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
|
/* -*- c -*- */
/* gzip.xs
*
* Copyright (C) 2001, 2002, Nicholas Clark
*
* You may distribute this work under the terms of either the GNU General
* Public License or the Artistic License, as specified in perl's README
* file.
*
*/
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include <zlib.h>
#include "perliol.h"
/* auto|gzip|none
lazy
csum
name=
extra=
comment=
*/
/* stick a buffer on layer below
turn of crlf
zalloc in the zs struct being non-NULL is sign that we need to tidy up
*/
#define GZIP_HEADERSIZE 10
#define GZIP_TEXTFLAG 0x01
#define GZIP_HAS_HEADERCRC 0x02
#define GZIP_HAS_EXTRAFIELD 0x04
#define GZIP_HAS_ORIGNAME 0x08
#define GZIP_HAS_COMMENT 0x10
/* 0x20 is encrypted, which we'll treat as if its unknown. */
#define GZIP_KNOWNFLAGS 0x1F
#define LAYERGZIP_STATUS_NORMAL 0
#define LAYERGZIP_STATUS_INPUT_EOF 1
#define LAYERGZIP_STATUS_ZSTREAM_END 2
#define LAYERGZIP_STATUS_CONFUSED 3
#define LAYERGZIP_STATUS_1ST_DO_HEADER 4
#define LAYERGZIP_FLAG_GZIPHEADER 0x00
#define LAYERGZIP_FLAG_NOGZIPHEADER 0x01 /* No gzip file header */
#define LAYERGZIP_FLAG_MAYBEGZIPHEADER 0x02 /* Look for magic number */
#define LAYERGZIP_FLAG_AUTOPOP 0x03
#define LAYERGZIP_FLAG_READMODEMASK 0x03
#define LAYERGZIP_FLAG_LAZY 0x04 /* defer header check */
#define LAYERGZIP_FLAG_OURBUFFERBELOW 0x08 /* We own the buffer below us */
#define LAYERGZIP_FLAG_INFL_INIT_DONE 0x10 /* Done inflate init */
#define LAYERGZIP_FLAG_DO_CRC_AT_END 0x20 /* Check CRC at Z_STREAM_END */
#define LAYERGZIP_FLAG_DEFL_INIT_DONE 0x40 /* Done deflate init */
#define LAYERGZIP_FLAG_NO_TIMESTAMP 0x80
#define LAYERGZIP_FLAG_CLOSING_FILE 0x100
#define LAYERGZIP_GZIPHEADER_GOOD 0
#define LAYERGZIP_GZIPHEADER_ERROR 1
#define LAYERGZIP_GZIPHEADER_BADMAGIC 2
#define LAYERGZIP_GZIPHEADER_BADMETHOD 3
#define LAYERGZIP_GZIPHEADER_NOTGZIP 4 /* BEWARE. If you get this your
buf pointer is now invalid */
#ifndef LAYERGZIP_DEFAULT_OS_TYPE
#define LAYERGZIP_DEFAULT_OS_TYPE 255 /* "Unknown" - see rfc1952 */
#endif
#define OUTSIZE 4096
#define LAYERGZIP_DEF_MEM_LEVEL 8
typedef struct {
PerlIOBuf base;
z_stream zs; /* zlib's struct. */
int status; /* state of the inflater */
int flags; /* bitmap */
unsigned long crc; /* ongoing CRC of data */
long time; /* timestamp to write to the header */
Bytef *outbuf; /* Our malloc'd output buffer */
int level; /* compression level for deflate */
unsigned char os_type; /* OS type flag for the header */
} PerlIOGzip;
/*****************************************************************************
*
* Reading stuff
*
*****************************************************************************/
/* Logic of the header passer:
buffer is where we're reading from. It may point into the fast_gets buffer
of the layer below, or into our private SV.
We start, if possible in the fast_gets buffer. When we exhaust it (or if
we can't use it) we allocate a private SV and store everything that we've
read into it. */
static SSize_t
get_more (PerlIO *below, SSize_t wanted, SV **sv, unsigned char **buffer) {
dTHX; /* fetch context */
SSize_t get, done, read;
unsigned char *read_here;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip get_more f=%p wanted=%08"UVxf" sv=%p buffer=%p\n",
below, wanted, *sv, *buffer);
#endif
if (!*sv) {
/* We know there were not enough bytes available in the layer below's
buffer. We know that we started at the beginning of it, so we can
calculate how many bytes we've passed over (but not consumed, as we
didn't alter the pointer and count). */
done = *buffer - (unsigned char*) PerlIO_get_ptr(below);
get = done + wanted; /* Need to read the lot into our SV. */
*sv = newSVpvn("", 0);
if (!*sv)
return -1;
read_here = (unsigned char *) SvGROW(*sv, get);
*buffer = read_here + done;
} else {
done = SvCUR(*sv);
read_here = *buffer = (unsigned char *) SvGROW(*sv, done + wanted) + done;
get = wanted; /* Only need to read the next section */
}
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip get_more sv=%p buffer=%p done=%08"UVxf" read_here=%p get=%08"UVxf" \n", *sv, *buffer, done, read_here, get);
#endif
read = PerlIO_read (below, read_here, wanted);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip get_more read=%08"UVxf"\n", read);
#endif
if (read == -1) {
/* Read error. Messy. Don't know what state our buffer is, and whether we
should unread it. Probably not. */
SvREFCNT_dec(*sv);
*sv = NULL;
return read;
}
if (read_here == *buffer) {
/* We were appending. */
SvCUR(*sv) += read;
return read;
}
/* We were reading into the whole buffer. */
SvCUR_set(*sv, read);
return read - done;
}
static SSize_t
eat_nul (PerlIO *below, SV **sv, unsigned char **buffer) {
dTHX; /* fetch context */
SSize_t munch_size = 256; /* Pick a size to read in. Should this double
each loop? */
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip eat_nul f=%p sv=%p buffer=%p\n",
below, *sv, *buffer);
#endif
if (!*sv) {
/* Buffer below supposed fast_gets. */
unsigned char *end
= (unsigned char *) PerlIO_get_base(below) + PerlIO_get_bufsiz(below);
unsigned char *here = *buffer;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip eat_nul here=%p end=%p\n", here, end);
#endif
while (here < end) {
if (*here++)
continue;
*buffer = here;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip eat_nul found it! here=%p end=%p, returning %08"
UVxf"\n", here, end, (UV) (end-here));
#endif
return end-here;
}
*buffer = here;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip eat_nul no joy here=%p end=%p\n", here, end);
#endif
}
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip eat_nul about to loop\n");
#endif
while (1) {
unsigned char *end, *here;
SSize_t avail = get_more (below, munch_size, sv, buffer);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip eat_nul sv=%p buffer=%p wanted=%08"UVxf" avail=%08"UVxf"\n",
*sv, *buffer, munch_size, (UV)avail);
#endif
if (avail == -1 || avail == 0)
return -1;
end = (unsigned char *)SvEND(*sv);
here = *buffer;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip eat_nul here=%p end=%p\n", here, end);
#endif
while (here < end) {
if (*here++)
continue;
*buffer = here;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip eat_nul found it! here=%p end=%p, returning %08"
UVxf"\n", here, end, (UV) (end-here));
#endif
return end-here;
}
/* as *sv is not NULL, get_more doesn't use the input value of *buffer,
so don't waste time setting it. We've eaten the whole SV - that's
all get_more cares about. So loop and munch some more. */
}
}
/* gzip header is
Magic number 0,1
Compression type 2
Flags 3
Time 4-7
XFlags 8
OS Code 9
*/
static int
check_gzip_header (PerlIO *f) {
dTHX; /* fetch context */
PerlIO *below = PerlIONext(f);
int code = LAYERGZIP_GZIPHEADER_GOOD;
SSize_t avail;
SV *temp = NULL;
unsigned char *header;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header f=%p below=%p fast_gets=%d\n",
f, below, PerlIO_fast_gets(below));
#endif
if (PerlIO_fast_gets(below)) {
avail = PerlIO_get_cnt(below);
if (avail <= 0) {
avail = PerlIO_fill(below);
if (avail == 0)
avail = PerlIO_get_cnt(below);
else
avail = 0;
}
} else
avail = 0;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header avail=%08"UVxf"\n", (UV)avail);
#endif
if (avail >= GZIP_HEADERSIZE)
header = (unsigned char *) PerlIO_get_ptr(below);
else {
temp = newSVpvn("", 0);
if (!temp)
return LAYERGZIP_GZIPHEADER_ERROR;
header = (unsigned char *) SvGROW(temp, GZIP_HEADERSIZE);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header below=%p header=%p size %d\n",
below, header, GZIP_HEADERSIZE);
#endif
avail = PerlIO_read(below,header,GZIP_HEADERSIZE);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header read=%08"UVxf"\n", (UV)avail);
#endif
SvCUR_set(temp, avail);
if (avail < 0) {
code = LAYERGZIP_GZIPHEADER_ERROR;
goto bad;
} else if (avail < 2 ) {
code = LAYERGZIP_GZIPHEADER_BADMAGIC;
goto bad;
} else if (avail < GZIP_HEADERSIZE) {
/* Too short, but if magic number isn't there, it's not a gzip file */
if (header[0] == 0x1f && header[1] == 0x8b) {
/* It's trying to be a gzip file. */
code = LAYERGZIP_GZIPHEADER_ERROR;
} else
code = LAYERGZIP_GZIPHEADER_BADMAGIC;
goto bad;
}
}
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header header=%p\n", header);
#endif
avail -= GZIP_HEADERSIZE;
if (header[0] != 0x1f || header[1] != 0x8b)
code = LAYERGZIP_GZIPHEADER_BADMAGIC;
else if (header[2] != Z_DEFLATED)
code = LAYERGZIP_GZIPHEADER_BADMETHOD;
else if (header[3] & !GZIP_KNOWNFLAGS)
code = LAYERGZIP_GZIPHEADER_ERROR;
else { /* Check the header, and skip any extra fields */
int flags = header[3];
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header flags=%02X\n", flags);
#endif
header += GZIP_HEADERSIZE;
if (flags & GZIP_HAS_EXTRAFIELD) {
Size_t len;
if (avail < 2) {
/* Need some more */
avail = get_more (below, 2, &temp, &header);
if (avail < 2) {
code = LAYERGZIP_GZIPHEADER_ERROR;
goto bad;
}
}
/* 2 byte little endian quantity, which we now know is in the buffer. */
len = header[0] | (header[1] << 8);
header += 2;
avail -= 2;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header header=%p avail=%08"UVxf
" extra len=%d\n", header, (UV)avail, (int)len);
#endif
if (avail < len) {
/* Need some more */
avail = get_more (below, len, &temp, &header);
if (avail < len) {
code = LAYERGZIP_GZIPHEADER_ERROR;
goto bad;
}
}
header += len;
avail -= len;
}
if (flags & GZIP_HAS_ORIGNAME) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header header=%p avail=%08"UVxf
" has origname\n", header, (UV)avail);
#endif
avail = eat_nul (below, &temp, &header);
if (avail < 0) {
code = LAYERGZIP_GZIPHEADER_ERROR;
goto bad;
}
}
if (flags & GZIP_HAS_COMMENT) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header header=%p avail=%08"UVxf
" has comment\n", header, (UV)avail);
#endif
avail = eat_nul (below, &temp, &header);
if (avail < 0) {
code = LAYERGZIP_GZIPHEADER_ERROR;
goto bad;
}
}
if (flags & GZIP_HAS_HEADERCRC) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header header=%p avail=%08"UVxf
" has header CRC\n", header, (UV)avail);
#endif
if (avail < 2) {
/* Need some more */
avail = get_more (below, 2, &temp, &header);
if (avail < 2) {
code = LAYERGZIP_GZIPHEADER_ERROR;
goto bad;
}
}
header += 2;
avail -= 2;
}
}
if (code == LAYERGZIP_GZIPHEADER_GOOD) {
/* Adjust the pointer here. or free the SV */
if (temp) {
SSize_t unread;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header finished. unreading header=%p "
"avail=%08"UVxf"\n", header, (UV)avail);
#endif
if (avail) {
if (!(PerlIOBase(below)->flags & PERLIO_F_FASTGETS)) {
#if DEBUG_LAYERGZIP
PerlIO_debug("check_gzip_header HACK around core PerlIO bug\n");
#endif
if (!PerlIO_push(aTHX_ below,&PerlIO_perlio,"r",&PL_sv_undef)) {
#if DEBUG_LAYERGZIP
PerlIO_debug("check_gzip_header failed to push new layer\n");
#endif
code = LAYERGZIP_GZIPHEADER_ERROR;
goto bad;
}
PerlIOSelf(f,PerlIOGzip)->flags |= LAYERGZIP_FLAG_OURBUFFERBELOW;
below = PerlIONext(f);
}
unread = PerlIO_unread (below, header, avail);
if (unread != avail) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header finished. only unread %08"UVxf"\n", unread);
#endif
code = LAYERGZIP_GZIPHEADER_ERROR;
}
}
SvREFCNT_dec(temp);
} else {
PerlIO_debug("PerlIOGzip check_gzip_header finished. setting ptrcnt "
"header=%p avail=%08"UVxf"\n", header, (UV)avail);
PerlIO_set_ptrcnt(below, (STDCHAR *) header, avail);
}
} else {
/* Unread the whole the SV. Maybe I should try to seek first. */
bad:
if (temp) {
STRLEN len;
STDCHAR *ptr = SvPV(temp, len);
PerlIOGzip *g = PerlIOSelf(f,PerlIOGzip);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header failed. unreading ptr=%p len=%08"UVxf"\n", ptr, (UV)len);
#endif
if (((g->flags & LAYERGZIP_FLAG_READMODEMASK)
== LAYERGZIP_FLAG_MAYBEGZIPHEADER)
&& !(PerlIOBase(below)->flags & PERLIO_F_FASTGETS)) {
#if DEBUG_LAYERGZIP
PerlIO_debug("check_gzip_header HACK around core PerlIO bug\n");
#endif
if (PerlIO_push(aTHX_ below,&PerlIO_perlio,"r",&PL_sv_undef)) {
g->flags |= LAYERGZIP_FLAG_OURBUFFERBELOW;
below = PerlIONext(f);
} else {
#if DEBUG_LAYERGZIP
PerlIO_debug("check_gzip_header failed to push new layer\n");
#endif
}
}
PerlIO_unread (below, ptr, len);
SvREFCNT_dec(temp);
}
if (code != LAYERGZIP_GZIPHEADER_BADMAGIC)
PerlIOBase(f)->flags |= PERLIO_F_ERROR;
}
return code;
}
static int
check_gzip_header_and_init (PerlIO *f) {
dTHX; /* fetch context */
PerlIOGzip *g = PerlIOSelf(f,PerlIOGzip);
int code;
z_stream *z = &g->zs;
PerlIO *below = PerlIONext(f);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header_and_init f=%p below=%p flags=%02X\n",
f, below, g->flags);
#endif
if ((g->flags & LAYERGZIP_FLAG_READMODEMASK) != LAYERGZIP_FLAG_NOGZIPHEADER) {
g->flags |= LAYERGZIP_FLAG_DO_CRC_AT_END;
code = check_gzip_header (f);
if (code != LAYERGZIP_GZIPHEADER_GOOD) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip check_gzip_header_and_init code=%d\n", code);
#endif
if (code != LAYERGZIP_GZIPHEADER_BADMAGIC)
return code;
else {
int mode = g->flags & LAYERGZIP_FLAG_READMODEMASK;
if (mode == LAYERGZIP_FLAG_MAYBEGZIPHEADER) {
/* There wasn't a magic number. But flags say that's OK.
And we won't be checking the CRC at the end */
g->flags &= ~LAYERGZIP_FLAG_DO_CRC_AT_END;
} else if (mode == LAYERGZIP_FLAG_AUTOPOP) {
/* There wasn't a magic number. Muahahaha. Treat it as a normal
file by popping ourself. */
return LAYERGZIP_GZIPHEADER_NOTGZIP;
} else {
return code;
}
}
}
}
g->status = LAYERGZIP_STATUS_NORMAL;
/* (any header validated) */
if (PerlIOBase(below)->flags & PERLIO_F_FASTGETS) {
#if DEBUG_LAYERGZIP
PerlIO_debug("check_gzip_header_and_init :-). f=%p %s fl=%08X\n",
below, PerlIOBase(below)->tab->name,
(int)PerlIOBase(below)->flags);
#endif
} else {
/* Bah. Layer below us doesn't support FASTGETS. So we need to add a layer
to provide our input buffer. */
#if DEBUG_LAYERGZIP
PerlIO_debug("check_gzip_header_and_init :-(. f=%p %s fl=%08X\n",
below, PerlIOBase(below)->tab->name,
(int) PerlIOBase(below)->flags);
#endif
if (!PerlIO_push(aTHX_ below,&PerlIO_perlio,"r",&PL_sv_undef))
return LAYERGZIP_GZIPHEADER_ERROR;
g->flags |= LAYERGZIP_FLAG_OURBUFFERBELOW;
below = PerlIONext(f);
}
assert (PerlIO_fast_gets(below));
z->next_in = (Bytef *) PerlIO_get_base(below);
z->avail_in = z->avail_out = 0;
z->zalloc = (alloc_func) 0;
z->zfree = (free_func) 0;
z->opaque = 0;
/* zlib docs say that next_out and avail_out are unchanged by init.
Implication is that they don't yet need to be initialised. */
if (inflateInit2(z, -MAX_WBITS) != Z_OK) {
#if DEBUG_LAYERGZIP
PerlIO_debug("check_gzip_header_and_init failed to inflateInit2");
#endif
if (g->flags & LAYERGZIP_FLAG_OURBUFFERBELOW) {
g->flags &= ~LAYERGZIP_FLAG_OURBUFFERBELOW;
PerlIO_pop(aTHX_ below);
}
return LAYERGZIP_GZIPHEADER_ERROR;
}
g->flags |= LAYERGZIP_FLAG_INFL_INIT_DONE;
if (g->flags & LAYERGZIP_FLAG_DO_CRC_AT_END)
g->crc = crc32(0L, Z_NULL, 0);
return LAYERGZIP_GZIPHEADER_GOOD;
}
/*****************************************************************************
*
* Writing stuff
*
*****************************************************************************/
static int
write_gzip_header (PerlIO *f) {
dTHX; /* fetch context */
PerlIOGzip *g = PerlIOSelf(f,PerlIOGzip);
char header[10];
unsigned long timestamp = 0;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip write_gzip_header f=%p flags=%02X\n", f, g->flags);
#endif
header[0] = 0x1f; header[1] = 0x8b;
header[2] = Z_DEFLATED;
header[3] = 0; /* TEXT, CRC, EXTRA, NAME, COMMENT */
if (!(g->flags & LAYERGZIP_FLAG_NO_TIMESTAMP)) {
timestamp = g->time;
if (timestamp == 0) {
/* time_t is signed, I want unsigned for my shifting below */
time_t now = time(NULL);
timestamp = (now == -1) ? 0 : now;
}
}
/* All quantities are little endian. */
header[4] = timestamp & 0xFF;
header[5] = (timestamp >> 8) & 0xFF;
header[6] = (timestamp >> 16) & 0xFF;
header[7] = (timestamp >> 24) & 0xFF;
header[8] = 0; /* XFlags can be zero. */
header[9] = g->os_type;
if (PerlIO_write(PerlIONext(f), header, sizeof(header)) != sizeof(header))
return -1;
return 0;
}
static int
write_gzip_header_and_init (PerlIO *f) {
dTHX; /* fetch context */
PerlIOGzip *g = PerlIOSelf(f,PerlIOGzip);
int code;
z_stream *z = &g->zs;
#if DEBUG_LAYERGZIP
PerlIO *below = PerlIONext(f);
PerlIO_debug("PerlIOGzip write_gzip_header_and_init f=%p below=%p flags=%02X\n",
f, below, g->flags);
#endif
if ((g->flags & LAYERGZIP_FLAG_READMODEMASK) != LAYERGZIP_FLAG_NOGZIPHEADER) {
g->flags |= LAYERGZIP_FLAG_DO_CRC_AT_END;
code = write_gzip_header (f);
if (code) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip write_gzip_header_and_init code=%d\n", code);
#endif
return code;
}
}
g->status = LAYERGZIP_STATUS_NORMAL;
Renew(g->outbuf, OUTSIZE, Bytef);
z->next_in = (Bytef *) NULL;
z->avail_in = 0;
z->next_out = (Bytef *) g->outbuf;
z->avail_out = OUTSIZE;
z->zalloc = (alloc_func) 0;
z->zfree = (free_func) 0;
z->opaque = 0;
/* zlib docs say that next_out and avail_out are unchanged by init.
Implication is that they don't yet need to be initialised. */
if (deflateInit2(z, g->level, Z_DEFLATED, -MAX_WBITS,
LAYERGZIP_DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY) != Z_OK) {
#if DEBUG_LAYERGZIP
PerlIO_debug("write_gzip_header_and_init failed to deflateInit2");
#endif
return LAYERGZIP_GZIPHEADER_ERROR;
}
g->flags |= LAYERGZIP_FLAG_DEFL_INIT_DONE;
if (g->flags & LAYERGZIP_FLAG_DO_CRC_AT_END)
g->crc = crc32(0L, Z_NULL, 0);
return LAYERGZIP_GZIPHEADER_GOOD;
}
/*****************************************************************************
*
* Methods
*
*****************************************************************************/
static SV *
PerlIOGzip_getarg(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
{
PerlIOGzip *g = PerlIOSelf(f,PerlIOGzip);
SV *sv;
register const char *mode;
switch (g->flags & LAYERGZIP_FLAG_READMODEMASK) {
case LAYERGZIP_FLAG_GZIPHEADER:
if (!(g->flags & LAYERGZIP_FLAG_AUTOPOP)) {
/* Default */
sv = newSVpvn("",0);
return sv ? sv : &PL_sv_undef;
}
mode = "gzip";
break;
case LAYERGZIP_FLAG_NOGZIPHEADER:
mode = "none";
break;
case LAYERGZIP_FLAG_MAYBEGZIPHEADER:
mode = "auto";
break;
case LAYERGZIP_FLAG_LAZY:
mode = "lazy";
break;
}
sv = newSVpv (mode, 4);
if (!sv)
return &PL_sv_undef;
if (g->flags & LAYERGZIP_FLAG_AUTOPOP)
sv_catpv (sv, ",autopop");
return sv;
}
PerlIO_funcs PerlIO_gzip;
static IV
PerlIOGzip_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
{
PerlIOGzip *g = PerlIOSelf(f,PerlIOGzip);
IV code = 0;
STRLEN len;
const char *argstr;
if (arg && SvOK(arg))
argstr = SvPV(arg, len);
else {
argstr = NULL;
len = 0;
}
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_pushed f=%p %s %s fl=%08"UVxf" g=%p\n",
f,PerlIOBase(f)->tab->name,(mode) ? mode : "(Null)",
PerlIOBase(f)->flags, g);
if (argstr)
PerlIO_debug(" len=%d argstr=%.*s\n", (int)len, (int)len, argstr);
#endif
code = PerlIOBuf_pushed(aTHX_ f,mode,&PL_sv_undef,&PerlIO_gzip);
if (code)
return code;
g->flags = LAYERGZIP_FLAG_GZIPHEADER;
g->status = LAYERGZIP_STATUS_1ST_DO_HEADER;
g->outbuf = NULL;
g->level = Z_DEFAULT_COMPRESSION;
g->os_type = LAYERGZIP_DEFAULT_OS_TYPE;
if (len) {
const char *end = argstr + len;
while (1) {
int arg_bad = 0;
const char *comma = memchr (argstr, ',', end - argstr);
STRLEN this_len = comma ? (comma - argstr) : (end - argstr);
#if DEBUG_LAYERGZIP
PerlIO_debug(" processing len=%d argstr=%.*s\n",
(int)this_len, (int)this_len, argstr);
#endif
if (this_len == 4) {
if (memEQ (argstr, "none", 4)) {
g->flags &= ~LAYERGZIP_FLAG_READMODEMASK;
g->flags |= LAYERGZIP_FLAG_NOGZIPHEADER;
} else if (memEQ (argstr, "auto", 4)) {
g->flags &= ~LAYERGZIP_FLAG_READMODEMASK;
g->flags |= LAYERGZIP_FLAG_MAYBEGZIPHEADER;
} else if (memEQ (argstr, "lazy", 4)) {
g->flags &= ~LAYERGZIP_FLAG_READMODEMASK;
g->flags |= LAYERGZIP_FLAG_LAZY;
} else if (memEQ (argstr, "gzip", 4)) {
g->flags &= ~LAYERGZIP_FLAG_READMODEMASK;
g->flags |= LAYERGZIP_FLAG_GZIPHEADER;
} else
arg_bad = 1;
} else if (this_len == 7) {
if (memEQ (argstr, "autopop", 7)) {
g->flags &= ~LAYERGZIP_FLAG_READMODEMASK;
g->flags |= LAYERGZIP_FLAG_AUTOPOP;
} else
arg_bad = 1;
}
if (arg_bad) {
dTHX; /* fetch context */
/* XXX This will mangle UTF8 in error messages */
Perl_warn(aTHX_ "perlio: layer :gzip, unrecognised argument \"%.*s\"",
(int)this_len, argstr);
}
if (!comma)
break;
argstr = comma + 1;
}
}
if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_pushed f=%p fl=%08"UVxf" including write (%X)\n",
f, PerlIOBase(f)->flags, PERLIO_F_CANWRITE);
#endif
/* autopop trumps writing. */
if ((g->flags & LAYERGZIP_FLAG_READMODEMASK) == LAYERGZIP_FLAG_AUTOPOP) {
PerlIO_pop(aTHX_ f);
return 0;
} else if ((g->flags & LAYERGZIP_FLAG_READMODEMASK) ==
LAYERGZIP_FLAG_MAYBEGZIPHEADER) {
/* This makes no sense for writing. */
return -1;
}
if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
return -1;
if (!(g->flags & LAYERGZIP_FLAG_LAZY) ||
((g->flags & LAYERGZIP_FLAG_READMODEMASK) ==
LAYERGZIP_FLAG_NOGZIPHEADER)) {
code = write_gzip_header_and_init (f);
if (code != LAYERGZIP_GZIPHEADER_GOOD)
return -1;
}
} else if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
/* autopop trumps lazy. (basically, it's going to confuse upstream far too
much if on the first read we pop our buffered layer off to reveal an
unbuffered layer below us) */
if (!(g->flags & LAYERGZIP_FLAG_LAZY) ||
((g->flags & LAYERGZIP_FLAG_READMODEMASK) == LAYERGZIP_FLAG_AUTOPOP)) {
code = check_gzip_header_and_init (f);
if (code != LAYERGZIP_GZIPHEADER_GOOD) {
if (code == LAYERGZIP_GZIPHEADER_NOTGZIP) {
PerlIO_pop(aTHX_ f);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_pushed just popped f=%p\n", f);
#endif
return 0;
}
return -1;
}
}
} else {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_pushed f=%p fl=%08"UVxf
" neither read nor write\n", f, PerlIOBase(f)->flags);
#endif
return -1;
}
if (g->flags & LAYERGZIP_FLAG_DO_CRC_AT_END)
g->crc = crc32(0L, Z_NULL, 0);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_pushed f=%p g->status=%d g->flags=%02X\n",
f, g->status, g->flags);
#endif
return 0;
}
static IV
PerlIOGzip_popped(pTHX_ PerlIO *f)
{
PerlIOGzip *g = PerlIOSelf(f,PerlIOGzip);
IV code = 0;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_popped f=%p %s flags=%02X\n",
f,PerlIOBase(f)->tab->name, g->flags);
#endif
if (g->flags & LAYERGZIP_FLAG_INFL_INIT_DONE) {
g->flags &= ~LAYERGZIP_FLAG_INFL_INIT_DONE;
code = inflateEnd (&(g->zs)) == Z_OK ? 0 : -1;
}
if (g->flags & LAYERGZIP_FLAG_DEFL_INIT_DONE) {
g->flags &= ~LAYERGZIP_FLAG_DEFL_INIT_DONE;
code = deflateEnd (&(g->zs));
PerlIO_debug("PerlIOGzip_popped code=%"IVdf"\n", code);
code = (code == Z_OK) ? 0 : -1;
}
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_popped code=%d\n", code);
#endif
Safefree (g->outbuf);
g->outbuf = NULL;
if (g->flags & LAYERGZIP_FLAG_OURBUFFERBELOW) {
PerlIO *below = PerlIONext(f);
assert (below); /* This must be a layer, or our flags a screwed, or someone
else has been screwing with our buffer. */
PerlIO_pop(aTHX_ below);
g->flags &= ~LAYERGZIP_FLAG_OURBUFFERBELOW;
}
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_popped f=%p %s %d\n",
f,PerlIOBase(f)->tab->name, (int)code);
#endif
return code;
}
static IV
PerlIOGzip_close(pTHX_ PerlIO *f)
{
IV code = 0;
PerlIOGzip *g = PerlIOSelf(f,PerlIOGzip);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_close f=%p %s za=%p g->status=%d\n",
f,PerlIOBase(f)->tab->name, g->zs.zalloc, (int) g->status);
#endif
/* Signal to anything (eg the flush()) that the sky *is* falling down.
Can't simply move the status to EOF, as status on "1ST_DO_HEADER"
is used by lazy write to mean "write the gzip header on first write"
and there's a real chance (certainly in the regression tests :-))
that we have all the data to compress ready in the buffer with nothing
actually deflated right now at close time. */
g->flags |= LAYERGZIP_FLAG_CLOSING_FILE;
if ((g->flags & LAYERGZIP_FLAG_DEFL_INIT_DONE) ||
(PerlIOBase(f)->flags & PERLIO_F_WRBUF)) {
code = PerlIO_flush(f);
}
if (g->flags & LAYERGZIP_FLAG_DO_CRC_AT_END) {
if ((PerlIOBase(f)->flags & PERLIO_F_CANREAD)
&& (g->status == LAYERGZIP_STATUS_ZSTREAM_END)) {
unsigned char buffer[8];
PerlIO *below = PerlIONext(f);
SSize_t got = PerlIO_read(below,buffer,8);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_close g->crc=%08"UVxf" next=%p got=%d\n",
g->crc, below, (int)got);
#endif
if (got != 8)
code = -1;
else {
U32 crc = buffer[0] | (buffer[1] << 8) | (buffer[2] << 16)
| (buffer[3] << 24);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_close crc=%08"UVxf"\n", crc);
#endif
if (crc != (g->crc & 0xFFFFFFFF))
code = -1;
else {
U32 len = buffer[4] | (buffer[5] << 8) | (buffer[6] << 16)
| (buffer[7] << 24);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_close len=%08"UVxf" total=%08"UVxf"\n",
len, g->zs.total_out);
#endif
if (len != (g->zs.total_out & 0xFFFFFFFF))
code = -1;
}
}
} else if ((PerlIOBase(f)->flags & PERLIO_F_CANWRITE) && (code == 0)) {
/* Don't come in here if the flush failed (ie code != 0). */
unsigned char buffer[8];
PerlIO *below = PerlIONext(f);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_close crc=%08"UVxf" len=%08"UVxf"\n", g->crc,
g->zs.total_in);
#endif
buffer[0] = g->crc & 0xFF;
buffer[1] = (g->crc >> 8) & 0xFF;
buffer[2] = (g->crc >> 16) & 0xFF;
buffer[3] = (g->crc >> 24) & 0xFF;
buffer[4] = g->zs.total_in & 0xFF;
buffer[5] = (g->zs.total_in >> 8) & 0xFF;
buffer[6] = (g->zs.total_in >> 16) & 0xFF;
buffer[7] = (g->zs.total_in >> 24) & 0xFF;
code = (PerlIO_write(below,buffer,8) == 8 ? 0 : -1);
}
}
if (g->flags & (LAYERGZIP_FLAG_DEFL_INIT_DONE | LAYERGZIP_FLAG_INFL_INIT_DONE
| LAYERGZIP_FLAG_OURBUFFERBELOW))
code |= PerlIOGzip_popped(aTHX_ f);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_close f=%p %d\n", f, (int)code);
#endif
#if PERL_VERSION > 8 || PERL_SUBVERSION > 0
/* 5.8.1 correctly exports PerlIOBuf_close */
code |= PerlIOBuf_close(aTHX_ f); /* Call it whatever. */
#else
/* 5.8.0 doesn't, so platforms such as AIX and Windows can't see it.
Inline it here: */
code |= PerlIOBase_close(aTHX_ f);
{
PerlIOBuf *b = PerlIOSelf(f, PerlIOBuf);
if (b->buf && b->buf != (STDCHAR *) & b->oneword) {
Safefree(b->buf);
}
b->buf = NULL;
b->ptr = b->end = b->buf;
PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF | PERLIO_F_WRBUF);
}
#endif
return code ? -1 : 0; /* Only returns 0 if both succeeded */
}
static IV
PerlIOGzip_fill(pTHX_ PerlIO *f)
{
PerlIOGzip *g = PerlIOSelf(f,PerlIOGzip);
PerlIOBuf *b = PerlIOSelf(f,PerlIOBuf);
PerlIO *n = PerlIONext(f);
SSize_t avail;
int status = Z_OK;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_fill f=%p g->status=%d\n", f, g->status);
#endif
if (g->status == LAYERGZIP_STATUS_CONFUSED ||
g->status == LAYERGZIP_STATUS_ZSTREAM_END)
return -1; /* Error state, or EOF has been seen. */
if (g->status == LAYERGZIP_STATUS_1ST_DO_HEADER) {
if (check_gzip_header_and_init (f) != LAYERGZIP_GZIPHEADER_GOOD) {
g->status = LAYERGZIP_STATUS_CONFUSED;
PerlIOBase(f)->flags |= PERLIO_F_ERROR;
return -1;
}
}
if (!b->buf)
PerlIO_get_base(f); /* allocate via vtable */
b->ptr = b->end = b->buf;
g->zs.next_out = (Bytef *) b->buf;
g->zs.avail_out = b->bufsiz;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_fill next_out=%p avail_out=%08x status=%d\n",
g->zs.next_out,g->zs.avail_out, g->status);
#endif
assert (PerlIO_fast_gets(n));
/* loop while we see no output. */
while (g->zs.next_out == (Bytef *) b->buf) {
/* If we have run out of input then read some more. */
avail = PerlIO_get_cnt(n);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_fill avail=%08"UVxf" status=%d\n", (UV)avail,
g->status);
#endif
/* Someone is going to give us compressed input on a tty some day, and
there we'll only see EOF once, before a read will block again.
So if we see EOF, remember it. inflate will stall with an error if
more input were really needed and this EOF turns out to have been
premature. */
if (avail <= 0 && (g->status != LAYERGZIP_STATUS_INPUT_EOF)) {
avail = PerlIO_fill(n);
if (avail == 0) {
avail = PerlIO_get_cnt(n);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_fill refill, avail=%08"UVxf"\n",(UV)avail);
#endif
} else {
/* To make this non blocking friendly would we need to change this? */
if (PerlIO_error(n)) {
/* I'm assuming that the error on the input stream is persistent,
and that as there is going to be output space, I'll get
Z_BUF_ERROR if no progress is possible because I've used all
the input I got before the error. */
avail = 0;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_fill error, avail=%08"UVxf"\n",(UV)avail);
#endif
} else if (PerlIO_eof(n)) {
g->status = LAYERGZIP_STATUS_INPUT_EOF;
avail = 0;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_fill input eof, avail=%08"UVxf"\n",(UV)avail);
#endif
} else {
avail = 0;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_fill how did I get here?, avail=%08"UVxf
"\n",(UV)avail);
#endif
}
}
}
g->zs.avail_in = avail;
g->zs.next_in = (Bytef *) PerlIO_get_ptr(n);
/* Z_SYNC_FLUSH to get as much output as possible if there's no input left.
This may be pointless, but I'm hoping that this is enough to make non-
blocking work by forcing as much output as possible if the input
blocked. */
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_fill preinf next_in=%p avail_in=%08x\n",
g->zs.next_in,g->zs.avail_in);
#endif
status = inflate (&(g->zs), avail ? Z_NO_FLUSH : Z_SYNC_FLUSH);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_fill postinf next_in=%p avail_in=%08x status=%d\n",
g->zs.next_in,g->zs.avail_in, status);
#endif
/* And we trust that zlib gets these two correct */
PerlIO_set_ptrcnt(n, (STDCHAR *) g->zs.next_in, g->zs.avail_in);
if (status != Z_OK) {
if (status == Z_STREAM_END) {
g->status = LAYERGZIP_STATUS_ZSTREAM_END;
PerlIOBase(f)->flags |= PERLIO_F_EOF;
} else {
PerlIOBase(f)->flags |= PERLIO_F_ERROR;
}
break;
}
} /* loop until we read enough data.
hopefully not literally forever. Z_BUF_ERROR should be generated if
there is a buffer problem. Z_OK will only appear if there is progress
- ie either input is consumed (it must be available for this) or output
is generated (there must be space for this). Hence not consuming any
input whilst also not generating any more output is an error we will
spot and barf on. */
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_fill leaving next_out=%p avail_out=%08x\n",
g->zs.next_out,g->zs.avail_out);
#endif
if (g->zs.next_out != (Bytef *) b->buf) {
/* Success if we got at least one byte. :-) */
b->end = (STDCHAR *) g->zs.next_out;
/* Update the crc */
if (g->flags & LAYERGZIP_FLAG_DO_CRC_AT_END)
g->crc = crc32(g->crc, (Bytef *) b->buf, b->end - b->buf);
PerlIOBase(f)->flags |= PERLIO_F_RDBUF;
return 0;
}
return -1;
}
IV
PerlIOGzip_flush(pTHX_ PerlIO *f) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_flush f=%p fl=%08"UVxf"\n", f,
PerlIOBase(f)->flags);
#endif
if (PerlIOBase(f)->flags & PERLIO_F_ERROR)
return -1;
if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
/* Must come in here even if there's no buffered data, in case we need
to finish */
PerlIOGzip *g = PerlIOSelf(f,PerlIOGzip);
PerlIOBuf *b = PerlIOSelf(f,PerlIOBuf);
z_stream *z = &g->zs;
if (g->status == LAYERGZIP_STATUS_1ST_DO_HEADER) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_flush 1st do header b->buf=%p b->ptr=%p\n",
b->buf, b->ptr);
#endif
/* OK. In lazy mode. */
if (b->ptr == b->buf) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_flush no data, write no header\n");
#endif
g->status = LAYERGZIP_STATUS_ZSTREAM_END;
return 0;
}
if (write_gzip_header_and_init (f)) {
g->status = LAYERGZIP_STATUS_CONFUSED;
PerlIOBase(f)->flags |= PERLIO_F_ERROR;
return -1;
}
}
z->next_in = (Bytef *) b->buf;
z->avail_in = b->ptr - b->buf;
if (g->flags & LAYERGZIP_FLAG_DO_CRC_AT_END)
g->crc = crc32(g->crc, z->next_in, z->avail_in);
while (z->avail_in || ((g->flags & LAYERGZIP_FLAG_CLOSING_FILE)
&& g->status == LAYERGZIP_STATUS_NORMAL)) {
int status;
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_flush predef next_in= %p avail_in= %08x\n"
" next_out=%p avail_out=%08x"
"\n", g->zs.next_in, g->zs.avail_in, g->zs.next_out,
g->zs.avail_out);
#endif
status = deflate (&(g->zs), (g->flags & LAYERGZIP_FLAG_CLOSING_FILE)
? Z_FINISH : 0);
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_flush postdef next_in= %p avail_in= %08x\n"
" next_out=%p avail_out=%08x "
"status=%d\n", g->zs.next_in,g->zs.avail_in,
g->zs.next_out,g->zs.avail_out, status);
#endif
if (status == Z_STREAM_END) {
assert (z->avail_in == 0);
g->status = LAYERGZIP_STATUS_ZSTREAM_END;
}
if (status == Z_OK || status == Z_STREAM_END) {
if (z->avail_out == 0 || status == Z_STREAM_END) {
PerlIO *n = PerlIONext(f);
SSize_t avail = OUTSIZE - z->avail_out;
STDCHAR *where = (STDCHAR *) g->outbuf;
while (avail > 0) {
SSize_t count = PerlIO_write(n, where, avail);
if (count > 0) {
where += count;
avail -= count;
} else if (count < 0 || PerlIO_error(n)) {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_flush write failed, data lost\n");
#endif
PerlIOBase(f)->flags |= PERLIO_F_ERROR;
return -1;
#if DEBUG_LAYERGZIP
} else {
PerlIO_debug("PerlIOGzip_flush wrote 0 - aren't we spinning?\n");
#endif
}
}
z->next_out = (Bytef *) g->outbuf;
z->avail_out = OUTSIZE;
}
} else {
#if DEBUG_LAYERGZIP
PerlIO_debug("PerlIOGzip_flush deflate failed %d, data lost\n",
status);
#endif
PerlIOBase(f)->flags |= PERLIO_F_ERROR;
return -1;
}
}
b->ptr = b->end = b->buf;
PerlIOBase(f)->flags &= ~(PERLIO_F_WRBUF);
if (PerlIO_flush(PerlIONext(f)) != 0)
return -1;
}
return 0;
}
/* Hmm. These need to be public? */
static IV
PerlIOGzip_seek_fail(pTHX_ PerlIO *f, Off_t offset, int whence)
{
return -1;
}
PerlIO *
PerlIOGzip_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
{
croak ("PerlIO::gzip can't yet clone active layers");
return NULL;
}
PerlIO_funcs PerlIO_gzip = {
sizeof(PerlIO_funcs),
"gzip",
sizeof(PerlIOGzip),
PERLIO_K_BUFFERED, /* XXX destruct */
PerlIOGzip_pushed,
PerlIOGzip_popped,
PerlIOBuf_open,
PerlIOBase_binmode,
PerlIOGzip_getarg,
PerlIOBase_fileno,
PerlIOGzip_dup,
PerlIOBuf_read,
PerlIOBuf_unread, /* I am not convinced that this is going to work */
PerlIOBuf_write,
PerlIOGzip_seek_fail, /* PerlIOBuf_seek, */
PerlIOBuf_tell,
PerlIOGzip_close,
PerlIOGzip_flush, /* PerlIOBuf_flush, Hmm. open() expects to flush :-( */
PerlIOGzip_fill,
PerlIOBase_eof,
PerlIOBase_error,
PerlIOBase_clearerr,
PerlIOBase_setlinebuf,
PerlIOBuf_get_base,
PerlIOBuf_bufsiz,
PerlIOBuf_get_ptr,
PerlIOBuf_get_cnt,
PerlIOBuf_set_ptrcnt,
};
MODULE = PerlIO::gzip PACKAGE = PerlIO::gzip
PROTOTYPES: DISABLE
BOOT:
PerlIO_define_layer(aTHX_ &PerlIO_gzip);
|