Utilities/cmlibarchive/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 <cm3p/bzlib.h>
  37 #endif
  38 #ifdef HAVE_LZMA_H
  39 #include <cm3p/lzma.h>
  40 #endif
  41 #ifdef HAVE_ZLIB_H
  42 #include <cm3p/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         const uint64_t max_read_size = 16 * 1024 * 1024;  // Don't try to read more than 16 MB at a time
 812         size_t bytes_to_read = max_read_size;
 813         if ((uint64_t)bytes_to_read > zip->entry_bytes_remaining) {
 814                 bytes_to_read = zip->entry_bytes_remaining;
 815         }
 816         bytes = read_stream(a, buff, bytes_to_read, 0);
 817         if (bytes < 0)
 818                 return ((int)bytes);
 819         if (bytes == 0) {
 820                 archive_set_error(&a->archive,
 821                     ARCHIVE_ERRNO_FILE_FORMAT,
 822                     "Truncated 7-Zip file body");
 823                 return (ARCHIVE_FATAL);
 824         }
 825         zip->entry_bytes_remaining -= bytes;
 826         if (zip->entry_bytes_remaining == 0)
 827                 zip->end_of_entry = 1;
 828
 829         /* Update checksum */
 830         if ((zip->entry->flg & CRC32_IS_SET) && bytes)
 831                 zip->entry_crc32 = crc32(zip->entry_crc32, *buff,
 832                     (unsigned)bytes);
 833
 834         /* If we hit the end, swallow any end-of-data marker. */
 835         if (zip->end_of_entry) {
 836                 /* Check computed CRC against file contents. */
 837                 if ((zip->entry->flg & CRC32_IS_SET) &&
 838                         zip->si.ss.digests[zip->entry->ssIndex] !=
 839                     zip->entry_crc32) {
 840                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 841                             "7-Zip bad CRC: 0x%lx should be 0x%lx",
 842                             (unsigned long)zip->entry_crc32,
 843                             (unsigned long)zip->si.ss.digests[
 844                                         zip->entry->ssIndex]);
 845                         ret = ARCHIVE_WARN;
 846                 }
 847         }
 848
 849         *size = bytes;
 850         *offset = zip->entry_offset;
 851         zip->entry_offset += bytes;
 852
 853         return (ret);
 854 }
 855
 856 static int
 857 archive_read_format_7zip_read_data_skip(struct archive_read *a)
 858 {
 859         struct _7zip *zip;
 860         int64_t bytes_skipped;
 861
 862         zip = (struct _7zip *)(a->format->data);
 863
 864         if (zip->pack_stream_bytes_unconsumed)
 865                 read_consume(a);
 866
 867         /* If we've already read to end of data, we're done. */
 868         if (zip->end_of_entry)
 869                 return (ARCHIVE_OK);
 870
 871         /*
 872          * If the length is at the beginning, we can skip the
 873          * compressed data much more quickly.
 874          */
 875         bytes_skipped = skip_stream(a, (size_t)zip->entry_bytes_remaining);
 876         if (bytes_skipped < 0)
 877                 return (ARCHIVE_FATAL);
 878         zip->entry_bytes_remaining = 0;
 879
 880         /* This entry is finished and done. */
 881         zip->end_of_entry = 1;
 882         return (ARCHIVE_OK);
 883 }
 884
 885 static int
 886 archive_read_format_7zip_cleanup(struct archive_read *a)
 887 {
 888         struct _7zip *zip;
 889
 890         zip = (struct _7zip *)(a->format->data);
 891         free_StreamsInfo(&(zip->si));
 892         free(zip->entries);
 893         free(zip->entry_names);
 894         free_decompression(a, zip);
 895         free(zip->uncompressed_buffer);
 896         free(zip->sub_stream_buff[0]);
 897         free(zip->sub_stream_buff[1]);
 898         free(zip->sub_stream_buff[2]);
 899         free(zip->tmp_stream_buff);
 900         free(zip);
 901         (a->format->data) = NULL;
 902         return (ARCHIVE_OK);
 903 }
 904
 905 static void
 906 read_consume(struct archive_read *a)
 907 {
 908         struct _7zip *zip = (struct _7zip *)a->format->data;
 909
 910         if (zip->pack_stream_bytes_unconsumed) {
 911                 __archive_read_consume(a, zip->pack_stream_bytes_unconsumed);
 912                 zip->stream_offset += zip->pack_stream_bytes_unconsumed;
 913                 zip->pack_stream_bytes_unconsumed = 0;
 914         }
 915 }
 916
 917 #ifdef HAVE_LZMA_H
 918
 919 /*
 920  * Set an error code and choose an error message for liblzma.
 921  */
 922 static void
 923 set_error(struct archive_read *a, int ret)
 924 {
 925
 926         switch (ret) {
 927         case LZMA_STREAM_END: /* Found end of stream. */
 928         case LZMA_OK: /* Decompressor made some progress. */
 929                 break;
 930         case LZMA_MEM_ERROR:
 931                 archive_set_error(&a->archive, ENOMEM,
 932                     "Lzma library error: Cannot allocate memory");
 933                 break;
 934         case LZMA_MEMLIMIT_ERROR:
 935                 archive_set_error(&a->archive, ENOMEM,
 936                     "Lzma library error: Out of memory");
 937                 break;
 938         case LZMA_FORMAT_ERROR:
 939                 archive_set_error(&a->archive,
 940                     ARCHIVE_ERRNO_MISC,
 941                     "Lzma library error: format not recognized");
 942                 break;
 943         case LZMA_OPTIONS_ERROR:
 944                 archive_set_error(&a->archive,
 945                     ARCHIVE_ERRNO_MISC,
 946                     "Lzma library error: Invalid options");
 947                 break;
 948         case LZMA_DATA_ERROR:
 949                 archive_set_error(&a->archive,
 950                     ARCHIVE_ERRNO_MISC,
 951                     "Lzma library error: Corrupted input data");
 952                 break;
 953         case LZMA_BUF_ERROR:
 954                 archive_set_error(&a->archive,
 955                     ARCHIVE_ERRNO_MISC,
 956                     "Lzma library error:  No progress is possible");
 957                 break;
 958         default:
 959                 /* Return an error. */
 960                 archive_set_error(&a->archive,
 961                     ARCHIVE_ERRNO_MISC,
 962                     "Lzma decompression failed:  Unknown error");
 963                 break;
 964         }
 965 }
 966
 967 #endif
 968
 969 static unsigned long
 970 decode_codec_id(const unsigned char *codecId, size_t id_size)
 971 {
 972         unsigned i;
 973         unsigned long id = 0;
 974
 975         for (i = 0; i < id_size; i++) {
 976                 id <<= 8;
 977                 id += codecId[i];
 978         }
 979         return (id);
 980 }
 981
 982 static Byte
 983 ppmd_read(void *p)
 984 {
 985         struct archive_read *a = ((IByteIn*)p)->a;
 986         struct _7zip *zip = (struct _7zip *)(a->format->data);
 987         Byte b;
 988
 989         if (zip->ppstream.avail_in == 0) {
 990                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 991                     "Truncated RAR file data");
 992                 zip->ppstream.overconsumed = 1;
 993                 return (0);
 994         }
 995         b = *zip->ppstream.next_in++;
 996         zip->ppstream.avail_in--;
 997         zip->ppstream.total_in++;
 998         return (b);
 999 }
1000
1001 static int
1002 init_decompression(struct archive_read *a, struct _7zip *zip,
1003     const struct _7z_coder *coder1, const struct _7z_coder *coder2)
1004 {
1005         int r;
1006
1007         zip->codec = coder1->codec;
1008         zip->codec2 = -1;
1009
1010         switch (zip->codec) {
1011         case _7Z_COPY:
1012         case _7Z_BZ2:
1013         case _7Z_DEFLATE:
1014         case _7Z_PPMD:
1015                 if (coder2 != NULL) {
1016                         if (coder2->codec != _7Z_X86 &&
1017                             coder2->codec != _7Z_X86_BCJ2) {
1018                                 archive_set_error(&a->archive,
1019                                     ARCHIVE_ERRNO_MISC,
1020                                     "Unsupported filter %lx for %lx",
1021                                     coder2->codec, coder1->codec);
1022                                 return (ARCHIVE_FAILED);
1023                         }
1024                         zip->codec2 = coder2->codec;
1025                         zip->bcj_state = 0;
1026                         if (coder2->codec == _7Z_X86)
1027                                 x86_Init(zip);
1028                 }
1029                 break;
1030         default:
1031                 break;
1032         }
1033
1034         switch (zip->codec) {
1035         case _7Z_COPY:
1036                 break;
1037
1038         case _7Z_LZMA: case _7Z_LZMA2:
1039 #ifdef HAVE_LZMA_H
1040 #if LZMA_VERSION_MAJOR >= 5
1041 /* Effectively disable the limiter. */
1042 #define LZMA_MEMLIMIT   UINT64_MAX
1043 #else
1044 /* NOTE: This needs to check memory size which running system has. */
1045 #define LZMA_MEMLIMIT   (1U << 30)
1046 #endif
1047         {
1048                 lzma_options_delta delta_opt;
1049                 lzma_filter filters[LZMA_FILTERS_MAX], *ff;
1050                 int fi = 0;
1051
1052                 if (zip->lzstream_valid) {
1053                         lzma_end(&(zip->lzstream));
1054                         zip->lzstream_valid = 0;
1055                 }
1056
1057                 /*
1058                  * NOTE: liblzma incompletely handle the BCJ+LZMA compressed
1059                  * data made by 7-Zip because 7-Zip does not add End-Of-
1060                  * Payload Marker(EOPM) at the end of LZMA compressed data,
1061                  * and so liblzma cannot know the end of the compressed data
1062                  * without EOPM. So consequently liblzma will not return last
1063                  * three or four bytes of uncompressed data because
1064                  * LZMA_FILTER_X86 filter does not handle input data if its
1065                  * data size is less than five bytes. If liblzma detect EOPM
1066                  * or know the uncompressed data size, liblzma will flush out
1067                  * the remaining that three or four bytes of uncompressed
1068                  * data. That is why we have to use our converting program
1069                  * for BCJ+LZMA. If we were able to tell the uncompressed
1070                  * size to liblzma when using lzma_raw_decoder() liblzma
1071                  * could correctly deal with BCJ+LZMA. But unfortunately
1072                  * there is no way to do that.
1073                  * Discussion about this can be found at XZ Utils forum.
1074                  */
1075                 if (coder2 != NULL) {
1076                         zip->codec2 = coder2->codec;
1077
1078                         filters[fi].options = NULL;
1079                         switch (zip->codec2) {
1080                         case _7Z_X86:
1081                                 if (zip->codec == _7Z_LZMA2) {
1082                                         filters[fi].id = LZMA_FILTER_X86;
1083                                         fi++;
1084                                 } else
1085                                         /* Use our filter. */
1086                                         x86_Init(zip);
1087                                 break;
1088                         case _7Z_X86_BCJ2:
1089                                 /* Use our filter. */
1090                                 zip->bcj_state = 0;
1091                                 break;
1092                         case _7Z_DELTA:
1093                                 if (coder2->propertiesSize != 1) {
1094                                         archive_set_error(&a->archive,
1095                                             ARCHIVE_ERRNO_MISC,
1096                                             "Invalid Delta parameter");
1097                                         return (ARCHIVE_FAILED);
1098                                 }
1099                                 filters[fi].id = LZMA_FILTER_DELTA;
1100                                 memset(&delta_opt, 0, sizeof(delta_opt));
1101                                 delta_opt.type = LZMA_DELTA_TYPE_BYTE;
1102                                 delta_opt.dist =
1103                                     (uint32_t)coder2->properties[0] + 1;
1104                                 filters[fi].options = &delta_opt;
1105                                 fi++;
1106                                 break;
1107                         /* Following filters have not been tested yet. */
1108                         case _7Z_POWERPC:
1109                                 filters[fi].id = LZMA_FILTER_POWERPC;
1110                                 fi++;
1111                                 break;
1112                         case _7Z_IA64:
1113                                 filters[fi].id = LZMA_FILTER_IA64;
1114                                 fi++;
1115                                 break;
1116                         case _7Z_ARM:
1117                                 filters[fi].id = LZMA_FILTER_ARM;
1118                                 fi++;
1119                                 break;
1120                         case _7Z_ARMTHUMB:
1121                                 filters[fi].id = LZMA_FILTER_ARMTHUMB;
1122                                 fi++;
1123                                 break;
1124                         case _7Z_SPARC:
1125                                 filters[fi].id = LZMA_FILTER_SPARC;
1126                                 fi++;
1127                                 break;
1128                         default:
1129                                 archive_set_error(&a->archive,
1130                                     ARCHIVE_ERRNO_MISC,
1131                                     "Unexpected codec ID: %lX", zip->codec2);
1132                                 return (ARCHIVE_FAILED);
1133                         }
1134                 }
1135
1136                 if (zip->codec == _7Z_LZMA2)
1137                         filters[fi].id = LZMA_FILTER_LZMA2;
1138                 else
1139                         filters[fi].id = LZMA_FILTER_LZMA1;
1140                 filters[fi].options = NULL;
1141                 ff = &filters[fi];
1142                 r = lzma_properties_decode(&filters[fi], NULL,
1143                     coder1->properties, (size_t)coder1->propertiesSize);
1144                 if (r != LZMA_OK) {
1145                         set_error(a, r);
1146                         return (ARCHIVE_FAILED);
1147                 }
1148                 fi++;
1149
1150                 filters[fi].id = LZMA_VLI_UNKNOWN;
1151                 filters[fi].options = NULL;
1152                 r = lzma_raw_decoder(&(zip->lzstream), filters);
1153                 free(ff->options);
1154                 if (r != LZMA_OK) {
1155                         set_error(a, r);
1156                         return (ARCHIVE_FAILED);
1157                 }
1158                 zip->lzstream_valid = 1;
1159                 zip->lzstream.total_in = 0;
1160                 zip->lzstream.total_out = 0;
1161                 break;
1162         }
1163 #else
1164                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1165                     "LZMA codec is unsupported");
1166                 return (ARCHIVE_FAILED);
1167 #endif
1168         case _7Z_BZ2:
1169 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
1170                 if (zip->bzstream_valid) {
1171                         BZ2_bzDecompressEnd(&(zip->bzstream));
1172                         zip->bzstream_valid = 0;
1173                 }
1174                 r = BZ2_bzDecompressInit(&(zip->bzstream), 0, 0);
1175                 if (r == BZ_MEM_ERROR)
1176                         r = BZ2_bzDecompressInit(&(zip->bzstream), 0, 1);
1177                 if (r != BZ_OK) {
1178                         int err = ARCHIVE_ERRNO_MISC;
1179                         const char *detail = NULL;
1180                         switch (r) {
1181                         case BZ_PARAM_ERROR:
1182                                 detail = "invalid setup parameter";
1183                                 break;
1184                         case BZ_MEM_ERROR:
1185                                 err = ENOMEM;
1186                                 detail = "out of memory";
1187                                 break;
1188                         case BZ_CONFIG_ERROR:
1189                                 detail = "mis-compiled library";
1190                                 break;
1191                         }
1192                         archive_set_error(&a->archive, err,
1193                             "Internal error initializing decompressor: %s",
1194                             detail != NULL ? detail : "??");
1195                         zip->bzstream_valid = 0;
1196                         return (ARCHIVE_FAILED);
1197                 }
1198                 zip->bzstream_valid = 1;
1199                 zip->bzstream.total_in_lo32 = 0;
1200                 zip->bzstream.total_in_hi32 = 0;
1201                 zip->bzstream.total_out_lo32 = 0;
1202                 zip->bzstream.total_out_hi32 = 0;
1203                 break;
1204 #else
1205                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1206                     "BZ2 codec is unsupported");
1207                 return (ARCHIVE_FAILED);
1208 #endif
1209         case _7Z_DEFLATE:
1210 #ifdef HAVE_ZLIB_H
1211                 if (zip->stream_valid)
1212                         r = inflateReset(&(zip->stream));
1213                 else
1214                         r = inflateInit2(&(zip->stream),
1215                             -15 /* Don't check for zlib header */);
1216                 if (r != Z_OK) {
1217                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1218                             "Couldn't initialize zlib stream.");
1219                         return (ARCHIVE_FAILED);
1220                 }
1221                 zip->stream_valid = 1;
1222                 zip->stream.total_in = 0;
1223                 zip->stream.total_out = 0;
1224                 break;
1225 #else
1226                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1227                     "DEFLATE codec is unsupported");
1228                 return (ARCHIVE_FAILED);
1229 #endif
1230         case _7Z_PPMD:
1231         {
1232                 unsigned order;
1233                 uint32_t msize;
1234
1235                 if (zip->ppmd7_valid) {
1236                         __archive_ppmd7_functions.Ppmd7_Free(
1237                             &zip->ppmd7_context);
1238                         zip->ppmd7_valid = 0;
1239                 }
1240
1241                 if (coder1->propertiesSize < 5) {
1242                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1243                             "Malformed PPMd parameter");
1244                         return (ARCHIVE_FAILED);
1245                 }
1246                 order = coder1->properties[0];
1247                 msize = archive_le32dec(&(coder1->properties[1]));
1248                 if (order < PPMD7_MIN_ORDER || order > PPMD7_MAX_ORDER ||
1249                     msize < PPMD7_MIN_MEM_SIZE || msize > PPMD7_MAX_MEM_SIZE) {
1250                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1251                             "Malformed PPMd parameter");
1252                         return (ARCHIVE_FAILED);
1253                 }
1254                 __archive_ppmd7_functions.Ppmd7_Construct(&zip->ppmd7_context);
1255                 r = __archive_ppmd7_functions.Ppmd7_Alloc(
1256                         &zip->ppmd7_context, msize);
1257                 if (r == 0) {
1258                         archive_set_error(&a->archive, ENOMEM,
1259                             "Coludn't allocate memory for PPMd");
1260                         return (ARCHIVE_FATAL);
1261                 }
1262                 __archive_ppmd7_functions.Ppmd7_Init(
1263                         &zip->ppmd7_context, order);
1264                 __archive_ppmd7_functions.Ppmd7z_RangeDec_CreateVTable(
1265                         &zip->range_dec);
1266                 zip->ppmd7_valid = 1;
1267                 zip->ppmd7_stat = 0;
1268                 zip->ppstream.overconsumed = 0;
1269                 zip->ppstream.total_in = 0;
1270                 zip->ppstream.total_out = 0;
1271                 break;
1272         }
1273         case _7Z_X86:
1274         case _7Z_X86_BCJ2:
1275         case _7Z_POWERPC:
1276         case _7Z_IA64:
1277         case _7Z_ARM:
1278         case _7Z_ARMTHUMB:
1279         case _7Z_SPARC:
1280         case _7Z_DELTA:
1281                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1282                     "Unexpected codec ID: %lX", zip->codec);
1283                 return (ARCHIVE_FAILED);
1284         case _7Z_CRYPTO_MAIN_ZIP:
1285         case _7Z_CRYPTO_RAR_29:
1286         case _7Z_CRYPTO_AES_256_SHA_256:
1287                 if (a->entry) {
1288                         archive_entry_set_is_metadata_encrypted(a->entry, 1);
1289                         archive_entry_set_is_data_encrypted(a->entry, 1);
1290                         zip->has_encrypted_entries = 1;
1291                 }
1292                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1293                     "Crypto codec not supported yet (ID: 0x%lX)", zip->codec);
1294                 return (ARCHIVE_FAILED);
1295         default:
1296                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1297                     "Unknown codec ID: %lX", zip->codec);
1298                 return (ARCHIVE_FAILED);
1299         }
1300
1301         return (ARCHIVE_OK);
1302 }
1303
1304 static int
1305 decompress(struct archive_read *a, struct _7zip *zip,
1306     void *buff, size_t *outbytes, const void *b, size_t *used)
1307 {
1308         const uint8_t *t_next_in;
1309         uint8_t *t_next_out;
1310         size_t o_avail_in, o_avail_out;
1311         size_t t_avail_in, t_avail_out;
1312         uint8_t *bcj2_next_out;
1313         size_t bcj2_avail_out;
1314         int r, ret = ARCHIVE_OK;
1315
1316         t_avail_in = o_avail_in = *used;
1317         t_avail_out = o_avail_out = *outbytes;
1318         t_next_in = b;
1319         t_next_out = buff;
1320
1321         if (zip->codec != _7Z_LZMA2 && zip->codec2 == _7Z_X86) {
1322                 int i;
1323
1324                 /* Do not copy out the BCJ remaining bytes when the output
1325                  * buffer size is less than five bytes. */
1326                 if (o_avail_in != 0 && t_avail_out < 5 && zip->odd_bcj_size) {
1327                         *used = 0;
1328                         *outbytes = 0;
1329                         return (ret);
1330                 }
1331                 for (i = 0; zip->odd_bcj_size > 0 && t_avail_out; i++) {
1332                         *t_next_out++ = zip->odd_bcj[i];
1333                         t_avail_out--;
1334                         zip->odd_bcj_size--;
1335                 }
1336                 if (o_avail_in == 0 || t_avail_out == 0) {
1337                         *used = o_avail_in - t_avail_in;
1338                         *outbytes = o_avail_out - t_avail_out;
1339                         if (o_avail_in == 0)
1340                                 ret = ARCHIVE_EOF;
1341                         return (ret);
1342                 }
1343         }
1344
1345         bcj2_next_out = t_next_out;
1346         bcj2_avail_out = t_avail_out;
1347         if (zip->codec2 == _7Z_X86_BCJ2) {
1348                 /*
1349                  * Decord a remaining decompressed main stream for BCJ2.
1350                  */
1351                 if (zip->tmp_stream_bytes_remaining) {
1352                         ssize_t bytes;
1353                         size_t remaining = zip->tmp_stream_bytes_remaining;
1354                         bytes = Bcj2_Decode(zip, t_next_out, t_avail_out);
1355                         if (bytes < 0) {
1356                                 archive_set_error(&(a->archive),
1357                                     ARCHIVE_ERRNO_MISC,
1358                                     "BCJ2 conversion Failed");
1359                                 return (ARCHIVE_FAILED);
1360                         }
1361                         zip->main_stream_bytes_remaining -=
1362                             remaining - zip->tmp_stream_bytes_remaining;
1363                         t_avail_out -= bytes;
1364                         if (o_avail_in == 0 || t_avail_out == 0) {
1365                                 *used = 0;
1366                                 *outbytes = o_avail_out - t_avail_out;
1367                                 if (o_avail_in == 0 &&
1368                                     zip->tmp_stream_bytes_remaining)
1369                                         ret = ARCHIVE_EOF;
1370                                 return (ret);
1371                         }
1372                         t_next_out += bytes;
1373                         bcj2_next_out = t_next_out;
1374                         bcj2_avail_out = t_avail_out;
1375                 }
1376                 t_next_out = zip->tmp_stream_buff;
1377                 t_avail_out = zip->tmp_stream_buff_size;
1378         }
1379
1380         switch (zip->codec) {
1381         case _7Z_COPY:
1382         {
1383                 size_t bytes =
1384                     (t_avail_in > t_avail_out)?t_avail_out:t_avail_in;
1385
1386                 memcpy(t_next_out, t_next_in, bytes);
1387                 t_avail_in -= bytes;
1388                 t_avail_out -= bytes;
1389                 if (o_avail_in == 0)
1390                         ret = ARCHIVE_EOF;
1391                 break;
1392         }
1393 #ifdef HAVE_LZMA_H
1394         case _7Z_LZMA: case _7Z_LZMA2:
1395                 zip->lzstream.next_in = t_next_in;
1396                 zip->lzstream.avail_in = t_avail_in;
1397                 zip->lzstream.next_out = t_next_out;
1398                 zip->lzstream.avail_out = t_avail_out;
1399
1400                 r = lzma_code(&(zip->lzstream), LZMA_RUN);
1401                 switch (r) {
1402                 case LZMA_STREAM_END: /* Found end of stream. */
1403                         lzma_end(&(zip->lzstream));
1404                         zip->lzstream_valid = 0;
1405                         ret = ARCHIVE_EOF;
1406                         break;
1407                 case LZMA_OK: /* Decompressor made some progress. */
1408                         break;
1409                 default:
1410                         archive_set_error(&(a->archive),
1411                             ARCHIVE_ERRNO_MISC,
1412                                 "Decompression failed(%d)",
1413                             r);
1414                         return (ARCHIVE_FAILED);
1415                 }
1416                 t_avail_in = zip->lzstream.avail_in;
1417                 t_avail_out = zip->lzstream.avail_out;
1418                 break;
1419 #endif
1420 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
1421         case _7Z_BZ2:
1422                 zip->bzstream.next_in = (char *)(uintptr_t)t_next_in;
1423                 zip->bzstream.avail_in = t_avail_in;
1424                 zip->bzstream.next_out = (char *)(uintptr_t)t_next_out;
1425                 zip->bzstream.avail_out = t_avail_out;
1426                 r = BZ2_bzDecompress(&(zip->bzstream));
1427                 switch (r) {
1428                 case BZ_STREAM_END: /* Found end of stream. */
1429                         switch (BZ2_bzDecompressEnd(&(zip->bzstream))) {
1430                         case BZ_OK:
1431                                 break;
1432                         default:
1433                                 archive_set_error(&(a->archive),
1434                                     ARCHIVE_ERRNO_MISC,
1435                                     "Failed to clean up decompressor");
1436                                 return (ARCHIVE_FAILED);
1437                         }
1438                         zip->bzstream_valid = 0;
1439                         ret = ARCHIVE_EOF;
1440                         break;
1441                 case BZ_OK: /* Decompressor made some progress. */
1442                         break;
1443                 default:
1444                         archive_set_error(&(a->archive),
1445                             ARCHIVE_ERRNO_MISC,
1446                             "bzip decompression failed");
1447                         return (ARCHIVE_FAILED);
1448                 }
1449                 t_avail_in = zip->bzstream.avail_in;
1450                 t_avail_out = zip->bzstream.avail_out;
1451                 break;
1452 #endif
1453 #ifdef HAVE_ZLIB_H
1454         case _7Z_DEFLATE:
1455                 zip->stream.next_in = (Bytef *)(uintptr_t)t_next_in;
1456                 zip->stream.avail_in = (uInt)t_avail_in;
1457                 zip->stream.next_out = t_next_out;
1458                 zip->stream.avail_out = (uInt)t_avail_out;
1459                 r = inflate(&(zip->stream), 0);
1460                 switch (r) {
1461                 case Z_STREAM_END: /* Found end of stream. */
1462                         ret = ARCHIVE_EOF;
1463                         break;
1464                 case Z_OK: /* Decompressor made some progress.*/
1465                         break;
1466                 default:
1467                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1468                             "File decompression failed (%d)", r);
1469                         return (ARCHIVE_FAILED);
1470                 }
1471                 t_avail_in = zip->stream.avail_in;
1472                 t_avail_out = zip->stream.avail_out;
1473                 break;
1474 #endif
1475         case _7Z_PPMD:
1476         {
1477                 uint64_t flush_bytes;
1478
1479                 if (!zip->ppmd7_valid || zip->ppmd7_stat < 0 ||
1480                     t_avail_out <= 0) {
1481                         archive_set_error(&(a->archive),
1482                             ARCHIVE_ERRNO_MISC,
1483                             "Decompression internal error");
1484                         return (ARCHIVE_FAILED);
1485                 }
1486                 zip->ppstream.next_in = t_next_in;
1487                 zip->ppstream.avail_in = t_avail_in;
1488                 zip->ppstream.next_out = t_next_out;
1489                 zip->ppstream.avail_out = t_avail_out;
1490                 if (zip->ppmd7_stat == 0) {
1491                         zip->bytein.a = a;
1492                         zip->bytein.Read = &ppmd_read;
1493                         zip->range_dec.Stream = &zip->bytein;
1494                         r = __archive_ppmd7_functions.Ppmd7z_RangeDec_Init(
1495                                 &(zip->range_dec));
1496                         if (r == 0) {
1497                                 zip->ppmd7_stat = -1;
1498                                 archive_set_error(&a->archive,
1499                                     ARCHIVE_ERRNO_MISC,
1500                                     "Failed to initialize PPMd range decoder");
1501                                 return (ARCHIVE_FAILED);
1502                         }
1503                         if (zip->ppstream.overconsumed) {
1504                                 zip->ppmd7_stat = -1;
1505                                 return (ARCHIVE_FAILED);
1506                         }
1507                         zip->ppmd7_stat = 1;
1508                 }
1509
1510                 if (t_avail_in == 0)
1511                         /* XXX Flush out remaining decoded data XXX */
1512                         flush_bytes = zip->folder_outbytes_remaining;
1513                 else
1514                         flush_bytes = 0;
1515
1516                 do {
1517                         int sym;
1518
1519                         sym = __archive_ppmd7_functions.Ppmd7_DecodeSymbol(
1520                                 &(zip->ppmd7_context), &(zip->range_dec.p));
1521                         if (sym < 0) {
1522                                 zip->ppmd7_stat = -1;
1523                                 archive_set_error(&a->archive,
1524                                     ARCHIVE_ERRNO_FILE_FORMAT,
1525                                     "Failed to decode PPMd");
1526                                 return (ARCHIVE_FAILED);
1527                         }
1528                         if (zip->ppstream.overconsumed) {
1529                                 zip->ppmd7_stat = -1;
1530                                 return (ARCHIVE_FAILED);
1531                         }
1532                         *zip->ppstream.next_out++ = (unsigned char)sym;
1533                         zip->ppstream.avail_out--;
1534                         zip->ppstream.total_out++;
1535                         if (flush_bytes)
1536                                 flush_bytes--;
1537                 } while (zip->ppstream.avail_out &&
1538                         (zip->ppstream.avail_in || flush_bytes));
1539
1540                 t_avail_in = (size_t)zip->ppstream.avail_in;
1541                 t_avail_out = (size_t)zip->ppstream.avail_out;
1542                 break;
1543         }
1544         default:
1545                 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC,
1546                     "Decompression internal error");
1547                 return (ARCHIVE_FAILED);
1548         }
1549         if (ret != ARCHIVE_OK && ret != ARCHIVE_EOF)
1550                 return (ret);
1551
1552         *used = o_avail_in - t_avail_in;
1553         *outbytes = o_avail_out - t_avail_out;
1554
1555         /*
1556          * Decord BCJ.
1557          */
1558         if (zip->codec != _7Z_LZMA2 && zip->codec2 == _7Z_X86) {
1559                 size_t l = x86_Convert(zip, buff, *outbytes);
1560                 zip->odd_bcj_size = *outbytes - l;
1561                 if (zip->odd_bcj_size > 0 && zip->odd_bcj_size <= 4 &&
1562                     o_avail_in && ret != ARCHIVE_EOF) {
1563                         memcpy(zip->odd_bcj, ((unsigned char *)buff) + l,
1564                             zip->odd_bcj_size);
1565                         *outbytes = l;
1566                 } else
1567                         zip->odd_bcj_size = 0;
1568         }
1569
1570         /*
1571          * Decord BCJ2 with a decompressed main stream.
1572          */
1573         if (zip->codec2 == _7Z_X86_BCJ2) {
1574                 ssize_t bytes;
1575
1576                 zip->tmp_stream_bytes_avail =
1577                     zip->tmp_stream_buff_size - t_avail_out;
1578                 if (zip->tmp_stream_bytes_avail >
1579                       zip->main_stream_bytes_remaining)
1580                         zip->tmp_stream_bytes_avail =
1581                             zip->main_stream_bytes_remaining;
1582                 zip->tmp_stream_bytes_remaining = zip->tmp_stream_bytes_avail;
1583                 bytes = Bcj2_Decode(zip, bcj2_next_out, bcj2_avail_out);
1584                 if (bytes < 0) {
1585                         archive_set_error(&(a->archive),
1586                             ARCHIVE_ERRNO_MISC, "BCJ2 conversion Failed");
1587                         return (ARCHIVE_FAILED);
1588                 }
1589                 zip->main_stream_bytes_remaining -=
1590                     zip->tmp_stream_bytes_avail
1591                       - zip->tmp_stream_bytes_remaining;
1592                 bcj2_avail_out -= bytes;
1593                 *outbytes = o_avail_out - bcj2_avail_out;
1594         }
1595
1596         return (ret);
1597 }
1598
1599 static int
1600 free_decompression(struct archive_read *a, struct _7zip *zip)
1601 {
1602         int r = ARCHIVE_OK;
1603
1604 #if !defined(HAVE_ZLIB_H) &&\
1605         !(defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR))
1606         (void)a;/* UNUSED */
1607 #endif
1608 #ifdef HAVE_LZMA_H
1609         if (zip->lzstream_valid)
1610                 lzma_end(&(zip->lzstream));
1611 #endif
1612 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
1613         if (zip->bzstream_valid) {
1614                 if (BZ2_bzDecompressEnd(&(zip->bzstream)) != BZ_OK) {
1615                         archive_set_error(&a->archive,
1616                             ARCHIVE_ERRNO_MISC,
1617                             "Failed to clean up bzip2 decompressor");
1618                         r = ARCHIVE_FATAL;
1619                 }
1620                 zip->bzstream_valid = 0;
1621         }
1622 #endif
1623 #ifdef HAVE_ZLIB_H
1624         if (zip->stream_valid) {
1625                 if (inflateEnd(&(zip->stream)) != Z_OK) {
1626                         archive_set_error(&a->archive,
1627                             ARCHIVE_ERRNO_MISC,
1628                             "Failed to clean up zlib decompressor");
1629                         r = ARCHIVE_FATAL;
1630                 }
1631                 zip->stream_valid = 0;
1632         }
1633 #endif
1634         if (zip->ppmd7_valid) {
1635                 __archive_ppmd7_functions.Ppmd7_Free(
1636                         &zip->ppmd7_context);
1637                 zip->ppmd7_valid = 0;
1638         }
1639         return (r);
1640 }
1641
1642 static int
1643 parse_7zip_uint64(struct archive_read *a, uint64_t *val)
1644 {
1645         const unsigned char *p;
1646         unsigned char avail, mask;
1647         int i;
1648
1649         if ((p = header_bytes(a, 1)) == NULL)
1650                 return (-1);
1651         avail = *p;
1652         mask = 0x80;
1653         *val = 0;
1654         for (i = 0; i < 8; i++) {
1655                 if (avail & mask) {
1656                         if ((p = header_bytes(a, 1)) == NULL)
1657                                 return (-1);
1658                         *val |= ((uint64_t)*p) << (8 * i);
1659                         mask >>= 1;
1660                         continue;
1661                 }
1662                 *val += ((uint64_t)(avail & (mask -1))) << (8 * i);
1663                 break;
1664         }
1665         return (0);
1666 }
1667
1668 static int
1669 read_Bools(struct archive_read *a, unsigned char *data, size_t num)
1670 {
1671         const unsigned char *p;
1672         unsigned i, mask = 0, avail = 0;
1673
1674         for (i = 0; i < num; i++) {
1675                 if (mask == 0) {
1676                         if ((p = header_bytes(a, 1)) == NULL)
1677                                 return (-1);
1678                         avail = *p;
1679                         mask = 0x80;
1680                 }
1681                 data[i] = (avail & mask)?1:0;
1682                 mask >>= 1;
1683         }
1684         return (0);
1685 }
1686
1687 static void
1688 free_Digest(struct _7z_digests *d)
1689 {
1690         free(d->defineds);
1691         free(d->digests);
1692 }
1693
1694 static int
1695 read_Digests(struct archive_read *a, struct _7z_digests *d, size_t num)
1696 {
1697         const unsigned char *p;
1698         unsigned i;
1699
1700         if (num == 0)
1701                 return (-1);
1702         memset(d, 0, sizeof(*d));
1703
1704         d->defineds = malloc(num);
1705         if (d->defineds == NULL)
1706                 return (-1);
1707         /*
1708          * Read Bools.
1709          */
1710         if ((p = header_bytes(a, 1)) == NULL)
1711                 return (-1);
1712         if (*p == 0) {
1713                 if (read_Bools(a, d->defineds, num) < 0)
1714                         return (-1);
1715         } else
1716                 /* All are defined */
1717                 memset(d->defineds, 1, num);
1718
1719         d->digests = calloc(num, sizeof(*d->digests));
1720         if (d->digests == NULL)
1721                 return (-1);
1722         for (i = 0; i < num; i++) {
1723                 if (d->defineds[i]) {
1724                         if ((p = header_bytes(a, 4)) == NULL)
1725                                 return (-1);
1726                         d->digests[i] = archive_le32dec(p);
1727                 }
1728         }
1729
1730         return (0);
1731 }
1732
1733 static void
1734 free_PackInfo(struct _7z_pack_info *pi)
1735 {
1736         free(pi->sizes);
1737         free(pi->positions);
1738         free_Digest(&(pi->digest));
1739 }
1740
1741 static int
1742 read_PackInfo(struct archive_read *a, struct _7z_pack_info *pi)
1743 {
1744         const unsigned char *p;
1745         unsigned i;
1746
1747         memset(pi, 0, sizeof(*pi));
1748
1749         /*
1750          * Read PackPos.
1751          */
1752         if (parse_7zip_uint64(a, &(pi->pos)) < 0)
1753                 return (-1);
1754
1755         /*
1756          * Read NumPackStreams.
1757          */
1758         if (parse_7zip_uint64(a, &(pi->numPackStreams)) < 0)
1759                 return (-1);
1760         if (pi->numPackStreams == 0)
1761                 return (-1);
1762         if (UMAX_ENTRY < pi->numPackStreams)
1763                 return (-1);
1764
1765         /*
1766          * Read PackSizes[num]
1767          */
1768         if ((p = header_bytes(a, 1)) == NULL)
1769                 return (-1);
1770         if (*p == kEnd)
1771                 /* PackSizes[num] are not present. */
1772                 return (0);
1773         if (*p != kSize)
1774                 return (-1);
1775         pi->sizes = calloc((size_t)pi->numPackStreams, sizeof(uint64_t));
1776         pi->positions = calloc((size_t)pi->numPackStreams, sizeof(uint64_t));
1777         if (pi->sizes == NULL || pi->positions == NULL)
1778                 return (-1);
1779
1780         for (i = 0; i < pi->numPackStreams; i++) {
1781                 if (parse_7zip_uint64(a, &(pi->sizes[i])) < 0)
1782                         return (-1);
1783         }
1784
1785         /*
1786          * Read PackStreamDigests[num]
1787          */
1788         if ((p = header_bytes(a, 1)) == NULL)
1789                 return (-1);
1790         if (*p == kEnd) {
1791                 /* PackStreamDigests[num] are not present. */
1792                 pi->digest.defineds =
1793                     calloc((size_t)pi->numPackStreams, sizeof(*pi->digest.defineds));
1794                 pi->digest.digests =
1795                     calloc((size_t)pi->numPackStreams, sizeof(*pi->digest.digests));
1796                 if (pi->digest.defineds == NULL || pi->digest.digests == NULL)
1797                         return (-1);
1798                 return (0);
1799         }
1800
1801         if (*p != kCRC)
1802                 return (-1);
1803
1804         if (read_Digests(a, &(pi->digest), (size_t)pi->numPackStreams) < 0)
1805                 return (-1);
1806
1807         /*
1808          *  Must be marked by kEnd.
1809          */
1810         if ((p = header_bytes(a, 1)) == NULL)
1811                 return (-1);
1812         if (*p != kEnd)
1813                 return (-1);
1814         return (0);
1815 }
1816
1817 static void
1818 free_Folder(struct _7z_folder *f)
1819 {
1820         unsigned i;
1821
1822         if (f->coders) {
1823                 for (i = 0; i< f->numCoders; i++) {
1824                         free(f->coders[i].properties);
1825                 }
1826                 free(f->coders);
1827         }
1828         free(f->bindPairs);
1829         free(f->packedStreams);
1830         free(f->unPackSize);
1831 }
1832
1833 static int
1834 read_Folder(struct archive_read *a, struct _7z_folder *f)
1835 {
1836         struct _7zip *zip = (struct _7zip *)a->format->data;
1837         const unsigned char *p;
1838         uint64_t numInStreamsTotal = 0;
1839         uint64_t numOutStreamsTotal = 0;
1840         unsigned i;
1841
1842         memset(f, 0, sizeof(*f));
1843
1844         /*
1845          * Read NumCoders.
1846          */
1847         if (parse_7zip_uint64(a, &(f->numCoders)) < 0)
1848                 return (-1);
1849         if (f->numCoders > 4)
1850                 /* Too many coders. */
1851                 return (-1);
1852
1853         f->coders = calloc((size_t)f->numCoders, sizeof(*f->coders));
1854         if (f->coders == NULL)
1855                 return (-1);
1856         for (i = 0; i< f->numCoders; i++) {
1857                 size_t codec_size;
1858                 int simple, attr;
1859
1860                 if ((p = header_bytes(a, 1)) == NULL)
1861                         return (-1);
1862                 /*
1863                  * 0:3 CodecIdSize
1864                  * 4:  0 - IsSimple
1865                  *     1 - Is not Simple
1866                  * 5:  0 - No Attributes
1867                  *     1 - There are Attributes;
1868                  * 7:  Must be zero.
1869                  */
1870                 codec_size = *p & 0xf;
1871                 simple = (*p & 0x10)?0:1;
1872                 attr = *p & 0x20;
1873                 if (*p & 0x80)
1874                         return (-1);/* Not supported. */
1875
1876                 /*
1877                  * Read Decompression Method IDs.
1878                  */
1879                 if ((p = header_bytes(a, codec_size)) == NULL)
1880                         return (-1);
1881
1882                 f->coders[i].codec = decode_codec_id(p, codec_size);
1883
1884                 if (simple) {
1885                         f->coders[i].numInStreams = 1;
1886                         f->coders[i].numOutStreams = 1;
1887                 } else {
1888                         if (parse_7zip_uint64(
1889                             a, &(f->coders[i].numInStreams)) < 0)
1890                                 return (-1);
1891                         if (UMAX_ENTRY < f->coders[i].numInStreams)
1892                                 return (-1);
1893                         if (parse_7zip_uint64(
1894                             a, &(f->coders[i].numOutStreams)) < 0)
1895                                 return (-1);
1896                         if (UMAX_ENTRY < f->coders[i].numOutStreams)
1897                                 return (-1);
1898                 }
1899
1900                 if (attr) {
1901                         if (parse_7zip_uint64(
1902                             a, &(f->coders[i].propertiesSize)) < 0)
1903                                 return (-1);
1904                         if ((p = header_bytes(
1905                             a, (size_t)f->coders[i].propertiesSize)) == NULL)
1906                                 return (-1);
1907                         f->coders[i].properties =
1908                             malloc((size_t)f->coders[i].propertiesSize);
1909                         if (f->coders[i].properties == NULL)
1910                                 return (-1);
1911                         memcpy(f->coders[i].properties, p,
1912                             (size_t)f->coders[i].propertiesSize);
1913                 }
1914
1915                 numInStreamsTotal += f->coders[i].numInStreams;
1916                 numOutStreamsTotal += f->coders[i].numOutStreams;
1917         }
1918
1919         if (numOutStreamsTotal == 0 ||
1920             numInStreamsTotal < numOutStreamsTotal-1)
1921                 return (-1);
1922
1923         f->numBindPairs = numOutStreamsTotal - 1;
1924         if (zip->header_bytes_remaining < f->numBindPairs)
1925                         return (-1);
1926         if (f->numBindPairs > 0) {
1927                 f->bindPairs =
1928                         calloc((size_t)f->numBindPairs, sizeof(*f->bindPairs));
1929                 if (f->bindPairs == NULL)
1930                         return (-1);
1931         } else
1932                 f->bindPairs = NULL;
1933         for (i = 0; i < f->numBindPairs; i++) {
1934                 if (parse_7zip_uint64(a, &(f->bindPairs[i].inIndex)) < 0)
1935                         return (-1);
1936                 if (UMAX_ENTRY < f->bindPairs[i].inIndex)
1937                         return (-1);
1938                 if (parse_7zip_uint64(a, &(f->bindPairs[i].outIndex)) < 0)
1939                         return (-1);
1940                 if (UMAX_ENTRY < f->bindPairs[i].outIndex)
1941                         return (-1);
1942         }
1943
1944         f->numPackedStreams = numInStreamsTotal - f->numBindPairs;
1945         f->packedStreams =
1946             calloc((size_t)f->numPackedStreams, sizeof(*f->packedStreams));
1947         if (f->packedStreams == NULL)
1948                 return (-1);
1949         if (f->numPackedStreams == 1) {
1950                 for (i = 0; i < numInStreamsTotal; i++) {
1951                         unsigned j;
1952                         for (j = 0; j < f->numBindPairs; j++) {
1953                                 if (f->bindPairs[j].inIndex == i)
1954                                         break;
1955                         }
1956                         if (j == f->numBindPairs)
1957                                 break;
1958                 }
1959                 if (i == numInStreamsTotal)
1960                         return (-1);
1961                 f->packedStreams[0] = i;
1962         } else {
1963                 for (i = 0; i < f->numPackedStreams; i++) {
1964                         if (parse_7zip_uint64(a, &(f->packedStreams[i])) < 0)
1965                                 return (-1);
1966                         if (UMAX_ENTRY < f->packedStreams[i])
1967                                 return (-1);
1968                 }
1969         }
1970         f->numInStreams = numInStreamsTotal;
1971         f->numOutStreams = numOutStreamsTotal;
1972
1973         return (0);
1974 }
1975
1976 static void
1977 free_CodersInfo(struct _7z_coders_info *ci)
1978 {
1979         unsigned i;
1980
1981         if (ci->folders) {
1982                 for (i = 0; i < ci->numFolders; i++)
1983                         free_Folder(&(ci->folders[i]));
1984                 free(ci->folders);
1985         }
1986 }
1987
1988 static int
1989 read_CodersInfo(struct archive_read *a, struct _7z_coders_info *ci)
1990 {
1991         const unsigned char *p;
1992         struct _7z_digests digest;
1993         unsigned i;
1994
1995         memset(ci, 0, sizeof(*ci));
1996         memset(&digest, 0, sizeof(digest));
1997
1998         if ((p = header_bytes(a, 1)) == NULL)
1999                 goto failed;
2000         if (*p != kFolder)
2001                 goto failed;
2002
2003         /*
2004          * Read NumFolders.
2005          */
2006         if (parse_7zip_uint64(a, &(ci->numFolders)) < 0)
2007                 goto failed;
2008         if (UMAX_ENTRY < ci->numFolders)
2009                 return (-1);
2010
2011         /*
2012          * Read External.
2013          */
2014         if ((p = header_bytes(a, 1)) == NULL)
2015                 goto failed;
2016         switch (*p) {
2017         case 0:
2018                 ci->folders =
2019                         calloc((size_t)ci->numFolders, sizeof(*ci->folders));
2020                 if (ci->folders == NULL)
2021                         return (-1);
2022                 for (i = 0; i < ci->numFolders; i++) {
2023                         if (read_Folder(a, &(ci->folders[i])) < 0)
2024                                 goto failed;
2025                 }
2026                 break;
2027         case 1:
2028                 if (parse_7zip_uint64(a, &(ci->dataStreamIndex)) < 0)
2029                         return (-1);
2030                 if (UMAX_ENTRY < ci->dataStreamIndex)
2031                         return (-1);
2032                 if (ci->numFolders > 0) {
2033                         archive_set_error(&a->archive, -1,
2034                             "Malformed 7-Zip archive");
2035                         goto failed;
2036                 }
2037                 break;
2038         default:
2039                 archive_set_error(&a->archive, -1,
2040                     "Malformed 7-Zip archive");
2041                 goto failed;
2042         }
2043
2044         if ((p = header_bytes(a, 1)) == NULL)
2045                 goto failed;
2046         if (*p != kCodersUnPackSize)
2047                 goto failed;
2048
2049         for (i = 0; i < ci->numFolders; i++) {
2050                 struct _7z_folder *folder = &(ci->folders[i]);
2051                 unsigned j;
2052
2053                 folder->unPackSize =
2054                     calloc((size_t)folder->numOutStreams, sizeof(*folder->unPackSize));
2055                 if (folder->unPackSize == NULL)
2056                         goto failed;
2057                 for (j = 0; j < folder->numOutStreams; j++) {
2058                         if (parse_7zip_uint64(a, &(folder->unPackSize[j])) < 0)
2059                                 goto failed;
2060                 }
2061         }
2062
2063         /*
2064          * Read CRCs.
2065          */
2066         if ((p = header_bytes(a, 1)) == NULL)
2067                 goto failed;
2068         if (*p == kEnd)
2069                 return (0);
2070         if (*p != kCRC)
2071                 goto failed;
2072         if (read_Digests(a, &digest, (size_t)ci->numFolders) < 0)
2073                 goto failed;
2074         for (i = 0; i < ci->numFolders; i++) {
2075                 ci->folders[i].digest_defined = digest.defineds[i];
2076                 ci->folders[i].digest = digest.digests[i];
2077         }
2078
2079         /*
2080          *  Must be kEnd.
2081          */
2082         if ((p = header_bytes(a, 1)) == NULL)
2083                 goto failed;
2084         if (*p != kEnd)
2085                 goto failed;
2086         free_Digest(&digest);
2087         return (0);
2088 failed:
2089         free_Digest(&digest);
2090         return (-1);
2091 }
2092
2093 static uint64_t
2094 folder_uncompressed_size(struct _7z_folder *f)
2095 {
2096         int n = (int)f->numOutStreams;
2097         unsigned pairs = (unsigned)f->numBindPairs;
2098
2099         while (--n >= 0) {
2100                 unsigned i;
2101                 for (i = 0; i < pairs; i++) {
2102                         if (f->bindPairs[i].outIndex == (uint64_t)n)
2103                                 break;
2104                 }
2105                 if (i >= pairs)
2106                         return (f->unPackSize[n]);
2107         }
2108         return (0);
2109 }
2110
2111 static void
2112 free_SubStreamsInfo(struct _7z_substream_info *ss)
2113 {
2114         free(ss->unpackSizes);
2115         free(ss->digestsDefined);
2116         free(ss->digests);
2117 }
2118
2119 static int
2120 read_SubStreamsInfo(struct archive_read *a, struct _7z_substream_info *ss,
2121     struct _7z_folder *f, size_t numFolders)
2122 {
2123         const unsigned char *p;
2124         uint64_t *usizes;
2125         size_t unpack_streams;
2126         int type;
2127         unsigned i;
2128         uint32_t numDigests;
2129
2130         memset(ss, 0, sizeof(*ss));
2131
2132         for (i = 0; i < numFolders; i++)
2133                 f[i].numUnpackStreams = 1;
2134
2135         if ((p = header_bytes(a, 1)) == NULL)
2136                 return (-1);
2137         type = *p;
2138
2139         if (type == kNumUnPackStream) {
2140                 unpack_streams = 0;
2141                 for (i = 0; i < numFolders; i++) {
2142                         if (parse_7zip_uint64(a, &(f[i].numUnpackStreams)) < 0)
2143                                 return (-1);
2144                         if (UMAX_ENTRY < f[i].numUnpackStreams)
2145                                 return (-1);
2146                         if (unpack_streams > SIZE_MAX - UMAX_ENTRY) {
2147                                 return (-1);
2148                         }
2149                         unpack_streams += (size_t)f[i].numUnpackStreams;
2150                 }
2151                 if ((p = header_bytes(a, 1)) == NULL)
2152                         return (-1);
2153                 type = *p;
2154         } else
2155                 unpack_streams = numFolders;
2156
2157         ss->unpack_streams = unpack_streams;
2158         if (unpack_streams) {
2159                 ss->unpackSizes = calloc(unpack_streams,
2160                     sizeof(*ss->unpackSizes));
2161                 ss->digestsDefined = calloc(unpack_streams,
2162                     sizeof(*ss->digestsDefined));
2163                 ss->digests = calloc(unpack_streams,
2164                     sizeof(*ss->digests));
2165                 if (ss->unpackSizes == NULL || ss->digestsDefined == NULL ||
2166                     ss->digests == NULL)
2167                         return (-1);
2168         }
2169
2170         usizes = ss->unpackSizes;
2171         for (i = 0; i < numFolders; i++) {
2172                 unsigned pack;
2173                 uint64_t sum;
2174
2175                 if (f[i].numUnpackStreams == 0)
2176                         continue;
2177
2178                 sum = 0;
2179                 if (type == kSize) {
2180                         for (pack = 1; pack < f[i].numUnpackStreams; pack++) {
2181                                 if (parse_7zip_uint64(a, usizes) < 0)
2182                                         return (-1);
2183                                 sum += *usizes++;
2184                         }
2185                 }
2186                 *usizes++ = folder_uncompressed_size(&f[i]) - sum;
2187         }
2188
2189         if (type == kSize) {
2190                 if ((p = header_bytes(a, 1)) == NULL)
2191                         return (-1);
2192                 type = *p;
2193         }
2194
2195         for (i = 0; i < unpack_streams; i++) {
2196                 ss->digestsDefined[i] = 0;
2197                 ss->digests[i] = 0;
2198         }
2199
2200         numDigests = 0;
2201         for (i = 0; i < numFolders; i++) {
2202                 if (f[i].numUnpackStreams != 1 || !f[i].digest_defined)
2203                         numDigests += (uint32_t)f[i].numUnpackStreams;
2204         }
2205
2206         if (type == kCRC) {
2207                 struct _7z_digests tmpDigests;
2208                 unsigned char *digestsDefined = ss->digestsDefined;
2209                 uint32_t * digests = ss->digests;
2210                 int di = 0;
2211
2212                 memset(&tmpDigests, 0, sizeof(tmpDigests));
2213                 if (read_Digests(a, &(tmpDigests), numDigests) < 0) {
2214                         free_Digest(&tmpDigests);
2215                         return (-1);
2216                 }
2217                 for (i = 0; i < numFolders; i++) {
2218                         if (f[i].numUnpackStreams == 1 && f[i].digest_defined) {
2219                                 *digestsDefined++ = 1;
2220                                 *digests++ = f[i].digest;
2221                         } else {
2222                                 unsigned j;
2223
2224                                 for (j = 0; j < f[i].numUnpackStreams;
2225                                     j++, di++) {
2226                                         *digestsDefined++ =
2227                                             tmpDigests.defineds[di];
2228                                         *digests++ =
2229                                             tmpDigests.digests[di];
2230                                 }
2231                         }
2232                 }
2233                 free_Digest(&tmpDigests);
2234                 if ((p = header_bytes(a, 1)) == NULL)
2235                         return (-1);
2236                 type = *p;
2237         }
2238
2239         /*
2240          *  Must be kEnd.
2241          */
2242         if (type != kEnd)
2243                 return (-1);
2244         return (0);
2245 }
2246
2247 static void
2248 free_StreamsInfo(struct _7z_stream_info *si)
2249 {
2250         free_PackInfo(&(si->pi));
2251         free_CodersInfo(&(si->ci));
2252         free_SubStreamsInfo(&(si->ss));
2253 }
2254
2255 static int
2256 read_StreamsInfo(struct archive_read *a, struct _7z_stream_info *si)
2257 {
2258         struct _7zip *zip = (struct _7zip *)a->format->data;
2259         const unsigned char *p;
2260         unsigned i;
2261
2262         memset(si, 0, sizeof(*si));
2263
2264         if ((p = header_bytes(a, 1)) == NULL)
2265                 return (-1);
2266         if (*p == kPackInfo) {
2267                 uint64_t packPos;
2268
2269                 if (read_PackInfo(a, &(si->pi)) < 0)
2270                         return (-1);
2271
2272                 if (si->pi.positions == NULL || si->pi.sizes == NULL)
2273                         return (-1);
2274                 /*
2275                  * Calculate packed stream positions.
2276                  */
2277                 packPos = si->pi.pos;
2278                 for (i = 0; i < si->pi.numPackStreams; i++) {
2279                         si->pi.positions[i] = packPos;
2280                         packPos += si->pi.sizes[i];
2281                         if (packPos > zip->header_offset)
2282                                 return (-1);
2283                 }
2284                 if ((p = header_bytes(a, 1)) == NULL)
2285                         return (-1);
2286         }
2287         if (*p == kUnPackInfo) {
2288                 uint32_t packIndex;
2289                 struct _7z_folder *f;
2290
2291                 if (read_CodersInfo(a, &(si->ci)) < 0)
2292                         return (-1);
2293
2294                 /*
2295                  * Calculate packed stream indexes.
2296                  */
2297                 packIndex = 0;
2298                 f = si->ci.folders;
2299                 for (i = 0; i < si->ci.numFolders; i++) {
2300                         f[i].packIndex = packIndex;
2301                         packIndex += (uint32_t)f[i].numPackedStreams;
2302                         if (packIndex > si->pi.numPackStreams)
2303                                 return (-1);
2304                 }
2305                 if ((p = header_bytes(a, 1)) == NULL)
2306                         return (-1);
2307         }
2308
2309         if (*p == kSubStreamsInfo) {
2310                 if (read_SubStreamsInfo(a, &(si->ss),
2311                     si->ci.folders, (size_t)si->ci.numFolders) < 0)
2312                         return (-1);
2313                 if ((p = header_bytes(a, 1)) == NULL)
2314                         return (-1);
2315         }
2316
2317         /*
2318          *  Must be kEnd.
2319          */
2320         if (*p != kEnd)
2321                 return (-1);
2322         return (0);
2323 }
2324
2325 static void
2326 free_Header(struct _7z_header_info *h)
2327 {
2328         free(h->emptyStreamBools);
2329         free(h->emptyFileBools);
2330         free(h->antiBools);
2331         free(h->attrBools);
2332 }
2333
2334 static int
2335 read_Header(struct archive_read *a, struct _7z_header_info *h,
2336     int check_header_id)
2337 {
2338         struct _7zip *zip = (struct _7zip *)a->format->data;
2339         const unsigned char *p;
2340         struct _7z_folder *folders;
2341         struct _7z_stream_info *si = &(zip->si);
2342         struct _7zip_entry *entries;
2343         uint32_t folderIndex, indexInFolder;
2344         unsigned i;
2345         int eindex, empty_streams, sindex;
2346
2347         if (check_header_id) {
2348                 /*
2349                  * Read Header.
2350                  */
2351                 if ((p = header_bytes(a, 1)) == NULL)
2352                         return (-1);
2353                 if (*p != kHeader)
2354                         return (-1);
2355         }
2356
2357         /*
2358          * Read ArchiveProperties.
2359          */
2360         if ((p = header_bytes(a, 1)) == NULL)
2361                 return (-1);
2362         if (*p == kArchiveProperties) {
2363                 for (;;) {
2364                         uint64_t size;
2365                         if ((p = header_bytes(a, 1)) == NULL)
2366                                 return (-1);
2367                         if (*p == 0)
2368                                 break;
2369                         if (parse_7zip_uint64(a, &size) < 0)
2370                                 return (-1);
2371                 }
2372                 if ((p = header_bytes(a, 1)) == NULL)
2373                         return (-1);
2374         }
2375
2376         /*
2377          * Read MainStreamsInfo.
2378          */
2379         if (*p == kMainStreamsInfo) {
2380                 if (read_StreamsInfo(a, &(zip->si)) < 0)
2381                         return (-1);
2382                 if ((p = header_bytes(a, 1)) == NULL)
2383                         return (-1);
2384         }
2385         if (*p == kEnd)
2386                 return (0);
2387
2388         /*
2389          * Read FilesInfo.
2390          */
2391         if (*p != kFilesInfo)
2392                 return (-1);
2393
2394         if (parse_7zip_uint64(a, &(zip->numFiles)) < 0)
2395                 return (-1);
2396         if (UMAX_ENTRY < zip->numFiles)
2397                 return (-1);
2398
2399         zip->entries = calloc((size_t)zip->numFiles, sizeof(*zip->entries));
2400         if (zip->entries == NULL)
2401                 return (-1);
2402         entries = zip->entries;
2403
2404         empty_streams = 0;
2405         for (;;) {
2406                 int type;
2407                 uint64_t size;
2408                 size_t ll;
2409
2410                 if ((p = header_bytes(a, 1)) == NULL)
2411                         return (-1);
2412                 type = *p;
2413                 if (type == kEnd)
2414                         break;
2415
2416                 if (parse_7zip_uint64(a, &size) < 0)
2417                         return (-1);
2418                 if (zip->header_bytes_remaining < size)
2419                         return (-1);
2420                 ll = (size_t)size;
2421
2422                 switch (type) {
2423                 case kEmptyStream:
2424                         if (h->emptyStreamBools != NULL)
2425                                 return (-1);
2426                         h->emptyStreamBools = calloc((size_t)zip->numFiles,
2427                             sizeof(*h->emptyStreamBools));
2428                         if (h->emptyStreamBools == NULL)
2429                                 return (-1);
2430                         if (read_Bools(
2431                             a, h->emptyStreamBools, (size_t)zip->numFiles) < 0)
2432                                 return (-1);
2433                         empty_streams = 0;
2434                         for (i = 0; i < zip->numFiles; i++) {
2435                                 if (h->emptyStreamBools[i])
2436                                         empty_streams++;
2437                         }
2438                         break;
2439                 case kEmptyFile:
2440                         if (empty_streams <= 0) {
2441                                 /* Unexcepted sequence. Skip this. */
2442                                 if (header_bytes(a, ll) == NULL)
2443                                         return (-1);
2444                                 break;
2445                         }
2446                         if (h->emptyFileBools != NULL)
2447                                 return (-1);
2448                         h->emptyFileBools = calloc(empty_streams,
2449                             sizeof(*h->emptyFileBools));
2450                         if (h->emptyFileBools == NULL)
2451                                 return (-1);
2452                         if (read_Bools(a, h->emptyFileBools, empty_streams) < 0)
2453                                 return (-1);
2454                         break;
2455                 case kAnti:
2456                         if (empty_streams <= 0) {
2457                                 /* Unexcepted sequence. Skip this. */
2458                                 if (header_bytes(a, ll) == NULL)
2459                                         return (-1);
2460                                 break;
2461                         }
2462                         if (h->antiBools != NULL)
2463                                 return (-1);
2464                         h->antiBools = calloc(empty_streams,
2465                             sizeof(*h->antiBools));
2466                         if (h->antiBools == NULL)
2467                                 return (-1);
2468                         if (read_Bools(a, h->antiBools, empty_streams) < 0)
2469                                 return (-1);
2470                         break;
2471                 case kCTime:
2472                 case kATime:
2473                 case kMTime:
2474                         if (read_Times(a, h, type) < 0)
2475                                 return (-1);
2476                         break;
2477                 case kName:
2478                 {
2479                         unsigned char *np;
2480                         size_t nl, nb;
2481
2482                         /* Skip one byte. */
2483                         if ((p = header_bytes(a, 1)) == NULL)
2484                                 return (-1);
2485                         ll--;
2486
2487                         if ((ll & 1) || ll < zip->numFiles * 4)
2488                                 return (-1);
2489
2490                         if (zip->entry_names != NULL)
2491                                 return (-1);
2492                         zip->entry_names = malloc(ll);
2493                         if (zip->entry_names == NULL)
2494                                 return (-1);
2495                         np = zip->entry_names;
2496                         nb = ll;
2497                         /*
2498                          * Copy whole file names.
2499                          * NOTE: This loop prevents from expanding
2500                          * the uncompressed buffer in order not to
2501                          * use extra memory resource.
2502                          */
2503                         while (nb) {
2504                                 size_t b;
2505                                 if (nb > UBUFF_SIZE)
2506                                         b = UBUFF_SIZE;
2507                                 else
2508                                         b = nb;
2509                                 if ((p = header_bytes(a, b)) == NULL)
2510                                         return (-1);
2511                                 memcpy(np, p, b);
2512                                 np += b;
2513                                 nb -= b;
2514                         }
2515                         np = zip->entry_names;
2516                         nl = ll;
2517
2518                         for (i = 0; i < zip->numFiles; i++) {
2519                                 entries[i].utf16name = np;
2520 #if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG)
2521                                 entries[i].wname = (wchar_t *)np;
2522 #endif
2523
2524                                 /* Find a terminator. */
2525                                 while (nl >= 2 && (np[0] || np[1])) {
2526                                         np += 2;
2527                                         nl -= 2;
2528                                 }
2529                                 if (nl < 2)
2530                                         return (-1);/* Terminator not found */
2531                                 entries[i].name_len = np - entries[i].utf16name;
2532                                 np += 2;
2533                                 nl -= 2;
2534                         }
2535                         break;
2536                 }
2537                 case kAttributes:
2538                 {
2539                         int allAreDefined;
2540
2541                         if ((p = header_bytes(a, 2)) == NULL)
2542                                 return (-1);
2543                         allAreDefined = *p;
2544                         if (h->attrBools != NULL)
2545                                 return (-1);
2546                         h->attrBools = calloc((size_t)zip->numFiles,
2547                             sizeof(*h->attrBools));
2548                         if (h->attrBools == NULL)
2549                                 return (-1);
2550                         if (allAreDefined)
2551                                 memset(h->attrBools, 1, (size_t)zip->numFiles);
2552                         else {
2553                                 if (read_Bools(a, h->attrBools,
2554                                       (size_t)zip->numFiles) < 0)
2555                                         return (-1);
2556                         }
2557                         for (i = 0; i < zip->numFiles; i++) {
2558                                 if (h->attrBools[i]) {
2559                                         if ((p = header_bytes(a, 4)) == NULL)
2560                                                 return (-1);
2561                                         entries[i].attr = archive_le32dec(p);
2562                                 }
2563                         }
2564                         break;
2565                 }
2566                 case kDummy:
2567                         if (ll == 0)
2568                                 break;
2569                         __LA_FALLTHROUGH;
2570                 default:
2571                         if (header_bytes(a, ll) == NULL)
2572                                 return (-1);
2573                         break;
2574                 }
2575         }
2576
2577         /*
2578          * Set up entry's attributes.
2579          */
2580         folders = si->ci.folders;
2581         eindex = sindex = 0;
2582         folderIndex = indexInFolder = 0;
2583         for (i = 0; i < zip->numFiles; i++) {
2584                 if (h->emptyStreamBools == NULL || h->emptyStreamBools[i] == 0)
2585                         entries[i].flg |= HAS_STREAM;
2586                 /* The high 16 bits of attributes is a posix file mode. */
2587                 entries[i].mode = entries[i].attr >> 16;
2588                 if (entries[i].flg & HAS_STREAM) {
2589                         if ((size_t)sindex >= si->ss.unpack_streams)
2590                                 return (-1);
2591                         if (entries[i].mode == 0)
2592                                 entries[i].mode = AE_IFREG | 0666;
2593                         if (si->ss.digestsDefined[sindex])
2594                                 entries[i].flg |= CRC32_IS_SET;
2595                         entries[i].ssIndex = sindex;
2596                         sindex++;
2597                 } else {
2598                         int dir;
2599                         if (h->emptyFileBools == NULL)
2600                                 dir = 1;
2601                         else {
2602                                 if (h->emptyFileBools[eindex])
2603                                         dir = 0;
2604                                 else
2605                                         dir = 1;
2606                                 eindex++;
2607                         }
2608                         if (entries[i].mode == 0) {
2609                                 if (dir)
2610                                         entries[i].mode = AE_IFDIR | 0777;
2611                                 else
2612                                         entries[i].mode = AE_IFREG | 0666;
2613                         } else if (dir &&
2614                             (entries[i].mode & AE_IFMT) != AE_IFDIR) {
2615                                 entries[i].mode &= ~AE_IFMT;
2616                                 entries[i].mode |= AE_IFDIR;
2617                         }
2618                         if ((entries[i].mode & AE_IFMT) == AE_IFDIR &&
2619                             entries[i].name_len >= 2 &&
2620                             (entries[i].utf16name[entries[i].name_len-2] != '/' ||
2621                              entries[i].utf16name[entries[i].name_len-1] != 0)) {
2622                                 entries[i].utf16name[entries[i].name_len] = '/';
2623                                 entries[i].utf16name[entries[i].name_len+1] = 0;
2624                                 entries[i].name_len += 2;
2625                         }
2626                         entries[i].ssIndex = -1;
2627                 }
2628                 if (entries[i].attr & 0x01)
2629                         entries[i].mode &= ~0222;/* Read only. */
2630
2631                 if ((entries[i].flg & HAS_STREAM) == 0 && indexInFolder == 0) {
2632                         /*
2633                          * The entry is an empty file or a directory file,
2634                          * those both have no contents.
2635                          */
2636                         entries[i].folderIndex = -1;
2637                         continue;
2638                 }
2639                 if (indexInFolder == 0) {
2640                         for (;;) {
2641                                 if (folderIndex >= si->ci.numFolders)
2642                                         return (-1);
2643                                 if (folders[folderIndex].numUnpackStreams)
2644                                         break;
2645                                 folderIndex++;
2646                         }
2647                 }
2648                 entries[i].folderIndex = folderIndex;
2649                 if ((entries[i].flg & HAS_STREAM) == 0)
2650                         continue;
2651                 indexInFolder++;
2652                 if (indexInFolder >= folders[folderIndex].numUnpackStreams) {
2653                         folderIndex++;
2654                         indexInFolder = 0;
2655                 }
2656         }
2657
2658         return (0);
2659 }
2660
2661 #define EPOC_TIME ARCHIVE_LITERAL_ULL(116444736000000000)
2662 static void
2663 fileTimeToUtc(uint64_t fileTime, time_t *timep, long *ns)
2664 {
2665
2666         if (fileTime >= EPOC_TIME) {
2667                 fileTime -= EPOC_TIME;
2668                 /* milli seconds base */
2669                 *timep = (time_t)(fileTime / 10000000);
2670                 /* nano seconds base */
2671                 *ns = (long)(fileTime % 10000000) * 100;
2672         } else {
2673                 *timep = 0;
2674                 *ns = 0;
2675         }
2676 }
2677
2678 static int
2679 read_Times(struct archive_read *a, struct _7z_header_info *h, int type)
2680 {
2681         struct _7zip *zip = (struct _7zip *)a->format->data;
2682         const unsigned char *p;
2683         struct _7zip_entry *entries = zip->entries;
2684         unsigned char *timeBools;
2685         int allAreDefined;
2686         unsigned i;
2687
2688         timeBools = calloc((size_t)zip->numFiles, sizeof(*timeBools));
2689         if (timeBools == NULL)
2690                 return (-1);
2691
2692         /* Read allAreDefined. */
2693         if ((p = header_bytes(a, 1)) == NULL)
2694                 goto failed;
2695         allAreDefined = *p;
2696         if (allAreDefined)
2697                 memset(timeBools, 1, (size_t)zip->numFiles);
2698         else {
2699                 if (read_Bools(a, timeBools, (size_t)zip->numFiles) < 0)
2700                         goto failed;
2701         }
2702
2703         /* Read external. */
2704         if ((p = header_bytes(a, 1)) == NULL)
2705                 goto failed;
2706         if (*p) {
2707                 if (parse_7zip_uint64(a, &(h->dataIndex)) < 0)
2708                         goto failed;
2709                 if (UMAX_ENTRY < h->dataIndex)
2710                         goto failed;
2711         }
2712
2713         for (i = 0; i < zip->numFiles; i++) {
2714                 if (!timeBools[i])
2715                         continue;
2716                 if ((p = header_bytes(a, 8)) == NULL)
2717                         goto failed;
2718                 switch (type) {
2719                 case kCTime:
2720                         fileTimeToUtc(archive_le64dec(p),
2721                             &(entries[i].ctime),
2722                             &(entries[i].ctime_ns));
2723                         entries[i].flg |= CTIME_IS_SET;
2724                         break;
2725                 case kATime:
2726                         fileTimeToUtc(archive_le64dec(p),
2727                             &(entries[i].atime),
2728                             &(entries[i].atime_ns));
2729                         entries[i].flg |= ATIME_IS_SET;
2730                         break;
2731                 case kMTime:
2732                         fileTimeToUtc(archive_le64dec(p),
2733                             &(entries[i].mtime),
2734                             &(entries[i].mtime_ns));
2735                         entries[i].flg |= MTIME_IS_SET;
2736                         break;
2737                 }
2738         }
2739
2740         free(timeBools);
2741         return (0);
2742 failed:
2743         free(timeBools);
2744         return (-1);
2745 }
2746
2747 static int
2748 decode_encoded_header_info(struct archive_read *a, struct _7z_stream_info *si)
2749 {
2750         struct _7zip *zip = (struct _7zip *)a->format->data;
2751
2752         errno = 0;
2753         if (read_StreamsInfo(a, si) < 0) {
2754                 if (errno == ENOMEM)
2755                         archive_set_error(&a->archive, -1,
2756                             "Couldn't allocate memory");
2757                 else
2758                         archive_set_error(&a->archive, -1,
2759                             "Malformed 7-Zip archive");
2760                 return (ARCHIVE_FATAL);
2761         }
2762
2763         if (si->pi.numPackStreams == 0 || si->ci.numFolders == 0) {
2764                 archive_set_error(&a->archive, -1, "Malformed 7-Zip archive");
2765                 return (ARCHIVE_FATAL);
2766         }
2767
2768         if (zip->header_offset < si->pi.pos + si->pi.sizes[0] ||
2769             (int64_t)(si->pi.pos + si->pi.sizes[0]) < 0 ||
2770             si->pi.sizes[0] == 0 || (int64_t)si->pi.pos < 0) {
2771                 archive_set_error(&a->archive, -1, "Malformed Header offset");
2772                 return (ARCHIVE_FATAL);
2773         }
2774
2775         return (ARCHIVE_OK);
2776 }
2777
2778 static const unsigned char *
2779 header_bytes(struct archive_read *a, size_t rbytes)
2780 {
2781         struct _7zip *zip = (struct _7zip *)a->format->data;
2782         const unsigned char *p;
2783
2784         if (zip->header_bytes_remaining < rbytes)
2785                 return (NULL);
2786         if (zip->pack_stream_bytes_unconsumed)
2787                 read_consume(a);
2788
2789         if (zip->header_is_encoded == 0) {
2790                 p = __archive_read_ahead(a, rbytes, NULL);
2791                 if (p == NULL)
2792                         return (NULL);
2793                 zip->header_bytes_remaining -= rbytes;
2794                 zip->pack_stream_bytes_unconsumed = rbytes;
2795         } else {
2796                 const void *buff;
2797                 ssize_t bytes;
2798
2799                 bytes = read_stream(a, &buff, rbytes, rbytes);
2800                 if (bytes <= 0)
2801                         return (NULL);
2802                 zip->header_bytes_remaining -= bytes;
2803                 p = buff;
2804         }
2805
2806         /* Update checksum */
2807         zip->header_crc32 = crc32(zip->header_crc32, p, (unsigned)rbytes);
2808         return (p);
2809 }
2810
2811 static int
2812 slurp_central_directory(struct archive_read *a, struct _7zip *zip,
2813     struct _7z_header_info *header)
2814 {
2815         const unsigned char *p;
2816         uint64_t next_header_offset;
2817         uint64_t next_header_size;
2818         uint32_t next_header_crc;
2819         ssize_t bytes_avail;
2820         int check_header_crc, r;
2821
2822         if ((p = __archive_read_ahead(a, 32, &bytes_avail)) == NULL)
2823                 return (ARCHIVE_FATAL);
2824
2825         if ((p[0] == 'M' && p[1] == 'Z') || memcmp(p, "\x7F\x45LF", 4) == 0) {
2826                 /* This is an executable ? Must be self-extracting... */
2827                 r = skip_sfx(a, bytes_avail);
2828                 if (r < ARCHIVE_WARN)
2829                         return (r);
2830                 if ((p = __archive_read_ahead(a, 32, &bytes_avail)) == NULL)
2831                         return (ARCHIVE_FATAL);
2832         }
2833         zip->seek_base += 32;
2834
2835         if (memcmp(p, _7ZIP_SIGNATURE, 6) != 0) {
2836                 archive_set_error(&a->archive, -1, "Not 7-Zip archive file");
2837                 return (ARCHIVE_FATAL);
2838         }
2839
2840         /* CRC check. */
2841         if (crc32(0, (const unsigned char *)p + 12, 20)
2842             != archive_le32dec(p + 8)) {
2843                 archive_set_error(&a->archive, -1, "Header CRC error");
2844                 return (ARCHIVE_FATAL);
2845         }
2846
2847         next_header_offset = archive_le64dec(p + 12);
2848         next_header_size = archive_le64dec(p + 20);
2849         next_header_crc = archive_le32dec(p + 28);
2850
2851         if (next_header_size == 0)
2852                 /* There is no entry in an archive file. */
2853                 return (ARCHIVE_EOF);
2854
2855         if (((int64_t)next_header_offset) < 0) {
2856                 archive_set_error(&a->archive, -1, "Malformed 7-Zip archive");
2857                 return (ARCHIVE_FATAL);
2858         }
2859         __archive_read_consume(a, 32);
2860         if (next_header_offset != 0) {
2861                 if (bytes_avail >= (ssize_t)next_header_offset)
2862                         __archive_read_consume(a, next_header_offset);
2863                 else if (__archive_read_seek(a,
2864                     next_header_offset + zip->seek_base, SEEK_SET) < 0)
2865                         return (ARCHIVE_FATAL);
2866         }
2867         zip->stream_offset = next_header_offset;
2868         zip->header_offset = next_header_offset;
2869         zip->header_bytes_remaining = next_header_size;
2870         zip->header_crc32 = 0;
2871         zip->header_is_encoded = 0;
2872         zip->header_is_being_read = 1;
2873         zip->has_encrypted_entries = 0;
2874         check_header_crc = 1;
2875
2876         if ((p = header_bytes(a, 1)) == NULL) {
2877                 archive_set_error(&a->archive,
2878                     ARCHIVE_ERRNO_FILE_FORMAT,
2879                     "Truncated 7-Zip file body");
2880                 return (ARCHIVE_FATAL);
2881         }
2882         /* Parse ArchiveProperties. */
2883         switch (p[0]) {
2884         case kEncodedHeader:
2885                 /*
2886                  * The archive has an encoded header and we have to decode it
2887                  * in order to parse the header correctly.
2888                  */
2889                 r = decode_encoded_header_info(a, &(zip->si));
2890
2891                 /* Check the EncodedHeader CRC.*/
2892                 if (r == 0 && zip->header_crc32 != next_header_crc) {
2893                         archive_set_error(&a->archive, -1,
2894                             "Damaged 7-Zip archive");
2895                         r = -1;
2896                 }
2897                 if (r == 0) {
2898                         if (zip->si.ci.folders[0].digest_defined)
2899                                 next_header_crc = zip->si.ci.folders[0].digest;
2900                         else
2901                                 check_header_crc = 0;
2902                         if (zip->pack_stream_bytes_unconsumed)
2903                                 read_consume(a);
2904                         r = setup_decode_folder(a, zip->si.ci.folders, 1);
2905                         if (r == 0) {
2906                                 zip->header_bytes_remaining =
2907                                         zip->folder_outbytes_remaining;
2908                                 r = seek_pack(a);
2909                         }
2910                 }
2911                 /* Clean up StreamsInfo. */
2912                 free_StreamsInfo(&(zip->si));
2913                 memset(&(zip->si), 0, sizeof(zip->si));
2914                 if (r < 0)
2915                         return (ARCHIVE_FATAL);
2916                 zip->header_is_encoded = 1;
2917                 zip->header_crc32 = 0;
2918                 /* FALL THROUGH */
2919         case kHeader:
2920                 /*
2921                  * Parse the header.
2922                  */
2923                 errno = 0;
2924                 r = read_Header(a, header, zip->header_is_encoded);
2925                 if (r < 0) {
2926                         if (errno == ENOMEM)
2927                                 archive_set_error(&a->archive, -1,
2928                                     "Couldn't allocate memory");
2929                         else
2930                                 archive_set_error(&a->archive, -1,
2931                                     "Damaged 7-Zip archive");
2932                         return (ARCHIVE_FATAL);
2933                 }
2934
2935                 /*
2936                  *  Must be kEnd.
2937                  */
2938                 if ((p = header_bytes(a, 1)) == NULL ||*p != kEnd) {
2939                         archive_set_error(&a->archive, -1,
2940                             "Malformed 7-Zip archive");
2941                         return (ARCHIVE_FATAL);
2942                 }
2943
2944                 /* Check the Header CRC.*/
2945                 if (check_header_crc && zip->header_crc32 != next_header_crc) {
2946                         archive_set_error(&a->archive, -1,
2947                             "Malformed 7-Zip archive");
2948                         return (ARCHIVE_FATAL);
2949                 }
2950                 break;
2951         default:
2952                 archive_set_error(&a->archive, -1,
2953                     "Unexpected Property ID = %X", p[0]);
2954                 return (ARCHIVE_FATAL);
2955         }
2956
2957         /* Clean up variables be used for decoding the archive header */
2958         zip->pack_stream_remaining = 0;
2959         zip->pack_stream_index = 0;
2960         zip->folder_outbytes_remaining = 0;
2961         zip->uncompressed_buffer_bytes_remaining = 0;
2962         zip->pack_stream_bytes_unconsumed = 0;
2963         zip->header_is_being_read = 0;
2964
2965         return (ARCHIVE_OK);
2966 }
2967
2968 static ssize_t
2969 get_uncompressed_data(struct archive_read *a, const void **buff, size_t size,
2970     size_t minimum)
2971 {
2972         struct _7zip *zip = (struct _7zip *)a->format->data;
2973         ssize_t bytes_avail;
2974
2975         if (zip->codec == _7Z_COPY && zip->codec2 == (unsigned long)-1) {
2976                 /* Copy mode. */
2977
2978                 *buff = __archive_read_ahead(a, minimum, &bytes_avail);
2979                 if (bytes_avail <= 0) {
2980                         archive_set_error(&a->archive,
2981                             ARCHIVE_ERRNO_FILE_FORMAT,
2982                             "Truncated 7-Zip file data");
2983                         return (ARCHIVE_FATAL);
2984                 }
2985                 if ((size_t)bytes_avail >
2986                     zip->uncompressed_buffer_bytes_remaining)
2987                         bytes_avail = (ssize_t)
2988                             zip->uncompressed_buffer_bytes_remaining;
2989                 if ((size_t)bytes_avail > size)
2990                         bytes_avail = (ssize_t)size;
2991
2992                 zip->pack_stream_bytes_unconsumed = bytes_avail;
2993         } else if (zip->uncompressed_buffer_pointer == NULL) {
2994                 /* Decompression has failed. */
2995                 archive_set_error(&(a->archive),
2996                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
2997                 return (ARCHIVE_FATAL);
2998         } else {
2999                 /* Packed mode. */
3000                 if (minimum > zip->uncompressed_buffer_bytes_remaining) {
3001                         /*
3002                          * If remaining uncompressed data size is less than
3003                          * the minimum size, fill the buffer up to the
3004                          * minimum size.
3005                          */
3006                         if (extract_pack_stream(a, minimum) < 0)
3007                                 return (ARCHIVE_FATAL);
3008                 }
3009                 if (size > zip->uncompressed_buffer_bytes_remaining)
3010                         bytes_avail = (ssize_t)
3011                             zip->uncompressed_buffer_bytes_remaining;
3012                 else
3013                         bytes_avail = (ssize_t)size;
3014                 *buff = zip->uncompressed_buffer_pointer;
3015                 zip->uncompressed_buffer_pointer += bytes_avail;
3016         }
3017         zip->uncompressed_buffer_bytes_remaining -= bytes_avail;
3018         return (bytes_avail);
3019 }
3020
3021 static ssize_t
3022 extract_pack_stream(struct archive_read *a, size_t minimum)
3023 {
3024         struct _7zip *zip = (struct _7zip *)a->format->data;
3025         ssize_t bytes_avail;
3026         int r;
3027
3028         if (zip->codec == _7Z_COPY && zip->codec2 == (unsigned long)-1) {
3029                 if (minimum == 0)
3030                         minimum = 1;
3031                 if (__archive_read_ahead(a, minimum, &bytes_avail) == NULL
3032                     || bytes_avail <= 0) {
3033                         archive_set_error(&a->archive,
3034                             ARCHIVE_ERRNO_FILE_FORMAT,
3035                             "Truncated 7-Zip file body");
3036                         return (ARCHIVE_FATAL);
3037                 }
3038                 if ((uint64_t)bytes_avail > zip->pack_stream_inbytes_remaining)
3039                         bytes_avail = (ssize_t)zip->pack_stream_inbytes_remaining;
3040                 zip->pack_stream_inbytes_remaining -= bytes_avail;
3041                 if ((uint64_t)bytes_avail > zip->folder_outbytes_remaining)
3042                         bytes_avail = (ssize_t)zip->folder_outbytes_remaining;
3043                 zip->folder_outbytes_remaining -= bytes_avail;
3044                 zip->uncompressed_buffer_bytes_remaining = bytes_avail;
3045                 return (ARCHIVE_OK);
3046         }
3047
3048         /* If the buffer hasn't been allocated, allocate it now. */
3049         if (zip->uncompressed_buffer == NULL) {
3050                 zip->uncompressed_buffer_size = UBUFF_SIZE;
3051                 if (zip->uncompressed_buffer_size < minimum) {
3052                         zip->uncompressed_buffer_size = minimum + 1023;
3053                         zip->uncompressed_buffer_size &= ~0x3ff;
3054                 }
3055                 zip->uncompressed_buffer =
3056                     malloc(zip->uncompressed_buffer_size);
3057                 if (zip->uncompressed_buffer == NULL) {
3058                         archive_set_error(&a->archive, ENOMEM,
3059                             "No memory for 7-Zip decompression");
3060                         return (ARCHIVE_FATAL);
3061                 }
3062                 zip->uncompressed_buffer_bytes_remaining = 0;
3063         } else if (zip->uncompressed_buffer_size < minimum ||
3064             zip->uncompressed_buffer_bytes_remaining < minimum) {
3065                 /*
3066                  * Make sure the uncompressed buffer can have bytes
3067                  * at least `minimum' bytes.
3068                  * NOTE: This case happen when reading the header.
3069                  */
3070                 size_t used;
3071                 if (zip->uncompressed_buffer_pointer != 0)
3072                         used = zip->uncompressed_buffer_pointer -
3073                                 zip->uncompressed_buffer;
3074                 else
3075                         used = 0;
3076                 if (zip->uncompressed_buffer_size < minimum) {
3077                         /*
3078                          * Expand the uncompressed buffer up to
3079                          * the minimum size.
3080                          */
3081                         void *p;
3082                         size_t new_size;
3083
3084                         new_size = minimum + 1023;
3085                         new_size &= ~0x3ff;
3086                         p = realloc(zip->uncompressed_buffer, new_size);
3087                         if (p == NULL) {
3088                                 archive_set_error(&a->archive, ENOMEM,
3089                                     "No memory for 7-Zip decompression");
3090                                 return (ARCHIVE_FATAL);
3091                         }
3092                         zip->uncompressed_buffer = (unsigned char *)p;
3093                         zip->uncompressed_buffer_size = new_size;
3094                 }
3095                 /*
3096                  * Move unconsumed bytes to the head.
3097                  */
3098                 if (used) {
3099                         memmove(zip->uncompressed_buffer,
3100                                 zip->uncompressed_buffer + used,
3101                                 zip->uncompressed_buffer_bytes_remaining);
3102                 }
3103         } else
3104                 zip->uncompressed_buffer_bytes_remaining = 0;
3105         zip->uncompressed_buffer_pointer = NULL;
3106         for (;;) {
3107                 size_t bytes_in, bytes_out;
3108                 const void *buff_in;
3109                 unsigned char *buff_out;
3110                 int end_of_data;
3111
3112                 /*
3113                  * Note: '1' here is a performance optimization.
3114                  * Recall that the decompression layer returns a count of
3115                  * available bytes; asking for more than that forces the
3116                  * decompressor to combine reads by copying data.
3117                  */
3118                 buff_in = __archive_read_ahead(a, 1, &bytes_avail);
3119                 if (bytes_avail <= 0) {
3120                         archive_set_error(&a->archive,
3121                             ARCHIVE_ERRNO_FILE_FORMAT,
3122                             "Truncated 7-Zip file body");
3123                         return (ARCHIVE_FATAL);
3124                 }
3125
3126                 buff_out = zip->uncompressed_buffer
3127                         + zip->uncompressed_buffer_bytes_remaining;
3128                 bytes_out = zip->uncompressed_buffer_size
3129                         - zip->uncompressed_buffer_bytes_remaining;
3130                 bytes_in = bytes_avail;
3131                 if (bytes_in > zip->pack_stream_inbytes_remaining)
3132                         bytes_in = (size_t)zip->pack_stream_inbytes_remaining;
3133                 /* Drive decompression. */
3134                 r = decompress(a, zip, buff_out, &bytes_out,
3135                         buff_in, &bytes_in);
3136                 switch (r) {
3137                 case ARCHIVE_OK:
3138                         end_of_data = 0;
3139                         break;
3140                 case ARCHIVE_EOF:
3141                         end_of_data = 1;
3142                         break;
3143                 default:
3144                         return (ARCHIVE_FATAL);
3145                 }
3146                 zip->pack_stream_inbytes_remaining -= bytes_in;
3147                 if (bytes_out > zip->folder_outbytes_remaining)
3148                         bytes_out = (size_t)zip->folder_outbytes_remaining;
3149                 zip->folder_outbytes_remaining -= bytes_out;
3150                 zip->uncompressed_buffer_bytes_remaining += bytes_out;
3151                 zip->pack_stream_bytes_unconsumed = bytes_in;
3152
3153                 /*
3154                  * Continue decompression until uncompressed_buffer is full.
3155                  */
3156                 if (zip->uncompressed_buffer_bytes_remaining ==
3157                     zip->uncompressed_buffer_size)
3158                         break;
3159                 if (zip->codec2 == _7Z_X86 && zip->odd_bcj_size &&
3160                     zip->uncompressed_buffer_bytes_remaining + 5 >
3161                     zip->uncompressed_buffer_size)
3162                         break;
3163                 if (zip->pack_stream_inbytes_remaining == 0 &&
3164                     zip->folder_outbytes_remaining == 0)
3165                         break;
3166                 if (end_of_data || (bytes_in == 0 && bytes_out == 0)) {
3167                         archive_set_error(&(a->archive),
3168                             ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3169                         return (ARCHIVE_FATAL);
3170                 }
3171                 read_consume(a);
3172         }
3173         if (zip->uncompressed_buffer_bytes_remaining < minimum) {
3174                 archive_set_error(&(a->archive),
3175                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3176                 return (ARCHIVE_FATAL);
3177         }
3178         zip->uncompressed_buffer_pointer = zip->uncompressed_buffer;
3179         return (ARCHIVE_OK);
3180 }
3181
3182 static int
3183 seek_pack(struct archive_read *a)
3184 {
3185         struct _7zip *zip = (struct _7zip *)a->format->data;
3186         int64_t pack_offset;
3187
3188         if (zip->pack_stream_remaining <= 0) {
3189                 archive_set_error(&(a->archive),
3190                     ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive");
3191                 return (ARCHIVE_FATAL);
3192         }
3193         zip->pack_stream_inbytes_remaining =
3194             zip->si.pi.sizes[zip->pack_stream_index];
3195         pack_offset = zip->si.pi.positions[zip->pack_stream_index];
3196         if (zip->stream_offset != pack_offset) {
3197                 if (0 > __archive_read_seek(a, pack_offset + zip->seek_base,
3198                     SEEK_SET))
3199                         return (ARCHIVE_FATAL);
3200                 zip->stream_offset = pack_offset;
3201         }
3202         zip->pack_stream_index++;
3203         zip->pack_stream_remaining--;
3204         return (ARCHIVE_OK);
3205 }
3206
3207 static ssize_t
3208 read_stream(struct archive_read *a, const void **buff, size_t size,
3209     size_t minimum)
3210 {
3211         struct _7zip *zip = (struct _7zip *)a->format->data;
3212         uint64_t skip_bytes = 0;
3213         ssize_t r;
3214
3215         if (zip->uncompressed_buffer_bytes_remaining == 0) {
3216                 if (zip->pack_stream_inbytes_remaining > 0) {
3217                         r = extract_pack_stream(a, 0);
3218                         if (r < 0)
3219                                 return (r);
3220                         return (get_uncompressed_data(a, buff, size, minimum));
3221                 } else if (zip->folder_outbytes_remaining > 0) {
3222                         /* Extract a remaining pack stream. */
3223                         r = extract_pack_stream(a, 0);
3224                         if (r < 0)
3225                                 return (r);
3226                         return (get_uncompressed_data(a, buff, size, minimum));
3227                 }
3228         } else
3229                 return (get_uncompressed_data(a, buff, size, minimum));
3230
3231         /*
3232          * Current pack stream has been consumed.
3233          */
3234         if (zip->pack_stream_remaining == 0) {
3235                 if (zip->header_is_being_read) {
3236                         /* Invalid sequence. This might happen when
3237                          * reading a malformed archive. */
3238                         archive_set_error(&(a->archive),
3239                             ARCHIVE_ERRNO_MISC, "Malformed 7-Zip archive");
3240                         return (ARCHIVE_FATAL);
3241                 }
3242
3243                 /*
3244                  * All current folder's pack streams have been
3245                  * consumed. Switch to next folder.
3246                  */
3247                 if (zip->folder_index == 0 &&
3248                     (zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes
3249                      || zip->folder_index != zip->entry->folderIndex)) {
3250                         zip->folder_index = zip->entry->folderIndex;
3251                         skip_bytes =
3252                             zip->si.ci.folders[zip->folder_index].skipped_bytes;
3253                 }
3254
3255                 if (zip->folder_index >= zip->si.ci.numFolders) {
3256                         /*
3257                          * We have consumed all folders and its pack streams.
3258                          */
3259                         *buff = NULL;
3260                         return (0);
3261                 }
3262                 r = setup_decode_folder(a,
3263                         &(zip->si.ci.folders[zip->folder_index]), 0);
3264                 if (r != ARCHIVE_OK)
3265                         return (ARCHIVE_FATAL);
3266
3267                 zip->folder_index++;
3268         }
3269
3270         /*
3271          * Switch to next pack stream.
3272          */
3273         r = seek_pack(a);
3274         if (r < 0)
3275                 return (r);
3276
3277         /* Extract a new pack stream. */
3278         r = extract_pack_stream(a, 0);
3279         if (r < 0)
3280                 return (r);
3281
3282         /*
3283          * Skip the bytes we already has skipped in skip_stream().
3284          */
3285         while (skip_bytes) {
3286                 ssize_t skipped;
3287
3288                 if (zip->uncompressed_buffer_bytes_remaining == 0) {
3289                         if (zip->pack_stream_inbytes_remaining > 0) {
3290                                 r = extract_pack_stream(a, 0);
3291                                 if (r < 0)
3292                                         return (r);
3293                         } else if (zip->folder_outbytes_remaining > 0) {
3294                                 /* Extract a remaining pack stream. */
3295                                 r = extract_pack_stream(a, 0);
3296                                 if (r < 0)
3297                                         return (r);
3298                         } else {
3299                                 archive_set_error(&a->archive,
3300                                     ARCHIVE_ERRNO_FILE_FORMAT,
3301                                     "Truncated 7-Zip file body");
3302                                 return (ARCHIVE_FATAL);
3303                         }
3304                 }
3305                 skipped = get_uncompressed_data(
3306                         a, buff, (size_t)skip_bytes, 0);
3307                 if (skipped < 0)
3308                         return (skipped);
3309                 skip_bytes -= skipped;
3310                 if (zip->pack_stream_bytes_unconsumed)
3311                         read_consume(a);
3312         }
3313
3314         return (get_uncompressed_data(a, buff, size, minimum));
3315 }
3316
3317 static int
3318 setup_decode_folder(struct archive_read *a, struct _7z_folder *folder,
3319     int header)
3320 {
3321         struct _7zip *zip = (struct _7zip *)a->format->data;
3322         const struct _7z_coder *coder1, *coder2;
3323         const char *cname = (header)?"archive header":"file content";
3324         unsigned i;
3325         int r, found_bcj2 = 0;
3326
3327         /*
3328          * Release the memory which the previous folder used for BCJ2.
3329          */
3330         for (i = 0; i < 3; i++) {
3331                 free(zip->sub_stream_buff[i]);
3332                 zip->sub_stream_buff[i] = NULL;
3333         }
3334
3335         /*
3336          * Initialize a stream reader.
3337          */
3338         zip->pack_stream_remaining = (unsigned)folder->numPackedStreams;
3339         zip->pack_stream_index = (unsigned)folder->packIndex;
3340         zip->folder_outbytes_remaining = folder_uncompressed_size(folder);
3341         zip->uncompressed_buffer_bytes_remaining = 0;
3342
3343         /*
3344          * Check coder types.
3345          */
3346         for (i = 0; i < folder->numCoders; i++) {
3347                 switch(folder->coders[i].codec) {
3348                         case _7Z_CRYPTO_MAIN_ZIP:
3349                         case _7Z_CRYPTO_RAR_29:
3350                         case _7Z_CRYPTO_AES_256_SHA_256: {
3351                                 /* For entry that is associated with this folder, mark
3352                                    it as encrypted (data+metadata). */
3353                                 zip->has_encrypted_entries = 1;
3354                                 if (a->entry) {
3355                                         archive_entry_set_is_data_encrypted(a->entry, 1);
3356                                         archive_entry_set_is_metadata_encrypted(a->entry, 1);
3357                                 }
3358                                 archive_set_error(&(a->archive),
3359                                         ARCHIVE_ERRNO_MISC,
3360                                         "The %s is encrypted, "
3361                                         "but currently not supported", cname);
3362                                 return (ARCHIVE_FATAL);
3363                         }
3364                         case _7Z_X86_BCJ2: {
3365                                 found_bcj2++;
3366                                 break;
3367                         }
3368                 }
3369         }
3370         /* Now that we've checked for encryption, if there were still no
3371          * encrypted entries found we can say for sure that there are none.
3372          */
3373         if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
3374                 zip->has_encrypted_entries = 0;
3375         }
3376
3377         if ((folder->numCoders > 2 && !found_bcj2) || found_bcj2 > 1) {
3378                 archive_set_error(&(a->archive),
3379                     ARCHIVE_ERRNO_MISC,
3380                     "The %s is encoded with many filters, "
3381                     "but currently not supported", cname);
3382                 return (ARCHIVE_FATAL);
3383         }
3384         coder1 = &(folder->coders[0]);
3385         if (folder->numCoders == 2)
3386                 coder2 = &(folder->coders[1]);
3387         else
3388                 coder2 = NULL;
3389
3390         if (found_bcj2) {
3391                 /*
3392                  * Preparation to decode BCJ2.
3393                  * Decoding BCJ2 requires four sources. Those are at least,
3394                  * as far as I know, two types of the storage form.
3395                  */
3396                 const struct _7z_coder *fc = folder->coders;
3397                 static const struct _7z_coder coder_copy = {0, 1, 1, 0, NULL};
3398                 const struct _7z_coder *scoder[3] =
3399                         {&coder_copy, &coder_copy, &coder_copy};
3400                 const void *buff;
3401                 ssize_t bytes;
3402                 unsigned char *b[3] = {NULL, NULL, NULL};
3403                 uint64_t sunpack[3] ={-1, -1, -1};
3404                 size_t s[3] = {0, 0, 0};
3405                 int idx[3] = {0, 1, 2};
3406
3407                 if (folder->numCoders == 4 && fc[3].codec == _7Z_X86_BCJ2 &&
3408                     folder->numInStreams == 7 && folder->numOutStreams == 4 &&
3409                     zip->pack_stream_remaining == 4) {
3410                         /* Source type 1 made by 7zr or 7z with -m options. */
3411                         if (folder->bindPairs[0].inIndex == 5) {
3412                                 /* The form made by 7zr */
3413                                 idx[0] = 1; idx[1] = 2; idx[2] = 0;
3414                                 scoder[1] = &(fc[1]);
3415                                 scoder[2] = &(fc[0]);
3416                                 sunpack[1] = folder->unPackSize[1];
3417                                 sunpack[2] = folder->unPackSize[0];
3418                                 coder1 = &(fc[2]);
3419                         } else {
3420                                 /*
3421                                  * NOTE: Some patterns do not work.
3422                                  * work:
3423                                  *  7z a -m0=BCJ2 -m1=COPY -m2=COPY
3424                                  *       -m3=(any)
3425                                  *  7z a -m0=BCJ2 -m1=COPY -m2=(any)
3426                                  *       -m3=COPY
3427                                  *  7z a -m0=BCJ2 -m1=(any) -m2=COPY
3428                                  *       -m3=COPY
3429                                  * not work:
3430                                  *  other patterns.
3431                                  *
3432                                  * We have to handle this like `pipe' or
3433                                  * our libarchive7s filter frame work,
3434                                  * decoding the BCJ2 main stream sequentially,
3435                                  * m3 -> m2 -> m1 -> BCJ2.
3436                                  *
3437                                  */
3438                                 if (fc[0].codec == _7Z_COPY &&
3439                                     fc[1].codec == _7Z_COPY)
3440                                         coder1 = &(folder->coders[2]);
3441                                 else if (fc[0].codec == _7Z_COPY &&
3442                                     fc[2].codec == _7Z_COPY)
3443                                         coder1 = &(folder->coders[1]);
3444                                 else if (fc[1].codec == _7Z_COPY &&
3445                                     fc[2].codec == _7Z_COPY)
3446                                         coder1 = &(folder->coders[0]);
3447                                 else {
3448                                         archive_set_error(&(a->archive),
3449                                             ARCHIVE_ERRNO_MISC,
3450                                             "Unsupported form of "
3451                                             "BCJ2 streams");
3452                                         return (ARCHIVE_FATAL);
3453                                 }
3454                         }
3455                         coder2 = &(fc[3]);
3456                         zip->main_stream_bytes_remaining =
3457                                 (size_t)folder->unPackSize[2];
3458                 } else if (coder2 != NULL && coder2->codec == _7Z_X86_BCJ2 &&
3459                     zip->pack_stream_remaining == 4 &&
3460                     folder->numInStreams == 5 && folder->numOutStreams == 2) {
3461                         /* Source type 0 made by 7z */
3462                         zip->main_stream_bytes_remaining =
3463                                 (size_t)folder->unPackSize[0];
3464                 } else {
3465                         /* We got an unexpected form. */
3466                         archive_set_error(&(a->archive),
3467                             ARCHIVE_ERRNO_MISC,
3468                             "Unsupported form of BCJ2 streams");
3469                         return (ARCHIVE_FATAL);
3470                 }
3471
3472                 /* Skip the main stream at this time. */
3473                 if ((r = seek_pack(a)) < 0)
3474                         return (r);
3475                 zip->pack_stream_bytes_unconsumed =
3476                     (size_t)zip->pack_stream_inbytes_remaining;
3477                 read_consume(a);
3478
3479                 /* Read following three sub streams. */
3480                 for (i = 0; i < 3; i++) {
3481                         const struct _7z_coder *coder = scoder[i];
3482
3483                         if ((r = seek_pack(a)) < 0) {
3484                                 free(b[0]); free(b[1]); free(b[2]);
3485                                 return (r);
3486                         }
3487
3488                         if (sunpack[i] == (uint64_t)-1)
3489                                 zip->folder_outbytes_remaining =
3490                                     zip->pack_stream_inbytes_remaining;
3491                         else
3492                                 zip->folder_outbytes_remaining = sunpack[i];
3493
3494                         r = init_decompression(a, zip, coder, NULL);
3495                         if (r != ARCHIVE_OK) {
3496                                 free(b[0]); free(b[1]); free(b[2]);
3497                                 return (ARCHIVE_FATAL);
3498                         }
3499
3500                         /* Allocate memory for the decoded data of a sub
3501                          * stream. */
3502                         b[i] = malloc((size_t)zip->folder_outbytes_remaining);
3503                         if (b[i] == NULL) {
3504                                 free(b[0]); free(b[1]); free(b[2]);
3505                                 archive_set_error(&a->archive, ENOMEM,
3506                                     "No memory for 7-Zip decompression");
3507                                 return (ARCHIVE_FATAL);
3508                         }
3509
3510                         /* Extract a sub stream. */
3511                         while (zip->pack_stream_inbytes_remaining > 0) {
3512                                 r = (int)extract_pack_stream(a, 0);
3513                                 if (r < 0) {
3514                                         free(b[0]); free(b[1]); free(b[2]);
3515                                         return (r);
3516                                 }
3517                                 bytes = get_uncompressed_data(a, &buff,
3518                                     zip->uncompressed_buffer_bytes_remaining,
3519                                     0);
3520                                 if (bytes < 0) {
3521                                         free(b[0]); free(b[1]); free(b[2]);
3522                                         return ((int)bytes);
3523                                 }
3524                                 memcpy(b[i]+s[i], buff, bytes);
3525                                 s[i] += bytes;
3526                                 if (zip->pack_stream_bytes_unconsumed)
3527                                         read_consume(a);
3528                         }
3529                 }
3530
3531                 /* Set the sub streams to the right place. */
3532                 for (i = 0; i < 3; i++) {
3533                         zip->sub_stream_buff[i] = b[idx[i]];
3534                         zip->sub_stream_size[i] = s[idx[i]];
3535                         zip->sub_stream_bytes_remaining[i] = s[idx[i]];
3536                 }
3537
3538                 /* Allocate memory used for decoded main stream bytes. */
3539                 if (zip->tmp_stream_buff == NULL) {
3540                         zip->tmp_stream_buff_size = 32 * 1024;
3541                         zip->tmp_stream_buff =
3542                             malloc(zip->tmp_stream_buff_size);
3543                         if (zip->tmp_stream_buff == NULL) {
3544                                 archive_set_error(&a->archive, ENOMEM,
3545                                     "No memory for 7-Zip decompression");
3546                                 return (ARCHIVE_FATAL);
3547                         }
3548                 }
3549                 zip->tmp_stream_bytes_avail = 0;
3550                 zip->tmp_stream_bytes_remaining = 0;
3551                 zip->odd_bcj_size = 0;
3552                 zip->bcj2_outPos = 0;
3553
3554                 /*
3555                  * Reset a stream reader in order to read the main stream
3556                  * of BCJ2.
3557                  */
3558                 zip->pack_stream_remaining = 1;
3559                 zip->pack_stream_index = (unsigned)folder->packIndex;
3560                 zip->folder_outbytes_remaining =
3561                     folder_uncompressed_size(folder);
3562                 zip->uncompressed_buffer_bytes_remaining = 0;
3563         }
3564
3565         /*
3566          * Initialize the decompressor for the new folder's pack streams.
3567          */
3568         r = init_decompression(a, zip, coder1, coder2);
3569         if (r != ARCHIVE_OK)
3570                 return (ARCHIVE_FATAL);
3571         return (ARCHIVE_OK);
3572 }
3573
3574 static int64_t
3575 skip_stream(struct archive_read *a, size_t skip_bytes)
3576 {
3577         struct _7zip *zip = (struct _7zip *)a->format->data;
3578         const void *p;
3579         int64_t skipped_bytes;
3580         size_t bytes = skip_bytes;
3581
3582         if (zip->folder_index == 0) {
3583                 /*
3584                  * Optimization for a list mode.
3585                  * Avoid unnecessary decoding operations.
3586                  */
3587                 zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes
3588                     += skip_bytes;
3589                 return (skip_bytes);
3590         }
3591
3592         while (bytes) {
3593                 skipped_bytes = read_stream(a, &p, bytes, 0);
3594                 if (skipped_bytes < 0)
3595                         return (skipped_bytes);
3596                 if (skipped_bytes == 0) {
3597                         archive_set_error(&a->archive,
3598                             ARCHIVE_ERRNO_FILE_FORMAT,
3599                             "Truncated 7-Zip file body");
3600                         return (ARCHIVE_FATAL);
3601                 }
3602                 bytes -= (size_t)skipped_bytes;
3603                 if (zip->pack_stream_bytes_unconsumed)
3604                         read_consume(a);
3605         }
3606         return (skip_bytes);
3607 }
3608
3609 /*
3610  * Brought from LZMA SDK.
3611  *
3612  * Bra86.c -- Converter for x86 code (BCJ)
3613  * 2008-10-04 : Igor Pavlov : Public domain
3614  *
3615  */
3616
3617 #define Test86MSByte(b) ((b) == 0 || (b) == 0xFF)
3618
3619 static void
3620 x86_Init(struct _7zip *zip)
3621 {
3622         zip->bcj_state = 0;
3623         zip->bcj_prevPosT = (size_t)0 - 1;
3624         zip->bcj_prevMask = 0;
3625         zip->bcj_ip = 5;
3626 }
3627
3628 static size_t
3629 x86_Convert(struct _7zip *zip, uint8_t *data, size_t size)
3630 {
3631         static const uint8_t kMaskToAllowedStatus[8] = {1, 1, 1, 0, 1, 0, 0, 0};
3632         static const uint8_t kMaskToBitNumber[8] = {0, 1, 2, 2, 3, 3, 3, 3};
3633         size_t bufferPos, prevPosT;
3634         uint32_t ip, prevMask;
3635
3636         if (size < 5)
3637                 return 0;
3638
3639         bufferPos = 0;
3640         prevPosT = zip->bcj_prevPosT;
3641         prevMask = zip->bcj_prevMask;
3642         ip = zip->bcj_ip;
3643
3644         for (;;) {
3645                 uint8_t *p = data + bufferPos;
3646                 uint8_t *limit = data + size - 4;
3647
3648                 for (; p < limit; p++)
3649                         if ((*p & 0xFE) == 0xE8)
3650                                 break;
3651                 bufferPos = (size_t)(p - data);
3652                 if (p >= limit)
3653                         break;
3654                 prevPosT = bufferPos - prevPosT;
3655                 if (prevPosT > 3)
3656                         prevMask = 0;
3657                 else {
3658                         prevMask = (prevMask << ((int)prevPosT - 1)) & 0x7;
3659                         if (prevMask != 0) {
3660                                 unsigned char b =
3661                                         p[4 - kMaskToBitNumber[prevMask]];
3662                                 if (!kMaskToAllowedStatus[prevMask] ||
3663                                     Test86MSByte(b)) {
3664                                         prevPosT = bufferPos;
3665                                         prevMask = ((prevMask << 1) & 0x7) | 1;
3666                                         bufferPos++;
3667                                         continue;
3668                                 }
3669                         }
3670                 }
3671                 prevPosT = bufferPos;
3672
3673                 if (Test86MSByte(p[4])) {
3674                         uint32_t src = ((uint32_t)p[4] << 24) |
3675                                 ((uint32_t)p[3] << 16) | ((uint32_t)p[2] << 8) |
3676                                 ((uint32_t)p[1]);
3677                         uint32_t dest;
3678                         for (;;) {
3679                                 uint8_t b;
3680                                 int b_index;
3681
3682                                 dest = src - (ip + (uint32_t)bufferPos);
3683                                 if (prevMask == 0)
3684                                         break;
3685                                 b_index = kMaskToBitNumber[prevMask] * 8;
3686                                 b = (uint8_t)(dest >> (24 - b_index));
3687                                 if (!Test86MSByte(b))
3688                                         break;
3689                                 src = dest ^ ((1 << (32 - b_index)) - 1);
3690                         }
3691                         p[4] = (uint8_t)(~(((dest >> 24) & 1) - 1));
3692                         p[3] = (uint8_t)(dest >> 16);
3693                         p[2] = (uint8_t)(dest >> 8);
3694                         p[1] = (uint8_t)dest;
3695                         bufferPos += 5;
3696                 } else {
3697                         prevMask = ((prevMask << 1) & 0x7) | 1;
3698                         bufferPos++;
3699                 }
3700         }
3701         zip->bcj_prevPosT = prevPosT;
3702         zip->bcj_prevMask = prevMask;
3703         zip->bcj_ip += (uint32_t)bufferPos;
3704         return (bufferPos);
3705 }
3706
3707 /*
3708  * Brought from LZMA SDK.
3709  *
3710  * Bcj2.c -- Converter for x86 code (BCJ2)
3711  * 2008-10-04 : Igor Pavlov : Public domain
3712  *
3713  */
3714
3715 #define SZ_ERROR_DATA    ARCHIVE_FAILED
3716
3717 #define IsJcc(b0, b1) ((b0) == 0x0F && ((b1) & 0xF0) == 0x80)
3718 #define IsJ(b0, b1) ((b1 & 0xFE) == 0xE8 || IsJcc(b0, b1))
3719
3720 #define kNumTopBits 24
3721 #define kTopValue ((uint32_t)1 << kNumTopBits)
3722
3723 #define kNumBitModelTotalBits 11
3724 #define kBitModelTotal (1 << kNumBitModelTotalBits)
3725 #define kNumMoveBits 5
3726
3727 #define RC_READ_BYTE (*buffer++)
3728 #define RC_TEST { if (buffer == bufferLim) return SZ_ERROR_DATA; }
3729 #define RC_INIT2 zip->bcj2_code = 0; zip->bcj2_range = 0xFFFFFFFF; \
3730   { int ii; for (ii = 0; ii < 5; ii++) { RC_TEST; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; }}
3731
3732 #define NORMALIZE if (zip->bcj2_range < kTopValue) { RC_TEST; zip->bcj2_range <<= 8; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; }
3733
3734 #define IF_BIT_0(p) ttt = *(p); bound = (zip->bcj2_range >> kNumBitModelTotalBits) * ttt; if (zip->bcj2_code < bound)
3735 #define UPDATE_0(p) zip->bcj2_range = bound; *(p) = (CProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits)); NORMALIZE;
3736 #define UPDATE_1(p) zip->bcj2_range -= bound; zip->bcj2_code -= bound; *(p) = (CProb)(ttt - (ttt >> kNumMoveBits)); NORMALIZE;
3737
3738 static ssize_t
3739 Bcj2_Decode(struct _7zip *zip, uint8_t *outBuf, size_t outSize)
3740 {
3741         size_t inPos = 0, outPos = 0;
3742         const uint8_t *buf0, *buf1, *buf2, *buf3;
3743         size_t size0, size1, size2, size3;
3744         const uint8_t *buffer, *bufferLim;
3745         unsigned int i, j;
3746
3747         size0 = zip->tmp_stream_bytes_remaining;
3748         buf0 = zip->tmp_stream_buff + zip->tmp_stream_bytes_avail - size0;
3749         size1 = zip->sub_stream_bytes_remaining[0];
3750         buf1 = zip->sub_stream_buff[0] + zip->sub_stream_size[0] - size1;
3751         size2 = zip->sub_stream_bytes_remaining[1];
3752         buf2 = zip->sub_stream_buff[1] + zip->sub_stream_size[1] - size2;
3753         size3 = zip->sub_stream_bytes_remaining[2];
3754         buf3 = zip->sub_stream_buff[2] + zip->sub_stream_size[2] - size3;
3755
3756         buffer = buf3;
3757         bufferLim = buffer + size3;
3758
3759         if (zip->bcj_state == 0) {
3760                 /*
3761                  * Initialize.
3762                  */
3763                 zip->bcj2_prevByte = 0;
3764                 for (i = 0;
3765                     i < sizeof(zip->bcj2_p) / sizeof(zip->bcj2_p[0]); i++)
3766                         zip->bcj2_p[i] = kBitModelTotal >> 1;
3767                 RC_INIT2;
3768                 zip->bcj_state = 1;
3769         }
3770
3771         /*
3772          * Gather the odd bytes of a previous call.
3773          */
3774         for (i = 0; zip->odd_bcj_size > 0 && outPos < outSize; i++) {
3775                 outBuf[outPos++] = zip->odd_bcj[i];
3776                 zip->odd_bcj_size--;
3777         }
3778
3779         if (outSize == 0) {
3780                 zip->bcj2_outPos += outPos;
3781                 return (outPos);
3782         }
3783
3784         for (;;) {
3785                 uint8_t b;
3786                 CProb *prob;
3787                 uint32_t bound;
3788                 uint32_t ttt;
3789
3790                 size_t limit = size0 - inPos;
3791                 if (outSize - outPos < limit)
3792                         limit = outSize - outPos;
3793
3794                 if (zip->bcj_state == 1) {
3795                         while (limit != 0) {
3796                                 uint8_t bb = buf0[inPos];
3797                                 outBuf[outPos++] = bb;
3798                                 if (IsJ(zip->bcj2_prevByte, bb)) {
3799                                         zip->bcj_state = 2;
3800                                         break;
3801                                 }
3802                                 inPos++;
3803                                 zip->bcj2_prevByte = bb;
3804                                 limit--;
3805                         }
3806                 }
3807
3808                 if (limit == 0 || outPos == outSize)
3809                         break;
3810                 zip->bcj_state = 1;
3811
3812                 b = buf0[inPos++];
3813
3814                 if (b == 0xE8)
3815                         prob = zip->bcj2_p + zip->bcj2_prevByte;
3816                 else if (b == 0xE9)
3817                         prob = zip->bcj2_p + 256;
3818                 else
3819                         prob = zip->bcj2_p + 257;
3820
3821                 IF_BIT_0(prob) {
3822                         UPDATE_0(prob)
3823                         zip->bcj2_prevByte = b;
3824                 } else {
3825                         uint32_t dest;
3826                         const uint8_t *v;
3827                         uint8_t out[4];
3828
3829                         UPDATE_1(prob)
3830                         if (b == 0xE8) {
3831                                 v = buf1;
3832                                 if (size1 < 4)
3833                                         return SZ_ERROR_DATA;
3834                                 buf1 += 4;
3835                                 size1 -= 4;
3836                         } else {
3837                                 v = buf2;
3838                                 if (size2 < 4)
3839                                         return SZ_ERROR_DATA;
3840                                 buf2 += 4;
3841                                 size2 -= 4;
3842                         }
3843                         dest = (((uint32_t)v[0] << 24) |
3844                             ((uint32_t)v[1] << 16) |
3845                             ((uint32_t)v[2] << 8) |
3846                             ((uint32_t)v[3])) -
3847                             ((uint32_t)zip->bcj2_outPos + (uint32_t)outPos + 4);
3848                         out[0] = (uint8_t)dest;
3849                         out[1] = (uint8_t)(dest >> 8);
3850                         out[2] = (uint8_t)(dest >> 16);
3851                         out[3] = zip->bcj2_prevByte = (uint8_t)(dest >> 24);
3852
3853                         for (i = 0; i < 4 && outPos < outSize; i++)
3854                                 outBuf[outPos++] = out[i];
3855                         if (i < 4) {
3856                                 /*
3857                                  * Save odd bytes which we could not add into
3858                                  * the output buffer because of out of space.
3859                                  */
3860                                 zip->odd_bcj_size = 4 -i;
3861                                 for (; i < 4; i++) {
3862                                         j = i - 4 + (unsigned)zip->odd_bcj_size;
3863                                         zip->odd_bcj[j] = out[i];
3864                                 }
3865                                 break;
3866                         }
3867                 }
3868         }
3869         zip->tmp_stream_bytes_remaining -= inPos;
3870         zip->sub_stream_bytes_remaining[0] = size1;
3871         zip->sub_stream_bytes_remaining[1] = size2;
3872         zip->sub_stream_bytes_remaining[2] = bufferLim - buffer;
3873         zip->bcj2_outPos += outPos;
3874
3875         return ((ssize_t)outPos);
3876 }
3877