Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 1 | /* |
| 2 | ** Routines to represent binary data in ASCII and vice-versa |
| 3 | ** |
| 4 | ** This module currently supports the following encodings: |
| 5 | ** uuencode: |
| 6 | ** each line encodes 45 bytes (except possibly the last) |
| 7 | ** First char encodes (binary) length, rest data |
| 8 | ** each char encodes 6 bits, as follows: |
| 9 | ** binary: 01234567 abcdefgh ijklmnop |
| 10 | ** ascii: 012345 67abcd efghij klmnop |
| 11 | ** ASCII encoding method is "excess-space": 000000 is encoded as ' ', etc. |
| 12 | ** short binary data is zero-extended (so the bits are always in the |
| 13 | ** right place), this does *not* reflect in the length. |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 14 | ** base64: |
| 15 | ** Line breaks are insignificant, but lines are at most 76 chars |
| 16 | ** each char encodes 6 bits, in similar order as uucode/hqx. Encoding |
| 17 | ** is done via a table. |
| 18 | ** Short binary data is filled (in ASCII) with '='. |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 19 | ** hqx: |
| 20 | ** File starts with introductory text, real data starts and ends |
| 21 | ** with colons. |
| 22 | ** Data consists of three similar parts: info, datafork, resourcefork. |
| 23 | ** Each part is protected (at the end) with a 16-bit crc |
| 24 | ** The binary data is run-length encoded, and then ascii-fied: |
| 25 | ** binary: 01234567 abcdefgh ijklmnop |
| 26 | ** ascii: 012345 67abcd efghij klmnop |
| 27 | ** ASCII encoding is table-driven, see the code. |
| 28 | ** Short binary data results in the runt ascii-byte being output with |
| 29 | ** the bits in the right place. |
| 30 | ** |
| 31 | ** While I was reading dozens of programs that encode or decode the formats |
| 32 | ** here (documentation? hihi:-) I have formulated Jansen's Observation: |
| 33 | ** |
| 34 | ** Programs that encode binary data in ASCII are written in |
| 35 | ** such a style that they are as unreadable as possible. Devices used |
| 36 | ** include unnecessary global variables, burying important tables |
| 37 | ** in unrelated sourcefiles, putting functions in include files, |
| 38 | ** using seemingly-descriptive variable names for different purposes, |
| 39 | ** calls to empty subroutines and a host of others. |
| 40 | ** |
| 41 | ** I have attempted to break with this tradition, but I guess that that |
| 42 | ** does make the performance sub-optimal. Oh well, too bad... |
| 43 | ** |
| 44 | ** Jack Jansen, CWI, July 1995. |
Martin v. Löwis | 16dc7f4 | 2001-09-30 20:32:11 +0000 | [diff] [blame] | 45 | ** |
| 46 | ** Added support for quoted-printable encoding, based on rfc 1521 et al |
| 47 | ** quoted-printable encoding specifies that non printable characters (anything |
| 48 | ** below 32 and above 126) be encoded as =XX where XX is the hexadecimal value |
| 49 | ** of the character. It also specifies some other behavior to enable 8bit data |
| 50 | ** in a mail message with little difficulty (maximum line sizes, protecting |
| 51 | ** some cases of whitespace, etc). |
| 52 | ** |
| 53 | ** Brandon Long, September 2001. |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 54 | */ |
| 55 | |
| 56 | |
| 57 | #include "Python.h" |
| 58 | |
| 59 | static PyObject *Error; |
| 60 | static PyObject *Incomplete; |
| 61 | |
| 62 | /* |
| 63 | ** hqx lookup table, ascii->binary. |
| 64 | */ |
| 65 | |
| 66 | #define RUNCHAR 0x90 |
| 67 | |
| 68 | #define DONE 0x7F |
| 69 | #define SKIP 0x7E |
| 70 | #define FAIL 0x7D |
| 71 | |
| 72 | static unsigned char table_a2b_hqx[256] = { |
| 73 | /* ^@ ^A ^B ^C ^D ^E ^F ^G */ |
| 74 | /* 0*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 75 | /* \b \t \n ^K ^L \r ^N ^O */ |
| 76 | /* 1*/ FAIL, FAIL, SKIP, FAIL, FAIL, SKIP, FAIL, FAIL, |
| 77 | /* ^P ^Q ^R ^S ^T ^U ^V ^W */ |
| 78 | /* 2*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 79 | /* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */ |
| 80 | /* 3*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 81 | /* ! " # $ % & ' */ |
| 82 | /* 4*/ FAIL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, |
| 83 | /* ( ) * + , - . / */ |
| 84 | /* 5*/ 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, FAIL, FAIL, |
| 85 | /* 0 1 2 3 4 5 6 7 */ |
| 86 | /* 6*/ 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, FAIL, |
| 87 | /* 8 9 : ; < = > ? */ |
| 88 | /* 7*/ 0x14, 0x15, DONE, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 89 | /* @ A B C D E F G */ |
| 90 | /* 8*/ 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, |
| 91 | /* H I J K L M N O */ |
| 92 | /* 9*/ 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, FAIL, |
| 93 | /* P Q R S T U V W */ |
| 94 | /*10*/ 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, FAIL, |
| 95 | /* X Y Z [ \ ] ^ _ */ |
| 96 | /*11*/ 0x2C, 0x2D, 0x2E, 0x2F, FAIL, FAIL, FAIL, FAIL, |
| 97 | /* ` a b c d e f g */ |
| 98 | /*12*/ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, FAIL, |
| 99 | /* h i j k l m n o */ |
| 100 | /*13*/ 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, FAIL, FAIL, |
| 101 | /* p q r s t u v w */ |
| 102 | /*14*/ 0x3D, 0x3E, 0x3F, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 103 | /* x y z { | } ~ ^? */ |
| 104 | /*15*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 105 | /*16*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 106 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 107 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 108 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 109 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 110 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 111 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 112 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 113 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 114 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 115 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 116 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 117 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 118 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 119 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 120 | FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, |
| 121 | }; |
| 122 | |
| 123 | static unsigned char table_b2a_hqx[] = |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 124 | "!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr"; |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 125 | |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 126 | static char table_a2b_base64[] = { |
| 127 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| 128 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| 129 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63, |
| 130 | 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, /* Note PAD->0 */ |
| 131 | -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, |
| 132 | 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, |
| 133 | -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, |
| 134 | 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1 |
| 135 | }; |
| 136 | |
| 137 | #define BASE64_PAD '=' |
| 138 | #define BASE64_MAXBIN 57 /* Max binary chunk size (76 char line) */ |
| 139 | |
| 140 | static unsigned char table_b2a_base64[] = |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 141 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 142 | |
| 143 | |
| 144 | |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 145 | static unsigned short crctab_hqx[256] = { |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 146 | 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, |
| 147 | 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, |
| 148 | 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, |
| 149 | 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, |
| 150 | 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, |
| 151 | 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, |
| 152 | 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, |
| 153 | 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, |
| 154 | 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, |
| 155 | 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, |
| 156 | 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, |
| 157 | 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, |
| 158 | 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, |
| 159 | 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, |
| 160 | 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, |
| 161 | 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, |
| 162 | 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, |
| 163 | 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, |
| 164 | 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, |
| 165 | 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, |
| 166 | 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, |
| 167 | 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, |
| 168 | 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, |
| 169 | 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, |
| 170 | 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, |
| 171 | 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, |
| 172 | 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, |
| 173 | 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, |
| 174 | 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, |
| 175 | 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, |
| 176 | 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, |
| 177 | 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0, |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 178 | }; |
| 179 | |
| 180 | static char doc_a2b_uu[] = "(ascii) -> bin. Decode a line of uuencoded data"; |
| 181 | |
| 182 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 183 | binascii_a2b_uu(PyObject *self, PyObject *args) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 184 | { |
| 185 | unsigned char *ascii_data, *bin_data; |
| 186 | int leftbits = 0; |
| 187 | unsigned char this_ch; |
| 188 | unsigned int leftchar = 0; |
| 189 | PyObject *rv; |
| 190 | int ascii_len, bin_len; |
| 191 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 192 | if ( !PyArg_ParseTuple(args, "t#:a2b_uu", &ascii_data, &ascii_len) ) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 193 | return NULL; |
| 194 | |
| 195 | /* First byte: binary data length (in bytes) */ |
| 196 | bin_len = (*ascii_data++ - ' ') & 077; |
| 197 | ascii_len--; |
| 198 | |
| 199 | /* Allocate the buffer */ |
| 200 | if ( (rv=PyString_FromStringAndSize(NULL, bin_len)) == NULL ) |
| 201 | return NULL; |
| 202 | bin_data = (unsigned char *)PyString_AsString(rv); |
| 203 | |
| 204 | for( ; bin_len > 0 ; ascii_len--, ascii_data++ ) { |
| 205 | this_ch = *ascii_data; |
| 206 | if ( this_ch == '\n' || this_ch == '\r' || ascii_len <= 0) { |
| 207 | /* |
| 208 | ** Whitespace. Assume some spaces got eaten at |
| 209 | ** end-of-line. (We check this later) |
| 210 | */ |
| 211 | this_ch = 0; |
| 212 | } else { |
Jack Jansen | 5d95797 | 1995-11-14 10:35:19 +0000 | [diff] [blame] | 213 | /* Check the character for legality |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 214 | ** The 64 in stead of the expected 63 is because |
| 215 | ** there are a few uuencodes out there that use |
Guido van Rossum | 92d8917 | 2001-01-09 02:11:57 +0000 | [diff] [blame] | 216 | ** '`' as zero instead of space. |
Jack Jansen | 5d95797 | 1995-11-14 10:35:19 +0000 | [diff] [blame] | 217 | */ |
| 218 | if ( this_ch < ' ' || this_ch > (' ' + 64)) { |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 219 | PyErr_SetString(Error, "Illegal char"); |
| 220 | Py_DECREF(rv); |
| 221 | return NULL; |
| 222 | } |
| 223 | this_ch = (this_ch - ' ') & 077; |
| 224 | } |
| 225 | /* |
| 226 | ** Shift it in on the low end, and see if there's |
| 227 | ** a byte ready for output. |
| 228 | */ |
| 229 | leftchar = (leftchar << 6) | (this_ch); |
| 230 | leftbits += 6; |
| 231 | if ( leftbits >= 8 ) { |
| 232 | leftbits -= 8; |
| 233 | *bin_data++ = (leftchar >> leftbits) & 0xff; |
| 234 | leftchar &= ((1 << leftbits) - 1); |
| 235 | bin_len--; |
| 236 | } |
| 237 | } |
| 238 | /* |
| 239 | ** Finally, check that if there's anything left on the line |
| 240 | ** that it's whitespace only. |
| 241 | */ |
| 242 | while( ascii_len-- > 0 ) { |
| 243 | this_ch = *ascii_data++; |
Guido van Rossum | 92d8917 | 2001-01-09 02:11:57 +0000 | [diff] [blame] | 244 | /* Extra '`' may be written as padding in some cases */ |
| 245 | if ( this_ch != ' ' && this_ch != ' '+64 && |
Guido van Rossum | 1243ae7 | 1997-07-11 18:36:28 +0000 | [diff] [blame] | 246 | this_ch != '\n' && this_ch != '\r' ) { |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 247 | PyErr_SetString(Error, "Trailing garbage"); |
| 248 | Py_DECREF(rv); |
| 249 | return NULL; |
| 250 | } |
| 251 | } |
| 252 | return rv; |
| 253 | } |
| 254 | |
| 255 | static char doc_b2a_uu[] = "(bin) -> ascii. Uuencode line of data"; |
| 256 | |
| 257 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 258 | binascii_b2a_uu(PyObject *self, PyObject *args) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 259 | { |
| 260 | unsigned char *ascii_data, *bin_data; |
| 261 | int leftbits = 0; |
| 262 | unsigned char this_ch; |
| 263 | unsigned int leftchar = 0; |
| 264 | PyObject *rv; |
| 265 | int bin_len; |
| 266 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 267 | if ( !PyArg_ParseTuple(args, "s#:b2a_uu", &bin_data, &bin_len) ) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 268 | return NULL; |
| 269 | if ( bin_len > 45 ) { |
| 270 | /* The 45 is a limit that appears in all uuencode's */ |
| 271 | PyErr_SetString(Error, "At most 45 bytes at once"); |
| 272 | return NULL; |
| 273 | } |
| 274 | |
| 275 | /* We're lazy and allocate to much (fixed up later) */ |
| 276 | if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2)) == NULL ) |
| 277 | return NULL; |
| 278 | ascii_data = (unsigned char *)PyString_AsString(rv); |
| 279 | |
| 280 | /* Store the length */ |
| 281 | *ascii_data++ = ' ' + (bin_len & 077); |
| 282 | |
| 283 | for( ; bin_len > 0 || leftbits != 0 ; bin_len--, bin_data++ ) { |
| 284 | /* Shift the data (or padding) into our buffer */ |
| 285 | if ( bin_len > 0 ) /* Data */ |
| 286 | leftchar = (leftchar << 8) | *bin_data; |
| 287 | else /* Padding */ |
| 288 | leftchar <<= 8; |
| 289 | leftbits += 8; |
| 290 | |
| 291 | /* See if there are 6-bit groups ready */ |
| 292 | while ( leftbits >= 6 ) { |
| 293 | this_ch = (leftchar >> (leftbits-6)) & 0x3f; |
| 294 | leftbits -= 6; |
| 295 | *ascii_data++ = this_ch + ' '; |
| 296 | } |
| 297 | } |
| 298 | *ascii_data++ = '\n'; /* Append a courtesy newline */ |
| 299 | |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 300 | _PyString_Resize(&rv, (ascii_data - |
| 301 | (unsigned char *)PyString_AsString(rv))); |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 302 | return rv; |
| 303 | } |
| 304 | |
Guido van Rossum | 2db4f47 | 1999-10-19 19:05:14 +0000 | [diff] [blame] | 305 | |
| 306 | static int |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 307 | binascii_find_valid(unsigned char *s, int slen, int num) |
Guido van Rossum | 2db4f47 | 1999-10-19 19:05:14 +0000 | [diff] [blame] | 308 | { |
| 309 | /* Finds & returns the (num+1)th |
| 310 | ** valid character for base64, or -1 if none. |
| 311 | */ |
| 312 | |
| 313 | int ret = -1; |
| 314 | unsigned char c, b64val; |
| 315 | |
| 316 | while ((slen > 0) && (ret == -1)) { |
| 317 | c = *s; |
| 318 | b64val = table_a2b_base64[c & 0x7f]; |
| 319 | if ( ((c <= 0x7f) && (b64val != (unsigned char)-1)) ) { |
| 320 | if (num == 0) |
| 321 | ret = *s; |
| 322 | num--; |
| 323 | } |
| 324 | |
| 325 | s++; |
| 326 | slen--; |
| 327 | } |
| 328 | return ret; |
| 329 | } |
| 330 | |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 331 | static char doc_a2b_base64[] = "(ascii) -> bin. Decode a line of base64 data"; |
| 332 | |
| 333 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 334 | binascii_a2b_base64(PyObject *self, PyObject *args) |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 335 | { |
| 336 | unsigned char *ascii_data, *bin_data; |
| 337 | int leftbits = 0; |
| 338 | unsigned char this_ch; |
| 339 | unsigned int leftchar = 0; |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 340 | PyObject *rv; |
| 341 | int ascii_len, bin_len; |
Guido van Rossum | 2db4f47 | 1999-10-19 19:05:14 +0000 | [diff] [blame] | 342 | int quad_pos = 0; |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 343 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 344 | if ( !PyArg_ParseTuple(args, "t#:a2b_base64", &ascii_data, &ascii_len) ) |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 345 | return NULL; |
| 346 | |
Peter Schneider-Kamp | d895b20 | 2001-06-07 05:51:36 +0000 | [diff] [blame] | 347 | if ( ascii_len == 0) { |
| 348 | PyErr_SetString(Error, "Cannot decode empty input"); |
| 349 | return NULL; |
| 350 | } |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 351 | bin_len = ((ascii_len+3)/4)*3; /* Upper bound, corrected later */ |
| 352 | |
| 353 | /* Allocate the buffer */ |
| 354 | if ( (rv=PyString_FromStringAndSize(NULL, bin_len)) == NULL ) |
| 355 | return NULL; |
| 356 | bin_data = (unsigned char *)PyString_AsString(rv); |
| 357 | bin_len = 0; |
Guido van Rossum | 2db4f47 | 1999-10-19 19:05:14 +0000 | [diff] [blame] | 358 | |
| 359 | for( ; ascii_len > 0; ascii_len--, ascii_data++) { |
| 360 | this_ch = *ascii_data; |
| 361 | |
| 362 | if (this_ch > 0x7f || |
| 363 | this_ch == '\r' || this_ch == '\n' || this_ch == ' ') |
Jack Jansen | ba1de3b | 1996-01-22 10:47:15 +0000 | [diff] [blame] | 364 | continue; |
Guido van Rossum | 2db4f47 | 1999-10-19 19:05:14 +0000 | [diff] [blame] | 365 | |
| 366 | /* Check for pad sequences and ignore |
| 367 | ** the invalid ones. |
| 368 | */ |
| 369 | if (this_ch == BASE64_PAD) { |
| 370 | if ( (quad_pos < 2) || |
| 371 | ((quad_pos == 2) && |
| 372 | (binascii_find_valid(ascii_data, ascii_len, 1) |
| 373 | != BASE64_PAD)) ) |
| 374 | { |
| 375 | continue; |
| 376 | } |
| 377 | else { |
| 378 | /* A pad sequence means no more input. |
| 379 | ** We've already interpreted the data |
| 380 | ** from the quad at this point. |
| 381 | */ |
| 382 | leftbits = 0; |
| 383 | break; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | this_ch = table_a2b_base64[*ascii_data]; |
| 388 | if ( this_ch == (unsigned char) -1 ) |
| 389 | continue; |
| 390 | |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 391 | /* |
| 392 | ** Shift it in on the low end, and see if there's |
| 393 | ** a byte ready for output. |
| 394 | */ |
Guido van Rossum | 2db4f47 | 1999-10-19 19:05:14 +0000 | [diff] [blame] | 395 | quad_pos = (quad_pos + 1) & 0x03; |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 396 | leftchar = (leftchar << 6) | (this_ch); |
| 397 | leftbits += 6; |
Guido van Rossum | 2db4f47 | 1999-10-19 19:05:14 +0000 | [diff] [blame] | 398 | |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 399 | if ( leftbits >= 8 ) { |
| 400 | leftbits -= 8; |
| 401 | *bin_data++ = (leftchar >> leftbits) & 0xff; |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 402 | bin_len++; |
Guido van Rossum | 2db4f47 | 1999-10-19 19:05:14 +0000 | [diff] [blame] | 403 | leftchar &= ((1 << leftbits) - 1); |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 404 | } |
Guido van Rossum | 2db4f47 | 1999-10-19 19:05:14 +0000 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | if (leftbits != 0) { |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 408 | PyErr_SetString(Error, "Incorrect padding"); |
| 409 | Py_DECREF(rv); |
| 410 | return NULL; |
| 411 | } |
Guido van Rossum | 2db4f47 | 1999-10-19 19:05:14 +0000 | [diff] [blame] | 412 | |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 413 | /* and set string size correctly */ |
| 414 | _PyString_Resize(&rv, bin_len); |
| 415 | return rv; |
| 416 | } |
| 417 | |
| 418 | static char doc_b2a_base64[] = "(bin) -> ascii. Base64-code line of data"; |
| 419 | |
| 420 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 421 | binascii_b2a_base64(PyObject *self, PyObject *args) |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 422 | { |
| 423 | unsigned char *ascii_data, *bin_data; |
| 424 | int leftbits = 0; |
| 425 | unsigned char this_ch; |
| 426 | unsigned int leftchar = 0; |
| 427 | PyObject *rv; |
| 428 | int bin_len; |
| 429 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 430 | if ( !PyArg_ParseTuple(args, "s#:b2a_base64", &bin_data, &bin_len) ) |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 431 | return NULL; |
| 432 | if ( bin_len > BASE64_MAXBIN ) { |
| 433 | PyErr_SetString(Error, "Too much data for base64 line"); |
| 434 | return NULL; |
| 435 | } |
| 436 | |
| 437 | /* We're lazy and allocate to much (fixed up later) */ |
| 438 | if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2)) == NULL ) |
| 439 | return NULL; |
| 440 | ascii_data = (unsigned char *)PyString_AsString(rv); |
| 441 | |
| 442 | for( ; bin_len > 0 ; bin_len--, bin_data++ ) { |
| 443 | /* Shift the data into our buffer */ |
| 444 | leftchar = (leftchar << 8) | *bin_data; |
| 445 | leftbits += 8; |
| 446 | |
| 447 | /* See if there are 6-bit groups ready */ |
| 448 | while ( leftbits >= 6 ) { |
| 449 | this_ch = (leftchar >> (leftbits-6)) & 0x3f; |
| 450 | leftbits -= 6; |
| 451 | *ascii_data++ = table_b2a_base64[this_ch]; |
| 452 | } |
| 453 | } |
| 454 | if ( leftbits == 2 ) { |
| 455 | *ascii_data++ = table_b2a_base64[(leftchar&3) << 4]; |
| 456 | *ascii_data++ = BASE64_PAD; |
| 457 | *ascii_data++ = BASE64_PAD; |
| 458 | } else if ( leftbits == 4 ) { |
| 459 | *ascii_data++ = table_b2a_base64[(leftchar&0xf) << 2]; |
| 460 | *ascii_data++ = BASE64_PAD; |
| 461 | } |
| 462 | *ascii_data++ = '\n'; /* Append a courtesy newline */ |
| 463 | |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 464 | _PyString_Resize(&rv, (ascii_data - |
| 465 | (unsigned char *)PyString_AsString(rv))); |
Jack Jansen | 84bbc2e | 1995-10-04 16:38:44 +0000 | [diff] [blame] | 466 | return rv; |
| 467 | } |
| 468 | |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 469 | static char doc_a2b_hqx[] = "ascii -> bin, done. Decode .hqx coding"; |
| 470 | |
| 471 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 472 | binascii_a2b_hqx(PyObject *self, PyObject *args) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 473 | { |
| 474 | unsigned char *ascii_data, *bin_data; |
| 475 | int leftbits = 0; |
| 476 | unsigned char this_ch; |
Jack Jansen | eaeb1c8 | 1995-08-14 12:17:57 +0000 | [diff] [blame] | 477 | unsigned int leftchar = 0; |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 478 | PyObject *rv; |
| 479 | int len; |
| 480 | int done = 0; |
| 481 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 482 | if ( !PyArg_ParseTuple(args, "t#:a2b_hqx", &ascii_data, &len) ) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 483 | return NULL; |
| 484 | |
| 485 | /* Allocate a string that is too big (fixed later) */ |
| 486 | if ( (rv=PyString_FromStringAndSize(NULL, len)) == NULL ) |
| 487 | return NULL; |
| 488 | bin_data = (unsigned char *)PyString_AsString(rv); |
| 489 | |
| 490 | for( ; len > 0 ; len--, ascii_data++ ) { |
| 491 | /* Get the byte and look it up */ |
| 492 | this_ch = table_a2b_hqx[*ascii_data]; |
| 493 | if ( this_ch == SKIP ) |
| 494 | continue; |
| 495 | if ( this_ch == FAIL ) { |
| 496 | PyErr_SetString(Error, "Illegal char"); |
| 497 | Py_DECREF(rv); |
| 498 | return NULL; |
| 499 | } |
| 500 | if ( this_ch == DONE ) { |
| 501 | /* The terminating colon */ |
| 502 | done = 1; |
| 503 | break; |
| 504 | } |
| 505 | |
| 506 | /* Shift it into the buffer and see if any bytes are ready */ |
| 507 | leftchar = (leftchar << 6) | (this_ch); |
| 508 | leftbits += 6; |
| 509 | if ( leftbits >= 8 ) { |
| 510 | leftbits -= 8; |
| 511 | *bin_data++ = (leftchar >> leftbits) & 0xff; |
| 512 | leftchar &= ((1 << leftbits) - 1); |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | if ( leftbits && !done ) { |
| 517 | PyErr_SetString(Incomplete, |
| 518 | "String has incomplete number of bytes"); |
| 519 | Py_DECREF(rv); |
| 520 | return NULL; |
| 521 | } |
Guido van Rossum | 9c6ba5e | 1997-01-12 20:02:04 +0000 | [diff] [blame] | 522 | _PyString_Resize( |
| 523 | &rv, (bin_data - (unsigned char *)PyString_AsString(rv))); |
| 524 | if (rv) { |
| 525 | PyObject *rrv = Py_BuildValue("Oi", rv, done); |
| 526 | Py_DECREF(rv); |
| 527 | return rrv; |
| 528 | } |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 529 | |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 530 | return NULL; |
| 531 | } |
| 532 | |
| 533 | static char doc_rlecode_hqx[] = "Binhex RLE-code binary data"; |
| 534 | |
| 535 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 536 | binascii_rlecode_hqx(PyObject *self, PyObject *args) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 537 | { |
| 538 | unsigned char *in_data, *out_data; |
| 539 | PyObject *rv; |
| 540 | unsigned char ch; |
| 541 | int in, inend, len; |
| 542 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 543 | if ( !PyArg_ParseTuple(args, "s#:rlecode_hqx", &in_data, &len) ) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 544 | return NULL; |
| 545 | |
| 546 | /* Worst case: output is twice as big as input (fixed later) */ |
| 547 | if ( (rv=PyString_FromStringAndSize(NULL, len*2)) == NULL ) |
| 548 | return NULL; |
| 549 | out_data = (unsigned char *)PyString_AsString(rv); |
| 550 | |
| 551 | for( in=0; in<len; in++) { |
| 552 | ch = in_data[in]; |
| 553 | if ( ch == RUNCHAR ) { |
| 554 | /* RUNCHAR. Escape it. */ |
| 555 | *out_data++ = RUNCHAR; |
| 556 | *out_data++ = 0; |
| 557 | } else { |
| 558 | /* Check how many following are the same */ |
| 559 | for(inend=in+1; |
| 560 | inend<len && in_data[inend] == ch && |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 561 | inend < in+255; |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 562 | inend++) ; |
Jack Jansen | 0223aa1 | 1995-08-31 13:44:23 +0000 | [diff] [blame] | 563 | if ( inend - in > 3 ) { |
| 564 | /* More than 3 in a row. Output RLE. */ |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 565 | *out_data++ = ch; |
| 566 | *out_data++ = RUNCHAR; |
| 567 | *out_data++ = inend-in; |
| 568 | in = inend-1; |
| 569 | } else { |
| 570 | /* Less than 3. Output the byte itself */ |
| 571 | *out_data++ = ch; |
| 572 | } |
| 573 | } |
| 574 | } |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 575 | _PyString_Resize(&rv, (out_data - |
| 576 | (unsigned char *)PyString_AsString(rv))); |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 577 | return rv; |
| 578 | } |
| 579 | |
| 580 | static char doc_b2a_hqx[] = "Encode .hqx data"; |
| 581 | |
| 582 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 583 | binascii_b2a_hqx(PyObject *self, PyObject *args) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 584 | { |
| 585 | unsigned char *ascii_data, *bin_data; |
| 586 | int leftbits = 0; |
| 587 | unsigned char this_ch; |
Jack Jansen | eaeb1c8 | 1995-08-14 12:17:57 +0000 | [diff] [blame] | 588 | unsigned int leftchar = 0; |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 589 | PyObject *rv; |
| 590 | int len; |
| 591 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 592 | if ( !PyArg_ParseTuple(args, "s#:b2a_hqx", &bin_data, &len) ) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 593 | return NULL; |
| 594 | |
| 595 | /* Allocate a buffer that is at least large enough */ |
| 596 | if ( (rv=PyString_FromStringAndSize(NULL, len*2)) == NULL ) |
| 597 | return NULL; |
| 598 | ascii_data = (unsigned char *)PyString_AsString(rv); |
| 599 | |
| 600 | for( ; len > 0 ; len--, bin_data++ ) { |
| 601 | /* Shift into our buffer, and output any 6bits ready */ |
| 602 | leftchar = (leftchar << 8) | *bin_data; |
| 603 | leftbits += 8; |
| 604 | while ( leftbits >= 6 ) { |
| 605 | this_ch = (leftchar >> (leftbits-6)) & 0x3f; |
| 606 | leftbits -= 6; |
| 607 | *ascii_data++ = table_b2a_hqx[this_ch]; |
| 608 | } |
| 609 | } |
| 610 | /* Output a possible runt byte */ |
| 611 | if ( leftbits ) { |
| 612 | leftchar <<= (6-leftbits); |
| 613 | *ascii_data++ = table_b2a_hqx[leftchar & 0x3f]; |
| 614 | } |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 615 | _PyString_Resize(&rv, (ascii_data - |
| 616 | (unsigned char *)PyString_AsString(rv))); |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 617 | return rv; |
| 618 | } |
| 619 | |
| 620 | static char doc_rledecode_hqx[] = "Decode hexbin RLE-coded string"; |
| 621 | |
| 622 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 623 | binascii_rledecode_hqx(PyObject *self, PyObject *args) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 624 | { |
| 625 | unsigned char *in_data, *out_data; |
| 626 | unsigned char in_byte, in_repeat; |
| 627 | PyObject *rv; |
| 628 | int in_len, out_len, out_len_left; |
| 629 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 630 | if ( !PyArg_ParseTuple(args, "s#:rledecode_hqx", &in_data, &in_len) ) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 631 | return NULL; |
| 632 | |
| 633 | /* Empty string is a special case */ |
| 634 | if ( in_len == 0 ) |
| 635 | return Py_BuildValue("s", ""); |
| 636 | |
| 637 | /* Allocate a buffer of reasonable size. Resized when needed */ |
| 638 | out_len = in_len*2; |
| 639 | if ( (rv=PyString_FromStringAndSize(NULL, out_len)) == NULL ) |
| 640 | return NULL; |
| 641 | out_len_left = out_len; |
| 642 | out_data = (unsigned char *)PyString_AsString(rv); |
| 643 | |
| 644 | /* |
| 645 | ** We need two macros here to get/put bytes and handle |
| 646 | ** end-of-buffer for input and output strings. |
| 647 | */ |
| 648 | #define INBYTE(b) \ |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 649 | do { \ |
| 650 | if ( --in_len < 0 ) { \ |
| 651 | PyErr_SetString(Incomplete, ""); \ |
| 652 | Py_DECREF(rv); \ |
| 653 | return NULL; \ |
| 654 | } \ |
| 655 | b = *in_data++; \ |
| 656 | } while(0) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 657 | |
| 658 | #define OUTBYTE(b) \ |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 659 | do { \ |
| 660 | if ( --out_len_left < 0 ) { \ |
| 661 | _PyString_Resize(&rv, 2*out_len); \ |
| 662 | if ( rv == NULL ) return NULL; \ |
| 663 | out_data = (unsigned char *)PyString_AsString(rv) \ |
| 664 | + out_len; \ |
| 665 | out_len_left = out_len-1; \ |
| 666 | out_len = out_len * 2; \ |
| 667 | } \ |
| 668 | *out_data++ = b; \ |
| 669 | } while(0) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 670 | |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 671 | /* |
| 672 | ** Handle first byte separately (since we have to get angry |
| 673 | ** in case of an orphaned RLE code). |
| 674 | */ |
| 675 | INBYTE(in_byte); |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 676 | |
| 677 | if (in_byte == RUNCHAR) { |
| 678 | INBYTE(in_repeat); |
| 679 | if (in_repeat != 0) { |
| 680 | /* Note Error, not Incomplete (which is at the end |
| 681 | ** of the string only). This is a programmer error. |
| 682 | */ |
| 683 | PyErr_SetString(Error, "Orphaned RLE code at start"); |
| 684 | Py_DECREF(rv); |
| 685 | return NULL; |
| 686 | } |
| 687 | OUTBYTE(RUNCHAR); |
| 688 | } else { |
| 689 | OUTBYTE(in_byte); |
| 690 | } |
| 691 | |
| 692 | while( in_len > 0 ) { |
| 693 | INBYTE(in_byte); |
| 694 | |
| 695 | if (in_byte == RUNCHAR) { |
| 696 | INBYTE(in_repeat); |
| 697 | if ( in_repeat == 0 ) { |
| 698 | /* Just an escaped RUNCHAR value */ |
| 699 | OUTBYTE(RUNCHAR); |
| 700 | } else { |
| 701 | /* Pick up value and output a sequence of it */ |
| 702 | in_byte = out_data[-1]; |
| 703 | while ( --in_repeat > 0 ) |
| 704 | OUTBYTE(in_byte); |
| 705 | } |
| 706 | } else { |
| 707 | /* Normal byte */ |
| 708 | OUTBYTE(in_byte); |
| 709 | } |
| 710 | } |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 711 | _PyString_Resize(&rv, (out_data - |
| 712 | (unsigned char *)PyString_AsString(rv))); |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 713 | return rv; |
| 714 | } |
| 715 | |
Roger E. Masse | 5f4ce18 | 1997-01-16 17:10:22 +0000 | [diff] [blame] | 716 | static char doc_crc_hqx[] = |
| 717 | "(data, oldcrc) -> newcrc. Compute hqx CRC incrementally"; |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 718 | |
| 719 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 720 | binascii_crc_hqx(PyObject *self, PyObject *args) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 721 | { |
| 722 | unsigned char *bin_data; |
| 723 | unsigned int crc; |
| 724 | int len; |
| 725 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 726 | if ( !PyArg_ParseTuple(args, "s#i:crc_hqx", &bin_data, &len, &crc) ) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 727 | return NULL; |
| 728 | |
| 729 | while(len--) { |
| 730 | crc=((crc<<8)&0xff00)^crctab_hqx[((crc>>8)&0xff)^*bin_data++]; |
| 731 | } |
| 732 | |
| 733 | return Py_BuildValue("i", crc); |
| 734 | } |
| 735 | |
Guido van Rossum | 7d47c9e | 2000-02-16 21:11:52 +0000 | [diff] [blame] | 736 | static char doc_crc32[] = |
| 737 | "(data, oldcrc = 0) -> newcrc. Compute CRC-32 incrementally"; |
| 738 | |
| 739 | /* Crc - 32 BIT ANSI X3.66 CRC checksum files |
| 740 | Also known as: ISO 3307 |
| 741 | **********************************************************************| |
| 742 | * *| |
| 743 | * Demonstration program to compute the 32-bit CRC used as the frame *| |
| 744 | * check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71 *| |
| 745 | * and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level *| |
| 746 | * protocol). The 32-bit FCS was added via the Federal Register, *| |
| 747 | * 1 June 1982, p.23798. I presume but don't know for certain that *| |
| 748 | * this polynomial is or will be included in CCITT V.41, which *| |
| 749 | * defines the 16-bit CRC (often called CRC-CCITT) polynomial. FIPS *| |
| 750 | * PUB 78 says that the 32-bit FCS reduces otherwise undetected *| |
| 751 | * errors by a factor of 10^-5 over 16-bit FCS. *| |
| 752 | * *| |
| 753 | **********************************************************************| |
| 754 | |
| 755 | Copyright (C) 1986 Gary S. Brown. You may use this program, or |
| 756 | code or tables extracted from it, as desired without restriction. |
| 757 | |
| 758 | First, the polynomial itself and its table of feedback terms. The |
| 759 | polynomial is |
| 760 | 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 |
| 761 | Note that we take it "backwards" and put the highest-order term in |
| 762 | the lowest-order bit. The X^32 term is "implied"; the LSB is the |
| 763 | X^31 term, etc. The X^0 term (usually shown as "+1") results in |
| 764 | the MSB being 1. |
| 765 | |
| 766 | Note that the usual hardware shift register implementation, which |
| 767 | is what we're using (we're merely optimizing it by doing eight-bit |
| 768 | chunks at a time) shifts bits into the lowest-order term. In our |
| 769 | implementation, that means shifting towards the right. Why do we |
| 770 | do it this way? Because the calculated CRC must be transmitted in |
| 771 | order from highest-order term to lowest-order term. UARTs transmit |
| 772 | characters in order from LSB to MSB. By storing the CRC this way, |
| 773 | we hand it to the UART in the order low-byte to high-byte; the UART |
| 774 | sends each low-bit to hight-bit; and the result is transmission bit |
| 775 | by bit from highest- to lowest-order term without requiring any bit |
| 776 | shuffling on our part. Reception works similarly. |
| 777 | |
| 778 | The feedback terms table consists of 256, 32-bit entries. Notes: |
| 779 | |
| 780 | 1. The table can be generated at runtime if desired; code to do so |
| 781 | is shown later. It might not be obvious, but the feedback |
| 782 | terms simply represent the results of eight shift/xor opera- |
| 783 | tions for all combinations of data and CRC register values. |
| 784 | |
| 785 | 2. The CRC accumulation logic is the same for all CRC polynomials, |
| 786 | be they sixteen or thirty-two bits wide. You simply choose the |
| 787 | appropriate table. Alternatively, because the table can be |
| 788 | generated at runtime, you can start by generating the table for |
| 789 | the polynomial in question and use exactly the same "updcrc", |
| 790 | if your application needn't simultaneously handle two CRC |
| 791 | polynomials. (Note, however, that XMODEM is strange.) |
| 792 | |
| 793 | 3. For 16-bit CRCs, the table entries need be only 16 bits wide; |
| 794 | of course, 32-bit entries work OK if the high 16 bits are zero. |
| 795 | |
| 796 | 4. The values must be right-shifted by eight bits by the "updcrc" |
| 797 | logic; the shift must be unsigned (bring in zeroes). On some |
| 798 | hardware you could probably optimize the shift in assembler by |
| 799 | using byte-swap instructions. |
| 800 | ********************************************************************/ |
| 801 | |
| 802 | static unsigned long crc_32_tab[256] = { |
| 803 | 0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL, |
| 804 | 0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL, |
| 805 | 0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL, |
| 806 | 0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL, |
| 807 | 0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL, |
| 808 | 0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL, |
| 809 | 0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL, |
| 810 | 0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL, |
| 811 | 0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL, |
| 812 | 0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL, |
| 813 | 0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL, |
| 814 | 0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL, |
| 815 | 0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL, |
| 816 | 0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL, |
| 817 | 0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL, |
| 818 | 0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL, |
| 819 | 0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL, |
| 820 | 0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL, |
| 821 | 0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL, |
| 822 | 0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL, |
| 823 | 0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL, |
| 824 | 0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL, |
| 825 | 0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL, |
| 826 | 0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL, |
| 827 | 0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL, |
| 828 | 0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL, |
| 829 | 0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL, |
| 830 | 0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL, |
| 831 | 0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL, |
| 832 | 0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL, |
| 833 | 0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL, |
| 834 | 0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL, |
| 835 | 0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL, |
| 836 | 0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL, |
| 837 | 0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL, |
| 838 | 0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL, |
| 839 | 0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL, |
| 840 | 0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL, |
| 841 | 0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL, |
| 842 | 0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL, |
| 843 | 0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL, |
| 844 | 0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL, |
| 845 | 0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL, |
| 846 | 0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL, |
| 847 | 0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL, |
| 848 | 0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL, |
| 849 | 0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL, |
| 850 | 0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL, |
| 851 | 0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL, |
| 852 | 0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL, |
| 853 | 0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL, |
| 854 | 0x2d02ef8dUL |
| 855 | }; |
| 856 | |
| 857 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 858 | binascii_crc32(PyObject *self, PyObject *args) |
Guido van Rossum | 7d47c9e | 2000-02-16 21:11:52 +0000 | [diff] [blame] | 859 | { /* By Jim Ahlstrom; All rights transferred to CNRI */ |
| 860 | unsigned char *bin_data; |
| 861 | unsigned long crc = 0UL; /* initial value of CRC */ |
| 862 | int len; |
| 863 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 864 | if ( !PyArg_ParseTuple(args, "s#|l:crc32", &bin_data, &len, &crc) ) |
Guido van Rossum | 7d47c9e | 2000-02-16 21:11:52 +0000 | [diff] [blame] | 865 | return NULL; |
| 866 | |
| 867 | crc = crc ^ 0xFFFFFFFFUL; |
| 868 | while(len--) |
| 869 | crc = crc_32_tab[(crc ^ *bin_data++) & 0xffUL] ^ (crc >> 8); |
| 870 | /* Note: (crc >> 8) MUST zero fill on left */ |
| 871 | return Py_BuildValue("l", crc ^ 0xFFFFFFFFUL); |
| 872 | } |
| 873 | |
Barry Warsaw | e977c21 | 2000-08-15 06:07:13 +0000 | [diff] [blame] | 874 | |
| 875 | static PyObject * |
| 876 | binascii_hexlify(PyObject *self, PyObject *args) |
| 877 | { |
| 878 | char* argbuf; |
| 879 | int arglen; |
| 880 | PyObject *retval; |
| 881 | char* retbuf; |
| 882 | int i, j; |
| 883 | |
| 884 | if (!PyArg_ParseTuple(args, "t#:b2a_hex", &argbuf, &arglen)) |
| 885 | return NULL; |
| 886 | |
| 887 | retval = PyString_FromStringAndSize(NULL, arglen*2); |
| 888 | if (!retval) |
| 889 | return NULL; |
| 890 | retbuf = PyString_AsString(retval); |
| 891 | if (!retbuf) |
| 892 | goto finally; |
| 893 | |
| 894 | /* make hex version of string, taken from shamodule.c */ |
| 895 | for (i=j=0; i < arglen; i++) { |
| 896 | char c; |
| 897 | c = (argbuf[i] >> 4) & 0xf; |
| 898 | c = (c>9) ? c+'a'-10 : c + '0'; |
| 899 | retbuf[j++] = c; |
| 900 | c = argbuf[i] & 0xf; |
| 901 | c = (c>9) ? c+'a'-10 : c + '0'; |
| 902 | retbuf[j++] = c; |
| 903 | } |
| 904 | return retval; |
| 905 | |
| 906 | finally: |
| 907 | Py_DECREF(retval); |
| 908 | return NULL; |
| 909 | } |
| 910 | |
| 911 | static char doc_hexlify[] = |
| 912 | "b2a_hex(data) -> s; Hexadecimal representation of binary data.\n\ |
| 913 | \n\ |
| 914 | This function is also available as \"hexlify()\"."; |
| 915 | |
| 916 | |
| 917 | static int |
Tim Peters | b59ab42 | 2000-08-15 16:41:26 +0000 | [diff] [blame] | 918 | to_int(int c) |
Barry Warsaw | e977c21 | 2000-08-15 06:07:13 +0000 | [diff] [blame] | 919 | { |
| 920 | if (isdigit(c)) |
| 921 | return c - '0'; |
| 922 | else { |
| 923 | if (isupper(c)) |
| 924 | c = tolower(c); |
| 925 | if (c >= 'a' && c <= 'f') |
| 926 | return c - 'a' + 10; |
| 927 | } |
| 928 | return -1; |
| 929 | } |
| 930 | |
| 931 | |
| 932 | static PyObject * |
| 933 | binascii_unhexlify(PyObject *self, PyObject *args) |
| 934 | { |
| 935 | char* argbuf; |
| 936 | int arglen; |
| 937 | PyObject *retval; |
| 938 | char* retbuf; |
| 939 | int i, j; |
| 940 | |
| 941 | if (!PyArg_ParseTuple(args, "s#:a2b_hex", &argbuf, &arglen)) |
| 942 | return NULL; |
| 943 | |
Barry Warsaw | 1616847 | 2000-08-15 06:59:58 +0000 | [diff] [blame] | 944 | /* XXX What should we do about strings with an odd length? Should |
| 945 | * we add an implicit leading zero, or a trailing zero? For now, |
| 946 | * raise an exception. |
Barry Warsaw | e977c21 | 2000-08-15 06:07:13 +0000 | [diff] [blame] | 947 | */ |
| 948 | if (arglen % 2) { |
Barry Warsaw | 1616847 | 2000-08-15 06:59:58 +0000 | [diff] [blame] | 949 | PyErr_SetString(PyExc_TypeError, "Odd-length string"); |
Barry Warsaw | e977c21 | 2000-08-15 06:07:13 +0000 | [diff] [blame] | 950 | return NULL; |
| 951 | } |
| 952 | |
| 953 | retval = PyString_FromStringAndSize(NULL, (arglen/2)); |
| 954 | if (!retval) |
| 955 | return NULL; |
| 956 | retbuf = PyString_AsString(retval); |
| 957 | if (!retbuf) |
| 958 | goto finally; |
| 959 | |
| 960 | for (i=j=0; i < arglen; i += 2) { |
| 961 | int top = to_int(Py_CHARMASK(argbuf[i])); |
| 962 | int bot = to_int(Py_CHARMASK(argbuf[i+1])); |
| 963 | if (top == -1 || bot == -1) { |
| 964 | PyErr_SetString(PyExc_TypeError, |
Barry Warsaw | 1616847 | 2000-08-15 06:59:58 +0000 | [diff] [blame] | 965 | "Non-hexadecimal digit found"); |
Barry Warsaw | e977c21 | 2000-08-15 06:07:13 +0000 | [diff] [blame] | 966 | goto finally; |
| 967 | } |
| 968 | retbuf[j++] = (top << 4) + bot; |
| 969 | } |
| 970 | return retval; |
| 971 | |
| 972 | finally: |
| 973 | Py_DECREF(retval); |
| 974 | return NULL; |
| 975 | } |
| 976 | |
| 977 | static char doc_unhexlify[] = |
| 978 | "a2b_hex(hexstr) -> s; Binary data of hexadecimal representation.\n\ |
| 979 | \n\ |
| 980 | hexstr must contain an even number of hex digits (upper or lower case).\n\ |
| 981 | This function is also available as \"unhexlify()\""; |
| 982 | |
Martin v. Löwis | 16dc7f4 | 2001-09-30 20:32:11 +0000 | [diff] [blame] | 983 | static int table_hex[128] = { |
| 984 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| 985 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| 986 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| 987 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1, -1,-1,-1,-1, |
| 988 | -1,10,11,12, 13,14,15,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| 989 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| 990 | -1,10,11,12, 13,14,15,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| 991 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1 |
| 992 | }; |
| 993 | |
| 994 | #define hexval(c) table_hex[(unsigned int)(c)] |
| 995 | |
| 996 | #define MAXLINESIZE 76 |
| 997 | |
| 998 | static char doc_a2b_qp[] = "Decode a string of qp-encoded data"; |
| 999 | |
| 1000 | static PyObject* |
| 1001 | binascii_a2b_qp(PyObject *self, PyObject *args, PyObject *kwargs) |
| 1002 | { |
| 1003 | unsigned int in, out; |
| 1004 | char ch; |
| 1005 | unsigned char *data, *odata; |
| 1006 | unsigned int datalen = 0; |
| 1007 | PyObject *rv; |
| 1008 | static char *kwlist[] = {"data", "header", NULL}; |
| 1009 | int header = 0; |
| 1010 | |
| 1011 | if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|i", kwlist, &data, |
| 1012 | &datalen, &header)) |
| 1013 | return NULL; |
| 1014 | |
| 1015 | /* We allocate the output same size as input, this is overkill */ |
Greg Ward | a645b30 | 2001-10-04 14:54:53 +0000 | [diff] [blame] | 1016 | odata = (unsigned char *) calloc(1, datalen); |
Martin v. Löwis | 16dc7f4 | 2001-09-30 20:32:11 +0000 | [diff] [blame] | 1017 | |
| 1018 | if (odata == NULL) { |
| 1019 | PyErr_NoMemory(); |
| 1020 | return NULL; |
| 1021 | } |
| 1022 | |
| 1023 | in = out = 0; |
| 1024 | while (in < datalen) { |
| 1025 | if (data[in] == '=') { |
| 1026 | in++; |
| 1027 | if (in >= datalen) break; |
| 1028 | /* Soft line breaks */ |
| 1029 | if ((data[in] == '\n') || (data[in] == '\r') || |
| 1030 | (data[in] == ' ') || (data[in] == '\t')) { |
| 1031 | if (data[in] != '\n') { |
| 1032 | while (in < datalen && data[in] != '\n') in++; |
| 1033 | } |
| 1034 | if (in < datalen) in++; |
| 1035 | } |
| 1036 | else if (data[in] == '=') { |
| 1037 | /* broken case from broken python qp */ |
| 1038 | odata[out++] = '='; |
| 1039 | in++; |
| 1040 | } |
| 1041 | else if (((data[in] >= 'A' && data[in] <= 'F') || |
| 1042 | (data[in] >= 'a' && data[in] <= 'f') || |
| 1043 | (data[in] >= '0' && data[in] <= '9')) && |
| 1044 | ((data[in+1] >= 'A' && data[in+1] <= 'F') || |
| 1045 | (data[in+1] >= 'a' && data[in+1] <= 'f') || |
| 1046 | (data[in+1] >= '0' && data[in+1] <= '9'))) { |
| 1047 | /* hexval */ |
| 1048 | ch = hexval(data[in]) << 4; |
| 1049 | in++; |
| 1050 | ch |= hexval(data[in]); |
| 1051 | in++; |
| 1052 | odata[out++] = ch; |
| 1053 | } |
| 1054 | else { |
| 1055 | odata[out++] = '='; |
| 1056 | } |
| 1057 | } |
| 1058 | else if (header && data[in] == '_') { |
| 1059 | odata[out++] = ' '; |
| 1060 | in++; |
| 1061 | } |
| 1062 | else { |
| 1063 | odata[out] = data[in]; |
| 1064 | in++; |
| 1065 | out++; |
| 1066 | } |
| 1067 | } |
Greg Ward | a645b30 | 2001-10-04 14:54:53 +0000 | [diff] [blame] | 1068 | if ((rv = PyString_FromStringAndSize((char *)odata, out)) == NULL) { |
Martin v. Löwis | 16dc7f4 | 2001-09-30 20:32:11 +0000 | [diff] [blame] | 1069 | free (odata); |
| 1070 | return NULL; |
| 1071 | } |
| 1072 | free (odata); |
| 1073 | return rv; |
| 1074 | } |
| 1075 | |
| 1076 | static int |
| 1077 | to_hex (unsigned char ch, unsigned char *s) |
| 1078 | { |
| 1079 | unsigned int uvalue = ch; |
| 1080 | |
| 1081 | s[1] = "0123456789ABCDEF"[uvalue % 16]; |
| 1082 | uvalue = (uvalue / 16); |
| 1083 | s[0] = "0123456789ABCDEF"[uvalue % 16]; |
| 1084 | return 0; |
| 1085 | } |
| 1086 | |
| 1087 | static char doc_b2a_qp[] = |
| 1088 | "b2a_qp(data, quotetabs=0, istext=1, header=0) -> s; \n\ |
| 1089 | Encode a string using quoted-printable encoding. \n\ |
| 1090 | \n\ |
| 1091 | On encoding, when istext is set, newlines are not encoded, and white \n\ |
| 1092 | space at end of lines is. When istext is not set, \\r and \\n (CR/LF) are \n\ |
| 1093 | both encoded. When quotetabs is set, space and tabs are encoded."; |
| 1094 | |
| 1095 | /* XXX: This is ridiculously complicated to be backward compatible |
| 1096 | * (mostly) with the quopri module. It doesn't re-create the quopri |
| 1097 | * module bug where text ending in CRLF has the CR encoded */ |
| 1098 | static PyObject* |
| 1099 | binascii_b2a_qp (PyObject *self, PyObject *args, PyObject *kwargs) |
| 1100 | { |
| 1101 | unsigned int in, out; |
| 1102 | unsigned char *data, *odata; |
| 1103 | unsigned int datalen = 0, odatalen = 0; |
| 1104 | PyObject *rv; |
| 1105 | unsigned int linelen = 0; |
| 1106 | static char *kwlist[] = {"data", "quotetabs", "istext", "header", NULL}; |
| 1107 | int istext = 1; |
| 1108 | int quotetabs = 0; |
| 1109 | int header = 0; |
| 1110 | unsigned char ch; |
| 1111 | int crlf = 0; |
| 1112 | unsigned char *p; |
| 1113 | |
| 1114 | if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|iii", kwlist, &data, |
| 1115 | &datalen, "etabs, &istext, &header)) |
| 1116 | return NULL; |
| 1117 | |
| 1118 | /* See if this string is using CRLF line ends */ |
| 1119 | /* XXX: this function has the side effect of converting all of |
| 1120 | * the end of lines to be the same depending on this detection |
| 1121 | * here */ |
Greg Ward | a645b30 | 2001-10-04 14:54:53 +0000 | [diff] [blame] | 1122 | p = (unsigned char *) strchr((char *)data, '\n'); |
Martin v. Löwis | 16dc7f4 | 2001-09-30 20:32:11 +0000 | [diff] [blame] | 1123 | if ((p != NULL) && (p > data) && (*(p-1) == '\r')) |
| 1124 | crlf = 1; |
| 1125 | |
| 1126 | /* First, scan to see how many characters need to be encoded */ |
| 1127 | in = 0; |
| 1128 | while (in < datalen) { |
| 1129 | if ((data[in] > 126) || |
| 1130 | (data[in] == '=') || |
| 1131 | (header && data[in] == '_') || |
| 1132 | ((data[in] == '.') && (linelen == 1)) || |
| 1133 | (!istext && ((data[in] == '\r') || (data[in] == '\n'))) || |
| 1134 | ((data[in] == '\t' || data[in] == ' ') && (in + 1 == datalen)) || |
| 1135 | ((data[in] < 33) && |
| 1136 | (data[in] != '\r') && (data[in] != '\n') && |
| 1137 | (quotetabs && ((data[in] != '\t') || (data[in] != ' '))))) |
| 1138 | { |
| 1139 | if ((linelen + 3) >= MAXLINESIZE) { |
| 1140 | linelen = 0; |
| 1141 | if (crlf) |
| 1142 | odatalen += 3; |
| 1143 | else |
| 1144 | odatalen += 2; |
| 1145 | } |
| 1146 | linelen += 3; |
| 1147 | odatalen += 3; |
| 1148 | in++; |
| 1149 | } |
| 1150 | else { |
| 1151 | if (istext && |
| 1152 | ((data[in] == '\n') || |
| 1153 | ((in+1 < datalen) && (data[in] == '\r') && |
| 1154 | (data[in+1] == '\n')))) |
| 1155 | { |
| 1156 | linelen = 0; |
| 1157 | /* Protect against whitespace on end of line */ |
| 1158 | if (in && ((data[in-1] == ' ') || (data[in-1] == '\t'))) |
| 1159 | odatalen += 2; |
| 1160 | if (crlf) |
| 1161 | odatalen += 2; |
| 1162 | else |
| 1163 | odatalen += 1; |
| 1164 | if (data[in] == '\r') |
| 1165 | in += 2; |
| 1166 | else |
| 1167 | in++; |
| 1168 | } |
| 1169 | else { |
| 1170 | if ((in + 1 != datalen) && |
| 1171 | (data[in+1] != '\n') && |
| 1172 | (linelen + 1) >= MAXLINESIZE) { |
| 1173 | linelen = 0; |
| 1174 | if (crlf) |
| 1175 | odatalen += 3; |
| 1176 | else |
| 1177 | odatalen += 2; |
| 1178 | } |
| 1179 | linelen++; |
| 1180 | odatalen++; |
| 1181 | in++; |
| 1182 | } |
| 1183 | } |
| 1184 | } |
| 1185 | |
Greg Ward | a645b30 | 2001-10-04 14:54:53 +0000 | [diff] [blame] | 1186 | odata = (unsigned char *) calloc(1, odatalen); |
Martin v. Löwis | 16dc7f4 | 2001-09-30 20:32:11 +0000 | [diff] [blame] | 1187 | |
| 1188 | if (odata == NULL) { |
| 1189 | PyErr_NoMemory(); |
| 1190 | return NULL; |
| 1191 | } |
| 1192 | |
| 1193 | in = out = linelen = 0; |
| 1194 | while (in < datalen) { |
| 1195 | if ((data[in] > 126) || |
| 1196 | (data[in] == '=') || |
| 1197 | (header && data[in] == '_') || |
| 1198 | ((data[in] == '.') && (linelen == 1)) || |
| 1199 | (!istext && ((data[in] == '\r') || (data[in] == '\n'))) || |
| 1200 | ((data[in] == '\t' || data[in] == ' ') && (in + 1 == datalen)) || |
| 1201 | ((data[in] < 33) && |
| 1202 | (data[in] != '\r') && (data[in] != '\n') && |
| 1203 | (quotetabs && ((data[in] != '\t') || (data[in] != ' '))))) |
| 1204 | { |
| 1205 | if ((linelen + 3 )>= MAXLINESIZE) { |
| 1206 | odata[out++] = '='; |
| 1207 | if (crlf) odata[out++] = '\r'; |
| 1208 | odata[out++] = '\n'; |
| 1209 | linelen = 0; |
| 1210 | } |
| 1211 | odata[out++] = '='; |
| 1212 | to_hex(data[in], &odata[out]); |
| 1213 | out += 2; |
| 1214 | in++; |
| 1215 | linelen += 3; |
| 1216 | } |
| 1217 | else { |
| 1218 | if (istext && |
| 1219 | ((data[in] == '\n') || |
| 1220 | ((in+1 < datalen) && (data[in] == '\r') && |
| 1221 | (data[in+1] == '\n')))) |
| 1222 | { |
| 1223 | linelen = 0; |
| 1224 | /* Protect against whitespace on end of line */ |
| 1225 | if (out && ((odata[out-1] == ' ') || (odata[out-1] == '\t'))) { |
| 1226 | ch = odata[out-1]; |
| 1227 | odata[out-1] = '='; |
| 1228 | to_hex(ch, &odata[out]); |
| 1229 | out += 2; |
| 1230 | } |
| 1231 | |
| 1232 | if (crlf) odata[out++] = '\r'; |
| 1233 | odata[out++] = '\n'; |
| 1234 | if (data[in] == '\r') |
| 1235 | in += 2; |
| 1236 | else |
| 1237 | in++; |
| 1238 | } |
| 1239 | else { |
| 1240 | if ((in + 1 != datalen) && |
| 1241 | (data[in+1] != '\n') && |
| 1242 | (linelen + 1) >= MAXLINESIZE) { |
| 1243 | odata[out++] = '='; |
| 1244 | if (crlf) odata[out++] = '\r'; |
| 1245 | odata[out++] = '\n'; |
| 1246 | linelen = 0; |
| 1247 | } |
| 1248 | linelen++; |
| 1249 | if (header && data[in] == ' ') { |
| 1250 | odata[out++] = '_'; |
| 1251 | in++; |
| 1252 | } |
| 1253 | else { |
| 1254 | odata[out++] = data[in++]; |
| 1255 | } |
| 1256 | } |
| 1257 | } |
| 1258 | } |
Greg Ward | a645b30 | 2001-10-04 14:54:53 +0000 | [diff] [blame] | 1259 | if ((rv = PyString_FromStringAndSize((char *)odata, out)) == NULL) { |
Martin v. Löwis | 16dc7f4 | 2001-09-30 20:32:11 +0000 | [diff] [blame] | 1260 | free (odata); |
| 1261 | return NULL; |
| 1262 | } |
| 1263 | free (odata); |
| 1264 | return rv; |
| 1265 | } |
Barry Warsaw | e977c21 | 2000-08-15 06:07:13 +0000 | [diff] [blame] | 1266 | |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 1267 | /* List of functions defined in the module */ |
| 1268 | |
| 1269 | static struct PyMethodDef binascii_module_methods[] = { |
Barry Warsaw | e977c21 | 2000-08-15 06:07:13 +0000 | [diff] [blame] | 1270 | {"a2b_uu", binascii_a2b_uu, METH_VARARGS, doc_a2b_uu}, |
| 1271 | {"b2a_uu", binascii_b2a_uu, METH_VARARGS, doc_b2a_uu}, |
| 1272 | {"a2b_base64", binascii_a2b_base64, METH_VARARGS, doc_a2b_base64}, |
| 1273 | {"b2a_base64", binascii_b2a_base64, METH_VARARGS, doc_b2a_base64}, |
| 1274 | {"a2b_hqx", binascii_a2b_hqx, METH_VARARGS, doc_a2b_hqx}, |
| 1275 | {"b2a_hqx", binascii_b2a_hqx, METH_VARARGS, doc_b2a_hqx}, |
| 1276 | {"b2a_hex", binascii_hexlify, METH_VARARGS, doc_hexlify}, |
| 1277 | {"a2b_hex", binascii_unhexlify, METH_VARARGS, doc_unhexlify}, |
| 1278 | {"hexlify", binascii_hexlify, METH_VARARGS, doc_hexlify}, |
| 1279 | {"unhexlify", binascii_unhexlify, METH_VARARGS, doc_unhexlify}, |
| 1280 | {"rlecode_hqx", binascii_rlecode_hqx, METH_VARARGS, doc_rlecode_hqx}, |
| 1281 | {"rledecode_hqx", binascii_rledecode_hqx, METH_VARARGS, |
| 1282 | doc_rledecode_hqx}, |
| 1283 | {"crc_hqx", binascii_crc_hqx, METH_VARARGS, doc_crc_hqx}, |
| 1284 | {"crc32", binascii_crc32, METH_VARARGS, doc_crc32}, |
Martin v. Löwis | 16dc7f4 | 2001-09-30 20:32:11 +0000 | [diff] [blame] | 1285 | {"a2b_qp", (PyCFunction)binascii_a2b_qp, METH_VARARGS | METH_KEYWORDS, |
| 1286 | doc_a2b_qp}, |
| 1287 | {"b2a_qp", (PyCFunction)binascii_b2a_qp, METH_VARARGS | METH_KEYWORDS, |
| 1288 | doc_b2a_qp}, |
Barry Warsaw | e977c21 | 2000-08-15 06:07:13 +0000 | [diff] [blame] | 1289 | {NULL, NULL} /* sentinel */ |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 1290 | }; |
| 1291 | |
| 1292 | |
| 1293 | /* Initialization function for the module (*must* be called initbinascii) */ |
| 1294 | static char doc_binascii[] = "Conversion between binary data and ASCII"; |
| 1295 | |
Guido van Rossum | 3886bb6 | 1998-12-04 18:50:17 +0000 | [diff] [blame] | 1296 | DL_EXPORT(void) |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 1297 | initbinascii(void) |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 1298 | { |
| 1299 | PyObject *m, *d, *x; |
| 1300 | |
| 1301 | /* Create the module and add the functions */ |
| 1302 | m = Py_InitModule("binascii", binascii_module_methods); |
| 1303 | |
| 1304 | d = PyModule_GetDict(m); |
| 1305 | x = PyString_FromString(doc_binascii); |
| 1306 | PyDict_SetItemString(d, "__doc__", x); |
Guido van Rossum | 5c159bd | 1997-08-04 23:55:25 +0000 | [diff] [blame] | 1307 | Py_XDECREF(x); |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 1308 | |
Guido van Rossum | 7dbb48a | 1997-10-08 15:26:07 +0000 | [diff] [blame] | 1309 | Error = PyErr_NewException("binascii.Error", NULL, NULL); |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 1310 | PyDict_SetItemString(d, "Error", Error); |
Guido van Rossum | 7dbb48a | 1997-10-08 15:26:07 +0000 | [diff] [blame] | 1311 | Incomplete = PyErr_NewException("binascii.Incomplete", NULL, NULL); |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 1312 | PyDict_SetItemString(d, "Incomplete", Incomplete); |
Jack Jansen | 7278119 | 1995-08-07 14:34:15 +0000 | [diff] [blame] | 1313 | } |