1) & 0x03;
|
|
leftchar = (leftchar << 6) | (this_ch);
|
|
leftbits += 6;
|
|
|
|
if ( leftbits >= 8 ) {
|
|
leftbits -= 8;
|
|
*bin_data++ = (leftchar >> leftbits) & 0xff;
|
|
bin_len++;
|
|
leftchar &= ((1 << leftbits) - 1);
|
|
}
|
|
}
|
|
|
|
if (leftbits != 0) {
|
|
PyErr_SetString(Error, "Incorrect padding");
|
|
Py_DECREF(rv);
|
|
return NULL;
|
|
}
|
|
|
|
/* and set string size correctly */
|
|
_PyString_Resize(&rv, bin_len);
|
|
return rv;
|
|
}
|
|
|
|
static char doc_b2a_base64[] = "(bin) -> ascii. Base64-code line of data";
|
|
|
|
static PyObject *
|
|
binascii_b2a_base64(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#:b2a_base64", &bin_data, &bin_len) )
|
|
return NULL;
|
|
if ( bin_len > BASE64_MAXBIN ) {
|
|
PyErr_SetString(Error, "Too much data for base64 line");
|
|
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);
|
|
|
|
for( ; bin_len > 0 ; bin_len--, bin_data++ ) {
|
|
/* Shift the data into our buffer */
|
|
leftchar = (leftchar << 8) | *bin_data;
|
|
leftbits += 8;
|
|
|
|
/* See if there are 6-bit groups ready */
|
|
while ( leftbits >= 6 ) {
|
|
this_ch = (leftchar >> (leftbits-6)) & 0x3f;
|
|
leftbits -= 6;
|
|
*ascii_data++ = table_b2a_base64[this_ch];
|
|
}
|
|
}
|
|
if ( leftbits == 2 ) {
|
|
*ascii_data++ = table_b2a_base64[(leftchar&3) << 4];
|
|
*ascii_data++ = BASE64_PAD;
|
|
*ascii_data++ = BASE64_PAD;
|
|
} else if ( leftbits == 4 ) {
|
|
*ascii_data++ = table_b2a_base64[(leftchar&0xf) << 2];
|
|
*ascii_data++ = BASE64_PAD;
|
|
}
|
|
*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(PyObject *self, PyObject *args)
|
|
{
|
|
unsigned char *ascii_data, *bin_data;
|
|
int leftbits = 0;
|
|
unsigned char this_ch;
|
|
unsigned int leftchar = 0;
|
|
PyObject *rv;
|
|
int len;
|
|
int done = 0;
|
|
|
|
if ( !PyArg_ParseTuple(args, "t#:a2b_hqx", &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) {
|
|
PyObject *rrv = Py_BuildValue("Oi", rv, done);
|
|
Py_DECREF(rv);
|
|
return rrv;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static char doc_rlecode_hqx[] = "Binhex RLE-code binary data";
|
|
|
|
static PyObject *
|
|
binascii_rlecode_hqx(PyObject *self, PyObject *args)
|
|
{
|
|
unsigned char *in_data, *out_data;
|
|
PyObject *rv;
|
|
unsigned char ch;
|
|
int in, inend, len;
|
|
|
|
if ( !PyArg_ParseTuple(args, "s#:rlecode_hqx", &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 ) {
|
|
/* More than 3 in a row. Output RLE. */
|
|
*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(PyObject *self, PyObject *args)
|
|
{
|
|
unsigned char *ascii_data, *bin_data;
|
|
int leftbits = 0;
|
|
unsigned char this_ch;
|
|
unsigned int leftchar = 0;
|
|
PyObject *rv;
|
|
int len;
|
|
|
|
if ( !PyArg_ParseTuple(args, "s#:b2a_hqx", &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(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#:rledecode_hqx", &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-1; \
|
|
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(PyObject *self, PyObject *args)
|
|
{
|
|
unsigned char *bin_data;
|
|
unsigned int crc;
|
|
int len;
|
|
|
|
if ( !PyArg_ParseTuple(args, "s#i:crc_hqx", &bin_data, &len, &crc) )
|
|
return NULL;
|
|
|
|
while(len--) {
|
|
crc=((crc<<8)&0xff00)^crctab_hqx[((crc>>8)&0xff)^*bin_data++];
|
|
}
|
|
|
|
return Py_BuildValue("i", crc);
|
|
}
|
|
|
|
static char doc_crc32[] =
|
|
"(data, oldcrc = 0) -> newcrc. Compute CRC-32 incrementally";
|
|
|
|
/* Crc - 32 BIT ANSI X3.66 CRC checksum files
|
|
Also known as: ISO 3307
|
|
**********************************************************************|
|
|
* *|
|
|
* Demonstration program to compute the 32-bit CRC used as the frame *|
|
|
* check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71 *|
|
|
* and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level *|
|
|
* protocol). The 32-bit FCS was added via the Federal Register, *|
|
|
* 1 June 1982, p.23798. I presume but don't know for certain that *|
|
|
* this polynomial is or will be included in CCITT V.41, which *|
|
|
* defines the 16-bit CRC (often called CRC-CCITT) polynomial. FIPS *|
|
|
* PUB 78 says that the 32-bit FCS reduces otherwise undetected *|
|
|
* errors by a factor of 10^-5 over 16-bit FCS. *|
|
|
* *|
|
|
**********************************************************************|
|
|
|
|
Copyright (C) 1986 Gary S. Brown. You may use this program, or
|
|
code or tables extracted from it, as desired without restriction.
|
|
|
|
First, the polynomial itself and its table of feedback terms. The
|
|
polynomial is
|
|
X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
|
|
Note that we take it "backwards" and put the highest-order term in
|
|
the lowest-order bit. The X^32 term is "implied"; the LSB is the
|
|
X^31 term, etc. The X^0 term (usually shown as "+1") results in
|
|
the MSB being 1.
|
|
|
|
Note that the usual hardware shift register implementation, which
|
|
is what we're using (we're merely optimizing it by doing eight-bit
|
|
chunks at a time) shifts bits into the lowest-order term. In our
|
|
implementation, that means shifting towards the right. Why do we
|
|
do it this way? Because the calculated CRC must be transmitted in
|
|
order from highest-order term to lowest-order term. UARTs transmit
|
|
characters in order from LSB to MSB. By storing the CRC this way,
|
|
we hand it to the UART in the order low-byte to high-byte; the UART
|
|
sends each low-bit to hight-bit; and the result is transmission bit
|
|
by bit from highest- to lowest-order term without requiring any bit
|
|
shuffling on our part. Reception works similarly.
|
|
|
|
The feedback terms table consists of 256, 32-bit entries. Notes:
|
|
|
|
1. The table can be generated at runtime if desired; code to do so
|
|
is shown later. It might not be obvious, but the feedback
|
|
terms simply represent the results of eight shift/xor opera-
|
|
tions for all combinations of data and CRC register values.
|
|
|
|
2. The CRC accumulation logic is the same for all CRC polynomials,
|
|
be they sixteen or thirty-two bits wide. You simply choose the
|
|
appropriate table. Alternatively, because the table can be
|
|
generated at runtime, you can start by generating the table for
|
|
the polynomial in question and use exactly the same "updcrc",
|
|
if your application needn't simultaneously handle two CRC
|
|
polynomials. (Note, however, that XMODEM is strange.)
|
|
|
|
3. For 16-bit CRCs, the table entries need be only 16 bits wide;
|
|
of course, 32-bit entries work OK if the high 16 bits are zero.
|
|
|
|
4. The values must be right-shifted by eight bits by the "updcrc"
|
|
logic; the shift must be unsigned (bring in zeroes). On some
|
|
hardware you could probably optimize the shift in assembler by
|
|
using byte-swap instructions.
|
|
********************************************************************/
|
|
|
|
static unsigned long crc_32_tab[256] = {
|
|
0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
|
|
0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL,
|
|
0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL,
|
|
0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL,
|
|
0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL,
|
|
0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL,
|
|
0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL,
|
|
0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL,
|
|
0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL,
|
|
0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL,
|
|
0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL,
|
|
0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL,
|
|
0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL,
|
|
0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL,
|
|
0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL,
|
|
0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL,
|
|
0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL,
|
|
0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL,
|
|
0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL,
|
|
0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL,
|
|
0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL,
|
|
0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL,
|
|
0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL,
|
|
0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL,
|
|
0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL,
|
|
0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL,
|
|
0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL,
|
|
0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL,
|
|
0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL,
|
|
0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL,
|
|
0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL,
|
|
0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL,
|
|
0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL,
|
|
0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL,
|
|
0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL,
|
|
0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL,
|
|
0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL,
|
|
0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL,
|
|
0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL,
|
|
0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL,
|
|
0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL,
|
|
0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL,
|
|
0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL,
|
|
0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL,
|
|
0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL,
|
|
0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL,
|
|
0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL,
|
|
0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL,
|
|
0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL,
|
|
0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL,
|
|
0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL,
|
|
0x2d02ef8dUL
|
|
};
|
|
|
|
static PyObject *
|
|
binascii_crc32(PyObject *self, PyObject *args)
|
|
{ /* By Jim Ahlstrom; All rights transferred to CNRI */
|
|
unsigned char *bin_data;
|
|
unsigned long crc = 0UL; /* initial value of CRC */
|
|
int len;
|
|
|
|
if ( !PyArg_ParseTuple(args, "s#|l:crc32", &bin_data, &len, &crc) )
|
|
return NULL;
|
|
|
|
crc = crc ^ 0xFFFFFFFFUL;
|
|
while(len--)
|
|
crc = crc_32_tab[(crc ^ *bin_data++) & 0xffUL] ^ (crc >> 8);
|
|
/* Note: (crc >> 8) MUST zero fill on left */
|
|
return Py_BuildValue("l", crc ^ 0xFFFFFFFFUL);
|
|
}
|
|
|
|
|
|
static PyObject *
|
|
binascii_hexlify(PyObject *self, PyObject *args)
|
|
{
|
|
char* argbuf;
|
|
int arglen;
|
|
PyObject *retval;
|
|
char* retbuf;
|
|
int i, j;
|
|
|
|
if (!PyArg_ParseTuple(args, "t#:b2a_hex", &argbuf, &arglen))
|
|
return NULL;
|
|
|
|
retval = PyString_FromStringAndSize(NULL, arglen*2);
|
|
if (!retval)
|
|
return NULL;
|
|
retbuf = PyString_AsString(retval);
|
|
if (!retbuf)
|
|
goto finally;
|
|
|
|
/* make hex version of string, taken from shamodule.c */
|
|
for (i=j=0; i < arglen; i++) {
|
|
char c;
|
|
c = (argbuf[i] >> 4) & 0xf;
|
|
c = (c>9) ? c+'a'-10 : c + '0';
|
|
retbuf[j++] = c;
|
|
c = argbuf[i] & 0xf;
|
|
c = (c>9) ? c+'a'-10 : c + '0';
|
|
retbuf[j++] = c;
|
|
}
|
|
return retval;
|
|
|
|
finally:
|
|
Py_DECREF(retval);
|
|
return NULL;
|
|
}
|
|
|
|
static char doc_hexlify[] =
|
|
"b2a_hex(data) -> s; Hexadecimal representation of binary data.\n\
|
|
\n\
|
|
This function is also available as \"hexlify()\".";
|
|
|
|
|
|
static int
|
|
to_int(int c)
|
|
{
|
|
if (isdigit(c))
|
|
return c - '0';
|
|
else {
|
|
if (isupper(c))
|
|
c = tolower(c);
|
|
if (c >= 'a' && c <= 'f')
|
|
return c - 'a' + 10;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
static PyObject *
|
|
binascii_unhexlify(PyObject *self, PyObject *args)
|
|
{
|
|
char* argbuf;
|
|
int arglen;
|
|
PyObject *retval;
|
|
char* retbuf;
|
|
int i, j;
|
|
|
|
if (!PyArg_ParseTuple(args, "s#:a2b_hex", &argbuf, &arglen))
|
|
return NULL;
|
|
|
|
/* XXX What should we do about strings with an odd length? Should
|
|
* we add an implicit leading zero, or a trailing zero? For now,
|
|
* raise an exception.
|
|
*/
|
|
if (arglen % 2) {
|
|
PyErr_SetString(PyExc_TypeError, "Odd-length string");
|
|
return NULL;
|
|
}
|
|
|
|
retval = PyString_FromStringAndSize(NULL, (arglen/2));
|
|
if (!retval)
|
|
return NULL;
|
|
retbuf = PyString_AsString(retval);
|
|
if (!retbuf)
|
|
goto finally;
|
|
|
|
for (i=j=0; i < arglen; i += 2) {
|
|
int top = to_int(Py_CHARMASK(argbuf[i]));
|
|
int bot = to_int(Py_CHARMASK(argbuf[i+1]));
|
|
if (top == -1 || bot == -1) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"Non-hexadecimal digit found");
|
|
goto finally;
|
|
}
|
|
retbuf[j++] = (top << 4) + bot;
|
|
}
|
|
return retval;
|
|
|
|
finally:
|
|
Py_DECREF(retval);
|
|
return NULL;
|
|
}
|
|
|
|
static char doc_unhexlify[] =
|
|
"a2b_hex(hexstr) -> s; Binary data of hexadecimal representation.\n\
|
|
\n\
|
|
hexstr must contain an even number of hex digits (upper or lower case).\n\
|
|
This function is also available as \"unhexlify()\"";
|
|
|
|
static int table_hex[128] = {
|
|
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
|
|
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
|
|
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1, -1,-1,-1,-1,
|
|
-1,10,11,12, 13,14,15,-1, -1,-1,-1,-1, -1,-1,-1,-1,
|
|
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
|
|
-1,10,11,12, 13,14,15,-1, -1,-1,-1,-1, -1,-1,-1,-1,
|
|
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1
|
|
};
|
|
|
|
#define hexval(c) table_hex[(unsigned int)(c)]
|
|
|
|
#define MAXLINESIZE 76
|
|
|
|
static char doc_a2b_qp[] = "Decode a string of qp-encoded data";
|
|
|
|
static PyObject*
|
|
binascii_a2b_qp(PyObject *self, PyObject *args, PyObject *kwargs)
|
|
{
|
|
unsigned int in, out;
|
|
char ch;
|
|
unsigned char *data, *odata;
|
|
unsigned int datalen = 0;
|
|
PyObject *rv;
|
|
static char *kwlist[] = {"data", "header", NULL};
|
|
int header = 0;
|
|
|
|
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|i", kwlist, &data,
|
|
&datalen, &header))
|
|
return NULL;
|
|
|
|
/* We allocate the output same size as input, this is overkill */
|
|
odata = (unsigned char *) calloc(1, datalen);
|
|
|
|
if (odata == NULL) {
|
|
PyErr_NoMemory();
|
|
return NULL;
|
|
}
|
|
|
|
in = out = 0;
|
|
while (in < datalen) {
|
|
if (data[in] == '=') {
|
|
in++;
|
|
if (in >= datalen) break;
|
|
/* Soft line breaks */
|
|
if ((data[in] == '\n') || (data[in] == '\r') ||
|
|
(data[in] == ' ') || (data[in] == '\t')) {
|
|
if (data[in] != '\n') {
|
|
while (in < datalen && data[in] != '\n') in++;
|
|
}
|
|
if (in < datalen) in++;
|
|
}
|
|
else if (data[in] == '=') {
|
|
/* broken case from broken python qp */
|
|
odata[out++] = '=';
|
|
in++;
|
|
}
|
|
else if (((data[in] >= 'A' && data[in] <= 'F') ||
|
|
(data[in] >= 'a' && data[in] <= 'f') ||
|
|
(data[in] >= '0' && data[in] <= '9')) &&
|
|
((data[in+1] >= 'A' && data[in+1] <= 'F') ||
|
|
(data[in+1] >= 'a' && data[in+1] <= 'f') ||
|
|
(data[in+1] >= '0' && data[in+1] <= '9'))) {
|
|
/* hexval */
|
|
ch = hexval(data[in]) << 4;
|
|
in++;
|
|
ch |= hexval(data[in]);
|
|
in++;
|
|
odata[out++] = ch;
|
|
}
|
|
else {
|
|
odata[out++] = '=';
|
|
}
|
|
}
|
|
else if (header && data[in] == '_') {
|
|
odata[out++] = ' ';
|
|
in++;
|
|
}
|
|
else {
|
|
odata[out] = data[in];
|
|
in++;
|
|
out++;
|
|
}
|
|
}
|
|
if ((rv = PyString_FromStringAndSize((char *)odata, out)) == NULL) {
|
|
free (odata);
|
|
return NULL;
|
|
}
|
|
free (odata);
|
|
return rv;
|
|
}
|
|
|
|
static int
|
|
to_hex (unsigned char ch, unsigned char *s)
|
|
{
|
|
unsigned int uvalue = ch;
|
|
|
|
s[1] = "0123456789ABCDEF"[uvalue % 16];
|
|
uvalue = (uvalue / 16);
|
|
s[0] = "0123456789ABCDEF"[uvalue % 16];
|
|
return 0;
|
|
}
|
|
|
|
static char doc_b2a_qp[] =
|
|
"b2a_qp(data, quotetabs=0, istext=1, header=0) -> s; \n\
|
|
Encode a string using quoted-printable encoding. \n\
|
|
\n\
|
|
On encoding, when istext is set, newlines are not encoded, and white \n\
|
|
space at end of lines is. When istext is not set, \\r and \\n (CR/LF) are \n\
|
|
both encoded. When quotetabs is set, space and tabs are encoded.";
|
|
|
|
/* XXX: This is ridiculously complicated to be backward compatible
|
|
* (mostly) with the quopri module. It doesn't re-create the quopri
|
|
* module bug where text ending in CRLF has the CR encoded */
|
|
static PyObject*
|
|
binascii_b2a_qp (PyObject *self, PyObject *args, PyObject *kwargs)
|
|
{
|
|
unsigned int in, out;
|
|
unsigned char *data, *odata;
|
|
unsigned int datalen = 0, odatalen = 0;
|
|
PyObject *rv;
|
|
unsigned int linelen = 0;
|
|
static char *kwlist[] = {"data", "quotetabs", "istext", "header", NULL};
|
|
int istext = 1;
|
|
int quotetabs = 0;
|
|
int header = 0;
|
|
unsigned char ch;
|
|
int crlf = 0;
|
|
unsigned char *p;
|
|
|
|
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|iii", kwlist, &data,
|
|
&datalen, "etabs, &istext, &header))
|
|
return NULL;
|
|
|
|
/* See if this string is using CRLF line ends */
|
|
/* XXX: this function has the side effect of converting all of
|
|
* the end of lines to be the same depending on this detection
|
|
* here */
|
|
p = (unsigned char *) strchr((char *)data, '\n');
|
|
if ((p != NULL) && (p > data) && (*(p-1) == '\r'))
|
|
crlf = 1;
|
|
|
|
/* First, scan to see how many characters need to be encoded */
|
|
in = 0;
|
|
while (in < datalen) {
|
|
if ((data[in] > 126) ||
|
|
(data[in] == '=') ||
|
|
(header && data[in] == '_') ||
|
|
((data[in] == '.') && (linelen == 1)) ||
|
|
(!istext && ((data[in] == '\r') || (data[in] == '\n'))) ||
|
|
((data[in] == '\t' || data[in] == ' ') && (in + 1 == datalen)) ||
|
|
((data[in] < 33) &&
|
|
(data[in] != '\r') && (data[in] != '\n') &&
|
|
(quotetabs && ((data[in] != '\t') || (data[in] != ' ')))))
|
|
{
|
|
if ((linelen + 3) >= MAXLINESIZE) {
|
|
linelen = 0;
|
|
if (crlf)
|
|
odatalen += 3;
|
|
else
|
|
odatalen += 2;
|
|
}
|
|
linelen += 3;
|
|
odatalen += 3;
|
|
in++;
|
|
}
|
|
else {
|
|
if (istext &&
|
|
((data[in] == '\n') ||
|
|
((in+1 < datalen) && (data[in] == '\r') &&
|
|
(data[in+1] == '\n'))))
|
|
{
|
|
linelen = 0;
|
|
/* Protect against whitespace on end of line */
|
|
if (in && ((data[in-1] == ' ') || (data[in-1] == '\t')))
|
|
odatalen += 2;
|
|
if (crlf)
|
|
odatalen += 2;
|
|
else
|
|
odatalen += 1;
|
|
if (data[in] == '\r')
|
|
in += 2;
|
|
else
|
|
in++;
|
|
}
|
|
else {
|
|
if ((in + 1 != datalen) &&
|
|
(data[in+1] != '\n') &&
|
|
(linelen + 1) >= MAXLINESIZE) {
|
|
linelen = 0;
|
|
if (crlf)
|
|
odatalen += 3;
|
|
else
|
|
odatalen += 2;
|
|
}
|
|
linelen++;
|
|
odatalen++;
|
|
in++;
|
|
}
|
|
}
|
|
}
|
|
|
|
odata = (unsigned char *) calloc(1, odatalen);
|
|
|
|
if (odata == NULL) {
|
|
PyErr_NoMemory();
|
|
return NULL;
|
|
}
|
|
|
|
in = out = linelen = 0;
|
|
while (in < datalen) {
|
|
if ((data[in] > 126) ||
|
|
(data[in] == '=') ||
|
|
(header && data[in] == '_') ||
|
|
((data[in] == '.') && (linelen == 1)) ||
|
|
(!istext && ((data[in] == '\r') || (data[in] == '\n'))) ||
|
|
((data[in] == '\t' || data[in] == ' ') && (in + 1 == datalen)) ||
|
|
((data[in] < 33) &&
|
|
(data[in] != '\r') && (data[in] != '\n') &&
|
|
(quotetabs && ((data[in] != '\t') || (data[in] != ' ')))))
|
|
{
|
|
if ((linelen + 3 )>= MAXLINESIZE) {
|
|
odata[out++] = '=';
|
|
if (crlf) odata[out++] = '\r';
|
|
odata[out++] = '\n';
|
|
linelen = 0;
|
|
}
|
|
odata[out++] = '=';
|
|
to_hex(data[in], &odata[out]);
|
|
out += 2;
|
|
in++;
|
|
linelen += 3;
|
|
}
|
|
else {
|
|
if (istext &&
|
|
((data[in] == '\n') ||
|
|
((in+1 < datalen) && (data[in] == '\r') &&
|
|
(data[in+1] == '\n'))))
|
|
{
|
|
linelen = 0;
|
|
/* Protect against whitespace on end of line */
|
|
if (out && ((odata[out-1] == ' ') || (odata[out-1] == '\t'))) {
|
|
ch = odata[out-1];
|
|
odata[out-1] = '=';
|
|
to_hex(ch, &odata[out]);
|
|
out += 2;
|
|
}
|
|
|
|
if (crlf) odata[out++] = '\r';
|
|
odata[out++] = '\n';
|
|
if (data[in] == '\r')
|
|
in += 2;
|
|
else
|
|
in++;
|
|
}
|
|
else {
|
|
if ((in + 1 != datalen) &&
|
|
(data[in+1] != '\n') &&
|
|
(linelen + 1) >= MAXLINESIZE) {
|
|
odata[out++] = '=';
|
|
if (crlf) odata[out++] = '\r';
|
|
odata[out++] = '\n';
|
|
linelen = 0;
|
|
}
|
|
linelen++;
|
|
if (header && data[in] == ' ') {
|
|
odata[out++] = '_';
|
|
in++;
|
|
}
|
|
else {
|
|
odata[out++] = data[in++];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if ((rv = PyString_FromStringAndSize((char *)odata, out)) == NULL) {
|
|
free (odata);
|
|
return NULL;
|
|
}
|
|
free (odata);
|
|
return rv;
|
|
}
|
|
|
|
/* List of functions defined in the module */
|
|
|
|
static struct PyMethodDef binascii_module_methods[] = {
|
|
{"a2b_uu", binascii_a2b_uu, METH_VARARGS, doc_a2b_uu},
|
|
{"b2a_uu", binascii_b2a_uu, METH_VARARGS, doc_b2a_uu},
|
|
{"a2b_base64", binascii_a2b_base64, METH_VARARGS, doc_a2b_base64},
|
|
{"b2a_base64", binascii_b2a_base64, METH_VARARGS, doc_b2a_base64},
|
|
{"a2b_hqx", binascii_a2b_hqx, METH_VARARGS, doc_a2b_hqx},
|
|
{"b2a_hqx", binascii_b2a_hqx, METH_VARARGS, doc_b2a_hqx},
|
|
{"b2a_hex", binascii_hexlify, METH_VARARGS, doc_hexlify},
|
|
{"a2b_hex", binascii_unhexlify, METH_VARARGS, doc_unhexlify},
|
|
{"hexlify", binascii_hexlify, METH_VARARGS, doc_hexlify},
|
|
{"unhexlify", binascii_unhexlify, METH_VARARGS, doc_unhexlify},
|
|
{"rlecode_hqx", binascii_rlecode_hqx, METH_VARARGS, doc_rlecode_hqx},
|
|
{"rledecode_hqx", binascii_rledecode_hqx, METH_VARARGS,
|
|
doc_rledecode_hqx},
|
|
{"crc_hqx", binascii_crc_hqx, METH_VARARGS, doc_crc_hqx},
|
|
{"crc32", binascii_crc32, METH_VARARGS, doc_crc32},
|
|
{"a2b_qp", (PyCFunction)binascii_a2b_qp, METH_VARARGS | METH_KEYWORDS,
|
|
doc_a2b_qp},
|
|
{"b2a_qp", (PyCFunction)binascii_b2a_qp, METH_VARARGS | METH_KEYWORDS,
|
|
doc_b2a_qp},
|
|
{NULL, NULL} /* sentinel */
|
|
};
|
|
|
|
|
|
/* Initialization function for the module (*must* be called initbinascii) */
|
|
static char doc_binascii[] = "Conversion between binary data and ASCII";
|
|
|
|
DL_EXPORT(void)
|
|
initbinascii(void)
|
|
{
|
|
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);
|
|
Py_XDECREF(x);
|
|
|
|
Error = PyErr_NewException("binascii.Error", NULL, NULL);
|
|
PyDict_SetItemString(d, "Error", Error);
|
|
Incomplete = PyErr_NewException("binascii.Incomplete", NULL, NULL);
|
|
PyDict_SetItemString(d, "Incomplete", Incomplete);
|
|
}
|