[5c26cf]: Modules / binascii.c Maximize Restore History

Repo status: analyzing...

Download this file

binascii.c    1386 lines (1225 with data), 43.0 kB

   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
  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
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
/*
** 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.
*/
#include "Python.h"
static PyObject *Error;
static PyObject *Incomplete;
/*
** hqx lookup table, ascii->binary.
*/
#define RUNCHAR 0x90
#define DONE 0x7F
#define SKIP 0x7E
#define FAIL 0x7D
static unsigned char table_a2b_hqx[256] = {
/* ^@ ^A ^B ^C ^D ^E ^F ^G */
/* 0*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
/* \b \t \n ^K ^L \r ^N ^O */
/* 1*/ FAIL, FAIL, SKIP, FAIL, FAIL, SKIP, FAIL, FAIL,
/* ^P ^Q ^R ^S ^T ^U ^V ^W */
/* 2*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
/* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
/* 3*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
/* ! " # $ % & ' */
/* 4*/ FAIL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
/* ( ) * + , - . / */
/* 5*/ 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, FAIL, FAIL,
/* 0 1 2 3 4 5 6 7 */
/* 6*/ 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, FAIL,
/* 8 9 : ; < = > ? */
/* 7*/ 0x14, 0x15, DONE, FAIL, FAIL, FAIL, FAIL, FAIL,
/* @ A B C D E F G */
/* 8*/ 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D,
/* H I J K L M N O */
/* 9*/ 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, FAIL,
/* P Q R S T U V W */
/*10*/ 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, FAIL,
/* X Y Z [ \ ] ^ _ */
/*11*/ 0x2C, 0x2D, 0x2E, 0x2F, FAIL, FAIL, FAIL, FAIL,
/* ` a b c d e f g */
/*12*/ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, FAIL,
/* h i j k l m n o */
/*13*/ 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, FAIL, FAIL,
/* p q r s t u v w */
/*14*/ 0x3D, 0x3E, 0x3F, FAIL, FAIL, FAIL, FAIL, FAIL,
/* x y z { | } ~ ^? */
/*15*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
/*16*/ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
};
static unsigned char table_b2a_hqx[] =
"!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr";
static 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 (INT_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)
{
unsigned char *ascii_data, *bin_data;
int leftbits = 0;
unsigned char this_ch;
unsigned int leftchar = 0;
PyObject *rv;
int ascii_len, bin_len;
if ( !PyArg_ParseTuple(args, "t#:a2b_uu", &ascii_data, &ascii_len) )
return NULL;
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 )
return NULL;
bin_data = (unsigned char *)PyString_AsString(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");
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");
Py_DECREF(rv);
return NULL;
}
}
return rv;
}
PyDoc_STRVAR(doc_b2a_uu, "(bin) -> ascii. Uuencode line of data");
static PyObject *
binascii_b2a_uu(PyObject *self, PyObject *args)
{
unsigned char *ascii_data, *bin_data;
int leftbits = 0;
unsigned char this_ch;
unsigned int leftchar = 0;
PyObject *rv;
int bin_len;
if ( !PyArg_ParseTuple(args, "s#:b2a_uu", &bin_data, &bin_len) )
return NULL;
if ( bin_len > 45 ) {
/* The 45 is a limit that appears in all uuencode's */
PyErr_SetString(Error, "At most 45 bytes at once");
return NULL;
}
/* We're lazy and allocate to much (fixed up later) */
if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2+2)) == NULL )
return NULL;
ascii_data = (unsigned char *)PyString_AsString(rv);
/* Store the length */
*ascii_data++ = ' ' + (bin_len & 077);
for( ; bin_len > 0 || leftbits != 0 ; bin_len--, bin_data++ ) {
/* Shift the data (or padding) into our buffer */
if ( bin_len > 0 ) /* Data */
leftchar = (leftchar << 8) | *bin_data;
else /* Padding */
leftchar <<= 8;
leftbits += 8;
/* See if there are 6-bit groups ready */
while ( leftbits >= 6 ) {
this_ch = (leftchar >> (leftbits-6)) & 0x3f;
leftbits -= 6;
*ascii_data++ = this_ch + ' ';
}
}
*ascii_data++ = '\n'; /* Append a courtesy newline */
_PyString_Resize(&rv, (ascii_data -
(unsigned char *)PyString_AsString(rv)));
return rv;
}
static int
binascii_find_valid(unsigned char *s, int 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)
{
unsigned char *ascii_data, *bin_data;
int leftbits = 0;
unsigned char this_ch;
unsigned int leftchar = 0;
PyObject *rv;
int ascii_len, bin_len;
int quad_pos = 0;
if ( !PyArg_ParseTuple(args, "t#:a2b_base64", &ascii_data, &ascii_len) )
return NULL;
assert(ascii_len >= 0);
if (ascii_len > INT_MAX - 3)
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 )
return NULL;
bin_data = (unsigned char *)PyString_AsString(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) {
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)
_PyString_Resize(&rv, bin_len);
else {
Py_DECREF(rv);
rv = PyString_FromString("");
}
return rv;
}
PyDoc_STRVAR(doc_b2a_base64, "(bin) -> ascii. Base64-code line of data");
static PyObject *
binascii_b2a_base64(PyObject *self, PyObject *args)
{
unsigned char *ascii_data, *bin_data;
int leftbits = 0;
unsigned char this_ch;
unsigned int leftchar = 0;
PyObject *rv;
int bin_len;
if ( !PyArg_ParseTuple(args, "s#:b2a_base64", &bin_data, &bin_len) )
return NULL;
assert(bin_len >= 0);
if ( bin_len > BASE64_MAXBIN ) {
PyErr_SetString(Error, "Too much data for base64 line");
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 )
return NULL;
ascii_data = (unsigned char *)PyString_AsString(rv);
for( ; bin_len > 0 ; bin_len--, bin_data++ ) {
/* Shift the data into our buffer */
leftchar = (leftchar << 8) | *bin_data;
leftbits += 8;
/* See if there are 6-bit groups ready */
while ( leftbits >= 6 ) {
this_ch = (leftchar >> (leftbits-6)) & 0x3f;
leftbits -= 6;
*ascii_data++ = table_b2a_base64[this_ch];
}
}
if ( leftbits == 2 ) {
*ascii_data++ = table_b2a_base64[(leftchar&3) << 4];
*ascii_data++ = BASE64_PAD;
*ascii_data++ = BASE64_PAD;
} else if ( leftbits == 4 ) {
*ascii_data++ = table_b2a_base64[(leftchar&0xf) << 2];
*ascii_data++ = BASE64_PAD;
}
*ascii_data++ = '\n'; /* Append a courtesy newline */
_PyString_Resize(&rv, (ascii_data -
(unsigned char *)PyString_AsString(rv)));
return rv;
}
PyDoc_STRVAR(doc_a2b_hqx, "ascii -> bin, done. Decode .hqx coding");
static PyObject *
binascii_a2b_hqx(PyObject *self, PyObject *args)
{
unsigned char *ascii_data, *bin_data;
int leftbits = 0;
unsigned char this_ch;
unsigned int leftchar = 0;
PyObject *rv;
int len;
int done = 0;
if ( !PyArg_ParseTuple(args, "t#:a2b_hqx", &ascii_data, &len) )
return NULL;
assert(len >= 0);
if (len > INT_MAX - 2)
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 )
return NULL;
bin_data = (unsigned char *)PyString_AsString(rv);
for( ; len > 0 ; len--, ascii_data++ ) {
/* Get the byte and look it up */
this_ch = table_a2b_hqx[*ascii_data];
if ( this_ch == SKIP )
continue;
if ( this_ch == FAIL ) {
PyErr_SetString(Error, "Illegal char");
Py_DECREF(rv);
return NULL;
}
if ( this_ch == DONE ) {
/* The terminating colon */
done = 1;
break;
}
/* Shift it into the buffer and see if any bytes are ready */
leftchar = (leftchar << 6) | (this_ch);
leftbits += 6;
if ( leftbits >= 8 ) {
leftbits -= 8;
*bin_data++ = (leftchar >> leftbits) & 0xff;
leftchar &= ((1 << leftbits) - 1);
}
}
if ( leftbits && !done ) {
PyErr_SetString(Incomplete,
"String has incomplete number of bytes");
Py_DECREF(rv);
return NULL;
}
_PyString_Resize(
&rv, (bin_data - (unsigned char *)PyString_AsString(rv)));
if (rv) {
PyObject *rrv = Py_BuildValue("Oi", rv, done);
Py_DECREF(rv);
return rrv;
}
return NULL;
}
PyDoc_STRVAR(doc_rlecode_hqx, "Binhex RLE-code binary data");
static PyObject *
binascii_rlecode_hqx(PyObject *self, PyObject *args)
{
unsigned char *in_data, *out_data;
PyObject *rv;
unsigned char ch;
int in, inend, len;
if ( !PyArg_ParseTuple(args, "s#:rlecode_hqx", &in_data, &len) )
return NULL;
assert(len >= 0);
if (len > INT_MAX / 2 - 2)
return PyErr_NoMemory();
/* Worst case: output is twice as big as input (fixed later) */
if ( (rv=PyString_FromStringAndSize(NULL, len*2+2)) == NULL )
return NULL;
out_data = (unsigned char *)PyString_AsString(rv);
for( in=0; in<len; in++) {
ch = in_data[in];
if ( ch == RUNCHAR ) {
/* RUNCHAR. Escape it. */
*out_data++ = RUNCHAR;
*out_data++ = 0;
} else {
/* Check how many following are the same */
for(inend=in+1;
inend<len && in_data[inend] == ch &&
inend < in+255;
inend++) ;
if ( inend - in > 3 ) {
/* More than 3 in a row. Output RLE. */
*out_data++ = ch;
*out_data++ = RUNCHAR;
*out_data++ = inend-in;
in = inend-1;
} else {
/* Less than 3. Output the byte itself */
*out_data++ = ch;
}
}
}
_PyString_Resize(&rv, (out_data -
(unsigned char *)PyString_AsString(rv)));
return rv;
}
PyDoc_STRVAR(doc_b2a_hqx, "Encode .hqx data");
static PyObject *
binascii_b2a_hqx(PyObject *self, PyObject *args)
{
unsigned char *ascii_data, *bin_data;
int leftbits = 0;
unsigned char this_ch;
unsigned int leftchar = 0;
PyObject *rv;
int len;
if ( !PyArg_ParseTuple(args, "s#:b2a_hqx", &bin_data, &len) )
return NULL;
assert(len >= 0);
if (len > INT_MAX / 2 - 2)
return PyErr_NoMemory();
/* Allocate a buffer that is at least large enough */
if ( (rv=PyString_FromStringAndSize(NULL, len*2+2)) == NULL )
return NULL;
ascii_data = (unsigned char *)PyString_AsString(rv);
for( ; len > 0 ; len--, bin_data++ ) {
/* Shift into our buffer, and output any 6bits ready */
leftchar = (leftchar << 8) | *bin_data;
leftbits += 8;
while ( leftbits >= 6 ) {
this_ch = (leftchar >> (leftbits-6)) & 0x3f;
leftbits -= 6;
*ascii_data++ = table_b2a_hqx[this_ch];
}
}
/* Output a possible runt byte */
if ( leftbits ) {
leftchar <<= (6-leftbits);
*ascii_data++ = table_b2a_hqx[leftchar & 0x3f];
}
_PyString_Resize(&rv, (ascii_data -
(unsigned char *)PyString_AsString(rv)));
return rv;
}
PyDoc_STRVAR(doc_rledecode_hqx, "Decode hexbin RLE-coded string");
static PyObject *
binascii_rledecode_hqx(PyObject *self, PyObject *args)
{
unsigned char *in_data, *out_data;
unsigned char in_byte, in_repeat;
PyObject *rv;
int in_len, out_len, out_len_left;
if ( !PyArg_ParseTuple(args, "s#:rledecode_hqx", &in_data, &in_len) )
return NULL;
assert(in_len >= 0);
/* Empty string is a special case */
if ( in_len == 0 )
return Py_BuildValue("s", "");
else if (in_len > INT_MAX / 2)
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 )
return NULL;
out_len_left = out_len;
out_data = (unsigned char *)PyString_AsString(rv);
/*
** We need two macros here to get/put bytes and handle
** end-of-buffer for input and output strings.
*/
#define INBYTE(b) \
do { \
if ( --in_len < 0 ) { \
PyErr_SetString(Incomplete, ""); \
Py_DECREF(rv); \
return NULL; \
} \
b = *in_data++; \
} while(0)
#define OUTBYTE(b) \
do { \
if ( --out_len_left < 0 ) { \
if ( out_len > INT_MAX / 2) return PyErr_NoMemory(); \
_PyString_Resize(&rv, 2*out_len); \
if ( rv == NULL ) return NULL; \
out_data = (unsigned char *)PyString_AsString(rv) \
+ out_len; \
out_len_left = out_len-1; \
out_len = out_len * 2; \
} \
*out_data++ = b; \
} while(0)
/*
** Handle first byte separately (since we have to get angry
** in case of an orphaned RLE code).
*/
INBYTE(in_byte);
if (in_byte == RUNCHAR) {
INBYTE(in_repeat);
if (in_repeat != 0) {
/* Note Error, not Incomplete (which is at the end
** of the string only). This is a programmer error.
*/
PyErr_SetString(Error, "Orphaned RLE code at start");
Py_DECREF(rv);
return NULL;
}
OUTBYTE(RUNCHAR);
} else {
OUTBYTE(in_byte);
}
while( in_len > 0 ) {
INBYTE(in_byte);
if (in_byte == RUNCHAR) {
INBYTE(in_repeat);
if ( in_repeat == 0 ) {
/* Just an escaped RUNCHAR value */
OUTBYTE(RUNCHAR);
} else {
/* Pick up value and output a sequence of it */
in_byte = out_data[-1];
while ( --in_repeat > 0 )
OUTBYTE(in_byte);
}
} else {
/* Normal byte */
OUTBYTE(in_byte);
}
}
_PyString_Resize(&rv, (out_data -
(unsigned char *)PyString_AsString(rv)));
return rv;
}
PyDoc_STRVAR(doc_crc_hqx,
"(data, oldcrc) -> newcrc. Compute hqx CRC incrementally");
static PyObject *
binascii_crc_hqx(PyObject *self, PyObject *args)
{
unsigned char *bin_data;
unsigned int crc;
int len;
if ( !PyArg_ParseTuple(args, "s#i:crc_hqx", &bin_data, &len, &crc) )
return NULL;
while(len-- > 0) {
crc=((crc<<8)&0xff00)^crctab_hqx[((crc>>8)&0xff)^*bin_data++];
}
return Py_BuildValue("i", crc);
}
PyDoc_STRVAR(doc_crc32,
"(data, oldcrc = 0) -> newcrc. Compute CRC-32 incrementally");
/* Crc - 32 BIT ANSI X3.66 CRC checksum files
Also known as: ISO 3307
**********************************************************************|
* *|
* Demonstration program to compute the 32-bit CRC used as the frame *|
* check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71 *|
* and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level *|
* protocol). The 32-bit FCS was added via the Federal Register, *|
* 1 June 1982, p.23798. I presume but don't know for certain that *|
* this polynomial is or will be included in CCITT V.41, which *|
* defines the 16-bit CRC (often called CRC-CCITT) polynomial. FIPS *|
* PUB 78 says that the 32-bit FCS reduces otherwise undetected *|
* errors by a factor of 10^-5 over 16-bit FCS. *|
* *|
**********************************************************************|
Copyright (C) 1986 Gary S. Brown. You may use this program, or
code or tables extracted from it, as desired without restriction.
First, the polynomial itself and its table of feedback terms. The
polynomial is
X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
Note that we take it "backwards" and put the highest-order term in
the lowest-order bit. The X^32 term is "implied"; the LSB is the
X^31 term, etc. The X^0 term (usually shown as "+1") results in
the MSB being 1.
Note that the usual hardware shift register implementation, which
is what we're using (we're merely optimizing it by doing eight-bit
chunks at a time) shifts bits into the lowest-order term. In our
implementation, that means shifting towards the right. Why do we
do it this way? Because the calculated CRC must be transmitted in
order from highest-order term to lowest-order term. UARTs transmit
characters in order from LSB to MSB. By storing the CRC this way,
we hand it to the UART in the order low-byte to high-byte; the UART
sends each low-bit to hight-bit; and the result is transmission bit
by bit from highest- to lowest-order term without requiring any bit
shuffling on our part. Reception works similarly.
The feedback terms table consists of 256, 32-bit entries. Notes:
1. The table can be generated at runtime if desired; code to do so
is shown later. It might not be obvious, but the feedback
terms simply represent the results of eight shift/xor opera-
tions for all combinations of data and CRC register values.
2. The CRC accumulation logic is the same for all CRC polynomials,
be they sixteen or thirty-two bits wide. You simply choose the
appropriate table. Alternatively, because the table can be
generated at runtime, you can start by generating the table for
the polynomial in question and use exactly the same "updcrc",
if your application needn't simultaneously handle two CRC
polynomials. (Note, however, that XMODEM is strange.)
3. For 16-bit CRCs, the table entries need be only 16 bits wide;
of course, 32-bit entries work OK if the high 16 bits are zero.
4. The values must be right-shifted by eight bits by the "updcrc"
logic; the shift must be unsigned (bring in zeroes). On some
hardware you could probably optimize the shift in assembler by
using byte-swap instructions.
********************************************************************/
static unsigned long crc_32_tab[256] = {
0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL,
0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL,
0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL,
0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL,
0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL,
0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL,
0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL,
0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL,
0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL,
0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL,
0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL,
0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL,
0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL,
0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL,
0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL,
0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL,
0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL,
0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL,
0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL,
0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL,
0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL,
0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL,
0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL,
0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL,
0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL,
0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL,
0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL,
0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL,
0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL,
0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL,
0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL,
0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL,
0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL,
0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL,
0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL,
0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL,
0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL,
0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL,
0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL,
0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL,
0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL,
0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL,
0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL,
0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL,
0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL,
0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL,
0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL,
0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL,
0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL,
0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL,
0x2d02ef8dUL
};
static PyObject *
binascii_crc32(PyObject *self, PyObject *args)
{ /* By Jim Ahlstrom; All rights transferred to CNRI */
unsigned char *bin_data;
unsigned long crc = 0UL; /* initial value of CRC */
int len;
long result;
if ( !PyArg_ParseTuple(args, "s#|l:crc32", &bin_data, &len, &crc) )
return NULL;
crc = ~ crc;
#if SIZEOF_LONG > 4
/* only want the trailing 32 bits */
crc &= 0xFFFFFFFFUL;
#endif
while (len-- > 0)
crc = crc_32_tab[(crc ^ *bin_data++) & 0xffUL] ^ (crc >> 8);
/* Note: (crc >> 8) MUST zero fill on left */
result = (long)(crc ^ 0xFFFFFFFFUL);
#if SIZEOF_LONG > 4
/* Extend the sign bit. This is one way to ensure the result is the
* same across platforms. The other way would be to return an
* unbounded unsigned long, but the evidence suggests that lots of
* code outside this treats the result as if it were a signed 4-byte
* integer.
*/
result |= -(result & (1L << 31));
#endif
return PyInt_FromLong(result);
}
static PyObject *
binascii_hexlify(PyObject *self, PyObject *args)
{
char* argbuf;
int arglen;
PyObject *retval;
char* retbuf;
int i, j;
if (!PyArg_ParseTuple(args, "s#:b2a_hex", &argbuf, &arglen))
return NULL;
assert(arglen >= 0);
if (arglen > INT_MAX / 2)
return PyErr_NoMemory();
retval = PyString_FromStringAndSize(NULL, arglen*2);
if (!retval)
return NULL;
retbuf = PyString_AsString(retval);
if (!retbuf)
goto finally;
/* make hex version of string, taken from shamodule.c */
for (i=j=0; i < arglen; i++) {
char c;
c = (argbuf[i] >> 4) & 0xf;
c = (c>9) ? c+'a'-10 : c + '0';
retbuf[j++] = c;
c = argbuf[i] & 0xf;
c = (c>9) ? c+'a'-10 : c + '0';
retbuf[j++] = c;
}
return retval;
finally:
Py_DECREF(retval);
return NULL;
}
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)
{
char* argbuf;
int arglen;
PyObject *retval;
char* retbuf;
int i, j;
if (!PyArg_ParseTuple(args, "s#:a2b_hex", &argbuf, &arglen))
return NULL;
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) {
PyErr_SetString(PyExc_TypeError, "Odd-length string");
return NULL;
}
retval = PyString_FromStringAndSize(NULL, (arglen/2));
if (!retval)
return NULL;
retbuf = PyString_AsString(retval);
if (!retbuf)
goto finally;
for (i=j=0; i < arglen; i += 2) {
int top = to_int(Py_CHARMASK(argbuf[i]));
int bot = to_int(Py_CHARMASK(argbuf[i+1]));
if (top == -1 || bot == -1) {
PyErr_SetString(PyExc_TypeError,
"Non-hexadecimal digit found");
goto finally;
}
retbuf[j++] = (top << 4) + bot;
}
return retval;
finally:
Py_DECREF(retval);
return NULL;
}
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)
{
unsigned int in, out;
char ch;
unsigned char *data, *odata;
unsigned int datalen = 0;
PyObject *rv;
static char *kwlist[] = {"data", "header", NULL};
int header = 0;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|i", kwlist, &data,
&datalen, &header))
return NULL;
/* We allocate the output same size as input, this is overkill.
* 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) {
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') ||
(data[in] == ' ') || (data[in] == '\t')) {
if (data[in] != '\n') {
while (in < datalen && data[in] != '\n') in++;
}
if (in < datalen) in++;
}
else if (data[in] == '=') {
/* broken case from broken python qp */
odata[out++] = '=';
in++;
}
else if (((data[in] >= 'A' && data[in] <= 'F') ||
(data[in] >= 'a' && data[in] <= 'f') ||
(data[in] >= '0' && data[in] <= '9')) &&
((data[in+1] >= 'A' && data[in+1] <= 'F') ||
(data[in+1] >= 'a' && data[in+1] <= 'f') ||
(data[in+1] >= '0' && data[in+1] <= '9'))) {
/* hexval */
ch = hexval(data[in]) << 4;
in++;
ch |= hexval(data[in]);
in++;
odata[out++] = ch;
}
else {
odata[out++] = '=';
}
}
else if (header && data[in] == '_') {
odata[out++] = ' ';
in++;
}
else {
odata[out] = data[in];
in++;
out++;
}
}
if ((rv = PyString_FromStringAndSize((char *)odata, out)) == NULL) {
PyMem_Free(odata);
return NULL;
}
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)
{
unsigned int in, out;
unsigned char *data, *odata;
unsigned int datalen = 0, odatalen = 0;
PyObject *rv;
unsigned int linelen = 0;
static char *kwlist[] = {"data", "quotetabs", "istext", "header", NULL};
int istext = 1;
int quotetabs = 0;
int header = 0;
unsigned char ch;
int crlf = 0;
unsigned char *p;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|iii", kwlist, &data,
&datalen, &quotetabs, &istext, &header))
return NULL;
/* See if this string is using CRLF line ends */
/* XXX: this function has the side effect of converting all of
* the end of lines to be the same depending on this detection
* here */
p = (unsigned char *) strchr((char *)data, '\n');
if ((p != NULL) && (p > data) && (*(p-1) == '\r'))
crlf = 1;
/* First, scan to see how many characters need to be encoded */
in = 0;
while (in < datalen) {
if ((data[in] > 126) ||
(data[in] == '=') ||
(header && data[in] == '_') ||
((data[in] == '.') && (linelen == 1)) ||
(!istext && ((data[in] == '\r') || (data[in] == '\n'))) ||
((data[in] == '\t' || data[in] == ' ') && (in + 1 == datalen)) ||
((data[in] < 33) &&
(data[in] != '\r') && (data[in] != '\n') &&
(quotetabs && ((data[in] != '\t') || (data[in] != ' ')))))
{
if ((linelen + 3) >= MAXLINESIZE) {
linelen = 0;
if (crlf)
odatalen += 3;
else
odatalen += 2;
}
linelen += 3;
odatalen += 3;
in++;
}
else {
if (istext &&
((data[in] == '\n') ||
((in+1 < datalen) && (data[in] == '\r') &&
(data[in+1] == '\n'))))
{
linelen = 0;
/* Protect against whitespace on end of line */
if (in && ((data[in-1] == ' ') || (data[in-1] == '\t')))
odatalen += 2;
if (crlf)
odatalen += 2;
else
odatalen += 1;
if (data[in] == '\r')
in += 2;
else
in++;
}
else {
if ((in + 1 != datalen) &&
(data[in+1] != '\n') &&
(linelen + 1) >= MAXLINESIZE) {
linelen = 0;
if (crlf)
odatalen += 3;
else
odatalen += 2;
}
linelen++;
odatalen++;
in++;
}
}
}
/* 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) {
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 == 1)) ||
(!istext && ((data[in] == '\r') || (data[in] == '\n'))) ||
((data[in] == '\t' || data[in] == ' ') && (in + 1 == datalen)) ||
((data[in] < 33) &&
(data[in] != '\r') && (data[in] != '\n') &&
(quotetabs && ((data[in] != '\t') || (data[in] != ' ')))))
{
if ((linelen + 3 )>= MAXLINESIZE) {
odata[out++] = '=';
if (crlf) odata[out++] = '\r';
odata[out++] = '\n';
linelen = 0;
}
odata[out++] = '=';
to_hex(data[in], &odata[out]);
out += 2;
in++;
linelen += 3;
}
else {
if (istext &&
((data[in] == '\n') ||
((in+1 < datalen) && (data[in] == '\r') &&
(data[in+1] == '\n'))))
{
linelen = 0;
/* Protect against whitespace on end of line */
if (out && ((odata[out-1] == ' ') || (odata[out-1] == '\t'))) {
ch = odata[out-1];
odata[out-1] = '=';
to_hex(ch, &odata[out]);
out += 2;
}
if (crlf) odata[out++] = '\r';
odata[out++] = '\n';
if (data[in] == '\r')
in += 2;
else
in++;
}
else {
if ((in + 1 != datalen) &&
(data[in+1] != '\n') &&
(linelen + 1) >= MAXLINESIZE) {
odata[out++] = '=';
if (crlf) odata[out++] = '\r';
odata[out++] = '\n';
linelen = 0;
}
linelen++;
if (header && data[in] == ' ') {
odata[out++] = '_';
in++;
}
else {
odata[out++] = data[in++];
}
}
}
}
if ((rv = PyString_FromStringAndSize((char *)odata, out)) == NULL) {
PyMem_Free(odata);
return NULL;
}
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);
}