/* | |
** Routines to represent binary data in ASCII and vice-versa | |
** | |
** This module currently supports the following encodings: | |
** uuencode: | |
** each line encodes 45 bytes (except possibly the last) | |
** First char encodes (binary) length, rest data | |
** each char encodes 6 bits, as follows: | |
** binary: 01234567 abcdefgh ijklmnop | |
** ascii: 012345 67abcd efghij klmnop | |
** ASCII encoding method is "excess-space": 000000 is encoded as ' ', etc. | |
** short binary data is zero-extended (so the bits are always in the | |
** right place), this does *not* reflect in the length. | |
** base64: | |
** Line breaks are insignificant, but lines are at most 76 chars | |
** each char encodes 6 bits, in similar order as uucode/hqx. Encoding | |
** is done via a table. | |
** Short binary data is filled (in ASCII) with '='. | |
** hqx: | |
** File starts with introductory text, real data starts and ends | |
** with colons. | |
** Data consists of three similar parts: info, datafork, resourcefork. | |
** Each part is protected (at the end) with a 16-bit crc | |
** The binary data is run-length encoded, and then ascii-fied: | |
** binary: 01234567 abcdefgh ijklmnop | |
** ascii: 012345 67abcd efghij klmnop | |
** ASCII encoding is table-driven, see the code. | |
** Short binary data results in the runt ascii-byte being output with | |
** the bits in the right place. | |
** | |
** While I was reading dozens of programs that encode or decode the formats | |
** here (documentation? hihi:-) I have formulated Jansen's Observation: | |
** | |
** Programs that encode binary data in ASCII are written in | |
** such a style that they are as unreadable as possible. Devices used | |
** include unnecessary global variables, burying important tables | |
** in unrelated sourcefiles, putting functions in include files, | |
** using seemingly-descriptive variable names for different purposes, | |
** calls to empty subroutines and a host of others. | |
** | |
** I have attempted to break with this tradition, but I guess that that | |
** does make the performance sub-optimal. Oh well, too bad... | |
** | |
** Jack Jansen, CWI, July 1995. | |
** | |
** Added support for quoted-printable encoding, based on rfc 1521 et al | |
** quoted-printable encoding specifies that non printable characters (anything | |
** below 32 and above 126) be encoded as =XX where XX is the hexadecimal value | |
** of the character. It also specifies some other behavior to enable 8bit data | |
** in a mail message with little difficulty (maximum line sizes, protecting | |
** some cases of whitespace, etc). | |
** | |
** Brandon Long, September 2001. | |
*/ | |
#define PY_SSIZE_T_CLEAN | |
#include "Python.h" | |
#ifdef USE_ZLIB_CRC32 | |
#include "zlib.h" | |
#endif | |
static PyObject *Error; | |
static PyObject *Incomplete; | |
/* | |
** hqx lookup table, ascii->binary. | |
*/ | |
#define RUNCHAR 0x90 | |
#define DONE 0x7F | |
#define SKIP 0x7E | |
#define FAIL 0x7D | |
static unsigned char table_a2b_hqx[256] = { | |
/* ^@ ^A ^B ^C ^D ^E ^F ^G */ | |
/* 0*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
/* \b \t \n ^K ^L \r ^N ^O */ | |
/* 1*/ FAIL, FAIL, SKIP, FAIL, FAIL, SKIP, FAIL, FAIL, | |
/* ^P ^Q ^R ^S ^T ^U ^V ^W */ | |
/* 2*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
/* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */ | |
/* 3*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
/* ! " # $ % & ' */ | |
/* 4*/ FAIL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, | |
/* ( ) * + , - . / */ | |
/* 5*/ 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, FAIL, FAIL, | |
/* 0 1 2 3 4 5 6 7 */ | |
/* 6*/ 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, FAIL, | |
/* 8 9 : ; < = > ? */ | |
/* 7*/ 0x14, 0x15, DONE, FAIL, FAIL, FAIL, FAIL, FAIL, | |
/* @ A B C D E F G */ | |
/* 8*/ 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, | |
/* H I J K L M N O */ | |
/* 9*/ 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, FAIL, | |
/* P Q R S T U V W */ | |
/*10*/ 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, FAIL, | |
/* X Y Z [ \ ] ^ _ */ | |
/*11*/ 0x2C, 0x2D, 0x2E, 0x2F, FAIL, FAIL, FAIL, FAIL, | |
/* ` a b c d e f g */ | |
/*12*/ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, FAIL, | |
/* h i j k l m n o */ | |
/*13*/ 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, FAIL, FAIL, | |
/* p q r s t u v w */ | |
/*14*/ 0x3D, 0x3E, 0x3F, FAIL, FAIL, FAIL, FAIL, FAIL, | |
/* x y z { | } ~ ^? */ | |
/*15*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
/*16*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, | |
}; | |
static unsigned char table_b2a_hqx[] = | |
"!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr"; | |
static char table_a2b_base64[] = { | |
-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,-1,62, -1,-1,-1,63, | |
52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, /* Note PAD->0 */ | |
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, | |
15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, | |
-1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, | |
41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1 | |
}; | |
#define BASE64_PAD '=' | |
/* Max binary chunk size; limited only by available memory */ | |
#define BASE64_MAXBIN (PY_SSIZE_T_MAX/2 - sizeof(PyStringObject) - 3) | |
static unsigned char table_b2a_base64[] = | |
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; | |
static unsigned short crctab_hqx[256] = { | |
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, | |
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, | |
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, | |
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, | |
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, | |
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, | |
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, | |
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, | |
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, | |
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, | |
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, | |
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, | |
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, | |
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, | |
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, | |
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, | |
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, | |
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, | |
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, | |
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, | |
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, | |
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, | |
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, | |
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, | |
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, | |
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, | |
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, | |
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, | |
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, | |
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, | |
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, | |
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0, | |
}; | |
PyDoc_STRVAR(doc_a2b_uu, "(ascii) -> bin. Decode a line of uuencoded data"); | |
static PyObject * | |
binascii_a2b_uu(PyObject *self, PyObject *args) | |
{ | |
Py_buffer pascii; | |
unsigned char *ascii_data, *bin_data; | |
int leftbits = 0; | |
unsigned char this_ch; | |
unsigned int leftchar = 0; | |
PyObject *rv; | |
Py_ssize_t ascii_len, bin_len; | |
if ( !PyArg_ParseTuple(args, "s*:a2b_uu", &pascii) ) | |
return NULL; | |
ascii_data = pascii.buf; | |
ascii_len = pascii.len; | |
assert(ascii_len >= 0); | |
/* First byte: binary data length (in bytes) */ | |
bin_len = (*ascii_data++ - ' ') & 077; | |
ascii_len--; | |
/* Allocate the buffer */ | |
if ( (rv=PyString_FromStringAndSize(NULL, bin_len)) == NULL ) { | |
PyBuffer_Release(&pascii); | |
return NULL; | |
} | |
bin_data = (unsigned char *)PyString_AS_STRING(rv); | |
for( ; bin_len > 0 ; ascii_len--, ascii_data++ ) { | |
/* XXX is it really best to add NULs if there's no more data */ | |
this_ch = (ascii_len > 0) ? *ascii_data : 0; | |
if ( this_ch == '\n' || this_ch == '\r' || ascii_len <= 0) { | |
/* | |
** Whitespace. Assume some spaces got eaten at | |
** end-of-line. (We check this later) | |
*/ | |
this_ch = 0; | |
} else { | |
/* Check the character for legality | |
** The 64 in stead of the expected 63 is because | |
** there are a few uuencodes out there that use | |
** '`' as zero instead of space. | |
*/ | |
if ( this_ch < ' ' || this_ch > (' ' + 64)) { | |
PyErr_SetString(Error, "Illegal char"); | |
PyBuffer_Release(&pascii); | |
Py_DECREF(rv); | |
return NULL; | |
} | |
this_ch = (this_ch - ' ') & 077; | |
} | |
/* | |
** Shift it in on the low end, and see if there's | |
** a byte ready for output. | |
*/ | |
leftchar = (leftchar << 6) | (this_ch); | |
leftbits += 6; | |
if ( leftbits >= 8 ) { | |
leftbits -= 8; | |
*bin_data++ = (leftchar >> leftbits) & 0xff; | |
leftchar &= ((1 << leftbits) - 1); | |
bin_len--; | |
} | |
} | |
/* | |
** Finally, check that if there's anything left on the line | |
** that it's whitespace only. | |
*/ | |
while( ascii_len-- > 0 ) { | |
this_ch = *ascii_data++; | |
/* Extra '`' may be written as padding in some cases */ | |
if ( this_ch != ' ' && this_ch != ' '+64 && | |
this_ch != '\n' && this_ch != '\r' ) { | |
PyErr_SetString(Error, "Trailing garbage"); | |
PyBuffer_Release(&pascii); | |
Py_DECREF(rv); | |
return NULL; | |
} | |
} | |
PyBuffer_Release(&pascii); | |
return rv; | |
} | |
PyDoc_STRVAR(doc_b2a_uu, "(bin) -> ascii. Uuencode line of data"); | |
static PyObject * | |
binascii_b2a_uu(PyObject *self, PyObject *args) | |
{ | |
Py_buffer pbin; | |
unsigned char *ascii_data, *bin_data; | |
int leftbits = 0; | |
unsigned char this_ch; | |
unsigned int leftchar = 0; | |
PyObject *rv; | |
Py_ssize_t bin_len; | |
if ( !PyArg_ParseTuple(args, "s*:b2a_uu", &pbin) ) | |
return NULL; | |
bin_data = pbin.buf; | |
bin_len = pbin.len; | |
if ( bin_len > 45 ) { | |
/* The 45 is a limit that appears in all uuencode's */ | |
PyErr_SetString(Error, "At most 45 bytes at once"); | |
PyBuffer_Release(&pbin); | |
return NULL; | |
} | |
/* We're lazy and allocate to much (fixed up later) */ | |
if ( (rv=PyString_FromStringAndSize(NULL, 2 + (bin_len+2)/3*4)) == NULL ) { | |
PyBuffer_Release(&pbin); | |
return NULL; | |
} | |
ascii_data = (unsigned char *)PyString_AS_STRING(rv); | |
/* Store the length */ | |
*ascii_data++ = ' ' + (bin_len & 077); | |
for( ; bin_len > 0 || leftbits != 0 ; bin_len--, bin_data++ ) { | |
/* Shift the data (or padding) into our buffer */ | |
if ( bin_len > 0 ) /* Data */ | |
leftchar = (leftchar << 8) | *bin_data; | |
else /* Padding */ | |
leftchar <<= 8; | |
leftbits += 8; | |
/* See if there are 6-bit groups ready */ | |
while ( leftbits >= 6 ) { | |
this_ch = (leftchar >> (leftbits-6)) & 0x3f; | |
leftbits -= 6; | |
*ascii_data++ = this_ch + ' '; | |
} | |
} | |
*ascii_data++ = '\n'; /* Append a courtesy newline */ | |
if (_PyString_Resize(&rv, | |
(ascii_data - | |
(unsigned char *)PyString_AS_STRING(rv))) < 0) { | |
Py_DECREF(rv); | |
rv = NULL; | |
} | |
PyBuffer_Release(&pbin); | |
return rv; | |
} | |
static int | |
binascii_find_valid(unsigned char *s, Py_ssize_t slen, int num) | |
{ | |
/* Finds & returns the (num+1)th | |
** valid character for base64, or -1 if none. | |
*/ | |
int ret = -1; | |
unsigned char c, b64val; | |
while ((slen > 0) && (ret == -1)) { | |
c = *s; | |
b64val = table_a2b_base64[c & 0x7f]; | |
if ( ((c <= 0x7f) && (b64val != (unsigned char)-1)) ) { | |
if (num == 0) | |
ret = *s; | |
num--; | |
} | |
s++; | |
slen--; | |
} | |
return ret; | |
} | |
PyDoc_STRVAR(doc_a2b_base64, "(ascii) -> bin. Decode a line of base64 data"); | |
static PyObject * | |
binascii_a2b_base64(PyObject *self, PyObject *args) | |
{ | |
Py_buffer pascii; | |
unsigned char *ascii_data, *bin_data; | |
int leftbits = 0; | |
unsigned char this_ch; | |
unsigned int leftchar = 0; | |
PyObject *rv; | |
Py_ssize_t ascii_len, bin_len; | |
int quad_pos = 0; | |
if ( !PyArg_ParseTuple(args, "s*:a2b_base64", &pascii) ) | |
return NULL; | |
ascii_data = pascii.buf; | |
ascii_len = pascii.len; | |
assert(ascii_len >= 0); | |
if (ascii_len > PY_SSIZE_T_MAX - 3) { | |
PyBuffer_Release(&pascii); | |
return PyErr_NoMemory(); | |
} | |
bin_len = ((ascii_len+3)/4)*3; /* Upper bound, corrected later */ | |
/* Allocate the buffer */ | |
if ( (rv=PyString_FromStringAndSize(NULL, bin_len)) == NULL ) { | |
PyBuffer_Release(&pascii); | |
return NULL; | |
} | |
bin_data = (unsigned char *)PyString_AS_STRING(rv); | |
bin_len = 0; | |
for( ; ascii_len > 0; ascii_len--, ascii_data++) { | |
this_ch = *ascii_data; | |
if (this_ch > 0x7f || | |
this_ch == '\r' || this_ch == '\n' || this_ch == ' ') | |
continue; | |
/* Check for pad sequences and ignore | |
** the invalid ones. | |
*/ | |
if (this_ch == BASE64_PAD) { | |
if ( (quad_pos < 2) || | |
((quad_pos == 2) && | |
(binascii_find_valid(ascii_data, ascii_len, 1) | |
!= BASE64_PAD)) ) | |
{ | |
continue; | |
} | |
else { | |
/* A pad sequence means no more input. | |
** We've already interpreted the data | |
** from the quad at this point. | |
*/ | |
leftbits = 0; | |
break; | |
} | |
} | |
this_ch = table_a2b_base64[*ascii_data]; | |
if ( this_ch == (unsigned char) -1 ) | |
continue; | |
/* | |
** 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) { | |
PyBuffer_Release(&pascii); | |
PyErr_SetString(Error, "Incorrect padding"); | |
Py_DECREF(rv); | |
return NULL; | |
} | |
/* And set string size correctly. If the result string is empty | |
** (because the input was all invalid) return the shared empty | |
** string instead; _PyString_Resize() won't do this for us. | |
*/ | |
if (bin_len > 0) { | |
if (_PyString_Resize(&rv, bin_len) < 0) { | |
Py_DECREF(rv); | |
rv = NULL; | |
} | |
} | |
else { | |
Py_DECREF(rv); | |
rv = PyString_FromStringAndSize("", 0); | |
} | |
PyBuffer_Release(&pascii); | |
return rv; | |
} | |
PyDoc_STRVAR(doc_b2a_base64, "(bin) -> ascii. Base64-code line of data"); | |
static PyObject * | |
binascii_b2a_base64(PyObject *self, PyObject *args) | |
{ | |
Py_buffer pbuf; | |
unsigned char *ascii_data, *bin_data; | |
int leftbits = 0; | |
unsigned char this_ch; | |
unsigned int leftchar = 0; | |
PyObject *rv; | |
Py_ssize_t bin_len; | |
if ( !PyArg_ParseTuple(args, "s*:b2a_base64", &pbuf) ) | |
return NULL; | |
bin_data = pbuf.buf; | |
bin_len = pbuf.len; | |
assert(bin_len >= 0); | |
if ( bin_len > BASE64_MAXBIN ) { | |
PyErr_SetString(Error, "Too much data for base64 line"); | |
PyBuffer_Release(&pbuf); | |
return NULL; | |
} | |
/* We're lazy and allocate too much (fixed up later). | |
"+3" leaves room for up to two pad characters and a trailing | |
newline. Note that 'b' gets encoded as 'Yg==\n' (1 in, 5 out). */ | |
if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2 + 3)) == NULL ) { | |
PyBuffer_Release(&pbuf); | |
return NULL; | |
} | |
ascii_data = (unsigned char *)PyString_AS_STRING(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 */ | |
if (_PyString_Resize(&rv, | |
(ascii_data - | |
(unsigned char *)PyString_AS_STRING(rv))) < 0) { | |
Py_DECREF(rv); | |
rv = NULL; | |
} | |
PyBuffer_Release(&pbuf); | |
return rv; | |
} | |
PyDoc_STRVAR(doc_a2b_hqx, "ascii -> bin, done. Decode .hqx coding"); | |
static PyObject * | |
binascii_a2b_hqx(PyObject *self, PyObject *args) | |
{ | |
Py_buffer pascii; | |
unsigned char *ascii_data, *bin_data; | |
int leftbits = 0; | |
unsigned char this_ch; | |
unsigned int leftchar = 0; | |
PyObject *rv; | |
Py_ssize_t len; | |
int done = 0; | |
if ( !PyArg_ParseTuple(args, "s*:a2b_hqx", &pascii) ) | |
return NULL; | |
ascii_data = pascii.buf; | |
len = pascii.len; | |
assert(len >= 0); | |
if (len > PY_SSIZE_T_MAX - 2) { | |
PyBuffer_Release(&pascii); | |
return PyErr_NoMemory(); | |
} | |
/* Allocate a string that is too big (fixed later) | |
Add two to the initial length to prevent interning which | |
would preclude subsequent resizing. */ | |
if ( (rv=PyString_FromStringAndSize(NULL, len+2)) == NULL ) { | |
PyBuffer_Release(&pascii); | |
return NULL; | |
} | |
bin_data = (unsigned char *)PyString_AS_STRING(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"); | |
PyBuffer_Release(&pascii); | |
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"); | |
PyBuffer_Release(&pascii); | |
Py_DECREF(rv); | |
return NULL; | |
} | |
if (_PyString_Resize(&rv, | |
(bin_data - | |
(unsigned char *)PyString_AS_STRING(rv))) < 0) { | |
Py_DECREF(rv); | |
rv = NULL; | |
} | |
if (rv) { | |
PyObject *rrv = Py_BuildValue("Oi", rv, done); | |
PyBuffer_Release(&pascii); | |
Py_DECREF(rv); | |
return rrv; | |
} | |
PyBuffer_Release(&pascii); | |
return NULL; | |
} | |
PyDoc_STRVAR(doc_rlecode_hqx, "Binhex RLE-code binary data"); | |
static PyObject * | |
binascii_rlecode_hqx(PyObject *self, PyObject *args) | |
{ | |
Py_buffer pbuf; | |
unsigned char *in_data, *out_data; | |
PyObject *rv; | |
unsigned char ch; | |
Py_ssize_t in, inend, len; | |
if ( !PyArg_ParseTuple(args, "s*:rlecode_hqx", &pbuf) ) | |
return NULL; | |
in_data = pbuf.buf; | |
len = pbuf.len; | |
assert(len >= 0); | |
if (len > PY_SSIZE_T_MAX / 2 - 2) { | |
PyBuffer_Release(&pbuf); | |
return PyErr_NoMemory(); | |
} | |
/* Worst case: output is twice as big as input (fixed later) */ | |
if ( (rv=PyString_FromStringAndSize(NULL, len*2+2)) == NULL ) { | |
PyBuffer_Release(&pbuf); | |
return NULL; | |
} | |
out_data = (unsigned char *)PyString_AS_STRING(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; | |
} | |
} | |
} | |
if (_PyString_Resize(&rv, | |
(out_data - | |
(unsigned char *)PyString_AS_STRING(rv))) < 0) { | |
Py_DECREF(rv); | |
rv = NULL; | |
} | |
PyBuffer_Release(&pbuf); | |
return rv; | |
} | |
PyDoc_STRVAR(doc_b2a_hqx, "Encode .hqx data"); | |
static PyObject * | |
binascii_b2a_hqx(PyObject *self, PyObject *args) | |
{ | |
Py_buffer pbin; | |
unsigned char *ascii_data, *bin_data; | |
int leftbits = 0; | |
unsigned char this_ch; | |
unsigned int leftchar = 0; | |
PyObject *rv; | |
Py_ssize_t len; | |
if ( !PyArg_ParseTuple(args, "s*:b2a_hqx", &pbin) ) | |
return NULL; | |
bin_data = pbin.buf; | |
len = pbin.len; | |
assert(len >= 0); | |
if (len > PY_SSIZE_T_MAX / 2 - 2) { | |
PyBuffer_Release(&pbin); | |
return PyErr_NoMemory(); | |
} | |
/* Allocate a buffer that is at least large enough */ | |
if ( (rv=PyString_FromStringAndSize(NULL, len*2+2)) == NULL ) { | |
PyBuffer_Release(&pbin); | |
return NULL; | |
} | |
ascii_data = (unsigned char *)PyString_AS_STRING(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]; | |
} | |
if (_PyString_Resize(&rv, | |
(ascii_data - | |
(unsigned char *)PyString_AS_STRING(rv))) < 0) { | |
Py_DECREF(rv); | |
rv = NULL; | |
} | |
PyBuffer_Release(&pbin); | |
return rv; | |
} | |
PyDoc_STRVAR(doc_rledecode_hqx, "Decode hexbin RLE-coded string"); | |
static PyObject * | |
binascii_rledecode_hqx(PyObject *self, PyObject *args) | |
{ | |
Py_buffer pin; | |
unsigned char *in_data, *out_data; | |
unsigned char in_byte, in_repeat; | |
PyObject *rv; | |
Py_ssize_t in_len, out_len, out_len_left; | |
if ( !PyArg_ParseTuple(args, "s*:rledecode_hqx", &pin) ) | |
return NULL; | |
in_data = pin.buf; | |
in_len = pin.len; | |
assert(in_len >= 0); | |
/* Empty string is a special case */ | |
if ( in_len == 0 ) { | |
PyBuffer_Release(&pin); | |
return PyString_FromStringAndSize("", 0); | |
} | |
else if (in_len > PY_SSIZE_T_MAX / 2) { | |
PyBuffer_Release(&pin); | |
return PyErr_NoMemory(); | |
} | |
/* Allocate a buffer of reasonable size. Resized when needed */ | |
out_len = in_len*2; | |
if ( (rv=PyString_FromStringAndSize(NULL, out_len)) == NULL ) { | |
PyBuffer_Release(&pin); | |
return NULL; | |
} | |
out_len_left = out_len; | |
out_data = (unsigned char *)PyString_AS_STRING(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); \ | |
PyBuffer_Release(&pin); \ | |
return NULL; \ | |
} \ | |
b = *in_data++; \ | |
} while(0) | |
#define OUTBYTE(b) \ | |
do { \ | |
if ( --out_len_left < 0 ) { \ | |
if ( out_len > PY_SSIZE_T_MAX / 2) return PyErr_NoMemory(); \ | |
if (_PyString_Resize(&rv, 2*out_len) < 0) \ | |
{ Py_DECREF(rv); PyBuffer_Release(&pin); return NULL; } \ | |
out_data = (unsigned char *)PyString_AS_STRING(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"); | |
PyBuffer_Release(&pin); | |
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); | |
} | |
} | |
if (_PyString_Resize(&rv, | |
(out_data - | |
(unsigned char *)PyString_AS_STRING(rv))) < 0) { | |
Py_DECREF(rv); | |
rv = NULL; | |
} | |
PyBuffer_Release(&pin); | |
return rv; | |
} | |
PyDoc_STRVAR(doc_crc_hqx, | |
"(data, oldcrc) -> newcrc. Compute hqx CRC incrementally"); | |
static PyObject * | |
binascii_crc_hqx(PyObject *self, PyObject *args) | |
{ | |
Py_buffer pin; | |
unsigned char *bin_data; | |
unsigned int crc; | |
Py_ssize_t len; | |
if ( !PyArg_ParseTuple(args, "s*i:crc_hqx", &pin, &crc) ) | |
return NULL; | |
bin_data = pin.buf; | |
len = pin.len; | |
while(len-- > 0) { | |
crc=((crc<<8)&0xff00)^crctab_hqx[((crc>>8)&0xff)^*bin_data++]; | |
} | |
PyBuffer_Release(&pin); | |
return Py_BuildValue("i", crc); | |
} | |
PyDoc_STRVAR(doc_crc32, | |
"(data, oldcrc = 0) -> newcrc. Compute CRC-32 incrementally"); | |
#ifdef USE_ZLIB_CRC32 | |
/* This was taken from zlibmodule.c PyZlib_crc32 (but is PY_SSIZE_T_CLEAN) */ | |
static PyObject * | |
binascii_crc32(PyObject *self, PyObject *args) | |
{ | |
unsigned int crc32val = 0; /* crc32(0L, Z_NULL, 0) */ | |
Py_buffer pbuf; | |
Byte *buf; | |
Py_ssize_t len; | |
int signed_val; | |
if (!PyArg_ParseTuple(args, "s*|I:crc32", &pbuf, &crc32val)) | |
return NULL; | |
/* In Python 2.x we return a signed integer regardless of native platform | |
* long size (the 32bit unsigned long is treated as 32-bit signed and sign | |
* extended into a 64-bit long inside the integer object). 3.0 does the | |
* right thing and returns unsigned. http://bugs.python.org/issue1202 */ | |
buf = (Byte*)pbuf.buf; | |
len = pbuf.len; | |
signed_val = crc32(crc32val, buf, len); | |
PyBuffer_Release(&pbuf); | |
return PyInt_FromLong(signed_val); | |
} | |
#else /* USE_ZLIB_CRC32 */ | |
/* 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 int crc_32_tab[256] = { | |
0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU, 0x076dc419U, | |
0x706af48fU, 0xe963a535U, 0x9e6495a3U, 0x0edb8832U, 0x79dcb8a4U, | |
0xe0d5e91eU, 0x97d2d988U, 0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U, | |
0x90bf1d91U, 0x1db71064U, 0x6ab020f2U, 0xf3b97148U, 0x84be41deU, | |
0x1adad47dU, 0x6ddde4ebU, 0xf4d4b551U, 0x83d385c7U, 0x136c9856U, | |
0x646ba8c0U, 0xfd62f97aU, 0x8a65c9ecU, 0x14015c4fU, 0x63066cd9U, | |
0xfa0f3d63U, 0x8d080df5U, 0x3b6e20c8U, 0x4c69105eU, 0xd56041e4U, | |
0xa2677172U, 0x3c03e4d1U, 0x4b04d447U, 0xd20d85fdU, 0xa50ab56bU, | |
0x35b5a8faU, 0x42b2986cU, 0xdbbbc9d6U, 0xacbcf940U, 0x32d86ce3U, | |
0x45df5c75U, 0xdcd60dcfU, 0xabd13d59U, 0x26d930acU, 0x51de003aU, | |
0xc8d75180U, 0xbfd06116U, 0x21b4f4b5U, 0x56b3c423U, 0xcfba9599U, | |
0xb8bda50fU, 0x2802b89eU, 0x5f058808U, 0xc60cd9b2U, 0xb10be924U, | |
0x2f6f7c87U, 0x58684c11U, 0xc1611dabU, 0xb6662d3dU, 0x76dc4190U, | |
0x01db7106U, 0x98d220bcU, 0xefd5102aU, 0x71b18589U, 0x06b6b51fU, | |
0x9fbfe4a5U, 0xe8b8d433U, 0x7807c9a2U, 0x0f00f934U, 0x9609a88eU, | |
0xe10e9818U, 0x7f6a0dbbU, 0x086d3d2dU, 0x91646c97U, 0xe6635c01U, | |
0x6b6b51f4U, 0x1c6c6162U, 0x856530d8U, 0xf262004eU, 0x6c0695edU, | |
0x1b01a57bU, 0x8208f4c1U, 0xf50fc457U, 0x65b0d9c6U, 0x12b7e950U, | |
0x8bbeb8eaU, 0xfcb9887cU, 0x62dd1ddfU, 0x15da2d49U, 0x8cd37cf3U, | |
0xfbd44c65U, 0x4db26158U, 0x3ab551ceU, 0xa3bc0074U, 0xd4bb30e2U, | |
0x4adfa541U, 0x3dd895d7U, 0xa4d1c46dU, 0xd3d6f4fbU, 0x4369e96aU, | |
0x346ed9fcU, 0xad678846U, 0xda60b8d0U, 0x44042d73U, 0x33031de5U, | |
0xaa0a4c5fU, 0xdd0d7cc9U, 0x5005713cU, 0x270241aaU, 0xbe0b1010U, | |
0xc90c2086U, 0x5768b525U, 0x206f85b3U, 0xb966d409U, 0xce61e49fU, | |
0x5edef90eU, 0x29d9c998U, 0xb0d09822U, 0xc7d7a8b4U, 0x59b33d17U, | |
0x2eb40d81U, 0xb7bd5c3bU, 0xc0ba6cadU, 0xedb88320U, 0x9abfb3b6U, | |
0x03b6e20cU, 0x74b1d29aU, 0xead54739U, 0x9dd277afU, 0x04db2615U, | |
0x73dc1683U, 0xe3630b12U, 0x94643b84U, 0x0d6d6a3eU, 0x7a6a5aa8U, | |
0xe40ecf0bU, 0x9309ff9dU, 0x0a00ae27U, 0x7d079eb1U, 0xf00f9344U, | |
0x8708a3d2U, 0x1e01f268U, 0x6906c2feU, 0xf762575dU, 0x806567cbU, | |
0x196c3671U, 0x6e6b06e7U, 0xfed41b76U, 0x89d32be0U, 0x10da7a5aU, | |
0x67dd4accU, 0xf9b9df6fU, 0x8ebeeff9U, 0x17b7be43U, 0x60b08ed5U, | |
0xd6d6a3e8U, 0xa1d1937eU, 0x38d8c2c4U, 0x4fdff252U, 0xd1bb67f1U, | |
0xa6bc5767U, 0x3fb506ddU, 0x48b2364bU, 0xd80d2bdaU, 0xaf0a1b4cU, | |
0x36034af6U, 0x41047a60U, 0xdf60efc3U, 0xa867df55U, 0x316e8eefU, | |
0x4669be79U, 0xcb61b38cU, 0xbc66831aU, 0x256fd2a0U, 0x5268e236U, | |
0xcc0c7795U, 0xbb0b4703U, 0x220216b9U, 0x5505262fU, 0xc5ba3bbeU, | |
0xb2bd0b28U, 0x2bb45a92U, 0x5cb36a04U, 0xc2d7ffa7U, 0xb5d0cf31U, | |
0x2cd99e8bU, 0x5bdeae1dU, 0x9b64c2b0U, 0xec63f226U, 0x756aa39cU, | |
0x026d930aU, 0x9c0906a9U, 0xeb0e363fU, 0x72076785U, 0x05005713U, | |
0x95bf4a82U, 0xe2b87a14U, 0x7bb12baeU, 0x0cb61b38U, 0x92d28e9bU, | |
0xe5d5be0dU, 0x7cdcefb7U, 0x0bdbdf21U, 0x86d3d2d4U, 0xf1d4e242U, | |
0x68ddb3f8U, 0x1fda836eU, 0x81be16cdU, 0xf6b9265bU, 0x6fb077e1U, | |
0x18b74777U, 0x88085ae6U, 0xff0f6a70U, 0x66063bcaU, 0x11010b5cU, | |
0x8f659effU, 0xf862ae69U, 0x616bffd3U, 0x166ccf45U, 0xa00ae278U, | |
0xd70dd2eeU, 0x4e048354U, 0x3903b3c2U, 0xa7672661U, 0xd06016f7U, | |
0x4969474dU, 0x3e6e77dbU, 0xaed16a4aU, 0xd9d65adcU, 0x40df0b66U, | |
0x37d83bf0U, 0xa9bcae53U, 0xdebb9ec5U, 0x47b2cf7fU, 0x30b5ffe9U, | |
0xbdbdf21cU, 0xcabac28aU, 0x53b39330U, 0x24b4a3a6U, 0xbad03605U, | |
0xcdd70693U, 0x54de5729U, 0x23d967bfU, 0xb3667a2eU, 0xc4614ab8U, | |
0x5d681b02U, 0x2a6f2b94U, 0xb40bbe37U, 0xc30c8ea1U, 0x5a05df1bU, | |
0x2d02ef8dU | |
}; | |
static PyObject * | |
binascii_crc32(PyObject *self, PyObject *args) | |
{ /* By Jim Ahlstrom; All rights transferred to CNRI */ | |
Py_buffer pbin; | |
unsigned char *bin_data; | |
unsigned int crc = 0U; /* initial value of CRC */ | |
Py_ssize_t len; | |
int result; | |
if ( !PyArg_ParseTuple(args, "s*|I:crc32", &pbin, &crc) ) | |
return NULL; | |
bin_data = pbin.buf; | |
len = pbin.len; | |
crc = ~ crc; | |
while (len-- > 0) | |
crc = crc_32_tab[(crc ^ *bin_data++) & 0xffU] ^ (crc >> 8); | |
/* Note: (crc >> 8) MUST zero fill on left */ | |
result = (int)(crc ^ 0xFFFFFFFFU); | |
PyBuffer_Release(&pbin); | |
return PyInt_FromLong(result); | |
} | |
#endif /* USE_ZLIB_CRC32 */ | |
static PyObject * | |
binascii_hexlify(PyObject *self, PyObject *args) | |
{ | |
Py_buffer parg; | |
char* argbuf; | |
Py_ssize_t arglen; | |
PyObject *retval; | |
char* retbuf; | |
Py_ssize_t i, j; | |
if (!PyArg_ParseTuple(args, "s*:b2a_hex", &parg)) | |
return NULL; | |
argbuf = parg.buf; | |
arglen = parg.len; | |
assert(arglen >= 0); | |
if (arglen > PY_SSIZE_T_MAX / 2) { | |
PyBuffer_Release(&parg); | |
return PyErr_NoMemory(); | |
} | |
retval = PyString_FromStringAndSize(NULL, arglen*2); | |
if (!retval) { | |
PyBuffer_Release(&parg); | |
return NULL; | |
} | |
retbuf = PyString_AS_STRING(retval); | |
/* 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; | |
} | |
PyBuffer_Release(&parg); | |
return retval; | |
} | |
PyDoc_STRVAR(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) | |
{ | |
Py_buffer parg; | |
char* argbuf; | |
Py_ssize_t arglen; | |
PyObject *retval; | |
char* retbuf; | |
Py_ssize_t i, j; | |
if (!PyArg_ParseTuple(args, "s*:a2b_hex", &parg)) | |
return NULL; | |
argbuf = parg.buf; | |
arglen = parg.len; | |
assert(arglen >= 0); | |
/* 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) { | |
PyBuffer_Release(&parg); | |
PyErr_SetString(PyExc_TypeError, "Odd-length string"); | |
return NULL; | |
} | |
retval = PyString_FromStringAndSize(NULL, (arglen/2)); | |
if (!retval) { | |
PyBuffer_Release(&parg); | |
return NULL; | |
} | |
retbuf = PyString_AS_STRING(retval); | |
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; | |
} | |
PyBuffer_Release(&parg); | |
return retval; | |
finally: | |
PyBuffer_Release(&parg); | |
Py_DECREF(retval); | |
return NULL; | |
} | |
PyDoc_STRVAR(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 | |
PyDoc_STRVAR(doc_a2b_qp, "Decode a string of qp-encoded data"); | |
static PyObject* | |
binascii_a2b_qp(PyObject *self, PyObject *args, PyObject *kwargs) | |
{ | |
Py_ssize_t in, out; | |
char ch; | |
Py_buffer pdata; | |
unsigned char *data, *odata; | |
Py_ssize_t datalen = 0; | |
PyObject *rv; | |
static char *kwlist[] = {"data", "header", NULL}; | |
int header = 0; | |
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*|i", kwlist, &pdata, | |
&header)) | |
return NULL; | |
data = pdata.buf; | |
datalen = pdata.len; | |
/* We allocate the output same size as input, this is overkill. | |
* The previous implementation used calloc() so we'll zero out the | |
* memory here too, since PyMem_Malloc() does not guarantee that. | |
*/ | |
odata = (unsigned char *) PyMem_Malloc(datalen); | |
if (odata == NULL) { | |
PyBuffer_Release(&pdata); | |
PyErr_NoMemory(); | |
return NULL; | |
} | |
memset(odata, 0, datalen); | |
in = out = 0; | |
while (in < datalen) { | |
if (data[in] == '=') { | |
in++; | |
if (in >= datalen) break; | |
/* Soft line breaks */ | |
if ((data[in] == '\n') || (data[in] == '\r')) { | |
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) { | |
PyBuffer_Release(&pdata); | |
PyMem_Free(odata); | |
return NULL; | |
} | |
PyBuffer_Release(&pdata); | |
PyMem_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; | |
} | |
PyDoc_STRVAR(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) | |
{ | |
Py_ssize_t in, out; | |
Py_buffer pdata; | |
unsigned char *data, *odata; | |
Py_ssize_t 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, &pdata, | |
"etabs, &istext, &header)) | |
return NULL; | |
data = pdata.buf; | |
datalen = pdata.len; | |
/* 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 *) memchr(data, '\n', datalen); | |
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 == 0) && | |
(data[in+1] == '\n' || data[in+1] == '\r' || data[in+1] == 0)) || | |
(!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 || | |
(!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++; | |
} | |
} | |
} | |
/* We allocate the output same size as input, this is overkill. | |
* The previous implementation used calloc() so we'll zero out the | |
* memory here too, since PyMem_Malloc() does not guarantee that. | |
*/ | |
odata = (unsigned char *) PyMem_Malloc(odatalen); | |
if (odata == NULL) { | |
PyBuffer_Release(&pdata); | |
PyErr_NoMemory(); | |
return NULL; | |
} | |
memset(odata, 0, odatalen); | |
in = out = linelen = 0; | |
while (in < datalen) { | |
if ((data[in] > 126) || | |
(data[in] == '=') || | |
(header && data[in] == '_') || | |
((data[in] == '.') && (linelen == 0) && | |
(data[in+1] == '\n' || data[in+1] == '\r' || data[in+1] == 0)) || | |
(!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 || | |
(!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) { | |
PyBuffer_Release(&pdata); | |
PyMem_Free(odata); | |
return NULL; | |
} | |
PyBuffer_Release(&pdata); | |
PyMem_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) */ | |
PyDoc_STRVAR(doc_binascii, "Conversion between binary data and ASCII"); | |
PyMODINIT_FUNC | |
initbinascii(void) | |
{ | |
PyObject *m, *d, *x; | |
/* Create the module and add the functions */ | |
m = Py_InitModule("binascii", binascii_module_methods); | |
if (m == NULL) | |
return; | |
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); | |
} |