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 pointes of the file contens
 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         /* Decording LZMA1 and LZMA2 data. */
 267 #ifdef HAVE_LZMA_H
 268         lzma_stream              lzstream;
 269         int                      lzstream_valid;
 270 #endif
 271         /* Decording bzip2 data. */
 272 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
 273         bz_stream                bzstream;
 274         int                      bzstream_valid;
 275 #endif
 276         /* Decording deflate data. */
 277 #ifdef HAVE_ZLIB_H
 278         z_stream                 stream;
 279         int                      stream_valid;
 280 #endif
 281         /* Decording 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          * alredy 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 synname, 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 void *
 979 ppmd_alloc(void *p, size_t size)
 980 {
 981         (void)p;
 982         return malloc(size);
 983 }
 984 static void
 985 ppmd_free(void *p, void *address)
 986 {
 987         (void)p;
 988         free(address);
 989 }
 990 static Byte
 991 ppmd_read(void *p)
 992 {
 993         struct archive_read *a = ((IByteIn*)p)->a;
 994         struct _7zip *zip = (struct _7zip *)(a->format->data);
 995         Byte b;
 996
 997         if (zip->ppstream.avail_in == 0) {
 998                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 999                     "Truncated RAR file data");
1000                 zip->ppstream.overconsumed = 1;
1001                 return (0);
1002         }
1003         b = *zip->ppstream.next_in++;
1004         zip->ppstream.avail_in--;
1005         zip->ppstream.total_in++;
1006         return (b);
1007 }
1008
1009 static ISzAlloc g_szalloc = { ppmd_alloc, ppmd_free };
1010
1011 static int
1012 init_decompression(struct archive_read *a, struct _7zip *zip,
1013     const struct _7z_coder *coder1, const struct _7z_coder *coder2)
1014 {
1015         int r;
1016
1017         zip->codec = coder1->codec;
1018         zip->codec2 = -1;
1019
1020         switch (zip->codec) {
1021         case _7Z_COPY:
1022         case _7Z_BZ2:
1023         case _7Z_DEFLATE:
1024         case _7Z_PPMD:
1025                 if (coder2 != NULL) {
1026                         if (coder2->codec != _7Z_X86 &&
1027                             coder2->codec != _7Z_X86_BCJ2) {
1028                                 archive_set_error(&a->archive,
1029                                     ARCHIVE_ERRNO_MISC,
1030                                     "Unsupported filter %lx for %lx",
1031                                     coder2->codec, coder1->codec);
1032                                 return (ARCHIVE_FAILED);
1033                         }
1034                         zip->codec2 = coder2->codec;
1035                         zip->bcj_state = 0;
1036                         if (coder2->codec == _7Z_X86)
1037                                 x86_Init(zip);
1038                 }
1039                 break;
1040         default:
1041                 break;
1042         }
1043
1044         switch (zip->codec) {
1045         case _7Z_COPY:
1046                 break;
1047
1048         case _7Z_LZMA: case _7Z_LZMA2:
1049 #ifdef HAVE_LZMA_H
1050 #if LZMA_VERSION_MAJOR >= 5
1051 /* Effectively disable the limiter. */
1052 #define LZMA_MEMLIMIT   UINT64_MAX
1053 #else
1054 /* NOTE: This needs to check memory size which running system has. */
1055 #define LZMA_MEMLIMIT   (1U << 30)
1056 #endif
1057         {
1058                 lzma_options_delta delta_opt;
1059                 lzma_filter filters[LZMA_FILTERS_MAX];
1060 #if LZMA_VERSION < 50010000
1061                 lzma_filter *ff;
1062 #endif
1063                 int fi = 0;
1064
1065                 if (zip->lzstream_valid) {
1066                         lzma_end(&(zip->lzstream));
1067                         zip->lzstream_valid = 0;
1068                 }
1069
1070                 /*
1071                  * NOTE: liblzma incompletely handle the BCJ+LZMA compressed
1072                  * data made by 7-Zip because 7-Zip does not add End-Of-
1073                  * Payload Marker(EOPM) at the end of LZMA compressed data,
1074                  * and so liblzma cannot know the end of the compressed data
1075                  * without EOPM. So consequently liblzma will not return last
1076                  * three or four bytes of uncompressed data because
1077                  * LZMA_FILTER_X86 filter does not handle input data if its
1078                  * data size is less than five bytes. If liblzma detect EOPM
1079                  * or know the uncompressed data size, liblzma will flush out
1080                  * the remaining that three or four bytes of uncompressed
1081                  * data. That is why we have to use our converting program
1082                  * for BCJ+LZMA. If we were able to tell the uncompressed
1083                  * size to liblzma when using lzma_raw_decoder() liblzma
1084                  * could correctly deal with BCJ+LZMA. But unfortunately
1085                  * there is no way to do that.
1086                  * Discussion about this can be found at XZ Utils forum.
1087                  */
1088                 if (coder2 != NULL) {
1089                         zip->codec2 = coder2->codec;
1090
1091                         filters[fi].options = NULL;
1092                         switch (zip->codec2) {
1093                         case _7Z_X86:
1094                                 if (zip->codec == _7Z_LZMA2) {
1095                                         filters[fi].id = LZMA_FILTER_X86;
1096                                         fi++;
1097                                 } else
1098                                         /* Use our filter. */
1099                                         x86_Init(zip);
1100                                 break;
1101                         case _7Z_X86_BCJ2:
1102                                 /* Use our filter. */
1103                                 zip->bcj_state = 0;
1104                                 break;
1105                         case _7Z_DELTA:
1106                                 filters[fi].id = LZMA_FILTER_DELTA;
1107                                 memset(&delta_opt, 0, sizeof(delta_opt));
1108                                 delta_opt.type = LZMA_DELTA_TYPE_BYTE;
1109                                 delta_opt.dist = 1;
1110                                 filters[fi].options = &delta_opt;
1111                                 fi++;
1112                                 break;
1113                         /* Following filters have not been tested yet. */
1114                         case _7Z_POWERPC:
1115                                 filters[fi].id = LZMA_FILTER_POWERPC;
1116                                 fi++;
1117                                 break;
1118                         case _7Z_IA64:
1119                                 filters[fi].id = LZMA_FILTER_IA64;
1120                                 fi++;
1121                                 break;
1122                         case _7Z_ARM:
1123                                 filters[fi].id = LZMA_FILTER_ARM;
1124                                 fi++;
1125                                 break;
1126                         case _7Z_ARMTHUMB:
1127                                 filters[fi].id = LZMA_FILTER_ARMTHUMB;
1128                                 fi++;
1129                                 break;
1130                         case _7Z_SPARC:
1131                                 filters[fi].id = LZMA_FILTER_SPARC;
1132                                 fi++;
1133                                 break;
1134                         default:
1135                                 archive_set_error(&a->archive,
1136                                     ARCHIVE_ERRNO_MISC,
1137                                     "Unexpected codec ID: %lX", zip->codec2);
1138                                 return (ARCHIVE_FAILED);
1139                         }
1140                 }
1141
1142                 if (zip->codec == _7Z_LZMA2)
1143                         filters[fi].id = LZMA_FILTER_LZMA2;
1144                 else
1145                         filters[fi].id = LZMA_FILTER_LZMA1;
1146                 filters[fi].options = NULL;
1147 #if LZMA_VERSION < 50010000
1148                 ff = &filters[fi];
1149 #endif
1150                 r = lzma_properties_decode(&filters[fi], NULL,
1151                     coder1->properties, (size_t)coder1->propertiesSize);
1152                 if (r != LZMA_OK) {
1153                         set_error(a, r);
1154                         return (ARCHIVE_FAILED);
1155                 }
1156                 fi++;
1157
1158                 filters[fi].id = LZMA_VLI_UNKNOWN;
1159                 filters[fi].options = NULL;
1160                 r = lzma_raw_decoder(&(zip->lzstream), filters);
1161 #if LZMA_VERSION < 50010000
1162                 free(ff->options);
1163 #endif
1164                 if (r != LZMA_OK) {
1165                         set_error(a, r);
1166                         return (ARCHIVE_FAILED);
1167                 }
1168                 zip->lzstream_valid = 1;
1169                 zip->lzstream.total_in = 0;
1170                 zip->lzstream.total_out = 0;
1171                 break;
1172         }
1173 #else
1174                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1175                     "LZMA codec is unsupported");
1176                 return (ARCHIVE_FAILED);
1177 #endif
1178         case _7Z_BZ2:
1179 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
1180                 if (zip->bzstream_valid) {
1181                         BZ2_bzDecompressEnd(&(zip->bzstream));
1182                         zip->bzstream_valid = 0;
1183                 }
1184                 r = BZ2_bzDecompressInit(&(zip->bzstream), 0, 0);
1185                 if (r == BZ_MEM_ERROR)
1186                         r = BZ2_bzDecompressInit(&(zip->bzstream), 0, 1);
1187                 if (r != BZ_OK) {
1188                         int err = ARCHIVE_ERRNO_MISC;
1189                         const char *detail = NULL;
1190                         switch (r) {
1191                         case BZ_PARAM_ERROR:
1192                                 detail = "invalid setup parameter";
1193                                 break;
1194                         case BZ_MEM_ERROR:
1195                                 err = ENOMEM;
1196                                 detail = "out of memory";
1197                                 break;
1198                         case BZ_CONFIG_ERROR:
1199                                 detail = "mis-compiled library";
1200                                 break;
1201                         }
1202                         archive_set_error(&a->archive, err,
1203                             "Internal error initializing decompressor: %s",
1204                             detail != NULL ? detail : "??");
1205                         zip->bzstream_valid = 0;
1206                         return (ARCHIVE_FAILED);
1207                 }
1208                 zip->bzstream_valid = 1;
1209                 zip->bzstream.total_in_lo32 = 0;
1210                 zip->bzstream.total_in_hi32 = 0;
1211                 zip->bzstream.total_out_lo32 = 0;
1212                 zip->bzstream.total_out_hi32 = 0;
1213                 break;
1214 #else
1215                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1216                     "BZ2 codec is unsupported");
1217                 return (ARCHIVE_FAILED);
1218 #endif
1219         case _7Z_DEFLATE:
1220 #ifdef HAVE_ZLIB_H
1221                 if (zip->stream_valid)
1222                         r = inflateReset(&(zip->stream));
1223                 else
1224                         r = inflateInit2(&(zip->stream),
1225                             -15 /* Don't check for zlib header */);
1226                 if (r != Z_OK) {
1227                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1228                             "Couldn't initialize zlib stream.");
1229                         return (ARCHIVE_FAILED);
1230                 }
1231                 zip->stream_valid = 1;
1232                 zip->stream.total_in = 0;
1233                 zip->stream.total_out = 0;
1234                 break;
1235 #else
1236                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1237                     "DEFLATE codec is unsupported");
1238                 return (ARCHIVE_FAILED);
1239 #endif
1240         case _7Z_PPMD:
1241         {
1242                 unsigned order;
1243                 uint32_t msize;
1244
1245                 if (zip->ppmd7_valid) {
1246                         __archive_ppmd7_functions.Ppmd7_Free(
1247                             &zip->ppmd7_context, &g_szalloc);
1248                         zip->ppmd7_valid = 0;
1249                 }
1250
1251                 if (coder1->propertiesSize < 5) {
1252                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1253                             "Malformed PPMd parameter");
1254                         return (ARCHIVE_FAILED);
1255                 }
1256                 order = coder1->properties[0];
1257                 msize = archive_le32dec(&(coder1->properties[1]));
1258                 if (order < PPMD7_MIN_ORDER || order > PPMD7_MAX_ORDER ||
1259                     msize < PPMD7_MIN_MEM_SIZE || msize > PPMD7_MAX_MEM_SIZE) {
1260                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1261                             "Malformed PPMd parameter");
1262                         return (ARCHIVE_FAILED);
1263                 }
1264                 __archive_ppmd7_functions.Ppmd7_Construct(&zip->ppmd7_context);
1265                 r = __archive_ppmd7_functions.Ppmd7_Alloc(
1266                         &zip->ppmd7_context, msize, &g_szalloc);
1267                 if (r == 0) {
1268                         archive_set_error(&a->archive, ENOMEM,
1269                             "Coludn't allocate memory for PPMd");
1270                         return (ARCHIVE_FATAL);
1271                 }
1272                 __archive_ppmd7_functions.Ppmd7_Init(
1273                         &zip->ppmd7_context, order);
1274                 __archive_ppmd7_functions.Ppmd7z_RangeDec_CreateVTable(
1275                         &zip->range_dec);
1276                 zip->ppmd7_valid = 1;
1277                 zip->ppmd7_stat = 0;
1278                 zip->ppstream.overconsumed = 0;
1279                 zip->ppstream.total_in = 0;
1280                 zip->ppstream.total_out = 0;
1281                 break;
1282         }
1283         case _7Z_X86:
1284         case _7Z_X86_BCJ2:
1285         case _7Z_POWERPC:
1286         case _7Z_IA64:
1287         case _7Z_ARM:
1288         case _7Z_ARMTHUMB:
1289         case _7Z_SPARC:
1290         case _7Z_DELTA:
1291                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1292                     "Unexpected codec ID: %lX", zip->codec);
1293                 return (ARCHIVE_FAILED);
1294         case _7Z_CRYPTO_MAIN_ZIP:
1295         case _7Z_CRYPTO_RAR_29:
1296         case _7Z_CRYPTO_AES_256_SHA_256:
1297                 if (a->entry) {
1298                         archive_entry_set_is_metadata_encrypted(a->entry, 1);
1299                         archive_entry_set_is_data_encrypted(a->entry, 1);
1300                         zip->has_encrypted_entries = 1;
1301                 }
1302                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1303                     "Crypto codec not supported yet (ID: 0x%lX)", zip->codec);
1304                 return (ARCHIVE_FAILED);
1305         default:
1306                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1307                     "Unknown codec ID: %lX", zip->codec);
1308                 return (ARCHIVE_FAILED);
1309         }
1310
1311         return (ARCHIVE_OK);
1312 }
1313
1314 static int
1315 decompress(struct archive_read *a, struct _7zip *zip,
1316     void *buff, size_t *outbytes, const void *b, size_t *used)
1317 {
1318         const uint8_t *t_next_in;
1319         uint8_t *t_next_out;
1320         size_t o_avail_in, o_avail_out;
1321         size_t t_avail_in, t_avail_out;
1322         uint8_t *bcj2_next_out;
1323         size_t bcj2_avail_out;
1324         int r, ret = ARCHIVE_OK;
1325
1326         t_avail_in = o_avail_in = *used;
1327         t_avail_out = o_avail_out = *outbytes;
1328         t_next_in = b;
1329         t_next_out = buff;
1330
1331         if (zip->codec != _7Z_LZMA2 && zip->codec2 == _7Z_X86) {
1332                 int i;
1333
1334                 /* Do not copy out the BCJ remaining bytes when the output
1335                  * buffer size is less than five bytes. */
1336                 if (o_avail_in != 0 && t_avail_out < 5 && zip->odd_bcj_size) {
1337                         *used = 0;
1338                         *outbytes = 0;
1339                         return (ret);
1340                 }
1341                 for (i = 0; zip->odd_bcj_size > 0 && t_avail_out; i++) {
1342                         *t_next_out++ = zip->odd_bcj[i];
1343                         t_avail_out--;
1344                         zip->odd_bcj_size--;
1345                 }
1346                 if (o_avail_in == 0 || t_avail_out == 0) {
1347                         *used = o_avail_in - t_avail_in;
1348                         *outbytes = o_avail_out - t_avail_out;
1349                         if (o_avail_in == 0)
1350                                 ret = ARCHIVE_EOF;
1351                         return (ret);
1352                 }
1353         }
1354
1355         bcj2_next_out = t_next_out;
1356         bcj2_avail_out = t_avail_out;
1357         if (zip->codec2 == _7Z_X86_BCJ2) {
1358                 /*
1359                  * Decord a remaining decompressed main stream for BCJ2.
1360                  */
1361                 if (zip->tmp_stream_bytes_remaining) {
1362                         ssize_t bytes;
1363                         size_t remaining = zip->tmp_stream_bytes_remaining;
1364                         bytes = Bcj2_Decode(zip, t_next_out, t_avail_out);
1365                         if (bytes < 0) {
1366                                 archive_set_error(&(a->archive),
1367                                     ARCHIVE_ERRNO_MISC,
1368                                     "BCJ2 conversion Failed");
1369                                 return (ARCHIVE_FAILED);
1370                         }
1371                         zip->main_stream_bytes_remaining -=
1372                             remaining - zip->tmp_stream_bytes_remaining;
1373                         t_avail_out -= bytes;
1374                         if (o_avail_in == 0 || t_avail_out == 0) {
1375                                 *used = 0;
1376                                 *outbytes = o_avail_out - t_avail_out;
1377                                 if (o_avail_in == 0 &&
1378                                     zip->tmp_stream_bytes_remaining)
1379                                         ret = ARCHIVE_EOF;
1380                                 return (ret);
1381                         }
1382                         t_next_out += bytes;
1383                         bcj2_next_out = t_next_out;
1384                         bcj2_avail_out = t_avail_out;
1385                 }
1386                 t_next_out = zip->tmp_stream_buff;
1387                 t_avail_out = zip->tmp_stream_buff_size;
1388         }
1389
1390         switch (zip->codec) {
1391         case _7Z_COPY:
1392         {
1393                 size_t bytes =
1394                     (t_avail_in > t_avail_out)?t_avail_out:t_avail_in;
1395
1396                 memcpy(t_next_out, t_next_in, bytes);
1397                 t_avail_in -= bytes;
1398                 t_avail_out -= bytes;
1399                 if (o_avail_in == 0)
1400                         ret = ARCHIVE_EOF;
1401                 break;
1402         }
1403 #ifdef HAVE_LZMA_H
1404         case _7Z_LZMA: case _7Z_LZMA2:
1405                 zip->lzstream.next_in = t_next_in;
1406                 zip->lzstream.avail_in = t_avail_in;
1407                 zip->lzstream.next_out = t_next_out;
1408                 zip->lzstream.avail_out = t_avail_out;
1409
1410                 r = lzma_code(&(zip->lzstream), LZMA_RUN);
1411                 switch (r) {
1412                 case LZMA_STREAM_END: /* Found end of stream. */
1413                         lzma_end(&(zip->lzstream));
1414                         zip->lzstream_valid = 0;
1415                         ret = ARCHIVE_EOF;
1416                         break;
1417                 case LZMA_OK: /* Decompressor made some progress. */
1418                         break;
1419                 default:
1420                         archive_set_error(&(a->archive),
1421                             ARCHIVE_ERRNO_MISC,
1422                                 "Decompression failed(%d)",
1423                             r);
1424                         return (ARCHIVE_FAILED);
1425                 }
1426                 t_avail_in = zip->lzstream.avail_in;
1427                 t_avail_out = zip->lzstream.avail_out;
1428                 break;
1429 #endif
1430 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
1431         case _7Z_BZ2:
1432                 zip->bzstream.next_in = (char *)(uintptr_t)t_next_in;
1433                 zip->bzstream.avail_in = t_avail_in;
1434                 zip->bzstream.next_out = (char *)(uintptr_t)t_next_out;
1435                 zip->bzstream.avail_out = t_avail_out;
1436                 r = BZ2_bzDecompress(&(zip->bzstream));
1437                 switch (r) {
1438                 case BZ_STREAM_END: /* Found end of stream. */
1439                         switch (BZ2_bzDecompressEnd(&(zip->bzstream))) {
1440                         case BZ_OK:
1441                                 break;
1442                         default:
1443                                 archive_set_error(&(a->archive),
1444                                     ARCHIVE_ERRNO_MISC,
1445                                     "Failed to clean up decompressor");
1446                                 return (ARCHIVE_FAILED);
1447                         }
1448                         zip->bzstream_valid = 0;
1449                         ret = ARCHIVE_EOF;
1450                         break;
1451                 case BZ_OK: /* Decompressor made some progress. */
1452                         break;
1453                 default:
1454                         archive_set_error(&(a->archive),
1455                             ARCHIVE_ERRNO_MISC,
1456                             "bzip decompression failed");
1457                         return (ARCHIVE_FAILED);
1458                 }
1459                 t_avail_in = zip->bzstream.avail_in;
1460                 t_avail_out = zip->bzstream.avail_out;
1461                 break;
1462 #endif
1463 #ifdef HAVE_ZLIB_H
1464         case _7Z_DEFLATE:
1465                 zip->stream.next_in = (Bytef *)(uintptr_t)t_next_in;
1466                 zip->stream.avail_in = (uInt)t_avail_in;
1467                 zip->stream.next_out = t_next_out;
1468                 zip->stream.avail_out = (uInt)t_avail_out;
1469                 r = inflate(&(zip->stream), 0);
1470                 switch (r) {
1471                 case Z_STREAM_END: /* Found end of stream. */
1472                         ret = ARCHIVE_EOF;
1473                         break;
1474                 case Z_OK: /* Decompressor made some progress.*/
1475                         break;
1476                 default:
1477                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1478                             "File decompression failed (%d)", r);
1479                         return (ARCHIVE_FAILED);
1480                 }
1481                 t_avail_in = zip->stream.avail_in;
1482                 t_avail_out = zip->stream.avail_out;
1483                 break;
1484 #endif
1485         case _7Z_PPMD:
1486         {
1487                 uint64_t flush_bytes;
1488
1489                 if (!zip->ppmd7_valid || zip->ppmd7_stat < 0 ||
1490                     t_avail_out <= 0) {
1491                         archive_set_error(&(a->archive),
1492                             ARCHIVE_ERRNO_MISC,
1493                             "Decompression internal error");
1494                         return (ARCHIVE_FAILED);
1495                 }
1496                 zip->ppstream.next_in = t_next_in;
1497                 zip->ppstream.avail_in = t_avail_in;
1498                 zip->ppstream.next_out = t_next_out;
1499                 zip->ppstream.avail_out = t_avail_out;
1500                 if (zip->ppmd7_stat == 0) {
1501                         zip->bytein.a = a;
1502                         zip->bytein.Read = &ppmd_read;
1503                         zip->range_dec.Stream = &zip->bytein;
1504                         r = __archive_ppmd7_functions.Ppmd7z_RangeDec_Init(
1505                                 &(zip->range_dec));
1506                         if (r == 0) {
1507                                 zip->ppmd7_stat = -1;
1508                                 archive_set_error(&a->archive,
1509                                     ARCHIVE_ERRNO_MISC,
1510                                     "Failed to initialize PPMd range decorder");
1511                                 return (ARCHIVE_FAILED);
1512                         }
1513                         if (zip->ppstream.overconsumed) {
1514                                 zip->ppmd7_stat = -1;
1515                                 return (ARCHIVE_FAILED);
1516                         }
1517                         zip->ppmd7_stat = 1;
1518                 }
1519
1520                 if (t_avail_in == 0)
1521                         /* XXX Flush out remaining decoded data XXX */
1522                         flush_bytes = zip->folder_outbytes_remaining;
1523                 else
1524                         flush_bytes = 0;
1525
1526                 do {
1527                         int sym;
1528
1529                         sym = __archive_ppmd7_functions.Ppmd7_DecodeSymbol(
1530                                 &(zip->ppmd7_context), &(zip->range_dec.p));
1531                         if (sym < 0) {
1532                                 zip->ppmd7_stat = -1;
1533                                 archive_set_error(&a->archive,
1534                                     ARCHIVE_ERRNO_FILE_FORMAT,
1535                                     "Failed to decode PPMd");
1536                                 return (ARCHIVE_FAILED);
1537                         }
1538                         if (zip->ppstream.overconsumed) {
1539                                 zip->ppmd7_stat = -1;
1540                                 return (ARCHIVE_FAILED);
1541                         }
1542                         *zip->ppstream.next_out++ = (unsigned char)sym;
1543                         zip->ppstream.avail_out--;
1544                         zip->ppstream.total_out++;
1545                         if (flush_bytes)
1546                                 flush_bytes--;
1547                 } while (zip->ppstream.avail_out &&
1548                         (zip->ppstream.avail_in || flush_bytes));
1549
1550                 t_avail_in = (size_t)zip->ppstream.avail_in;
1551                 t_avail_out = (size_t)zip->ppstream.avail_out;
1552                 break;
1553         }
1554         default:
1555                 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC,
1556                     "Decompression internal error");
1557                 return (ARCHIVE_FAILED);
1558         }
1559         if (ret != ARCHIVE_OK && ret != ARCHIVE_EOF)
1560                 return (ret);
1561
1562         *used = o_avail_in - t_avail_in;
1563         *outbytes = o_avail_out - t_avail_out;
1564
1565         /*
1566          * Decord BCJ.
1567          */
1568         if (zip->codec != _7Z_LZMA2 && zip->codec2 == _7Z_X86) {
1569                 size_t l = x86_Convert(zip, buff, *outbytes);
1570                 zip->odd_bcj_size = *outbytes - l;
1571                 if (zip->odd_bcj_size > 0 && zip->odd_bcj_size <= 4 &&
1572                     o_avail_in && ret != ARCHIVE_EOF) {
1573                         memcpy(zip->odd_bcj, ((unsigned char *)buff) + l,
1574                             zip->odd_bcj_size);
1575                         *outbytes = l;
1576                 } else
1577                         zip->odd_bcj_size = 0;
1578         }
1579
1580         /*
1581          * Decord BCJ2 with a decompressed main stream.
1582          */
1583         if (zip->codec2 == _7Z_X86_BCJ2) {
1584                 ssize_t bytes;
1585
1586                 zip->tmp_stream_bytes_avail =
1587                     zip->tmp_stream_buff_size - t_avail_out;
1588                 if (zip->tmp_stream_bytes_avail >
1589                       zip->main_stream_bytes_remaining)
1590                         zip->tmp_stream_bytes_avail =
1591                             zip->main_stream_bytes_remaining;
1592                 zip->tmp_stream_bytes_remaining = zip->tmp_stream_bytes_avail;
1593                 bytes = Bcj2_Decode(zip, bcj2_next_out, bcj2_avail_out);
1594                 if (bytes < 0) {
1595                         archive_set_error(&(a->archive),
1596                             ARCHIVE_ERRNO_MISC, "BCJ2 conversion Failed");
1597                         return (ARCHIVE_FAILED);
1598                 }
1599                 zip->main_stream_bytes_remaining -=
1600                     zip->tmp_stream_bytes_avail
1601                       - zip->tmp_stream_bytes_remaining;
1602                 bcj2_avail_out -= bytes;
1603                 *outbytes = o_avail_out - bcj2_avail_out;
1604         }
1605
1606         return (ret);
1607 }
1608
1609 static int
1610 free_decompression(struct archive_read *a, struct _7zip *zip)
1611 {
1612         int r = ARCHIVE_OK;
1613
1614 #if !defined(HAVE_ZLIB_H) &&\
1615         !(defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR))
1616         (void)a;/* UNUSED */
1617 #endif
1618 #ifdef HAVE_LZMA_H
1619         if (zip->lzstream_valid)
1620                 lzma_end(&(zip->lzstream));
1621 #endif
1622 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
1623         if (zip->bzstream_valid) {
1624                 if (BZ2_bzDecompressEnd(&(zip->bzstream)) != BZ_OK) {
1625                         archive_set_error(&a->archive,
1626                             ARCHIVE_ERRNO_MISC,
1627                             "Failed to clean up bzip2 decompressor");
1628                         r = ARCHIVE_FATAL;
1629                 }
1630                 zip->bzstream_valid = 0;
1631         }
1632 #endif
1633 #ifdef HAVE_ZLIB_H
1634         if (zip->stream_valid) {
1635                 if (inflateEnd(&(zip->stream)) != Z_OK) {
1636                         archive_set_error(&a->archive,
1637                             ARCHIVE_ERRNO_MISC,
1638                             "Failed to clean up zlib decompressor");
1639                         r = ARCHIVE_FATAL;
1640                 }
1641                 zip->stream_valid = 0;
1642         }
1643 #endif
1644         if (zip->ppmd7_valid) {
1645                 __archive_ppmd7_functions.Ppmd7_Free(
1646                         &zip->ppmd7_context, &g_szalloc);
1647                 zip->ppmd7_valid = 0;
1648         }
1649         return (r);
1650 }
1651
1652 static int
1653 parse_7zip_uint64(struct archive_read *a, uint64_t *val)
1654 {
1655         const unsigned char *p;
1656         unsigned char avail, mask;
1657         int i;
1658
1659         if ((p = header_bytes(a, 1)) == NULL)
1660                 return (-1);
1661         avail = *p;
1662         mask = 0x80;
1663         *val = 0;
1664         for (i = 0; i < 8; i++) {
1665                 if (avail & mask) {
1666                         if ((p = header_bytes(a, 1)) == NULL)
1667                                 return (-1);
1668                         *val |= ((uint64_t)*p) << (8 * i);
1669                         mask >>= 1;
1670                         continue;
1671                 }
1672                 *val += ((uint64_t)(avail & (mask -1))) << (8 * i);
1673                 break;
1674         }
1675         return (0);
1676 }
1677
1678 static int
1679 read_Bools(struct archive_read *a, unsigned char *data, size_t num)
1680 {
1681         const unsigned char *p;
1682         unsigned i, mask = 0, avail = 0;
1683
1684         for (i = 0; i < num; i++) {
1685                 if (mask == 0) {
1686                         if ((p = header_bytes(a, 1)) == NULL)
1687                                 return (-1);
1688                         avail = *p;
1689                         mask = 0x80;
1690                 }
1691                 data[i] = (avail & mask)?1:0;
1692                 mask >>= 1;
1693         }
1694         return (0);
1695 }
1696
1697 static void
1698 free_Digest(struct _7z_digests *d)
1699 {
1700         free(d->defineds);
1701         free(d->digests);
1702 }
1703
1704 static int
1705 read_Digests(struct archive_read *a, struct _7z_digests *d, size_t num)
1706 {
1707         const unsigned char *p;
1708         unsigned i;
1709
1710         if (num == 0)
1711                 return (-1);
1712         memset(d, 0, sizeof(*d));
1713
1714         d->defineds = malloc(num);
1715         if (d->defineds == NULL)
1716                 return (-1);
1717         /*
1718          * Read Bools.
1719          */
1720         if ((p = header_bytes(a, 1)) == NULL)
1721                 return (-1);
1722         if (*p == 0) {
1723                 if (read_Bools(a, d->defineds, num) < 0)
1724                         return (-1);
1725         } else
1726                 /* All are defined */
1727                 memset(d->defineds, 1, num);
1728
1729         d->digests = calloc(num, sizeof(*d->digests));
1730         if (d->digests == NULL)
1731                 return (-1);
1732         for (i = 0; i < num; i++) {
1733                 if (d->defineds[i]) {
1734                         if ((p = header_bytes(a, 4)) == NULL)
1735                                 return (-1);
1736                         d->digests[i] = archive_le32dec(p);
1737                 }
1738         }
1739
1740         return (0);
1741 }
1742
1743 static void
1744 free_PackInfo(struct _7z_pack_info *pi)
1745 {
1746         free(pi->sizes);
1747         free(pi->positions);
1748         free_Digest(&(pi->digest));
1749 }
1750
1751 static int
1752 read_PackInfo(struct archive_read *a, struct _7z_pack_info *pi)
1753 {
1754         const unsigned char *p;
1755         unsigned i;
1756
1757         memset(pi, 0, sizeof(*pi));
1758
1759         /*
1760          * Read PackPos.
1761          */
1762         if (parse_7zip_uint64(a, &(pi->pos)) < 0)
1763                 return (-1);
1764
1765         /*
1766          * Read NumPackStreams.
1767          */
1768         if (parse_7zip_uint64(a, &(pi->numPackStreams)) < 0)
1769                 return (-1);
1770         if (pi->numPackStreams == 0)
1771                 return (-1);
1772         if (UMAX_ENTRY < pi->numPackStreams)
1773                 return (-1);
1774
1775         /*
1776          * Read PackSizes[num]
1777          */
1778         if ((p = header_bytes(a, 1)) == NULL)
1779                 return (-1);
1780         if (*p == kEnd)
1781                 /* PackSizes[num] are not present. */
1782                 return (0);
1783         if (*p != kSize)
1784                 return (-1);
1785         pi->sizes = calloc((size_t)pi->numPackStreams, sizeof(uint64_t));
1786         pi->positions = calloc((size_t)pi->numPackStreams, sizeof(uint64_t));
1787         if (pi->sizes == NULL || pi->positions == NULL)
1788                 return (-1);
1789
1790         for (i = 0; i < pi->numPackStreams; i++) {
1791                 if (parse_7zip_uint64(a, &(pi->sizes[i])) < 0)
1792                         return (-1);
1793         }
1794
1795         /*
1796          * Read PackStreamDigests[num]
1797          */
1798         if ((p = header_bytes(a, 1)) == NULL)
1799                 return (-1);
1800         if (*p == kEnd) {
1801                 /* PackStreamDigests[num] are not present. */
1802                 pi->digest.defineds =
1803                     calloc((size_t)pi->numPackStreams, sizeof(*pi->digest.defineds));
1804                 pi->digest.digests =
1805                     calloc((size_t)pi->numPackStreams, sizeof(*pi->digest.digests));
1806                 if (pi->digest.defineds == NULL || pi->digest.digests == NULL)
1807                         return (-1);
1808                 return (0);
1809         }
1810
1811         if (*p != kSize)
1812                 return (-1);
1813
1814         if (read_Digests(a, &(pi->digest), (size_t)pi->numPackStreams) < 0)
1815                 return (-1);
1816
1817         /*
1818          *  Must be marked by kEnd.
1819          */
1820         if ((p = header_bytes(a, 1)) == NULL)
1821                 return (-1);
1822         if (*p != kEnd)
1823                 return (-1);
1824         return (0);
1825 }
1826
1827 static void
1828 free_Folder(struct _7z_folder *f)
1829 {
1830         unsigned i;
1831
1832         if (f->coders) {
1833                 for (i = 0; i< f->numCoders; i++) {
1834                         free(f->coders[i].properties);
1835                 }
1836                 free(f->coders);
1837         }
1838         free(f->bindPairs);
1839         free(f->packedStreams);
1840         free(f->unPackSize);
1841 }
1842
1843 static int
1844 read_Folder(struct archive_read *a, struct _7z_folder *f)
1845 {
1846         struct _7zip *zip = (struct _7zip *)a->format->data;
1847         const unsigned char *p;
1848         uint64_t numInStreamsTotal = 0;
1849         uint64_t numOutStreamsTotal = 0;
1850         unsigned i;
1851
1852         memset(f, 0, sizeof(*f));
1853
1854         /*
1855          * Read NumCoders.
1856          */
1857         if (parse_7zip_uint64(a, &(f->numCoders)) < 0)
1858                 return (-1);
1859         if (f->numCoders > 4)
1860                 /* Too many coders. */
1861                 return (-1);
1862
1863         f->coders = calloc((size_t)f->numCoders, sizeof(*f->coders));
1864         if (f->coders == NULL)
1865                 return (-1);
1866         for (i = 0; i< f->numCoders; i++) {
1867                 size_t codec_size;
1868                 int simple, attr;
1869
1870                 if ((p = header_bytes(a, 1)) == NULL)
1871                         return (-1);
1872                 /*
1873                  * 0:3 CodecIdSize
1874                  * 4:  0 - IsSimple
1875                  *     1 - Is not Simple
1876                  * 5:  0 - No Attributes
1877                  *     1 - There are Attributes;
1878                  * 7:  Must be zero.
1879                  */
1880                 codec_size = *p & 0xf;
1881                 simple = (*p & 0x10)?0:1;
1882                 attr = *p & 0x20;
1883                 if (*p & 0x80)
1884                         return (-1);/* Not supported. */
1885
1886                 /*
1887                  * Read Decompression Method IDs.
1888                  */
1889                 if ((p = header_bytes(a, codec_size)) == NULL)
1890                         return (-1);
1891
1892                 f->coders[i].codec = decode_codec_id(p, codec_size);
1893
1894                 if (simple) {
1895                         f->coders[i].numInStreams = 1;
1896                         f->coders[i].numOutStreams = 1;
1897                 } else {
1898                         if (parse_7zip_uint64(
1899                             a, &(f->coders[i].numInStreams)) < 0)
1900                                 return (-1);
1901                         if (UMAX_ENTRY < f->coders[i].numInStreams)
1902                                 return (-1);
1903                         if (parse_7zip_uint64(
1904                             a, &(f->coders[i].numOutStreams)) < 0)
1905                                 return (-1);
1906                         if (UMAX_ENTRY < f->coders[i].numOutStreams)
1907                                 return (-1);
1908                 }
1909
1910                 if (attr) {
1911                         if (parse_7zip_uint64(
1912                             a, &(f->coders[i].propertiesSize)) < 0)
1913                                 return (-1);
1914                         if ((p = header_bytes(
1915                             a, (size_t)f->coders[i].propertiesSize)) == NULL)
1916                                 return (-1);
1917                         f->coders[i].properties =
1918                             malloc((size_t)f->coders[i].propertiesSize);
1919                         if (f->coders[i].properties == NULL)
1920                                 return (-1);
1921                         memcpy(f->coders[i].properties, p,
1922                             (size_t)f->coders[i].propertiesSize);
1923                 }
1924
1925                 numInStreamsTotal += f->coders[i].numInStreams;
1926                 numOutStreamsTotal += f->coders[i].numOutStreams;
1927         }
1928
1929         if (numOutStreamsTotal == 0 ||
1930             numInStreamsTotal < numOutStreamsTotal-1)
1931                 return (-1);
1932
1933         f->numBindPairs = numOutStreamsTotal - 1;
1934         if (zip->header_bytes_remaining < f->numBindPairs)
1935                         return (-1);
1936         if (f->numBindPairs > 0) {
1937                 f->bindPairs =
1938                         calloc((size_t)f->numBindPairs, sizeof(*f->bindPairs));
1939                 if (f->bindPairs == NULL)
1940                         return (-1);
1941         } else
1942                 f->bindPairs = NULL;
1943         for (i = 0; i < f->numBindPairs; i++) {
1944                 if (parse_7zip_uint64(a, &(f->bindPairs[i].inIndex)) < 0)
1945                         return (-1);
1946                 if (UMAX_ENTRY < f->bindPairs[i].inIndex)
1947                         return (-1);
1948                 if (parse_7zip_uint64(a, &(f->bindPairs[i].outIndex)) < 0)
1949                         return (-1);
1950                 if (UMAX_ENTRY < f->bindPairs[i].outIndex)
1951                         return (-1);
1952         }
1953
1954         f->numPackedStreams = numInStreamsTotal - f->numBindPairs;
1955         f->packedStreams =
1956             calloc((size_t)f->numPackedStreams, sizeof(*f->packedStreams));
1957         if (f->packedStreams == NULL)
1958                 return (-1);
1959         if (f->numPackedStreams == 1) {
1960                 for (i = 0; i < numInStreamsTotal; i++) {
1961                         unsigned j;
1962                         for (j = 0; j < f->numBindPairs; j++) {
1963                                 if (f->bindPairs[j].inIndex == i)
1964                                         break;
1965                         }
1966                         if (j == f->numBindPairs)
1967                                 break;
1968                 }
1969                 if (i == numInStreamsTotal)
1970                         return (-1);
1971                 f->packedStreams[0] = i;
1972         } else {
1973                 for (i = 0; i < f->numPackedStreams; i++) {
1974                         if (parse_7zip_uint64(a, &(f->packedStreams[i])) < 0)
1975                                 return (-1);
1976                         if (UMAX_ENTRY < f->packedStreams[i])
1977                                 return (-1);
1978                 }
1979         }
1980         f->numInStreams = numInStreamsTotal;
1981         f->numOutStreams = numOutStreamsTotal;
1982
1983         return (0);
1984 }
1985
1986 static void
1987 free_CodersInfo(struct _7z_coders_info *ci)
1988 {
1989         unsigned i;
1990
1991         if (ci->folders) {
1992                 for (i = 0; i < ci->numFolders; i++)
1993                         free_Folder(&(ci->folders[i]));
1994                 free(ci->folders);
1995         }
1996 }
1997
1998 static int
1999 read_CodersInfo(struct archive_read *a, struct _7z_coders_info *ci)
2000 {
2001         const unsigned char *p;
2002         struct _7z_digests digest;
2003         unsigned i;
2004
2005         memset(ci, 0, sizeof(*ci));
2006         memset(&digest, 0, sizeof(digest));
2007
2008         if ((p = header_bytes(a, 1)) == NULL)
2009                 goto failed;
2010         if (*p != kFolder)
2011                 goto failed;
2012
2013         /*
2014          * Read NumFolders.
2015          */
2016         if (parse_7zip_uint64(a, &(ci->numFolders)) < 0)
2017                 goto failed;
2018         if (UMAX_ENTRY < ci->numFolders)
2019                 return (-1);
2020
2021         /*
2022          * Read External.
2023          */
2024         if ((p = header_bytes(a, 1)) == NULL)
2025                 goto failed;
2026         switch (*p) {
2027         case 0:
2028                 ci->folders =
2029                         calloc((size_t)ci->numFolders, sizeof(*ci->folders));
2030                 if (ci->folders == NULL)
2031                         return (-1);
2032                 for (i = 0; i < ci->numFolders; i++) {
2033                         if (read_Folder(a, &(ci->folders[i])) < 0)
2034                                 goto failed;
2035                 }
2036                 break;
2037         case 1:
2038                 if (parse_7zip_uint64(a, &(ci->dataStreamIndex)) < 0)
2039                         return (-1);
2040                 if (UMAX_ENTRY < ci->dataStreamIndex)
2041                         return (-1);
2042                 if (ci->numFolders > 0) {
2043                         archive_set_error(&a->archive, -1,
2044                             "Malformed 7-Zip archive");
2045                         goto failed;
2046                 }
2047                 break;
2048         default:
2049                 archive_set_error(&a->archive, -1,
2050                     "Malformed 7-Zip archive");
2051                 goto failed;
2052         }
2053
2054         if ((p = header_bytes(a, 1)) == NULL)
2055                 goto failed;
2056         if (*p != kCodersUnPackSize)
2057                 goto failed;
2058
2059         for (i = 0; i < ci->numFolders; i++) {
2060                 struct _7z_folder *folder = &(ci->folders[i]);
2061                 unsigned j;
2062
2063                 folder->unPackSize =
2064                     calloc((size_t)folder->numOutStreams, sizeof(*folder->unPackSize));
2065                 if (folder->unPackSize == NULL)
2066                         goto failed;
2067                 for (j = 0; j < folder->numOutStreams; j++) {
2068                         if (parse_7zip_uint64(a, &(folder->unPackSize[j])) < 0)
2069                                 goto failed;
2070                 }
2071         }
2072
2073         /*
2074          * Read CRCs.
2075          */
2076         if ((p = header_bytes(a, 1)) == NULL)
2077                 goto failed;
2078         if (*p == kEnd)
2079                 return (0);
2080         if (*p != kCRC)
2081                 goto failed;
2082         if (read_Digests(a, &digest, (size_t)ci->numFolders) < 0)
2083                 goto failed;
2084         for (i = 0; i < ci->numFolders; i++) {
2085                 ci->folders[i].digest_defined = digest.defineds[i];
2086                 ci->folders[i].digest = digest.digests[i];
2087         }
2088
2089         /*
2090          *  Must be kEnd.
2091          */
2092         if ((p = header_bytes(a, 1)) == NULL)
2093                 goto failed;
2094         if (*p != kEnd)
2095                 goto failed;
2096         free_Digest(&digest);
2097         return (0);
2098 failed:
2099         free_Digest(&digest);
2100         return (-1);
2101 }
2102
2103 static uint64_t
2104 folder_uncompressed_size(struct _7z_folder *f)
2105 {
2106         int n = (int)f->numOutStreams;
2107         unsigned pairs = (unsigned)f->numBindPairs;
2108
2109         while (--n >= 0) {
2110                 unsigned i;
2111                 for (i = 0; i < pairs; i++) {
2112                         if (f->bindPairs[i].outIndex == (uint64_t)n)
2113                                 break;
2114                 }
2115                 if (i >= pairs)
2116                         return (f->unPackSize[n]);
2117         }
2118         return (0);
2119 }
2120
2121 static void
2122 free_SubStreamsInfo(struct _7z_substream_info *ss)
2123 {
2124         free(ss->unpackSizes);
2125         free(ss->digestsDefined);
2126         free(ss->digests);
2127 }
2128
2129 static int
2130 read_SubStreamsInfo(struct archive_read *a, struct _7z_substream_info *ss,
2131     struct _7z_folder *f, size_t numFolders)
2132 {
2133         const unsigned char *p;
2134         uint64_t *usizes;
2135         size_t unpack_streams;
2136         int type;
2137         unsigned i;
2138         uint32_t numDigests;
2139
2140         memset(ss, 0, sizeof(*ss));
2141
2142         for (i = 0; i < numFolders; i++)
2143                 f[i].numUnpackStreams = 1;
2144
2145         if ((p = header_bytes(a, 1)) == NULL)
2146                 return (-1);
2147         type = *p;
2148
2149         if (type == kNumUnPackStream) {
2150                 unpack_streams = 0;
2151                 for (i = 0; i < numFolders; i++) {
2152                         if (parse_7zip_uint64(a, &(f[i].numUnpackStreams)) < 0)
2153                                 return (-1);
2154                         if (UMAX_ENTRY < f[i].numUnpackStreams)
2155                                 return (-1);
2156                         unpack_streams += (size_t)f[i].numUnpackStreams;
2157                 }
2158                 if ((p = header_bytes(a, 1)) == NULL)
2159                         return (-1);
2160                 type = *p;
2161         } else
2162                 unpack_streams = numFolders;
2163
2164         ss->unpack_streams = unpack_streams;
2165         if (unpack_streams) {
2166                 ss->unpackSizes = calloc(unpack_streams,
2167                     sizeof(*ss->unpackSizes));
2168                 ss->digestsDefined = calloc(unpack_streams,
2169                     sizeof(*ss->digestsDefined));
2170                 ss->digests = calloc(unpack_streams,
2171                     sizeof(*ss->digests));
2172                 if (ss->unpackSizes == NULL || ss->digestsDefined == NULL ||
2173                     ss->digests == NULL)
2174                         return (-1);
2175         }
2176
2177         usizes = ss->unpackSizes;
2178         for (i = 0; i < numFolders; i++) {
2179                 unsigned pack;
2180                 uint64_t sum;
2181
2182                 if (f[i].numUnpackStreams == 0)
2183                         continue;
2184
2185                 sum = 0;
2186                 if (type == kSize) {
2187                         for (pack = 1; pack < f[i].numUnpackStreams; pack++) {
2188                                 if (parse_7zip_uint64(a, usizes) < 0)
2189                                         return (-1);
2190                                 sum += *usizes++;
2191                         }
2192                 }
2193                 *usizes++ = folder_uncompressed_size(&f[i]) - sum;
2194         }
2195
2196         if (type == kSize) {
2197                 if ((p = header_bytes(a, 1)) == NULL)
2198                         return (-1);
2199                 type = *p;
2200         }
2201
2202         for (i = 0; i < unpack_streams; i++) {
2203                 ss->digestsDefined[i] = 0;
2204                 ss->digests[i] = 0;
2205         }
2206
2207         numDigests = 0;
2208         for (i = 0; i < numFolders; i++) {
2209                 if (f[i].numUnpackStreams != 1 || !f[i].digest_defined)
2210                         numDigests += (uint32_t)f[i].numUnpackStreams;
2211         }
2212
2213         if (type == kCRC) {
2214                 struct _7z_digests tmpDigests;
2215                 unsigned char *digestsDefined = ss->digestsDefined;
2216                 uint32_t * digests = ss->digests;
2217                 int di = 0;
2218
2219                 memset(&tmpDigests, 0, sizeof(tmpDigests));
2220                 if (read_Digests(a, &(tmpDigests), numDigests) < 0) {
2221                         free_Digest(&tmpDigests);
2222                         return (-1);
2223                 }
2224                 for (i = 0; i < numFolders; i++) {
2225                         if (f[i].numUnpackStreams == 1 && f[i].digest_defined) {
2226                                 *digestsDefined++ = 1;
2227                                 *digests++ = f[i].digest;
2228                         } else {
2229                                 unsigned j;
2230
2231                                 for (j = 0; j < f[i].numUnpackStreams;
2232                                     j++, di++) {
2233                                         *digestsDefined++ =
2234                                             tmpDigests.defineds[di];
2235                                         *digests++ =
2236                                             tmpDigests.digests[di];
2237                                 }
2238                         }
2239                 }
2240                 free_Digest(&tmpDigests);
2241                 if ((p = header_bytes(a, 1)) == NULL)
2242                         return (-1);
2243                 type = *p;
2244         }
2245
2246         /*
2247          *  Must be kEnd.
2248          */
2249         if (type != kEnd)
2250                 return (-1);
2251         return (0);
2252 }
2253
2254 static void
2255 free_StreamsInfo(struct _7z_stream_info *si)
2256 {
2257         free_PackInfo(&(si->pi));
2258         free_CodersInfo(&(si->ci));
2259         free_SubStreamsInfo(&(si->ss));
2260 }
2261
2262 static int
2263 read_StreamsInfo(struct archive_read *a, struct _7z_stream_info *si)
2264 {
2265         struct _7zip *zip = (struct _7zip *)a->format->data;
2266         const unsigned char *p;
2267         unsigned i;
2268
2269         memset(si, 0, sizeof(*si));
2270
2271         if ((p = header_bytes(a, 1)) == NULL)
2272                 return (-1);
2273         if (*p == kPackInfo) {
2274                 uint64_t packPos;
2275
2276                 if (read_PackInfo(a, &(si->pi)) < 0)
2277                         return (-1);
2278
2279                 if (si->pi.positions == NULL || si->pi.sizes == NULL)
2280                         return (-1);
2281                 /*
2282                  * Calculate packed stream positions.
2283                  */
2284                 packPos = si->pi.pos;
2285                 for (i = 0; i < si->pi.numPackStreams; i++) {
2286                         si->pi.positions[i] = packPos;
2287                         packPos += si->pi.sizes[i];
2288                         if (packPos > zip->header_offset)
2289                                 return (-1);
2290                 }
2291                 if ((p = header_bytes(a, 1)) == NULL)
2292                         return (-1);
2293         }
2294         if (*p == kUnPackInfo) {
2295                 uint32_t packIndex;
2296                 struct _7z_folder *f;
2297
2298                 if (read_CodersInfo(a, &(si->ci)) < 0)
2299                         return (-1);
2300
2301                 /*
2302                  * Calculate packed stream indexes.
2303                  */
2304                 packIndex = 0;
2305                 f = si->ci.folders;
2306                 for (i = 0; i < si->ci.numFolders; i++) {
2307                         f[i].packIndex = packIndex;
2308                         packIndex += (uint32_t)f[i].numPackedStreams;
2309                         if (packIndex > si->pi.numPackStreams)
2310                                 return (-1);
2311                 }
2312                 if ((p = header_bytes(a, 1)) == NULL)
2313                         return (-1);
2314         }
2315
2316         if (*p == kSubStreamsInfo) {
2317                 if (read_SubStreamsInfo(a, &(si->ss),
2318                     si->ci.folders, (size_t)si->ci.numFolders) < 0)
2319                         return (-1);
2320                 if ((p = header_bytes(a, 1)) == NULL)
2321                         return (-1);
2322         }
2323
2324         /*
2325          *  Must be kEnd.
2326          */
2327         if (*p != kEnd)
2328                 return (-1);
2329         return (0);
2330 }
2331
2332 static void
2333 free_Header(struct _7z_header_info *h)
2334 {
2335         free(h->emptyStreamBools);
2336         free(h->emptyFileBools);
2337         free(h->antiBools);
2338         free(h->attrBools);
2339 }
2340
2341 static int
2342 read_Header(struct archive_read *a, struct _7z_header_info *h,
2343     int check_header_id)
2344 {
2345         struct _7zip *zip = (struct _7zip *)a->format->data;
2346         const unsigned char *p;
2347         struct _7z_folder *folders;
2348         struct _7z_stream_info *si = &(zip->si);
2349         struct _7zip_entry *entries;
2350         uint32_t folderIndex, indexInFolder;
2351         unsigned i;
2352         int eindex, empty_streams, sindex;
2353
2354         if (check_header_id) {
2355                 /*
2356                  * Read Header.
2357                  */
2358                 if ((p = header_bytes(a, 1)) == NULL)
2359                         return (-1);
2360                 if (*p != kHeader)
2361                         return (-1);
2362         }
2363
2364         /*
2365          * Read ArchiveProperties.
2366          */
2367         if ((p = header_bytes(a, 1)) == NULL)
2368                 return (-1);
2369         if (*p == kArchiveProperties) {
2370                 for (;;) {
2371                         uint64_t size;
2372                         if ((p = header_bytes(a, 1)) == NULL)
2373                                 return (-1);
2374                         if (*p == 0)
2375                                 break;
2376                         if (parse_7zip_uint64(a, &size) < 0)
2377                                 return (-1);
2378                 }
2379                 if ((p = header_bytes(a, 1)) == NULL)
2380                         return (-1);
2381         }
2382
2383         /*
2384          * Read MainStreamsInfo.
2385          */
2386         if (*p == kMainStreamsInfo) {
2387                 if (read_StreamsInfo(a, &(zip->si)) < 0)
2388                         return (-1);
2389                 if ((p = header_bytes(a, 1)) == NULL)
2390                         return (-1);
2391         }
2392         if (*p == kEnd)
2393                 return (0);
2394
2395         /*
2396          * Read FilesInfo.
2397          */
2398         if (*p != kFilesInfo)
2399                 return (-1);
2400
2401         if (parse_7zip_uint64(a, &(zip->numFiles)) < 0)
2402                 return (-1);
2403         if (UMAX_ENTRY < zip->numFiles)
2404                 return (-1);
2405
2406         zip->entries = calloc((size_t)zip->numFiles, sizeof(*zip->entries));
2407         if (zip->entries == NULL)
2408                 return (-1);
2409         entries = zip->entries;
2410
2411         empty_streams = 0;
2412         for (;;) {
2413                 int type;
2414                 uint64_t size;
2415                 size_t ll;
2416
2417                 if ((p = header_bytes(a, 1)) == NULL)
2418                         return (-1);
2419                 type = *p;
2420                 if (type == kEnd)
2421                         break;
2422
2423                 if (parse_7zip_uint64(a, &size) < 0)
2424                         return (-1);
2425                 if (zip->header_bytes_remaining < size)
2426                         return (-1);
2427                 ll = (size_t)size;
2428
2429                 switch (type) {
2430                 case kEmptyStream:
2431                         h->emptyStreamBools = calloc((size_t)zip->numFiles,
2432                             sizeof(*h->emptyStreamBools));
2433                         if (h->emptyStreamBools == NULL)
2434                                 return (-1);
2435                         if (read_Bools(
2436                             a, h->emptyStreamBools, (size_t)zip->numFiles) < 0)
2437                                 return (-1);
2438                         empty_streams = 0;
2439                         for (i = 0; i < zip->numFiles; i++) {
2440                                 if (h->emptyStreamBools[i])
2441                                         empty_streams++;
2442                         }
2443                         break;
2444                 case kEmptyFile:
2445                         if (empty_streams <= 0) {
2446                                 /* Unexcepted sequence. Skip this. */
2447                                 if (header_bytes(a, ll) == NULL)
2448                                         return (-1);
2449                                 break;
2450                         }
2451                         h->emptyFileBools = calloc(empty_streams,
2452                             sizeof(*h->emptyFileBools));
2453                         if (h->emptyFileBools == NULL)
2454                                 return (-1);
2455                         if (read_Bools(a, h->emptyFileBools, empty_streams) < 0)
2456                                 return (-1);
2457                         break;
2458                 case kAnti:
2459                         if (empty_streams <= 0) {
2460                                 /* Unexcepted sequence. Skip this. */
2461                                 if (header_bytes(a, ll) == NULL)
2462                                         return (-1);
2463                                 break;
2464                         }
2465                         h->antiBools = calloc(empty_streams,
2466                             sizeof(*h->antiBools));
2467                         if (h->antiBools == NULL)
2468                                 return (-1);
2469                         if (read_Bools(a, h->antiBools, empty_streams) < 0)
2470                                 return (-1);
2471                         break;
2472                 case kCTime:
2473                 case kATime:
2474                 case kMTime:
2475                         if (read_Times(a, h, type) < 0)
2476                                 return (-1);
2477                         break;
2478                 case kName:
2479                 {
2480                         unsigned char *np;
2481                         size_t nl, nb;
2482
2483                         /* Skip one byte. */
2484                         if ((p = header_bytes(a, 1)) == NULL)
2485                                 return (-1);
2486                         ll--;
2487
2488                         if ((ll & 1) || ll < zip->numFiles * 4)
2489                                 return (-1);
2490
2491                         zip->entry_names = malloc(ll);
2492                         if (zip->entry_names == NULL)
2493                                 return (-1);
2494                         np = zip->entry_names;
2495                         nb = ll;
2496                         /*
2497                          * Copy whole file names.
2498                          * NOTE: This loop prevents from expanding
2499                          * the uncompressed buffer in order not to
2500                          * use extra memory resource.
2501                          */
2502                         while (nb) {
2503                                 size_t b;
2504                                 if (nb > UBUFF_SIZE)
2505                                         b = UBUFF_SIZE;
2506                                 else
2507                                         b = nb;
2508                                 if ((p = header_bytes(a, b)) == NULL)
2509                                         return (-1);
2510                                 memcpy(np, p, b);
2511                                 np += b;
2512                                 nb -= b;
2513                         }
2514                         np = zip->entry_names;
2515                         nl = ll;
2516
2517                         for (i = 0; i < zip->numFiles; i++) {
2518                                 entries[i].utf16name = np;
2519 #if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG)
2520                                 entries[i].wname = (wchar_t *)np;
2521 #endif
2522
2523                                 /* Find a terminator. */
2524                                 while (nl >= 2 && (np[0] || np[1])) {
2525                                         np += 2;
2526                                         nl -= 2;
2527                                 }
2528                                 if (nl < 2)
2529                                         return (-1);/* Terminator not found */
2530                                 entries[i].name_len = np - entries[i].utf16name;
2531                                 np += 2;
2532                                 nl -= 2;
2533                         }
2534                         break;
2535                 }
2536                 case kAttributes:
2537                 {
2538                         int allAreDefined;
2539
2540                         if ((p = header_bytes(a, 2)) == NULL)
2541                                 return (-1);
2542                         allAreDefined = *p;
2543                         h->attrBools = calloc((size_t)zip->numFiles,
2544                             sizeof(*h->attrBools));
2545                         if (h->attrBools == NULL)
2546                                 return (-1);
2547                         if (allAreDefined)
2548                                 memset(h->attrBools, 1, (size_t)zip->numFiles);
2549                         else {
2550                                 if (read_Bools(a, h->attrBools,
2551                                       (size_t)zip->numFiles) < 0)
2552                                         return (-1);
2553                         }
2554                         for (i = 0; i < zip->numFiles; i++) {
2555                                 if (h->attrBools[i]) {
2556                                         if ((p = header_bytes(a, 4)) == NULL)
2557                                                 return (-1);
2558                                         entries[i].attr = archive_le32dec(p);
2559                                 }
2560                         }
2561                         break;
2562                 }
2563                 case kDummy:
2564                         if (ll == 0)
2565                                 break;
2566                 default:
2567                         if (header_bytes(a, ll) == NULL)
2568                                 return (-1);
2569                         break;
2570                 }
2571         }
2572
2573         /*
2574          * Set up entry's attributes.
2575          */
2576         folders = si->ci.folders;
2577         eindex = sindex = 0;
2578         folderIndex = indexInFolder = 0;
2579         for (i = 0; i < zip->numFiles; i++) {
2580                 if (h->emptyStreamBools == NULL || h->emptyStreamBools[i] == 0)
2581                         entries[i].flg |= HAS_STREAM;
2582                 /* The high 16 bits of attributes is a posix file mode. */
2583                 entries[i].mode = entries[i].attr >> 16;
2584                 if (entries[i].flg & HAS_STREAM) {
2585                         if ((size_t)sindex >= si->ss.unpack_streams)
2586                                 return (-1);
2587                         if (entries[i].mode == 0)
2588                                 entries[i].mode = AE_IFREG | 0666;
2589                         if (si->ss.digestsDefined[sindex])
2590                                 entries[i].flg |= CRC32_IS_SET;
2591                         entries[i].ssIndex = sindex;
2592                         sindex++;
2593                 } else {
2594                         int dir;
2595                         if (h->emptyFileBools == NULL)
2596                                 dir = 1;
2597                         else {
2598                                 if (h->emptyFileBools[eindex])
2599                                         dir = 0;
2600                                 else
2601                                         dir = 1;
2602                                 eindex++;
2603                         }
2604                         if (entries[i].mode == 0) {
2605                                 if (dir)
2606                                         entries[i].mode = AE_IFDIR | 0777;
2607                                 else
2608                                         entries[i].mode = AE_IFREG | 0666;
2609                         } else if (dir &&
2610                             (entries[i].mode & AE_IFMT) != AE_IFDIR) {
2611                                 entries[i].mode &= ~AE_IFMT;
2612                                 entries[i].mode |= AE_IFDIR;
2613                         }
2614                         if ((entries[i].mode & AE_IFMT) == AE_IFDIR &&
2615                             entries[i].name_len >= 2 &&
2616                             (entries[i].utf16name[entries[i].name_len-2] != '/' ||
2617                              entries[i].utf16name[entries[i].name_len-1] != 0)) {
2618                                 entries[i].utf16name[entries[i].name_len] = '/';
2619                                 entries[i].utf16name[entries[i].name_len+1] = 0;
2620                                 entries[i].name_len += 2;
2621                         }
2622                         entries[i].ssIndex = -1;
2623                 }
2624                 if (entries[i].attr & 0x01)
2625                         entries[i].mode &= ~0222;/* Read only. */
2626
2627                 if ((entries[i].flg & HAS_STREAM) == 0 && indexInFolder == 0) {
2628                         /*
2629                          * The entry is an empty file or a directory file,
2630                          * those both have no contents.
2631                          */
2632                         entries[i].folderIndex = -1;
2633                         continue;
2634                 }
2635                 if (indexInFolder == 0) {
2636                         for (;;) {
2637                                 if (folderIndex >= si->ci.numFolders)
2638                                         return (-1);
2639                                 if (folders[folderIndex].numUnpackStreams)
2640                                         break;
2641                                 folderIndex++;
2642                         }
2643                 }
2644                 entries[i].folderIndex = folderIndex;
2645                 if ((entries[i].flg & HAS_STREAM) == 0)
2646                         continue;
2647                 indexInFolder++;
2648                 if (indexInFolder >= folders[folderIndex].numUnpackStreams) {
2649                         folderIndex++;
2650                         indexInFolder = 0;
2651                 }
2652         }
2653
2654         return (0);
2655 }
2656
2657 #define EPOC_TIME ARCHIVE_LITERAL_ULL(116444736000000000)
2658 static void
2659 fileTimeToUtc(uint64_t fileTime, time_t *timep, long *ns)
2660 {
2661
2662         if (fileTime >= EPOC_TIME) {
2663                 fileTime -= EPOC_TIME;
2664                 /* milli seconds base */
2665                 *timep = (time_t)(fileTime / 10000000);
2666                 /* nano seconds base */
2667                 *ns = (long)(fileTime % 10000000) * 100;
2668         } else {
2669                 *timep = 0;
2670                 *ns = 0;
2671         }
2672 }
2673
2674 static int
2675 read_Times(struct archive_read *a, struct _7z_header_info *h, int type)
2676 {
2677         struct _7zip *zip = (struct _7zip *)a->format->data;
2678         const unsigned char *p;
2679         struct _7zip_entry *entries = zip->entries;
2680         unsigned char *timeBools;
2681         int allAreDefined;
2682         unsigned i;
2683
2684         timeBools = calloc((size_t)zip->numFiles, sizeof(*timeBools));
2685         if (timeBools == NULL)
2686                 return (-1);
2687
2688         /* Read allAreDefined. */
2689         if ((p = header_bytes(a, 1)) == NULL)
2690                 goto failed;
2691         allAreDefined = *p;
2692         if (allAreDefined)
2693                 memset(timeBools, 1, (size_t)zip->numFiles);
2694         else {
2695                 if (read_Bools(a, timeBools, (size_t)zip->numFiles) < 0)
2696                         goto failed;
2697         }
2698
2699         /* Read external. */
2700         if ((p = header_bytes(a, 1)) == NULL)
2701                 goto failed;
2702         if (*p) {
2703                 if (parse_7zip_uint64(a, &(h->dataIndex)) < 0)
2704                         goto failed;
2705                 if (UMAX_ENTRY < h->dataIndex)
2706                         goto failed;
2707         }
2708
2709         for (i = 0; i < zip->numFiles; i++) {
2710                 if (!timeBools[i])
2711                         continue;
2712                 if ((p = header_bytes(a, 8)) == NULL)
2713                         goto failed;
2714                 switch (type) {
2715                 case kCTime:
2716                         fileTimeToUtc(archive_le64dec(p),
2717                             &(entries[i].ctime),
2718                             &(entries[i].ctime_ns));
2719                         entries[i].flg |= CTIME_IS_SET;
2720                         break;
2721                 case kATime:
2722                         fileTimeToUtc(archive_le64dec(p),
2723                             &(entries[i].atime),
2724                             &(entries[i].atime_ns));
2725                         entries[i].flg |= ATIME_IS_SET;
2726                         break;
2727                 case kMTime:
2728                         fileTimeToUtc(archive_le64dec(p),
2729                             &(entries[i].mtime),
2730                             &(entries[i].mtime_ns));
2731                         entries[i].flg |= MTIME_IS_SET;
2732                         break;
2733                 }
2734         }
2735
2736         free(timeBools);
2737         return (0);
2738 failed:
2739         free(timeBools);
2740         return (-1);
2741 }
2742
2743 static int
2744 decode_encoded_header_info(struct archive_read *a, struct _7z_stream_info *si)
2745 {
2746         struct _7zip *zip = (struct _7zip *)a->format->data;
2747
2748         errno = 0;
2749         if (read_StreamsInfo(a, si) < 0) {
2750                 if (errno == ENOMEM)
2751                         archive_set_error(&a->archive, -1,
2752                             "Couldn't allocate memory");
2753                 else
2754                         archive_set_error(&a->archive, -1,
2755                             "Malformed 7-Zip archive");
2756                 return (ARCHIVE_FATAL);
2757         }
2758
2759         if (si->pi.numPackStreams == 0 || si->ci.numFolders == 0) {
2760                 archive_set_error(&a->archive, -1, "Malformed 7-Zip archive");
2761                 return (ARCHIVE_FATAL);
2762         }
2763
2764         if (zip->header_offset < si->pi.pos + si->pi.sizes[0] ||
2765             (int64_t)(si->pi.pos + si->pi.sizes[0]) < 0 ||
2766             si->pi.sizes[0] == 0 || (int64_t)si->pi.pos < 0) {
2767                 archive_set_error(&a->archive, -1, "Malformed Header offset");
2768                 return (ARCHIVE_FATAL);
2769         }
2770
2771         return (ARCHIVE_OK);
2772 }
2773
2774 static const unsigned char *
2775 header_bytes(struct archive_read *a, size_t rbytes)
2776 {
2777         struct _7zip *zip = (struct _7zip *)a->format->data;
2778         const unsigned char *p;
2779
2780         if (zip->header_bytes_remaining < rbytes)
2781                 return (NULL);
2782         if (zip->pack_stream_bytes_unconsumed)
2783                 read_consume(a);
2784
2785         if (zip->header_is_encoded == 0) {
2786                 p = __archive_read_ahead(a, rbytes, NULL);
2787                 if (p == NULL)
2788                         return (NULL);
2789                 zip->header_bytes_remaining -= rbytes;
2790                 zip->pack_stream_bytes_unconsumed = rbytes;
2791         } else {
2792                 const void *buff;
2793                 ssize_t bytes;
2794
2795                 bytes = read_stream(a, &buff, rbytes, rbytes);
2796                 if (bytes <= 0)
2797                         return (NULL);
2798                 zip->header_bytes_remaining -= bytes;
2799                 p = buff;
2800         }
2801
2802         /* Update checksum */
2803         zip->header_crc32 = crc32(zip->header_crc32, p, (unsigned)rbytes);
2804         return (p);
2805 }
2806
2807 static int
2808 slurp_central_directory(struct archive_read *a, struct _7zip *zip,
2809     struct _7z_header_info *header)
2810 {
2811         const unsigned char *p;
2812         uint64_t next_header_offset;
2813         uint64_t next_header_size;
2814         uint32_t next_header_crc;
2815         ssize_t bytes_avail;
2816         int check_header_crc, r;
2817
2818         if ((p = __archive_read_ahead(a, 32, &bytes_avail)) == NULL)
2819                 return (ARCHIVE_FATAL);
2820
2821         if ((p[0] == 'M' && p[1] == 'Z') || memcmp(p, "\x7F\x45LF", 4) == 0) {
2822                 /* This is an executable ? Must be self-extracting... */
2823                 r = skip_sfx(a, bytes_avail);
2824                 if (r < ARCHIVE_WARN)
2825                         return (r);
2826                 if ((p = __archive_read_ahead(a, 32, &bytes_avail)) == NULL)
2827                         return (ARCHIVE_FATAL);
2828         }
2829         zip->seek_base += 32;
2830
2831         if (memcmp(p, _7ZIP_SIGNATURE, 6) != 0) {
2832                 archive_set_error(&a->archive, -1, "Not 7-Zip archive file");
2833                 return (ARCHIVE_FATAL);
2834         }
2835
2836         /* CRC check. */
2837         if (crc32(0, (const unsigned char *)p + 12, 20)
2838             != archive_le32dec(p + 8)) {
2839                 archive_set_error(&a->archive, -1, "Header CRC error");
2840                 return (ARCHIVE_FATAL);
2841         }
2842
2843         next_header_offset = archive_le64dec(p + 12);
2844         next_header_size = archive_le64dec(p + 20);
2845         next_header_crc = archive_le32dec(p + 28);
2846
2847         if (next_header_size == 0)
2848                 /* There is no entry in an archive file. */
2849                 return (ARCHIVE_EOF);
2850
2851         if (((int64_t)next_header_offset) < 0) {
2852                 archive_set_error(&a->archive, -1, "Malformed 7-Zip archive");
2853                 return (ARCHIVE_FATAL);
2854         }
2855         __archive_read_consume(a, 32);
2856         if (next_header_offset != 0) {
2857                 if (bytes_avail >= (ssize_t)next_header_offset)
2858                         __archive_read_consume(a, next_header_offset);
2859                 else if (__archive_read_seek(a,
2860                     next_header_offset + zip->seek_base, SEEK_SET) < 0)
2861                         return (ARCHIVE_FATAL);
2862         }
2863         zip->stream_offset = next_header_offset;
2864         zip->header_offset = next_header_offset;
2865         zip->header_bytes_remaining = next_header_size;
2866         zip->header_crc32 = 0;
2867         zip->header_is_encoded = 0;
2868         zip->header_is_being_read = 1;
2869         zip->has_encrypted_entries = 0;
2870         check_header_crc = 1;
2871
2872         if ((p = header_bytes(a, 1)) == NULL) {
2873                 archive_set_error(&a->archive,
2874                     ARCHIVE_ERRNO_FILE_FORMAT,
2875                     "Truncated 7-Zip file body");
2876                 return (ARCHIVE_FATAL);
2877         }
2878         /* Parse ArchiveProperties. */
2879         switch (p[0]) {
2880         case kEncodedHeader:
2881                 /*
2882                  * The archive has an encoded header and we have to decode it
2883                  * in order to parse the header correctly.
2884                  */
2885                 r = decode_encoded_header_info(a, &(zip->si));
2886
2887                 /* Check the EncodedHeader CRC.*/
2888                 if (r == 0 && zip->header_crc32 != next_header_crc) {
2889                         archive_set_error(&a->archive, -1,
2890                             "Damaged 7-Zip archive");
2891                         r = -1;
2892                 }
2893                 if (r == 0) {
2894                         if (zip->si.ci.folders[0].digest_defined)
2895                                 next_header_crc = zip->si.ci.folders[0].digest;
2896                         else
2897                                 check_header_crc = 0;
2898                         if (zip->pack_stream_bytes_unconsumed)
2899                                 read_consume(a);
2900                         r = setup_decode_folder(a, zip->si.ci.folders, 1);
2901                         if (r == 0) {
2902                                 zip->header_bytes_remaining =
2903                                         zip->folder_outbytes_remaining;
2904                                 r = seek_pack(a);
2905                         }
2906                 }
2907                 /* Clean up StreamsInfo. */
2908                 free_StreamsInfo(&(zip->si));
2909                 memset(&(zip->si), 0, sizeof(zip->si));
2910                 if (r < 0)
2911                         return (ARCHIVE_FATAL);
2912                 zip->header_is_encoded = 1;
2913                 zip->header_crc32 = 0;
2914                 /* FALL THROUGH */
2915         case kHeader:
2916                 /*
2917                  * Parse the header.
2918                  */
2919                 errno = 0;
2920                 r = read_Header(a, header, zip->header_is_encoded);
2921                 if (r < 0) {
2922                         if (errno == ENOMEM)
2923                                 archive_set_error(&a->archive, -1,
2924                                     "Couldn't allocate memory");
2925                         else
2926                                 archive_set_error(&a->archive, -1,
2927                                     "Damaged 7-Zip archive");
2928                         return (ARCHIVE_FATAL);
2929                 }
2930
2931                 /*
2932                  *  Must be kEnd.
2933                  */
2934                 if ((p = header_bytes(a, 1)) == NULL ||*p != kEnd) {
2935                         archive_set_error(&a->archive, -1,
2936                             "Malformed 7-Zip archive");
2937                         return (ARCHIVE_FATAL);
2938                 }
2939
2940                 /* Check the Header CRC.*/
2941                 if (check_header_crc && zip->header_crc32 != next_header_crc) {
2942                         archive_set_error(&a->archive, -1,
2943                             "Malformed 7-Zip archive");
2944                         return (ARCHIVE_FATAL);
2945                 }
2946                 break;
2947         default:
2948                 archive_set_error(&a->archive, -1,
2949                     "Unexpected Property ID = %X", p[0]);
2950                 return (ARCHIVE_FATAL);
2951         }
2952
2953         /* Clean up variables be used for decoding the archive header */
2954         zip->pack_stream_remaining = 0;
2955         zip->pack_stream_index = 0;
2956         zip->folder_outbytes_remaining = 0;
2957         zip->uncompressed_buffer_bytes_remaining = 0;
2958         zip->pack_stream_bytes_unconsumed = 0;
2959         zip->header_is_being_read = 0;
2960
2961         return (ARCHIVE_OK);
2962 }
2963
2964 static ssize_t
2965 get_uncompressed_data(struct archive_read *a, const void **buff, size_t size,
2966     size_t minimum)
2967 {
2968         struct _7zip *zip = (struct _7zip *)a->format->data;
2969         ssize_t bytes_avail;
2970
2971         if (zip->codec == _7Z_COPY && zip->codec2 == (unsigned long)-1) {
2972                 /* Copy mode. */
2973
2974                 /*
2975                  * Note: '1' here is a performance optimization.
2976                  * Recall that the decompression layer returns a count of
2977                  * available bytes; asking for more than that forces the
2978                  * decompressor to combine reads by copying data.
2979                  */
2980                 *buff = __archive_read_ahead(a, 1, &bytes_avail);
2981                 if (bytes_avail <= 0) {
2982                         archive_set_error(&a->archive,
2983                             ARCHIVE_ERRNO_FILE_FORMAT,
2984                             "Truncated 7-Zip file data");
2985                         return (ARCHIVE_FATAL);
2986                 }
2987                 if ((size_t)bytes_avail >
2988                     zip->uncompressed_buffer_bytes_remaining)
2989                         bytes_avail = (ssize_t)
2990                             zip->uncompressed_buffer_bytes_remaining;
2991                 if ((size_t)bytes_avail > size)
2992                         bytes_avail = (ssize_t)size;
2993
2994                 zip->pack_stream_bytes_unconsumed = bytes_avail;
2995         } else if (zip->uncompressed_buffer_pointer == NULL) {
2996                 /* Decompression has failed. */
2997                 archive_set_error(&(a->archive),
2998                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
2999                 return (ARCHIVE_FATAL);
3000         } else {
3001                 /* Packed mode. */
3002                 if (minimum > zip->uncompressed_buffer_bytes_remaining) {
3003                         /*
3004                          * If remaining uncompressed data size is less than
3005                          * the minimum size, fill the buffer up to the
3006                          * minimum size.
3007                          */
3008                         if (extract_pack_stream(a, minimum) < 0)
3009                                 return (ARCHIVE_FATAL);
3010                 }
3011                 if (size > zip->uncompressed_buffer_bytes_remaining)
3012                         bytes_avail = (ssize_t)
3013                             zip->uncompressed_buffer_bytes_remaining;
3014                 else
3015                         bytes_avail = (ssize_t)size;
3016                 *buff = zip->uncompressed_buffer_pointer;
3017                 zip->uncompressed_buffer_pointer += bytes_avail;
3018         }
3019         zip->uncompressed_buffer_bytes_remaining -= bytes_avail;
3020         return (bytes_avail);
3021 }
3022
3023 static ssize_t
3024 extract_pack_stream(struct archive_read *a, size_t minimum)
3025 {
3026         struct _7zip *zip = (struct _7zip *)a->format->data;
3027         ssize_t bytes_avail;
3028         int r;
3029
3030         if (zip->codec == _7Z_COPY && zip->codec2 == (unsigned long)-1) {
3031                 if (minimum == 0)
3032                         minimum = 1;
3033                 if (__archive_read_ahead(a, minimum, &bytes_avail) == NULL
3034                     || bytes_avail <= 0) {
3035                         archive_set_error(&a->archive,
3036                             ARCHIVE_ERRNO_FILE_FORMAT,
3037                             "Truncated 7-Zip file body");
3038                         return (ARCHIVE_FATAL);
3039                 }
3040                 if (bytes_avail > (ssize_t)zip->pack_stream_inbytes_remaining)
3041                         bytes_avail = (ssize_t)zip->pack_stream_inbytes_remaining;
3042                 zip->pack_stream_inbytes_remaining -= bytes_avail;
3043                 if (bytes_avail > (ssize_t)zip->folder_outbytes_remaining)
3044                         bytes_avail = (ssize_t)zip->folder_outbytes_remaining;
3045                 zip->folder_outbytes_remaining -= bytes_avail;
3046                 zip->uncompressed_buffer_bytes_remaining = bytes_avail;
3047                 return (ARCHIVE_OK);
3048         }
3049
3050         /* If the buffer hasn't been allocated, allocate it now. */
3051         if (zip->uncompressed_buffer == NULL) {
3052                 zip->uncompressed_buffer_size = UBUFF_SIZE;
3053                 if (zip->uncompressed_buffer_size < minimum) {
3054                         zip->uncompressed_buffer_size = minimum + 1023;
3055                         zip->uncompressed_buffer_size &= ~0x3ff;
3056                 }
3057                 zip->uncompressed_buffer =
3058                     malloc(zip->uncompressed_buffer_size);
3059                 if (zip->uncompressed_buffer == NULL) {
3060                         archive_set_error(&a->archive, ENOMEM,
3061                             "No memory for 7-Zip decompression");
3062                         return (ARCHIVE_FATAL);
3063                 }
3064                 zip->uncompressed_buffer_bytes_remaining = 0;
3065         } else if (zip->uncompressed_buffer_size < minimum ||
3066             zip->uncompressed_buffer_bytes_remaining < minimum) {
3067                 /*
3068                  * Make sure the uncompressed buffer can have bytes
3069                  * at least `minimum' bytes.
3070                  * NOTE: This case happen when reading the header.
3071                  */
3072                 size_t used;
3073                 if (zip->uncompressed_buffer_pointer != 0)
3074                         used = zip->uncompressed_buffer_pointer -
3075                                 zip->uncompressed_buffer;
3076                 else
3077                         used = 0;
3078                 if (zip->uncompressed_buffer_size < minimum) {
3079                         /*
3080                          * Expand the uncompressed buffer up to
3081                          * the minimum size.
3082                          */
3083                         void *p;
3084                         size_t new_size;
3085
3086                         new_size = minimum + 1023;
3087                         new_size &= ~0x3ff;
3088                         p = realloc(zip->uncompressed_buffer, new_size);
3089                         if (p == NULL) {
3090                                 archive_set_error(&a->archive, ENOMEM,
3091                                     "No memory for 7-Zip decompression");
3092                                 return (ARCHIVE_FATAL);
3093                         }
3094                         zip->uncompressed_buffer = (unsigned char *)p;
3095                         zip->uncompressed_buffer_size = new_size;
3096                 }
3097                 /*
3098                  * Move unconsumed bytes to the head.
3099                  */
3100                 if (used) {
3101                         memmove(zip->uncompressed_buffer,
3102                                 zip->uncompressed_buffer + used,
3103                                 zip->uncompressed_buffer_bytes_remaining);
3104                 }
3105         } else
3106                 zip->uncompressed_buffer_bytes_remaining = 0;
3107         zip->uncompressed_buffer_pointer = NULL;
3108         for (;;) {
3109                 size_t bytes_in, bytes_out;
3110                 const void *buff_in;
3111                 unsigned char *buff_out;
3112                 int end_of_data;
3113
3114                 /*
3115                  * Note: '1' here is a performance optimization.
3116                  * Recall that the decompression layer returns a count of
3117                  * available bytes; asking for more than that forces the
3118                  * decompressor to combine reads by copying data.
3119                  */
3120                 buff_in = __archive_read_ahead(a, 1, &bytes_avail);
3121                 if (bytes_avail <= 0) {
3122                         archive_set_error(&a->archive,
3123                             ARCHIVE_ERRNO_FILE_FORMAT,
3124                             "Truncated 7-Zip file body");
3125                         return (ARCHIVE_FATAL);
3126                 }
3127
3128                 buff_out = zip->uncompressed_buffer
3129                         + zip->uncompressed_buffer_bytes_remaining;
3130                 bytes_out = zip->uncompressed_buffer_size
3131                         - zip->uncompressed_buffer_bytes_remaining;
3132                 bytes_in = bytes_avail;
3133                 if (bytes_in > zip->pack_stream_inbytes_remaining)
3134                         bytes_in = (size_t)zip->pack_stream_inbytes_remaining;
3135                 /* Drive decompression. */
3136                 r = decompress(a, zip, buff_out, &bytes_out,
3137                         buff_in, &bytes_in);
3138                 switch (r) {
3139                 case ARCHIVE_OK:
3140                         end_of_data = 0;
3141                         break;
3142                 case ARCHIVE_EOF:
3143                         end_of_data = 1;
3144                         break;
3145                 default:
3146                         return (ARCHIVE_FATAL);
3147                 }
3148                 zip->pack_stream_inbytes_remaining -= bytes_in;
3149                 if (bytes_out > zip->folder_outbytes_remaining)
3150                         bytes_out = (size_t)zip->folder_outbytes_remaining;
3151                 zip->folder_outbytes_remaining -= bytes_out;
3152                 zip->uncompressed_buffer_bytes_remaining += bytes_out;
3153                 zip->pack_stream_bytes_unconsumed = bytes_in;
3154
3155                 /*
3156                  * Continue decompression until uncompressed_buffer is full.
3157                  */
3158                 if (zip->uncompressed_buffer_bytes_remaining ==
3159                     zip->uncompressed_buffer_size)
3160                         break;
3161                 if (zip->codec2 == _7Z_X86 && zip->odd_bcj_size &&
3162                     zip->uncompressed_buffer_bytes_remaining + 5 >
3163                     zip->uncompressed_buffer_size)
3164                         break;
3165                 if (zip->pack_stream_inbytes_remaining == 0 &&
3166                     zip->folder_outbytes_remaining == 0)
3167                         break;
3168                 if (end_of_data || (bytes_in == 0 && bytes_out == 0)) {
3169                         archive_set_error(&(a->archive),
3170                             ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3171                         return (ARCHIVE_FATAL);
3172                 }
3173                 read_consume(a);
3174         }
3175         if (zip->uncompressed_buffer_bytes_remaining < minimum) {
3176                 archive_set_error(&(a->archive),
3177                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3178                 return (ARCHIVE_FATAL);
3179         }
3180         zip->uncompressed_buffer_pointer = zip->uncompressed_buffer;
3181         return (ARCHIVE_OK);
3182 }
3183
3184 static int
3185 seek_pack(struct archive_read *a)
3186 {
3187         struct _7zip *zip = (struct _7zip *)a->format->data;
3188         int64_t pack_offset;
3189
3190         if (zip->pack_stream_remaining <= 0) {
3191                 archive_set_error(&(a->archive),
3192                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3193                 return (ARCHIVE_FATAL);
3194         }
3195         zip->pack_stream_inbytes_remaining =
3196             zip->si.pi.sizes[zip->pack_stream_index];
3197         pack_offset = zip->si.pi.positions[zip->pack_stream_index];
3198         if (zip->stream_offset != pack_offset) {
3199                 if (0 > __archive_read_seek(a, pack_offset + zip->seek_base,
3200                     SEEK_SET))
3201                         return (ARCHIVE_FATAL);
3202                 zip->stream_offset = pack_offset;
3203         }
3204         zip->pack_stream_index++;
3205         zip->pack_stream_remaining--;
3206         return (ARCHIVE_OK);
3207 }
3208
3209 static ssize_t
3210 read_stream(struct archive_read *a, const void **buff, size_t size,
3211     size_t minimum)
3212 {
3213         struct _7zip *zip = (struct _7zip *)a->format->data;
3214         uint64_t skip_bytes = 0;
3215         ssize_t r;
3216
3217         if (zip->uncompressed_buffer_bytes_remaining == 0) {
3218                 if (zip->pack_stream_inbytes_remaining > 0) {
3219                         r = extract_pack_stream(a, 0);
3220                         if (r < 0)
3221                                 return (r);
3222                         return (get_uncompressed_data(a, buff, size, minimum));
3223                 } else if (zip->folder_outbytes_remaining > 0) {
3224                         /* Extract a remaining pack stream. */
3225                         r = extract_pack_stream(a, 0);
3226                         if (r < 0)
3227                                 return (r);
3228                         return (get_uncompressed_data(a, buff, size, minimum));
3229                 }
3230         } else
3231                 return (get_uncompressed_data(a, buff, size, minimum));
3232
3233         /*
3234          * Current pack stream has been consumed.
3235          */
3236         if (zip->pack_stream_remaining == 0) {
3237                 if (zip->header_is_being_read) {
3238                         /* Invalid sequence. This might happen when
3239                          * reading a malformed archive. */
3240                         archive_set_error(&(a->archive),
3241                             ARCHIVE_ERRNO_MISC, "Malformed 7-Zip archive");
3242                         return (ARCHIVE_FATAL);
3243                 }
3244
3245                 /*
3246                  * All current folder's pack streams have been
3247                  * consumed. Switch to next folder.
3248                  */
3249                 if (zip->folder_index == 0 &&
3250                     (zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes
3251                      || zip->folder_index != zip->entry->folderIndex)) {
3252                         zip->folder_index = zip->entry->folderIndex;
3253                         skip_bytes =
3254                             zip->si.ci.folders[zip->folder_index].skipped_bytes;
3255                 }
3256
3257                 if (zip->folder_index >= zip->si.ci.numFolders) {
3258                         /*
3259                          * We have consumed all folders and its pack streams.
3260                          */
3261                         *buff = NULL;
3262                         return (0);
3263                 }
3264                 r = setup_decode_folder(a,
3265                         &(zip->si.ci.folders[zip->folder_index]), 0);
3266                 if (r != ARCHIVE_OK)
3267                         return (ARCHIVE_FATAL);
3268
3269                 zip->folder_index++;
3270         }
3271
3272         /*
3273          * Switch to next pack stream.
3274          */
3275         r = seek_pack(a);
3276         if (r < 0)
3277                 return (r);
3278
3279         /* Extract a new pack stream. */
3280         r = extract_pack_stream(a, 0);
3281         if (r < 0)
3282                 return (r);
3283
3284         /*
3285          * Skip the bytes we alrady has skipped in skip_stream().
3286          */
3287         while (skip_bytes) {
3288                 ssize_t skipped;
3289
3290                 if (zip->uncompressed_buffer_bytes_remaining == 0) {
3291                         if (zip->pack_stream_inbytes_remaining > 0) {
3292                                 r = extract_pack_stream(a, 0);
3293                                 if (r < 0)
3294                                         return (r);
3295                         } else if (zip->folder_outbytes_remaining > 0) {
3296                                 /* Extract a remaining pack stream. */
3297                                 r = extract_pack_stream(a, 0);
3298                                 if (r < 0)
3299                                         return (r);
3300                         } else {
3301                                 archive_set_error(&a->archive,
3302                                     ARCHIVE_ERRNO_FILE_FORMAT,
3303                                     "Truncated 7-Zip file body");
3304                                 return (ARCHIVE_FATAL);
3305                         }
3306                 }
3307                 skipped = get_uncompressed_data(
3308                         a, buff, (size_t)skip_bytes, 0);
3309                 if (skipped < 0)
3310                         return (skipped);
3311                 skip_bytes -= skipped;
3312                 if (zip->pack_stream_bytes_unconsumed)
3313                         read_consume(a);
3314         }
3315
3316         return (get_uncompressed_data(a, buff, size, minimum));
3317 }
3318
3319 static int
3320 setup_decode_folder(struct archive_read *a, struct _7z_folder *folder,
3321     int header)
3322 {
3323         struct _7zip *zip = (struct _7zip *)a->format->data;
3324         const struct _7z_coder *coder1, *coder2;
3325         const char *cname = (header)?"archive header":"file content";
3326         unsigned i;
3327         int r, found_bcj2 = 0;
3328
3329         /*
3330          * Release the memory which the previous folder used for BCJ2.
3331          */
3332         for (i = 0; i < 3; i++) {
3333                 if (zip->sub_stream_buff[i] != NULL)
3334                         free(zip->sub_stream_buff[i]);
3335                 zip->sub_stream_buff[i] = NULL;
3336         }
3337
3338         /*
3339          * Initialize a stream reader.
3340          */
3341         zip->pack_stream_remaining = (unsigned)folder->numPackedStreams;
3342         zip->pack_stream_index = (unsigned)folder->packIndex;
3343         zip->folder_outbytes_remaining = folder_uncompressed_size(folder);
3344         zip->uncompressed_buffer_bytes_remaining = 0;
3345
3346         /*
3347          * Check coder types.
3348          */
3349         for (i = 0; i < folder->numCoders; i++) {
3350                 switch(folder->coders[i].codec) {
3351                         case _7Z_CRYPTO_MAIN_ZIP:
3352                         case _7Z_CRYPTO_RAR_29:
3353                         case _7Z_CRYPTO_AES_256_SHA_256: {
3354                                 /* For entry that is associated with this folder, mark
3355                                    it as encrypted (data+metadata). */
3356                                 zip->has_encrypted_entries = 1;
3357                                 if (a->entry) {
3358                                         archive_entry_set_is_data_encrypted(a->entry, 1);
3359                                         archive_entry_set_is_metadata_encrypted(a->entry, 1);
3360                                 }
3361                                 archive_set_error(&(a->archive),
3362                                         ARCHIVE_ERRNO_MISC,
3363                                         "The %s is encrypted, "
3364                                         "but currently not supported", cname);
3365                                 return (ARCHIVE_FATAL);
3366                         }
3367                         case _7Z_X86_BCJ2: {
3368                                 found_bcj2++;
3369                                 break;
3370                         }
3371                 }
3372         }
3373         /* Now that we've checked for encryption, if there were still no
3374          * encrypted entries found we can say for sure that there are none.
3375          */
3376         if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
3377                 zip->has_encrypted_entries = 0;
3378         }
3379
3380         if ((folder->numCoders > 2 && !found_bcj2) || found_bcj2 > 1) {
3381                 archive_set_error(&(a->archive),
3382                     ARCHIVE_ERRNO_MISC,
3383                     "The %s is encoded with many filters, "
3384                     "but currently not supported", cname);
3385                 return (ARCHIVE_FATAL);
3386         }
3387         coder1 = &(folder->coders[0]);
3388         if (folder->numCoders == 2)
3389                 coder2 = &(folder->coders[1]);
3390         else
3391                 coder2 = NULL;
3392
3393         if (found_bcj2) {
3394                 /*
3395                  * Preparation to decode BCJ2.
3396                  * Decoding BCJ2 requires four sources. Those are at least,
3397                  * as far as I know, two types of the storage form.
3398                  */
3399                 const struct _7z_coder *fc = folder->coders;
3400                 static const struct _7z_coder coder_copy = {0, 1, 1, 0, NULL};
3401                 const struct _7z_coder *scoder[3] =
3402                         {&coder_copy, &coder_copy, &coder_copy};
3403                 const void *buff;
3404                 ssize_t bytes;
3405                 unsigned char *b[3] = {NULL, NULL, NULL};
3406                 uint64_t sunpack[3] ={-1, -1, -1};
3407                 size_t s[3] = {0, 0, 0};
3408                 int idx[3] = {0, 1, 2};
3409
3410                 if (folder->numCoders == 4 && fc[3].codec == _7Z_X86_BCJ2 &&
3411                     folder->numInStreams == 7 && folder->numOutStreams == 4 &&
3412                     zip->pack_stream_remaining == 4) {
3413                         /* Source type 1 made by 7zr or 7z with -m options. */
3414                         if (folder->bindPairs[0].inIndex == 5) {
3415                                 /* The form made by 7zr */
3416                                 idx[0] = 1; idx[1] = 2; idx[2] = 0;
3417                                 scoder[1] = &(fc[1]);
3418                                 scoder[2] = &(fc[0]);
3419                                 sunpack[1] = folder->unPackSize[1];
3420                                 sunpack[2] = folder->unPackSize[0];
3421                                 coder1 = &(fc[2]);
3422                         } else {
3423                                 /*
3424                                  * NOTE: Some patterns do not work.
3425                                  * work:
3426                                  *  7z a -m0=BCJ2 -m1=COPY -m2=COPY
3427                                  *       -m3=(any)
3428                                  *  7z a -m0=BCJ2 -m1=COPY -m2=(any)
3429                                  *       -m3=COPY
3430                                  *  7z a -m0=BCJ2 -m1=(any) -m2=COPY
3431                                  *       -m3=COPY
3432                                  * not work:
3433                                  *  other patterns.
3434                                  *
3435                                  * We have to handle this like `pipe' or
3436                                  * our libarchive7s filter frame work,
3437                                  * decoding the BCJ2 main stream sequentially,
3438                                  * m3 -> m2 -> m1 -> BCJ2.
3439                                  *
3440                                  */
3441                                 if (fc[0].codec == _7Z_COPY &&
3442                                     fc[1].codec == _7Z_COPY)
3443                                         coder1 = &(folder->coders[2]);
3444                                 else if (fc[0].codec == _7Z_COPY &&
3445                                     fc[2].codec == _7Z_COPY)
3446                                         coder1 = &(folder->coders[1]);
3447                                 else if (fc[1].codec == _7Z_COPY &&
3448                                     fc[2].codec == _7Z_COPY)
3449                                         coder1 = &(folder->coders[0]);
3450                                 else {
3451                                         archive_set_error(&(a->archive),
3452                                             ARCHIVE_ERRNO_MISC,
3453                                             "Unsupported form of "
3454                                             "BCJ2 streams");
3455                                         return (ARCHIVE_FATAL);
3456                                 }
3457                         }
3458                         coder2 = &(fc[3]);
3459                         zip->main_stream_bytes_remaining =
3460                                 (size_t)folder->unPackSize[2];
3461                 } else if (coder2 != NULL && coder2->codec == _7Z_X86_BCJ2 &&
3462                     zip->pack_stream_remaining == 4 &&
3463                     folder->numInStreams == 5 && folder->numOutStreams == 2) {
3464                         /* Source type 0 made by 7z */
3465                         zip->main_stream_bytes_remaining =
3466                                 (size_t)folder->unPackSize[0];
3467                 } else {
3468                         /* We got an unexpected form. */
3469                         archive_set_error(&(a->archive),
3470                             ARCHIVE_ERRNO_MISC,
3471                             "Unsupported form of BCJ2 streams");
3472                         return (ARCHIVE_FATAL);
3473                 }
3474
3475                 /* Skip the main stream at this time. */
3476                 if ((r = seek_pack(a)) < 0)
3477                         return (r);
3478                 zip->pack_stream_bytes_unconsumed =
3479                     (size_t)zip->pack_stream_inbytes_remaining;
3480                 read_consume(a);
3481
3482                 /* Read following three sub streams. */
3483                 for (i = 0; i < 3; i++) {
3484                         const struct _7z_coder *coder = scoder[i];
3485
3486                         if ((r = seek_pack(a)) < 0) {
3487                                 free(b[0]); free(b[1]); free(b[2]);
3488                                 return (r);
3489                         }
3490
3491                         if (sunpack[i] == (uint64_t)-1)
3492                                 zip->folder_outbytes_remaining =
3493                                     zip->pack_stream_inbytes_remaining;
3494                         else
3495                                 zip->folder_outbytes_remaining = sunpack[i];
3496
3497                         r = init_decompression(a, zip, coder, NULL);
3498                         if (r != ARCHIVE_OK) {
3499                                 free(b[0]); free(b[1]); free(b[2]);
3500                                 return (ARCHIVE_FATAL);
3501                         }
3502
3503                         /* Allocate memory for the decorded data of a sub
3504                          * stream. */
3505                         b[i] = malloc((size_t)zip->folder_outbytes_remaining);
3506                         if (b[i] == NULL) {
3507                                 free(b[0]); free(b[1]); free(b[2]);
3508                                 archive_set_error(&a->archive, ENOMEM,
3509                                     "No memory for 7-Zip decompression");
3510                                 return (ARCHIVE_FATAL);
3511                         }
3512
3513                         /* Extract a sub stream. */
3514                         while (zip->pack_stream_inbytes_remaining > 0) {
3515                                 r = (int)extract_pack_stream(a, 0);
3516                                 if (r < 0) {
3517                                         free(b[0]); free(b[1]); free(b[2]);
3518                                         return (r);
3519                                 }
3520                                 bytes = get_uncompressed_data(a, &buff,
3521                                     zip->uncompressed_buffer_bytes_remaining,
3522                                     0);
3523                                 if (bytes < 0) {
3524                                         free(b[0]); free(b[1]); free(b[2]);
3525                                         return ((int)bytes);
3526                                 }
3527                                 memcpy(b[i]+s[i], buff, bytes);
3528                                 s[i] += bytes;
3529                                 if (zip->pack_stream_bytes_unconsumed)
3530                                         read_consume(a);
3531                         }
3532                 }
3533
3534                 /* Set the sub streams to the right place. */
3535                 for (i = 0; i < 3; i++) {
3536                         zip->sub_stream_buff[i] = b[idx[i]];
3537                         zip->sub_stream_size[i] = s[idx[i]];
3538                         zip->sub_stream_bytes_remaining[i] = s[idx[i]];
3539                 }
3540
3541                 /* Allocate memory used for decoded main stream bytes. */
3542                 if (zip->tmp_stream_buff == NULL) {
3543                         zip->tmp_stream_buff_size = 32 * 1024;
3544                         zip->tmp_stream_buff =
3545                             malloc(zip->tmp_stream_buff_size);
3546                         if (zip->tmp_stream_buff == NULL) {
3547                                 archive_set_error(&a->archive, ENOMEM,
3548                                     "No memory for 7-Zip decompression");
3549                                 return (ARCHIVE_FATAL);
3550                         }
3551                 }
3552                 zip->tmp_stream_bytes_avail = 0;
3553                 zip->tmp_stream_bytes_remaining = 0;
3554                 zip->odd_bcj_size = 0;
3555                 zip->bcj2_outPos = 0;
3556
3557                 /*
3558                  * Reset a stream reader in order to read the main stream
3559                  * of BCJ2.
3560                  */
3561                 zip->pack_stream_remaining = 1;
3562                 zip->pack_stream_index = (unsigned)folder->packIndex;
3563                 zip->folder_outbytes_remaining =
3564                     folder_uncompressed_size(folder);
3565                 zip->uncompressed_buffer_bytes_remaining = 0;
3566         }
3567
3568         /*
3569          * Initialize the decompressor for the new folder's pack streams.
3570          */
3571         r = init_decompression(a, zip, coder1, coder2);
3572         if (r != ARCHIVE_OK)
3573                 return (ARCHIVE_FATAL);
3574         return (ARCHIVE_OK);
3575 }
3576
3577 static int64_t
3578 skip_stream(struct archive_read *a, size_t skip_bytes)
3579 {
3580         struct _7zip *zip = (struct _7zip *)a->format->data;
3581         const void *p;
3582         int64_t skipped_bytes;
3583         size_t bytes = skip_bytes;
3584
3585         if (zip->folder_index == 0) {
3586                 /*
3587                  * Optimization for a list mode.
3588                  * Avoid unncecessary decoding operations.
3589                  */
3590                 zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes
3591                     += skip_bytes;
3592                 return (skip_bytes);
3593         }
3594
3595         while (bytes) {
3596                 skipped_bytes = read_stream(a, &p, bytes, 0);
3597                 if (skipped_bytes < 0)
3598                         return (skipped_bytes);
3599                 if (skipped_bytes == 0) {
3600                         archive_set_error(&a->archive,
3601                             ARCHIVE_ERRNO_FILE_FORMAT,
3602                             "Truncated 7-Zip file body");
3603                         return (ARCHIVE_FATAL);
3604                 }
3605                 bytes -= (size_t)skipped_bytes;
3606                 if (zip->pack_stream_bytes_unconsumed)
3607                         read_consume(a);
3608         }
3609         return (skip_bytes);
3610 }
3611
3612 /*
3613  * Brought from LZMA SDK.
3614  *
3615  * Bra86.c -- Converter for x86 code (BCJ)
3616  * 2008-10-04 : Igor Pavlov : Public domain
3617  *
3618  */
3619
3620 #define Test86MSByte(b) ((b) == 0 || (b) == 0xFF)
3621
3622 static void
3623 x86_Init(struct _7zip *zip)
3624 {
3625         zip->bcj_state = 0;
3626         zip->bcj_prevPosT = (size_t)0 - 1;
3627         zip->bcj_prevMask = 0;
3628         zip->bcj_ip = 5;
3629 }
3630
3631 static size_t
3632 x86_Convert(struct _7zip *zip, uint8_t *data, size_t size)
3633 {
3634         static const uint8_t kMaskToAllowedStatus[8] = {1, 1, 1, 0, 1, 0, 0, 0};
3635         static const uint8_t kMaskToBitNumber[8] = {0, 1, 2, 2, 3, 3, 3, 3};
3636         size_t bufferPos, prevPosT;
3637         uint32_t ip, prevMask;
3638
3639         if (size < 5)
3640                 return 0;
3641
3642         bufferPos = 0;
3643         prevPosT = zip->bcj_prevPosT;
3644         prevMask = zip->bcj_prevMask;
3645         ip = zip->bcj_ip;
3646
3647         for (;;) {
3648                 uint8_t *p = data + bufferPos;
3649                 uint8_t *limit = data + size - 4;
3650
3651                 for (; p < limit; p++)
3652                         if ((*p & 0xFE) == 0xE8)
3653                                 break;
3654                 bufferPos = (size_t)(p - data);
3655                 if (p >= limit)
3656                         break;
3657                 prevPosT = bufferPos - prevPosT;
3658                 if (prevPosT > 3)
3659                         prevMask = 0;
3660                 else {
3661                         prevMask = (prevMask << ((int)prevPosT - 1)) & 0x7;
3662                         if (prevMask != 0) {
3663                                 unsigned char b =
3664                                         p[4 - kMaskToBitNumber[prevMask]];
3665                                 if (!kMaskToAllowedStatus[prevMask] ||
3666                                     Test86MSByte(b)) {
3667                                         prevPosT = bufferPos;
3668                                         prevMask = ((prevMask << 1) & 0x7) | 1;
3669                                         bufferPos++;
3670                                         continue;
3671                                 }
3672                         }
3673                 }
3674                 prevPosT = bufferPos;
3675
3676                 if (Test86MSByte(p[4])) {
3677                         uint32_t src = ((uint32_t)p[4] << 24) |
3678                                 ((uint32_t)p[3] << 16) | ((uint32_t)p[2] << 8) |
3679                                 ((uint32_t)p[1]);
3680                         uint32_t dest;
3681                         for (;;) {
3682                                 uint8_t b;
3683                                 int b_index;
3684
3685                                 dest = src - (ip + (uint32_t)bufferPos);
3686                                 if (prevMask == 0)
3687                                         break;
3688                                 b_index = kMaskToBitNumber[prevMask] * 8;
3689                                 b = (uint8_t)(dest >> (24 - b_index));
3690                                 if (!Test86MSByte(b))
3691                                         break;
3692                                 src = dest ^ ((1 << (32 - b_index)) - 1);
3693                         }
3694                         p[4] = (uint8_t)(~(((dest >> 24) & 1) - 1));
3695                         p[3] = (uint8_t)(dest >> 16);
3696                         p[2] = (uint8_t)(dest >> 8);
3697                         p[1] = (uint8_t)dest;
3698                         bufferPos += 5;
3699                 } else {
3700                         prevMask = ((prevMask << 1) & 0x7) | 1;
3701                         bufferPos++;
3702                 }
3703         }
3704         zip->bcj_prevPosT = prevPosT;
3705         zip->bcj_prevMask = prevMask;
3706         zip->bcj_ip += (uint32_t)bufferPos;
3707         return (bufferPos);
3708 }
3709
3710 /*
3711  * Brought from LZMA SDK.
3712  *
3713  * Bcj2.c -- Converter for x86 code (BCJ2)
3714  * 2008-10-04 : Igor Pavlov : Public domain
3715  *
3716  */
3717
3718 #define SZ_ERROR_DATA    ARCHIVE_FAILED
3719
3720 #define IsJcc(b0, b1) ((b0) == 0x0F && ((b1) & 0xF0) == 0x80)
3721 #define IsJ(b0, b1) ((b1 & 0xFE) == 0xE8 || IsJcc(b0, b1))
3722
3723 #define kNumTopBits 24
3724 #define kTopValue ((uint32_t)1 << kNumTopBits)
3725
3726 #define kNumBitModelTotalBits 11
3727 #define kBitModelTotal (1 << kNumBitModelTotalBits)
3728 #define kNumMoveBits 5
3729
3730 #define RC_READ_BYTE (*buffer++)
3731 #define RC_TEST { if (buffer == bufferLim) return SZ_ERROR_DATA; }
3732 #define RC_INIT2 zip->bcj2_code = 0; zip->bcj2_range = 0xFFFFFFFF; \
3733   { int ii; for (ii = 0; ii < 5; ii++) { RC_TEST; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; }}
3734
3735 #define NORMALIZE if (zip->bcj2_range < kTopValue) { RC_TEST; zip->bcj2_range <<= 8; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; }
3736
3737 #define IF_BIT_0(p) ttt = *(p); bound = (zip->bcj2_range >> kNumBitModelTotalBits) * ttt; if (zip->bcj2_code < bound)
3738 #define UPDATE_0(p) zip->bcj2_range = bound; *(p) = (CProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits)); NORMALIZE;
3739 #define UPDATE_1(p) zip->bcj2_range -= bound; zip->bcj2_code -= bound; *(p) = (CProb)(ttt - (ttt >> kNumMoveBits)); NORMALIZE;
3740
3741 static ssize_t
3742 Bcj2_Decode(struct _7zip *zip, uint8_t *outBuf, size_t outSize)
3743 {
3744         size_t inPos = 0, outPos = 0;
3745         const uint8_t *buf0, *buf1, *buf2, *buf3;
3746         size_t size0, size1, size2, size3;
3747         const uint8_t *buffer, *bufferLim;
3748         unsigned int i, j;
3749
3750         size0 = zip->tmp_stream_bytes_remaining;
3751         buf0 = zip->tmp_stream_buff + zip->tmp_stream_bytes_avail - size0;
3752         size1 = zip->sub_stream_bytes_remaining[0];
3753         buf1 = zip->sub_stream_buff[0] + zip->sub_stream_size[0] - size1;
3754         size2 = zip->sub_stream_bytes_remaining[1];
3755         buf2 = zip->sub_stream_buff[1] + zip->sub_stream_size[1] - size2;
3756         size3 = zip->sub_stream_bytes_remaining[2];
3757         buf3 = zip->sub_stream_buff[2] + zip->sub_stream_size[2] - size3;
3758
3759         buffer = buf3;
3760         bufferLim = buffer + size3;
3761
3762         if (zip->bcj_state == 0) {
3763                 /*
3764                  * Initialize.
3765                  */
3766                 zip->bcj2_prevByte = 0;
3767                 for (i = 0;
3768                     i < sizeof(zip->bcj2_p) / sizeof(zip->bcj2_p[0]); i++)
3769                         zip->bcj2_p[i] = kBitModelTotal >> 1;
3770                 RC_INIT2;
3771                 zip->bcj_state = 1;
3772         }
3773
3774         /*
3775          * Gather the odd bytes of a previous call.
3776          */
3777         for (i = 0; zip->odd_bcj_size > 0 && outPos < outSize; i++) {
3778                 outBuf[outPos++] = zip->odd_bcj[i];
3779                 zip->odd_bcj_size--;
3780         }
3781
3782         if (outSize == 0) {
3783                 zip->bcj2_outPos += outPos;
3784                 return (outPos);
3785         }
3786
3787         for (;;) {
3788                 uint8_t b;
3789                 CProb *prob;
3790                 uint32_t bound;
3791                 uint32_t ttt;
3792
3793                 size_t limit = size0 - inPos;
3794                 if (outSize - outPos < limit)
3795                         limit = outSize - outPos;
3796
3797                 if (zip->bcj_state == 1) {
3798                         while (limit != 0) {
3799                                 uint8_t bb = buf0[inPos];
3800                                 outBuf[outPos++] = bb;
3801                                 if (IsJ(zip->bcj2_prevByte, bb)) {
3802                                         zip->bcj_state = 2;
3803                                         break;
3804                                 }
3805                                 inPos++;
3806                                 zip->bcj2_prevByte = bb;
3807                                 limit--;
3808                         }
3809                 }
3810
3811                 if (limit == 0 || outPos == outSize)
3812                         break;
3813                 zip->bcj_state = 1;
3814
3815                 b = buf0[inPos++];
3816
3817                 if (b == 0xE8)
3818                         prob = zip->bcj2_p + zip->bcj2_prevByte;
3819                 else if (b == 0xE9)
3820                         prob = zip->bcj2_p + 256;
3821                 else
3822                         prob = zip->bcj2_p + 257;
3823
3824                 IF_BIT_0(prob) {
3825                         UPDATE_0(prob)
3826                         zip->bcj2_prevByte = b;
3827                 } else {
3828                         uint32_t dest;
3829                         const uint8_t *v;
3830                         uint8_t out[4];
3831
3832                         UPDATE_1(prob)
3833                         if (b == 0xE8) {
3834                                 v = buf1;
3835                                 if (size1 < 4)
3836                                         return SZ_ERROR_DATA;
3837                                 buf1 += 4;
3838                                 size1 -= 4;
3839                         } else {
3840                                 v = buf2;
3841                                 if (size2 < 4)
3842                                         return SZ_ERROR_DATA;
3843                                 buf2 += 4;
3844                                 size2 -= 4;
3845                         }
3846                         dest = (((uint32_t)v[0] << 24) |
3847                             ((uint32_t)v[1] << 16) |
3848                             ((uint32_t)v[2] << 8) |
3849                             ((uint32_t)v[3])) -
3850                             ((uint32_t)zip->bcj2_outPos + (uint32_t)outPos + 4);
3851                         out[0] = (uint8_t)dest;
3852                         out[1] = (uint8_t)(dest >> 8);
3853                         out[2] = (uint8_t)(dest >> 16);
3854                         out[3] = zip->bcj2_prevByte = (uint8_t)(dest >> 24);
3855
3856                         for (i = 0; i < 4 && outPos < outSize; i++)
3857                                 outBuf[outPos++] = out[i];
3858                         if (i < 4) {
3859                                 /*
3860                                  * Save odd bytes which we could not add into
3861                                  * the output buffer because of out of space.
3862                                  */
3863                                 zip->odd_bcj_size = 4 -i;
3864                                 for (; i < 4; i++) {
3865                                         j = i - 4 + (unsigned)zip->odd_bcj_size;
3866                                         zip->odd_bcj[j] = out[i];
3867                                 }
3868                                 break;
3869                         }
3870                 }
3871         }
3872         zip->tmp_stream_bytes_remaining -= inPos;
3873         zip->sub_stream_bytes_remaining[0] = size1;
3874         zip->sub_stream_bytes_remaining[1] = size2;
3875         zip->sub_stream_bytes_remaining[2] = bufferLim - buffer;
3876         zip->bcj2_outPos += outPos;
3877
3878         return ((ssize_t)outPos);
3879 }
3880