contrib/libarchive/libarchive/archive_read_support_format_7zip.c

   1 /*-
   2  * Copyright (c) 2011 Michihiro NAKAJIMA
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "archive_platform.h"
  27 __FBSDID("$FreeBSD$");
  28
  29 #ifdef HAVE_ERRNO_H
  30 #include <errno.h>
  31 #endif
  32 #ifdef HAVE_STDLIB_H
  33 #include <stdlib.h>
  34 #endif
  35 #ifdef HAVE_BZLIB_H
  36 #include <bzlib.h>
  37 #endif
  38 #ifdef HAVE_LZMA_H
  39 #include <lzma.h>
  40 #endif
  41 #ifdef HAVE_ZLIB_H
  42 #include <zlib.h>
  43 #endif
  44
  45 #include "archive.h"
  46 #include "archive_entry.h"
  47 #include "archive_entry_locale.h"
  48 #include "archive_ppmd7_private.h"
  49 #include "archive_private.h"
  50 #include "archive_read_private.h"
  51 #include "archive_endian.h"
  52
  53 #ifndef HAVE_ZLIB_H
  54 #include "archive_crc32.h"
  55 #endif
  56
  57 #define _7ZIP_SIGNATURE "7z\xBC\xAF\x27\x1C"
  58 #define SFX_MIN_ADDR    0x27000
  59 #define SFX_MAX_ADDR    0x60000
  60
  61
  62 /*
  63  * Codec ID
  64  */
  65 #define _7Z_COPY        0
  66 #define _7Z_LZMA        0x030101
  67 #define _7Z_LZMA2       0x21
  68 #define _7Z_DEFLATE     0x040108
  69 #define _7Z_BZ2         0x040202
  70 #define _7Z_PPMD        0x030401
  71 #define _7Z_DELTA       0x03
  72 #define _7Z_CRYPTO_MAIN_ZIP                     0x06F10101 /* Main Zip crypto algo */
  73 #define _7Z_CRYPTO_RAR_29                       0x06F10303 /* Rar29 AES-128 + (modified SHA-1) */
  74 #define _7Z_CRYPTO_AES_256_SHA_256      0x06F10701 /* AES-256 + SHA-256 */
  75
  76
  77 #define _7Z_X86         0x03030103
  78 #define _7Z_X86_BCJ2    0x0303011B
  79 #define _7Z_POWERPC     0x03030205
  80 #define _7Z_IA64        0x03030401
  81 #define _7Z_ARM         0x03030501
  82 #define _7Z_ARMTHUMB    0x03030701
  83 #define _7Z_SPARC       0x03030805
  84
  85 /*
  86  * 7-Zip header property IDs.
  87  */
  88 #define kEnd                    0x00
  89 #define kHeader                 0x01
  90 #define kArchiveProperties      0x02
  91 #define kAdditionalStreamsInfo  0x03
  92 #define kMainStreamsInfo        0x04
  93 #define kFilesInfo              0x05
  94 #define kPackInfo               0x06
  95 #define kUnPackInfo             0x07
  96 #define kSubStreamsInfo         0x08
  97 #define kSize                   0x09
  98 #define kCRC                    0x0A
  99 #define kFolder                 0x0B
 100 #define kCodersUnPackSize       0x0C
 101 #define kNumUnPackStream        0x0D
 102 #define kEmptyStream            0x0E
 103 #define kEmptyFile              0x0F
 104 #define kAnti                   0x10
 105 #define kName                   0x11
 106 #define kCTime                  0x12
 107 #define kATime                  0x13
 108 #define kMTime                  0x14
 109 #define kAttributes             0x15
 110 #define kEncodedHeader          0x17
 111 #define kDummy                  0x19
 112
 113 struct _7z_digests {
 114         unsigned char   *defineds;
 115         uint32_t        *digests;
 116 };
 117
 118
 119 struct _7z_folder {
 120         uint64_t                 numCoders;
 121         struct _7z_coder {
 122                 unsigned long    codec;
 123                 uint64_t         numInStreams;
 124                 uint64_t         numOutStreams;
 125                 uint64_t         propertiesSize;
 126                 unsigned char   *properties;
 127         } *coders;
 128         uint64_t                 numBindPairs;
 129         struct {
 130                 uint64_t         inIndex;
 131                 uint64_t         outIndex;
 132         } *bindPairs;
 133         uint64_t                 numPackedStreams;
 134         uint64_t                *packedStreams;
 135         uint64_t                 numInStreams;
 136         uint64_t                 numOutStreams;
 137         uint64_t                *unPackSize;
 138         unsigned char            digest_defined;
 139         uint32_t                 digest;
 140         uint64_t                 numUnpackStreams;
 141         uint32_t                 packIndex;
 142         /* Unoperated bytes. */
 143         uint64_t                 skipped_bytes;
 144 };
 145
 146 struct _7z_coders_info {
 147         uint64_t                 numFolders;
 148         struct _7z_folder       *folders;
 149         uint64_t                 dataStreamIndex;
 150 };
 151
 152 struct _7z_pack_info {
 153         uint64_t                 pos;
 154         uint64_t                 numPackStreams;
 155         uint64_t                *sizes;
 156         struct _7z_digests       digest;
 157         /* Calculated from pos and numPackStreams. */
 158         uint64_t                *positions;
 159 };
 160
 161 struct _7z_substream_info {
 162         size_t                   unpack_streams;
 163         uint64_t                *unpackSizes;
 164         unsigned char           *digestsDefined;
 165         uint32_t                *digests;
 166 };
 167
 168 struct _7z_stream_info {
 169         struct _7z_pack_info     pi;
 170         struct _7z_coders_info   ci;
 171         struct _7z_substream_info ss;
 172 };
 173
 174 struct _7z_header_info {
 175         uint64_t                 dataIndex;
 176
 177         unsigned char           *emptyStreamBools;
 178         unsigned char           *emptyFileBools;
 179         unsigned char           *antiBools;
 180         unsigned char           *attrBools;
 181 };
 182
 183 struct _7zip_entry {
 184         size_t                   name_len;
 185         unsigned char           *utf16name;
 186 #if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG)
 187         const wchar_t           *wname;
 188 #endif
 189         uint32_t                 folderIndex;
 190         uint32_t                 ssIndex;
 191         unsigned                 flg;
 192 #define MTIME_IS_SET    (1<<0)
 193 #define ATIME_IS_SET    (1<<1)
 194 #define CTIME_IS_SET    (1<<2)
 195 #define CRC32_IS_SET    (1<<3)
 196 #define HAS_STREAM      (1<<4)
 197
 198         time_t                   mtime;
 199         time_t                   atime;
 200         time_t                   ctime;
 201         long                     mtime_ns;
 202         long                     atime_ns;
 203         long                     ctime_ns;
 204         uint32_t                 mode;
 205         uint32_t                 attr;
 206 };
 207
 208 struct _7zip {
 209         /* Structural information about the archive. */
 210         struct _7z_stream_info   si;
 211
 212         int                      header_is_being_read;
 213         int                      header_is_encoded;
 214         uint64_t                 header_bytes_remaining;
 215         unsigned long            header_crc32;
 216         /* Header offset to check that reading points of the file contents
 217          * will not exceed the header. */
 218         uint64_t                 header_offset;
 219         /* Base offset of the archive file for a seek in case reading SFX. */
 220         uint64_t                 seek_base;
 221
 222         /* List of entries */
 223         size_t                   entries_remaining;
 224         uint64_t                 numFiles;
 225         struct _7zip_entry      *entries;
 226         struct _7zip_entry      *entry;
 227         unsigned char           *entry_names;
 228
 229         /* entry_bytes_remaining is the number of bytes we expect. */
 230         int64_t                  entry_offset;
 231         uint64_t                 entry_bytes_remaining;
 232
 233         /* Running CRC32 of the decompressed data */
 234         unsigned long            entry_crc32;
 235
 236         /* Flags to mark progress of decompression. */
 237         char                     end_of_entry;
 238
 239         /* Uncompressed buffer control.  */
 240 #define UBUFF_SIZE      (64 * 1024)
 241         unsigned char           *uncompressed_buffer;
 242         unsigned char           *uncompressed_buffer_pointer;
 243         size_t                   uncompressed_buffer_size;
 244         size_t                   uncompressed_buffer_bytes_remaining;
 245
 246         /* Offset of the compressed data. */
 247         int64_t                  stream_offset;
 248
 249         /*
 250          * Decompressing control data.
 251          */
 252         unsigned                 folder_index;
 253         uint64_t                 folder_outbytes_remaining;
 254         unsigned                 pack_stream_index;
 255         unsigned                 pack_stream_remaining;
 256         uint64_t                 pack_stream_inbytes_remaining;
 257         size_t                   pack_stream_bytes_unconsumed;
 258
 259         /* The codec information of a folder. */
 260         unsigned long            codec;
 261         unsigned long            codec2;
 262
 263         /*
 264          * Decompressor controllers.
 265          */
 266         /* Decoding LZMA1 and LZMA2 data. */
 267 #ifdef HAVE_LZMA_H
 268         lzma_stream              lzstream;
 269         int                      lzstream_valid;
 270 #endif
 271         /* Decoding bzip2 data. */
 272 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
 273         bz_stream                bzstream;
 274         int                      bzstream_valid;
 275 #endif
 276         /* Decoding deflate data. */
 277 #ifdef HAVE_ZLIB_H
 278         z_stream                 stream;
 279         int                      stream_valid;
 280 #endif
 281         /* Decoding PPMd data. */
 282         int                      ppmd7_stat;
 283         CPpmd7                   ppmd7_context;
 284         CPpmd7z_RangeDec         range_dec;
 285         IByteIn                  bytein;
 286         struct {
 287                 const unsigned char     *next_in;
 288                 int64_t                  avail_in;
 289                 int64_t                  total_in;
 290                 unsigned char           *next_out;
 291                 int64_t                  avail_out;
 292                 int64_t                  total_out;
 293                 int                      overconsumed;
 294         } ppstream;
 295         int                      ppmd7_valid;
 296
 297         /* Decoding BCJ and BCJ2 data. */
 298         uint32_t                 bcj_state;
 299         size_t                   odd_bcj_size;
 300         unsigned char            odd_bcj[4];
 301         /* Decoding BCJ data. */
 302         size_t                   bcj_prevPosT;
 303         uint32_t                 bcj_prevMask;
 304         uint32_t                 bcj_ip;
 305
 306         /* Decoding BCJ2 data. */
 307         size_t                   main_stream_bytes_remaining;
 308         unsigned char           *sub_stream_buff[3];
 309         size_t                   sub_stream_size[3];
 310         size_t                   sub_stream_bytes_remaining[3];
 311         unsigned char           *tmp_stream_buff;
 312         size_t                   tmp_stream_buff_size;
 313         size_t                   tmp_stream_bytes_avail;
 314         size_t                   tmp_stream_bytes_remaining;
 315 #ifdef _LZMA_PROB32
 316 #define CProb uint32_t
 317 #else
 318 #define CProb uint16_t
 319 #endif
 320         CProb                    bcj2_p[256 + 2];
 321         uint8_t                  bcj2_prevByte;
 322         uint32_t                 bcj2_range;
 323         uint32_t                 bcj2_code;
 324         uint64_t                 bcj2_outPos;
 325
 326         /* Filename character-set conversion data. */
 327         struct archive_string_conv *sconv;
 328
 329         char                     format_name[64];
 330
 331         /* Custom value that is non-zero if this archive contains encrypted entries. */
 332         int                      has_encrypted_entries;
 333 };
 334
 335 /* Maximum entry size. This limitation prevents reading intentional
 336  * corrupted 7-zip files on assuming there are not so many entries in
 337  * the files. */
 338 #define UMAX_ENTRY      ARCHIVE_LITERAL_ULL(100000000)
 339
 340 static int      archive_read_format_7zip_has_encrypted_entries(struct archive_read *);
 341 static int      archive_read_support_format_7zip_capabilities(struct archive_read *a);
 342 static int      archive_read_format_7zip_bid(struct archive_read *, int);
 343 static int      archive_read_format_7zip_cleanup(struct archive_read *);
 344 static int      archive_read_format_7zip_read_data(struct archive_read *,
 345                     const void **, size_t *, int64_t *);
 346 static int      archive_read_format_7zip_read_data_skip(struct archive_read *);
 347 static int      archive_read_format_7zip_read_header(struct archive_read *,
 348                     struct archive_entry *);
 349 static int      check_7zip_header_in_sfx(const char *);
 350 static unsigned long decode_codec_id(const unsigned char *, size_t);
 351 static int      decode_encoded_header_info(struct archive_read *,
 352                     struct _7z_stream_info *);
 353 static int      decompress(struct archive_read *, struct _7zip *,
 354                     void *, size_t *, const void *, size_t *);
 355 static ssize_t  extract_pack_stream(struct archive_read *, size_t);
 356 static void     fileTimeToUtc(uint64_t, time_t *, long *);
 357 static uint64_t folder_uncompressed_size(struct _7z_folder *);
 358 static void     free_CodersInfo(struct _7z_coders_info *);
 359 static void     free_Digest(struct _7z_digests *);
 360 static void     free_Folder(struct _7z_folder *);
 361 static void     free_Header(struct _7z_header_info *);
 362 static void     free_PackInfo(struct _7z_pack_info *);
 363 static void     free_StreamsInfo(struct _7z_stream_info *);
 364 static void     free_SubStreamsInfo(struct _7z_substream_info *);
 365 static int      free_decompression(struct archive_read *, struct _7zip *);
 366 static ssize_t  get_uncompressed_data(struct archive_read *, const void **,
 367                     size_t, size_t);
 368 static const unsigned char * header_bytes(struct archive_read *, size_t);
 369 static int      init_decompression(struct archive_read *, struct _7zip *,
 370                     const struct _7z_coder *, const struct _7z_coder *);
 371 static int      parse_7zip_uint64(struct archive_read *, uint64_t *);
 372 static int      read_Bools(struct archive_read *, unsigned char *, size_t);
 373 static int      read_CodersInfo(struct archive_read *,
 374                     struct _7z_coders_info *);
 375 static int      read_Digests(struct archive_read *, struct _7z_digests *,
 376                     size_t);
 377 static int      read_Folder(struct archive_read *, struct _7z_folder *);
 378 static int      read_Header(struct archive_read *, struct _7z_header_info *,
 379                     int);
 380 static int      read_PackInfo(struct archive_read *, struct _7z_pack_info *);
 381 static int      read_StreamsInfo(struct archive_read *,
 382                     struct _7z_stream_info *);
 383 static int      read_SubStreamsInfo(struct archive_read *,
 384                     struct _7z_substream_info *, struct _7z_folder *, size_t);
 385 static int      read_Times(struct archive_read *, struct _7z_header_info *,
 386                     int);
 387 static void     read_consume(struct archive_read *);
 388 static ssize_t  read_stream(struct archive_read *, const void **, size_t,
 389                     size_t);
 390 static int      seek_pack(struct archive_read *);
 391 static int64_t  skip_stream(struct archive_read *, size_t);
 392 static int      skip_sfx(struct archive_read *, ssize_t);
 393 static int      slurp_central_directory(struct archive_read *, struct _7zip *,
 394                     struct _7z_header_info *);
 395 static int      setup_decode_folder(struct archive_read *, struct _7z_folder *,
 396                     int);
 397 static void     x86_Init(struct _7zip *);
 398 static size_t   x86_Convert(struct _7zip *, uint8_t *, size_t);
 399 static ssize_t          Bcj2_Decode(struct _7zip *, uint8_t *, size_t);
 400
 401
 402 int
 403 archive_read_support_format_7zip(struct archive *_a)
 404 {
 405         struct archive_read *a = (struct archive_read *)_a;
 406         struct _7zip *zip;
 407         int r;
 408
 409         archive_check_magic(_a, ARCHIVE_READ_MAGIC,
 410             ARCHIVE_STATE_NEW, "archive_read_support_format_7zip");
 411
 412         zip = calloc(1, sizeof(*zip));
 413         if (zip == NULL) {
 414                 archive_set_error(&a->archive, ENOMEM,
 415                     "Can't allocate 7zip data");
 416                 return (ARCHIVE_FATAL);
 417         }
 418
 419         /*
 420          * Until enough data has been read, we cannot tell about
 421          * any encrypted entries yet.
 422          */
 423         zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
 424
 425
 426         r = __archive_read_register_format(a,
 427             zip,
 428             "7zip",
 429             archive_read_format_7zip_bid,
 430             NULL,
 431             archive_read_format_7zip_read_header,
 432             archive_read_format_7zip_read_data,
 433             archive_read_format_7zip_read_data_skip,
 434             NULL,
 435             archive_read_format_7zip_cleanup,
 436             archive_read_support_format_7zip_capabilities,
 437             archive_read_format_7zip_has_encrypted_entries);
 438
 439         if (r != ARCHIVE_OK)
 440                 free(zip);
 441         return (ARCHIVE_OK);
 442 }
 443
 444 static int
 445 archive_read_support_format_7zip_capabilities(struct archive_read * a)
 446 {
 447         (void)a; /* UNUSED */
 448         return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
 449                         ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
 450 }
 451
 452
 453 static int
 454 archive_read_format_7zip_has_encrypted_entries(struct archive_read *_a)
 455 {
 456         if (_a && _a->format) {
 457                 struct _7zip * zip = (struct _7zip *)_a->format->data;
 458                 if (zip) {
 459                         return zip->has_encrypted_entries;
 460                 }
 461         }
 462         return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
 463 }
 464
 465 static int
 466 archive_read_format_7zip_bid(struct archive_read *a, int best_bid)
 467 {
 468         const char *p;
 469
 470         /* If someone has already bid more than 32, then avoid
 471            trashing the look-ahead buffers with a seek. */
 472         if (best_bid > 32)
 473                 return (-1);
 474
 475         if ((p = __archive_read_ahead(a, 6, NULL)) == NULL)
 476                 return (0);
 477
 478         /* If first six bytes are the 7-Zip signature,
 479          * return the bid right now. */
 480         if (memcmp(p, _7ZIP_SIGNATURE, 6) == 0)
 481                 return (48);
 482
 483         /*
 484          * It may a 7-Zip SFX archive file. If first two bytes are
 485          * 'M' and 'Z' available on Windows or first four bytes are
 486          * "\x7F\x45LF" available on posix like system, seek the 7-Zip
 487          * signature. Although we will perform a seek when reading
 488          * a header, what we do not use __archive_read_seek() here is
 489          * due to a bidding performance.
 490          */
 491         if ((p[0] == 'M' && p[1] == 'Z') || memcmp(p, "\x7F\x45LF", 4) == 0) {
 492                 ssize_t offset = SFX_MIN_ADDR;
 493                 ssize_t window = 4096;
 494                 ssize_t bytes_avail;
 495                 while (offset + window <= (SFX_MAX_ADDR)) {
 496                         const char *buff = __archive_read_ahead(a,
 497                                         offset + window, &bytes_avail);
 498                         if (buff == NULL) {
 499                                 /* Remaining bytes are less than window. */
 500                                 window >>= 1;
 501                                 if (window < 0x40)
 502                                         return (0);
 503                                 continue;
 504                         }
 505                         p = buff + offset;
 506                         while (p + 32 < buff + bytes_avail) {
 507                                 int step = check_7zip_header_in_sfx(p);
 508                                 if (step == 0)
 509                                         return (48);
 510                                 p += step;
 511                         }
 512                         offset = p - buff;
 513                 }
 514         }
 515         return (0);
 516 }
 517
 518 static int
 519 check_7zip_header_in_sfx(const char *p)
 520 {
 521         switch ((unsigned char)p[5]) {
 522         case 0x1C:
 523                 if (memcmp(p, _7ZIP_SIGNATURE, 6) != 0)
 524                         return (6);
 525                 /*
 526                  * Test the CRC because its extraction code has 7-Zip
 527                  * Magic Code, so we should do this in order not to
 528                  * make a mis-detection.
 529                  */
 530                 if (crc32(0, (const unsigned char *)p + 12, 20)
 531                         != archive_le32dec(p + 8))
 532                         return (6);
 533                 /* Hit the header! */
 534                 return (0);
 535         case 0x37: return (5);
 536         case 0x7A: return (4);
 537         case 0xBC: return (3);
 538         case 0xAF: return (2);
 539         case 0x27: return (1);
 540         default: return (6);
 541         }
 542 }
 543
 544 static int
 545 skip_sfx(struct archive_read *a, ssize_t bytes_avail)
 546 {
 547         const void *h;
 548         const char *p, *q;
 549         size_t skip, offset;
 550         ssize_t bytes, window;
 551
 552         /*
 553          * If bytes_avail > SFX_MIN_ADDR we do not have to call
 554          * __archive_read_seek() at this time since we have
 555          * already had enough data.
 556          */
 557         if (bytes_avail > SFX_MIN_ADDR)
 558                 __archive_read_consume(a, SFX_MIN_ADDR);
 559         else if (__archive_read_seek(a, SFX_MIN_ADDR, SEEK_SET) < 0)
 560                 return (ARCHIVE_FATAL);
 561
 562         offset = 0;
 563         window = 1;
 564         while (offset + window <= SFX_MAX_ADDR - SFX_MIN_ADDR) {
 565                 h = __archive_read_ahead(a, window, &bytes);
 566                 if (h == NULL) {
 567                         /* Remaining bytes are less than window. */
 568                         window >>= 1;
 569                         if (window < 0x40)
 570                                 goto fatal;
 571                         continue;
 572                 }
 573                 if (bytes < 6) {
 574                         /* This case might happen when window == 1. */
 575                         window = 4096;
 576                         continue;
 577                 }
 578                 p = (const char *)h;
 579                 q = p + bytes;
 580
 581                 /*
 582                  * Scan ahead until we find something that looks
 583                  * like the 7-Zip header.
 584                  */
 585                 while (p + 32 < q) {
 586                         int step = check_7zip_header_in_sfx(p);
 587                         if (step == 0) {
 588                                 struct _7zip *zip =
 589                                     (struct _7zip *)a->format->data;
 590                                 skip = p - (const char *)h;
 591                                 __archive_read_consume(a, skip);
 592                                 zip->seek_base = SFX_MIN_ADDR + offset + skip;
 593                                 return (ARCHIVE_OK);
 594                         }
 595                         p += step;
 596                 }
 597                 skip = p - (const char *)h;
 598                 __archive_read_consume(a, skip);
 599                 offset += skip;
 600                 if (window == 1)
 601                         window = 4096;
 602         }
 603 fatal:
 604         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 605             "Couldn't find out 7-Zip header");
 606         return (ARCHIVE_FATAL);
 607 }
 608
 609 static int
 610 archive_read_format_7zip_read_header(struct archive_read *a,
 611         struct archive_entry *entry)
 612 {
 613         struct _7zip *zip = (struct _7zip *)a->format->data;
 614         struct _7zip_entry *zip_entry;
 615         int r, ret = ARCHIVE_OK;
 616         struct _7z_folder *folder = 0;
 617         uint64_t fidx = 0;
 618
 619         /*
 620          * It should be sufficient to call archive_read_next_header() for
 621          * a reader to determine if an entry is encrypted or not. If the
 622          * encryption of an entry is only detectable when calling
 623          * archive_read_data(), so be it. We'll do the same check there
 624          * as well.
 625          */
 626         if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
 627                 zip->has_encrypted_entries = 0;
 628         }
 629
 630         a->archive.archive_format = ARCHIVE_FORMAT_7ZIP;
 631         if (a->archive.archive_format_name == NULL)
 632                 a->archive.archive_format_name = "7-Zip";
 633
 634         if (zip->entries == NULL) {
 635                 struct _7z_header_info header;
 636
 637                 memset(&header, 0, sizeof(header));
 638                 r = slurp_central_directory(a, zip, &header);
 639                 free_Header(&header);
 640                 if (r != ARCHIVE_OK)
 641                         return (r);
 642                 zip->entries_remaining = (size_t)zip->numFiles;
 643                 zip->entry = zip->entries;
 644         } else {
 645                 ++zip->entry;
 646         }
 647         zip_entry = zip->entry;
 648
 649         if (zip->entries_remaining <= 0 || zip_entry == NULL)
 650                 return ARCHIVE_EOF;
 651         --zip->entries_remaining;
 652
 653         zip->entry_offset = 0;
 654         zip->end_of_entry = 0;
 655         zip->entry_crc32 = crc32(0, NULL, 0);
 656
 657         /* Setup a string conversion for a filename. */
 658         if (zip->sconv == NULL) {
 659                 zip->sconv = archive_string_conversion_from_charset(
 660                     &a->archive, "UTF-16LE", 1);
 661                 if (zip->sconv == NULL)
 662                         return (ARCHIVE_FATAL);
 663         }
 664
 665         /* Figure out if the entry is encrypted by looking at the folder
 666            that is associated to the current 7zip entry. If the folder
 667            has a coder with a _7Z_CRYPTO codec then the folder is encrypted.
 668            Hence the entry must also be encrypted. */
 669         if (zip_entry && zip_entry->folderIndex < zip->si.ci.numFolders) {
 670                 folder = &(zip->si.ci.folders[zip_entry->folderIndex]);
 671                 for (fidx=0; folder && fidx<folder->numCoders; fidx++) {
 672                         switch(folder->coders[fidx].codec) {
 673                                 case _7Z_CRYPTO_MAIN_ZIP:
 674                                 case _7Z_CRYPTO_RAR_29:
 675                                 case _7Z_CRYPTO_AES_256_SHA_256: {
 676                                         archive_entry_set_is_data_encrypted(entry, 1);
 677                                         zip->has_encrypted_entries = 1;
 678                                         break;
 679                                 }
 680                         }
 681                 }
 682         }
 683
 684         /* Now that we've checked for encryption, if there were still no
 685          * encrypted entries found we can say for sure that there are none.
 686          */
 687         if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
 688                 zip->has_encrypted_entries = 0;
 689         }
 690
 691         if (archive_entry_copy_pathname_l(entry,
 692             (const char *)zip_entry->utf16name,
 693             zip_entry->name_len, zip->sconv) != 0) {
 694                 if (errno == ENOMEM) {
 695                         archive_set_error(&a->archive, ENOMEM,
 696                             "Can't allocate memory for Pathname");
 697                         return (ARCHIVE_FATAL);
 698                 }
 699                 archive_set_error(&a->archive,
 700                     ARCHIVE_ERRNO_FILE_FORMAT,
 701                     "Pathname cannot be converted "
 702                     "from %s to current locale.",
 703                     archive_string_conversion_charset_name(zip->sconv));
 704                 ret = ARCHIVE_WARN;
 705         }
 706
 707         /* Populate some additional entry fields: */
 708         archive_entry_set_mode(entry, zip_entry->mode);
 709         if (zip_entry->flg & MTIME_IS_SET)
 710                 archive_entry_set_mtime(entry, zip_entry->mtime,
 711                         zip_entry->mtime_ns);
 712         if (zip_entry->flg & CTIME_IS_SET)
 713                 archive_entry_set_ctime(entry, zip_entry->ctime,
 714                     zip_entry->ctime_ns);
 715         if (zip_entry->flg & ATIME_IS_SET)
 716                 archive_entry_set_atime(entry, zip_entry->atime,
 717                     zip_entry->atime_ns);
 718         if (zip_entry->ssIndex != (uint32_t)-1) {
 719                 zip->entry_bytes_remaining =
 720                     zip->si.ss.unpackSizes[zip_entry->ssIndex];
 721                 archive_entry_set_size(entry, zip->entry_bytes_remaining);
 722         } else {
 723                 zip->entry_bytes_remaining = 0;
 724                 archive_entry_set_size(entry, 0);
 725         }
 726
 727         /* If there's no body, force read_data() to return EOF immediately. */
 728         if (zip->entry_bytes_remaining < 1)
 729                 zip->end_of_entry = 1;
 730
 731         if ((zip_entry->mode & AE_IFMT) == AE_IFLNK) {
 732                 unsigned char *symname = NULL;
 733                 size_t symsize = 0;
 734
 735                 /*
 736                  * Symbolic-name is recorded as its contents. We have to
 737                  * read the contents at this time.
 738                  */
 739                 while (zip->entry_bytes_remaining > 0) {
 740                         const void *buff;
 741                         unsigned char *mem;
 742                         size_t size;
 743                         int64_t offset;
 744
 745                         r = archive_read_format_7zip_read_data(a, &buff,
 746                                 &size, &offset);
 747                         if (r < ARCHIVE_WARN) {
 748                                 free(symname);
 749                                 return (r);
 750                         }
 751                         mem = realloc(symname, symsize + size + 1);
 752                         if (mem == NULL) {
 753                                 free(symname);
 754                                 archive_set_error(&a->archive, ENOMEM,
 755                                     "Can't allocate memory for Symname");
 756                                 return (ARCHIVE_FATAL);
 757                         }
 758                         symname = mem;
 759                         memcpy(symname+symsize, buff, size);
 760                         symsize += size;
 761                 }
 762                 if (symsize == 0) {
 763                         /* If there is no symname, handle it as a regular
 764                          * file. */
 765                         zip_entry->mode &= ~AE_IFMT;
 766                         zip_entry->mode |= AE_IFREG;
 767                         archive_entry_set_mode(entry, zip_entry->mode);
 768                 } else {
 769                         symname[symsize] = '\0';
 770                         archive_entry_copy_symlink(entry,
 771                             (const char *)symname);
 772                 }
 773                 free(symname);
 774                 archive_entry_set_size(entry, 0);
 775         }
 776
 777         /* Set up a more descriptive format name. */
 778         sprintf(zip->format_name, "7-Zip");
 779         a->archive.archive_format_name = zip->format_name;
 780
 781         return (ret);
 782 }
 783
 784 static int
 785 archive_read_format_7zip_read_data(struct archive_read *a,
 786     const void **buff, size_t *size, int64_t *offset)
 787 {
 788         struct _7zip *zip;
 789         ssize_t bytes;
 790         int ret = ARCHIVE_OK;
 791
 792         zip = (struct _7zip *)(a->format->data);
 793
 794         if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
 795                 zip->has_encrypted_entries = 0;
 796         }
 797
 798         if (zip->pack_stream_bytes_unconsumed)
 799                 read_consume(a);
 800
 801         *offset = zip->entry_offset;
 802         *size = 0;
 803         *buff = NULL;
 804         /*
 805          * If we hit end-of-entry last time, clean up and return
 806          * ARCHIVE_EOF this time.
 807          */
 808         if (zip->end_of_entry)
 809                 return (ARCHIVE_EOF);
 810
 811         bytes = read_stream(a, buff,
 812                 (size_t)zip->entry_bytes_remaining, 0);
 813         if (bytes < 0)
 814                 return ((int)bytes);
 815         if (bytes == 0) {
 816                 archive_set_error(&a->archive,
 817                     ARCHIVE_ERRNO_FILE_FORMAT,
 818                     "Truncated 7-Zip file body");
 819                 return (ARCHIVE_FATAL);
 820         }
 821         zip->entry_bytes_remaining -= bytes;
 822         if (zip->entry_bytes_remaining == 0)
 823                 zip->end_of_entry = 1;
 824
 825         /* Update checksum */
 826         if ((zip->entry->flg & CRC32_IS_SET) && bytes)
 827                 zip->entry_crc32 = crc32(zip->entry_crc32, *buff,
 828                     (unsigned)bytes);
 829
 830         /* If we hit the end, swallow any end-of-data marker. */
 831         if (zip->end_of_entry) {
 832                 /* Check computed CRC against file contents. */
 833                 if ((zip->entry->flg & CRC32_IS_SET) &&
 834                         zip->si.ss.digests[zip->entry->ssIndex] !=
 835                     zip->entry_crc32) {
 836                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 837                             "7-Zip bad CRC: 0x%lx should be 0x%lx",
 838                             (unsigned long)zip->entry_crc32,
 839                             (unsigned long)zip->si.ss.digests[
 840                                         zip->entry->ssIndex]);
 841                         ret = ARCHIVE_WARN;
 842                 }
 843         }
 844
 845         *size = bytes;
 846         *offset = zip->entry_offset;
 847         zip->entry_offset += bytes;
 848
 849         return (ret);
 850 }
 851
 852 static int
 853 archive_read_format_7zip_read_data_skip(struct archive_read *a)
 854 {
 855         struct _7zip *zip;
 856         int64_t bytes_skipped;
 857
 858         zip = (struct _7zip *)(a->format->data);
 859
 860         if (zip->pack_stream_bytes_unconsumed)
 861                 read_consume(a);
 862
 863         /* If we've already read to end of data, we're done. */
 864         if (zip->end_of_entry)
 865                 return (ARCHIVE_OK);
 866
 867         /*
 868          * If the length is at the beginning, we can skip the
 869          * compressed data much more quickly.
 870          */
 871         bytes_skipped = skip_stream(a, (size_t)zip->entry_bytes_remaining);
 872         if (bytes_skipped < 0)
 873                 return (ARCHIVE_FATAL);
 874         zip->entry_bytes_remaining = 0;
 875
 876         /* This entry is finished and done. */
 877         zip->end_of_entry = 1;
 878         return (ARCHIVE_OK);
 879 }
 880
 881 static int
 882 archive_read_format_7zip_cleanup(struct archive_read *a)
 883 {
 884         struct _7zip *zip;
 885
 886         zip = (struct _7zip *)(a->format->data);
 887         free_StreamsInfo(&(zip->si));
 888         free(zip->entries);
 889         free(zip->entry_names);
 890         free_decompression(a, zip);
 891         free(zip->uncompressed_buffer);
 892         free(zip->sub_stream_buff[0]);
 893         free(zip->sub_stream_buff[1]);
 894         free(zip->sub_stream_buff[2]);
 895         free(zip->tmp_stream_buff);
 896         free(zip);
 897         (a->format->data) = NULL;
 898         return (ARCHIVE_OK);
 899 }
 900
 901 static void
 902 read_consume(struct archive_read *a)
 903 {
 904         struct _7zip *zip = (struct _7zip *)a->format->data;
 905
 906         if (zip->pack_stream_bytes_unconsumed) {
 907                 __archive_read_consume(a, zip->pack_stream_bytes_unconsumed);
 908                 zip->stream_offset += zip->pack_stream_bytes_unconsumed;
 909                 zip->pack_stream_bytes_unconsumed = 0;
 910         }
 911 }
 912
 913 #ifdef HAVE_LZMA_H
 914
 915 /*
 916  * Set an error code and choose an error message for liblzma.
 917  */
 918 static void
 919 set_error(struct archive_read *a, int ret)
 920 {
 921
 922         switch (ret) {
 923         case LZMA_STREAM_END: /* Found end of stream. */
 924         case LZMA_OK: /* Decompressor made some progress. */
 925                 break;
 926         case LZMA_MEM_ERROR:
 927                 archive_set_error(&a->archive, ENOMEM,
 928                     "Lzma library error: Cannot allocate memory");
 929                 break;
 930         case LZMA_MEMLIMIT_ERROR:
 931                 archive_set_error(&a->archive, ENOMEM,
 932                     "Lzma library error: Out of memory");
 933                 break;
 934         case LZMA_FORMAT_ERROR:
 935                 archive_set_error(&a->archive,
 936                     ARCHIVE_ERRNO_MISC,
 937                     "Lzma library error: format not recognized");
 938                 break;
 939         case LZMA_OPTIONS_ERROR:
 940                 archive_set_error(&a->archive,
 941                     ARCHIVE_ERRNO_MISC,
 942                     "Lzma library error: Invalid options");
 943                 break;
 944         case LZMA_DATA_ERROR:
 945                 archive_set_error(&a->archive,
 946                     ARCHIVE_ERRNO_MISC,
 947                     "Lzma library error: Corrupted input data");
 948                 break;
 949         case LZMA_BUF_ERROR:
 950                 archive_set_error(&a->archive,
 951                     ARCHIVE_ERRNO_MISC,
 952                     "Lzma library error:  No progress is possible");
 953                 break;
 954         default:
 955                 /* Return an error. */
 956                 archive_set_error(&a->archive,
 957                     ARCHIVE_ERRNO_MISC,
 958                     "Lzma decompression failed:  Unknown error");
 959                 break;
 960         }
 961 }
 962
 963 #endif
 964
 965 static unsigned long
 966 decode_codec_id(const unsigned char *codecId, size_t id_size)
 967 {
 968         unsigned i;
 969         unsigned long id = 0;
 970
 971         for (i = 0; i < id_size; i++) {
 972                 id <<= 8;
 973                 id += codecId[i];
 974         }
 975         return (id);
 976 }
 977
 978 static Byte
 979 ppmd_read(void *p)
 980 {
 981         struct archive_read *a = ((IByteIn*)p)->a;
 982         struct _7zip *zip = (struct _7zip *)(a->format->data);
 983         Byte b;
 984
 985         if (zip->ppstream.avail_in == 0) {
 986                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 987                     "Truncated RAR file data");
 988                 zip->ppstream.overconsumed = 1;
 989                 return (0);
 990         }
 991         b = *zip->ppstream.next_in++;
 992         zip->ppstream.avail_in--;
 993         zip->ppstream.total_in++;
 994         return (b);
 995 }
 996
 997 static int
 998 init_decompression(struct archive_read *a, struct _7zip *zip,
 999     const struct _7z_coder *coder1, const struct _7z_coder *coder2)
1000 {
1001         int r;
1002
1003         zip->codec = coder1->codec;
1004         zip->codec2 = -1;
1005
1006         switch (zip->codec) {
1007         case _7Z_COPY:
1008         case _7Z_BZ2:
1009         case _7Z_DEFLATE:
1010         case _7Z_PPMD:
1011                 if (coder2 != NULL) {
1012                         if (coder2->codec != _7Z_X86 &&
1013                             coder2->codec != _7Z_X86_BCJ2) {
1014                                 archive_set_error(&a->archive,
1015                                     ARCHIVE_ERRNO_MISC,
1016                                     "Unsupported filter %lx for %lx",
1017                                     coder2->codec, coder1->codec);
1018                                 return (ARCHIVE_FAILED);
1019                         }
1020                         zip->codec2 = coder2->codec;
1021                         zip->bcj_state = 0;
1022                         if (coder2->codec == _7Z_X86)
1023                                 x86_Init(zip);
1024                 }
1025                 break;
1026         default:
1027                 break;
1028         }
1029
1030         switch (zip->codec) {
1031         case _7Z_COPY:
1032                 break;
1033
1034         case _7Z_LZMA: case _7Z_LZMA2:
1035 #ifdef HAVE_LZMA_H
1036 #if LZMA_VERSION_MAJOR >= 5
1037 /* Effectively disable the limiter. */
1038 #define LZMA_MEMLIMIT   UINT64_MAX
1039 #else
1040 /* NOTE: This needs to check memory size which running system has. */
1041 #define LZMA_MEMLIMIT   (1U << 30)
1042 #endif
1043         {
1044                 lzma_options_delta delta_opt;
1045                 lzma_filter filters[LZMA_FILTERS_MAX], *ff;
1046                 int fi = 0;
1047
1048                 if (zip->lzstream_valid) {
1049                         lzma_end(&(zip->lzstream));
1050                         zip->lzstream_valid = 0;
1051                 }
1052
1053                 /*
1054                  * NOTE: liblzma incompletely handle the BCJ+LZMA compressed
1055                  * data made by 7-Zip because 7-Zip does not add End-Of-
1056                  * Payload Marker(EOPM) at the end of LZMA compressed data,
1057                  * and so liblzma cannot know the end of the compressed data
1058                  * without EOPM. So consequently liblzma will not return last
1059                  * three or four bytes of uncompressed data because
1060                  * LZMA_FILTER_X86 filter does not handle input data if its
1061                  * data size is less than five bytes. If liblzma detect EOPM
1062                  * or know the uncompressed data size, liblzma will flush out
1063                  * the remaining that three or four bytes of uncompressed
1064                  * data. That is why we have to use our converting program
1065                  * for BCJ+LZMA. If we were able to tell the uncompressed
1066                  * size to liblzma when using lzma_raw_decoder() liblzma
1067                  * could correctly deal with BCJ+LZMA. But unfortunately
1068                  * there is no way to do that.
1069                  * Discussion about this can be found at XZ Utils forum.
1070                  */
1071                 if (coder2 != NULL) {
1072                         zip->codec2 = coder2->codec;
1073
1074                         filters[fi].options = NULL;
1075                         switch (zip->codec2) {
1076                         case _7Z_X86:
1077                                 if (zip->codec == _7Z_LZMA2) {
1078                                         filters[fi].id = LZMA_FILTER_X86;
1079                                         fi++;
1080                                 } else
1081                                         /* Use our filter. */
1082                                         x86_Init(zip);
1083                                 break;
1084                         case _7Z_X86_BCJ2:
1085                                 /* Use our filter. */
1086                                 zip->bcj_state = 0;
1087                                 break;
1088                         case _7Z_DELTA:
1089                                 if (coder2->propertiesSize != 1) {
1090                                         archive_set_error(&a->archive,
1091                                             ARCHIVE_ERRNO_MISC,
1092                                             "Invalid Delta parameter");
1093                                         return (ARCHIVE_FAILED);
1094                                 }
1095                                 filters[fi].id = LZMA_FILTER_DELTA;
1096                                 memset(&delta_opt, 0, sizeof(delta_opt));
1097                                 delta_opt.type = LZMA_DELTA_TYPE_BYTE;
1098                                 delta_opt.dist =
1099                                     (uint32_t)coder2->properties[0] + 1;
1100                                 filters[fi].options = &delta_opt;
1101                                 fi++;
1102                                 break;
1103                         /* Following filters have not been tested yet. */
1104                         case _7Z_POWERPC:
1105                                 filters[fi].id = LZMA_FILTER_POWERPC;
1106                                 fi++;
1107                                 break;
1108                         case _7Z_IA64:
1109                                 filters[fi].id = LZMA_FILTER_IA64;
1110                                 fi++;
1111                                 break;
1112                         case _7Z_ARM:
1113                                 filters[fi].id = LZMA_FILTER_ARM;
1114                                 fi++;
1115                                 break;
1116                         case _7Z_ARMTHUMB:
1117                                 filters[fi].id = LZMA_FILTER_ARMTHUMB;
1118                                 fi++;
1119                                 break;
1120                         case _7Z_SPARC:
1121                                 filters[fi].id = LZMA_FILTER_SPARC;
1122                                 fi++;
1123                                 break;
1124                         default:
1125                                 archive_set_error(&a->archive,
1126                                     ARCHIVE_ERRNO_MISC,
1127                                     "Unexpected codec ID: %lX", zip->codec2);
1128                                 return (ARCHIVE_FAILED);
1129                         }
1130                 }
1131
1132                 if (zip->codec == _7Z_LZMA2)
1133                         filters[fi].id = LZMA_FILTER_LZMA2;
1134                 else
1135                         filters[fi].id = LZMA_FILTER_LZMA1;
1136                 filters[fi].options = NULL;
1137                 ff = &filters[fi];
1138                 r = lzma_properties_decode(&filters[fi], NULL,
1139                     coder1->properties, (size_t)coder1->propertiesSize);
1140                 if (r != LZMA_OK) {
1141                         set_error(a, r);
1142                         return (ARCHIVE_FAILED);
1143                 }
1144                 fi++;
1145
1146                 filters[fi].id = LZMA_VLI_UNKNOWN;
1147                 filters[fi].options = NULL;
1148                 r = lzma_raw_decoder(&(zip->lzstream), filters);
1149                 free(ff->options);
1150                 if (r != LZMA_OK) {
1151                         set_error(a, r);
1152                         return (ARCHIVE_FAILED);
1153                 }
1154                 zip->lzstream_valid = 1;
1155                 zip->lzstream.total_in = 0;
1156                 zip->lzstream.total_out = 0;
1157                 break;
1158         }
1159 #else
1160                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1161                     "LZMA codec is unsupported");
1162                 return (ARCHIVE_FAILED);
1163 #endif
1164         case _7Z_BZ2:
1165 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
1166                 if (zip->bzstream_valid) {
1167                         BZ2_bzDecompressEnd(&(zip->bzstream));
1168                         zip->bzstream_valid = 0;
1169                 }
1170                 r = BZ2_bzDecompressInit(&(zip->bzstream), 0, 0);
1171                 if (r == BZ_MEM_ERROR)
1172                         r = BZ2_bzDecompressInit(&(zip->bzstream), 0, 1);
1173                 if (r != BZ_OK) {
1174                         int err = ARCHIVE_ERRNO_MISC;
1175                         const char *detail = NULL;
1176                         switch (r) {
1177                         case BZ_PARAM_ERROR:
1178                                 detail = "invalid setup parameter";
1179                                 break;
1180                         case BZ_MEM_ERROR:
1181                                 err = ENOMEM;
1182                                 detail = "out of memory";
1183                                 break;
1184                         case BZ_CONFIG_ERROR:
1185                                 detail = "mis-compiled library";
1186                                 break;
1187                         }
1188                         archive_set_error(&a->archive, err,
1189                             "Internal error initializing decompressor: %s",
1190                             detail != NULL ? detail : "??");
1191                         zip->bzstream_valid = 0;
1192                         return (ARCHIVE_FAILED);
1193                 }
1194                 zip->bzstream_valid = 1;
1195                 zip->bzstream.total_in_lo32 = 0;
1196                 zip->bzstream.total_in_hi32 = 0;
1197                 zip->bzstream.total_out_lo32 = 0;
1198                 zip->bzstream.total_out_hi32 = 0;
1199                 break;
1200 #else
1201                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1202                     "BZ2 codec is unsupported");
1203                 return (ARCHIVE_FAILED);
1204 #endif
1205         case _7Z_DEFLATE:
1206 #ifdef HAVE_ZLIB_H
1207                 if (zip->stream_valid)
1208                         r = inflateReset(&(zip->stream));
1209                 else
1210                         r = inflateInit2(&(zip->stream),
1211                             -15 /* Don't check for zlib header */);
1212                 if (r != Z_OK) {
1213                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1214                             "Couldn't initialize zlib stream.");
1215                         return (ARCHIVE_FAILED);
1216                 }
1217                 zip->stream_valid = 1;
1218                 zip->stream.total_in = 0;
1219                 zip->stream.total_out = 0;
1220                 break;
1221 #else
1222                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1223                     "DEFLATE codec is unsupported");
1224                 return (ARCHIVE_FAILED);
1225 #endif
1226         case _7Z_PPMD:
1227         {
1228                 unsigned order;
1229                 uint32_t msize;
1230
1231                 if (zip->ppmd7_valid) {
1232                         __archive_ppmd7_functions.Ppmd7_Free(
1233                             &zip->ppmd7_context);
1234                         zip->ppmd7_valid = 0;
1235                 }
1236
1237                 if (coder1->propertiesSize < 5) {
1238                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1239                             "Malformed PPMd parameter");
1240                         return (ARCHIVE_FAILED);
1241                 }
1242                 order = coder1->properties[0];
1243                 msize = archive_le32dec(&(coder1->properties[1]));
1244                 if (order < PPMD7_MIN_ORDER || order > PPMD7_MAX_ORDER ||
1245                     msize < PPMD7_MIN_MEM_SIZE || msize > PPMD7_MAX_MEM_SIZE) {
1246                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1247                             "Malformed PPMd parameter");
1248                         return (ARCHIVE_FAILED);
1249                 }
1250                 __archive_ppmd7_functions.Ppmd7_Construct(&zip->ppmd7_context);
1251                 r = __archive_ppmd7_functions.Ppmd7_Alloc(
1252                         &zip->ppmd7_context, msize);
1253                 if (r == 0) {
1254                         archive_set_error(&a->archive, ENOMEM,
1255                             "Coludn't allocate memory for PPMd");
1256                         return (ARCHIVE_FATAL);
1257                 }
1258                 __archive_ppmd7_functions.Ppmd7_Init(
1259                         &zip->ppmd7_context, order);
1260                 __archive_ppmd7_functions.Ppmd7z_RangeDec_CreateVTable(
1261                         &zip->range_dec);
1262                 zip->ppmd7_valid = 1;
1263                 zip->ppmd7_stat = 0;
1264                 zip->ppstream.overconsumed = 0;
1265                 zip->ppstream.total_in = 0;
1266                 zip->ppstream.total_out = 0;
1267                 break;
1268         }
1269         case _7Z_X86:
1270         case _7Z_X86_BCJ2:
1271         case _7Z_POWERPC:
1272         case _7Z_IA64:
1273         case _7Z_ARM:
1274         case _7Z_ARMTHUMB:
1275         case _7Z_SPARC:
1276         case _7Z_DELTA:
1277                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1278                     "Unexpected codec ID: %lX", zip->codec);
1279                 return (ARCHIVE_FAILED);
1280         case _7Z_CRYPTO_MAIN_ZIP:
1281         case _7Z_CRYPTO_RAR_29:
1282         case _7Z_CRYPTO_AES_256_SHA_256:
1283                 if (a->entry) {
1284                         archive_entry_set_is_metadata_encrypted(a->entry, 1);
1285                         archive_entry_set_is_data_encrypted(a->entry, 1);
1286                         zip->has_encrypted_entries = 1;
1287                 }
1288                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1289                     "Crypto codec not supported yet (ID: 0x%lX)", zip->codec);
1290                 return (ARCHIVE_FAILED);
1291         default:
1292                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1293                     "Unknown codec ID: %lX", zip->codec);
1294                 return (ARCHIVE_FAILED);
1295         }
1296
1297         return (ARCHIVE_OK);
1298 }
1299
1300 static int
1301 decompress(struct archive_read *a, struct _7zip *zip,
1302     void *buff, size_t *outbytes, const void *b, size_t *used)
1303 {
1304         const uint8_t *t_next_in;
1305         uint8_t *t_next_out;
1306         size_t o_avail_in, o_avail_out;
1307         size_t t_avail_in, t_avail_out;
1308         uint8_t *bcj2_next_out;
1309         size_t bcj2_avail_out;
1310         int r, ret = ARCHIVE_OK;
1311
1312         t_avail_in = o_avail_in = *used;
1313         t_avail_out = o_avail_out = *outbytes;
1314         t_next_in = b;
1315         t_next_out = buff;
1316
1317         if (zip->codec != _7Z_LZMA2 && zip->codec2 == _7Z_X86) {
1318                 int i;
1319
1320                 /* Do not copy out the BCJ remaining bytes when the output
1321                  * buffer size is less than five bytes. */
1322                 if (o_avail_in != 0 && t_avail_out < 5 && zip->odd_bcj_size) {
1323                         *used = 0;
1324                         *outbytes = 0;
1325                         return (ret);
1326                 }
1327                 for (i = 0; zip->odd_bcj_size > 0 && t_avail_out; i++) {
1328                         *t_next_out++ = zip->odd_bcj[i];
1329                         t_avail_out--;
1330                         zip->odd_bcj_size--;
1331                 }
1332                 if (o_avail_in == 0 || t_avail_out == 0) {
1333                         *used = o_avail_in - t_avail_in;
1334                         *outbytes = o_avail_out - t_avail_out;
1335                         if (o_avail_in == 0)
1336                                 ret = ARCHIVE_EOF;
1337                         return (ret);
1338                 }
1339         }
1340
1341         bcj2_next_out = t_next_out;
1342         bcj2_avail_out = t_avail_out;
1343         if (zip->codec2 == _7Z_X86_BCJ2) {
1344                 /*
1345                  * Decord a remaining decompressed main stream for BCJ2.
1346                  */
1347                 if (zip->tmp_stream_bytes_remaining) {
1348                         ssize_t bytes;
1349                         size_t remaining = zip->tmp_stream_bytes_remaining;
1350                         bytes = Bcj2_Decode(zip, t_next_out, t_avail_out);
1351                         if (bytes < 0) {
1352                                 archive_set_error(&(a->archive),
1353                                     ARCHIVE_ERRNO_MISC,
1354                                     "BCJ2 conversion Failed");
1355                                 return (ARCHIVE_FAILED);
1356                         }
1357                         zip->main_stream_bytes_remaining -=
1358                             remaining - zip->tmp_stream_bytes_remaining;
1359                         t_avail_out -= bytes;
1360                         if (o_avail_in == 0 || t_avail_out == 0) {
1361                                 *used = 0;
1362                                 *outbytes = o_avail_out - t_avail_out;
1363                                 if (o_avail_in == 0 &&
1364                                     zip->tmp_stream_bytes_remaining)
1365                                         ret = ARCHIVE_EOF;
1366                                 return (ret);
1367                         }
1368                         t_next_out += bytes;
1369                         bcj2_next_out = t_next_out;
1370                         bcj2_avail_out = t_avail_out;
1371                 }
1372                 t_next_out = zip->tmp_stream_buff;
1373                 t_avail_out = zip->tmp_stream_buff_size;
1374         }
1375
1376         switch (zip->codec) {
1377         case _7Z_COPY:
1378         {
1379                 size_t bytes =
1380                     (t_avail_in > t_avail_out)?t_avail_out:t_avail_in;
1381
1382                 memcpy(t_next_out, t_next_in, bytes);
1383                 t_avail_in -= bytes;
1384                 t_avail_out -= bytes;
1385                 if (o_avail_in == 0)
1386                         ret = ARCHIVE_EOF;
1387                 break;
1388         }
1389 #ifdef HAVE_LZMA_H
1390         case _7Z_LZMA: case _7Z_LZMA2:
1391                 zip->lzstream.next_in = t_next_in;
1392                 zip->lzstream.avail_in = t_avail_in;
1393                 zip->lzstream.next_out = t_next_out;
1394                 zip->lzstream.avail_out = t_avail_out;
1395
1396                 r = lzma_code(&(zip->lzstream), LZMA_RUN);
1397                 switch (r) {
1398                 case LZMA_STREAM_END: /* Found end of stream. */
1399                         lzma_end(&(zip->lzstream));
1400                         zip->lzstream_valid = 0;
1401                         ret = ARCHIVE_EOF;
1402                         break;
1403                 case LZMA_OK: /* Decompressor made some progress. */
1404                         break;
1405                 default:
1406                         archive_set_error(&(a->archive),
1407                             ARCHIVE_ERRNO_MISC,
1408                                 "Decompression failed(%d)",
1409                             r);
1410                         return (ARCHIVE_FAILED);
1411                 }
1412                 t_avail_in = zip->lzstream.avail_in;
1413                 t_avail_out = zip->lzstream.avail_out;
1414                 break;
1415 #endif
1416 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
1417         case _7Z_BZ2:
1418                 zip->bzstream.next_in = (char *)(uintptr_t)t_next_in;
1419                 zip->bzstream.avail_in = t_avail_in;
1420                 zip->bzstream.next_out = (char *)(uintptr_t)t_next_out;
1421                 zip->bzstream.avail_out = t_avail_out;
1422                 r = BZ2_bzDecompress(&(zip->bzstream));
1423                 switch (r) {
1424                 case BZ_STREAM_END: /* Found end of stream. */
1425                         switch (BZ2_bzDecompressEnd(&(zip->bzstream))) {
1426                         case BZ_OK:
1427                                 break;
1428                         default:
1429                                 archive_set_error(&(a->archive),
1430                                     ARCHIVE_ERRNO_MISC,
1431                                     "Failed to clean up decompressor");
1432                                 return (ARCHIVE_FAILED);
1433                         }
1434                         zip->bzstream_valid = 0;
1435                         ret = ARCHIVE_EOF;
1436                         break;
1437                 case BZ_OK: /* Decompressor made some progress. */
1438                         break;
1439                 default:
1440                         archive_set_error(&(a->archive),
1441                             ARCHIVE_ERRNO_MISC,
1442                             "bzip decompression failed");
1443                         return (ARCHIVE_FAILED);
1444                 }
1445                 t_avail_in = zip->bzstream.avail_in;
1446                 t_avail_out = zip->bzstream.avail_out;
1447                 break;
1448 #endif
1449 #ifdef HAVE_ZLIB_H
1450         case _7Z_DEFLATE:
1451                 zip->stream.next_in = (Bytef *)(uintptr_t)t_next_in;
1452                 zip->stream.avail_in = (uInt)t_avail_in;
1453                 zip->stream.next_out = t_next_out;
1454                 zip->stream.avail_out = (uInt)t_avail_out;
1455                 r = inflate(&(zip->stream), 0);
1456                 switch (r) {
1457                 case Z_STREAM_END: /* Found end of stream. */
1458                         ret = ARCHIVE_EOF;
1459                         break;
1460                 case Z_OK: /* Decompressor made some progress.*/
1461                         break;
1462                 default:
1463                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1464                             "File decompression failed (%d)", r);
1465                         return (ARCHIVE_FAILED);
1466                 }
1467                 t_avail_in = zip->stream.avail_in;
1468                 t_avail_out = zip->stream.avail_out;
1469                 break;
1470 #endif
1471         case _7Z_PPMD:
1472         {
1473                 uint64_t flush_bytes;
1474
1475                 if (!zip->ppmd7_valid || zip->ppmd7_stat < 0 ||
1476                     t_avail_out <= 0) {
1477                         archive_set_error(&(a->archive),
1478                             ARCHIVE_ERRNO_MISC,
1479                             "Decompression internal error");
1480                         return (ARCHIVE_FAILED);
1481                 }
1482                 zip->ppstream.next_in = t_next_in;
1483                 zip->ppstream.avail_in = t_avail_in;
1484                 zip->ppstream.next_out = t_next_out;
1485                 zip->ppstream.avail_out = t_avail_out;
1486                 if (zip->ppmd7_stat == 0) {
1487                         zip->bytein.a = a;
1488                         zip->bytein.Read = &ppmd_read;
1489                         zip->range_dec.Stream = &zip->bytein;
1490                         r = __archive_ppmd7_functions.Ppmd7z_RangeDec_Init(
1491                                 &(zip->range_dec));
1492                         if (r == 0) {
1493                                 zip->ppmd7_stat = -1;
1494                                 archive_set_error(&a->archive,
1495                                     ARCHIVE_ERRNO_MISC,
1496                                     "Failed to initialize PPMd range decorder");
1497                                 return (ARCHIVE_FAILED);
1498                         }
1499                         if (zip->ppstream.overconsumed) {
1500                                 zip->ppmd7_stat = -1;
1501                                 return (ARCHIVE_FAILED);
1502                         }
1503                         zip->ppmd7_stat = 1;
1504                 }
1505
1506                 if (t_avail_in == 0)
1507                         /* XXX Flush out remaining decoded data XXX */
1508                         flush_bytes = zip->folder_outbytes_remaining;
1509                 else
1510                         flush_bytes = 0;
1511
1512                 do {
1513                         int sym;
1514
1515                         sym = __archive_ppmd7_functions.Ppmd7_DecodeSymbol(
1516                                 &(zip->ppmd7_context), &(zip->range_dec.p));
1517                         if (sym < 0) {
1518                                 zip->ppmd7_stat = -1;
1519                                 archive_set_error(&a->archive,
1520                                     ARCHIVE_ERRNO_FILE_FORMAT,
1521                                     "Failed to decode PPMd");
1522                                 return (ARCHIVE_FAILED);
1523                         }
1524                         if (zip->ppstream.overconsumed) {
1525                                 zip->ppmd7_stat = -1;
1526                                 return (ARCHIVE_FAILED);
1527                         }
1528                         *zip->ppstream.next_out++ = (unsigned char)sym;
1529                         zip->ppstream.avail_out--;
1530                         zip->ppstream.total_out++;
1531                         if (flush_bytes)
1532                                 flush_bytes--;
1533                 } while (zip->ppstream.avail_out &&
1534                         (zip->ppstream.avail_in || flush_bytes));
1535
1536                 t_avail_in = (size_t)zip->ppstream.avail_in;
1537                 t_avail_out = (size_t)zip->ppstream.avail_out;
1538                 break;
1539         }
1540         default:
1541                 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC,
1542                     "Decompression internal error");
1543                 return (ARCHIVE_FAILED);
1544         }
1545         if (ret != ARCHIVE_OK && ret != ARCHIVE_EOF)
1546                 return (ret);
1547
1548         *used = o_avail_in - t_avail_in;
1549         *outbytes = o_avail_out - t_avail_out;
1550
1551         /*
1552          * Decord BCJ.
1553          */
1554         if (zip->codec != _7Z_LZMA2 && zip->codec2 == _7Z_X86) {
1555                 size_t l = x86_Convert(zip, buff, *outbytes);
1556                 zip->odd_bcj_size = *outbytes - l;
1557                 if (zip->odd_bcj_size > 0 && zip->odd_bcj_size <= 4 &&
1558                     o_avail_in && ret != ARCHIVE_EOF) {
1559                         memcpy(zip->odd_bcj, ((unsigned char *)buff) + l,
1560                             zip->odd_bcj_size);
1561                         *outbytes = l;
1562                 } else
1563                         zip->odd_bcj_size = 0;
1564         }
1565
1566         /*
1567          * Decord BCJ2 with a decompressed main stream.
1568          */
1569         if (zip->codec2 == _7Z_X86_BCJ2) {
1570                 ssize_t bytes;
1571
1572                 zip->tmp_stream_bytes_avail =
1573                     zip->tmp_stream_buff_size - t_avail_out;
1574                 if (zip->tmp_stream_bytes_avail >
1575                       zip->main_stream_bytes_remaining)
1576                         zip->tmp_stream_bytes_avail =
1577                             zip->main_stream_bytes_remaining;
1578                 zip->tmp_stream_bytes_remaining = zip->tmp_stream_bytes_avail;
1579                 bytes = Bcj2_Decode(zip, bcj2_next_out, bcj2_avail_out);
1580                 if (bytes < 0) {
1581                         archive_set_error(&(a->archive),
1582                             ARCHIVE_ERRNO_MISC, "BCJ2 conversion Failed");
1583                         return (ARCHIVE_FAILED);
1584                 }
1585                 zip->main_stream_bytes_remaining -=
1586                     zip->tmp_stream_bytes_avail
1587                       - zip->tmp_stream_bytes_remaining;
1588                 bcj2_avail_out -= bytes;
1589                 *outbytes = o_avail_out - bcj2_avail_out;
1590         }
1591
1592         return (ret);
1593 }
1594
1595 static int
1596 free_decompression(struct archive_read *a, struct _7zip *zip)
1597 {
1598         int r = ARCHIVE_OK;
1599
1600 #if !defined(HAVE_ZLIB_H) &&\
1601         !(defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR))
1602         (void)a;/* UNUSED */
1603 #endif
1604 #ifdef HAVE_LZMA_H
1605         if (zip->lzstream_valid)
1606                 lzma_end(&(zip->lzstream));
1607 #endif
1608 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
1609         if (zip->bzstream_valid) {
1610                 if (BZ2_bzDecompressEnd(&(zip->bzstream)) != BZ_OK) {
1611                         archive_set_error(&a->archive,
1612                             ARCHIVE_ERRNO_MISC,
1613                             "Failed to clean up bzip2 decompressor");
1614                         r = ARCHIVE_FATAL;
1615                 }
1616                 zip->bzstream_valid = 0;
1617         }
1618 #endif
1619 #ifdef HAVE_ZLIB_H
1620         if (zip->stream_valid) {
1621                 if (inflateEnd(&(zip->stream)) != Z_OK) {
1622                         archive_set_error(&a->archive,
1623                             ARCHIVE_ERRNO_MISC,
1624                             "Failed to clean up zlib decompressor");
1625                         r = ARCHIVE_FATAL;
1626                 }
1627                 zip->stream_valid = 0;
1628         }
1629 #endif
1630         if (zip->ppmd7_valid) {
1631                 __archive_ppmd7_functions.Ppmd7_Free(
1632                         &zip->ppmd7_context);
1633                 zip->ppmd7_valid = 0;
1634         }
1635         return (r);
1636 }
1637
1638 static int
1639 parse_7zip_uint64(struct archive_read *a, uint64_t *val)
1640 {
1641         const unsigned char *p;
1642         unsigned char avail, mask;
1643         int i;
1644
1645         if ((p = header_bytes(a, 1)) == NULL)
1646                 return (-1);
1647         avail = *p;
1648         mask = 0x80;
1649         *val = 0;
1650         for (i = 0; i < 8; i++) {
1651                 if (avail & mask) {
1652                         if ((p = header_bytes(a, 1)) == NULL)
1653                                 return (-1);
1654                         *val |= ((uint64_t)*p) << (8 * i);
1655                         mask >>= 1;
1656                         continue;
1657                 }
1658                 *val += ((uint64_t)(avail & (mask -1))) << (8 * i);
1659                 break;
1660         }
1661         return (0);
1662 }
1663
1664 static int
1665 read_Bools(struct archive_read *a, unsigned char *data, size_t num)
1666 {
1667         const unsigned char *p;
1668         unsigned i, mask = 0, avail = 0;
1669
1670         for (i = 0; i < num; i++) {
1671                 if (mask == 0) {
1672                         if ((p = header_bytes(a, 1)) == NULL)
1673                                 return (-1);
1674                         avail = *p;
1675                         mask = 0x80;
1676                 }
1677                 data[i] = (avail & mask)?1:0;
1678                 mask >>= 1;
1679         }
1680         return (0);
1681 }
1682
1683 static void
1684 free_Digest(struct _7z_digests *d)
1685 {
1686         free(d->defineds);
1687         free(d->digests);
1688 }
1689
1690 static int
1691 read_Digests(struct archive_read *a, struct _7z_digests *d, size_t num)
1692 {
1693         const unsigned char *p;
1694         unsigned i;
1695
1696         if (num == 0)
1697                 return (-1);
1698         memset(d, 0, sizeof(*d));
1699
1700         d->defineds = malloc(num);
1701         if (d->defineds == NULL)
1702                 return (-1);
1703         /*
1704          * Read Bools.
1705          */
1706         if ((p = header_bytes(a, 1)) == NULL)
1707                 return (-1);
1708         if (*p == 0) {
1709                 if (read_Bools(a, d->defineds, num) < 0)
1710                         return (-1);
1711         } else
1712                 /* All are defined */
1713                 memset(d->defineds, 1, num);
1714
1715         d->digests = calloc(num, sizeof(*d->digests));
1716         if (d->digests == NULL)
1717                 return (-1);
1718         for (i = 0; i < num; i++) {
1719                 if (d->defineds[i]) {
1720                         if ((p = header_bytes(a, 4)) == NULL)
1721                                 return (-1);
1722                         d->digests[i] = archive_le32dec(p);
1723                 }
1724         }
1725
1726         return (0);
1727 }
1728
1729 static void
1730 free_PackInfo(struct _7z_pack_info *pi)
1731 {
1732         free(pi->sizes);
1733         free(pi->positions);
1734         free_Digest(&(pi->digest));
1735 }
1736
1737 static int
1738 read_PackInfo(struct archive_read *a, struct _7z_pack_info *pi)
1739 {
1740         const unsigned char *p;
1741         unsigned i;
1742
1743         memset(pi, 0, sizeof(*pi));
1744
1745         /*
1746          * Read PackPos.
1747          */
1748         if (parse_7zip_uint64(a, &(pi->pos)) < 0)
1749                 return (-1);
1750
1751         /*
1752          * Read NumPackStreams.
1753          */
1754         if (parse_7zip_uint64(a, &(pi->numPackStreams)) < 0)
1755                 return (-1);
1756         if (pi->numPackStreams == 0)
1757                 return (-1);
1758         if (UMAX_ENTRY < pi->numPackStreams)
1759                 return (-1);
1760
1761         /*
1762          * Read PackSizes[num]
1763          */
1764         if ((p = header_bytes(a, 1)) == NULL)
1765                 return (-1);
1766         if (*p == kEnd)
1767                 /* PackSizes[num] are not present. */
1768                 return (0);
1769         if (*p != kSize)
1770                 return (-1);
1771         pi->sizes = calloc((size_t)pi->numPackStreams, sizeof(uint64_t));
1772         pi->positions = calloc((size_t)pi->numPackStreams, sizeof(uint64_t));
1773         if (pi->sizes == NULL || pi->positions == NULL)
1774                 return (-1);
1775
1776         for (i = 0; i < pi->numPackStreams; i++) {
1777                 if (parse_7zip_uint64(a, &(pi->sizes[i])) < 0)
1778                         return (-1);
1779         }
1780
1781         /*
1782          * Read PackStreamDigests[num]
1783          */
1784         if ((p = header_bytes(a, 1)) == NULL)
1785                 return (-1);
1786         if (*p == kEnd) {
1787                 /* PackStreamDigests[num] are not present. */
1788                 pi->digest.defineds =
1789                     calloc((size_t)pi->numPackStreams, sizeof(*pi->digest.defineds));
1790                 pi->digest.digests =
1791                     calloc((size_t)pi->numPackStreams, sizeof(*pi->digest.digests));
1792                 if (pi->digest.defineds == NULL || pi->digest.digests == NULL)
1793                         return (-1);
1794                 return (0);
1795         }
1796
1797         if (*p != kCRC)
1798                 return (-1);
1799
1800         if (read_Digests(a, &(pi->digest), (size_t)pi->numPackStreams) < 0)
1801                 return (-1);
1802
1803         /*
1804          *  Must be marked by kEnd.
1805          */
1806         if ((p = header_bytes(a, 1)) == NULL)
1807                 return (-1);
1808         if (*p != kEnd)
1809                 return (-1);
1810         return (0);
1811 }
1812
1813 static void
1814 free_Folder(struct _7z_folder *f)
1815 {
1816         unsigned i;
1817
1818         if (f->coders) {
1819                 for (i = 0; i< f->numCoders; i++) {
1820                         free(f->coders[i].properties);
1821                 }
1822                 free(f->coders);
1823         }
1824         free(f->bindPairs);
1825         free(f->packedStreams);
1826         free(f->unPackSize);
1827 }
1828
1829 static int
1830 read_Folder(struct archive_read *a, struct _7z_folder *f)
1831 {
1832         struct _7zip *zip = (struct _7zip *)a->format->data;
1833         const unsigned char *p;
1834         uint64_t numInStreamsTotal = 0;
1835         uint64_t numOutStreamsTotal = 0;
1836         unsigned i;
1837
1838         memset(f, 0, sizeof(*f));
1839
1840         /*
1841          * Read NumCoders.
1842          */
1843         if (parse_7zip_uint64(a, &(f->numCoders)) < 0)
1844                 return (-1);
1845         if (f->numCoders > 4)
1846                 /* Too many coders. */
1847                 return (-1);
1848
1849         f->coders = calloc((size_t)f->numCoders, sizeof(*f->coders));
1850         if (f->coders == NULL)
1851                 return (-1);
1852         for (i = 0; i< f->numCoders; i++) {
1853                 size_t codec_size;
1854                 int simple, attr;
1855
1856                 if ((p = header_bytes(a, 1)) == NULL)
1857                         return (-1);
1858                 /*
1859                  * 0:3 CodecIdSize
1860                  * 4:  0 - IsSimple
1861                  *     1 - Is not Simple
1862                  * 5:  0 - No Attributes
1863                  *     1 - There are Attributes;
1864                  * 7:  Must be zero.
1865                  */
1866                 codec_size = *p & 0xf;
1867                 simple = (*p & 0x10)?0:1;
1868                 attr = *p & 0x20;
1869                 if (*p & 0x80)
1870                         return (-1);/* Not supported. */
1871
1872                 /*
1873                  * Read Decompression Method IDs.
1874                  */
1875                 if ((p = header_bytes(a, codec_size)) == NULL)
1876                         return (-1);
1877
1878                 f->coders[i].codec = decode_codec_id(p, codec_size);
1879
1880                 if (simple) {
1881                         f->coders[i].numInStreams = 1;
1882                         f->coders[i].numOutStreams = 1;
1883                 } else {
1884                         if (parse_7zip_uint64(
1885                             a, &(f->coders[i].numInStreams)) < 0)
1886                                 return (-1);
1887                         if (UMAX_ENTRY < f->coders[i].numInStreams)
1888                                 return (-1);
1889                         if (parse_7zip_uint64(
1890                             a, &(f->coders[i].numOutStreams)) < 0)
1891                                 return (-1);
1892                         if (UMAX_ENTRY < f->coders[i].numOutStreams)
1893                                 return (-1);
1894                 }
1895
1896                 if (attr) {
1897                         if (parse_7zip_uint64(
1898                             a, &(f->coders[i].propertiesSize)) < 0)
1899                                 return (-1);
1900                         if ((p = header_bytes(
1901                             a, (size_t)f->coders[i].propertiesSize)) == NULL)
1902                                 return (-1);
1903                         f->coders[i].properties =
1904                             malloc((size_t)f->coders[i].propertiesSize);
1905                         if (f->coders[i].properties == NULL)
1906                                 return (-1);
1907                         memcpy(f->coders[i].properties, p,
1908                             (size_t)f->coders[i].propertiesSize);
1909                 }
1910
1911                 numInStreamsTotal += f->coders[i].numInStreams;
1912                 numOutStreamsTotal += f->coders[i].numOutStreams;
1913         }
1914
1915         if (numOutStreamsTotal == 0 ||
1916             numInStreamsTotal < numOutStreamsTotal-1)
1917                 return (-1);
1918
1919         f->numBindPairs = numOutStreamsTotal - 1;
1920         if (zip->header_bytes_remaining < f->numBindPairs)
1921                         return (-1);
1922         if (f->numBindPairs > 0) {
1923                 f->bindPairs =
1924                         calloc((size_t)f->numBindPairs, sizeof(*f->bindPairs));
1925                 if (f->bindPairs == NULL)
1926                         return (-1);
1927         } else
1928                 f->bindPairs = NULL;
1929         for (i = 0; i < f->numBindPairs; i++) {
1930                 if (parse_7zip_uint64(a, &(f->bindPairs[i].inIndex)) < 0)
1931                         return (-1);
1932                 if (UMAX_ENTRY < f->bindPairs[i].inIndex)
1933                         return (-1);
1934                 if (parse_7zip_uint64(a, &(f->bindPairs[i].outIndex)) < 0)
1935                         return (-1);
1936                 if (UMAX_ENTRY < f->bindPairs[i].outIndex)
1937                         return (-1);
1938         }
1939
1940         f->numPackedStreams = numInStreamsTotal - f->numBindPairs;
1941         f->packedStreams =
1942             calloc((size_t)f->numPackedStreams, sizeof(*f->packedStreams));
1943         if (f->packedStreams == NULL)
1944                 return (-1);
1945         if (f->numPackedStreams == 1) {
1946                 for (i = 0; i < numInStreamsTotal; i++) {
1947                         unsigned j;
1948                         for (j = 0; j < f->numBindPairs; j++) {
1949                                 if (f->bindPairs[j].inIndex == i)
1950                                         break;
1951                         }
1952                         if (j == f->numBindPairs)
1953                                 break;
1954                 }
1955                 if (i == numInStreamsTotal)
1956                         return (-1);
1957                 f->packedStreams[0] = i;
1958         } else {
1959                 for (i = 0; i < f->numPackedStreams; i++) {
1960                         if (parse_7zip_uint64(a, &(f->packedStreams[i])) < 0)
1961                                 return (-1);
1962                         if (UMAX_ENTRY < f->packedStreams[i])
1963                                 return (-1);
1964                 }
1965         }
1966         f->numInStreams = numInStreamsTotal;
1967         f->numOutStreams = numOutStreamsTotal;
1968
1969         return (0);
1970 }
1971
1972 static void
1973 free_CodersInfo(struct _7z_coders_info *ci)
1974 {
1975         unsigned i;
1976
1977         if (ci->folders) {
1978                 for (i = 0; i < ci->numFolders; i++)
1979                         free_Folder(&(ci->folders[i]));
1980                 free(ci->folders);
1981         }
1982 }
1983
1984 static int
1985 read_CodersInfo(struct archive_read *a, struct _7z_coders_info *ci)
1986 {
1987         const unsigned char *p;
1988         struct _7z_digests digest;
1989         unsigned i;
1990
1991         memset(ci, 0, sizeof(*ci));
1992         memset(&digest, 0, sizeof(digest));
1993
1994         if ((p = header_bytes(a, 1)) == NULL)
1995                 goto failed;
1996         if (*p != kFolder)
1997                 goto failed;
1998
1999         /*
2000          * Read NumFolders.
2001          */
2002         if (parse_7zip_uint64(a, &(ci->numFolders)) < 0)
2003                 goto failed;
2004         if (UMAX_ENTRY < ci->numFolders)
2005                 return (-1);
2006
2007         /*
2008          * Read External.
2009          */
2010         if ((p = header_bytes(a, 1)) == NULL)
2011                 goto failed;
2012         switch (*p) {
2013         case 0:
2014                 ci->folders =
2015                         calloc((size_t)ci->numFolders, sizeof(*ci->folders));
2016                 if (ci->folders == NULL)
2017                         return (-1);
2018                 for (i = 0; i < ci->numFolders; i++) {
2019                         if (read_Folder(a, &(ci->folders[i])) < 0)
2020                                 goto failed;
2021                 }
2022                 break;
2023         case 1:
2024                 if (parse_7zip_uint64(a, &(ci->dataStreamIndex)) < 0)
2025                         return (-1);
2026                 if (UMAX_ENTRY < ci->dataStreamIndex)
2027                         return (-1);
2028                 if (ci->numFolders > 0) {
2029                         archive_set_error(&a->archive, -1,
2030                             "Malformed 7-Zip archive");
2031                         goto failed;
2032                 }
2033                 break;
2034         default:
2035                 archive_set_error(&a->archive, -1,
2036                     "Malformed 7-Zip archive");
2037                 goto failed;
2038         }
2039
2040         if ((p = header_bytes(a, 1)) == NULL)
2041                 goto failed;
2042         if (*p != kCodersUnPackSize)
2043                 goto failed;
2044
2045         for (i = 0; i < ci->numFolders; i++) {
2046                 struct _7z_folder *folder = &(ci->folders[i]);
2047                 unsigned j;
2048
2049                 folder->unPackSize =
2050                     calloc((size_t)folder->numOutStreams, sizeof(*folder->unPackSize));
2051                 if (folder->unPackSize == NULL)
2052                         goto failed;
2053                 for (j = 0; j < folder->numOutStreams; j++) {
2054                         if (parse_7zip_uint64(a, &(folder->unPackSize[j])) < 0)
2055                                 goto failed;
2056                 }
2057         }
2058
2059         /*
2060          * Read CRCs.
2061          */
2062         if ((p = header_bytes(a, 1)) == NULL)
2063                 goto failed;
2064         if (*p == kEnd)
2065                 return (0);
2066         if (*p != kCRC)
2067                 goto failed;
2068         if (read_Digests(a, &digest, (size_t)ci->numFolders) < 0)
2069                 goto failed;
2070         for (i = 0; i < ci->numFolders; i++) {
2071                 ci->folders[i].digest_defined = digest.defineds[i];
2072                 ci->folders[i].digest = digest.digests[i];
2073         }
2074
2075         /*
2076          *  Must be kEnd.
2077          */
2078         if ((p = header_bytes(a, 1)) == NULL)
2079                 goto failed;
2080         if (*p != kEnd)
2081                 goto failed;
2082         free_Digest(&digest);
2083         return (0);
2084 failed:
2085         free_Digest(&digest);
2086         return (-1);
2087 }
2088
2089 static uint64_t
2090 folder_uncompressed_size(struct _7z_folder *f)
2091 {
2092         int n = (int)f->numOutStreams;
2093         unsigned pairs = (unsigned)f->numBindPairs;
2094
2095         while (--n >= 0) {
2096                 unsigned i;
2097                 for (i = 0; i < pairs; i++) {
2098                         if (f->bindPairs[i].outIndex == (uint64_t)n)
2099                                 break;
2100                 }
2101                 if (i >= pairs)
2102                         return (f->unPackSize[n]);
2103         }
2104         return (0);
2105 }
2106
2107 static void
2108 free_SubStreamsInfo(struct _7z_substream_info *ss)
2109 {
2110         free(ss->unpackSizes);
2111         free(ss->digestsDefined);
2112         free(ss->digests);
2113 }
2114
2115 static int
2116 read_SubStreamsInfo(struct archive_read *a, struct _7z_substream_info *ss,
2117     struct _7z_folder *f, size_t numFolders)
2118 {
2119         const unsigned char *p;
2120         uint64_t *usizes;
2121         size_t unpack_streams;
2122         int type;
2123         unsigned i;
2124         uint32_t numDigests;
2125
2126         memset(ss, 0, sizeof(*ss));
2127
2128         for (i = 0; i < numFolders; i++)
2129                 f[i].numUnpackStreams = 1;
2130
2131         if ((p = header_bytes(a, 1)) == NULL)
2132                 return (-1);
2133         type = *p;
2134
2135         if (type == kNumUnPackStream) {
2136                 unpack_streams = 0;
2137                 for (i = 0; i < numFolders; i++) {
2138                         if (parse_7zip_uint64(a, &(f[i].numUnpackStreams)) < 0)
2139                                 return (-1);
2140                         if (UMAX_ENTRY < f[i].numUnpackStreams)
2141                                 return (-1);
2142                         if (unpack_streams > SIZE_MAX - UMAX_ENTRY) {
2143                                 return (-1);
2144                         }
2145                         unpack_streams += (size_t)f[i].numUnpackStreams;
2146                 }
2147                 if ((p = header_bytes(a, 1)) == NULL)
2148                         return (-1);
2149                 type = *p;
2150         } else
2151                 unpack_streams = numFolders;
2152
2153         ss->unpack_streams = unpack_streams;
2154         if (unpack_streams) {
2155                 ss->unpackSizes = calloc(unpack_streams,
2156                     sizeof(*ss->unpackSizes));
2157                 ss->digestsDefined = calloc(unpack_streams,
2158                     sizeof(*ss->digestsDefined));
2159                 ss->digests = calloc(unpack_streams,
2160                     sizeof(*ss->digests));
2161                 if (ss->unpackSizes == NULL || ss->digestsDefined == NULL ||
2162                     ss->digests == NULL)
2163                         return (-1);
2164         }
2165
2166         usizes = ss->unpackSizes;
2167         for (i = 0; i < numFolders; i++) {
2168                 unsigned pack;
2169                 uint64_t sum;
2170
2171                 if (f[i].numUnpackStreams == 0)
2172                         continue;
2173
2174                 sum = 0;
2175                 if (type == kSize) {
2176                         for (pack = 1; pack < f[i].numUnpackStreams; pack++) {
2177                                 if (parse_7zip_uint64(a, usizes) < 0)
2178                                         return (-1);
2179                                 sum += *usizes++;
2180                         }
2181                 }
2182                 *usizes++ = folder_uncompressed_size(&f[i]) - sum;
2183         }
2184
2185         if (type == kSize) {
2186                 if ((p = header_bytes(a, 1)) == NULL)
2187                         return (-1);
2188                 type = *p;
2189         }
2190
2191         for (i = 0; i < unpack_streams; i++) {
2192                 ss->digestsDefined[i] = 0;
2193                 ss->digests[i] = 0;
2194         }
2195
2196         numDigests = 0;
2197         for (i = 0; i < numFolders; i++) {
2198                 if (f[i].numUnpackStreams != 1 || !f[i].digest_defined)
2199                         numDigests += (uint32_t)f[i].numUnpackStreams;
2200         }
2201
2202         if (type == kCRC) {
2203                 struct _7z_digests tmpDigests;
2204                 unsigned char *digestsDefined = ss->digestsDefined;
2205                 uint32_t * digests = ss->digests;
2206                 int di = 0;
2207
2208                 memset(&tmpDigests, 0, sizeof(tmpDigests));
2209                 if (read_Digests(a, &(tmpDigests), numDigests) < 0) {
2210                         free_Digest(&tmpDigests);
2211                         return (-1);
2212                 }
2213                 for (i = 0; i < numFolders; i++) {
2214                         if (f[i].numUnpackStreams == 1 && f[i].digest_defined) {
2215                                 *digestsDefined++ = 1;
2216                                 *digests++ = f[i].digest;
2217                         } else {
2218                                 unsigned j;
2219
2220                                 for (j = 0; j < f[i].numUnpackStreams;
2221                                     j++, di++) {
2222                                         *digestsDefined++ =
2223                                             tmpDigests.defineds[di];
2224                                         *digests++ =
2225                                             tmpDigests.digests[di];
2226                                 }
2227                         }
2228                 }
2229                 free_Digest(&tmpDigests);
2230                 if ((p = header_bytes(a, 1)) == NULL)
2231                         return (-1);
2232                 type = *p;
2233         }
2234
2235         /*
2236          *  Must be kEnd.
2237          */
2238         if (type != kEnd)
2239                 return (-1);
2240         return (0);
2241 }
2242
2243 static void
2244 free_StreamsInfo(struct _7z_stream_info *si)
2245 {
2246         free_PackInfo(&(si->pi));
2247         free_CodersInfo(&(si->ci));
2248         free_SubStreamsInfo(&(si->ss));
2249 }
2250
2251 static int
2252 read_StreamsInfo(struct archive_read *a, struct _7z_stream_info *si)
2253 {
2254         struct _7zip *zip = (struct _7zip *)a->format->data;
2255         const unsigned char *p;
2256         unsigned i;
2257
2258         memset(si, 0, sizeof(*si));
2259
2260         if ((p = header_bytes(a, 1)) == NULL)
2261                 return (-1);
2262         if (*p == kPackInfo) {
2263                 uint64_t packPos;
2264
2265                 if (read_PackInfo(a, &(si->pi)) < 0)
2266                         return (-1);
2267
2268                 if (si->pi.positions == NULL || si->pi.sizes == NULL)
2269                         return (-1);
2270                 /*
2271                  * Calculate packed stream positions.
2272                  */
2273                 packPos = si->pi.pos;
2274                 for (i = 0; i < si->pi.numPackStreams; i++) {
2275                         si->pi.positions[i] = packPos;
2276                         packPos += si->pi.sizes[i];
2277                         if (packPos > zip->header_offset)
2278                                 return (-1);
2279                 }
2280                 if ((p = header_bytes(a, 1)) == NULL)
2281                         return (-1);
2282         }
2283         if (*p == kUnPackInfo) {
2284                 uint32_t packIndex;
2285                 struct _7z_folder *f;
2286
2287                 if (read_CodersInfo(a, &(si->ci)) < 0)
2288                         return (-1);
2289
2290                 /*
2291                  * Calculate packed stream indexes.
2292                  */
2293                 packIndex = 0;
2294                 f = si->ci.folders;
2295                 for (i = 0; i < si->ci.numFolders; i++) {
2296                         f[i].packIndex = packIndex;
2297                         packIndex += (uint32_t)f[i].numPackedStreams;
2298                         if (packIndex > si->pi.numPackStreams)
2299                                 return (-1);
2300                 }
2301                 if ((p = header_bytes(a, 1)) == NULL)
2302                         return (-1);
2303         }
2304
2305         if (*p == kSubStreamsInfo) {
2306                 if (read_SubStreamsInfo(a, &(si->ss),
2307                     si->ci.folders, (size_t)si->ci.numFolders) < 0)
2308                         return (-1);
2309                 if ((p = header_bytes(a, 1)) == NULL)
2310                         return (-1);
2311         }
2312
2313         /*
2314          *  Must be kEnd.
2315          */
2316         if (*p != kEnd)
2317                 return (-1);
2318         return (0);
2319 }
2320
2321 static void
2322 free_Header(struct _7z_header_info *h)
2323 {
2324         free(h->emptyStreamBools);
2325         free(h->emptyFileBools);
2326         free(h->antiBools);
2327         free(h->attrBools);
2328 }
2329
2330 static int
2331 read_Header(struct archive_read *a, struct _7z_header_info *h,
2332     int check_header_id)
2333 {
2334         struct _7zip *zip = (struct _7zip *)a->format->data;
2335         const unsigned char *p;
2336         struct _7z_folder *folders;
2337         struct _7z_stream_info *si = &(zip->si);
2338         struct _7zip_entry *entries;
2339         uint32_t folderIndex, indexInFolder;
2340         unsigned i;
2341         int eindex, empty_streams, sindex;
2342
2343         if (check_header_id) {
2344                 /*
2345                  * Read Header.
2346                  */
2347                 if ((p = header_bytes(a, 1)) == NULL)
2348                         return (-1);
2349                 if (*p != kHeader)
2350                         return (-1);
2351         }
2352
2353         /*
2354          * Read ArchiveProperties.
2355          */
2356         if ((p = header_bytes(a, 1)) == NULL)
2357                 return (-1);
2358         if (*p == kArchiveProperties) {
2359                 for (;;) {
2360                         uint64_t size;
2361                         if ((p = header_bytes(a, 1)) == NULL)
2362                                 return (-1);
2363                         if (*p == 0)
2364                                 break;
2365                         if (parse_7zip_uint64(a, &size) < 0)
2366                                 return (-1);
2367                 }
2368                 if ((p = header_bytes(a, 1)) == NULL)
2369                         return (-1);
2370         }
2371
2372         /*
2373          * Read MainStreamsInfo.
2374          */
2375         if (*p == kMainStreamsInfo) {
2376                 if (read_StreamsInfo(a, &(zip->si)) < 0)
2377                         return (-1);
2378                 if ((p = header_bytes(a, 1)) == NULL)
2379                         return (-1);
2380         }
2381         if (*p == kEnd)
2382                 return (0);
2383
2384         /*
2385          * Read FilesInfo.
2386          */
2387         if (*p != kFilesInfo)
2388                 return (-1);
2389
2390         if (parse_7zip_uint64(a, &(zip->numFiles)) < 0)
2391                 return (-1);
2392         if (UMAX_ENTRY < zip->numFiles)
2393                 return (-1);
2394
2395         zip->entries = calloc((size_t)zip->numFiles, sizeof(*zip->entries));
2396         if (zip->entries == NULL)
2397                 return (-1);
2398         entries = zip->entries;
2399
2400         empty_streams = 0;
2401         for (;;) {
2402                 int type;
2403                 uint64_t size;
2404                 size_t ll;
2405
2406                 if ((p = header_bytes(a, 1)) == NULL)
2407                         return (-1);
2408                 type = *p;
2409                 if (type == kEnd)
2410                         break;
2411
2412                 if (parse_7zip_uint64(a, &size) < 0)
2413                         return (-1);
2414                 if (zip->header_bytes_remaining < size)
2415                         return (-1);
2416                 ll = (size_t)size;
2417
2418                 switch (type) {
2419                 case kEmptyStream:
2420                         if (h->emptyStreamBools != NULL)
2421                                 return (-1);
2422                         h->emptyStreamBools = calloc((size_t)zip->numFiles,
2423                             sizeof(*h->emptyStreamBools));
2424                         if (h->emptyStreamBools == NULL)
2425                                 return (-1);
2426                         if (read_Bools(
2427                             a, h->emptyStreamBools, (size_t)zip->numFiles) < 0)
2428                                 return (-1);
2429                         empty_streams = 0;
2430                         for (i = 0; i < zip->numFiles; i++) {
2431                                 if (h->emptyStreamBools[i])
2432                                         empty_streams++;
2433                         }
2434                         break;
2435                 case kEmptyFile:
2436                         if (empty_streams <= 0) {
2437                                 /* Unexcepted sequence. Skip this. */
2438                                 if (header_bytes(a, ll) == NULL)
2439                                         return (-1);
2440                                 break;
2441                         }
2442                         if (h->emptyFileBools != NULL)
2443                                 return (-1);
2444                         h->emptyFileBools = calloc(empty_streams,
2445                             sizeof(*h->emptyFileBools));
2446                         if (h->emptyFileBools == NULL)
2447                                 return (-1);
2448                         if (read_Bools(a, h->emptyFileBools, empty_streams) < 0)
2449                                 return (-1);
2450                         break;
2451                 case kAnti:
2452                         if (empty_streams <= 0) {
2453                                 /* Unexcepted sequence. Skip this. */
2454                                 if (header_bytes(a, ll) == NULL)
2455                                         return (-1);
2456                                 break;
2457                         }
2458                         if (h->antiBools != NULL)
2459                                 return (-1);
2460                         h->antiBools = calloc(empty_streams,
2461                             sizeof(*h->antiBools));
2462                         if (h->antiBools == NULL)
2463                                 return (-1);
2464                         if (read_Bools(a, h->antiBools, empty_streams) < 0)
2465                                 return (-1);
2466                         break;
2467                 case kCTime:
2468                 case kATime:
2469                 case kMTime:
2470                         if (read_Times(a, h, type) < 0)
2471                                 return (-1);
2472                         break;
2473                 case kName:
2474                 {
2475                         unsigned char *np;
2476                         size_t nl, nb;
2477
2478                         /* Skip one byte. */
2479                         if ((p = header_bytes(a, 1)) == NULL)
2480                                 return (-1);
2481                         ll--;
2482
2483                         if ((ll & 1) || ll < zip->numFiles * 4)
2484                                 return (-1);
2485
2486                         if (zip->entry_names != NULL)
2487                                 return (-1);
2488                         zip->entry_names = malloc(ll);
2489                         if (zip->entry_names == NULL)
2490                                 return (-1);
2491                         np = zip->entry_names;
2492                         nb = ll;
2493                         /*
2494                          * Copy whole file names.
2495                          * NOTE: This loop prevents from expanding
2496                          * the uncompressed buffer in order not to
2497                          * use extra memory resource.
2498                          */
2499                         while (nb) {
2500                                 size_t b;
2501                                 if (nb > UBUFF_SIZE)
2502                                         b = UBUFF_SIZE;
2503                                 else
2504                                         b = nb;
2505                                 if ((p = header_bytes(a, b)) == NULL)
2506                                         return (-1);
2507                                 memcpy(np, p, b);
2508                                 np += b;
2509                                 nb -= b;
2510                         }
2511                         np = zip->entry_names;
2512                         nl = ll;
2513
2514                         for (i = 0; i < zip->numFiles; i++) {
2515                                 entries[i].utf16name = np;
2516 #if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG)
2517                                 entries[i].wname = (wchar_t *)np;
2518 #endif
2519
2520                                 /* Find a terminator. */
2521                                 while (nl >= 2 && (np[0] || np[1])) {
2522                                         np += 2;
2523                                         nl -= 2;
2524                                 }
2525                                 if (nl < 2)
2526                                         return (-1);/* Terminator not found */
2527                                 entries[i].name_len = np - entries[i].utf16name;
2528                                 np += 2;
2529                                 nl -= 2;
2530                         }
2531                         break;
2532                 }
2533                 case kAttributes:
2534                 {
2535                         int allAreDefined;
2536
2537                         if ((p = header_bytes(a, 2)) == NULL)
2538                                 return (-1);
2539                         allAreDefined = *p;
2540                         if (h->attrBools != NULL)
2541                                 return (-1);
2542                         h->attrBools = calloc((size_t)zip->numFiles,
2543                             sizeof(*h->attrBools));
2544                         if (h->attrBools == NULL)
2545                                 return (-1);
2546                         if (allAreDefined)
2547                                 memset(h->attrBools, 1, (size_t)zip->numFiles);
2548                         else {
2549                                 if (read_Bools(a, h->attrBools,
2550                                       (size_t)zip->numFiles) < 0)
2551                                         return (-1);
2552                         }
2553                         for (i = 0; i < zip->numFiles; i++) {
2554                                 if (h->attrBools[i]) {
2555                                         if ((p = header_bytes(a, 4)) == NULL)
2556                                                 return (-1);
2557                                         entries[i].attr = archive_le32dec(p);
2558                                 }
2559                         }
2560                         break;
2561                 }
2562                 case kDummy:
2563                         if (ll == 0)
2564                                 break;
2565                         __LA_FALLTHROUGH;
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                 *buff = __archive_read_ahead(a, minimum, &bytes_avail);
2975                 if (bytes_avail <= 0) {
2976                         archive_set_error(&a->archive,
2977                             ARCHIVE_ERRNO_FILE_FORMAT,
2978                             "Truncated 7-Zip file data");
2979                         return (ARCHIVE_FATAL);
2980                 }
2981                 if ((size_t)bytes_avail >
2982                     zip->uncompressed_buffer_bytes_remaining)
2983                         bytes_avail = (ssize_t)
2984                             zip->uncompressed_buffer_bytes_remaining;
2985                 if ((size_t)bytes_avail > size)
2986                         bytes_avail = (ssize_t)size;
2987
2988                 zip->pack_stream_bytes_unconsumed = bytes_avail;
2989         } else if (zip->uncompressed_buffer_pointer == NULL) {
2990                 /* Decompression has failed. */
2991                 archive_set_error(&(a->archive),
2992                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
2993                 return (ARCHIVE_FATAL);
2994         } else {
2995                 /* Packed mode. */
2996                 if (minimum > zip->uncompressed_buffer_bytes_remaining) {
2997                         /*
2998                          * If remaining uncompressed data size is less than
2999                          * the minimum size, fill the buffer up to the
3000                          * minimum size.
3001                          */
3002                         if (extract_pack_stream(a, minimum) < 0)
3003                                 return (ARCHIVE_FATAL);
3004                 }
3005                 if (size > zip->uncompressed_buffer_bytes_remaining)
3006                         bytes_avail = (ssize_t)
3007                             zip->uncompressed_buffer_bytes_remaining;
3008                 else
3009                         bytes_avail = (ssize_t)size;
3010                 *buff = zip->uncompressed_buffer_pointer;
3011                 zip->uncompressed_buffer_pointer += bytes_avail;
3012         }
3013         zip->uncompressed_buffer_bytes_remaining -= bytes_avail;
3014         return (bytes_avail);
3015 }
3016
3017 static ssize_t
3018 extract_pack_stream(struct archive_read *a, size_t minimum)
3019 {
3020         struct _7zip *zip = (struct _7zip *)a->format->data;
3021         ssize_t bytes_avail;
3022         int r;
3023
3024         if (zip->codec == _7Z_COPY && zip->codec2 == (unsigned long)-1) {
3025                 if (minimum == 0)
3026                         minimum = 1;
3027                 if (__archive_read_ahead(a, minimum, &bytes_avail) == NULL
3028                     || bytes_avail <= 0) {
3029                         archive_set_error(&a->archive,
3030                             ARCHIVE_ERRNO_FILE_FORMAT,
3031                             "Truncated 7-Zip file body");
3032                         return (ARCHIVE_FATAL);
3033                 }
3034                 if (bytes_avail > (ssize_t)zip->pack_stream_inbytes_remaining)
3035                         bytes_avail = (ssize_t)zip->pack_stream_inbytes_remaining;
3036                 zip->pack_stream_inbytes_remaining -= bytes_avail;
3037                 if (bytes_avail > (ssize_t)zip->folder_outbytes_remaining)
3038                         bytes_avail = (ssize_t)zip->folder_outbytes_remaining;
3039                 zip->folder_outbytes_remaining -= bytes_avail;
3040                 zip->uncompressed_buffer_bytes_remaining = bytes_avail;
3041                 return (ARCHIVE_OK);
3042         }
3043
3044         /* If the buffer hasn't been allocated, allocate it now. */
3045         if (zip->uncompressed_buffer == NULL) {
3046                 zip->uncompressed_buffer_size = UBUFF_SIZE;
3047                 if (zip->uncompressed_buffer_size < minimum) {
3048                         zip->uncompressed_buffer_size = minimum + 1023;
3049                         zip->uncompressed_buffer_size &= ~0x3ff;
3050                 }
3051                 zip->uncompressed_buffer =
3052                     malloc(zip->uncompressed_buffer_size);
3053                 if (zip->uncompressed_buffer == NULL) {
3054                         archive_set_error(&a->archive, ENOMEM,
3055                             "No memory for 7-Zip decompression");
3056                         return (ARCHIVE_FATAL);
3057                 }
3058                 zip->uncompressed_buffer_bytes_remaining = 0;
3059         } else if (zip->uncompressed_buffer_size < minimum ||
3060             zip->uncompressed_buffer_bytes_remaining < minimum) {
3061                 /*
3062                  * Make sure the uncompressed buffer can have bytes
3063                  * at least `minimum' bytes.
3064                  * NOTE: This case happen when reading the header.
3065                  */
3066                 size_t used;
3067                 if (zip->uncompressed_buffer_pointer != 0)
3068                         used = zip->uncompressed_buffer_pointer -
3069                                 zip->uncompressed_buffer;
3070                 else
3071                         used = 0;
3072                 if (zip->uncompressed_buffer_size < minimum) {
3073                         /*
3074                          * Expand the uncompressed buffer up to
3075                          * the minimum size.
3076                          */
3077                         void *p;
3078                         size_t new_size;
3079
3080                         new_size = minimum + 1023;
3081                         new_size &= ~0x3ff;
3082                         p = realloc(zip->uncompressed_buffer, new_size);
3083                         if (p == NULL) {
3084                                 archive_set_error(&a->archive, ENOMEM,
3085                                     "No memory for 7-Zip decompression");
3086                                 return (ARCHIVE_FATAL);
3087                         }
3088                         zip->uncompressed_buffer = (unsigned char *)p;
3089                         zip->uncompressed_buffer_size = new_size;
3090                 }
3091                 /*
3092                  * Move unconsumed bytes to the head.
3093                  */
3094                 if (used) {
3095                         memmove(zip->uncompressed_buffer,
3096                                 zip->uncompressed_buffer + used,
3097                                 zip->uncompressed_buffer_bytes_remaining);
3098                 }
3099         } else
3100                 zip->uncompressed_buffer_bytes_remaining = 0;
3101         zip->uncompressed_buffer_pointer = NULL;
3102         for (;;) {
3103                 size_t bytes_in, bytes_out;
3104                 const void *buff_in;
3105                 unsigned char *buff_out;
3106                 int end_of_data;
3107
3108                 /*
3109                  * Note: '1' here is a performance optimization.
3110                  * Recall that the decompression layer returns a count of
3111                  * available bytes; asking for more than that forces the
3112                  * decompressor to combine reads by copying data.
3113                  */
3114                 buff_in = __archive_read_ahead(a, 1, &bytes_avail);
3115                 if (bytes_avail <= 0) {
3116                         archive_set_error(&a->archive,
3117                             ARCHIVE_ERRNO_FILE_FORMAT,
3118                             "Truncated 7-Zip file body");
3119                         return (ARCHIVE_FATAL);
3120                 }
3121
3122                 buff_out = zip->uncompressed_buffer
3123                         + zip->uncompressed_buffer_bytes_remaining;
3124                 bytes_out = zip->uncompressed_buffer_size
3125                         - zip->uncompressed_buffer_bytes_remaining;
3126                 bytes_in = bytes_avail;
3127                 if (bytes_in > zip->pack_stream_inbytes_remaining)
3128                         bytes_in = (size_t)zip->pack_stream_inbytes_remaining;
3129                 /* Drive decompression. */
3130                 r = decompress(a, zip, buff_out, &bytes_out,
3131                         buff_in, &bytes_in);
3132                 switch (r) {
3133                 case ARCHIVE_OK:
3134                         end_of_data = 0;
3135                         break;
3136                 case ARCHIVE_EOF:
3137                         end_of_data = 1;
3138                         break;
3139                 default:
3140                         return (ARCHIVE_FATAL);
3141                 }
3142                 zip->pack_stream_inbytes_remaining -= bytes_in;
3143                 if (bytes_out > zip->folder_outbytes_remaining)
3144                         bytes_out = (size_t)zip->folder_outbytes_remaining;
3145                 zip->folder_outbytes_remaining -= bytes_out;
3146                 zip->uncompressed_buffer_bytes_remaining += bytes_out;
3147                 zip->pack_stream_bytes_unconsumed = bytes_in;
3148
3149                 /*
3150                  * Continue decompression until uncompressed_buffer is full.
3151                  */
3152                 if (zip->uncompressed_buffer_bytes_remaining ==
3153                     zip->uncompressed_buffer_size)
3154                         break;
3155                 if (zip->codec2 == _7Z_X86 && zip->odd_bcj_size &&
3156                     zip->uncompressed_buffer_bytes_remaining + 5 >
3157                     zip->uncompressed_buffer_size)
3158                         break;
3159                 if (zip->pack_stream_inbytes_remaining == 0 &&
3160                     zip->folder_outbytes_remaining == 0)
3161                         break;
3162                 if (end_of_data || (bytes_in == 0 && bytes_out == 0)) {
3163                         archive_set_error(&(a->archive),
3164                             ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3165                         return (ARCHIVE_FATAL);
3166                 }
3167                 read_consume(a);
3168         }
3169         if (zip->uncompressed_buffer_bytes_remaining < minimum) {
3170                 archive_set_error(&(a->archive),
3171                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3172                 return (ARCHIVE_FATAL);
3173         }
3174         zip->uncompressed_buffer_pointer = zip->uncompressed_buffer;
3175         return (ARCHIVE_OK);
3176 }
3177
3178 static int
3179 seek_pack(struct archive_read *a)
3180 {
3181         struct _7zip *zip = (struct _7zip *)a->format->data;
3182         int64_t pack_offset;
3183
3184         if (zip->pack_stream_remaining <= 0) {
3185                 archive_set_error(&(a->archive),
3186                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3187                 return (ARCHIVE_FATAL);
3188         }
3189         zip->pack_stream_inbytes_remaining =
3190             zip->si.pi.sizes[zip->pack_stream_index];
3191         pack_offset = zip->si.pi.positions[zip->pack_stream_index];
3192         if (zip->stream_offset != pack_offset) {
3193                 if (0 > __archive_read_seek(a, pack_offset + zip->seek_base,
3194                     SEEK_SET))
3195                         return (ARCHIVE_FATAL);
3196                 zip->stream_offset = pack_offset;
3197         }
3198         zip->pack_stream_index++;
3199         zip->pack_stream_remaining--;
3200         return (ARCHIVE_OK);
3201 }
3202
3203 static ssize_t
3204 read_stream(struct archive_read *a, const void **buff, size_t size,
3205     size_t minimum)
3206 {
3207         struct _7zip *zip = (struct _7zip *)a->format->data;
3208         uint64_t skip_bytes = 0;
3209         ssize_t r;
3210
3211         if (zip->uncompressed_buffer_bytes_remaining == 0) {
3212                 if (zip->pack_stream_inbytes_remaining > 0) {
3213                         r = extract_pack_stream(a, 0);
3214                         if (r < 0)
3215                                 return (r);
3216                         return (get_uncompressed_data(a, buff, size, minimum));
3217                 } else if (zip->folder_outbytes_remaining > 0) {
3218                         /* Extract a remaining pack stream. */
3219                         r = extract_pack_stream(a, 0);
3220                         if (r < 0)
3221                                 return (r);
3222                         return (get_uncompressed_data(a, buff, size, minimum));
3223                 }
3224         } else
3225                 return (get_uncompressed_data(a, buff, size, minimum));
3226
3227         /*
3228          * Current pack stream has been consumed.
3229          */
3230         if (zip->pack_stream_remaining == 0) {
3231                 if (zip->header_is_being_read) {
3232                         /* Invalid sequence. This might happen when
3233                          * reading a malformed archive. */
3234                         archive_set_error(&(a->archive),
3235                             ARCHIVE_ERRNO_MISC, "Malformed 7-Zip archive");
3236                         return (ARCHIVE_FATAL);
3237                 }
3238
3239                 /*
3240                  * All current folder's pack streams have been
3241                  * consumed. Switch to next folder.
3242                  */
3243                 if (zip->folder_index == 0 &&
3244                     (zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes
3245                      || zip->folder_index != zip->entry->folderIndex)) {
3246                         zip->folder_index = zip->entry->folderIndex;
3247                         skip_bytes =
3248                             zip->si.ci.folders[zip->folder_index].skipped_bytes;
3249                 }
3250
3251                 if (zip->folder_index >= zip->si.ci.numFolders) {
3252                         /*
3253                          * We have consumed all folders and its pack streams.
3254                          */
3255                         *buff = NULL;
3256                         return (0);
3257                 }
3258                 r = setup_decode_folder(a,
3259                         &(zip->si.ci.folders[zip->folder_index]), 0);
3260                 if (r != ARCHIVE_OK)
3261                         return (ARCHIVE_FATAL);
3262
3263                 zip->folder_index++;
3264         }
3265
3266         /*
3267          * Switch to next pack stream.
3268          */
3269         r = seek_pack(a);
3270         if (r < 0)
3271                 return (r);
3272
3273         /* Extract a new pack stream. */
3274         r = extract_pack_stream(a, 0);
3275         if (r < 0)
3276                 return (r);
3277
3278         /*
3279          * Skip the bytes we already has skipped in skip_stream().
3280          */
3281         while (skip_bytes) {
3282                 ssize_t skipped;
3283
3284                 if (zip->uncompressed_buffer_bytes_remaining == 0) {
3285                         if (zip->pack_stream_inbytes_remaining > 0) {
3286                                 r = extract_pack_stream(a, 0);
3287                                 if (r < 0)
3288                                         return (r);
3289                         } else if (zip->folder_outbytes_remaining > 0) {
3290                                 /* Extract a remaining pack stream. */
3291                                 r = extract_pack_stream(a, 0);
3292                                 if (r < 0)
3293                                         return (r);
3294                         } else {
3295                                 archive_set_error(&a->archive,
3296                                     ARCHIVE_ERRNO_FILE_FORMAT,
3297                                     "Truncated 7-Zip file body");
3298                                 return (ARCHIVE_FATAL);
3299                         }
3300                 }
3301                 skipped = get_uncompressed_data(
3302                         a, buff, (size_t)skip_bytes, 0);
3303                 if (skipped < 0)
3304                         return (skipped);
3305                 skip_bytes -= skipped;
3306                 if (zip->pack_stream_bytes_unconsumed)
3307                         read_consume(a);
3308         }
3309
3310         return (get_uncompressed_data(a, buff, size, minimum));
3311 }
3312
3313 static int
3314 setup_decode_folder(struct archive_read *a, struct _7z_folder *folder,
3315     int header)
3316 {
3317         struct _7zip *zip = (struct _7zip *)a->format->data;
3318         const struct _7z_coder *coder1, *coder2;
3319         const char *cname = (header)?"archive header":"file content";
3320         unsigned i;
3321         int r, found_bcj2 = 0;
3322
3323         /*
3324          * Release the memory which the previous folder used for BCJ2.
3325          */
3326         for (i = 0; i < 3; i++) {
3327                 free(zip->sub_stream_buff[i]);
3328                 zip->sub_stream_buff[i] = NULL;
3329         }
3330
3331         /*
3332          * Initialize a stream reader.
3333          */
3334         zip->pack_stream_remaining = (unsigned)folder->numPackedStreams;
3335         zip->pack_stream_index = (unsigned)folder->packIndex;
3336         zip->folder_outbytes_remaining = folder_uncompressed_size(folder);
3337         zip->uncompressed_buffer_bytes_remaining = 0;
3338
3339         /*
3340          * Check coder types.
3341          */
3342         for (i = 0; i < folder->numCoders; i++) {
3343                 switch(folder->coders[i].codec) {
3344                         case _7Z_CRYPTO_MAIN_ZIP:
3345                         case _7Z_CRYPTO_RAR_29:
3346                         case _7Z_CRYPTO_AES_256_SHA_256: {
3347                                 /* For entry that is associated with this folder, mark
3348                                    it as encrypted (data+metadata). */
3349                                 zip->has_encrypted_entries = 1;
3350                                 if (a->entry) {
3351                                         archive_entry_set_is_data_encrypted(a->entry, 1);
3352                                         archive_entry_set_is_metadata_encrypted(a->entry, 1);
3353                                 }
3354                                 archive_set_error(&(a->archive),
3355                                         ARCHIVE_ERRNO_MISC,
3356                                         "The %s is encrypted, "
3357                                         "but currently not supported", cname);
3358                                 return (ARCHIVE_FATAL);
3359                         }
3360                         case _7Z_X86_BCJ2: {
3361                                 found_bcj2++;
3362                                 break;
3363                         }
3364                 }
3365         }
3366         /* Now that we've checked for encryption, if there were still no
3367          * encrypted entries found we can say for sure that there are none.
3368          */
3369         if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
3370                 zip->has_encrypted_entries = 0;
3371         }
3372
3373         if ((folder->numCoders > 2 && !found_bcj2) || found_bcj2 > 1) {
3374                 archive_set_error(&(a->archive),
3375                     ARCHIVE_ERRNO_MISC,
3376                     "The %s is encoded with many filters, "
3377                     "but currently not supported", cname);
3378                 return (ARCHIVE_FATAL);
3379         }
3380         coder1 = &(folder->coders[0]);
3381         if (folder->numCoders == 2)
3382                 coder2 = &(folder->coders[1]);
3383         else
3384                 coder2 = NULL;
3385
3386         if (found_bcj2) {
3387                 /*
3388                  * Preparation to decode BCJ2.
3389                  * Decoding BCJ2 requires four sources. Those are at least,
3390                  * as far as I know, two types of the storage form.
3391                  */
3392                 const struct _7z_coder *fc = folder->coders;
3393                 static const struct _7z_coder coder_copy = {0, 1, 1, 0, NULL};
3394                 const struct _7z_coder *scoder[3] =
3395                         {&coder_copy, &coder_copy, &coder_copy};
3396                 const void *buff;
3397                 ssize_t bytes;
3398                 unsigned char *b[3] = {NULL, NULL, NULL};
3399                 uint64_t sunpack[3] ={-1, -1, -1};
3400                 size_t s[3] = {0, 0, 0};
3401                 int idx[3] = {0, 1, 2};
3402
3403                 if (folder->numCoders == 4 && fc[3].codec == _7Z_X86_BCJ2 &&
3404                     folder->numInStreams == 7 && folder->numOutStreams == 4 &&
3405                     zip->pack_stream_remaining == 4) {
3406                         /* Source type 1 made by 7zr or 7z with -m options. */
3407                         if (folder->bindPairs[0].inIndex == 5) {
3408                                 /* The form made by 7zr */
3409                                 idx[0] = 1; idx[1] = 2; idx[2] = 0;
3410                                 scoder[1] = &(fc[1]);
3411                                 scoder[2] = &(fc[0]);
3412                                 sunpack[1] = folder->unPackSize[1];
3413                                 sunpack[2] = folder->unPackSize[0];
3414                                 coder1 = &(fc[2]);
3415                         } else {
3416                                 /*
3417                                  * NOTE: Some patterns do not work.
3418                                  * work:
3419                                  *  7z a -m0=BCJ2 -m1=COPY -m2=COPY
3420                                  *       -m3=(any)
3421                                  *  7z a -m0=BCJ2 -m1=COPY -m2=(any)
3422                                  *       -m3=COPY
3423                                  *  7z a -m0=BCJ2 -m1=(any) -m2=COPY
3424                                  *       -m3=COPY
3425                                  * not work:
3426                                  *  other patterns.
3427                                  *
3428                                  * We have to handle this like `pipe' or
3429                                  * our libarchive7s filter frame work,
3430                                  * decoding the BCJ2 main stream sequentially,
3431                                  * m3 -> m2 -> m1 -> BCJ2.
3432                                  *
3433                                  */
3434                                 if (fc[0].codec == _7Z_COPY &&
3435                                     fc[1].codec == _7Z_COPY)
3436                                         coder1 = &(folder->coders[2]);
3437                                 else if (fc[0].codec == _7Z_COPY &&
3438                                     fc[2].codec == _7Z_COPY)
3439                                         coder1 = &(folder->coders[1]);
3440                                 else if (fc[1].codec == _7Z_COPY &&
3441                                     fc[2].codec == _7Z_COPY)
3442                                         coder1 = &(folder->coders[0]);
3443                                 else {
3444                                         archive_set_error(&(a->archive),
3445                                             ARCHIVE_ERRNO_MISC,
3446                                             "Unsupported form of "
3447                                             "BCJ2 streams");
3448                                         return (ARCHIVE_FATAL);
3449                                 }
3450                         }
3451                         coder2 = &(fc[3]);
3452                         zip->main_stream_bytes_remaining =
3453                                 (size_t)folder->unPackSize[2];
3454                 } else if (coder2 != NULL && coder2->codec == _7Z_X86_BCJ2 &&
3455                     zip->pack_stream_remaining == 4 &&
3456                     folder->numInStreams == 5 && folder->numOutStreams == 2) {
3457                         /* Source type 0 made by 7z */
3458                         zip->main_stream_bytes_remaining =
3459                                 (size_t)folder->unPackSize[0];
3460                 } else {
3461                         /* We got an unexpected form. */
3462                         archive_set_error(&(a->archive),
3463                             ARCHIVE_ERRNO_MISC,
3464                             "Unsupported form of BCJ2 streams");
3465                         return (ARCHIVE_FATAL);
3466                 }
3467
3468                 /* Skip the main stream at this time. */
3469                 if ((r = seek_pack(a)) < 0)
3470                         return (r);
3471                 zip->pack_stream_bytes_unconsumed =
3472                     (size_t)zip->pack_stream_inbytes_remaining;
3473                 read_consume(a);
3474
3475                 /* Read following three sub streams. */
3476                 for (i = 0; i < 3; i++) {
3477                         const struct _7z_coder *coder = scoder[i];
3478
3479                         if ((r = seek_pack(a)) < 0) {
3480                                 free(b[0]); free(b[1]); free(b[2]);
3481                                 return (r);
3482                         }
3483
3484                         if (sunpack[i] == (uint64_t)-1)
3485                                 zip->folder_outbytes_remaining =
3486                                     zip->pack_stream_inbytes_remaining;
3487                         else
3488                                 zip->folder_outbytes_remaining = sunpack[i];
3489
3490                         r = init_decompression(a, zip, coder, NULL);
3491                         if (r != ARCHIVE_OK) {
3492                                 free(b[0]); free(b[1]); free(b[2]);
3493                                 return (ARCHIVE_FATAL);
3494                         }
3495
3496                         /* Allocate memory for the decoded data of a sub
3497                          * stream. */
3498                         b[i] = malloc((size_t)zip->folder_outbytes_remaining);
3499                         if (b[i] == NULL) {
3500                                 free(b[0]); free(b[1]); free(b[2]);
3501                                 archive_set_error(&a->archive, ENOMEM,
3502                                     "No memory for 7-Zip decompression");
3503                                 return (ARCHIVE_FATAL);
3504                         }
3505
3506                         /* Extract a sub stream. */
3507                         while (zip->pack_stream_inbytes_remaining > 0) {
3508                                 r = (int)extract_pack_stream(a, 0);
3509                                 if (r < 0) {
3510                                         free(b[0]); free(b[1]); free(b[2]);
3511                                         return (r);
3512                                 }
3513                                 bytes = get_uncompressed_data(a, &buff,
3514                                     zip->uncompressed_buffer_bytes_remaining,
3515                                     0);
3516                                 if (bytes < 0) {
3517                                         free(b[0]); free(b[1]); free(b[2]);
3518                                         return ((int)bytes);
3519                                 }
3520                                 memcpy(b[i]+s[i], buff, bytes);
3521                                 s[i] += bytes;
3522                                 if (zip->pack_stream_bytes_unconsumed)
3523                                         read_consume(a);
3524                         }
3525                 }
3526
3527                 /* Set the sub streams to the right place. */
3528                 for (i = 0; i < 3; i++) {
3529                         zip->sub_stream_buff[i] = b[idx[i]];
3530                         zip->sub_stream_size[i] = s[idx[i]];
3531                         zip->sub_stream_bytes_remaining[i] = s[idx[i]];
3532                 }
3533
3534                 /* Allocate memory used for decoded main stream bytes. */
3535                 if (zip->tmp_stream_buff == NULL) {
3536                         zip->tmp_stream_buff_size = 32 * 1024;
3537                         zip->tmp_stream_buff =
3538                             malloc(zip->tmp_stream_buff_size);
3539                         if (zip->tmp_stream_buff == NULL) {
3540                                 archive_set_error(&a->archive, ENOMEM,
3541                                     "No memory for 7-Zip decompression");
3542                                 return (ARCHIVE_FATAL);
3543                         }
3544                 }
3545                 zip->tmp_stream_bytes_avail = 0;
3546                 zip->tmp_stream_bytes_remaining = 0;
3547                 zip->odd_bcj_size = 0;
3548                 zip->bcj2_outPos = 0;
3549
3550                 /*
3551                  * Reset a stream reader in order to read the main stream
3552                  * of BCJ2.
3553                  */
3554                 zip->pack_stream_remaining = 1;
3555                 zip->pack_stream_index = (unsigned)folder->packIndex;
3556                 zip->folder_outbytes_remaining =
3557                     folder_uncompressed_size(folder);
3558                 zip->uncompressed_buffer_bytes_remaining = 0;
3559         }
3560
3561         /*
3562          * Initialize the decompressor for the new folder's pack streams.
3563          */
3564         r = init_decompression(a, zip, coder1, coder2);
3565         if (r != ARCHIVE_OK)
3566                 return (ARCHIVE_FATAL);
3567         return (ARCHIVE_OK);
3568 }
3569
3570 static int64_t
3571 skip_stream(struct archive_read *a, size_t skip_bytes)
3572 {
3573         struct _7zip *zip = (struct _7zip *)a->format->data;
3574         const void *p;
3575         int64_t skipped_bytes;
3576         size_t bytes = skip_bytes;
3577
3578         if (zip->folder_index == 0) {
3579                 /*
3580                  * Optimization for a list mode.
3581                  * Avoid unnecessary decoding operations.
3582                  */
3583                 zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes
3584                     += skip_bytes;
3585                 return (skip_bytes);
3586         }
3587
3588         while (bytes) {
3589                 skipped_bytes = read_stream(a, &p, bytes, 0);
3590                 if (skipped_bytes < 0)
3591                         return (skipped_bytes);
3592                 if (skipped_bytes == 0) {
3593                         archive_set_error(&a->archive,
3594                             ARCHIVE_ERRNO_FILE_FORMAT,
3595                             "Truncated 7-Zip file body");
3596                         return (ARCHIVE_FATAL);
3597                 }
3598                 bytes -= (size_t)skipped_bytes;
3599                 if (zip->pack_stream_bytes_unconsumed)
3600                         read_consume(a);
3601         }
3602         return (skip_bytes);
3603 }
3604
3605 /*
3606  * Brought from LZMA SDK.
3607  *
3608  * Bra86.c -- Converter for x86 code (BCJ)
3609  * 2008-10-04 : Igor Pavlov : Public domain
3610  *
3611  */
3612
3613 #define Test86MSByte(b) ((b) == 0 || (b) == 0xFF)
3614
3615 static void
3616 x86_Init(struct _7zip *zip)
3617 {
3618         zip->bcj_state = 0;
3619         zip->bcj_prevPosT = (size_t)0 - 1;
3620         zip->bcj_prevMask = 0;
3621         zip->bcj_ip = 5;
3622 }
3623
3624 static size_t
3625 x86_Convert(struct _7zip *zip, uint8_t *data, size_t size)
3626 {
3627         static const uint8_t kMaskToAllowedStatus[8] = {1, 1, 1, 0, 1, 0, 0, 0};
3628         static const uint8_t kMaskToBitNumber[8] = {0, 1, 2, 2, 3, 3, 3, 3};
3629         size_t bufferPos, prevPosT;
3630         uint32_t ip, prevMask;
3631
3632         if (size < 5)
3633                 return 0;
3634
3635         bufferPos = 0;
3636         prevPosT = zip->bcj_prevPosT;
3637         prevMask = zip->bcj_prevMask;
3638         ip = zip->bcj_ip;
3639
3640         for (;;) {
3641                 uint8_t *p = data + bufferPos;
3642                 uint8_t *limit = data + size - 4;
3643
3644                 for (; p < limit; p++)
3645                         if ((*p & 0xFE) == 0xE8)
3646                                 break;
3647                 bufferPos = (size_t)(p - data);
3648                 if (p >= limit)
3649                         break;
3650                 prevPosT = bufferPos - prevPosT;
3651                 if (prevPosT > 3)
3652                         prevMask = 0;
3653                 else {
3654                         prevMask = (prevMask << ((int)prevPosT - 1)) & 0x7;
3655                         if (prevMask != 0) {
3656                                 unsigned char b =
3657                                         p[4 - kMaskToBitNumber[prevMask]];
3658                                 if (!kMaskToAllowedStatus[prevMask] ||
3659                                     Test86MSByte(b)) {
3660                                         prevPosT = bufferPos;
3661                                         prevMask = ((prevMask << 1) & 0x7) | 1;
3662                                         bufferPos++;
3663                                         continue;
3664                                 }
3665                         }
3666                 }
3667                 prevPosT = bufferPos;
3668
3669                 if (Test86MSByte(p[4])) {
3670                         uint32_t src = ((uint32_t)p[4] << 24) |
3671                                 ((uint32_t)p[3] << 16) | ((uint32_t)p[2] << 8) |
3672                                 ((uint32_t)p[1]);
3673                         uint32_t dest;
3674                         for (;;) {
3675                                 uint8_t b;
3676                                 int b_index;
3677
3678                                 dest = src - (ip + (uint32_t)bufferPos);
3679                                 if (prevMask == 0)
3680                                         break;
3681                                 b_index = kMaskToBitNumber[prevMask] * 8;
3682                                 b = (uint8_t)(dest >> (24 - b_index));
3683                                 if (!Test86MSByte(b))
3684                                         break;
3685                                 src = dest ^ ((1 << (32 - b_index)) - 1);
3686                         }
3687                         p[4] = (uint8_t)(~(((dest >> 24) & 1) - 1));
3688                         p[3] = (uint8_t)(dest >> 16);
3689                         p[2] = (uint8_t)(dest >> 8);
3690                         p[1] = (uint8_t)dest;
3691                         bufferPos += 5;
3692                 } else {
3693                         prevMask = ((prevMask << 1) & 0x7) | 1;
3694                         bufferPos++;
3695                 }
3696         }
3697         zip->bcj_prevPosT = prevPosT;
3698         zip->bcj_prevMask = prevMask;
3699         zip->bcj_ip += (uint32_t)bufferPos;
3700         return (bufferPos);
3701 }
3702
3703 /*
3704  * Brought from LZMA SDK.
3705  *
3706  * Bcj2.c -- Converter for x86 code (BCJ2)
3707  * 2008-10-04 : Igor Pavlov : Public domain
3708  *
3709  */
3710
3711 #define SZ_ERROR_DATA    ARCHIVE_FAILED
3712
3713 #define IsJcc(b0, b1) ((b0) == 0x0F && ((b1) & 0xF0) == 0x80)
3714 #define IsJ(b0, b1) ((b1 & 0xFE) == 0xE8 || IsJcc(b0, b1))
3715
3716 #define kNumTopBits 24
3717 #define kTopValue ((uint32_t)1 << kNumTopBits)
3718
3719 #define kNumBitModelTotalBits 11
3720 #define kBitModelTotal (1 << kNumBitModelTotalBits)
3721 #define kNumMoveBits 5
3722
3723 #define RC_READ_BYTE (*buffer++)
3724 #define RC_TEST { if (buffer == bufferLim) return SZ_ERROR_DATA; }
3725 #define RC_INIT2 zip->bcj2_code = 0; zip->bcj2_range = 0xFFFFFFFF; \
3726   { int ii; for (ii = 0; ii < 5; ii++) { RC_TEST; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; }}
3727
3728 #define NORMALIZE if (zip->bcj2_range < kTopValue) { RC_TEST; zip->bcj2_range <<= 8; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; }
3729
3730 #define IF_BIT_0(p) ttt = *(p); bound = (zip->bcj2_range >> kNumBitModelTotalBits) * ttt; if (zip->bcj2_code < bound)
3731 #define UPDATE_0(p) zip->bcj2_range = bound; *(p) = (CProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits)); NORMALIZE;
3732 #define UPDATE_1(p) zip->bcj2_range -= bound; zip->bcj2_code -= bound; *(p) = (CProb)(ttt - (ttt >> kNumMoveBits)); NORMALIZE;
3733
3734 static ssize_t
3735 Bcj2_Decode(struct _7zip *zip, uint8_t *outBuf, size_t outSize)
3736 {
3737         size_t inPos = 0, outPos = 0;
3738         const uint8_t *buf0, *buf1, *buf2, *buf3;
3739         size_t size0, size1, size2, size3;
3740         const uint8_t *buffer, *bufferLim;
3741         unsigned int i, j;
3742
3743         size0 = zip->tmp_stream_bytes_remaining;
3744         buf0 = zip->tmp_stream_buff + zip->tmp_stream_bytes_avail - size0;
3745         size1 = zip->sub_stream_bytes_remaining[0];
3746         buf1 = zip->sub_stream_buff[0] + zip->sub_stream_size[0] - size1;
3747         size2 = zip->sub_stream_bytes_remaining[1];
3748         buf2 = zip->sub_stream_buff[1] + zip->sub_stream_size[1] - size2;
3749         size3 = zip->sub_stream_bytes_remaining[2];
3750         buf3 = zip->sub_stream_buff[2] + zip->sub_stream_size[2] - size3;
3751
3752         buffer = buf3;
3753         bufferLim = buffer + size3;
3754
3755         if (zip->bcj_state == 0) {
3756                 /*
3757                  * Initialize.
3758                  */
3759                 zip->bcj2_prevByte = 0;
3760                 for (i = 0;
3761                     i < sizeof(zip->bcj2_p) / sizeof(zip->bcj2_p[0]); i++)
3762                         zip->bcj2_p[i] = kBitModelTotal >> 1;
3763                 RC_INIT2;
3764                 zip->bcj_state = 1;
3765         }
3766
3767         /*
3768          * Gather the odd bytes of a previous call.
3769          */
3770         for (i = 0; zip->odd_bcj_size > 0 && outPos < outSize; i++) {
3771                 outBuf[outPos++] = zip->odd_bcj[i];
3772                 zip->odd_bcj_size--;
3773         }
3774
3775         if (outSize == 0) {
3776                 zip->bcj2_outPos += outPos;
3777                 return (outPos);
3778         }
3779
3780         for (;;) {
3781                 uint8_t b;
3782                 CProb *prob;
3783                 uint32_t bound;
3784                 uint32_t ttt;
3785
3786                 size_t limit = size0 - inPos;
3787                 if (outSize - outPos < limit)
3788                         limit = outSize - outPos;
3789
3790                 if (zip->bcj_state == 1) {
3791                         while (limit != 0) {
3792                                 uint8_t bb = buf0[inPos];
3793                                 outBuf[outPos++] = bb;
3794                                 if (IsJ(zip->bcj2_prevByte, bb)) {
3795                                         zip->bcj_state = 2;
3796                                         break;
3797                                 }
3798                                 inPos++;
3799                                 zip->bcj2_prevByte = bb;
3800                                 limit--;
3801                         }
3802                 }
3803
3804                 if (limit == 0 || outPos == outSize)
3805                         break;
3806                 zip->bcj_state = 1;
3807
3808                 b = buf0[inPos++];
3809
3810                 if (b == 0xE8)
3811                         prob = zip->bcj2_p + zip->bcj2_prevByte;
3812                 else if (b == 0xE9)
3813                         prob = zip->bcj2_p + 256;
3814                 else
3815                         prob = zip->bcj2_p + 257;
3816
3817                 IF_BIT_0(prob) {
3818                         UPDATE_0(prob)
3819                         zip->bcj2_prevByte = b;
3820                 } else {
3821                         uint32_t dest;
3822                         const uint8_t *v;
3823                         uint8_t out[4];
3824
3825                         UPDATE_1(prob)
3826                         if (b == 0xE8) {
3827                                 v = buf1;
3828                                 if (size1 < 4)
3829                                         return SZ_ERROR_DATA;
3830                                 buf1 += 4;
3831                                 size1 -= 4;
3832                         } else {
3833                                 v = buf2;
3834                                 if (size2 < 4)
3835                                         return SZ_ERROR_DATA;
3836                                 buf2 += 4;
3837                                 size2 -= 4;
3838                         }
3839                         dest = (((uint32_t)v[0] << 24) |
3840                             ((uint32_t)v[1] << 16) |
3841                             ((uint32_t)v[2] << 8) |
3842                             ((uint32_t)v[3])) -
3843                             ((uint32_t)zip->bcj2_outPos + (uint32_t)outPos + 4);
3844                         out[0] = (uint8_t)dest;
3845                         out[1] = (uint8_t)(dest >> 8);
3846                         out[2] = (uint8_t)(dest >> 16);
3847                         out[3] = zip->bcj2_prevByte = (uint8_t)(dest >> 24);
3848
3849                         for (i = 0; i < 4 && outPos < outSize; i++)
3850                                 outBuf[outPos++] = out[i];
3851                         if (i < 4) {
3852                                 /*
3853                                  * Save odd bytes which we could not add into
3854                                  * the output buffer because of out of space.
3855                                  */
3856                                 zip->odd_bcj_size = 4 -i;
3857                                 for (; i < 4; i++) {
3858                                         j = i - 4 + (unsigned)zip->odd_bcj_size;
3859                                         zip->odd_bcj[j] = out[i];
3860                                 }
3861                                 break;
3862                         }
3863                 }
3864         }
3865         zip->tmp_stream_bytes_remaining -= inPos;
3866         zip->sub_stream_bytes_remaining[0] = size1;
3867         zip->sub_stream_bytes_remaining[1] = size2;
3868         zip->sub_stream_bytes_remaining[2] = bufferLim - buffer;
3869         zip->bcj2_outPos += outPos;
3870
3871         return ((ssize_t)outPos);
3872 }
3873