archive_read_support_format_7zip.c revision 344673
1/*- 2 * Copyright (c) 2011 Michihiro NAKAJIMA 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "archive_platform.h" 27__FBSDID("$FreeBSD$"); 28 29#ifdef HAVE_ERRNO_H 30#include <errno.h> 31#endif 32#ifdef HAVE_STDLIB_H 33#include <stdlib.h> 34#endif 35#ifdef HAVE_BZLIB_H 36#include <bzlib.h> 37#endif 38#ifdef HAVE_LZMA_H 39#include <lzma.h> 40#endif 41#ifdef HAVE_ZLIB_H 42#include <zlib.h> 43#endif 44 45#include "archive.h" 46#include "archive_entry.h" 47#include "archive_entry_locale.h" 48#include "archive_ppmd7_private.h" 49#include "archive_private.h" 50#include "archive_read_private.h" 51#include "archive_endian.h" 52 53#ifndef HAVE_ZLIB_H 54#include "archive_crc32.h" 55#endif 56 57#define _7ZIP_SIGNATURE "7z\xBC\xAF\x27\x1C" 58#define SFX_MIN_ADDR 0x27000 59#define SFX_MAX_ADDR 0x60000 60 61 62/* 63 * Codec ID 64 */ 65#define _7Z_COPY 0 66#define _7Z_LZMA 0x030101 67#define _7Z_LZMA2 0x21 68#define _7Z_DEFLATE 0x040108 69#define _7Z_BZ2 0x040202 70#define _7Z_PPMD 0x030401 71#define _7Z_DELTA 0x03 72#define _7Z_CRYPTO_MAIN_ZIP 0x06F10101 /* Main Zip crypto algo */ 73#define _7Z_CRYPTO_RAR_29 0x06F10303 /* Rar29 AES-128 + (modified SHA-1) */ 74#define _7Z_CRYPTO_AES_256_SHA_256 0x06F10701 /* AES-256 + SHA-256 */ 75 76 77#define _7Z_X86 0x03030103 78#define _7Z_X86_BCJ2 0x0303011B 79#define _7Z_POWERPC 0x03030205 80#define _7Z_IA64 0x03030401 81#define _7Z_ARM 0x03030501 82#define _7Z_ARMTHUMB 0x03030701 83#define _7Z_SPARC 0x03030805 84 85/* 86 * 7-Zip header property IDs. 87 */ 88#define kEnd 0x00 89#define kHeader 0x01 90#define kArchiveProperties 0x02 91#define kAdditionalStreamsInfo 0x03 92#define kMainStreamsInfo 0x04 93#define kFilesInfo 0x05 94#define kPackInfo 0x06 95#define kUnPackInfo 0x07 96#define kSubStreamsInfo 0x08 97#define kSize 0x09 98#define kCRC 0x0A 99#define kFolder 0x0B 100#define kCodersUnPackSize 0x0C 101#define kNumUnPackStream 0x0D 102#define kEmptyStream 0x0E 103#define kEmptyFile 0x0F 104#define kAnti 0x10 105#define kName 0x11 106#define kCTime 0x12 107#define kATime 0x13 108#define kMTime 0x14 109#define kAttributes 0x15 110#define kEncodedHeader 0x17 111#define kDummy 0x19 112 113struct _7z_digests { 114 unsigned char *defineds; 115 uint32_t *digests; 116}; 117 118 119struct _7z_folder { 120 uint64_t numCoders; 121 struct _7z_coder { 122 unsigned long codec; 123 uint64_t numInStreams; 124 uint64_t numOutStreams; 125 uint64_t propertiesSize; 126 unsigned char *properties; 127 } *coders; 128 uint64_t numBindPairs; 129 struct { 130 uint64_t inIndex; 131 uint64_t outIndex; 132 } *bindPairs; 133 uint64_t numPackedStreams; 134 uint64_t *packedStreams; 135 uint64_t numInStreams; 136 uint64_t numOutStreams; 137 uint64_t *unPackSize; 138 unsigned char digest_defined; 139 uint32_t digest; 140 uint64_t numUnpackStreams; 141 uint32_t packIndex; 142 /* Unoperated bytes. */ 143 uint64_t skipped_bytes; 144}; 145 146struct _7z_coders_info { 147 uint64_t numFolders; 148 struct _7z_folder *folders; 149 uint64_t dataStreamIndex; 150}; 151 152struct _7z_pack_info { 153 uint64_t pos; 154 uint64_t numPackStreams; 155 uint64_t *sizes; 156 struct _7z_digests digest; 157 /* Calculated from pos and numPackStreams. */ 158 uint64_t *positions; 159}; 160 161struct _7z_substream_info { 162 size_t unpack_streams; 163 uint64_t *unpackSizes; 164 unsigned char *digestsDefined; 165 uint32_t *digests; 166}; 167 168struct _7z_stream_info { 169 struct _7z_pack_info pi; 170 struct _7z_coders_info ci; 171 struct _7z_substream_info ss; 172}; 173 174struct _7z_header_info { 175 uint64_t dataIndex; 176 177 unsigned char *emptyStreamBools; 178 unsigned char *emptyFileBools; 179 unsigned char *antiBools; 180 unsigned char *attrBools; 181}; 182 183struct _7zip_entry { 184 size_t name_len; 185 unsigned char *utf16name; 186#if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG) 187 const wchar_t *wname; 188#endif 189 uint32_t folderIndex; 190 uint32_t ssIndex; 191 unsigned flg; 192#define MTIME_IS_SET (1<<0) 193#define ATIME_IS_SET (1<<1) 194#define CTIME_IS_SET (1<<2) 195#define CRC32_IS_SET (1<<3) 196#define HAS_STREAM (1<<4) 197 198 time_t mtime; 199 time_t atime; 200 time_t ctime; 201 long mtime_ns; 202 long atime_ns; 203 long ctime_ns; 204 uint32_t mode; 205 uint32_t attr; 206}; 207 208struct _7zip { 209 /* Structural information about the archive. */ 210 struct _7z_stream_info si; 211 212 int header_is_being_read; 213 int header_is_encoded; 214 uint64_t header_bytes_remaining; 215 unsigned long header_crc32; 216 /* Header offset to check that reading points of the file contents 217 * will not exceed the header. */ 218 uint64_t header_offset; 219 /* Base offset of the archive file for a seek in case reading SFX. */ 220 uint64_t seek_base; 221 222 /* List of entries */ 223 size_t entries_remaining; 224 uint64_t numFiles; 225 struct _7zip_entry *entries; 226 struct _7zip_entry *entry; 227 unsigned char *entry_names; 228 229 /* entry_bytes_remaining is the number of bytes we expect. */ 230 int64_t entry_offset; 231 uint64_t entry_bytes_remaining; 232 233 /* Running CRC32 of the decompressed data */ 234 unsigned long entry_crc32; 235 236 /* Flags to mark progress of decompression. */ 237 char end_of_entry; 238 239 /* Uncompressed buffer control. */ 240#define UBUFF_SIZE (64 * 1024) 241 unsigned char *uncompressed_buffer; 242 unsigned char *uncompressed_buffer_pointer; 243 size_t uncompressed_buffer_size; 244 size_t uncompressed_buffer_bytes_remaining; 245 246 /* Offset of the compressed data. */ 247 int64_t stream_offset; 248 249 /* 250 * Decompressing control data. 251 */ 252 unsigned folder_index; 253 uint64_t folder_outbytes_remaining; 254 unsigned pack_stream_index; 255 unsigned pack_stream_remaining; 256 uint64_t pack_stream_inbytes_remaining; 257 size_t pack_stream_bytes_unconsumed; 258 259 /* The codec information of a folder. */ 260 unsigned long codec; 261 unsigned long codec2; 262 263 /* 264 * Decompressor controllers. 265 */ 266 /* Decoding LZMA1 and LZMA2 data. */ 267#ifdef HAVE_LZMA_H 268 lzma_stream lzstream; 269 int lzstream_valid; 270#endif 271 /* Decoding bzip2 data. */ 272#if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR) 273 bz_stream bzstream; 274 int bzstream_valid; 275#endif 276 /* Decoding deflate data. */ 277#ifdef HAVE_ZLIB_H 278 z_stream stream; 279 int stream_valid; 280#endif 281 /* Decoding PPMd data. */ 282 int ppmd7_stat; 283 CPpmd7 ppmd7_context; 284 CPpmd7z_RangeDec range_dec; 285 IByteIn bytein; 286 struct { 287 const unsigned char *next_in; 288 int64_t avail_in; 289 int64_t total_in; 290 unsigned char *next_out; 291 int64_t avail_out; 292 int64_t total_out; 293 int overconsumed; 294 } ppstream; 295 int ppmd7_valid; 296 297 /* Decoding BCJ and BCJ2 data. */ 298 uint32_t bcj_state; 299 size_t odd_bcj_size; 300 unsigned char odd_bcj[4]; 301 /* Decoding BCJ data. */ 302 size_t bcj_prevPosT; 303 uint32_t bcj_prevMask; 304 uint32_t bcj_ip; 305 306 /* Decoding BCJ2 data. */ 307 size_t main_stream_bytes_remaining; 308 unsigned char *sub_stream_buff[3]; 309 size_t sub_stream_size[3]; 310 size_t sub_stream_bytes_remaining[3]; 311 unsigned char *tmp_stream_buff; 312 size_t tmp_stream_buff_size; 313 size_t tmp_stream_bytes_avail; 314 size_t tmp_stream_bytes_remaining; 315#ifdef _LZMA_PROB32 316#define CProb uint32_t 317#else 318#define CProb uint16_t 319#endif 320 CProb bcj2_p[256 + 2]; 321 uint8_t bcj2_prevByte; 322 uint32_t bcj2_range; 323 uint32_t bcj2_code; 324 uint64_t bcj2_outPos; 325 326 /* Filename character-set conversion data. */ 327 struct archive_string_conv *sconv; 328 329 char format_name[64]; 330 331 /* Custom value that is non-zero if this archive contains encrypted entries. */ 332 int has_encrypted_entries; 333}; 334 335/* Maximum entry size. This limitation prevents reading intentional 336 * corrupted 7-zip files on assuming there are not so many entries in 337 * the files. */ 338#define UMAX_ENTRY ARCHIVE_LITERAL_ULL(100000000) 339 340static int archive_read_format_7zip_has_encrypted_entries(struct archive_read *); 341static int archive_read_support_format_7zip_capabilities(struct archive_read *a); 342static int archive_read_format_7zip_bid(struct archive_read *, int); 343static int archive_read_format_7zip_cleanup(struct archive_read *); 344static int archive_read_format_7zip_read_data(struct archive_read *, 345 const void **, size_t *, int64_t *); 346static int archive_read_format_7zip_read_data_skip(struct archive_read *); 347static int archive_read_format_7zip_read_header(struct archive_read *, 348 struct archive_entry *); 349static int check_7zip_header_in_sfx(const char *); 350static unsigned long decode_codec_id(const unsigned char *, size_t); 351static int decode_encoded_header_info(struct archive_read *, 352 struct _7z_stream_info *); 353static int decompress(struct archive_read *, struct _7zip *, 354 void *, size_t *, const void *, size_t *); 355static ssize_t extract_pack_stream(struct archive_read *, size_t); 356static void fileTimeToUtc(uint64_t, time_t *, long *); 357static uint64_t folder_uncompressed_size(struct _7z_folder *); 358static void free_CodersInfo(struct _7z_coders_info *); 359static void free_Digest(struct _7z_digests *); 360static void free_Folder(struct _7z_folder *); 361static void free_Header(struct _7z_header_info *); 362static void free_PackInfo(struct _7z_pack_info *); 363static void free_StreamsInfo(struct _7z_stream_info *); 364static void free_SubStreamsInfo(struct _7z_substream_info *); 365static int free_decompression(struct archive_read *, struct _7zip *); 366static ssize_t get_uncompressed_data(struct archive_read *, const void **, 367 size_t, size_t); 368static const unsigned char * header_bytes(struct archive_read *, size_t); 369static int init_decompression(struct archive_read *, struct _7zip *, 370 const struct _7z_coder *, const struct _7z_coder *); 371static int parse_7zip_uint64(struct archive_read *, uint64_t *); 372static int read_Bools(struct archive_read *, unsigned char *, size_t); 373static int read_CodersInfo(struct archive_read *, 374 struct _7z_coders_info *); 375static int read_Digests(struct archive_read *, struct _7z_digests *, 376 size_t); 377static int read_Folder(struct archive_read *, struct _7z_folder *); 378static int read_Header(struct archive_read *, struct _7z_header_info *, 379 int); 380static int read_PackInfo(struct archive_read *, struct _7z_pack_info *); 381static int read_StreamsInfo(struct archive_read *, 382 struct _7z_stream_info *); 383static int read_SubStreamsInfo(struct archive_read *, 384 struct _7z_substream_info *, struct _7z_folder *, size_t); 385static int read_Times(struct archive_read *, struct _7z_header_info *, 386 int); 387static void read_consume(struct archive_read *); 388static ssize_t read_stream(struct archive_read *, const void **, size_t, 389 size_t); 390static int seek_pack(struct archive_read *); 391static int64_t skip_stream(struct archive_read *, size_t); 392static int skip_sfx(struct archive_read *, ssize_t); 393static int slurp_central_directory(struct archive_read *, struct _7zip *, 394 struct _7z_header_info *); 395static int setup_decode_folder(struct archive_read *, struct _7z_folder *, 396 int); 397static void x86_Init(struct _7zip *); 398static size_t x86_Convert(struct _7zip *, uint8_t *, size_t); 399static ssize_t Bcj2_Decode(struct _7zip *, uint8_t *, size_t); 400 401 402int 403archive_read_support_format_7zip(struct archive *_a) 404{ 405 struct archive_read *a = (struct archive_read *)_a; 406 struct _7zip *zip; 407 int r; 408 409 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 410 ARCHIVE_STATE_NEW, "archive_read_support_format_7zip"); 411 412 zip = calloc(1, sizeof(*zip)); 413 if (zip == NULL) { 414 archive_set_error(&a->archive, ENOMEM, 415 "Can't allocate 7zip data"); 416 return (ARCHIVE_FATAL); 417 } 418 419 /* 420 * Until enough data has been read, we cannot tell about 421 * any encrypted entries yet. 422 */ 423 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 424 425 426 r = __archive_read_register_format(a, 427 zip, 428 "7zip", 429 archive_read_format_7zip_bid, 430 NULL, 431 archive_read_format_7zip_read_header, 432 archive_read_format_7zip_read_data, 433 archive_read_format_7zip_read_data_skip, 434 NULL, 435 archive_read_format_7zip_cleanup, 436 archive_read_support_format_7zip_capabilities, 437 archive_read_format_7zip_has_encrypted_entries); 438 439 if (r != ARCHIVE_OK) 440 free(zip); 441 return (ARCHIVE_OK); 442} 443 444static int 445archive_read_support_format_7zip_capabilities(struct archive_read * a) 446{ 447 (void)a; /* UNUSED */ 448 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | 449 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); 450} 451 452 453static int 454archive_read_format_7zip_has_encrypted_entries(struct archive_read *_a) 455{ 456 if (_a && _a->format) { 457 struct _7zip * zip = (struct _7zip *)_a->format->data; 458 if (zip) { 459 return zip->has_encrypted_entries; 460 } 461 } 462 return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 463} 464 465static int 466archive_read_format_7zip_bid(struct archive_read *a, int best_bid) 467{ 468 const char *p; 469 470 /* If someone has already bid more than 32, then avoid 471 trashing the look-ahead buffers with a seek. */ 472 if (best_bid > 32) 473 return (-1); 474 475 if ((p = __archive_read_ahead(a, 6, NULL)) == NULL) 476 return (0); 477 478 /* If first six bytes are the 7-Zip signature, 479 * return the bid right now. */ 480 if (memcmp(p, _7ZIP_SIGNATURE, 6) == 0) 481 return (48); 482 483 /* 484 * It may a 7-Zip SFX archive file. If first two bytes are 485 * 'M' and 'Z' available on Windows or first four bytes are 486 * "\x7F\x45LF" available on posix like system, seek the 7-Zip 487 * signature. Although we will perform a seek when reading 488 * a header, what we do not use __archive_read_seek() here is 489 * due to a bidding performance. 490 */ 491 if ((p[0] == 'M' && p[1] == 'Z') || memcmp(p, "\x7F\x45LF", 4) == 0) { 492 ssize_t offset = SFX_MIN_ADDR; 493 ssize_t window = 4096; 494 ssize_t bytes_avail; 495 while (offset + window <= (SFX_MAX_ADDR)) { 496 const char *buff = __archive_read_ahead(a, 497 offset + window, &bytes_avail); 498 if (buff == NULL) { 499 /* Remaining bytes are less than window. */ 500 window >>= 1; 501 if (window < 0x40) 502 return (0); 503 continue; 504 } 505 p = buff + offset; 506 while (p + 32 < buff + bytes_avail) { 507 int step = check_7zip_header_in_sfx(p); 508 if (step == 0) 509 return (48); 510 p += step; 511 } 512 offset = p - buff; 513 } 514 } 515 return (0); 516} 517 518static int 519check_7zip_header_in_sfx(const char *p) 520{ 521 switch ((unsigned char)p[5]) { 522 case 0x1C: 523 if (memcmp(p, _7ZIP_SIGNATURE, 6) != 0) 524 return (6); 525 /* 526 * Test the CRC because its extraction code has 7-Zip 527 * Magic Code, so we should do this in order not to 528 * make a mis-detection. 529 */ 530 if (crc32(0, (const unsigned char *)p + 12, 20) 531 != archive_le32dec(p + 8)) 532 return (6); 533 /* Hit the header! */ 534 return (0); 535 case 0x37: return (5); 536 case 0x7A: return (4); 537 case 0xBC: return (3); 538 case 0xAF: return (2); 539 case 0x27: return (1); 540 default: return (6); 541 } 542} 543 544static int 545skip_sfx(struct archive_read *a, ssize_t bytes_avail) 546{ 547 const void *h; 548 const char *p, *q; 549 size_t skip, offset; 550 ssize_t bytes, window; 551 552 /* 553 * If bytes_avail > SFX_MIN_ADDR we do not have to call 554 * __archive_read_seek() at this time since we have 555 * already had enough data. 556 */ 557 if (bytes_avail > SFX_MIN_ADDR) 558 __archive_read_consume(a, SFX_MIN_ADDR); 559 else if (__archive_read_seek(a, SFX_MIN_ADDR, SEEK_SET) < 0) 560 return (ARCHIVE_FATAL); 561 562 offset = 0; 563 window = 1; 564 while (offset + window <= SFX_MAX_ADDR - SFX_MIN_ADDR) { 565 h = __archive_read_ahead(a, window, &bytes); 566 if (h == NULL) { 567 /* Remaining bytes are less than window. */ 568 window >>= 1; 569 if (window < 0x40) 570 goto fatal; 571 continue; 572 } 573 if (bytes < 6) { 574 /* This case might happen when window == 1. */ 575 window = 4096; 576 continue; 577 } 578 p = (const char *)h; 579 q = p + bytes; 580 581 /* 582 * Scan ahead until we find something that looks 583 * like the 7-Zip header. 584 */ 585 while (p + 32 < q) { 586 int step = check_7zip_header_in_sfx(p); 587 if (step == 0) { 588 struct _7zip *zip = 589 (struct _7zip *)a->format->data; 590 skip = p - (const char *)h; 591 __archive_read_consume(a, skip); 592 zip->seek_base = SFX_MIN_ADDR + offset + skip; 593 return (ARCHIVE_OK); 594 } 595 p += step; 596 } 597 skip = p - (const char *)h; 598 __archive_read_consume(a, skip); 599 offset += skip; 600 if (window == 1) 601 window = 4096; 602 } 603fatal: 604 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 605 "Couldn't find out 7-Zip header"); 606 return (ARCHIVE_FATAL); 607} 608 609static int 610archive_read_format_7zip_read_header(struct archive_read *a, 611 struct archive_entry *entry) 612{ 613 struct _7zip *zip = (struct _7zip *)a->format->data; 614 struct _7zip_entry *zip_entry; 615 int r, ret = ARCHIVE_OK; 616 struct _7z_folder *folder = 0; 617 uint64_t fidx = 0; 618 619 /* 620 * It should be sufficient to call archive_read_next_header() for 621 * a reader to determine if an entry is encrypted or not. If the 622 * encryption of an entry is only detectable when calling 623 * archive_read_data(), so be it. We'll do the same check there 624 * as well. 625 */ 626 if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { 627 zip->has_encrypted_entries = 0; 628 } 629 630 a->archive.archive_format = ARCHIVE_FORMAT_7ZIP; 631 if (a->archive.archive_format_name == NULL) 632 a->archive.archive_format_name = "7-Zip"; 633 634 if (zip->entries == NULL) { 635 struct _7z_header_info header; 636 637 memset(&header, 0, sizeof(header)); 638 r = slurp_central_directory(a, zip, &header); 639 free_Header(&header); 640 if (r != ARCHIVE_OK) 641 return (r); 642 zip->entries_remaining = (size_t)zip->numFiles; 643 zip->entry = zip->entries; 644 } else { 645 ++zip->entry; 646 } 647 zip_entry = zip->entry; 648 649 if (zip->entries_remaining <= 0 || zip_entry == NULL) 650 return ARCHIVE_EOF; 651 --zip->entries_remaining; 652 653 zip->entry_offset = 0; 654 zip->end_of_entry = 0; 655 zip->entry_crc32 = crc32(0, NULL, 0); 656 657 /* Setup a string conversion for a filename. */ 658 if (zip->sconv == NULL) { 659 zip->sconv = archive_string_conversion_from_charset( 660 &a->archive, "UTF-16LE", 1); 661 if (zip->sconv == NULL) 662 return (ARCHIVE_FATAL); 663 } 664 665 /* Figure out if the entry is encrypted by looking at the folder 666 that is associated to the current 7zip entry. If the folder 667 has a coder with a _7Z_CRYPTO codec then the folder is encrypted. 668 Hence the entry must also be encrypted. */ 669 if (zip_entry && zip_entry->folderIndex < zip->si.ci.numFolders) { 670 folder = &(zip->si.ci.folders[zip_entry->folderIndex]); 671 for (fidx=0; folder && fidx<folder->numCoders; fidx++) { 672 switch(folder->coders[fidx].codec) { 673 case _7Z_CRYPTO_MAIN_ZIP: 674 case _7Z_CRYPTO_RAR_29: 675 case _7Z_CRYPTO_AES_256_SHA_256: { 676 archive_entry_set_is_data_encrypted(entry, 1); 677 zip->has_encrypted_entries = 1; 678 break; 679 } 680 } 681 } 682 } 683 684 /* Now that we've checked for encryption, if there were still no 685 * encrypted entries found we can say for sure that there are none. 686 */ 687 if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { 688 zip->has_encrypted_entries = 0; 689 } 690 691 if (archive_entry_copy_pathname_l(entry, 692 (const char *)zip_entry->utf16name, 693 zip_entry->name_len, zip->sconv) != 0) { 694 if (errno == ENOMEM) { 695 archive_set_error(&a->archive, ENOMEM, 696 "Can't allocate memory for Pathname"); 697 return (ARCHIVE_FATAL); 698 } 699 archive_set_error(&a->archive, 700 ARCHIVE_ERRNO_FILE_FORMAT, 701 "Pathname cannot be converted " 702 "from %s to current locale.", 703 archive_string_conversion_charset_name(zip->sconv)); 704 ret = ARCHIVE_WARN; 705 } 706 707 /* Populate some additional entry fields: */ 708 archive_entry_set_mode(entry, zip_entry->mode); 709 if (zip_entry->flg & MTIME_IS_SET) 710 archive_entry_set_mtime(entry, zip_entry->mtime, 711 zip_entry->mtime_ns); 712 if (zip_entry->flg & CTIME_IS_SET) 713 archive_entry_set_ctime(entry, zip_entry->ctime, 714 zip_entry->ctime_ns); 715 if (zip_entry->flg & ATIME_IS_SET) 716 archive_entry_set_atime(entry, zip_entry->atime, 717 zip_entry->atime_ns); 718 if (zip_entry->ssIndex != (uint32_t)-1) { 719 zip->entry_bytes_remaining = 720 zip->si.ss.unpackSizes[zip_entry->ssIndex]; 721 archive_entry_set_size(entry, zip->entry_bytes_remaining); 722 } else { 723 zip->entry_bytes_remaining = 0; 724 archive_entry_set_size(entry, 0); 725 } 726 727 /* If there's no body, force read_data() to return EOF immediately. */ 728 if (zip->entry_bytes_remaining < 1) 729 zip->end_of_entry = 1; 730 731 if ((zip_entry->mode & AE_IFMT) == AE_IFLNK) { 732 unsigned char *symname = NULL; 733 size_t symsize = 0; 734 735 /* 736 * Symbolic-name is recorded as its contents. We have to 737 * read the contents at this time. 738 */ 739 while (zip->entry_bytes_remaining > 0) { 740 const void *buff; 741 unsigned char *mem; 742 size_t size; 743 int64_t offset; 744 745 r = archive_read_format_7zip_read_data(a, &buff, 746 &size, &offset); 747 if (r < ARCHIVE_WARN) { 748 free(symname); 749 return (r); 750 } 751 mem = realloc(symname, symsize + size + 1); 752 if (mem == NULL) { 753 free(symname); 754 archive_set_error(&a->archive, ENOMEM, 755 "Can't allocate memory for Symname"); 756 return (ARCHIVE_FATAL); 757 } 758 symname = mem; 759 memcpy(symname+symsize, buff, size); 760 symsize += size; 761 } 762 if (symsize == 0) { 763 /* If there is no symname, handle it as a regular 764 * file. */ 765 zip_entry->mode &= ~AE_IFMT; 766 zip_entry->mode |= AE_IFREG; 767 archive_entry_set_mode(entry, zip_entry->mode); 768 } else { 769 symname[symsize] = '\0'; 770 archive_entry_copy_symlink(entry, 771 (const char *)symname); 772 } 773 free(symname); 774 archive_entry_set_size(entry, 0); 775 } 776 777 /* Set up a more descriptive format name. */ 778 sprintf(zip->format_name, "7-Zip"); 779 a->archive.archive_format_name = zip->format_name; 780 781 return (ret); 782} 783 784static int 785archive_read_format_7zip_read_data(struct archive_read *a, 786 const void **buff, size_t *size, int64_t *offset) 787{ 788 struct _7zip *zip; 789 ssize_t bytes; 790 int ret = ARCHIVE_OK; 791 792 zip = (struct _7zip *)(a->format->data); 793 794 if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { 795 zip->has_encrypted_entries = 0; 796 } 797 798 if (zip->pack_stream_bytes_unconsumed) 799 read_consume(a); 800 801 *offset = zip->entry_offset; 802 *size = 0; 803 *buff = NULL; 804 /* 805 * If we hit end-of-entry last time, clean up and return 806 * ARCHIVE_EOF this time. 807 */ 808 if (zip->end_of_entry) 809 return (ARCHIVE_EOF); 810 811 bytes = read_stream(a, buff, 812 (size_t)zip->entry_bytes_remaining, 0); 813 if (bytes < 0) 814 return ((int)bytes); 815 if (bytes == 0) { 816 archive_set_error(&a->archive, 817 ARCHIVE_ERRNO_FILE_FORMAT, 818 "Truncated 7-Zip file body"); 819 return (ARCHIVE_FATAL); 820 } 821 zip->entry_bytes_remaining -= bytes; 822 if (zip->entry_bytes_remaining == 0) 823 zip->end_of_entry = 1; 824 825 /* Update checksum */ 826 if ((zip->entry->flg & CRC32_IS_SET) && bytes) 827 zip->entry_crc32 = crc32(zip->entry_crc32, *buff, 828 (unsigned)bytes); 829 830 /* If we hit the end, swallow any end-of-data marker. */ 831 if (zip->end_of_entry) { 832 /* Check computed CRC against file contents. */ 833 if ((zip->entry->flg & CRC32_IS_SET) && 834 zip->si.ss.digests[zip->entry->ssIndex] != 835 zip->entry_crc32) { 836 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 837 "7-Zip bad CRC: 0x%lx should be 0x%lx", 838 (unsigned long)zip->entry_crc32, 839 (unsigned long)zip->si.ss.digests[ 840 zip->entry->ssIndex]); 841 ret = ARCHIVE_WARN; 842 } 843 } 844 845 *size = bytes; 846 *offset = zip->entry_offset; 847 zip->entry_offset += bytes; 848 849 return (ret); 850} 851 852static int 853archive_read_format_7zip_read_data_skip(struct archive_read *a) 854{ 855 struct _7zip *zip; 856 int64_t bytes_skipped; 857 858 zip = (struct _7zip *)(a->format->data); 859 860 if (zip->pack_stream_bytes_unconsumed) 861 read_consume(a); 862 863 /* If we've already read to end of data, we're done. */ 864 if (zip->end_of_entry) 865 return (ARCHIVE_OK); 866 867 /* 868 * If the length is at the beginning, we can skip the 869 * compressed data much more quickly. 870 */ 871 bytes_skipped = skip_stream(a, (size_t)zip->entry_bytes_remaining); 872 if (bytes_skipped < 0) 873 return (ARCHIVE_FATAL); 874 zip->entry_bytes_remaining = 0; 875 876 /* This entry is finished and done. */ 877 zip->end_of_entry = 1; 878 return (ARCHIVE_OK); 879} 880 881static int 882archive_read_format_7zip_cleanup(struct archive_read *a) 883{ 884 struct _7zip *zip; 885 886 zip = (struct _7zip *)(a->format->data); 887 free_StreamsInfo(&(zip->si)); 888 free(zip->entries); 889 free(zip->entry_names); 890 free_decompression(a, zip); 891 free(zip->uncompressed_buffer); 892 free(zip->sub_stream_buff[0]); 893 free(zip->sub_stream_buff[1]); 894 free(zip->sub_stream_buff[2]); 895 free(zip->tmp_stream_buff); 896 free(zip); 897 (a->format->data) = NULL; 898 return (ARCHIVE_OK); 899} 900 901static void 902read_consume(struct archive_read *a) 903{ 904 struct _7zip *zip = (struct _7zip *)a->format->data; 905 906 if (zip->pack_stream_bytes_unconsumed) { 907 __archive_read_consume(a, zip->pack_stream_bytes_unconsumed); 908 zip->stream_offset += zip->pack_stream_bytes_unconsumed; 909 zip->pack_stream_bytes_unconsumed = 0; 910 } 911} 912 913#ifdef HAVE_LZMA_H 914 915/* 916 * Set an error code and choose an error message for liblzma. 917 */ 918static void 919set_error(struct archive_read *a, int ret) 920{ 921 922 switch (ret) { 923 case LZMA_STREAM_END: /* Found end of stream. */ 924 case LZMA_OK: /* Decompressor made some progress. */ 925 break; 926 case LZMA_MEM_ERROR: 927 archive_set_error(&a->archive, ENOMEM, 928 "Lzma library error: Cannot allocate memory"); 929 break; 930 case LZMA_MEMLIMIT_ERROR: 931 archive_set_error(&a->archive, ENOMEM, 932 "Lzma library error: Out of memory"); 933 break; 934 case LZMA_FORMAT_ERROR: 935 archive_set_error(&a->archive, 936 ARCHIVE_ERRNO_MISC, 937 "Lzma library error: format not recognized"); 938 break; 939 case LZMA_OPTIONS_ERROR: 940 archive_set_error(&a->archive, 941 ARCHIVE_ERRNO_MISC, 942 "Lzma library error: Invalid options"); 943 break; 944 case LZMA_DATA_ERROR: 945 archive_set_error(&a->archive, 946 ARCHIVE_ERRNO_MISC, 947 "Lzma library error: Corrupted input data"); 948 break; 949 case LZMA_BUF_ERROR: 950 archive_set_error(&a->archive, 951 ARCHIVE_ERRNO_MISC, 952 "Lzma library error: No progress is possible"); 953 break; 954 default: 955 /* Return an error. */ 956 archive_set_error(&a->archive, 957 ARCHIVE_ERRNO_MISC, 958 "Lzma decompression failed: Unknown error"); 959 break; 960 } 961} 962 963#endif 964 965static unsigned long 966decode_codec_id(const unsigned char *codecId, size_t id_size) 967{ 968 unsigned i; 969 unsigned long id = 0; 970 971 for (i = 0; i < id_size; i++) { 972 id <<= 8; 973 id += codecId[i]; 974 } 975 return (id); 976} 977 978static Byte 979ppmd_read(void *p) 980{ 981 struct archive_read *a = ((IByteIn*)p)->a; 982 struct _7zip *zip = (struct _7zip *)(a->format->data); 983 Byte b; 984 985 if (zip->ppstream.avail_in == 0) { 986 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 987 "Truncated RAR file data"); 988 zip->ppstream.overconsumed = 1; 989 return (0); 990 } 991 b = *zip->ppstream.next_in++; 992 zip->ppstream.avail_in--; 993 zip->ppstream.total_in++; 994 return (b); 995} 996 997static int 998init_decompression(struct archive_read *a, struct _7zip *zip, 999 const struct _7z_coder *coder1, const struct _7z_coder *coder2) 1000{ 1001 int r; 1002 1003 zip->codec = coder1->codec; 1004 zip->codec2 = -1; 1005 1006 switch (zip->codec) { 1007 case _7Z_COPY: 1008 case _7Z_BZ2: 1009 case _7Z_DEFLATE: 1010 case _7Z_PPMD: 1011 if (coder2 != NULL) { 1012 if (coder2->codec != _7Z_X86 && 1013 coder2->codec != _7Z_X86_BCJ2) { 1014 archive_set_error(&a->archive, 1015 ARCHIVE_ERRNO_MISC, 1016 "Unsupported filter %lx for %lx", 1017 coder2->codec, coder1->codec); 1018 return (ARCHIVE_FAILED); 1019 } 1020 zip->codec2 = coder2->codec; 1021 zip->bcj_state = 0; 1022 if (coder2->codec == _7Z_X86) 1023 x86_Init(zip); 1024 } 1025 break; 1026 default: 1027 break; 1028 } 1029 1030 switch (zip->codec) { 1031 case _7Z_COPY: 1032 break; 1033 1034 case _7Z_LZMA: case _7Z_LZMA2: 1035#ifdef HAVE_LZMA_H 1036#if LZMA_VERSION_MAJOR >= 5 1037/* Effectively disable the limiter. */ 1038#define LZMA_MEMLIMIT UINT64_MAX 1039#else 1040/* NOTE: This needs to check memory size which running system has. */ 1041#define LZMA_MEMLIMIT (1U << 30) 1042#endif 1043 { 1044 lzma_options_delta delta_opt; 1045 lzma_filter filters[LZMA_FILTERS_MAX], *ff; 1046 int fi = 0; 1047 1048 if (zip->lzstream_valid) { 1049 lzma_end(&(zip->lzstream)); 1050 zip->lzstream_valid = 0; 1051 } 1052 1053 /* 1054 * NOTE: liblzma incompletely handle the BCJ+LZMA compressed 1055 * data made by 7-Zip because 7-Zip does not add End-Of- 1056 * Payload Marker(EOPM) at the end of LZMA compressed data, 1057 * and so liblzma cannot know the end of the compressed data 1058 * without EOPM. So consequently liblzma will not return last 1059 * three or four bytes of uncompressed data because 1060 * LZMA_FILTER_X86 filter does not handle input data if its 1061 * data size is less than five bytes. If liblzma detect EOPM 1062 * or know the uncompressed data size, liblzma will flush out 1063 * the remaining that three or four bytes of uncompressed 1064 * data. That is why we have to use our converting program 1065 * for BCJ+LZMA. If we were able to tell the uncompressed 1066 * size to liblzma when using lzma_raw_decoder() liblzma 1067 * could correctly deal with BCJ+LZMA. But unfortunately 1068 * there is no way to do that. 1069 * Discussion about this can be found at XZ Utils forum. 1070 */ 1071 if (coder2 != NULL) { 1072 zip->codec2 = coder2->codec; 1073 1074 filters[fi].options = NULL; 1075 switch (zip->codec2) { 1076 case _7Z_X86: 1077 if (zip->codec == _7Z_LZMA2) { 1078 filters[fi].id = LZMA_FILTER_X86; 1079 fi++; 1080 } else 1081 /* Use our filter. */ 1082 x86_Init(zip); 1083 break; 1084 case _7Z_X86_BCJ2: 1085 /* Use our filter. */ 1086 zip->bcj_state = 0; 1087 break; 1088 case _7Z_DELTA: 1089 filters[fi].id = LZMA_FILTER_DELTA; 1090 memset(&delta_opt, 0, sizeof(delta_opt)); 1091 delta_opt.type = LZMA_DELTA_TYPE_BYTE; 1092 delta_opt.dist = 1; 1093 filters[fi].options = &delta_opt; 1094 fi++; 1095 break; 1096 /* Following filters have not been tested yet. */ 1097 case _7Z_POWERPC: 1098 filters[fi].id = LZMA_FILTER_POWERPC; 1099 fi++; 1100 break; 1101 case _7Z_IA64: 1102 filters[fi].id = LZMA_FILTER_IA64; 1103 fi++; 1104 break; 1105 case _7Z_ARM: 1106 filters[fi].id = LZMA_FILTER_ARM; 1107 fi++; 1108 break; 1109 case _7Z_ARMTHUMB: 1110 filters[fi].id = LZMA_FILTER_ARMTHUMB; 1111 fi++; 1112 break; 1113 case _7Z_SPARC: 1114 filters[fi].id = LZMA_FILTER_SPARC; 1115 fi++; 1116 break; 1117 default: 1118 archive_set_error(&a->archive, 1119 ARCHIVE_ERRNO_MISC, 1120 "Unexpected codec ID: %lX", zip->codec2); 1121 return (ARCHIVE_FAILED); 1122 } 1123 } 1124 1125 if (zip->codec == _7Z_LZMA2) 1126 filters[fi].id = LZMA_FILTER_LZMA2; 1127 else 1128 filters[fi].id = LZMA_FILTER_LZMA1; 1129 filters[fi].options = NULL; 1130 ff = &filters[fi]; 1131 r = lzma_properties_decode(&filters[fi], NULL, 1132 coder1->properties, (size_t)coder1->propertiesSize); 1133 if (r != LZMA_OK) { 1134 set_error(a, r); 1135 return (ARCHIVE_FAILED); 1136 } 1137 fi++; 1138 1139 filters[fi].id = LZMA_VLI_UNKNOWN; 1140 filters[fi].options = NULL; 1141 r = lzma_raw_decoder(&(zip->lzstream), filters); 1142 free(ff->options); 1143 if (r != LZMA_OK) { 1144 set_error(a, r); 1145 return (ARCHIVE_FAILED); 1146 } 1147 zip->lzstream_valid = 1; 1148 zip->lzstream.total_in = 0; 1149 zip->lzstream.total_out = 0; 1150 break; 1151 } 1152#else 1153 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1154 "LZMA codec is unsupported"); 1155 return (ARCHIVE_FAILED); 1156#endif 1157 case _7Z_BZ2: 1158#if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR) 1159 if (zip->bzstream_valid) { 1160 BZ2_bzDecompressEnd(&(zip->bzstream)); 1161 zip->bzstream_valid = 0; 1162 } 1163 r = BZ2_bzDecompressInit(&(zip->bzstream), 0, 0); 1164 if (r == BZ_MEM_ERROR) 1165 r = BZ2_bzDecompressInit(&(zip->bzstream), 0, 1); 1166 if (r != BZ_OK) { 1167 int err = ARCHIVE_ERRNO_MISC; 1168 const char *detail = NULL; 1169 switch (r) { 1170 case BZ_PARAM_ERROR: 1171 detail = "invalid setup parameter"; 1172 break; 1173 case BZ_MEM_ERROR: 1174 err = ENOMEM; 1175 detail = "out of memory"; 1176 break; 1177 case BZ_CONFIG_ERROR: 1178 detail = "mis-compiled library"; 1179 break; 1180 } 1181 archive_set_error(&a->archive, err, 1182 "Internal error initializing decompressor: %s", 1183 detail != NULL ? detail : "??"); 1184 zip->bzstream_valid = 0; 1185 return (ARCHIVE_FAILED); 1186 } 1187 zip->bzstream_valid = 1; 1188 zip->bzstream.total_in_lo32 = 0; 1189 zip->bzstream.total_in_hi32 = 0; 1190 zip->bzstream.total_out_lo32 = 0; 1191 zip->bzstream.total_out_hi32 = 0; 1192 break; 1193#else 1194 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1195 "BZ2 codec is unsupported"); 1196 return (ARCHIVE_FAILED); 1197#endif 1198 case _7Z_DEFLATE: 1199#ifdef HAVE_ZLIB_H 1200 if (zip->stream_valid) 1201 r = inflateReset(&(zip->stream)); 1202 else 1203 r = inflateInit2(&(zip->stream), 1204 -15 /* Don't check for zlib header */); 1205 if (r != Z_OK) { 1206 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1207 "Couldn't initialize zlib stream."); 1208 return (ARCHIVE_FAILED); 1209 } 1210 zip->stream_valid = 1; 1211 zip->stream.total_in = 0; 1212 zip->stream.total_out = 0; 1213 break; 1214#else 1215 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1216 "DEFLATE codec is unsupported"); 1217 return (ARCHIVE_FAILED); 1218#endif 1219 case _7Z_PPMD: 1220 { 1221 unsigned order; 1222 uint32_t msize; 1223 1224 if (zip->ppmd7_valid) { 1225 __archive_ppmd7_functions.Ppmd7_Free( 1226 &zip->ppmd7_context); 1227 zip->ppmd7_valid = 0; 1228 } 1229 1230 if (coder1->propertiesSize < 5) { 1231 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1232 "Malformed PPMd parameter"); 1233 return (ARCHIVE_FAILED); 1234 } 1235 order = coder1->properties[0]; 1236 msize = archive_le32dec(&(coder1->properties[1])); 1237 if (order < PPMD7_MIN_ORDER || order > PPMD7_MAX_ORDER || 1238 msize < PPMD7_MIN_MEM_SIZE || msize > PPMD7_MAX_MEM_SIZE) { 1239 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1240 "Malformed PPMd parameter"); 1241 return (ARCHIVE_FAILED); 1242 } 1243 __archive_ppmd7_functions.Ppmd7_Construct(&zip->ppmd7_context); 1244 r = __archive_ppmd7_functions.Ppmd7_Alloc( 1245 &zip->ppmd7_context, msize); 1246 if (r == 0) { 1247 archive_set_error(&a->archive, ENOMEM, 1248 "Coludn't allocate memory for PPMd"); 1249 return (ARCHIVE_FATAL); 1250 } 1251 __archive_ppmd7_functions.Ppmd7_Init( 1252 &zip->ppmd7_context, order); 1253 __archive_ppmd7_functions.Ppmd7z_RangeDec_CreateVTable( 1254 &zip->range_dec); 1255 zip->ppmd7_valid = 1; 1256 zip->ppmd7_stat = 0; 1257 zip->ppstream.overconsumed = 0; 1258 zip->ppstream.total_in = 0; 1259 zip->ppstream.total_out = 0; 1260 break; 1261 } 1262 case _7Z_X86: 1263 case _7Z_X86_BCJ2: 1264 case _7Z_POWERPC: 1265 case _7Z_IA64: 1266 case _7Z_ARM: 1267 case _7Z_ARMTHUMB: 1268 case _7Z_SPARC: 1269 case _7Z_DELTA: 1270 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1271 "Unexpected codec ID: %lX", zip->codec); 1272 return (ARCHIVE_FAILED); 1273 case _7Z_CRYPTO_MAIN_ZIP: 1274 case _7Z_CRYPTO_RAR_29: 1275 case _7Z_CRYPTO_AES_256_SHA_256: 1276 if (a->entry) { 1277 archive_entry_set_is_metadata_encrypted(a->entry, 1); 1278 archive_entry_set_is_data_encrypted(a->entry, 1); 1279 zip->has_encrypted_entries = 1; 1280 } 1281 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1282 "Crypto codec not supported yet (ID: 0x%lX)", zip->codec); 1283 return (ARCHIVE_FAILED); 1284 default: 1285 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1286 "Unknown codec ID: %lX", zip->codec); 1287 return (ARCHIVE_FAILED); 1288 } 1289 1290 return (ARCHIVE_OK); 1291} 1292 1293static int 1294decompress(struct archive_read *a, struct _7zip *zip, 1295 void *buff, size_t *outbytes, const void *b, size_t *used) 1296{ 1297 const uint8_t *t_next_in; 1298 uint8_t *t_next_out; 1299 size_t o_avail_in, o_avail_out; 1300 size_t t_avail_in, t_avail_out; 1301 uint8_t *bcj2_next_out; 1302 size_t bcj2_avail_out; 1303 int r, ret = ARCHIVE_OK; 1304 1305 t_avail_in = o_avail_in = *used; 1306 t_avail_out = o_avail_out = *outbytes; 1307 t_next_in = b; 1308 t_next_out = buff; 1309 1310 if (zip->codec != _7Z_LZMA2 && zip->codec2 == _7Z_X86) { 1311 int i; 1312 1313 /* Do not copy out the BCJ remaining bytes when the output 1314 * buffer size is less than five bytes. */ 1315 if (o_avail_in != 0 && t_avail_out < 5 && zip->odd_bcj_size) { 1316 *used = 0; 1317 *outbytes = 0; 1318 return (ret); 1319 } 1320 for (i = 0; zip->odd_bcj_size > 0 && t_avail_out; i++) { 1321 *t_next_out++ = zip->odd_bcj[i]; 1322 t_avail_out--; 1323 zip->odd_bcj_size--; 1324 } 1325 if (o_avail_in == 0 || t_avail_out == 0) { 1326 *used = o_avail_in - t_avail_in; 1327 *outbytes = o_avail_out - t_avail_out; 1328 if (o_avail_in == 0) 1329 ret = ARCHIVE_EOF; 1330 return (ret); 1331 } 1332 } 1333 1334 bcj2_next_out = t_next_out; 1335 bcj2_avail_out = t_avail_out; 1336 if (zip->codec2 == _7Z_X86_BCJ2) { 1337 /* 1338 * Decord a remaining decompressed main stream for BCJ2. 1339 */ 1340 if (zip->tmp_stream_bytes_remaining) { 1341 ssize_t bytes; 1342 size_t remaining = zip->tmp_stream_bytes_remaining; 1343 bytes = Bcj2_Decode(zip, t_next_out, t_avail_out); 1344 if (bytes < 0) { 1345 archive_set_error(&(a->archive), 1346 ARCHIVE_ERRNO_MISC, 1347 "BCJ2 conversion Failed"); 1348 return (ARCHIVE_FAILED); 1349 } 1350 zip->main_stream_bytes_remaining -= 1351 remaining - zip->tmp_stream_bytes_remaining; 1352 t_avail_out -= bytes; 1353 if (o_avail_in == 0 || t_avail_out == 0) { 1354 *used = 0; 1355 *outbytes = o_avail_out - t_avail_out; 1356 if (o_avail_in == 0 && 1357 zip->tmp_stream_bytes_remaining) 1358 ret = ARCHIVE_EOF; 1359 return (ret); 1360 } 1361 t_next_out += bytes; 1362 bcj2_next_out = t_next_out; 1363 bcj2_avail_out = t_avail_out; 1364 } 1365 t_next_out = zip->tmp_stream_buff; 1366 t_avail_out = zip->tmp_stream_buff_size; 1367 } 1368 1369 switch (zip->codec) { 1370 case _7Z_COPY: 1371 { 1372 size_t bytes = 1373 (t_avail_in > t_avail_out)?t_avail_out:t_avail_in; 1374 1375 memcpy(t_next_out, t_next_in, bytes); 1376 t_avail_in -= bytes; 1377 t_avail_out -= bytes; 1378 if (o_avail_in == 0) 1379 ret = ARCHIVE_EOF; 1380 break; 1381 } 1382#ifdef HAVE_LZMA_H 1383 case _7Z_LZMA: case _7Z_LZMA2: 1384 zip->lzstream.next_in = t_next_in; 1385 zip->lzstream.avail_in = t_avail_in; 1386 zip->lzstream.next_out = t_next_out; 1387 zip->lzstream.avail_out = t_avail_out; 1388 1389 r = lzma_code(&(zip->lzstream), LZMA_RUN); 1390 switch (r) { 1391 case LZMA_STREAM_END: /* Found end of stream. */ 1392 lzma_end(&(zip->lzstream)); 1393 zip->lzstream_valid = 0; 1394 ret = ARCHIVE_EOF; 1395 break; 1396 case LZMA_OK: /* Decompressor made some progress. */ 1397 break; 1398 default: 1399 archive_set_error(&(a->archive), 1400 ARCHIVE_ERRNO_MISC, 1401 "Decompression failed(%d)", 1402 r); 1403 return (ARCHIVE_FAILED); 1404 } 1405 t_avail_in = zip->lzstream.avail_in; 1406 t_avail_out = zip->lzstream.avail_out; 1407 break; 1408#endif 1409#if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR) 1410 case _7Z_BZ2: 1411 zip->bzstream.next_in = (char *)(uintptr_t)t_next_in; 1412 zip->bzstream.avail_in = t_avail_in; 1413 zip->bzstream.next_out = (char *)(uintptr_t)t_next_out; 1414 zip->bzstream.avail_out = t_avail_out; 1415 r = BZ2_bzDecompress(&(zip->bzstream)); 1416 switch (r) { 1417 case BZ_STREAM_END: /* Found end of stream. */ 1418 switch (BZ2_bzDecompressEnd(&(zip->bzstream))) { 1419 case BZ_OK: 1420 break; 1421 default: 1422 archive_set_error(&(a->archive), 1423 ARCHIVE_ERRNO_MISC, 1424 "Failed to clean up decompressor"); 1425 return (ARCHIVE_FAILED); 1426 } 1427 zip->bzstream_valid = 0; 1428 ret = ARCHIVE_EOF; 1429 break; 1430 case BZ_OK: /* Decompressor made some progress. */ 1431 break; 1432 default: 1433 archive_set_error(&(a->archive), 1434 ARCHIVE_ERRNO_MISC, 1435 "bzip decompression failed"); 1436 return (ARCHIVE_FAILED); 1437 } 1438 t_avail_in = zip->bzstream.avail_in; 1439 t_avail_out = zip->bzstream.avail_out; 1440 break; 1441#endif 1442#ifdef HAVE_ZLIB_H 1443 case _7Z_DEFLATE: 1444 zip->stream.next_in = (Bytef *)(uintptr_t)t_next_in; 1445 zip->stream.avail_in = (uInt)t_avail_in; 1446 zip->stream.next_out = t_next_out; 1447 zip->stream.avail_out = (uInt)t_avail_out; 1448 r = inflate(&(zip->stream), 0); 1449 switch (r) { 1450 case Z_STREAM_END: /* Found end of stream. */ 1451 ret = ARCHIVE_EOF; 1452 break; 1453 case Z_OK: /* Decompressor made some progress.*/ 1454 break; 1455 default: 1456 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1457 "File decompression failed (%d)", r); 1458 return (ARCHIVE_FAILED); 1459 } 1460 t_avail_in = zip->stream.avail_in; 1461 t_avail_out = zip->stream.avail_out; 1462 break; 1463#endif 1464 case _7Z_PPMD: 1465 { 1466 uint64_t flush_bytes; 1467 1468 if (!zip->ppmd7_valid || zip->ppmd7_stat < 0 || 1469 t_avail_out <= 0) { 1470 archive_set_error(&(a->archive), 1471 ARCHIVE_ERRNO_MISC, 1472 "Decompression internal error"); 1473 return (ARCHIVE_FAILED); 1474 } 1475 zip->ppstream.next_in = t_next_in; 1476 zip->ppstream.avail_in = t_avail_in; 1477 zip->ppstream.next_out = t_next_out; 1478 zip->ppstream.avail_out = t_avail_out; 1479 if (zip->ppmd7_stat == 0) { 1480 zip->bytein.a = a; 1481 zip->bytein.Read = &ppmd_read; 1482 zip->range_dec.Stream = &zip->bytein; 1483 r = __archive_ppmd7_functions.Ppmd7z_RangeDec_Init( 1484 &(zip->range_dec)); 1485 if (r == 0) { 1486 zip->ppmd7_stat = -1; 1487 archive_set_error(&a->archive, 1488 ARCHIVE_ERRNO_MISC, 1489 "Failed to initialize PPMd range decorder"); 1490 return (ARCHIVE_FAILED); 1491 } 1492 if (zip->ppstream.overconsumed) { 1493 zip->ppmd7_stat = -1; 1494 return (ARCHIVE_FAILED); 1495 } 1496 zip->ppmd7_stat = 1; 1497 } 1498 1499 if (t_avail_in == 0) 1500 /* XXX Flush out remaining decoded data XXX */ 1501 flush_bytes = zip->folder_outbytes_remaining; 1502 else 1503 flush_bytes = 0; 1504 1505 do { 1506 int sym; 1507 1508 sym = __archive_ppmd7_functions.Ppmd7_DecodeSymbol( 1509 &(zip->ppmd7_context), &(zip->range_dec.p)); 1510 if (sym < 0) { 1511 zip->ppmd7_stat = -1; 1512 archive_set_error(&a->archive, 1513 ARCHIVE_ERRNO_FILE_FORMAT, 1514 "Failed to decode PPMd"); 1515 return (ARCHIVE_FAILED); 1516 } 1517 if (zip->ppstream.overconsumed) { 1518 zip->ppmd7_stat = -1; 1519 return (ARCHIVE_FAILED); 1520 } 1521 *zip->ppstream.next_out++ = (unsigned char)sym; 1522 zip->ppstream.avail_out--; 1523 zip->ppstream.total_out++; 1524 if (flush_bytes) 1525 flush_bytes--; 1526 } while (zip->ppstream.avail_out && 1527 (zip->ppstream.avail_in || flush_bytes)); 1528 1529 t_avail_in = (size_t)zip->ppstream.avail_in; 1530 t_avail_out = (size_t)zip->ppstream.avail_out; 1531 break; 1532 } 1533 default: 1534 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, 1535 "Decompression internal error"); 1536 return (ARCHIVE_FAILED); 1537 } 1538 if (ret != ARCHIVE_OK && ret != ARCHIVE_EOF) 1539 return (ret); 1540 1541 *used = o_avail_in - t_avail_in; 1542 *outbytes = o_avail_out - t_avail_out; 1543 1544 /* 1545 * Decord BCJ. 1546 */ 1547 if (zip->codec != _7Z_LZMA2 && zip->codec2 == _7Z_X86) { 1548 size_t l = x86_Convert(zip, buff, *outbytes); 1549 zip->odd_bcj_size = *outbytes - l; 1550 if (zip->odd_bcj_size > 0 && zip->odd_bcj_size <= 4 && 1551 o_avail_in && ret != ARCHIVE_EOF) { 1552 memcpy(zip->odd_bcj, ((unsigned char *)buff) + l, 1553 zip->odd_bcj_size); 1554 *outbytes = l; 1555 } else 1556 zip->odd_bcj_size = 0; 1557 } 1558 1559 /* 1560 * Decord BCJ2 with a decompressed main stream. 1561 */ 1562 if (zip->codec2 == _7Z_X86_BCJ2) { 1563 ssize_t bytes; 1564 1565 zip->tmp_stream_bytes_avail = 1566 zip->tmp_stream_buff_size - t_avail_out; 1567 if (zip->tmp_stream_bytes_avail > 1568 zip->main_stream_bytes_remaining) 1569 zip->tmp_stream_bytes_avail = 1570 zip->main_stream_bytes_remaining; 1571 zip->tmp_stream_bytes_remaining = zip->tmp_stream_bytes_avail; 1572 bytes = Bcj2_Decode(zip, bcj2_next_out, bcj2_avail_out); 1573 if (bytes < 0) { 1574 archive_set_error(&(a->archive), 1575 ARCHIVE_ERRNO_MISC, "BCJ2 conversion Failed"); 1576 return (ARCHIVE_FAILED); 1577 } 1578 zip->main_stream_bytes_remaining -= 1579 zip->tmp_stream_bytes_avail 1580 - zip->tmp_stream_bytes_remaining; 1581 bcj2_avail_out -= bytes; 1582 *outbytes = o_avail_out - bcj2_avail_out; 1583 } 1584 1585 return (ret); 1586} 1587 1588static int 1589free_decompression(struct archive_read *a, struct _7zip *zip) 1590{ 1591 int r = ARCHIVE_OK; 1592 1593#if !defined(HAVE_ZLIB_H) &&\ 1594 !(defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)) 1595 (void)a;/* UNUSED */ 1596#endif 1597#ifdef HAVE_LZMA_H 1598 if (zip->lzstream_valid) 1599 lzma_end(&(zip->lzstream)); 1600#endif 1601#if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR) 1602 if (zip->bzstream_valid) { 1603 if (BZ2_bzDecompressEnd(&(zip->bzstream)) != BZ_OK) { 1604 archive_set_error(&a->archive, 1605 ARCHIVE_ERRNO_MISC, 1606 "Failed to clean up bzip2 decompressor"); 1607 r = ARCHIVE_FATAL; 1608 } 1609 zip->bzstream_valid = 0; 1610 } 1611#endif 1612#ifdef HAVE_ZLIB_H 1613 if (zip->stream_valid) { 1614 if (inflateEnd(&(zip->stream)) != Z_OK) { 1615 archive_set_error(&a->archive, 1616 ARCHIVE_ERRNO_MISC, 1617 "Failed to clean up zlib decompressor"); 1618 r = ARCHIVE_FATAL; 1619 } 1620 zip->stream_valid = 0; 1621 } 1622#endif 1623 if (zip->ppmd7_valid) { 1624 __archive_ppmd7_functions.Ppmd7_Free( 1625 &zip->ppmd7_context); 1626 zip->ppmd7_valid = 0; 1627 } 1628 return (r); 1629} 1630 1631static int 1632parse_7zip_uint64(struct archive_read *a, uint64_t *val) 1633{ 1634 const unsigned char *p; 1635 unsigned char avail, mask; 1636 int i; 1637 1638 if ((p = header_bytes(a, 1)) == NULL) 1639 return (-1); 1640 avail = *p; 1641 mask = 0x80; 1642 *val = 0; 1643 for (i = 0; i < 8; i++) { 1644 if (avail & mask) { 1645 if ((p = header_bytes(a, 1)) == NULL) 1646 return (-1); 1647 *val |= ((uint64_t)*p) << (8 * i); 1648 mask >>= 1; 1649 continue; 1650 } 1651 *val += ((uint64_t)(avail & (mask -1))) << (8 * i); 1652 break; 1653 } 1654 return (0); 1655} 1656 1657static int 1658read_Bools(struct archive_read *a, unsigned char *data, size_t num) 1659{ 1660 const unsigned char *p; 1661 unsigned i, mask = 0, avail = 0; 1662 1663 for (i = 0; i < num; i++) { 1664 if (mask == 0) { 1665 if ((p = header_bytes(a, 1)) == NULL) 1666 return (-1); 1667 avail = *p; 1668 mask = 0x80; 1669 } 1670 data[i] = (avail & mask)?1:0; 1671 mask >>= 1; 1672 } 1673 return (0); 1674} 1675 1676static void 1677free_Digest(struct _7z_digests *d) 1678{ 1679 free(d->defineds); 1680 free(d->digests); 1681} 1682 1683static int 1684read_Digests(struct archive_read *a, struct _7z_digests *d, size_t num) 1685{ 1686 const unsigned char *p; 1687 unsigned i; 1688 1689 if (num == 0) 1690 return (-1); 1691 memset(d, 0, sizeof(*d)); 1692 1693 d->defineds = malloc(num); 1694 if (d->defineds == NULL) 1695 return (-1); 1696 /* 1697 * Read Bools. 1698 */ 1699 if ((p = header_bytes(a, 1)) == NULL) 1700 return (-1); 1701 if (*p == 0) { 1702 if (read_Bools(a, d->defineds, num) < 0) 1703 return (-1); 1704 } else 1705 /* All are defined */ 1706 memset(d->defineds, 1, num); 1707 1708 d->digests = calloc(num, sizeof(*d->digests)); 1709 if (d->digests == NULL) 1710 return (-1); 1711 for (i = 0; i < num; i++) { 1712 if (d->defineds[i]) { 1713 if ((p = header_bytes(a, 4)) == NULL) 1714 return (-1); 1715 d->digests[i] = archive_le32dec(p); 1716 } 1717 } 1718 1719 return (0); 1720} 1721 1722static void 1723free_PackInfo(struct _7z_pack_info *pi) 1724{ 1725 free(pi->sizes); 1726 free(pi->positions); 1727 free_Digest(&(pi->digest)); 1728} 1729 1730static int 1731read_PackInfo(struct archive_read *a, struct _7z_pack_info *pi) 1732{ 1733 const unsigned char *p; 1734 unsigned i; 1735 1736 memset(pi, 0, sizeof(*pi)); 1737 1738 /* 1739 * Read PackPos. 1740 */ 1741 if (parse_7zip_uint64(a, &(pi->pos)) < 0) 1742 return (-1); 1743 1744 /* 1745 * Read NumPackStreams. 1746 */ 1747 if (parse_7zip_uint64(a, &(pi->numPackStreams)) < 0) 1748 return (-1); 1749 if (pi->numPackStreams == 0) 1750 return (-1); 1751 if (UMAX_ENTRY < pi->numPackStreams) 1752 return (-1); 1753 1754 /* 1755 * Read PackSizes[num] 1756 */ 1757 if ((p = header_bytes(a, 1)) == NULL) 1758 return (-1); 1759 if (*p == kEnd) 1760 /* PackSizes[num] are not present. */ 1761 return (0); 1762 if (*p != kSize) 1763 return (-1); 1764 pi->sizes = calloc((size_t)pi->numPackStreams, sizeof(uint64_t)); 1765 pi->positions = calloc((size_t)pi->numPackStreams, sizeof(uint64_t)); 1766 if (pi->sizes == NULL || pi->positions == NULL) 1767 return (-1); 1768 1769 for (i = 0; i < pi->numPackStreams; i++) { 1770 if (parse_7zip_uint64(a, &(pi->sizes[i])) < 0) 1771 return (-1); 1772 } 1773 1774 /* 1775 * Read PackStreamDigests[num] 1776 */ 1777 if ((p = header_bytes(a, 1)) == NULL) 1778 return (-1); 1779 if (*p == kEnd) { 1780 /* PackStreamDigests[num] are not present. */ 1781 pi->digest.defineds = 1782 calloc((size_t)pi->numPackStreams, sizeof(*pi->digest.defineds)); 1783 pi->digest.digests = 1784 calloc((size_t)pi->numPackStreams, sizeof(*pi->digest.digests)); 1785 if (pi->digest.defineds == NULL || pi->digest.digests == NULL) 1786 return (-1); 1787 return (0); 1788 } 1789 1790 if (*p != kSize) 1791 return (-1); 1792 1793 if (read_Digests(a, &(pi->digest), (size_t)pi->numPackStreams) < 0) 1794 return (-1); 1795 1796 /* 1797 * Must be marked by kEnd. 1798 */ 1799 if ((p = header_bytes(a, 1)) == NULL) 1800 return (-1); 1801 if (*p != kEnd) 1802 return (-1); 1803 return (0); 1804} 1805 1806static void 1807free_Folder(struct _7z_folder *f) 1808{ 1809 unsigned i; 1810 1811 if (f->coders) { 1812 for (i = 0; i< f->numCoders; i++) { 1813 free(f->coders[i].properties); 1814 } 1815 free(f->coders); 1816 } 1817 free(f->bindPairs); 1818 free(f->packedStreams); 1819 free(f->unPackSize); 1820} 1821 1822static int 1823read_Folder(struct archive_read *a, struct _7z_folder *f) 1824{ 1825 struct _7zip *zip = (struct _7zip *)a->format->data; 1826 const unsigned char *p; 1827 uint64_t numInStreamsTotal = 0; 1828 uint64_t numOutStreamsTotal = 0; 1829 unsigned i; 1830 1831 memset(f, 0, sizeof(*f)); 1832 1833 /* 1834 * Read NumCoders. 1835 */ 1836 if (parse_7zip_uint64(a, &(f->numCoders)) < 0) 1837 return (-1); 1838 if (f->numCoders > 4) 1839 /* Too many coders. */ 1840 return (-1); 1841 1842 f->coders = calloc((size_t)f->numCoders, sizeof(*f->coders)); 1843 if (f->coders == NULL) 1844 return (-1); 1845 for (i = 0; i< f->numCoders; i++) { 1846 size_t codec_size; 1847 int simple, attr; 1848 1849 if ((p = header_bytes(a, 1)) == NULL) 1850 return (-1); 1851 /* 1852 * 0:3 CodecIdSize 1853 * 4: 0 - IsSimple 1854 * 1 - Is not Simple 1855 * 5: 0 - No Attributes 1856 * 1 - There are Attributes; 1857 * 7: Must be zero. 1858 */ 1859 codec_size = *p & 0xf; 1860 simple = (*p & 0x10)?0:1; 1861 attr = *p & 0x20; 1862 if (*p & 0x80) 1863 return (-1);/* Not supported. */ 1864 1865 /* 1866 * Read Decompression Method IDs. 1867 */ 1868 if ((p = header_bytes(a, codec_size)) == NULL) 1869 return (-1); 1870 1871 f->coders[i].codec = decode_codec_id(p, codec_size); 1872 1873 if (simple) { 1874 f->coders[i].numInStreams = 1; 1875 f->coders[i].numOutStreams = 1; 1876 } else { 1877 if (parse_7zip_uint64( 1878 a, &(f->coders[i].numInStreams)) < 0) 1879 return (-1); 1880 if (UMAX_ENTRY < f->coders[i].numInStreams) 1881 return (-1); 1882 if (parse_7zip_uint64( 1883 a, &(f->coders[i].numOutStreams)) < 0) 1884 return (-1); 1885 if (UMAX_ENTRY < f->coders[i].numOutStreams) 1886 return (-1); 1887 } 1888 1889 if (attr) { 1890 if (parse_7zip_uint64( 1891 a, &(f->coders[i].propertiesSize)) < 0) 1892 return (-1); 1893 if ((p = header_bytes( 1894 a, (size_t)f->coders[i].propertiesSize)) == NULL) 1895 return (-1); 1896 f->coders[i].properties = 1897 malloc((size_t)f->coders[i].propertiesSize); 1898 if (f->coders[i].properties == NULL) 1899 return (-1); 1900 memcpy(f->coders[i].properties, p, 1901 (size_t)f->coders[i].propertiesSize); 1902 } 1903 1904 numInStreamsTotal += f->coders[i].numInStreams; 1905 numOutStreamsTotal += f->coders[i].numOutStreams; 1906 } 1907 1908 if (numOutStreamsTotal == 0 || 1909 numInStreamsTotal < numOutStreamsTotal-1) 1910 return (-1); 1911 1912 f->numBindPairs = numOutStreamsTotal - 1; 1913 if (zip->header_bytes_remaining < f->numBindPairs) 1914 return (-1); 1915 if (f->numBindPairs > 0) { 1916 f->bindPairs = 1917 calloc((size_t)f->numBindPairs, sizeof(*f->bindPairs)); 1918 if (f->bindPairs == NULL) 1919 return (-1); 1920 } else 1921 f->bindPairs = NULL; 1922 for (i = 0; i < f->numBindPairs; i++) { 1923 if (parse_7zip_uint64(a, &(f->bindPairs[i].inIndex)) < 0) 1924 return (-1); 1925 if (UMAX_ENTRY < f->bindPairs[i].inIndex) 1926 return (-1); 1927 if (parse_7zip_uint64(a, &(f->bindPairs[i].outIndex)) < 0) 1928 return (-1); 1929 if (UMAX_ENTRY < f->bindPairs[i].outIndex) 1930 return (-1); 1931 } 1932 1933 f->numPackedStreams = numInStreamsTotal - f->numBindPairs; 1934 f->packedStreams = 1935 calloc((size_t)f->numPackedStreams, sizeof(*f->packedStreams)); 1936 if (f->packedStreams == NULL) 1937 return (-1); 1938 if (f->numPackedStreams == 1) { 1939 for (i = 0; i < numInStreamsTotal; i++) { 1940 unsigned j; 1941 for (j = 0; j < f->numBindPairs; j++) { 1942 if (f->bindPairs[j].inIndex == i) 1943 break; 1944 } 1945 if (j == f->numBindPairs) 1946 break; 1947 } 1948 if (i == numInStreamsTotal) 1949 return (-1); 1950 f->packedStreams[0] = i; 1951 } else { 1952 for (i = 0; i < f->numPackedStreams; i++) { 1953 if (parse_7zip_uint64(a, &(f->packedStreams[i])) < 0) 1954 return (-1); 1955 if (UMAX_ENTRY < f->packedStreams[i]) 1956 return (-1); 1957 } 1958 } 1959 f->numInStreams = numInStreamsTotal; 1960 f->numOutStreams = numOutStreamsTotal; 1961 1962 return (0); 1963} 1964 1965static void 1966free_CodersInfo(struct _7z_coders_info *ci) 1967{ 1968 unsigned i; 1969 1970 if (ci->folders) { 1971 for (i = 0; i < ci->numFolders; i++) 1972 free_Folder(&(ci->folders[i])); 1973 free(ci->folders); 1974 } 1975} 1976 1977static int 1978read_CodersInfo(struct archive_read *a, struct _7z_coders_info *ci) 1979{ 1980 const unsigned char *p; 1981 struct _7z_digests digest; 1982 unsigned i; 1983 1984 memset(ci, 0, sizeof(*ci)); 1985 memset(&digest, 0, sizeof(digest)); 1986 1987 if ((p = header_bytes(a, 1)) == NULL) 1988 goto failed; 1989 if (*p != kFolder) 1990 goto failed; 1991 1992 /* 1993 * Read NumFolders. 1994 */ 1995 if (parse_7zip_uint64(a, &(ci->numFolders)) < 0) 1996 goto failed; 1997 if (UMAX_ENTRY < ci->numFolders) 1998 return (-1); 1999 2000 /* 2001 * Read External. 2002 */ 2003 if ((p = header_bytes(a, 1)) == NULL) 2004 goto failed; 2005 switch (*p) { 2006 case 0: 2007 ci->folders = 2008 calloc((size_t)ci->numFolders, sizeof(*ci->folders)); 2009 if (ci->folders == NULL) 2010 return (-1); 2011 for (i = 0; i < ci->numFolders; i++) { 2012 if (read_Folder(a, &(ci->folders[i])) < 0) 2013 goto failed; 2014 } 2015 break; 2016 case 1: 2017 if (parse_7zip_uint64(a, &(ci->dataStreamIndex)) < 0) 2018 return (-1); 2019 if (UMAX_ENTRY < ci->dataStreamIndex) 2020 return (-1); 2021 if (ci->numFolders > 0) { 2022 archive_set_error(&a->archive, -1, 2023 "Malformed 7-Zip archive"); 2024 goto failed; 2025 } 2026 break; 2027 default: 2028 archive_set_error(&a->archive, -1, 2029 "Malformed 7-Zip archive"); 2030 goto failed; 2031 } 2032 2033 if ((p = header_bytes(a, 1)) == NULL) 2034 goto failed; 2035 if (*p != kCodersUnPackSize) 2036 goto failed; 2037 2038 for (i = 0; i < ci->numFolders; i++) { 2039 struct _7z_folder *folder = &(ci->folders[i]); 2040 unsigned j; 2041 2042 folder->unPackSize = 2043 calloc((size_t)folder->numOutStreams, sizeof(*folder->unPackSize)); 2044 if (folder->unPackSize == NULL) 2045 goto failed; 2046 for (j = 0; j < folder->numOutStreams; j++) { 2047 if (parse_7zip_uint64(a, &(folder->unPackSize[j])) < 0) 2048 goto failed; 2049 } 2050 } 2051 2052 /* 2053 * Read CRCs. 2054 */ 2055 if ((p = header_bytes(a, 1)) == NULL) 2056 goto failed; 2057 if (*p == kEnd) 2058 return (0); 2059 if (*p != kCRC) 2060 goto failed; 2061 if (read_Digests(a, &digest, (size_t)ci->numFolders) < 0) 2062 goto failed; 2063 for (i = 0; i < ci->numFolders; i++) { 2064 ci->folders[i].digest_defined = digest.defineds[i]; 2065 ci->folders[i].digest = digest.digests[i]; 2066 } 2067 2068 /* 2069 * Must be kEnd. 2070 */ 2071 if ((p = header_bytes(a, 1)) == NULL) 2072 goto failed; 2073 if (*p != kEnd) 2074 goto failed; 2075 free_Digest(&digest); 2076 return (0); 2077failed: 2078 free_Digest(&digest); 2079 return (-1); 2080} 2081 2082static uint64_t 2083folder_uncompressed_size(struct _7z_folder *f) 2084{ 2085 int n = (int)f->numOutStreams; 2086 unsigned pairs = (unsigned)f->numBindPairs; 2087 2088 while (--n >= 0) { 2089 unsigned i; 2090 for (i = 0; i < pairs; i++) { 2091 if (f->bindPairs[i].outIndex == (uint64_t)n) 2092 break; 2093 } 2094 if (i >= pairs) 2095 return (f->unPackSize[n]); 2096 } 2097 return (0); 2098} 2099 2100static void 2101free_SubStreamsInfo(struct _7z_substream_info *ss) 2102{ 2103 free(ss->unpackSizes); 2104 free(ss->digestsDefined); 2105 free(ss->digests); 2106} 2107 2108static int 2109read_SubStreamsInfo(struct archive_read *a, struct _7z_substream_info *ss, 2110 struct _7z_folder *f, size_t numFolders) 2111{ 2112 const unsigned char *p; 2113 uint64_t *usizes; 2114 size_t unpack_streams; 2115 int type; 2116 unsigned i; 2117 uint32_t numDigests; 2118 2119 memset(ss, 0, sizeof(*ss)); 2120 2121 for (i = 0; i < numFolders; i++) 2122 f[i].numUnpackStreams = 1; 2123 2124 if ((p = header_bytes(a, 1)) == NULL) 2125 return (-1); 2126 type = *p; 2127 2128 if (type == kNumUnPackStream) { 2129 unpack_streams = 0; 2130 for (i = 0; i < numFolders; i++) { 2131 if (parse_7zip_uint64(a, &(f[i].numUnpackStreams)) < 0) 2132 return (-1); 2133 if (UMAX_ENTRY < f[i].numUnpackStreams) 2134 return (-1); 2135 if (unpack_streams > SIZE_MAX - UMAX_ENTRY) { 2136 return (-1); 2137 } 2138 unpack_streams += (size_t)f[i].numUnpackStreams; 2139 } 2140 if ((p = header_bytes(a, 1)) == NULL) 2141 return (-1); 2142 type = *p; 2143 } else 2144 unpack_streams = numFolders; 2145 2146 ss->unpack_streams = unpack_streams; 2147 if (unpack_streams) { 2148 ss->unpackSizes = calloc(unpack_streams, 2149 sizeof(*ss->unpackSizes)); 2150 ss->digestsDefined = calloc(unpack_streams, 2151 sizeof(*ss->digestsDefined)); 2152 ss->digests = calloc(unpack_streams, 2153 sizeof(*ss->digests)); 2154 if (ss->unpackSizes == NULL || ss->digestsDefined == NULL || 2155 ss->digests == NULL) 2156 return (-1); 2157 } 2158 2159 usizes = ss->unpackSizes; 2160 for (i = 0; i < numFolders; i++) { 2161 unsigned pack; 2162 uint64_t sum; 2163 2164 if (f[i].numUnpackStreams == 0) 2165 continue; 2166 2167 sum = 0; 2168 if (type == kSize) { 2169 for (pack = 1; pack < f[i].numUnpackStreams; pack++) { 2170 if (parse_7zip_uint64(a, usizes) < 0) 2171 return (-1); 2172 sum += *usizes++; 2173 } 2174 } 2175 *usizes++ = folder_uncompressed_size(&f[i]) - sum; 2176 } 2177 2178 if (type == kSize) { 2179 if ((p = header_bytes(a, 1)) == NULL) 2180 return (-1); 2181 type = *p; 2182 } 2183 2184 for (i = 0; i < unpack_streams; i++) { 2185 ss->digestsDefined[i] = 0; 2186 ss->digests[i] = 0; 2187 } 2188 2189 numDigests = 0; 2190 for (i = 0; i < numFolders; i++) { 2191 if (f[i].numUnpackStreams != 1 || !f[i].digest_defined) 2192 numDigests += (uint32_t)f[i].numUnpackStreams; 2193 } 2194 2195 if (type == kCRC) { 2196 struct _7z_digests tmpDigests; 2197 unsigned char *digestsDefined = ss->digestsDefined; 2198 uint32_t * digests = ss->digests; 2199 int di = 0; 2200 2201 memset(&tmpDigests, 0, sizeof(tmpDigests)); 2202 if (read_Digests(a, &(tmpDigests), numDigests) < 0) { 2203 free_Digest(&tmpDigests); 2204 return (-1); 2205 } 2206 for (i = 0; i < numFolders; i++) { 2207 if (f[i].numUnpackStreams == 1 && f[i].digest_defined) { 2208 *digestsDefined++ = 1; 2209 *digests++ = f[i].digest; 2210 } else { 2211 unsigned j; 2212 2213 for (j = 0; j < f[i].numUnpackStreams; 2214 j++, di++) { 2215 *digestsDefined++ = 2216 tmpDigests.defineds[di]; 2217 *digests++ = 2218 tmpDigests.digests[di]; 2219 } 2220 } 2221 } 2222 free_Digest(&tmpDigests); 2223 if ((p = header_bytes(a, 1)) == NULL) 2224 return (-1); 2225 type = *p; 2226 } 2227 2228 /* 2229 * Must be kEnd. 2230 */ 2231 if (type != kEnd) 2232 return (-1); 2233 return (0); 2234} 2235 2236static void 2237free_StreamsInfo(struct _7z_stream_info *si) 2238{ 2239 free_PackInfo(&(si->pi)); 2240 free_CodersInfo(&(si->ci)); 2241 free_SubStreamsInfo(&(si->ss)); 2242} 2243 2244static int 2245read_StreamsInfo(struct archive_read *a, struct _7z_stream_info *si) 2246{ 2247 struct _7zip *zip = (struct _7zip *)a->format->data; 2248 const unsigned char *p; 2249 unsigned i; 2250 2251 memset(si, 0, sizeof(*si)); 2252 2253 if ((p = header_bytes(a, 1)) == NULL) 2254 return (-1); 2255 if (*p == kPackInfo) { 2256 uint64_t packPos; 2257 2258 if (read_PackInfo(a, &(si->pi)) < 0) 2259 return (-1); 2260 2261 if (si->pi.positions == NULL || si->pi.sizes == NULL) 2262 return (-1); 2263 /* 2264 * Calculate packed stream positions. 2265 */ 2266 packPos = si->pi.pos; 2267 for (i = 0; i < si->pi.numPackStreams; i++) { 2268 si->pi.positions[i] = packPos; 2269 packPos += si->pi.sizes[i]; 2270 if (packPos > zip->header_offset) 2271 return (-1); 2272 } 2273 if ((p = header_bytes(a, 1)) == NULL) 2274 return (-1); 2275 } 2276 if (*p == kUnPackInfo) { 2277 uint32_t packIndex; 2278 struct _7z_folder *f; 2279 2280 if (read_CodersInfo(a, &(si->ci)) < 0) 2281 return (-1); 2282 2283 /* 2284 * Calculate packed stream indexes. 2285 */ 2286 packIndex = 0; 2287 f = si->ci.folders; 2288 for (i = 0; i < si->ci.numFolders; i++) { 2289 f[i].packIndex = packIndex; 2290 packIndex += (uint32_t)f[i].numPackedStreams; 2291 if (packIndex > si->pi.numPackStreams) 2292 return (-1); 2293 } 2294 if ((p = header_bytes(a, 1)) == NULL) 2295 return (-1); 2296 } 2297 2298 if (*p == kSubStreamsInfo) { 2299 if (read_SubStreamsInfo(a, &(si->ss), 2300 si->ci.folders, (size_t)si->ci.numFolders) < 0) 2301 return (-1); 2302 if ((p = header_bytes(a, 1)) == NULL) 2303 return (-1); 2304 } 2305 2306 /* 2307 * Must be kEnd. 2308 */ 2309 if (*p != kEnd) 2310 return (-1); 2311 return (0); 2312} 2313 2314static void 2315free_Header(struct _7z_header_info *h) 2316{ 2317 free(h->emptyStreamBools); 2318 free(h->emptyFileBools); 2319 free(h->antiBools); 2320 free(h->attrBools); 2321} 2322 2323static int 2324read_Header(struct archive_read *a, struct _7z_header_info *h, 2325 int check_header_id) 2326{ 2327 struct _7zip *zip = (struct _7zip *)a->format->data; 2328 const unsigned char *p; 2329 struct _7z_folder *folders; 2330 struct _7z_stream_info *si = &(zip->si); 2331 struct _7zip_entry *entries; 2332 uint32_t folderIndex, indexInFolder; 2333 unsigned i; 2334 int eindex, empty_streams, sindex; 2335 2336 if (check_header_id) { 2337 /* 2338 * Read Header. 2339 */ 2340 if ((p = header_bytes(a, 1)) == NULL) 2341 return (-1); 2342 if (*p != kHeader) 2343 return (-1); 2344 } 2345 2346 /* 2347 * Read ArchiveProperties. 2348 */ 2349 if ((p = header_bytes(a, 1)) == NULL) 2350 return (-1); 2351 if (*p == kArchiveProperties) { 2352 for (;;) { 2353 uint64_t size; 2354 if ((p = header_bytes(a, 1)) == NULL) 2355 return (-1); 2356 if (*p == 0) 2357 break; 2358 if (parse_7zip_uint64(a, &size) < 0) 2359 return (-1); 2360 } 2361 if ((p = header_bytes(a, 1)) == NULL) 2362 return (-1); 2363 } 2364 2365 /* 2366 * Read MainStreamsInfo. 2367 */ 2368 if (*p == kMainStreamsInfo) { 2369 if (read_StreamsInfo(a, &(zip->si)) < 0) 2370 return (-1); 2371 if ((p = header_bytes(a, 1)) == NULL) 2372 return (-1); 2373 } 2374 if (*p == kEnd) 2375 return (0); 2376 2377 /* 2378 * Read FilesInfo. 2379 */ 2380 if (*p != kFilesInfo) 2381 return (-1); 2382 2383 if (parse_7zip_uint64(a, &(zip->numFiles)) < 0) 2384 return (-1); 2385 if (UMAX_ENTRY < zip->numFiles) 2386 return (-1); 2387 2388 zip->entries = calloc((size_t)zip->numFiles, sizeof(*zip->entries)); 2389 if (zip->entries == NULL) 2390 return (-1); 2391 entries = zip->entries; 2392 2393 empty_streams = 0; 2394 for (;;) { 2395 int type; 2396 uint64_t size; 2397 size_t ll; 2398 2399 if ((p = header_bytes(a, 1)) == NULL) 2400 return (-1); 2401 type = *p; 2402 if (type == kEnd) 2403 break; 2404 2405 if (parse_7zip_uint64(a, &size) < 0) 2406 return (-1); 2407 if (zip->header_bytes_remaining < size) 2408 return (-1); 2409 ll = (size_t)size; 2410 2411 switch (type) { 2412 case kEmptyStream: 2413 if (h->emptyStreamBools != NULL) 2414 return (-1); 2415 h->emptyStreamBools = calloc((size_t)zip->numFiles, 2416 sizeof(*h->emptyStreamBools)); 2417 if (h->emptyStreamBools == NULL) 2418 return (-1); 2419 if (read_Bools( 2420 a, h->emptyStreamBools, (size_t)zip->numFiles) < 0) 2421 return (-1); 2422 empty_streams = 0; 2423 for (i = 0; i < zip->numFiles; i++) { 2424 if (h->emptyStreamBools[i]) 2425 empty_streams++; 2426 } 2427 break; 2428 case kEmptyFile: 2429 if (empty_streams <= 0) { 2430 /* Unexcepted sequence. Skip this. */ 2431 if (header_bytes(a, ll) == NULL) 2432 return (-1); 2433 break; 2434 } 2435 if (h->emptyFileBools != NULL) 2436 return (-1); 2437 h->emptyFileBools = calloc(empty_streams, 2438 sizeof(*h->emptyFileBools)); 2439 if (h->emptyFileBools == NULL) 2440 return (-1); 2441 if (read_Bools(a, h->emptyFileBools, empty_streams) < 0) 2442 return (-1); 2443 break; 2444 case kAnti: 2445 if (empty_streams <= 0) { 2446 /* Unexcepted sequence. Skip this. */ 2447 if (header_bytes(a, ll) == NULL) 2448 return (-1); 2449 break; 2450 } 2451 if (h->antiBools != NULL) 2452 return (-1); 2453 h->antiBools = calloc(empty_streams, 2454 sizeof(*h->antiBools)); 2455 if (h->antiBools == NULL) 2456 return (-1); 2457 if (read_Bools(a, h->antiBools, empty_streams) < 0) 2458 return (-1); 2459 break; 2460 case kCTime: 2461 case kATime: 2462 case kMTime: 2463 if (read_Times(a, h, type) < 0) 2464 return (-1); 2465 break; 2466 case kName: 2467 { 2468 unsigned char *np; 2469 size_t nl, nb; 2470 2471 /* Skip one byte. */ 2472 if ((p = header_bytes(a, 1)) == NULL) 2473 return (-1); 2474 ll--; 2475 2476 if ((ll & 1) || ll < zip->numFiles * 4) 2477 return (-1); 2478 2479 if (zip->entry_names != NULL) 2480 return (-1); 2481 zip->entry_names = malloc(ll); 2482 if (zip->entry_names == NULL) 2483 return (-1); 2484 np = zip->entry_names; 2485 nb = ll; 2486 /* 2487 * Copy whole file names. 2488 * NOTE: This loop prevents from expanding 2489 * the uncompressed buffer in order not to 2490 * use extra memory resource. 2491 */ 2492 while (nb) { 2493 size_t b; 2494 if (nb > UBUFF_SIZE) 2495 b = UBUFF_SIZE; 2496 else 2497 b = nb; 2498 if ((p = header_bytes(a, b)) == NULL) 2499 return (-1); 2500 memcpy(np, p, b); 2501 np += b; 2502 nb -= b; 2503 } 2504 np = zip->entry_names; 2505 nl = ll; 2506 2507 for (i = 0; i < zip->numFiles; i++) { 2508 entries[i].utf16name = np; 2509#if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG) 2510 entries[i].wname = (wchar_t *)np; 2511#endif 2512 2513 /* Find a terminator. */ 2514 while (nl >= 2 && (np[0] || np[1])) { 2515 np += 2; 2516 nl -= 2; 2517 } 2518 if (nl < 2) 2519 return (-1);/* Terminator not found */ 2520 entries[i].name_len = np - entries[i].utf16name; 2521 np += 2; 2522 nl -= 2; 2523 } 2524 break; 2525 } 2526 case kAttributes: 2527 { 2528 int allAreDefined; 2529 2530 if ((p = header_bytes(a, 2)) == NULL) 2531 return (-1); 2532 allAreDefined = *p; 2533 if (h->attrBools != NULL) 2534 return (-1); 2535 h->attrBools = calloc((size_t)zip->numFiles, 2536 sizeof(*h->attrBools)); 2537 if (h->attrBools == NULL) 2538 return (-1); 2539 if (allAreDefined) 2540 memset(h->attrBools, 1, (size_t)zip->numFiles); 2541 else { 2542 if (read_Bools(a, h->attrBools, 2543 (size_t)zip->numFiles) < 0) 2544 return (-1); 2545 } 2546 for (i = 0; i < zip->numFiles; i++) { 2547 if (h->attrBools[i]) { 2548 if ((p = header_bytes(a, 4)) == NULL) 2549 return (-1); 2550 entries[i].attr = archive_le32dec(p); 2551 } 2552 } 2553 break; 2554 } 2555 case kDummy: 2556 if (ll == 0) 2557 break; 2558 __LA_FALLTHROUGH; 2559 default: 2560 if (header_bytes(a, ll) == NULL) 2561 return (-1); 2562 break; 2563 } 2564 } 2565 2566 /* 2567 * Set up entry's attributes. 2568 */ 2569 folders = si->ci.folders; 2570 eindex = sindex = 0; 2571 folderIndex = indexInFolder = 0; 2572 for (i = 0; i < zip->numFiles; i++) { 2573 if (h->emptyStreamBools == NULL || h->emptyStreamBools[i] == 0) 2574 entries[i].flg |= HAS_STREAM; 2575 /* The high 16 bits of attributes is a posix file mode. */ 2576 entries[i].mode = entries[i].attr >> 16; 2577 if (entries[i].flg & HAS_STREAM) { 2578 if ((size_t)sindex >= si->ss.unpack_streams) 2579 return (-1); 2580 if (entries[i].mode == 0) 2581 entries[i].mode = AE_IFREG | 0666; 2582 if (si->ss.digestsDefined[sindex]) 2583 entries[i].flg |= CRC32_IS_SET; 2584 entries[i].ssIndex = sindex; 2585 sindex++; 2586 } else { 2587 int dir; 2588 if (h->emptyFileBools == NULL) 2589 dir = 1; 2590 else { 2591 if (h->emptyFileBools[eindex]) 2592 dir = 0; 2593 else 2594 dir = 1; 2595 eindex++; 2596 } 2597 if (entries[i].mode == 0) { 2598 if (dir) 2599 entries[i].mode = AE_IFDIR | 0777; 2600 else 2601 entries[i].mode = AE_IFREG | 0666; 2602 } else if (dir && 2603 (entries[i].mode & AE_IFMT) != AE_IFDIR) { 2604 entries[i].mode &= ~AE_IFMT; 2605 entries[i].mode |= AE_IFDIR; 2606 } 2607 if ((entries[i].mode & AE_IFMT) == AE_IFDIR && 2608 entries[i].name_len >= 2 && 2609 (entries[i].utf16name[entries[i].name_len-2] != '/' || 2610 entries[i].utf16name[entries[i].name_len-1] != 0)) { 2611 entries[i].utf16name[entries[i].name_len] = '/'; 2612 entries[i].utf16name[entries[i].name_len+1] = 0; 2613 entries[i].name_len += 2; 2614 } 2615 entries[i].ssIndex = -1; 2616 } 2617 if (entries[i].attr & 0x01) 2618 entries[i].mode &= ~0222;/* Read only. */ 2619 2620 if ((entries[i].flg & HAS_STREAM) == 0 && indexInFolder == 0) { 2621 /* 2622 * The entry is an empty file or a directory file, 2623 * those both have no contents. 2624 */ 2625 entries[i].folderIndex = -1; 2626 continue; 2627 } 2628 if (indexInFolder == 0) { 2629 for (;;) { 2630 if (folderIndex >= si->ci.numFolders) 2631 return (-1); 2632 if (folders[folderIndex].numUnpackStreams) 2633 break; 2634 folderIndex++; 2635 } 2636 } 2637 entries[i].folderIndex = folderIndex; 2638 if ((entries[i].flg & HAS_STREAM) == 0) 2639 continue; 2640 indexInFolder++; 2641 if (indexInFolder >= folders[folderIndex].numUnpackStreams) { 2642 folderIndex++; 2643 indexInFolder = 0; 2644 } 2645 } 2646 2647 return (0); 2648} 2649 2650#define EPOC_TIME ARCHIVE_LITERAL_ULL(116444736000000000) 2651static void 2652fileTimeToUtc(uint64_t fileTime, time_t *timep, long *ns) 2653{ 2654 2655 if (fileTime >= EPOC_TIME) { 2656 fileTime -= EPOC_TIME; 2657 /* milli seconds base */ 2658 *timep = (time_t)(fileTime / 10000000); 2659 /* nano seconds base */ 2660 *ns = (long)(fileTime % 10000000) * 100; 2661 } else { 2662 *timep = 0; 2663 *ns = 0; 2664 } 2665} 2666 2667static int 2668read_Times(struct archive_read *a, struct _7z_header_info *h, int type) 2669{ 2670 struct _7zip *zip = (struct _7zip *)a->format->data; 2671 const unsigned char *p; 2672 struct _7zip_entry *entries = zip->entries; 2673 unsigned char *timeBools; 2674 int allAreDefined; 2675 unsigned i; 2676 2677 timeBools = calloc((size_t)zip->numFiles, sizeof(*timeBools)); 2678 if (timeBools == NULL) 2679 return (-1); 2680 2681 /* Read allAreDefined. */ 2682 if ((p = header_bytes(a, 1)) == NULL) 2683 goto failed; 2684 allAreDefined = *p; 2685 if (allAreDefined) 2686 memset(timeBools, 1, (size_t)zip->numFiles); 2687 else { 2688 if (read_Bools(a, timeBools, (size_t)zip->numFiles) < 0) 2689 goto failed; 2690 } 2691 2692 /* Read external. */ 2693 if ((p = header_bytes(a, 1)) == NULL) 2694 goto failed; 2695 if (*p) { 2696 if (parse_7zip_uint64(a, &(h->dataIndex)) < 0) 2697 goto failed; 2698 if (UMAX_ENTRY < h->dataIndex) 2699 goto failed; 2700 } 2701 2702 for (i = 0; i < zip->numFiles; i++) { 2703 if (!timeBools[i]) 2704 continue; 2705 if ((p = header_bytes(a, 8)) == NULL) 2706 goto failed; 2707 switch (type) { 2708 case kCTime: 2709 fileTimeToUtc(archive_le64dec(p), 2710 &(entries[i].ctime), 2711 &(entries[i].ctime_ns)); 2712 entries[i].flg |= CTIME_IS_SET; 2713 break; 2714 case kATime: 2715 fileTimeToUtc(archive_le64dec(p), 2716 &(entries[i].atime), 2717 &(entries[i].atime_ns)); 2718 entries[i].flg |= ATIME_IS_SET; 2719 break; 2720 case kMTime: 2721 fileTimeToUtc(archive_le64dec(p), 2722 &(entries[i].mtime), 2723 &(entries[i].mtime_ns)); 2724 entries[i].flg |= MTIME_IS_SET; 2725 break; 2726 } 2727 } 2728 2729 free(timeBools); 2730 return (0); 2731failed: 2732 free(timeBools); 2733 return (-1); 2734} 2735 2736static int 2737decode_encoded_header_info(struct archive_read *a, struct _7z_stream_info *si) 2738{ 2739 struct _7zip *zip = (struct _7zip *)a->format->data; 2740 2741 errno = 0; 2742 if (read_StreamsInfo(a, si) < 0) { 2743 if (errno == ENOMEM) 2744 archive_set_error(&a->archive, -1, 2745 "Couldn't allocate memory"); 2746 else 2747 archive_set_error(&a->archive, -1, 2748 "Malformed 7-Zip archive"); 2749 return (ARCHIVE_FATAL); 2750 } 2751 2752 if (si->pi.numPackStreams == 0 || si->ci.numFolders == 0) { 2753 archive_set_error(&a->archive, -1, "Malformed 7-Zip archive"); 2754 return (ARCHIVE_FATAL); 2755 } 2756 2757 if (zip->header_offset < si->pi.pos + si->pi.sizes[0] || 2758 (int64_t)(si->pi.pos + si->pi.sizes[0]) < 0 || 2759 si->pi.sizes[0] == 0 || (int64_t)si->pi.pos < 0) { 2760 archive_set_error(&a->archive, -1, "Malformed Header offset"); 2761 return (ARCHIVE_FATAL); 2762 } 2763 2764 return (ARCHIVE_OK); 2765} 2766 2767static const unsigned char * 2768header_bytes(struct archive_read *a, size_t rbytes) 2769{ 2770 struct _7zip *zip = (struct _7zip *)a->format->data; 2771 const unsigned char *p; 2772 2773 if (zip->header_bytes_remaining < rbytes) 2774 return (NULL); 2775 if (zip->pack_stream_bytes_unconsumed) 2776 read_consume(a); 2777 2778 if (zip->header_is_encoded == 0) { 2779 p = __archive_read_ahead(a, rbytes, NULL); 2780 if (p == NULL) 2781 return (NULL); 2782 zip->header_bytes_remaining -= rbytes; 2783 zip->pack_stream_bytes_unconsumed = rbytes; 2784 } else { 2785 const void *buff; 2786 ssize_t bytes; 2787 2788 bytes = read_stream(a, &buff, rbytes, rbytes); 2789 if (bytes <= 0) 2790 return (NULL); 2791 zip->header_bytes_remaining -= bytes; 2792 p = buff; 2793 } 2794 2795 /* Update checksum */ 2796 zip->header_crc32 = crc32(zip->header_crc32, p, (unsigned)rbytes); 2797 return (p); 2798} 2799 2800static int 2801slurp_central_directory(struct archive_read *a, struct _7zip *zip, 2802 struct _7z_header_info *header) 2803{ 2804 const unsigned char *p; 2805 uint64_t next_header_offset; 2806 uint64_t next_header_size; 2807 uint32_t next_header_crc; 2808 ssize_t bytes_avail; 2809 int check_header_crc, r; 2810 2811 if ((p = __archive_read_ahead(a, 32, &bytes_avail)) == NULL) 2812 return (ARCHIVE_FATAL); 2813 2814 if ((p[0] == 'M' && p[1] == 'Z') || memcmp(p, "\x7F\x45LF", 4) == 0) { 2815 /* This is an executable ? Must be self-extracting... */ 2816 r = skip_sfx(a, bytes_avail); 2817 if (r < ARCHIVE_WARN) 2818 return (r); 2819 if ((p = __archive_read_ahead(a, 32, &bytes_avail)) == NULL) 2820 return (ARCHIVE_FATAL); 2821 } 2822 zip->seek_base += 32; 2823 2824 if (memcmp(p, _7ZIP_SIGNATURE, 6) != 0) { 2825 archive_set_error(&a->archive, -1, "Not 7-Zip archive file"); 2826 return (ARCHIVE_FATAL); 2827 } 2828 2829 /* CRC check. */ 2830 if (crc32(0, (const unsigned char *)p + 12, 20) 2831 != archive_le32dec(p + 8)) { 2832 archive_set_error(&a->archive, -1, "Header CRC error"); 2833 return (ARCHIVE_FATAL); 2834 } 2835 2836 next_header_offset = archive_le64dec(p + 12); 2837 next_header_size = archive_le64dec(p + 20); 2838 next_header_crc = archive_le32dec(p + 28); 2839 2840 if (next_header_size == 0) 2841 /* There is no entry in an archive file. */ 2842 return (ARCHIVE_EOF); 2843 2844 if (((int64_t)next_header_offset) < 0) { 2845 archive_set_error(&a->archive, -1, "Malformed 7-Zip archive"); 2846 return (ARCHIVE_FATAL); 2847 } 2848 __archive_read_consume(a, 32); 2849 if (next_header_offset != 0) { 2850 if (bytes_avail >= (ssize_t)next_header_offset) 2851 __archive_read_consume(a, next_header_offset); 2852 else if (__archive_read_seek(a, 2853 next_header_offset + zip->seek_base, SEEK_SET) < 0) 2854 return (ARCHIVE_FATAL); 2855 } 2856 zip->stream_offset = next_header_offset; 2857 zip->header_offset = next_header_offset; 2858 zip->header_bytes_remaining = next_header_size; 2859 zip->header_crc32 = 0; 2860 zip->header_is_encoded = 0; 2861 zip->header_is_being_read = 1; 2862 zip->has_encrypted_entries = 0; 2863 check_header_crc = 1; 2864 2865 if ((p = header_bytes(a, 1)) == NULL) { 2866 archive_set_error(&a->archive, 2867 ARCHIVE_ERRNO_FILE_FORMAT, 2868 "Truncated 7-Zip file body"); 2869 return (ARCHIVE_FATAL); 2870 } 2871 /* Parse ArchiveProperties. */ 2872 switch (p[0]) { 2873 case kEncodedHeader: 2874 /* 2875 * The archive has an encoded header and we have to decode it 2876 * in order to parse the header correctly. 2877 */ 2878 r = decode_encoded_header_info(a, &(zip->si)); 2879 2880 /* Check the EncodedHeader CRC.*/ 2881 if (r == 0 && zip->header_crc32 != next_header_crc) { 2882 archive_set_error(&a->archive, -1, 2883 "Damaged 7-Zip archive"); 2884 r = -1; 2885 } 2886 if (r == 0) { 2887 if (zip->si.ci.folders[0].digest_defined) 2888 next_header_crc = zip->si.ci.folders[0].digest; 2889 else 2890 check_header_crc = 0; 2891 if (zip->pack_stream_bytes_unconsumed) 2892 read_consume(a); 2893 r = setup_decode_folder(a, zip->si.ci.folders, 1); 2894 if (r == 0) { 2895 zip->header_bytes_remaining = 2896 zip->folder_outbytes_remaining; 2897 r = seek_pack(a); 2898 } 2899 } 2900 /* Clean up StreamsInfo. */ 2901 free_StreamsInfo(&(zip->si)); 2902 memset(&(zip->si), 0, sizeof(zip->si)); 2903 if (r < 0) 2904 return (ARCHIVE_FATAL); 2905 zip->header_is_encoded = 1; 2906 zip->header_crc32 = 0; 2907 /* FALL THROUGH */ 2908 case kHeader: 2909 /* 2910 * Parse the header. 2911 */ 2912 errno = 0; 2913 r = read_Header(a, header, zip->header_is_encoded); 2914 if (r < 0) { 2915 if (errno == ENOMEM) 2916 archive_set_error(&a->archive, -1, 2917 "Couldn't allocate memory"); 2918 else 2919 archive_set_error(&a->archive, -1, 2920 "Damaged 7-Zip archive"); 2921 return (ARCHIVE_FATAL); 2922 } 2923 2924 /* 2925 * Must be kEnd. 2926 */ 2927 if ((p = header_bytes(a, 1)) == NULL ||*p != kEnd) { 2928 archive_set_error(&a->archive, -1, 2929 "Malformed 7-Zip archive"); 2930 return (ARCHIVE_FATAL); 2931 } 2932 2933 /* Check the Header CRC.*/ 2934 if (check_header_crc && zip->header_crc32 != next_header_crc) { 2935 archive_set_error(&a->archive, -1, 2936 "Malformed 7-Zip archive"); 2937 return (ARCHIVE_FATAL); 2938 } 2939 break; 2940 default: 2941 archive_set_error(&a->archive, -1, 2942 "Unexpected Property ID = %X", p[0]); 2943 return (ARCHIVE_FATAL); 2944 } 2945 2946 /* Clean up variables be used for decoding the archive header */ 2947 zip->pack_stream_remaining = 0; 2948 zip->pack_stream_index = 0; 2949 zip->folder_outbytes_remaining = 0; 2950 zip->uncompressed_buffer_bytes_remaining = 0; 2951 zip->pack_stream_bytes_unconsumed = 0; 2952 zip->header_is_being_read = 0; 2953 2954 return (ARCHIVE_OK); 2955} 2956 2957static ssize_t 2958get_uncompressed_data(struct archive_read *a, const void **buff, size_t size, 2959 size_t minimum) 2960{ 2961 struct _7zip *zip = (struct _7zip *)a->format->data; 2962 ssize_t bytes_avail; 2963 2964 if (zip->codec == _7Z_COPY && zip->codec2 == (unsigned long)-1) { 2965 /* Copy mode. */ 2966 2967 *buff = __archive_read_ahead(a, minimum, &bytes_avail); 2968 if (bytes_avail <= 0) { 2969 archive_set_error(&a->archive, 2970 ARCHIVE_ERRNO_FILE_FORMAT, 2971 "Truncated 7-Zip file data"); 2972 return (ARCHIVE_FATAL); 2973 } 2974 if ((size_t)bytes_avail > 2975 zip->uncompressed_buffer_bytes_remaining) 2976 bytes_avail = (ssize_t) 2977 zip->uncompressed_buffer_bytes_remaining; 2978 if ((size_t)bytes_avail > size) 2979 bytes_avail = (ssize_t)size; 2980 2981 zip->pack_stream_bytes_unconsumed = bytes_avail; 2982 } else if (zip->uncompressed_buffer_pointer == NULL) { 2983 /* Decompression has failed. */ 2984 archive_set_error(&(a->archive), 2985 ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive"); 2986 return (ARCHIVE_FATAL); 2987 } else { 2988 /* Packed mode. */ 2989 if (minimum > zip->uncompressed_buffer_bytes_remaining) { 2990 /* 2991 * If remaining uncompressed data size is less than 2992 * the minimum size, fill the buffer up to the 2993 * minimum size. 2994 */ 2995 if (extract_pack_stream(a, minimum) < 0) 2996 return (ARCHIVE_FATAL); 2997 } 2998 if (size > zip->uncompressed_buffer_bytes_remaining) 2999 bytes_avail = (ssize_t) 3000 zip->uncompressed_buffer_bytes_remaining; 3001 else 3002 bytes_avail = (ssize_t)size; 3003 *buff = zip->uncompressed_buffer_pointer; 3004 zip->uncompressed_buffer_pointer += bytes_avail; 3005 } 3006 zip->uncompressed_buffer_bytes_remaining -= bytes_avail; 3007 return (bytes_avail); 3008} 3009 3010static ssize_t 3011extract_pack_stream(struct archive_read *a, size_t minimum) 3012{ 3013 struct _7zip *zip = (struct _7zip *)a->format->data; 3014 ssize_t bytes_avail; 3015 int r; 3016 3017 if (zip->codec == _7Z_COPY && zip->codec2 == (unsigned long)-1) { 3018 if (minimum == 0) 3019 minimum = 1; 3020 if (__archive_read_ahead(a, minimum, &bytes_avail) == NULL 3021 || bytes_avail <= 0) { 3022 archive_set_error(&a->archive, 3023 ARCHIVE_ERRNO_FILE_FORMAT, 3024 "Truncated 7-Zip file body"); 3025 return (ARCHIVE_FATAL); 3026 } 3027 if (bytes_avail > (ssize_t)zip->pack_stream_inbytes_remaining) 3028 bytes_avail = (ssize_t)zip->pack_stream_inbytes_remaining; 3029 zip->pack_stream_inbytes_remaining -= bytes_avail; 3030 if (bytes_avail > (ssize_t)zip->folder_outbytes_remaining) 3031 bytes_avail = (ssize_t)zip->folder_outbytes_remaining; 3032 zip->folder_outbytes_remaining -= bytes_avail; 3033 zip->uncompressed_buffer_bytes_remaining = bytes_avail; 3034 return (ARCHIVE_OK); 3035 } 3036 3037 /* If the buffer hasn't been allocated, allocate it now. */ 3038 if (zip->uncompressed_buffer == NULL) { 3039 zip->uncompressed_buffer_size = UBUFF_SIZE; 3040 if (zip->uncompressed_buffer_size < minimum) { 3041 zip->uncompressed_buffer_size = minimum + 1023; 3042 zip->uncompressed_buffer_size &= ~0x3ff; 3043 } 3044 zip->uncompressed_buffer = 3045 malloc(zip->uncompressed_buffer_size); 3046 if (zip->uncompressed_buffer == NULL) { 3047 archive_set_error(&a->archive, ENOMEM, 3048 "No memory for 7-Zip decompression"); 3049 return (ARCHIVE_FATAL); 3050 } 3051 zip->uncompressed_buffer_bytes_remaining = 0; 3052 } else if (zip->uncompressed_buffer_size < minimum || 3053 zip->uncompressed_buffer_bytes_remaining < minimum) { 3054 /* 3055 * Make sure the uncompressed buffer can have bytes 3056 * at least `minimum' bytes. 3057 * NOTE: This case happen when reading the header. 3058 */ 3059 size_t used; 3060 if (zip->uncompressed_buffer_pointer != 0) 3061 used = zip->uncompressed_buffer_pointer - 3062 zip->uncompressed_buffer; 3063 else 3064 used = 0; 3065 if (zip->uncompressed_buffer_size < minimum) { 3066 /* 3067 * Expand the uncompressed buffer up to 3068 * the minimum size. 3069 */ 3070 void *p; 3071 size_t new_size; 3072 3073 new_size = minimum + 1023; 3074 new_size &= ~0x3ff; 3075 p = realloc(zip->uncompressed_buffer, new_size); 3076 if (p == NULL) { 3077 archive_set_error(&a->archive, ENOMEM, 3078 "No memory for 7-Zip decompression"); 3079 return (ARCHIVE_FATAL); 3080 } 3081 zip->uncompressed_buffer = (unsigned char *)p; 3082 zip->uncompressed_buffer_size = new_size; 3083 } 3084 /* 3085 * Move unconsumed bytes to the head. 3086 */ 3087 if (used) { 3088 memmove(zip->uncompressed_buffer, 3089 zip->uncompressed_buffer + used, 3090 zip->uncompressed_buffer_bytes_remaining); 3091 } 3092 } else 3093 zip->uncompressed_buffer_bytes_remaining = 0; 3094 zip->uncompressed_buffer_pointer = NULL; 3095 for (;;) { 3096 size_t bytes_in, bytes_out; 3097 const void *buff_in; 3098 unsigned char *buff_out; 3099 int end_of_data; 3100 3101 /* 3102 * Note: '1' here is a performance optimization. 3103 * Recall that the decompression layer returns a count of 3104 * available bytes; asking for more than that forces the 3105 * decompressor to combine reads by copying data. 3106 */ 3107 buff_in = __archive_read_ahead(a, 1, &bytes_avail); 3108 if (bytes_avail <= 0) { 3109 archive_set_error(&a->archive, 3110 ARCHIVE_ERRNO_FILE_FORMAT, 3111 "Truncated 7-Zip file body"); 3112 return (ARCHIVE_FATAL); 3113 } 3114 3115 buff_out = zip->uncompressed_buffer 3116 + zip->uncompressed_buffer_bytes_remaining; 3117 bytes_out = zip->uncompressed_buffer_size 3118 - zip->uncompressed_buffer_bytes_remaining; 3119 bytes_in = bytes_avail; 3120 if (bytes_in > zip->pack_stream_inbytes_remaining) 3121 bytes_in = (size_t)zip->pack_stream_inbytes_remaining; 3122 /* Drive decompression. */ 3123 r = decompress(a, zip, buff_out, &bytes_out, 3124 buff_in, &bytes_in); 3125 switch (r) { 3126 case ARCHIVE_OK: 3127 end_of_data = 0; 3128 break; 3129 case ARCHIVE_EOF: 3130 end_of_data = 1; 3131 break; 3132 default: 3133 return (ARCHIVE_FATAL); 3134 } 3135 zip->pack_stream_inbytes_remaining -= bytes_in; 3136 if (bytes_out > zip->folder_outbytes_remaining) 3137 bytes_out = (size_t)zip->folder_outbytes_remaining; 3138 zip->folder_outbytes_remaining -= bytes_out; 3139 zip->uncompressed_buffer_bytes_remaining += bytes_out; 3140 zip->pack_stream_bytes_unconsumed = bytes_in; 3141 3142 /* 3143 * Continue decompression until uncompressed_buffer is full. 3144 */ 3145 if (zip->uncompressed_buffer_bytes_remaining == 3146 zip->uncompressed_buffer_size) 3147 break; 3148 if (zip->codec2 == _7Z_X86 && zip->odd_bcj_size && 3149 zip->uncompressed_buffer_bytes_remaining + 5 > 3150 zip->uncompressed_buffer_size) 3151 break; 3152 if (zip->pack_stream_inbytes_remaining == 0 && 3153 zip->folder_outbytes_remaining == 0) 3154 break; 3155 if (end_of_data || (bytes_in == 0 && bytes_out == 0)) { 3156 archive_set_error(&(a->archive), 3157 ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive"); 3158 return (ARCHIVE_FATAL); 3159 } 3160 read_consume(a); 3161 } 3162 if (zip->uncompressed_buffer_bytes_remaining < minimum) { 3163 archive_set_error(&(a->archive), 3164 ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive"); 3165 return (ARCHIVE_FATAL); 3166 } 3167 zip->uncompressed_buffer_pointer = zip->uncompressed_buffer; 3168 return (ARCHIVE_OK); 3169} 3170 3171static int 3172seek_pack(struct archive_read *a) 3173{ 3174 struct _7zip *zip = (struct _7zip *)a->format->data; 3175 int64_t pack_offset; 3176 3177 if (zip->pack_stream_remaining <= 0) { 3178 archive_set_error(&(a->archive), 3179 ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive"); 3180 return (ARCHIVE_FATAL); 3181 } 3182 zip->pack_stream_inbytes_remaining = 3183 zip->si.pi.sizes[zip->pack_stream_index]; 3184 pack_offset = zip->si.pi.positions[zip->pack_stream_index]; 3185 if (zip->stream_offset != pack_offset) { 3186 if (0 > __archive_read_seek(a, pack_offset + zip->seek_base, 3187 SEEK_SET)) 3188 return (ARCHIVE_FATAL); 3189 zip->stream_offset = pack_offset; 3190 } 3191 zip->pack_stream_index++; 3192 zip->pack_stream_remaining--; 3193 return (ARCHIVE_OK); 3194} 3195 3196static ssize_t 3197read_stream(struct archive_read *a, const void **buff, size_t size, 3198 size_t minimum) 3199{ 3200 struct _7zip *zip = (struct _7zip *)a->format->data; 3201 uint64_t skip_bytes = 0; 3202 ssize_t r; 3203 3204 if (zip->uncompressed_buffer_bytes_remaining == 0) { 3205 if (zip->pack_stream_inbytes_remaining > 0) { 3206 r = extract_pack_stream(a, 0); 3207 if (r < 0) 3208 return (r); 3209 return (get_uncompressed_data(a, buff, size, minimum)); 3210 } else if (zip->folder_outbytes_remaining > 0) { 3211 /* Extract a remaining pack stream. */ 3212 r = extract_pack_stream(a, 0); 3213 if (r < 0) 3214 return (r); 3215 return (get_uncompressed_data(a, buff, size, minimum)); 3216 } 3217 } else 3218 return (get_uncompressed_data(a, buff, size, minimum)); 3219 3220 /* 3221 * Current pack stream has been consumed. 3222 */ 3223 if (zip->pack_stream_remaining == 0) { 3224 if (zip->header_is_being_read) { 3225 /* Invalid sequence. This might happen when 3226 * reading a malformed archive. */ 3227 archive_set_error(&(a->archive), 3228 ARCHIVE_ERRNO_MISC, "Malformed 7-Zip archive"); 3229 return (ARCHIVE_FATAL); 3230 } 3231 3232 /* 3233 * All current folder's pack streams have been 3234 * consumed. Switch to next folder. 3235 */ 3236 if (zip->folder_index == 0 && 3237 (zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes 3238 || zip->folder_index != zip->entry->folderIndex)) { 3239 zip->folder_index = zip->entry->folderIndex; 3240 skip_bytes = 3241 zip->si.ci.folders[zip->folder_index].skipped_bytes; 3242 } 3243 3244 if (zip->folder_index >= zip->si.ci.numFolders) { 3245 /* 3246 * We have consumed all folders and its pack streams. 3247 */ 3248 *buff = NULL; 3249 return (0); 3250 } 3251 r = setup_decode_folder(a, 3252 &(zip->si.ci.folders[zip->folder_index]), 0); 3253 if (r != ARCHIVE_OK) 3254 return (ARCHIVE_FATAL); 3255 3256 zip->folder_index++; 3257 } 3258 3259 /* 3260 * Switch to next pack stream. 3261 */ 3262 r = seek_pack(a); 3263 if (r < 0) 3264 return (r); 3265 3266 /* Extract a new pack stream. */ 3267 r = extract_pack_stream(a, 0); 3268 if (r < 0) 3269 return (r); 3270 3271 /* 3272 * Skip the bytes we already has skipped in skip_stream(). 3273 */ 3274 while (skip_bytes) { 3275 ssize_t skipped; 3276 3277 if (zip->uncompressed_buffer_bytes_remaining == 0) { 3278 if (zip->pack_stream_inbytes_remaining > 0) { 3279 r = extract_pack_stream(a, 0); 3280 if (r < 0) 3281 return (r); 3282 } else if (zip->folder_outbytes_remaining > 0) { 3283 /* Extract a remaining pack stream. */ 3284 r = extract_pack_stream(a, 0); 3285 if (r < 0) 3286 return (r); 3287 } else { 3288 archive_set_error(&a->archive, 3289 ARCHIVE_ERRNO_FILE_FORMAT, 3290 "Truncated 7-Zip file body"); 3291 return (ARCHIVE_FATAL); 3292 } 3293 } 3294 skipped = get_uncompressed_data( 3295 a, buff, (size_t)skip_bytes, 0); 3296 if (skipped < 0) 3297 return (skipped); 3298 skip_bytes -= skipped; 3299 if (zip->pack_stream_bytes_unconsumed) 3300 read_consume(a); 3301 } 3302 3303 return (get_uncompressed_data(a, buff, size, minimum)); 3304} 3305 3306static int 3307setup_decode_folder(struct archive_read *a, struct _7z_folder *folder, 3308 int header) 3309{ 3310 struct _7zip *zip = (struct _7zip *)a->format->data; 3311 const struct _7z_coder *coder1, *coder2; 3312 const char *cname = (header)?"archive header":"file content"; 3313 unsigned i; 3314 int r, found_bcj2 = 0; 3315 3316 /* 3317 * Release the memory which the previous folder used for BCJ2. 3318 */ 3319 for (i = 0; i < 3; i++) { 3320 free(zip->sub_stream_buff[i]); 3321 zip->sub_stream_buff[i] = NULL; 3322 } 3323 3324 /* 3325 * Initialize a stream reader. 3326 */ 3327 zip->pack_stream_remaining = (unsigned)folder->numPackedStreams; 3328 zip->pack_stream_index = (unsigned)folder->packIndex; 3329 zip->folder_outbytes_remaining = folder_uncompressed_size(folder); 3330 zip->uncompressed_buffer_bytes_remaining = 0; 3331 3332 /* 3333 * Check coder types. 3334 */ 3335 for (i = 0; i < folder->numCoders; i++) { 3336 switch(folder->coders[i].codec) { 3337 case _7Z_CRYPTO_MAIN_ZIP: 3338 case _7Z_CRYPTO_RAR_29: 3339 case _7Z_CRYPTO_AES_256_SHA_256: { 3340 /* For entry that is associated with this folder, mark 3341 it as encrypted (data+metadata). */ 3342 zip->has_encrypted_entries = 1; 3343 if (a->entry) { 3344 archive_entry_set_is_data_encrypted(a->entry, 1); 3345 archive_entry_set_is_metadata_encrypted(a->entry, 1); 3346 } 3347 archive_set_error(&(a->archive), 3348 ARCHIVE_ERRNO_MISC, 3349 "The %s is encrypted, " 3350 "but currently not supported", cname); 3351 return (ARCHIVE_FATAL); 3352 } 3353 case _7Z_X86_BCJ2: { 3354 found_bcj2++; 3355 break; 3356 } 3357 } 3358 } 3359 /* Now that we've checked for encryption, if there were still no 3360 * encrypted entries found we can say for sure that there are none. 3361 */ 3362 if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { 3363 zip->has_encrypted_entries = 0; 3364 } 3365 3366 if ((folder->numCoders > 2 && !found_bcj2) || found_bcj2 > 1) { 3367 archive_set_error(&(a->archive), 3368 ARCHIVE_ERRNO_MISC, 3369 "The %s is encoded with many filters, " 3370 "but currently not supported", cname); 3371 return (ARCHIVE_FATAL); 3372 } 3373 coder1 = &(folder->coders[0]); 3374 if (folder->numCoders == 2) 3375 coder2 = &(folder->coders[1]); 3376 else 3377 coder2 = NULL; 3378 3379 if (found_bcj2) { 3380 /* 3381 * Preparation to decode BCJ2. 3382 * Decoding BCJ2 requires four sources. Those are at least, 3383 * as far as I know, two types of the storage form. 3384 */ 3385 const struct _7z_coder *fc = folder->coders; 3386 static const struct _7z_coder coder_copy = {0, 1, 1, 0, NULL}; 3387 const struct _7z_coder *scoder[3] = 3388 {&coder_copy, &coder_copy, &coder_copy}; 3389 const void *buff; 3390 ssize_t bytes; 3391 unsigned char *b[3] = {NULL, NULL, NULL}; 3392 uint64_t sunpack[3] ={-1, -1, -1}; 3393 size_t s[3] = {0, 0, 0}; 3394 int idx[3] = {0, 1, 2}; 3395 3396 if (folder->numCoders == 4 && fc[3].codec == _7Z_X86_BCJ2 && 3397 folder->numInStreams == 7 && folder->numOutStreams == 4 && 3398 zip->pack_stream_remaining == 4) { 3399 /* Source type 1 made by 7zr or 7z with -m options. */ 3400 if (folder->bindPairs[0].inIndex == 5) { 3401 /* The form made by 7zr */ 3402 idx[0] = 1; idx[1] = 2; idx[2] = 0; 3403 scoder[1] = &(fc[1]); 3404 scoder[2] = &(fc[0]); 3405 sunpack[1] = folder->unPackSize[1]; 3406 sunpack[2] = folder->unPackSize[0]; 3407 coder1 = &(fc[2]); 3408 } else { 3409 /* 3410 * NOTE: Some patterns do not work. 3411 * work: 3412 * 7z a -m0=BCJ2 -m1=COPY -m2=COPY 3413 * -m3=(any) 3414 * 7z a -m0=BCJ2 -m1=COPY -m2=(any) 3415 * -m3=COPY 3416 * 7z a -m0=BCJ2 -m1=(any) -m2=COPY 3417 * -m3=COPY 3418 * not work: 3419 * other patterns. 3420 * 3421 * We have to handle this like `pipe' or 3422 * our libarchive7s filter frame work, 3423 * decoding the BCJ2 main stream sequentially, 3424 * m3 -> m2 -> m1 -> BCJ2. 3425 * 3426 */ 3427 if (fc[0].codec == _7Z_COPY && 3428 fc[1].codec == _7Z_COPY) 3429 coder1 = &(folder->coders[2]); 3430 else if (fc[0].codec == _7Z_COPY && 3431 fc[2].codec == _7Z_COPY) 3432 coder1 = &(folder->coders[1]); 3433 else if (fc[1].codec == _7Z_COPY && 3434 fc[2].codec == _7Z_COPY) 3435 coder1 = &(folder->coders[0]); 3436 else { 3437 archive_set_error(&(a->archive), 3438 ARCHIVE_ERRNO_MISC, 3439 "Unsupported form of " 3440 "BCJ2 streams"); 3441 return (ARCHIVE_FATAL); 3442 } 3443 } 3444 coder2 = &(fc[3]); 3445 zip->main_stream_bytes_remaining = 3446 (size_t)folder->unPackSize[2]; 3447 } else if (coder2 != NULL && coder2->codec == _7Z_X86_BCJ2 && 3448 zip->pack_stream_remaining == 4 && 3449 folder->numInStreams == 5 && folder->numOutStreams == 2) { 3450 /* Source type 0 made by 7z */ 3451 zip->main_stream_bytes_remaining = 3452 (size_t)folder->unPackSize[0]; 3453 } else { 3454 /* We got an unexpected form. */ 3455 archive_set_error(&(a->archive), 3456 ARCHIVE_ERRNO_MISC, 3457 "Unsupported form of BCJ2 streams"); 3458 return (ARCHIVE_FATAL); 3459 } 3460 3461 /* Skip the main stream at this time. */ 3462 if ((r = seek_pack(a)) < 0) 3463 return (r); 3464 zip->pack_stream_bytes_unconsumed = 3465 (size_t)zip->pack_stream_inbytes_remaining; 3466 read_consume(a); 3467 3468 /* Read following three sub streams. */ 3469 for (i = 0; i < 3; i++) { 3470 const struct _7z_coder *coder = scoder[i]; 3471 3472 if ((r = seek_pack(a)) < 0) { 3473 free(b[0]); free(b[1]); free(b[2]); 3474 return (r); 3475 } 3476 3477 if (sunpack[i] == (uint64_t)-1) 3478 zip->folder_outbytes_remaining = 3479 zip->pack_stream_inbytes_remaining; 3480 else 3481 zip->folder_outbytes_remaining = sunpack[i]; 3482 3483 r = init_decompression(a, zip, coder, NULL); 3484 if (r != ARCHIVE_OK) { 3485 free(b[0]); free(b[1]); free(b[2]); 3486 return (ARCHIVE_FATAL); 3487 } 3488 3489 /* Allocate memory for the decoded data of a sub 3490 * stream. */ 3491 b[i] = malloc((size_t)zip->folder_outbytes_remaining); 3492 if (b[i] == NULL) { 3493 free(b[0]); free(b[1]); free(b[2]); 3494 archive_set_error(&a->archive, ENOMEM, 3495 "No memory for 7-Zip decompression"); 3496 return (ARCHIVE_FATAL); 3497 } 3498 3499 /* Extract a sub stream. */ 3500 while (zip->pack_stream_inbytes_remaining > 0) { 3501 r = (int)extract_pack_stream(a, 0); 3502 if (r < 0) { 3503 free(b[0]); free(b[1]); free(b[2]); 3504 return (r); 3505 } 3506 bytes = get_uncompressed_data(a, &buff, 3507 zip->uncompressed_buffer_bytes_remaining, 3508 0); 3509 if (bytes < 0) { 3510 free(b[0]); free(b[1]); free(b[2]); 3511 return ((int)bytes); 3512 } 3513 memcpy(b[i]+s[i], buff, bytes); 3514 s[i] += bytes; 3515 if (zip->pack_stream_bytes_unconsumed) 3516 read_consume(a); 3517 } 3518 } 3519 3520 /* Set the sub streams to the right place. */ 3521 for (i = 0; i < 3; i++) { 3522 zip->sub_stream_buff[i] = b[idx[i]]; 3523 zip->sub_stream_size[i] = s[idx[i]]; 3524 zip->sub_stream_bytes_remaining[i] = s[idx[i]]; 3525 } 3526 3527 /* Allocate memory used for decoded main stream bytes. */ 3528 if (zip->tmp_stream_buff == NULL) { 3529 zip->tmp_stream_buff_size = 32 * 1024; 3530 zip->tmp_stream_buff = 3531 malloc(zip->tmp_stream_buff_size); 3532 if (zip->tmp_stream_buff == NULL) { 3533 archive_set_error(&a->archive, ENOMEM, 3534 "No memory for 7-Zip decompression"); 3535 return (ARCHIVE_FATAL); 3536 } 3537 } 3538 zip->tmp_stream_bytes_avail = 0; 3539 zip->tmp_stream_bytes_remaining = 0; 3540 zip->odd_bcj_size = 0; 3541 zip->bcj2_outPos = 0; 3542 3543 /* 3544 * Reset a stream reader in order to read the main stream 3545 * of BCJ2. 3546 */ 3547 zip->pack_stream_remaining = 1; 3548 zip->pack_stream_index = (unsigned)folder->packIndex; 3549 zip->folder_outbytes_remaining = 3550 folder_uncompressed_size(folder); 3551 zip->uncompressed_buffer_bytes_remaining = 0; 3552 } 3553 3554 /* 3555 * Initialize the decompressor for the new folder's pack streams. 3556 */ 3557 r = init_decompression(a, zip, coder1, coder2); 3558 if (r != ARCHIVE_OK) 3559 return (ARCHIVE_FATAL); 3560 return (ARCHIVE_OK); 3561} 3562 3563static int64_t 3564skip_stream(struct archive_read *a, size_t skip_bytes) 3565{ 3566 struct _7zip *zip = (struct _7zip *)a->format->data; 3567 const void *p; 3568 int64_t skipped_bytes; 3569 size_t bytes = skip_bytes; 3570 3571 if (zip->folder_index == 0) { 3572 /* 3573 * Optimization for a list mode. 3574 * Avoid unnecessary decoding operations. 3575 */ 3576 zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes 3577 += skip_bytes; 3578 return (skip_bytes); 3579 } 3580 3581 while (bytes) { 3582 skipped_bytes = read_stream(a, &p, bytes, 0); 3583 if (skipped_bytes < 0) 3584 return (skipped_bytes); 3585 if (skipped_bytes == 0) { 3586 archive_set_error(&a->archive, 3587 ARCHIVE_ERRNO_FILE_FORMAT, 3588 "Truncated 7-Zip file body"); 3589 return (ARCHIVE_FATAL); 3590 } 3591 bytes -= (size_t)skipped_bytes; 3592 if (zip->pack_stream_bytes_unconsumed) 3593 read_consume(a); 3594 } 3595 return (skip_bytes); 3596} 3597 3598/* 3599 * Brought from LZMA SDK. 3600 * 3601 * Bra86.c -- Converter for x86 code (BCJ) 3602 * 2008-10-04 : Igor Pavlov : Public domain 3603 * 3604 */ 3605 3606#define Test86MSByte(b) ((b) == 0 || (b) == 0xFF) 3607 3608static void 3609x86_Init(struct _7zip *zip) 3610{ 3611 zip->bcj_state = 0; 3612 zip->bcj_prevPosT = (size_t)0 - 1; 3613 zip->bcj_prevMask = 0; 3614 zip->bcj_ip = 5; 3615} 3616 3617static size_t 3618x86_Convert(struct _7zip *zip, uint8_t *data, size_t size) 3619{ 3620 static const uint8_t kMaskToAllowedStatus[8] = {1, 1, 1, 0, 1, 0, 0, 0}; 3621 static const uint8_t kMaskToBitNumber[8] = {0, 1, 2, 2, 3, 3, 3, 3}; 3622 size_t bufferPos, prevPosT; 3623 uint32_t ip, prevMask; 3624 3625 if (size < 5) 3626 return 0; 3627 3628 bufferPos = 0; 3629 prevPosT = zip->bcj_prevPosT; 3630 prevMask = zip->bcj_prevMask; 3631 ip = zip->bcj_ip; 3632 3633 for (;;) { 3634 uint8_t *p = data + bufferPos; 3635 uint8_t *limit = data + size - 4; 3636 3637 for (; p < limit; p++) 3638 if ((*p & 0xFE) == 0xE8) 3639 break; 3640 bufferPos = (size_t)(p - data); 3641 if (p >= limit) 3642 break; 3643 prevPosT = bufferPos - prevPosT; 3644 if (prevPosT > 3) 3645 prevMask = 0; 3646 else { 3647 prevMask = (prevMask << ((int)prevPosT - 1)) & 0x7; 3648 if (prevMask != 0) { 3649 unsigned char b = 3650 p[4 - kMaskToBitNumber[prevMask]]; 3651 if (!kMaskToAllowedStatus[prevMask] || 3652 Test86MSByte(b)) { 3653 prevPosT = bufferPos; 3654 prevMask = ((prevMask << 1) & 0x7) | 1; 3655 bufferPos++; 3656 continue; 3657 } 3658 } 3659 } 3660 prevPosT = bufferPos; 3661 3662 if (Test86MSByte(p[4])) { 3663 uint32_t src = ((uint32_t)p[4] << 24) | 3664 ((uint32_t)p[3] << 16) | ((uint32_t)p[2] << 8) | 3665 ((uint32_t)p[1]); 3666 uint32_t dest; 3667 for (;;) { 3668 uint8_t b; 3669 int b_index; 3670 3671 dest = src - (ip + (uint32_t)bufferPos); 3672 if (prevMask == 0) 3673 break; 3674 b_index = kMaskToBitNumber[prevMask] * 8; 3675 b = (uint8_t)(dest >> (24 - b_index)); 3676 if (!Test86MSByte(b)) 3677 break; 3678 src = dest ^ ((1 << (32 - b_index)) - 1); 3679 } 3680 p[4] = (uint8_t)(~(((dest >> 24) & 1) - 1)); 3681 p[3] = (uint8_t)(dest >> 16); 3682 p[2] = (uint8_t)(dest >> 8); 3683 p[1] = (uint8_t)dest; 3684 bufferPos += 5; 3685 } else { 3686 prevMask = ((prevMask << 1) & 0x7) | 1; 3687 bufferPos++; 3688 } 3689 } 3690 zip->bcj_prevPosT = prevPosT; 3691 zip->bcj_prevMask = prevMask; 3692 zip->bcj_ip += (uint32_t)bufferPos; 3693 return (bufferPos); 3694} 3695 3696/* 3697 * Brought from LZMA SDK. 3698 * 3699 * Bcj2.c -- Converter for x86 code (BCJ2) 3700 * 2008-10-04 : Igor Pavlov : Public domain 3701 * 3702 */ 3703 3704#define SZ_ERROR_DATA ARCHIVE_FAILED 3705 3706#define IsJcc(b0, b1) ((b0) == 0x0F && ((b1) & 0xF0) == 0x80) 3707#define IsJ(b0, b1) ((b1 & 0xFE) == 0xE8 || IsJcc(b0, b1)) 3708 3709#define kNumTopBits 24 3710#define kTopValue ((uint32_t)1 << kNumTopBits) 3711 3712#define kNumBitModelTotalBits 11 3713#define kBitModelTotal (1 << kNumBitModelTotalBits) 3714#define kNumMoveBits 5 3715 3716#define RC_READ_BYTE (*buffer++) 3717#define RC_TEST { if (buffer == bufferLim) return SZ_ERROR_DATA; } 3718#define RC_INIT2 zip->bcj2_code = 0; zip->bcj2_range = 0xFFFFFFFF; \ 3719 { int ii; for (ii = 0; ii < 5; ii++) { RC_TEST; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; }} 3720 3721#define NORMALIZE if (zip->bcj2_range < kTopValue) { RC_TEST; zip->bcj2_range <<= 8; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; } 3722 3723#define IF_BIT_0(p) ttt = *(p); bound = (zip->bcj2_range >> kNumBitModelTotalBits) * ttt; if (zip->bcj2_code < bound) 3724#define UPDATE_0(p) zip->bcj2_range = bound; *(p) = (CProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits)); NORMALIZE; 3725#define UPDATE_1(p) zip->bcj2_range -= bound; zip->bcj2_code -= bound; *(p) = (CProb)(ttt - (ttt >> kNumMoveBits)); NORMALIZE; 3726 3727static ssize_t 3728Bcj2_Decode(struct _7zip *zip, uint8_t *outBuf, size_t outSize) 3729{ 3730 size_t inPos = 0, outPos = 0; 3731 const uint8_t *buf0, *buf1, *buf2, *buf3; 3732 size_t size0, size1, size2, size3; 3733 const uint8_t *buffer, *bufferLim; 3734 unsigned int i, j; 3735 3736 size0 = zip->tmp_stream_bytes_remaining; 3737 buf0 = zip->tmp_stream_buff + zip->tmp_stream_bytes_avail - size0; 3738 size1 = zip->sub_stream_bytes_remaining[0]; 3739 buf1 = zip->sub_stream_buff[0] + zip->sub_stream_size[0] - size1; 3740 size2 = zip->sub_stream_bytes_remaining[1]; 3741 buf2 = zip->sub_stream_buff[1] + zip->sub_stream_size[1] - size2; 3742 size3 = zip->sub_stream_bytes_remaining[2]; 3743 buf3 = zip->sub_stream_buff[2] + zip->sub_stream_size[2] - size3; 3744 3745 buffer = buf3; 3746 bufferLim = buffer + size3; 3747 3748 if (zip->bcj_state == 0) { 3749 /* 3750 * Initialize. 3751 */ 3752 zip->bcj2_prevByte = 0; 3753 for (i = 0; 3754 i < sizeof(zip->bcj2_p) / sizeof(zip->bcj2_p[0]); i++) 3755 zip->bcj2_p[i] = kBitModelTotal >> 1; 3756 RC_INIT2; 3757 zip->bcj_state = 1; 3758 } 3759 3760 /* 3761 * Gather the odd bytes of a previous call. 3762 */ 3763 for (i = 0; zip->odd_bcj_size > 0 && outPos < outSize; i++) { 3764 outBuf[outPos++] = zip->odd_bcj[i]; 3765 zip->odd_bcj_size--; 3766 } 3767 3768 if (outSize == 0) { 3769 zip->bcj2_outPos += outPos; 3770 return (outPos); 3771 } 3772 3773 for (;;) { 3774 uint8_t b; 3775 CProb *prob; 3776 uint32_t bound; 3777 uint32_t ttt; 3778 3779 size_t limit = size0 - inPos; 3780 if (outSize - outPos < limit) 3781 limit = outSize - outPos; 3782 3783 if (zip->bcj_state == 1) { 3784 while (limit != 0) { 3785 uint8_t bb = buf0[inPos]; 3786 outBuf[outPos++] = bb; 3787 if (IsJ(zip->bcj2_prevByte, bb)) { 3788 zip->bcj_state = 2; 3789 break; 3790 } 3791 inPos++; 3792 zip->bcj2_prevByte = bb; 3793 limit--; 3794 } 3795 } 3796 3797 if (limit == 0 || outPos == outSize) 3798 break; 3799 zip->bcj_state = 1; 3800 3801 b = buf0[inPos++]; 3802 3803 if (b == 0xE8) 3804 prob = zip->bcj2_p + zip->bcj2_prevByte; 3805 else if (b == 0xE9) 3806 prob = zip->bcj2_p + 256; 3807 else 3808 prob = zip->bcj2_p + 257; 3809 3810 IF_BIT_0(prob) { 3811 UPDATE_0(prob) 3812 zip->bcj2_prevByte = b; 3813 } else { 3814 uint32_t dest; 3815 const uint8_t *v; 3816 uint8_t out[4]; 3817 3818 UPDATE_1(prob) 3819 if (b == 0xE8) { 3820 v = buf1; 3821 if (size1 < 4) 3822 return SZ_ERROR_DATA; 3823 buf1 += 4; 3824 size1 -= 4; 3825 } else { 3826 v = buf2; 3827 if (size2 < 4) 3828 return SZ_ERROR_DATA; 3829 buf2 += 4; 3830 size2 -= 4; 3831 } 3832 dest = (((uint32_t)v[0] << 24) | 3833 ((uint32_t)v[1] << 16) | 3834 ((uint32_t)v[2] << 8) | 3835 ((uint32_t)v[3])) - 3836 ((uint32_t)zip->bcj2_outPos + (uint32_t)outPos + 4); 3837 out[0] = (uint8_t)dest; 3838 out[1] = (uint8_t)(dest >> 8); 3839 out[2] = (uint8_t)(dest >> 16); 3840 out[3] = zip->bcj2_prevByte = (uint8_t)(dest >> 24); 3841 3842 for (i = 0; i < 4 && outPos < outSize; i++) 3843 outBuf[outPos++] = out[i]; 3844 if (i < 4) { 3845 /* 3846 * Save odd bytes which we could not add into 3847 * the output buffer because of out of space. 3848 */ 3849 zip->odd_bcj_size = 4 -i; 3850 for (; i < 4; i++) { 3851 j = i - 4 + (unsigned)zip->odd_bcj_size; 3852 zip->odd_bcj[j] = out[i]; 3853 } 3854 break; 3855 } 3856 } 3857 } 3858 zip->tmp_stream_bytes_remaining -= inPos; 3859 zip->sub_stream_bytes_remaining[0] = size1; 3860 zip->sub_stream_bytes_remaining[1] = size2; 3861 zip->sub_stream_bytes_remaining[2] = bufferLim - buffer; 3862 zip->bcj2_outPos += outPos; 3863 3864 return ((ssize_t)outPos); 3865} 3866 3867