contrib/libarchive/libarchive/archive_read_support_format_7zip.c

   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
 113 struct _7z_digests {
 114         unsigned char   *defineds;
 115         uint32_t        *digests;
 116 };
 117
 118
 119 struct _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
 146 struct _7z_coders_info {
 147         uint64_t                 numFolders;
 148         struct _7z_folder       *folders;
 149         uint64_t                 dataStreamIndex;
 150 };
 151
 152 struct _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
 161 struct _7z_substream_info {
 162         size_t                   unpack_streams;
 163         uint64_t                *unpackSizes;
 164         unsigned char           *digestsDefined;
 165         uint32_t                *digests;
 166 };
 167
 168 struct _7z_stream_info {
 169         struct _7z_pack_info     pi;
 170         struct _7z_coders_info   ci;
 171         struct _7z_substream_info ss;
 172 };
 173
 174 struct _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
 183 struct _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
 208 struct _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
 340 static int      archive_read_format_7zip_has_encrypted_entries(struct archive_read *);
 341 static int      archive_read_support_format_7zip_capabilities(struct archive_read *a);
 342 static int      archive_read_format_7zip_bid(struct archive_read *, int);
 343 static int      archive_read_format_7zip_cleanup(struct archive_read *);
 344 static int      archive_read_format_7zip_read_data(struct archive_read *,
 345                     const void **, size_t *, int64_t *);
 346 static int      archive_read_format_7zip_read_data_skip(struct archive_read *);
 347 static int      archive_read_format_7zip_read_header(struct archive_read *,
 348                     struct archive_entry *);
 349 static int      check_7zip_header_in_sfx(const char *);
 350 static unsigned long decode_codec_id(const unsigned char *, size_t);
 351 static int      decode_encoded_header_info(struct archive_read *,
 352                     struct _7z_stream_info *);
 353 static int      decompress(struct archive_read *, struct _7zip *,
 354                     void *, size_t *, const void *, size_t *);
 355 static ssize_t  extract_pack_stream(struct archive_read *, size_t);
 356 static void     fileTimeToUtc(uint64_t, time_t *, long *);
 357 static uint64_t folder_uncompressed_size(struct _7z_folder *);
 358 static void     free_CodersInfo(struct _7z_coders_info *);
 359 static void     free_Digest(struct _7z_digests *);
 360 static void     free_Folder(struct _7z_folder *);
 361 static void     free_Header(struct _7z_header_info *);
 362 static void     free_PackInfo(struct _7z_pack_info *);
 363 static void     free_StreamsInfo(struct _7z_stream_info *);
 364 static void     free_SubStreamsInfo(struct _7z_substream_info *);
 365 static int      free_decompression(struct archive_read *, struct _7zip *);
 366 static ssize_t  get_uncompressed_data(struct archive_read *, const void **,
 367                     size_t, size_t);
 368 static const unsigned char * header_bytes(struct archive_read *, size_t);
 369 static int      init_decompression(struct archive_read *, struct _7zip *,
 370                     const struct _7z_coder *, const struct _7z_coder *);
 371 static int      parse_7zip_uint64(struct archive_read *, uint64_t *);
 372 static int      read_Bools(struct archive_read *, unsigned char *, size_t);
 373 static int      read_CodersInfo(struct archive_read *,
 374                     struct _7z_coders_info *);
 375 static int      read_Digests(struct archive_read *, struct _7z_digests *,
 376                     size_t);
 377 static int      read_Folder(struct archive_read *, struct _7z_folder *);
 378 static int      read_Header(struct archive_read *, struct _7z_header_info *,
 379                     int);
 380 static int      read_PackInfo(struct archive_read *, struct _7z_pack_info *);
 381 static int      read_StreamsInfo(struct archive_read *,
 382                     struct _7z_stream_info *);
 383 static int      read_SubStreamsInfo(struct archive_read *,
 384                     struct _7z_substream_info *, struct _7z_folder *, size_t);
 385 static int      read_Times(struct archive_read *, struct _7z_header_info *,
 386                     int);
 387 static void     read_consume(struct archive_read *);
 388 static ssize_t  read_stream(struct archive_read *, const void **, size_t,
 389                     size_t);
 390 static int      seek_pack(struct archive_read *);
 391 static int64_t  skip_stream(struct archive_read *, size_t);
 392 static int      skip_sfx(struct archive_read *, ssize_t);
 393 static int      slurp_central_directory(struct archive_read *, struct _7zip *,
 394                     struct _7z_header_info *);
 395 static int      setup_decode_folder(struct archive_read *, struct _7z_folder *,
 396                     int);
 397 static void     x86_Init(struct _7zip *);
 398 static size_t   x86_Convert(struct _7zip *, uint8_t *, size_t);
 399 static ssize_t          Bcj2_Decode(struct _7zip *, uint8_t *, size_t);
 400
 401
 402 int
 403 archive_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
 444 static int
 445 archive_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
 453 static int
 454 archive_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
 465 static int
 466 archive_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
 518 static int
 519 check_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
 544 static int
 545 skip_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         }
 603 fatal:
 604         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 605             "Couldn't find out 7-Zip header");
 606         return (ARCHIVE_FATAL);
 607 }
 608
 609 static int
 610 archive_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
 784 static int
 785 archive_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
 852 static int
 853 archive_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
 881 static int
 882 archive_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
 901 static void
 902 read_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  */
 918 static void
 919 set_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
 965 static unsigned long
 966 decode_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
 978 static Byte
 979 ppmd_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
 997 static int
 998 init_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
1293 static int
1294 decompress(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
1588 static int
1589 free_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
1631 static int
1632 parse_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
1657 static int
1658 read_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
1676 static void
1677 free_Digest(struct _7z_digests *d)
1678 {
1679         free(d->defineds);
1680         free(d->digests);
1681 }
1682
1683 static int
1684 read_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
1722 static void
1723 free_PackInfo(struct _7z_pack_info *pi)
1724 {
1725         free(pi->sizes);
1726         free(pi->positions);
1727         free_Digest(&(pi->digest));
1728 }
1729
1730 static int
1731 read_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
1806 static void
1807 free_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
1822 static int
1823 read_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
1965 static void
1966 free_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
1977 static int
1978 read_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);
2077 failed:
2078         free_Digest(&digest);
2079         return (-1);
2080 }
2081
2082 static uint64_t
2083 folder_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
2100 static void
2101 free_SubStreamsInfo(struct _7z_substream_info *ss)
2102 {
2103         free(ss->unpackSizes);
2104         free(ss->digestsDefined);
2105         free(ss->digests);
2106 }
2107
2108 static int
2109 read_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
2236 static void
2237 free_StreamsInfo(struct _7z_stream_info *si)
2238 {
2239         free_PackInfo(&(si->pi));
2240         free_CodersInfo(&(si->ci));
2241         free_SubStreamsInfo(&(si->ss));
2242 }
2243
2244 static int
2245 read_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
2314 static void
2315 free_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
2323 static int
2324 read_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)
2651 static void
2652 fileTimeToUtc(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
2667 static int
2668 read_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);
2731 failed:
2732         free(timeBools);
2733         return (-1);
2734 }
2735
2736 static int
2737 decode_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
2767 static const unsigned char *
2768 header_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
2800 static int
2801 slurp_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
2957 static ssize_t
2958 get_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                 /*
2968                  * Note: '1' here is a performance optimization.
2969                  * Recall that the decompression layer returns a count of
2970                  * available bytes; asking for more than that forces the
2971                  * decompressor to combine reads by copying data.
2972                  */
2973                 *buff = __archive_read_ahead(a, 1, &bytes_avail);
2974                 if (bytes_avail <= 0) {
2975                         archive_set_error(&a->archive,
2976                             ARCHIVE_ERRNO_FILE_FORMAT,
2977                             "Truncated 7-Zip file data");
2978                         return (ARCHIVE_FATAL);
2979                 }
2980                 if ((size_t)bytes_avail >
2981                     zip->uncompressed_buffer_bytes_remaining)
2982                         bytes_avail = (ssize_t)
2983                             zip->uncompressed_buffer_bytes_remaining;
2984                 if ((size_t)bytes_avail > size)
2985                         bytes_avail = (ssize_t)size;
2986
2987                 zip->pack_stream_bytes_unconsumed = bytes_avail;
2988         } else if (zip->uncompressed_buffer_pointer == NULL) {
2989                 /* Decompression has failed. */
2990                 archive_set_error(&(a->archive),
2991                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
2992                 return (ARCHIVE_FATAL);
2993         } else {
2994                 /* Packed mode. */
2995                 if (minimum > zip->uncompressed_buffer_bytes_remaining) {
2996                         /*
2997                          * If remaining uncompressed data size is less than
2998                          * the minimum size, fill the buffer up to the
2999                          * minimum size.
3000                          */
3001                         if (extract_pack_stream(a, minimum) < 0)
3002                                 return (ARCHIVE_FATAL);
3003                 }
3004                 if (size > zip->uncompressed_buffer_bytes_remaining)
3005                         bytes_avail = (ssize_t)
3006                             zip->uncompressed_buffer_bytes_remaining;
3007                 else
3008                         bytes_avail = (ssize_t)size;
3009                 *buff = zip->uncompressed_buffer_pointer;
3010                 zip->uncompressed_buffer_pointer += bytes_avail;
3011         }
3012         zip->uncompressed_buffer_bytes_remaining -= bytes_avail;
3013         return (bytes_avail);
3014 }
3015
3016 static ssize_t
3017 extract_pack_stream(struct archive_read *a, size_t minimum)
3018 {
3019         struct _7zip *zip = (struct _7zip *)a->format->data;
3020         ssize_t bytes_avail;
3021         int r;
3022
3023         if (zip->codec == _7Z_COPY && zip->codec2 == (unsigned long)-1) {
3024                 if (minimum == 0)
3025                         minimum = 1;
3026                 if (__archive_read_ahead(a, minimum, &bytes_avail) == NULL
3027                     || bytes_avail <= 0) {
3028                         archive_set_error(&a->archive,
3029                             ARCHIVE_ERRNO_FILE_FORMAT,
3030                             "Truncated 7-Zip file body");
3031                         return (ARCHIVE_FATAL);
3032                 }
3033                 if (bytes_avail > (ssize_t)zip->pack_stream_inbytes_remaining)
3034                         bytes_avail = (ssize_t)zip->pack_stream_inbytes_remaining;
3035                 zip->pack_stream_inbytes_remaining -= bytes_avail;
3036                 if (bytes_avail > (ssize_t)zip->folder_outbytes_remaining)
3037                         bytes_avail = (ssize_t)zip->folder_outbytes_remaining;
3038                 zip->folder_outbytes_remaining -= bytes_avail;
3039                 zip->uncompressed_buffer_bytes_remaining = bytes_avail;
3040                 return (ARCHIVE_OK);
3041         }
3042
3043         /* If the buffer hasn't been allocated, allocate it now. */
3044         if (zip->uncompressed_buffer == NULL) {
3045                 zip->uncompressed_buffer_size = UBUFF_SIZE;
3046                 if (zip->uncompressed_buffer_size < minimum) {
3047                         zip->uncompressed_buffer_size = minimum + 1023;
3048                         zip->uncompressed_buffer_size &= ~0x3ff;
3049                 }
3050                 zip->uncompressed_buffer =
3051                     malloc(zip->uncompressed_buffer_size);
3052                 if (zip->uncompressed_buffer == NULL) {
3053                         archive_set_error(&a->archive, ENOMEM,
3054                             "No memory for 7-Zip decompression");
3055                         return (ARCHIVE_FATAL);
3056                 }
3057                 zip->uncompressed_buffer_bytes_remaining = 0;
3058         } else if (zip->uncompressed_buffer_size < minimum ||
3059             zip->uncompressed_buffer_bytes_remaining < minimum) {
3060                 /*
3061                  * Make sure the uncompressed buffer can have bytes
3062                  * at least `minimum' bytes.
3063                  * NOTE: This case happen when reading the header.
3064                  */
3065                 size_t used;
3066                 if (zip->uncompressed_buffer_pointer != 0)
3067                         used = zip->uncompressed_buffer_pointer -
3068                                 zip->uncompressed_buffer;
3069                 else
3070                         used = 0;
3071                 if (zip->uncompressed_buffer_size < minimum) {
3072                         /*
3073                          * Expand the uncompressed buffer up to
3074                          * the minimum size.
3075                          */
3076                         void *p;
3077                         size_t new_size;
3078
3079                         new_size = minimum + 1023;
3080                         new_size &= ~0x3ff;
3081                         p = realloc(zip->uncompressed_buffer, new_size);
3082                         if (p == NULL) {
3083                                 archive_set_error(&a->archive, ENOMEM,
3084                                     "No memory for 7-Zip decompression");
3085                                 return (ARCHIVE_FATAL);
3086                         }
3087                         zip->uncompressed_buffer = (unsigned char *)p;
3088                         zip->uncompressed_buffer_size = new_size;
3089                 }
3090                 /*
3091                  * Move unconsumed bytes to the head.
3092                  */
3093                 if (used) {
3094                         memmove(zip->uncompressed_buffer,
3095                                 zip->uncompressed_buffer + used,
3096                                 zip->uncompressed_buffer_bytes_remaining);
3097                 }
3098         } else
3099                 zip->uncompressed_buffer_bytes_remaining = 0;
3100         zip->uncompressed_buffer_pointer = NULL;
3101         for (;;) {
3102                 size_t bytes_in, bytes_out;
3103                 const void *buff_in;
3104                 unsigned char *buff_out;
3105                 int end_of_data;
3106
3107                 /*
3108                  * Note: '1' here is a performance optimization.
3109                  * Recall that the decompression layer returns a count of
3110                  * available bytes; asking for more than that forces the
3111                  * decompressor to combine reads by copying data.
3112                  */
3113                 buff_in = __archive_read_ahead(a, 1, &bytes_avail);
3114                 if (bytes_avail <= 0) {
3115                         archive_set_error(&a->archive,
3116                             ARCHIVE_ERRNO_FILE_FORMAT,
3117                             "Truncated 7-Zip file body");
3118                         return (ARCHIVE_FATAL);
3119                 }
3120
3121                 buff_out = zip->uncompressed_buffer
3122                         + zip->uncompressed_buffer_bytes_remaining;
3123                 bytes_out = zip->uncompressed_buffer_size
3124                         - zip->uncompressed_buffer_bytes_remaining;
3125                 bytes_in = bytes_avail;
3126                 if (bytes_in > zip->pack_stream_inbytes_remaining)
3127                         bytes_in = (size_t)zip->pack_stream_inbytes_remaining;
3128                 /* Drive decompression. */
3129                 r = decompress(a, zip, buff_out, &bytes_out,
3130                         buff_in, &bytes_in);
3131                 switch (r) {
3132                 case ARCHIVE_OK:
3133                         end_of_data = 0;
3134                         break;
3135                 case ARCHIVE_EOF:
3136                         end_of_data = 1;
3137                         break;
3138                 default:
3139                         return (ARCHIVE_FATAL);
3140                 }
3141                 zip->pack_stream_inbytes_remaining -= bytes_in;
3142                 if (bytes_out > zip->folder_outbytes_remaining)
3143                         bytes_out = (size_t)zip->folder_outbytes_remaining;
3144                 zip->folder_outbytes_remaining -= bytes_out;
3145                 zip->uncompressed_buffer_bytes_remaining += bytes_out;
3146                 zip->pack_stream_bytes_unconsumed = bytes_in;
3147
3148                 /*
3149                  * Continue decompression until uncompressed_buffer is full.
3150                  */
3151                 if (zip->uncompressed_buffer_bytes_remaining ==
3152                     zip->uncompressed_buffer_size)
3153                         break;
3154                 if (zip->codec2 == _7Z_X86 && zip->odd_bcj_size &&
3155                     zip->uncompressed_buffer_bytes_remaining + 5 >
3156                     zip->uncompressed_buffer_size)
3157                         break;
3158                 if (zip->pack_stream_inbytes_remaining == 0 &&
3159                     zip->folder_outbytes_remaining == 0)
3160                         break;
3161                 if (end_of_data || (bytes_in == 0 && bytes_out == 0)) {
3162                         archive_set_error(&(a->archive),
3163                             ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3164                         return (ARCHIVE_FATAL);
3165                 }
3166                 read_consume(a);
3167         }
3168         if (zip->uncompressed_buffer_bytes_remaining < minimum) {
3169                 archive_set_error(&(a->archive),
3170                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3171                 return (ARCHIVE_FATAL);
3172         }
3173         zip->uncompressed_buffer_pointer = zip->uncompressed_buffer;
3174         return (ARCHIVE_OK);
3175 }
3176
3177 static int
3178 seek_pack(struct archive_read *a)
3179 {
3180         struct _7zip *zip = (struct _7zip *)a->format->data;
3181         int64_t pack_offset;
3182
3183         if (zip->pack_stream_remaining <= 0) {
3184                 archive_set_error(&(a->archive),
3185                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3186                 return (ARCHIVE_FATAL);
3187         }
3188         zip->pack_stream_inbytes_remaining =
3189             zip->si.pi.sizes[zip->pack_stream_index];
3190         pack_offset = zip->si.pi.positions[zip->pack_stream_index];
3191         if (zip->stream_offset != pack_offset) {
3192                 if (0 > __archive_read_seek(a, pack_offset + zip->seek_base,
3193                     SEEK_SET))
3194                         return (ARCHIVE_FATAL);
3195                 zip->stream_offset = pack_offset;
3196         }
3197         zip->pack_stream_index++;
3198         zip->pack_stream_remaining--;
3199         return (ARCHIVE_OK);
3200 }
3201
3202 static ssize_t
3203 read_stream(struct archive_read *a, const void **buff, size_t size,
3204     size_t minimum)
3205 {
3206         struct _7zip *zip = (struct _7zip *)a->format->data;
3207         uint64_t skip_bytes = 0;
3208         ssize_t r;
3209
3210         if (zip->uncompressed_buffer_bytes_remaining == 0) {
3211                 if (zip->pack_stream_inbytes_remaining > 0) {
3212                         r = extract_pack_stream(a, 0);
3213                         if (r < 0)
3214                                 return (r);
3215                         return (get_uncompressed_data(a, buff, size, minimum));
3216                 } else if (zip->folder_outbytes_remaining > 0) {
3217                         /* Extract a remaining pack stream. */
3218                         r = extract_pack_stream(a, 0);
3219                         if (r < 0)
3220                                 return (r);
3221                         return (get_uncompressed_data(a, buff, size, minimum));
3222                 }
3223         } else
3224                 return (get_uncompressed_data(a, buff, size, minimum));
3225
3226         /*
3227          * Current pack stream has been consumed.
3228          */
3229         if (zip->pack_stream_remaining == 0) {
3230                 if (zip->header_is_being_read) {
3231                         /* Invalid sequence. This might happen when
3232                          * reading a malformed archive. */
3233                         archive_set_error(&(a->archive),
3234                             ARCHIVE_ERRNO_MISC, "Malformed 7-Zip archive");
3235                         return (ARCHIVE_FATAL);
3236                 }
3237
3238                 /*
3239                  * All current folder's pack streams have been
3240                  * consumed. Switch to next folder.
3241                  */
3242                 if (zip->folder_index == 0 &&
3243                     (zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes
3244                      || zip->folder_index != zip->entry->folderIndex)) {
3245                         zip->folder_index = zip->entry->folderIndex;
3246                         skip_bytes =
3247                             zip->si.ci.folders[zip->folder_index].skipped_bytes;
3248                 }
3249
3250                 if (zip->folder_index >= zip->si.ci.numFolders) {
3251                         /*
3252                          * We have consumed all folders and its pack streams.
3253                          */
3254                         *buff = NULL;
3255                         return (0);
3256                 }
3257                 r = setup_decode_folder(a,
3258                         &(zip->si.ci.folders[zip->folder_index]), 0);
3259                 if (r != ARCHIVE_OK)
3260                         return (ARCHIVE_FATAL);
3261
3262                 zip->folder_index++;
3263         }
3264
3265         /*
3266          * Switch to next pack stream.
3267          */
3268         r = seek_pack(a);
3269         if (r < 0)
3270                 return (r);
3271
3272         /* Extract a new pack stream. */
3273         r = extract_pack_stream(a, 0);
3274         if (r < 0)
3275                 return (r);
3276
3277         /*
3278          * Skip the bytes we already has skipped in skip_stream().
3279          */
3280         while (skip_bytes) {
3281                 ssize_t skipped;
3282
3283                 if (zip->uncompressed_buffer_bytes_remaining == 0) {
3284                         if (zip->pack_stream_inbytes_remaining > 0) {
3285                                 r = extract_pack_stream(a, 0);
3286                                 if (r < 0)
3287                                         return (r);
3288                         } else if (zip->folder_outbytes_remaining > 0) {
3289                                 /* Extract a remaining pack stream. */
3290                                 r = extract_pack_stream(a, 0);
3291                                 if (r < 0)
3292                                         return (r);
3293                         } else {
3294                                 archive_set_error(&a->archive,
3295                                     ARCHIVE_ERRNO_FILE_FORMAT,
3296                                     "Truncated 7-Zip file body");
3297                                 return (ARCHIVE_FATAL);
3298                         }
3299                 }
3300                 skipped = get_uncompressed_data(
3301                         a, buff, (size_t)skip_bytes, 0);
3302                 if (skipped < 0)
3303                         return (skipped);
3304                 skip_bytes -= skipped;
3305                 if (zip->pack_stream_bytes_unconsumed)
3306                         read_consume(a);
3307         }
3308
3309         return (get_uncompressed_data(a, buff, size, minimum));
3310 }
3311
3312 static int
3313 setup_decode_folder(struct archive_read *a, struct _7z_folder *folder,
3314     int header)
3315 {
3316         struct _7zip *zip = (struct _7zip *)a->format->data;
3317         const struct _7z_coder *coder1, *coder2;
3318         const char *cname = (header)?"archive header":"file content";
3319         unsigned i;
3320         int r, found_bcj2 = 0;
3321
3322         /*
3323          * Release the memory which the previous folder used for BCJ2.
3324          */
3325         for (i = 0; i < 3; i++) {
3326                 if (zip->sub_stream_buff[i] != NULL)
3327                         free(zip->sub_stream_buff[i]);
3328                 zip->sub_stream_buff[i] = NULL;
3329         }
3330
3331         /*
3332          * Initialize a stream reader.
3333          */
3334         zip->pack_stream_remaining = (unsigned)folder->numPackedStreams;
3335         zip->pack_stream_index = (unsigned)folder->packIndex;
3336         zip->folder_outbytes_remaining = folder_uncompressed_size(folder);
3337         zip->uncompressed_buffer_bytes_remaining = 0;
3338
3339         /*
3340          * Check coder types.
3341          */
3342         for (i = 0; i < folder->numCoders; i++) {
3343                 switch(folder->coders[i].codec) {
3344                         case _7Z_CRYPTO_MAIN_ZIP:
3345                         case _7Z_CRYPTO_RAR_29:
3346                         case _7Z_CRYPTO_AES_256_SHA_256: {
3347                                 /* For entry that is associated with this folder, mark
3348                                    it as encrypted (data+metadata). */
3349                                 zip->has_encrypted_entries = 1;
3350                                 if (a->entry) {
3351                                         archive_entry_set_is_data_encrypted(a->entry, 1);
3352                                         archive_entry_set_is_metadata_encrypted(a->entry, 1);
3353                                 }
3354                                 archive_set_error(&(a->archive),
3355                                         ARCHIVE_ERRNO_MISC,
3356                                         "The %s is encrypted, "
3357                                         "but currently not supported", cname);
3358                                 return (ARCHIVE_FATAL);
3359                         }
3360                         case _7Z_X86_BCJ2: {
3361                                 found_bcj2++;
3362                                 break;
3363                         }
3364                 }
3365         }
3366         /* Now that we've checked for encryption, if there were still no
3367          * encrypted entries found we can say for sure that there are none.
3368          */
3369         if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
3370                 zip->has_encrypted_entries = 0;
3371         }
3372
3373         if ((folder->numCoders > 2 && !found_bcj2) || found_bcj2 > 1) {
3374                 archive_set_error(&(a->archive),
3375                     ARCHIVE_ERRNO_MISC,
3376                     "The %s is encoded with many filters, "
3377                     "but currently not supported", cname);
3378                 return (ARCHIVE_FATAL);
3379         }
3380         coder1 = &(folder->coders[0]);
3381         if (folder->numCoders == 2)
3382                 coder2 = &(folder->coders[1]);
3383         else
3384                 coder2 = NULL;
3385
3386         if (found_bcj2) {
3387                 /*
3388                  * Preparation to decode BCJ2.
3389                  * Decoding BCJ2 requires four sources. Those are at least,
3390                  * as far as I know, two types of the storage form.
3391                  */
3392                 const struct _7z_coder *fc = folder->coders;
3393                 static const struct _7z_coder coder_copy = {0, 1, 1, 0, NULL};
3394                 const struct _7z_coder *scoder[3] =
3395                         {&coder_copy, &coder_copy, &coder_copy};
3396                 const void *buff;
3397                 ssize_t bytes;
3398                 unsigned char *b[3] = {NULL, NULL, NULL};
3399                 uint64_t sunpack[3] ={-1, -1, -1};
3400                 size_t s[3] = {0, 0, 0};
3401                 int idx[3] = {0, 1, 2};
3402
3403                 if (folder->numCoders == 4 && fc[3].codec == _7Z_X86_BCJ2 &&
3404                     folder->numInStreams == 7 && folder->numOutStreams == 4 &&
3405                     zip->pack_stream_remaining == 4) {
3406                         /* Source type 1 made by 7zr or 7z with -m options. */
3407                         if (folder->bindPairs[0].inIndex == 5) {
3408                                 /* The form made by 7zr */
3409                                 idx[0] = 1; idx[1] = 2; idx[2] = 0;
3410                                 scoder[1] = &(fc[1]);
3411                                 scoder[2] = &(fc[0]);
3412                                 sunpack[1] = folder->unPackSize[1];
3413                                 sunpack[2] = folder->unPackSize[0];
3414                                 coder1 = &(fc[2]);
3415                         } else {
3416                                 /*
3417                                  * NOTE: Some patterns do not work.
3418                                  * work:
3419                                  *  7z a -m0=BCJ2 -m1=COPY -m2=COPY
3420                                  *       -m3=(any)
3421                                  *  7z a -m0=BCJ2 -m1=COPY -m2=(any)
3422                                  *       -m3=COPY
3423                                  *  7z a -m0=BCJ2 -m1=(any) -m2=COPY
3424                                  *       -m3=COPY
3425                                  * not work:
3426                                  *  other patterns.
3427                                  *
3428                                  * We have to handle this like `pipe' or
3429                                  * our libarchive7s filter frame work,
3430                                  * decoding the BCJ2 main stream sequentially,
3431                                  * m3 -> m2 -> m1 -> BCJ2.
3432                                  *
3433                                  */
3434                                 if (fc[0].codec == _7Z_COPY &&
3435                                     fc[1].codec == _7Z_COPY)
3436                                         coder1 = &(folder->coders[2]);
3437                                 else if (fc[0].codec == _7Z_COPY &&
3438                                     fc[2].codec == _7Z_COPY)
3439                                         coder1 = &(folder->coders[1]);
3440                                 else if (fc[1].codec == _7Z_COPY &&
3441                                     fc[2].codec == _7Z_COPY)
3442                                         coder1 = &(folder->coders[0]);
3443                                 else {
3444                                         archive_set_error(&(a->archive),
3445                                             ARCHIVE_ERRNO_MISC,
3446                                             "Unsupported form of "
3447                                             "BCJ2 streams");
3448                                         return (ARCHIVE_FATAL);
3449                                 }
3450                         }
3451                         coder2 = &(fc[3]);
3452                         zip->main_stream_bytes_remaining =
3453                                 (size_t)folder->unPackSize[2];
3454                 } else if (coder2 != NULL && coder2->codec == _7Z_X86_BCJ2 &&
3455                     zip->pack_stream_remaining == 4 &&
3456                     folder->numInStreams == 5 && folder->numOutStreams == 2) {
3457                         /* Source type 0 made by 7z */
3458                         zip->main_stream_bytes_remaining =
3459                                 (size_t)folder->unPackSize[0];
3460                 } else {
3461                         /* We got an unexpected form. */
3462                         archive_set_error(&(a->archive),
3463                             ARCHIVE_ERRNO_MISC,
3464                             "Unsupported form of BCJ2 streams");
3465                         return (ARCHIVE_FATAL);
3466                 }
3467
3468                 /* Skip the main stream at this time. */
3469                 if ((r = seek_pack(a)) < 0)
3470                         return (r);
3471                 zip->pack_stream_bytes_unconsumed =
3472                     (size_t)zip->pack_stream_inbytes_remaining;
3473                 read_consume(a);
3474
3475                 /* Read following three sub streams. */
3476                 for (i = 0; i < 3; i++) {
3477                         const struct _7z_coder *coder = scoder[i];
3478
3479                         if ((r = seek_pack(a)) < 0) {
3480                                 free(b[0]); free(b[1]); free(b[2]);
3481                                 return (r);
3482                         }
3483
3484                         if (sunpack[i] == (uint64_t)-1)
3485                                 zip->folder_outbytes_remaining =
3486                                     zip->pack_stream_inbytes_remaining;
3487                         else
3488                                 zip->folder_outbytes_remaining = sunpack[i];
3489
3490                         r = init_decompression(a, zip, coder, NULL);
3491                         if (r != ARCHIVE_OK) {
3492                                 free(b[0]); free(b[1]); free(b[2]);
3493                                 return (ARCHIVE_FATAL);
3494                         }
3495
3496                         /* Allocate memory for the decoded data of a sub
3497                          * stream. */
3498                         b[i] = malloc((size_t)zip->folder_outbytes_remaining);
3499                         if (b[i] == NULL) {
3500                                 free(b[0]); free(b[1]); free(b[2]);
3501                                 archive_set_error(&a->archive, ENOMEM,
3502                                     "No memory for 7-Zip decompression");
3503                                 return (ARCHIVE_FATAL);
3504                         }
3505
3506                         /* Extract a sub stream. */
3507                         while (zip->pack_stream_inbytes_remaining > 0) {
3508                                 r = (int)extract_pack_stream(a, 0);
3509                                 if (r < 0) {
3510                                         free(b[0]); free(b[1]); free(b[2]);
3511                                         return (r);
3512                                 }
3513                                 bytes = get_uncompressed_data(a, &buff,
3514                                     zip->uncompressed_buffer_bytes_remaining,
3515                                     0);
3516                                 if (bytes < 0) {
3517                                         free(b[0]); free(b[1]); free(b[2]);
3518                                         return ((int)bytes);
3519                                 }
3520                                 memcpy(b[i]+s[i], buff, bytes);
3521                                 s[i] += bytes;
3522                                 if (zip->pack_stream_bytes_unconsumed)
3523                                         read_consume(a);
3524                         }
3525                 }
3526
3527                 /* Set the sub streams to the right place. */
3528                 for (i = 0; i < 3; i++) {
3529                         zip->sub_stream_buff[i] = b[idx[i]];
3530                         zip->sub_stream_size[i] = s[idx[i]];
3531                         zip->sub_stream_bytes_remaining[i] = s[idx[i]];
3532                 }
3533
3534                 /* Allocate memory used for decoded main stream bytes. */
3535                 if (zip->tmp_stream_buff == NULL) {
3536                         zip->tmp_stream_buff_size = 32 * 1024;
3537                         zip->tmp_stream_buff =
3538                             malloc(zip->tmp_stream_buff_size);
3539                         if (zip->tmp_stream_buff == NULL) {
3540                                 archive_set_error(&a->archive, ENOMEM,
3541                                     "No memory for 7-Zip decompression");
3542                                 return (ARCHIVE_FATAL);
3543                         }
3544                 }
3545                 zip->tmp_stream_bytes_avail = 0;
3546                 zip->tmp_stream_bytes_remaining = 0;
3547                 zip->odd_bcj_size = 0;
3548                 zip->bcj2_outPos = 0;
3549
3550                 /*
3551                  * Reset a stream reader in order to read the main stream
3552                  * of BCJ2.
3553                  */
3554                 zip->pack_stream_remaining = 1;
3555                 zip->pack_stream_index = (unsigned)folder->packIndex;
3556                 zip->folder_outbytes_remaining =
3557                     folder_uncompressed_size(folder);
3558                 zip->uncompressed_buffer_bytes_remaining = 0;
3559         }
3560
3561         /*
3562          * Initialize the decompressor for the new folder's pack streams.
3563          */
3564         r = init_decompression(a, zip, coder1, coder2);
3565         if (r != ARCHIVE_OK)
3566                 return (ARCHIVE_FATAL);
3567         return (ARCHIVE_OK);
3568 }
3569
3570 static int64_t
3571 skip_stream(struct archive_read *a, size_t skip_bytes)
3572 {
3573         struct _7zip *zip = (struct _7zip *)a->format->data;
3574         const void *p;
3575         int64_t skipped_bytes;
3576         size_t bytes = skip_bytes;
3577
3578         if (zip->folder_index == 0) {
3579                 /*
3580                  * Optimization for a list mode.
3581                  * Avoid unnecessary decoding operations.
3582                  */
3583                 zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes
3584                     += skip_bytes;
3585                 return (skip_bytes);
3586         }
3587
3588         while (bytes) {
3589                 skipped_bytes = read_stream(a, &p, bytes, 0);
3590                 if (skipped_bytes < 0)
3591                         return (skipped_bytes);
3592                 if (skipped_bytes == 0) {
3593                         archive_set_error(&a->archive,
3594                             ARCHIVE_ERRNO_FILE_FORMAT,
3595                             "Truncated 7-Zip file body");
3596                         return (ARCHIVE_FATAL);
3597                 }
3598                 bytes -= (size_t)skipped_bytes;
3599                 if (zip->pack_stream_bytes_unconsumed)
3600                         read_consume(a);
3601         }
3602         return (skip_bytes);
3603 }
3604
3605 /*
3606  * Brought from LZMA SDK.
3607  *
3608  * Bra86.c -- Converter for x86 code (BCJ)
3609  * 2008-10-04 : Igor Pavlov : Public domain
3610  *
3611  */
3612
3613 #define Test86MSByte(b) ((b) == 0 || (b) == 0xFF)
3614
3615 static void
3616 x86_Init(struct _7zip *zip)
3617 {
3618         zip->bcj_state = 0;
3619         zip->bcj_prevPosT = (size_t)0 - 1;
3620         zip->bcj_prevMask = 0;
3621         zip->bcj_ip = 5;
3622 }
3623
3624 static size_t
3625 x86_Convert(struct _7zip *zip, uint8_t *data, size_t size)
3626 {
3627         static const uint8_t kMaskToAllowedStatus[8] = {1, 1, 1, 0, 1, 0, 0, 0};
3628         static const uint8_t kMaskToBitNumber[8] = {0, 1, 2, 2, 3, 3, 3, 3};
3629         size_t bufferPos, prevPosT;
3630         uint32_t ip, prevMask;
3631
3632         if (size < 5)
3633                 return 0;
3634
3635         bufferPos = 0;
3636         prevPosT = zip->bcj_prevPosT;
3637         prevMask = zip->bcj_prevMask;
3638         ip = zip->bcj_ip;
3639
3640         for (;;) {
3641                 uint8_t *p = data + bufferPos;
3642                 uint8_t *limit = data + size - 4;
3643
3644                 for (; p < limit; p++)
3645                         if ((*p & 0xFE) == 0xE8)
3646                                 break;
3647                 bufferPos = (size_t)(p - data);
3648                 if (p >= limit)
3649                         break;
3650                 prevPosT = bufferPos - prevPosT;
3651                 if (prevPosT > 3)
3652                         prevMask = 0;
3653                 else {
3654                         prevMask = (prevMask << ((int)prevPosT - 1)) & 0x7;
3655                         if (prevMask != 0) {
3656                                 unsigned char b =
3657                                         p[4 - kMaskToBitNumber[prevMask]];
3658                                 if (!kMaskToAllowedStatus[prevMask] ||
3659                                     Test86MSByte(b)) {
3660                                         prevPosT = bufferPos;
3661                                         prevMask = ((prevMask << 1) & 0x7) | 1;
3662                                         bufferPos++;
3663                                         continue;
3664                                 }
3665                         }
3666                 }
3667                 prevPosT = bufferPos;
3668
3669                 if (Test86MSByte(p[4])) {
3670                         uint32_t src = ((uint32_t)p[4] << 24) |
3671                                 ((uint32_t)p[3] << 16) | ((uint32_t)p[2] << 8) |
3672                                 ((uint32_t)p[1]);
3673                         uint32_t dest;
3674                         for (;;) {
3675                                 uint8_t b;
3676                                 int b_index;
3677
3678                                 dest = src - (ip + (uint32_t)bufferPos);
3679                                 if (prevMask == 0)
3680                                         break;
3681                                 b_index = kMaskToBitNumber[prevMask] * 8;
3682                                 b = (uint8_t)(dest >> (24 - b_index));
3683                                 if (!Test86MSByte(b))
3684                                         break;
3685                                 src = dest ^ ((1 << (32 - b_index)) - 1);
3686                         }
3687                         p[4] = (uint8_t)(~(((dest >> 24) & 1) - 1));
3688                         p[3] = (uint8_t)(dest >> 16);
3689                         p[2] = (uint8_t)(dest >> 8);
3690                         p[1] = (uint8_t)dest;
3691                         bufferPos += 5;
3692                 } else {
3693                         prevMask = ((prevMask << 1) & 0x7) | 1;
3694                         bufferPos++;
3695                 }
3696         }
3697         zip->bcj_prevPosT = prevPosT;
3698         zip->bcj_prevMask = prevMask;
3699         zip->bcj_ip += (uint32_t)bufferPos;
3700         return (bufferPos);
3701 }
3702
3703 /*
3704  * Brought from LZMA SDK.
3705  *
3706  * Bcj2.c -- Converter for x86 code (BCJ2)
3707  * 2008-10-04 : Igor Pavlov : Public domain
3708  *
3709  */
3710
3711 #define SZ_ERROR_DATA    ARCHIVE_FAILED
3712
3713 #define IsJcc(b0, b1) ((b0) == 0x0F && ((b1) & 0xF0) == 0x80)
3714 #define IsJ(b0, b1) ((b1 & 0xFE) == 0xE8 || IsJcc(b0, b1))
3715
3716 #define kNumTopBits 24
3717 #define kTopValue ((uint32_t)1 << kNumTopBits)
3718
3719 #define kNumBitModelTotalBits 11
3720 #define kBitModelTotal (1 << kNumBitModelTotalBits)
3721 #define kNumMoveBits 5
3722
3723 #define RC_READ_BYTE (*buffer++)
3724 #define RC_TEST { if (buffer == bufferLim) return SZ_ERROR_DATA; }
3725 #define RC_INIT2 zip->bcj2_code = 0; zip->bcj2_range = 0xFFFFFFFF; \
3726   { int ii; for (ii = 0; ii < 5; ii++) { RC_TEST; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; }}
3727
3728 #define NORMALIZE if (zip->bcj2_range < kTopValue) { RC_TEST; zip->bcj2_range <<= 8; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; }
3729
3730 #define IF_BIT_0(p) ttt = *(p); bound = (zip->bcj2_range >> kNumBitModelTotalBits) * ttt; if (zip->bcj2_code < bound)
3731 #define UPDATE_0(p) zip->bcj2_range = bound; *(p) = (CProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits)); NORMALIZE;
3732 #define UPDATE_1(p) zip->bcj2_range -= bound; zip->bcj2_code -= bound; *(p) = (CProb)(ttt - (ttt >> kNumMoveBits)); NORMALIZE;
3733
3734 static ssize_t
3735 Bcj2_Decode(struct _7zip *zip, uint8_t *outBuf, size_t outSize)
3736 {
3737         size_t inPos = 0, outPos = 0;
3738         const uint8_t *buf0, *buf1, *buf2, *buf3;
3739         size_t size0, size1, size2, size3;
3740         const uint8_t *buffer, *bufferLim;
3741         unsigned int i, j;
3742
3743         size0 = zip->tmp_stream_bytes_remaining;
3744         buf0 = zip->tmp_stream_buff + zip->tmp_stream_bytes_avail - size0;
3745         size1 = zip->sub_stream_bytes_remaining[0];
3746         buf1 = zip->sub_stream_buff[0] + zip->sub_stream_size[0] - size1;
3747         size2 = zip->sub_stream_bytes_remaining[1];
3748         buf2 = zip->sub_stream_buff[1] + zip->sub_stream_size[1] - size2;
3749         size3 = zip->sub_stream_bytes_remaining[2];
3750         buf3 = zip->sub_stream_buff[2] + zip->sub_stream_size[2] - size3;
3751
3752         buffer = buf3;
3753         bufferLim = buffer + size3;
3754
3755         if (zip->bcj_state == 0) {
3756                 /*
3757                  * Initialize.
3758                  */
3759                 zip->bcj2_prevByte = 0;
3760                 for (i = 0;
3761                     i < sizeof(zip->bcj2_p) / sizeof(zip->bcj2_p[0]); i++)
3762                         zip->bcj2_p[i] = kBitModelTotal >> 1;
3763                 RC_INIT2;
3764                 zip->bcj_state = 1;
3765         }
3766
3767         /*
3768          * Gather the odd bytes of a previous call.
3769          */
3770         for (i = 0; zip->odd_bcj_size > 0 && outPos < outSize; i++) {
3771                 outBuf[outPos++] = zip->odd_bcj[i];
3772                 zip->odd_bcj_size--;
3773         }
3774
3775         if (outSize == 0) {
3776                 zip->bcj2_outPos += outPos;
3777                 return (outPos);
3778         }
3779
3780         for (;;) {
3781                 uint8_t b;
3782                 CProb *prob;
3783                 uint32_t bound;
3784                 uint32_t ttt;
3785
3786                 size_t limit = size0 - inPos;
3787                 if (outSize - outPos < limit)
3788                         limit = outSize - outPos;
3789
3790                 if (zip->bcj_state == 1) {
3791                         while (limit != 0) {
3792                                 uint8_t bb = buf0[inPos];
3793                                 outBuf[outPos++] = bb;
3794                                 if (IsJ(zip->bcj2_prevByte, bb)) {
3795                                         zip->bcj_state = 2;
3796                                         break;
3797                                 }
3798                                 inPos++;
3799                                 zip->bcj2_prevByte = bb;
3800                                 limit--;
3801                         }
3802                 }
3803
3804                 if (limit == 0 || outPos == outSize)
3805                         break;
3806                 zip->bcj_state = 1;
3807
3808                 b = buf0[inPos++];
3809
3810                 if (b == 0xE8)
3811                         prob = zip->bcj2_p + zip->bcj2_prevByte;
3812                 else if (b == 0xE9)
3813                         prob = zip->bcj2_p + 256;
3814                 else
3815                         prob = zip->bcj2_p + 257;
3816
3817                 IF_BIT_0(prob) {
3818                         UPDATE_0(prob)
3819                         zip->bcj2_prevByte = b;
3820                 } else {
3821                         uint32_t dest;
3822                         const uint8_t *v;
3823                         uint8_t out[4];
3824
3825                         UPDATE_1(prob)
3826                         if (b == 0xE8) {
3827                                 v = buf1;
3828                                 if (size1 < 4)
3829                                         return SZ_ERROR_DATA;
3830                                 buf1 += 4;
3831                                 size1 -= 4;
3832                         } else {
3833                                 v = buf2;
3834                                 if (size2 < 4)
3835                                         return SZ_ERROR_DATA;
3836                                 buf2 += 4;
3837                                 size2 -= 4;
3838                         }
3839                         dest = (((uint32_t)v[0] << 24) |
3840                             ((uint32_t)v[1] << 16) |
3841                             ((uint32_t)v[2] << 8) |
3842                             ((uint32_t)v[3])) -
3843                             ((uint32_t)zip->bcj2_outPos + (uint32_t)outPos + 4);
3844                         out[0] = (uint8_t)dest;
3845                         out[1] = (uint8_t)(dest >> 8);
3846                         out[2] = (uint8_t)(dest >> 16);
3847                         out[3] = zip->bcj2_prevByte = (uint8_t)(dest >> 24);
3848
3849                         for (i = 0; i < 4 && outPos < outSize; i++)
3850                                 outBuf[outPos++] = out[i];
3851                         if (i < 4) {
3852                                 /*
3853                                  * Save odd bytes which we could not add into
3854                                  * the output buffer because of out of space.
3855                                  */
3856                                 zip->odd_bcj_size = 4 -i;
3857                                 for (; i < 4; i++) {
3858                                         j = i - 4 + (unsigned)zip->odd_bcj_size;
3859                                         zip->odd_bcj[j] = out[i];
3860                                 }
3861                                 break;
3862                         }
3863                 }
3864         }
3865         zip->tmp_stream_bytes_remaining -= inPos;
3866         zip->sub_stream_bytes_remaining[0] = size1;
3867         zip->sub_stream_bytes_remaining[1] = size2;
3868         zip->sub_stream_bytes_remaining[2] = bufferLim - buffer;
3869         zip->bcj2_outPos += outPos;
3870
3871         return ((ssize_t)outPos);
3872 }
3873