contrib/libarchive/libarchive/archive_read_support_format_zip.c

   1 /*-
   2  * Copyright (c) 2004-2013 Tim Kientzle
   3  * Copyright (c) 2011-2012,2014 Michihiro NAKAJIMA
   4  * Copyright (c) 2013 Konrad Kleine
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "archive_platform.h"
  29 __FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_zip.c 201102 2009-12-28 03:11:36Z kientzle $");
  30
  31 /*
  32  * The definitive documentation of the Zip file format is:
  33  *   http://www.pkware.com/documents/casestudies/APPNOTE.TXT
  34  *
  35  * The Info-Zip project has pioneered various extensions to better
  36  * support Zip on Unix, including the 0x5455 "UT", 0x5855 "UX", 0x7855
  37  * "Ux", and 0x7875 "ux" extensions for time and ownership
  38  * information.
  39  *
  40  * History of this code: The streaming Zip reader was first added to
  41  * libarchive in January 2005.  Support for seekable input sources was
  42  * added in Nov 2011.  Zip64 support (including a significant code
  43  * refactoring) was added in 2014.
  44  */
  45
  46 #ifdef HAVE_ERRNO_H
  47 #include <errno.h>
  48 #endif
  49 #ifdef HAVE_STDLIB_H
  50 #include <stdlib.h>
  51 #endif
  52 #ifdef HAVE_ZLIB_H
  53 #include <zlib.h>
  54 #endif
  55 #ifdef HAVE_BZLIB_H
  56 #include <bzlib.h>
  57 #endif
  58 #ifdef HAVE_LZMA_H
  59 #include <lzma.h>
  60 #endif
  61 #ifdef HAVE_ZSTD_H
  62 #include <zstd.h>
  63 #endif
  64
  65 #include "archive.h"
  66 #include "archive_digest_private.h"
  67 #include "archive_cryptor_private.h"
  68 #include "archive_endian.h"
  69 #include "archive_entry.h"
  70 #include "archive_entry_locale.h"
  71 #include "archive_hmac_private.h"
  72 #include "archive_private.h"
  73 #include "archive_rb.h"
  74 #include "archive_read_private.h"
  75 #include "archive_ppmd8_private.h"
  76
  77 #ifndef HAVE_ZLIB_H
  78 #include "archive_crc32.h"
  79 #endif
  80
  81 struct zip_entry {
  82         struct archive_rb_node  node;
  83         struct zip_entry        *next;
  84         int64_t                 local_header_offset;
  85         int64_t                 compressed_size;
  86         int64_t                 uncompressed_size;
  87         int64_t                 gid;
  88         int64_t                 uid;
  89         struct archive_string   rsrcname;
  90         time_t                  mtime;
  91         time_t                  atime;
  92         time_t                  ctime;
  93         uint32_t                crc32;
  94         uint16_t                mode;
  95         uint16_t                zip_flags; /* From GP Flags Field */
  96         unsigned char           compression;
  97         unsigned char           system; /* From "version written by" */
  98         unsigned char           flags; /* Our extra markers. */
  99         unsigned char           decdat;/* Used for Decryption check */
 100
 101         /* WinZip AES encryption extra field should be available
 102          * when compression is 99. */
 103         struct {
 104                 /* Vendor version: AE-1 - 0x0001, AE-2 - 0x0002 */
 105                 unsigned        vendor;
 106 #define AES_VENDOR_AE_1 0x0001
 107 #define AES_VENDOR_AE_2 0x0002
 108                 /* AES encryption strength:
 109                  * 1 - 128 bits, 2 - 192 bits, 2 - 256 bits. */
 110                 unsigned        strength;
 111                 /* Actual compression method. */
 112                 unsigned char   compression;
 113         }                       aes_extra;
 114 };
 115
 116 struct trad_enc_ctx {
 117         uint32_t        keys[3];
 118 };
 119
 120 /* Bits used in zip_flags. */
 121 #define ZIP_ENCRYPTED   (1 << 0)
 122 #define ZIP_LENGTH_AT_END       (1 << 3)
 123 #define ZIP_STRONG_ENCRYPTED    (1 << 6)
 124 #define ZIP_UTF8_NAME   (1 << 11)
 125 /* See "7.2 Single Password Symmetric Encryption Method"
 126    in http://www.pkware.com/documents/casestudies/APPNOTE.TXT */
 127 #define ZIP_CENTRAL_DIRECTORY_ENCRYPTED (1 << 13)
 128
 129 /* Bits used in flags. */
 130 #define LA_USED_ZIP64   (1 << 0)
 131 #define LA_FROM_CENTRAL_DIRECTORY (1 << 1)
 132
 133 /*
 134  * See "WinZip - AES Encryption Information"
 135  *     http://www.winzip.com/aes_info.htm
 136  */
 137 /* Value used in compression method. */
 138 #define WINZIP_AES_ENCRYPTION   99
 139 /* Authentication code size. */
 140 #define AUTH_CODE_SIZE  10
 141 /**/
 142 #define MAX_DERIVED_KEY_BUF_SIZE        (AES_MAX_KEY_SIZE * 2 + 2)
 143
 144 struct zip {
 145         /* Structural information about the archive. */
 146         struct archive_string   format_name;
 147         int64_t                 central_directory_offset;
 148         int64_t                 central_directory_offset_adjusted;
 149         size_t                  central_directory_entries_total;
 150         size_t                  central_directory_entries_on_this_disk;
 151         int                     has_encrypted_entries;
 152
 153         /* List of entries (seekable Zip only) */
 154         struct zip_entry        *zip_entries;
 155         struct archive_rb_tree  tree;
 156         struct archive_rb_tree  tree_rsrc;
 157
 158         /* Bytes read but not yet consumed via __archive_read_consume() */
 159         size_t                  unconsumed;
 160
 161         /* Information about entry we're currently reading. */
 162         struct zip_entry        *entry;
 163         int64_t                 entry_bytes_remaining;
 164
 165         /* These count the number of bytes actually read for the entry. */
 166         int64_t                 entry_compressed_bytes_read;
 167         int64_t                 entry_uncompressed_bytes_read;
 168
 169         /* Running CRC32 of the decompressed data */
 170         unsigned long           entry_crc32;
 171         unsigned long           (*crc32func)(unsigned long, const void *,
 172                                     size_t);
 173         char                    ignore_crc32;
 174
 175         /* Flags to mark progress of decompression. */
 176         char                    decompress_init;
 177         char                    end_of_entry;
 178
 179         unsigned char           *uncompressed_buffer;
 180         size_t                  uncompressed_buffer_size;
 181
 182 #ifdef HAVE_ZLIB_H
 183         z_stream                stream;
 184         char                    stream_valid;
 185 #endif
 186
 187 #if HAVE_LZMA_H && HAVE_LIBLZMA
 188         lzma_stream             zipx_lzma_stream;
 189         char            zipx_lzma_valid;
 190 #endif
 191
 192 #ifdef HAVE_BZLIB_H
 193         bz_stream               bzstream;
 194         char            bzstream_valid;
 195 #endif
 196
 197 #if HAVE_ZSTD_H && HAVE_LIBZSTD
 198         ZSTD_DStream    *zstdstream;
 199         char            zstdstream_valid;
 200 #endif
 201
 202         IByteIn                 zipx_ppmd_stream;
 203         ssize_t                 zipx_ppmd_read_compressed;
 204         CPpmd8                  ppmd8;
 205         char                    ppmd8_valid;
 206         char                    ppmd8_stream_failed;
 207
 208         struct archive_string_conv *sconv;
 209         struct archive_string_conv *sconv_default;
 210         struct archive_string_conv *sconv_utf8;
 211         int                     init_default_conversion;
 212         int                     process_mac_extensions;
 213
 214         char                    init_decryption;
 215
 216         /* Decryption buffer. */
 217         /*
 218          * The decrypted data starts at decrypted_ptr and
 219          * extends for decrypted_bytes_remaining.  Decryption
 220          * adds new data to the end of this block, data is returned
 221          * to clients from the beginning.  When the block hits the
 222          * end of decrypted_buffer, it has to be shuffled back to
 223          * the beginning of the buffer.
 224          */
 225         unsigned char           *decrypted_buffer;
 226         unsigned char           *decrypted_ptr;
 227         size_t                  decrypted_buffer_size;
 228         size_t                  decrypted_bytes_remaining;
 229         size_t                  decrypted_unconsumed_bytes;
 230
 231         /* Traditional PKWARE decryption. */
 232         struct trad_enc_ctx     tctx;
 233         char                    tctx_valid;
 234
 235         /* WinZip AES decryption. */
 236         /* Contexts used for AES decryption. */
 237         archive_crypto_ctx      cctx;
 238         char                    cctx_valid;
 239         archive_hmac_sha1_ctx   hctx;
 240         char                    hctx_valid;
 241
 242         /* Strong encryption's decryption header information. */
 243         unsigned                iv_size;
 244         unsigned                alg_id;
 245         unsigned                bit_len;
 246         unsigned                flags;
 247         unsigned                erd_size;
 248         unsigned                v_size;
 249         unsigned                v_crc32;
 250         uint8_t                 *iv;
 251         uint8_t                 *erd;
 252         uint8_t                 *v_data;
 253 };
 254
 255 /* Many systems define min or MIN, but not all. */
 256 #define zipmin(a,b) ((a) < (b) ? (a) : (b))
 257
 258 #ifdef HAVE_ZLIB_H
 259 static int
 260 zip_read_data_deflate(struct archive_read *a, const void **buff,
 261         size_t *size, int64_t *offset);
 262 #endif
 263 #if HAVE_LZMA_H && HAVE_LIBLZMA
 264 static int
 265 zip_read_data_zipx_lzma_alone(struct archive_read *a, const void **buff,
 266         size_t *size, int64_t *offset);
 267 #endif
 268
 269 /* This function is used by Ppmd8_DecodeSymbol during decompression of Ppmd8
 270  * streams inside ZIP files. It has 2 purposes: one is to fetch the next
 271  * compressed byte from the stream, second one is to increase the counter how
 272  * many compressed bytes were read. */
 273 static Byte
 274 ppmd_read(void* p) {
 275         /* Get the handle to current decompression context. */
 276         struct archive_read *a = ((IByteIn*)p)->a;
 277         struct zip *zip = (struct zip*) a->format->data;
 278         ssize_t bytes_avail = 0;
 279
 280         /* Fetch next byte. */
 281         const uint8_t* data = __archive_read_ahead(a, 1, &bytes_avail);
 282         if(bytes_avail < 1) {
 283                 zip->ppmd8_stream_failed = 1;
 284                 return 0;
 285         }
 286
 287         __archive_read_consume(a, 1);
 288
 289         /* Increment the counter. */
 290         ++zip->zipx_ppmd_read_compressed;
 291
 292         /* Return the next compressed byte. */
 293         return data[0];
 294 }
 295
 296 /* ------------------------------------------------------------------------ */
 297
 298 /*
 299   Traditional PKWARE Decryption functions.
 300  */
 301
 302 static void
 303 trad_enc_update_keys(struct trad_enc_ctx *ctx, uint8_t c)
 304 {
 305         uint8_t t;
 306 #define CRC32(c, b) (crc32(c ^ 0xffffffffUL, &b, 1) ^ 0xffffffffUL)
 307
 308         ctx->keys[0] = CRC32(ctx->keys[0], c);
 309         ctx->keys[1] = (ctx->keys[1] + (ctx->keys[0] & 0xff)) * 134775813L + 1;
 310         t = (ctx->keys[1] >> 24) & 0xff;
 311         ctx->keys[2] = CRC32(ctx->keys[2], t);
 312 #undef CRC32
 313 }
 314
 315 static uint8_t
 316 trad_enc_decrypt_byte(struct trad_enc_ctx *ctx)
 317 {
 318         unsigned temp = ctx->keys[2] | 2;
 319         return (uint8_t)((temp * (temp ^ 1)) >> 8) & 0xff;
 320 }
 321
 322 static void
 323 trad_enc_decrypt_update(struct trad_enc_ctx *ctx, const uint8_t *in,
 324     size_t in_len, uint8_t *out, size_t out_len)
 325 {
 326         unsigned i, max;
 327
 328         max = (unsigned)((in_len < out_len)? in_len: out_len);
 329
 330         for (i = 0; i < max; i++) {
 331                 uint8_t t = in[i] ^ trad_enc_decrypt_byte(ctx);
 332                 out[i] = t;
 333                 trad_enc_update_keys(ctx, t);
 334         }
 335 }
 336
 337 static int
 338 trad_enc_init(struct trad_enc_ctx *ctx, const char *pw, size_t pw_len,
 339     const uint8_t *key, size_t key_len, uint8_t *crcchk)
 340 {
 341         uint8_t header[12];
 342
 343         if (key_len < 12) {
 344                 *crcchk = 0xff;
 345                 return -1;
 346         }
 347
 348         ctx->keys[0] = 305419896L;
 349         ctx->keys[1] = 591751049L;
 350         ctx->keys[2] = 878082192L;
 351
 352         for (;pw_len; --pw_len)
 353                 trad_enc_update_keys(ctx, *pw++);
 354
 355         trad_enc_decrypt_update(ctx, key, 12, header, 12);
 356         /* Return the last byte for CRC check. */
 357         *crcchk = header[11];
 358         return 0;
 359 }
 360
 361 #if 0
 362 static void
 363 crypt_derive_key_sha1(const void *p, int size, unsigned char *key,
 364     int key_size)
 365 {
 366 #define MD_SIZE 20
 367         archive_sha1_ctx ctx;
 368         unsigned char md1[MD_SIZE];
 369         unsigned char md2[MD_SIZE * 2];
 370         unsigned char mkb[64];
 371         int i;
 372
 373         archive_sha1_init(&ctx);
 374         archive_sha1_update(&ctx, p, size);
 375         archive_sha1_final(&ctx, md1);
 376
 377         memset(mkb, 0x36, sizeof(mkb));
 378         for (i = 0; i < MD_SIZE; i++)
 379                 mkb[i] ^= md1[i];
 380         archive_sha1_init(&ctx);
 381         archive_sha1_update(&ctx, mkb, sizeof(mkb));
 382         archive_sha1_final(&ctx, md2);
 383
 384         memset(mkb, 0x5C, sizeof(mkb));
 385         for (i = 0; i < MD_SIZE; i++)
 386                 mkb[i] ^= md1[i];
 387         archive_sha1_init(&ctx);
 388         archive_sha1_update(&ctx, mkb, sizeof(mkb));
 389         archive_sha1_final(&ctx, md2 + MD_SIZE);
 390
 391         if (key_size > 32)
 392                 key_size = 32;
 393         memcpy(key, md2, key_size);
 394 #undef MD_SIZE
 395 }
 396 #endif
 397
 398 /*
 399  * Common code for streaming or seeking modes.
 400  *
 401  * Includes code to read local file headers, decompress data
 402  * from entry bodies, and common API.
 403  */
 404
 405 static unsigned long
 406 real_crc32(unsigned long crc, const void *buff, size_t len)
 407 {
 408         return crc32(crc, buff, (unsigned int)len);
 409 }
 410
 411 /* Used by "ignorecrc32" option to speed up tests. */
 412 static unsigned long
 413 fake_crc32(unsigned long crc, const void *buff, size_t len)
 414 {
 415         (void)crc; /* UNUSED */
 416         (void)buff; /* UNUSED */
 417         (void)len; /* UNUSED */
 418         return 0;
 419 }
 420
 421 static const struct {
 422         int id;
 423         const char * name;
 424 } compression_methods[] = {
 425         {0, "uncompressed"}, /* The file is stored (no compression) */
 426         {1, "shrinking"}, /* The file is Shrunk */
 427         {2, "reduced-1"}, /* The file is Reduced with compression factor 1 */
 428         {3, "reduced-2"}, /* The file is Reduced with compression factor 2 */
 429         {4, "reduced-3"}, /* The file is Reduced with compression factor 3 */
 430         {5, "reduced-4"}, /* The file is Reduced with compression factor 4 */
 431         {6, "imploded"},  /* The file is Imploded */
 432         {7, "reserved"},  /* Reserved for Tokenizing compression algorithm */
 433         {8, "deflation"}, /* The file is Deflated */
 434         {9, "deflation-64-bit"}, /* Enhanced Deflating using Deflate64(tm) */
 435         {10, "ibm-terse"},/* PKWARE Data Compression Library Imploding
 436                            * (old IBM TERSE) */
 437         {11, "reserved"}, /* Reserved by PKWARE */
 438         {12, "bzip"},     /* File is compressed using BZIP2 algorithm */
 439         {13, "reserved"}, /* Reserved by PKWARE */
 440         {14, "lzma"},     /* LZMA (EFS) */
 441         {15, "reserved"}, /* Reserved by PKWARE */
 442         {16, "reserved"}, /* Reserved by PKWARE */
 443         {17, "reserved"}, /* Reserved by PKWARE */
 444         {18, "ibm-terse-new"}, /* File is compressed using IBM TERSE (new) */
 445         {19, "ibm-lz777"},/* IBM LZ77 z Architecture (PFS) */
 446         {93, "zstd"},     /*  Zstandard (zstd) Compression */
 447         {95, "xz"},       /* XZ compressed data */
 448         {96, "jpeg"},     /* JPEG compressed data */
 449         {97, "wav-pack"}, /* WavPack compressed data */
 450         {98, "ppmd-1"},   /* PPMd version I, Rev 1 */
 451         {99, "aes"}       /* WinZip AES encryption  */
 452 };
 453
 454 static const char *
 455 compression_name(const int compression)
 456 {
 457         static const int num_compression_methods =
 458                 sizeof(compression_methods)/sizeof(compression_methods[0]);
 459         int i=0;
 460
 461         while(compression >= 0 && i < num_compression_methods) {
 462                 if (compression_methods[i].id == compression)
 463                         return compression_methods[i].name;
 464                 i++;
 465         }
 466         return "??";
 467 }
 468
 469 /* Convert an MSDOS-style date/time into Unix-style time. */
 470 static time_t
 471 zip_time(const char *p)
 472 {
 473         int msTime, msDate;
 474         struct tm ts;
 475
 476         msTime = (0xff & (unsigned)p[0]) + 256 * (0xff & (unsigned)p[1]);
 477         msDate = (0xff & (unsigned)p[2]) + 256 * (0xff & (unsigned)p[3]);
 478
 479         memset(&ts, 0, sizeof(ts));
 480         ts.tm_year = ((msDate >> 9) & 0x7f) + 80; /* Years since 1900. */
 481         ts.tm_mon = ((msDate >> 5) & 0x0f) - 1; /* Month number. */
 482         ts.tm_mday = msDate & 0x1f; /* Day of month. */
 483         ts.tm_hour = (msTime >> 11) & 0x1f;
 484         ts.tm_min = (msTime >> 5) & 0x3f;
 485         ts.tm_sec = (msTime << 1) & 0x3e;
 486         ts.tm_isdst = -1;
 487         return mktime(&ts);
 488 }
 489
 490 /*
 491  * The extra data is stored as a list of
 492  *      id1+size1+data1 + id2+size2+data2 ...
 493  *  triplets.  id and size are 2 bytes each.
 494  */
 495 static int
 496 process_extra(struct archive_read *a, struct archive_entry *entry,
 497      const char *p, size_t extra_length, struct zip_entry* zip_entry)
 498 {
 499         unsigned offset = 0;
 500         struct zip *zip = (struct zip *)(a->format->data);
 501
 502         if (extra_length == 0) {
 503                 return ARCHIVE_OK;
 504         }
 505
 506         if (extra_length < 4) {
 507                 size_t i = 0;
 508                 /* Some ZIP files may have trailing 0 bytes. Let's check they
 509                  * are all 0 and ignore them instead of returning an error.
 510                  *
 511                  * This is not technically correct, but some ZIP files look
 512                  * like this and other tools support those files - so let's
 513                  * also  support them.
 514                  */
 515                 for (; i < extra_length; i++) {
 516                         if (p[i] != 0) {
 517                                 archive_set_error(&a->archive,
 518                                     ARCHIVE_ERRNO_FILE_FORMAT,
 519                                     "Too-small extra data: "
 520                                     "Need at least 4 bytes, "
 521                                     "but only found %d bytes",
 522                                     (int)extra_length);
 523                                 return ARCHIVE_FAILED;
 524                         }
 525                 }
 526
 527                 return ARCHIVE_OK;
 528         }
 529
 530         while (offset <= extra_length - 4) {
 531                 unsigned short headerid = archive_le16dec(p + offset);
 532                 unsigned short datasize = archive_le16dec(p + offset + 2);
 533
 534                 offset += 4;
 535                 if (offset + datasize > extra_length) {
 536                         archive_set_error(&a->archive,
 537                             ARCHIVE_ERRNO_FILE_FORMAT, "Extra data overflow: "
 538                             "Need %d bytes but only found %d bytes",
 539                             (int)datasize, (int)(extra_length - offset));
 540                         return ARCHIVE_FAILED;
 541                 }
 542 #ifdef DEBUG
 543                 fprintf(stderr, "Header id 0x%04x, length %d\n",
 544                     headerid, datasize);
 545 #endif
 546                 switch (headerid) {
 547                 case 0x0001:
 548                         /* Zip64 extended information extra field. */
 549                         zip_entry->flags |= LA_USED_ZIP64;
 550                         if (zip_entry->uncompressed_size == 0xffffffff) {
 551                                 uint64_t t = 0;
 552                                 if (datasize < 8
 553                                     || (t = archive_le64dec(p + offset)) >
 554                                     INT64_MAX) {
 555                                         archive_set_error(&a->archive,
 556                                             ARCHIVE_ERRNO_FILE_FORMAT,
 557                                             "Malformed 64-bit "
 558                                             "uncompressed size");
 559                                         return ARCHIVE_FAILED;
 560                                 }
 561                                 zip_entry->uncompressed_size = t;
 562                                 offset += 8;
 563                                 datasize -= 8;
 564                         }
 565                         if (zip_entry->compressed_size == 0xffffffff) {
 566                                 uint64_t t = 0;
 567                                 if (datasize < 8
 568                                     || (t = archive_le64dec(p + offset)) >
 569                                     INT64_MAX) {
 570                                         archive_set_error(&a->archive,
 571                                             ARCHIVE_ERRNO_FILE_FORMAT,
 572                                             "Malformed 64-bit "
 573                                             "compressed size");
 574                                         return ARCHIVE_FAILED;
 575                                 }
 576                                 zip_entry->compressed_size = t;
 577                                 offset += 8;
 578                                 datasize -= 8;
 579                         }
 580                         if (zip_entry->local_header_offset == 0xffffffff) {
 581                                 uint64_t t = 0;
 582                                 if (datasize < 8
 583                                     || (t = archive_le64dec(p + offset)) >
 584                                     INT64_MAX) {
 585                                         archive_set_error(&a->archive,
 586                                             ARCHIVE_ERRNO_FILE_FORMAT,
 587                                             "Malformed 64-bit "
 588                                             "local header offset");
 589                                         return ARCHIVE_FAILED;
 590                                 }
 591                                 zip_entry->local_header_offset = t;
 592                                 offset += 8;
 593                                 datasize -= 8;
 594                         }
 595                         /* archive_le32dec(p + offset) gives disk
 596                          * on which file starts, but we don't handle
 597                          * multi-volume Zip files. */
 598                         break;
 599 #ifdef DEBUG
 600                 case 0x0017:
 601                 {
 602                         /* Strong encryption field. */
 603                         if (archive_le16dec(p + offset) == 2) {
 604                                 unsigned algId =
 605                                         archive_le16dec(p + offset + 2);
 606                                 unsigned bitLen =
 607                                         archive_le16dec(p + offset + 4);
 608                                 int      flags =
 609                                         archive_le16dec(p + offset + 6);
 610                                 fprintf(stderr, "algId=0x%04x, bitLen=%u, "
 611                                     "flgas=%d\n", algId, bitLen,flags);
 612                         }
 613                         break;
 614                 }
 615 #endif
 616                 case 0x5455:
 617                 {
 618                         /* Extended time field "UT". */
 619                         int flags;
 620                         if (datasize == 0) {
 621                                 archive_set_error(&a->archive,
 622                                     ARCHIVE_ERRNO_FILE_FORMAT,
 623                                     "Incomplete extended time field");
 624                                 return ARCHIVE_FAILED;
 625                         }
 626                         flags = p[offset];
 627                         offset++;
 628                         datasize--;
 629                         /* Flag bits indicate which dates are present. */
 630                         if (flags & 0x01)
 631                         {
 632 #ifdef DEBUG
 633                                 fprintf(stderr, "mtime: %lld -> %d\n",
 634                                     (long long)zip_entry->mtime,
 635                                     archive_le32dec(p + offset));
 636 #endif
 637                                 if (datasize < 4)
 638                                         break;
 639                                 zip_entry->mtime = archive_le32dec(p + offset);
 640                                 offset += 4;
 641                                 datasize -= 4;
 642                         }
 643                         if (flags & 0x02)
 644                         {
 645                                 if (datasize < 4)
 646                                         break;
 647                                 zip_entry->atime = archive_le32dec(p + offset);
 648                                 offset += 4;
 649                                 datasize -= 4;
 650                         }
 651                         if (flags & 0x04)
 652                         {
 653                                 if (datasize < 4)
 654                                         break;
 655                                 zip_entry->ctime = archive_le32dec(p + offset);
 656                                 offset += 4;
 657                                 datasize -= 4;
 658                         }
 659                         break;
 660                 }
 661                 case 0x5855:
 662                 {
 663                         /* Info-ZIP Unix Extra Field (old version) "UX". */
 664                         if (datasize >= 8) {
 665                                 zip_entry->atime = archive_le32dec(p + offset);
 666                                 zip_entry->mtime =
 667                                     archive_le32dec(p + offset + 4);
 668                         }
 669                         if (datasize >= 12) {
 670                                 zip_entry->uid =
 671                                     archive_le16dec(p + offset + 8);
 672                                 zip_entry->gid =
 673                                     archive_le16dec(p + offset + 10);
 674                         }
 675                         break;
 676                 }
 677                 case 0x6c78:
 678                 {
 679                         /* Experimental 'xl' field */
 680                         /*
 681                          * Introduced Dec 2013 to provide a way to
 682                          * include external file attributes (and other
 683                          * fields that ordinarily appear only in
 684                          * central directory) in local file header.
 685                          * This provides file type and permission
 686                          * information necessary to support full
 687                          * streaming extraction.  Currently being
 688                          * discussed with other Zip developers
 689                          * ... subject to change.
 690                          *
 691                          * Format:
 692                          *  The field starts with a bitmap that specifies
 693                          *  which additional fields are included.  The
 694                          *  bitmap is variable length and can be extended in
 695                          *  the future.
 696                          *
 697                          *  n bytes - feature bitmap: first byte has low-order
 698                          *    7 bits.  If high-order bit is set, a subsequent
 699                          *    byte holds the next 7 bits, etc.
 700                          *
 701                          *  if bitmap & 1, 2 byte "version made by"
 702                          *  if bitmap & 2, 2 byte "internal file attributes"
 703                          *  if bitmap & 4, 4 byte "external file attributes"
 704                          *  if bitmap & 8, 2 byte comment length + n byte
 705                          *  comment
 706                          */
 707                         int bitmap, bitmap_last;
 708
 709                         if (datasize < 1)
 710                                 break;
 711                         bitmap_last = bitmap = 0xff & p[offset];
 712                         offset += 1;
 713                         datasize -= 1;
 714
 715                         /* We only support first 7 bits of bitmap; skip rest. */
 716                         while ((bitmap_last & 0x80) != 0
 717                             && datasize >= 1) {
 718                                 bitmap_last = p[offset];
 719                                 offset += 1;
 720                                 datasize -= 1;
 721                         }
 722
 723                         if (bitmap & 1) {
 724                                 /* 2 byte "version made by" */
 725                                 if (datasize < 2)
 726                                         break;
 727                                 zip_entry->system
 728                                     = archive_le16dec(p + offset) >> 8;
 729                                 offset += 2;
 730                                 datasize -= 2;
 731                         }
 732                         if (bitmap & 2) {
 733                                 /* 2 byte "internal file attributes" */
 734                                 uint32_t internal_attributes;
 735                                 if (datasize < 2)
 736                                         break;
 737                                 internal_attributes
 738                                     = archive_le16dec(p + offset);
 739                                 /* Not used by libarchive at present. */
 740                                 (void)internal_attributes; /* UNUSED */
 741                                 offset += 2;
 742                                 datasize -= 2;
 743                         }
 744                         if (bitmap & 4) {
 745                                 /* 4 byte "external file attributes" */
 746                                 uint32_t external_attributes;
 747                                 if (datasize < 4)
 748                                         break;
 749                                 external_attributes
 750                                     = archive_le32dec(p + offset);
 751                                 if (zip_entry->system == 3) {
 752                                         zip_entry->mode
 753                                             = external_attributes >> 16;
 754                                 } else if (zip_entry->system == 0) {
 755                                         // Interpret MSDOS directory bit
 756                                         if (0x10 == (external_attributes &
 757                                             0x10)) {
 758                                                 zip_entry->mode =
 759                                                     AE_IFDIR | 0775;
 760                                         } else {
 761                                                 zip_entry->mode =
 762                                                     AE_IFREG | 0664;
 763                                         }
 764                                         if (0x01 == (external_attributes &
 765                                             0x01)) {
 766                                                 /* Read-only bit;
 767                                                  * strip write permissions */
 768                                                 zip_entry->mode &= 0555;
 769                                         }
 770                                 } else {
 771                                         zip_entry->mode = 0;
 772                                 }
 773                                 offset += 4;
 774                                 datasize -= 4;
 775                         }
 776                         if (bitmap & 8) {
 777                                 /* 2 byte comment length + comment */
 778                                 uint32_t comment_length;
 779                                 if (datasize < 2)
 780                                         break;
 781                                 comment_length
 782                                     = archive_le16dec(p + offset);
 783                                 offset += 2;
 784                                 datasize -= 2;
 785
 786                                 if (datasize < comment_length)
 787                                         break;
 788                                 /* Comment is not supported by libarchive */
 789                                 offset += comment_length;
 790                                 datasize -= comment_length;
 791                         }
 792                         break;
 793                 }
 794                 case 0x7075:
 795                 {
 796                         /* Info-ZIP Unicode Path Extra Field. */
 797                         if (datasize < 5 || entry == NULL)
 798                                 break;
 799                         offset += 5;
 800                         datasize -= 5;
 801
 802                         /* The path name in this field is always encoded
 803                          * in UTF-8. */
 804                         if (zip->sconv_utf8 == NULL) {
 805                                 zip->sconv_utf8 =
 806                                         archive_string_conversion_from_charset(
 807                                         &a->archive, "UTF-8", 1);
 808                                 /* If the converter from UTF-8 is not
 809                                  * available, then the path name from the main
 810                                  * field will more likely be correct. */
 811                                 if (zip->sconv_utf8 == NULL)
 812                                         break;
 813                         }
 814
 815                         /* Make sure the CRC32 of the filename matches. */
 816                         if (!zip->ignore_crc32) {
 817                                 const char *cp = archive_entry_pathname(entry);
 818                                 if (cp) {
 819                                         unsigned long file_crc =
 820                                             zip->crc32func(0, cp, strlen(cp));
 821                                         unsigned long utf_crc =
 822                                             archive_le32dec(p + offset - 4);
 823                                         if (file_crc != utf_crc) {
 824 #ifdef DEBUG
 825                                                 fprintf(stderr,
 826                                                     "CRC filename mismatch; "
 827                                                     "CDE is %lx, but UTF8 "
 828                                                     "is outdated with %lx\n",
 829                                                     file_crc, utf_crc);
 830 #endif
 831                                                 break;
 832                                         }
 833                                 }
 834                         }
 835
 836                         if (archive_entry_copy_pathname_l(entry,
 837                             p + offset, datasize, zip->sconv_utf8) != 0) {
 838                                 /* Ignore the error, and fallback to the path
 839                                  * name from the main field. */
 840 #ifdef DEBUG
 841                                 fprintf(stderr, "Failed to read the ZIP "
 842                                     "0x7075 extra field path.\n");
 843 #endif
 844                         }
 845                         break;
 846                 }
 847                 case 0x7855:
 848                         /* Info-ZIP Unix Extra Field (type 2) "Ux". */
 849 #ifdef DEBUG
 850                         fprintf(stderr, "uid %d gid %d\n",
 851                             archive_le16dec(p + offset),
 852                             archive_le16dec(p + offset + 2));
 853 #endif
 854                         if (datasize >= 2)
 855                                 zip_entry->uid = archive_le16dec(p + offset);
 856                         if (datasize >= 4)
 857                                 zip_entry->gid =
 858                                     archive_le16dec(p + offset + 2);
 859                         break;
 860                 case 0x7875:
 861                 {
 862                         /* Info-Zip Unix Extra Field (type 3) "ux". */
 863                         int uidsize = 0, gidsize = 0;
 864
 865                         /* TODO: support arbitrary uidsize/gidsize. */
 866                         if (datasize >= 1 && p[offset] == 1) {/* version=1 */
 867                                 if (datasize >= 4) {
 868                                         /* get a uid size. */
 869                                         uidsize = 0xff & (int)p[offset+1];
 870                                         if (uidsize == 2)
 871                                                 zip_entry->uid =
 872                                                     archive_le16dec(
 873                                                         p + offset + 2);
 874                                         else if (uidsize == 4 && datasize >= 6)
 875                                                 zip_entry->uid =
 876                                                     archive_le32dec(
 877                                                         p + offset + 2);
 878                                 }
 879                                 if (datasize >= (2 + uidsize + 3)) {
 880                                         /* get a gid size. */
 881                                         gidsize = 0xff &
 882                                             (int)p[offset+2+uidsize];
 883                                         if (gidsize == 2)
 884                                                 zip_entry->gid =
 885                                                     archive_le16dec(
 886                                                         p+offset+2+uidsize+1);
 887                                         else if (gidsize == 4 &&
 888                                             datasize >= (2 + uidsize + 5))
 889                                                 zip_entry->gid =
 890                                                     archive_le32dec(
 891                                                         p+offset+2+uidsize+1);
 892                                 }
 893                         }
 894                         break;
 895                 }
 896                 case 0x9901:
 897                         /* WinZip AES extra data field. */
 898                         if (datasize < 6) {
 899                                 archive_set_error(&a->archive,
 900                                     ARCHIVE_ERRNO_FILE_FORMAT,
 901                                     "Incomplete AES field");
 902                                 return ARCHIVE_FAILED;
 903                         }
 904                         if (p[offset + 2] == 'A' && p[offset + 3] == 'E') {
 905                                 /* Vendor version. */
 906                                 zip_entry->aes_extra.vendor =
 907                                     archive_le16dec(p + offset);
 908                                 /* AES encryption strength. */
 909                                 zip_entry->aes_extra.strength = p[offset + 4];
 910                                 /* Actual compression method. */
 911                                 zip_entry->aes_extra.compression =
 912                                     p[offset + 5];
 913                         }
 914                         break;
 915                 default:
 916                         break;
 917                 }
 918                 offset += datasize;
 919         }
 920         return ARCHIVE_OK;
 921 }
 922
 923 /*
 924  * Assumes file pointer is at beginning of local file header.
 925  */
 926 static int
 927 zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry,
 928     struct zip *zip)
 929 {
 930         const char *p;
 931         const void *h;
 932         const wchar_t *wp;
 933         const char *cp;
 934         size_t len, filename_length, extra_length;
 935         struct archive_string_conv *sconv;
 936         struct zip_entry *zip_entry = zip->entry;
 937         struct zip_entry zip_entry_central_dir;
 938         int ret = ARCHIVE_OK;
 939         char version;
 940
 941         /* Save a copy of the original for consistency checks. */
 942         zip_entry_central_dir = *zip_entry;
 943
 944         zip->decompress_init = 0;
 945         zip->end_of_entry = 0;
 946         zip->entry_uncompressed_bytes_read = 0;
 947         zip->entry_compressed_bytes_read = 0;
 948         zip->entry_crc32 = zip->crc32func(0, NULL, 0);
 949
 950         /* Setup default conversion. */
 951         if (zip->sconv == NULL && !zip->init_default_conversion) {
 952                 zip->sconv_default =
 953                     archive_string_default_conversion_for_read(&(a->archive));
 954                 zip->init_default_conversion = 1;
 955         }
 956
 957         if ((p = __archive_read_ahead(a, 30, NULL)) == NULL) {
 958                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 959                     "Truncated ZIP file header");
 960                 return (ARCHIVE_FATAL);
 961         }
 962
 963         if (memcmp(p, "PK\003\004", 4) != 0) {
 964                 archive_set_error(&a->archive, -1, "Damaged Zip archive");
 965                 return ARCHIVE_FATAL;
 966         }
 967         version = p[4];
 968         zip_entry->system = p[5];
 969         zip_entry->zip_flags = archive_le16dec(p + 6);
 970         if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) {
 971                 zip->has_encrypted_entries = 1;
 972                 archive_entry_set_is_data_encrypted(entry, 1);
 973                 if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED &&
 974                         zip_entry->zip_flags & ZIP_ENCRYPTED &&
 975                         zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) {
 976                         archive_entry_set_is_metadata_encrypted(entry, 1);
 977                         return ARCHIVE_FATAL;
 978                 }
 979         }
 980         zip->init_decryption = (zip_entry->zip_flags & ZIP_ENCRYPTED);
 981         zip_entry->compression = (char)archive_le16dec(p + 8);
 982         zip_entry->mtime = zip_time(p + 10);
 983         zip_entry->crc32 = archive_le32dec(p + 14);
 984         if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
 985                 zip_entry->decdat = p[11];
 986         else
 987                 zip_entry->decdat = p[17];
 988         zip_entry->compressed_size = archive_le32dec(p + 18);
 989         zip_entry->uncompressed_size = archive_le32dec(p + 22);
 990         filename_length = archive_le16dec(p + 26);
 991         extra_length = archive_le16dec(p + 28);
 992
 993         __archive_read_consume(a, 30);
 994
 995         /* Read the filename. */
 996         if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) {
 997                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 998                     "Truncated ZIP file header");
 999                 return (ARCHIVE_FATAL);
1000         }
1001         if (zip_entry->zip_flags & ZIP_UTF8_NAME) {
1002                 /* The filename is stored to be UTF-8. */
1003                 if (zip->sconv_utf8 == NULL) {
1004                         zip->sconv_utf8 =
1005                             archive_string_conversion_from_charset(
1006                                 &a->archive, "UTF-8", 1);
1007                         if (zip->sconv_utf8 == NULL)
1008                                 return (ARCHIVE_FATAL);
1009                 }
1010                 sconv = zip->sconv_utf8;
1011         } else if (zip->sconv != NULL)
1012                 sconv = zip->sconv;
1013         else
1014                 sconv = zip->sconv_default;
1015
1016         if (archive_entry_copy_pathname_l(entry,
1017             h, filename_length, sconv) != 0) {
1018                 if (errno == ENOMEM) {
1019                         archive_set_error(&a->archive, ENOMEM,
1020                             "Can't allocate memory for Pathname");
1021                         return (ARCHIVE_FATAL);
1022                 }
1023                 archive_set_error(&a->archive,
1024                     ARCHIVE_ERRNO_FILE_FORMAT,
1025                     "Pathname cannot be converted "
1026                     "from %s to current locale.",
1027                     archive_string_conversion_charset_name(sconv));
1028                 ret = ARCHIVE_WARN;
1029         }
1030         __archive_read_consume(a, filename_length);
1031
1032         /* Read the extra data. */
1033         if ((h = __archive_read_ahead(a, extra_length, NULL)) == NULL) {
1034                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1035                     "Truncated ZIP file header");
1036                 return (ARCHIVE_FATAL);
1037         }
1038
1039         if (ARCHIVE_OK != process_extra(a, entry, h, extra_length,
1040             zip_entry)) {
1041                 return ARCHIVE_FATAL;
1042         }
1043         __archive_read_consume(a, extra_length);
1044
1045         /* Work around a bug in Info-Zip: When reading from a pipe, it
1046          * stats the pipe instead of synthesizing a file entry. */
1047         if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) {
1048                 zip_entry->mode &= ~ AE_IFMT;
1049                 zip_entry->mode |= AE_IFREG;
1050         }
1051
1052         /* If the mode is totally empty, set some sane default. */
1053         if (zip_entry->mode == 0) {
1054                 zip_entry->mode |= 0664;
1055         }
1056
1057         /* Windows archivers sometimes use backslash as the directory
1058          * separator. Normalize to slash. */
1059         if (zip_entry->system == 0 &&
1060             (wp = archive_entry_pathname_w(entry)) != NULL) {
1061                 if (wcschr(wp, L'/') == NULL && wcschr(wp, L'\\') != NULL) {
1062                         size_t i;
1063                         struct archive_wstring s;
1064                         archive_string_init(&s);
1065                         archive_wstrcpy(&s, wp);
1066                         for (i = 0; i < archive_strlen(&s); i++) {
1067                                 if (s.s[i] == '\\')
1068                                         s.s[i] = '/';
1069                         }
1070                         archive_entry_copy_pathname_w(entry, s.s);
1071                         archive_wstring_free(&s);
1072                 }
1073         }
1074
1075         /* Make sure that entries with a trailing '/' are marked as directories
1076          * even if the External File Attributes contains bogus values.  If this
1077          * is not a directory and there is no type, assume a regular file. */
1078         if ((zip_entry->mode & AE_IFMT) != AE_IFDIR) {
1079                 int has_slash;
1080
1081                 wp = archive_entry_pathname_w(entry);
1082                 if (wp != NULL) {
1083                         len = wcslen(wp);
1084                         has_slash = len > 0 && wp[len - 1] == L'/';
1085                 } else {
1086                         cp = archive_entry_pathname(entry);
1087                         len = (cp != NULL)?strlen(cp):0;
1088                         has_slash = len > 0 && cp[len - 1] == '/';
1089                 }
1090                 /* Correct file type as needed. */
1091                 if (has_slash) {
1092                         zip_entry->mode &= ~AE_IFMT;
1093                         zip_entry->mode |= AE_IFDIR;
1094                         zip_entry->mode |= 0111;
1095                 } else if ((zip_entry->mode & AE_IFMT) == 0) {
1096                         zip_entry->mode |= AE_IFREG;
1097                 }
1098         }
1099
1100         /* Make sure directories end in '/' */
1101         if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) {
1102                 wp = archive_entry_pathname_w(entry);
1103                 if (wp != NULL) {
1104                         len = wcslen(wp);
1105                         if (len > 0 && wp[len - 1] != L'/') {
1106                                 struct archive_wstring s;
1107                                 archive_string_init(&s);
1108                                 archive_wstrcat(&s, wp);
1109                                 archive_wstrappend_wchar(&s, L'/');
1110                                 archive_entry_copy_pathname_w(entry, s.s);
1111                                 archive_wstring_free(&s);
1112                         }
1113                 } else {
1114                         cp = archive_entry_pathname(entry);
1115                         len = (cp != NULL)?strlen(cp):0;
1116                         if (len > 0 && cp[len - 1] != '/') {
1117                                 struct archive_string s;
1118                                 archive_string_init(&s);
1119                                 archive_strcat(&s, cp);
1120                                 archive_strappend_char(&s, '/');
1121                                 archive_entry_set_pathname(entry, s.s);
1122                                 archive_string_free(&s);
1123                         }
1124                 }
1125         }
1126
1127         if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) {
1128                 /* If this came from the central dir, its size info
1129                  * is definitive, so ignore the length-at-end flag. */
1130                 zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END;
1131                 /* If local header is missing a value, use the one from
1132                    the central directory.  If both have it, warn about
1133                    mismatches. */
1134                 if (zip_entry->crc32 == 0) {
1135                         zip_entry->crc32 = zip_entry_central_dir.crc32;
1136                 } else if (!zip->ignore_crc32
1137                     && zip_entry->crc32 != zip_entry_central_dir.crc32) {
1138                         archive_set_error(&a->archive,
1139                             ARCHIVE_ERRNO_FILE_FORMAT,
1140                             "Inconsistent CRC32 values");
1141                         ret = ARCHIVE_WARN;
1142                 }
1143                 if (zip_entry->compressed_size == 0) {
1144                         zip_entry->compressed_size
1145                             = zip_entry_central_dir.compressed_size;
1146                 } else if (zip_entry->compressed_size
1147                     != zip_entry_central_dir.compressed_size) {
1148                         archive_set_error(&a->archive,
1149                             ARCHIVE_ERRNO_FILE_FORMAT,
1150                             "Inconsistent compressed size: "
1151                             "%jd in central directory, %jd in local header",
1152                             (intmax_t)zip_entry_central_dir.compressed_size,
1153                             (intmax_t)zip_entry->compressed_size);
1154                         ret = ARCHIVE_WARN;
1155                 }
1156                 if (zip_entry->uncompressed_size == 0 ||
1157                         zip_entry->uncompressed_size == 0xffffffff) {
1158                         zip_entry->uncompressed_size
1159                             = zip_entry_central_dir.uncompressed_size;
1160                 } else if (zip_entry->uncompressed_size
1161                     != zip_entry_central_dir.uncompressed_size) {
1162                         archive_set_error(&a->archive,
1163                             ARCHIVE_ERRNO_FILE_FORMAT,
1164                             "Inconsistent uncompressed size: "
1165                             "%jd in central directory, %jd in local header",
1166                             (intmax_t)zip_entry_central_dir.uncompressed_size,
1167                             (intmax_t)zip_entry->uncompressed_size);
1168                         ret = ARCHIVE_WARN;
1169                 }
1170         }
1171
1172         /* Populate some additional entry fields: */
1173         archive_entry_set_mode(entry, zip_entry->mode);
1174         archive_entry_set_uid(entry, zip_entry->uid);
1175         archive_entry_set_gid(entry, zip_entry->gid);
1176         archive_entry_set_mtime(entry, zip_entry->mtime, 0);
1177         archive_entry_set_ctime(entry, zip_entry->ctime, 0);
1178         archive_entry_set_atime(entry, zip_entry->atime, 0);
1179
1180         if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) {
1181                 size_t linkname_length;
1182
1183                 if (zip_entry->compressed_size > 64 * 1024) {
1184                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1185                             "Zip file with oversized link entry");
1186                         return ARCHIVE_FATAL;
1187                 }
1188
1189                 linkname_length = (size_t)zip_entry->compressed_size;
1190
1191                 archive_entry_set_size(entry, 0);
1192
1193                 // take into account link compression if any
1194                 size_t linkname_full_length = linkname_length;
1195                 if (zip->entry->compression != 0)
1196                 {
1197                         // symlink target string appeared to be compressed
1198                         int status = ARCHIVE_FATAL;
1199                         const void *uncompressed_buffer = NULL;
1200
1201                         switch (zip->entry->compression)
1202                         {
1203 #if HAVE_ZLIB_H
1204                                 case 8: /* Deflate compression. */
1205                                         zip->entry_bytes_remaining = zip_entry->compressed_size;
1206                                         status = zip_read_data_deflate(a, &uncompressed_buffer,
1207                                                 &linkname_full_length, NULL);
1208                                         break;
1209 #endif
1210 #if HAVE_LZMA_H && HAVE_LIBLZMA
1211                                 case 14: /* ZIPx LZMA compression. */
1212                                         /*(see zip file format specification, section 4.4.5)*/
1213                                         zip->entry_bytes_remaining = zip_entry->compressed_size;
1214                                         status = zip_read_data_zipx_lzma_alone(a, &uncompressed_buffer,
1215                                                 &linkname_full_length, NULL);
1216                                         break;
1217 #endif
1218                                 default: /* Unsupported compression. */
1219                                         break;
1220                         }
1221                         if (status == ARCHIVE_OK)
1222                         {
1223                                 p = uncompressed_buffer;
1224                         }
1225                         else
1226                         {
1227                                 archive_set_error(&a->archive,
1228                                         ARCHIVE_ERRNO_FILE_FORMAT,
1229                                         "Unsupported ZIP compression method "
1230                                         "during decompression of link entry (%d: %s)",
1231                                         zip->entry->compression,
1232                                         compression_name(zip->entry->compression));
1233                                 return ARCHIVE_FAILED;
1234                         }
1235                 }
1236                 else
1237                 {
1238                         p = __archive_read_ahead(a, linkname_length, NULL);
1239                 }
1240
1241                 if (p == NULL) {
1242                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1243                             "Truncated Zip file");
1244                         return ARCHIVE_FATAL;
1245                 }
1246
1247                 sconv = zip->sconv;
1248                 if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME))
1249                         sconv = zip->sconv_utf8;
1250                 if (sconv == NULL)
1251                         sconv = zip->sconv_default;
1252                 if (archive_entry_copy_symlink_l(entry, p, linkname_full_length,
1253                     sconv) != 0) {
1254                         if (errno != ENOMEM && sconv == zip->sconv_utf8 &&
1255                             (zip->entry->zip_flags & ZIP_UTF8_NAME))
1256                             archive_entry_copy_symlink_l(entry, p,
1257                                 linkname_full_length, NULL);
1258                         if (errno == ENOMEM) {
1259                                 archive_set_error(&a->archive, ENOMEM,
1260                                     "Can't allocate memory for Symlink");
1261                                 return (ARCHIVE_FATAL);
1262                         }
1263                         /*
1264                          * Since there is no character-set regulation for
1265                          * symlink name, do not report the conversion error
1266                          * in an automatic conversion.
1267                          */
1268                         if (sconv != zip->sconv_utf8 ||
1269                             (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) {
1270                                 archive_set_error(&a->archive,
1271                                     ARCHIVE_ERRNO_FILE_FORMAT,
1272                                     "Symlink cannot be converted "
1273                                     "from %s to current locale.",
1274                                     archive_string_conversion_charset_name(
1275                                         sconv));
1276                                 ret = ARCHIVE_WARN;
1277                         }
1278                 }
1279                 zip_entry->uncompressed_size = zip_entry->compressed_size = 0;
1280
1281                 if (__archive_read_consume(a, linkname_length) < 0) {
1282                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1283                             "Read error skipping symlink target name");
1284                         return ARCHIVE_FATAL;
1285                 }
1286         } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1287             || zip_entry->uncompressed_size > 0) {
1288                 /* Set the size only if it's meaningful. */
1289                 archive_entry_set_size(entry, zip_entry->uncompressed_size);
1290         }
1291         zip->entry_bytes_remaining = zip_entry->compressed_size;
1292
1293         /* If there's no body, force read_data() to return EOF immediately. */
1294         if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1295             && zip->entry_bytes_remaining < 1)
1296                 zip->end_of_entry = 1;
1297
1298         /* Set up a more descriptive format name. */
1299         archive_string_empty(&zip->format_name);
1300         archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)",
1301             version / 10, version % 10,
1302             compression_name(zip->entry->compression));
1303         a->archive.archive_format_name = zip->format_name.s;
1304
1305         return (ret);
1306 }
1307
1308 static int
1309 check_authentication_code(struct archive_read *a, const void *_p)
1310 {
1311         struct zip *zip = (struct zip *)(a->format->data);
1312
1313         /* Check authentication code. */
1314         if (zip->hctx_valid) {
1315                 const void *p;
1316                 uint8_t hmac[20];
1317                 size_t hmac_len = 20;
1318                 int cmp;
1319
1320                 archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len);
1321                 if (_p == NULL) {
1322                         /* Read authentication code. */
1323                         p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL);
1324                         if (p == NULL) {
1325                                 archive_set_error(&a->archive,
1326                                     ARCHIVE_ERRNO_FILE_FORMAT,
1327                                     "Truncated ZIP file data");
1328                                 return (ARCHIVE_FATAL);
1329                         }
1330                 } else {
1331                         p = _p;
1332                 }
1333                 cmp = memcmp(hmac, p, AUTH_CODE_SIZE);
1334                 __archive_read_consume(a, AUTH_CODE_SIZE);
1335                 if (cmp != 0) {
1336                         archive_set_error(&a->archive,
1337                             ARCHIVE_ERRNO_MISC,
1338                             "ZIP bad Authentication code");
1339                         return (ARCHIVE_WARN);
1340                 }
1341         }
1342         return (ARCHIVE_OK);
1343 }
1344
1345 /*
1346  * Read "uncompressed" data.  There are three cases:
1347  *  1) We know the size of the data.  This is always true for the
1348  * seeking reader (we've examined the Central Directory already).
1349  *  2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred.
1350  * Info-ZIP seems to do this; we know the size but have to grab
1351  * the CRC from the data descriptor afterwards.
1352  *  3) We're streaming and ZIP_LENGTH_AT_END was specified and
1353  * we have no size information.  In this case, we can do pretty
1354  * well by watching for the data descriptor record.  The data
1355  * descriptor is 16 bytes and includes a computed CRC that should
1356  * provide a strong check.
1357  *
1358  * TODO: Technically, the PK\007\010 signature is optional.
1359  * In the original spec, the data descriptor contained CRC
1360  * and size fields but had no leading signature.  In practice,
1361  * newer writers seem to provide the signature pretty consistently.
1362  *
1363  * For uncompressed data, the PK\007\010 marker seems essential
1364  * to be sure we've actually seen the end of the entry.
1365  *
1366  * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets
1367  * zip->end_of_entry if it consumes all of the data.
1368  */
1369 static int
1370 zip_read_data_none(struct archive_read *a, const void **_buff,
1371     size_t *size, int64_t *offset)
1372 {
1373         struct zip *zip;
1374         const char *buff;
1375         ssize_t bytes_avail;
1376         int r;
1377
1378         (void)offset; /* UNUSED */
1379
1380         zip = (struct zip *)(a->format->data);
1381
1382         if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) {
1383                 const char *p;
1384                 ssize_t grabbing_bytes = 24;
1385
1386                 if (zip->hctx_valid)
1387                         grabbing_bytes += AUTH_CODE_SIZE;
1388                 /* Grab at least 24 bytes. */
1389                 buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail);
1390                 if (bytes_avail < grabbing_bytes) {
1391                         /* Zip archives have end-of-archive markers
1392                            that are longer than this, so a failure to get at
1393                            least 24 bytes really does indicate a truncated
1394                            file. */
1395                         archive_set_error(&a->archive,
1396                             ARCHIVE_ERRNO_FILE_FORMAT,
1397                             "Truncated ZIP file data");
1398                         return (ARCHIVE_FATAL);
1399                 }
1400                 /* Check for a complete PK\007\010 signature, followed
1401                  * by the correct 4-byte CRC. */
1402                 p = buff;
1403                 if (zip->hctx_valid)
1404                         p += AUTH_CODE_SIZE;
1405                 if (p[0] == 'P' && p[1] == 'K'
1406                     && p[2] == '\007' && p[3] == '\010'
1407                     && (archive_le32dec(p + 4) == zip->entry_crc32
1408                         || zip->ignore_crc32
1409                         || (zip->hctx_valid
1410                          && zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) {
1411                         if (zip->entry->flags & LA_USED_ZIP64) {
1412                                 uint64_t compressed, uncompressed;
1413                                 zip->entry->crc32 = archive_le32dec(p + 4);
1414                                 compressed = archive_le64dec(p + 8);
1415                                 uncompressed = archive_le64dec(p + 16);
1416                                 if (compressed > INT64_MAX || uncompressed >
1417                                     INT64_MAX) {
1418                                         archive_set_error(&a->archive,
1419                                             ARCHIVE_ERRNO_FILE_FORMAT,
1420                                             "Overflow of 64-bit file sizes");
1421                                         return ARCHIVE_FAILED;
1422                                 }
1423                                 zip->entry->compressed_size = compressed;
1424                                 zip->entry->uncompressed_size = uncompressed;
1425                                 zip->unconsumed = 24;
1426                         } else {
1427                                 zip->entry->crc32 = archive_le32dec(p + 4);
1428                                 zip->entry->compressed_size =
1429                                         archive_le32dec(p + 8);
1430                                 zip->entry->uncompressed_size =
1431                                         archive_le32dec(p + 12);
1432                                 zip->unconsumed = 16;
1433                         }
1434                         if (zip->hctx_valid) {
1435                                 r = check_authentication_code(a, buff);
1436                                 if (r != ARCHIVE_OK)
1437                                         return (r);
1438                         }
1439                         zip->end_of_entry = 1;
1440                         return (ARCHIVE_OK);
1441                 }
1442                 /* If not at EOF, ensure we consume at least one byte. */
1443                 ++p;
1444
1445                 /* Scan forward until we see where a PK\007\010 signature
1446                  * might be. */
1447                 /* Return bytes up until that point.  On the next call,
1448                  * the code above will verify the data descriptor. */
1449                 while (p < buff + bytes_avail - 4) {
1450                         if (p[3] == 'P') { p += 3; }
1451                         else if (p[3] == 'K') { p += 2; }
1452                         else if (p[3] == '\007') { p += 1; }
1453                         else if (p[3] == '\010' && p[2] == '\007'
1454                             && p[1] == 'K' && p[0] == 'P') {
1455                                 if (zip->hctx_valid)
1456                                         p -= AUTH_CODE_SIZE;
1457                                 break;
1458                         } else { p += 4; }
1459                 }
1460                 bytes_avail = p - buff;
1461         } else {
1462                 if (zip->entry_bytes_remaining == 0) {
1463                         zip->end_of_entry = 1;
1464                         if (zip->hctx_valid) {
1465                                 r = check_authentication_code(a, NULL);
1466                                 if (r != ARCHIVE_OK)
1467                                         return (r);
1468                         }
1469                         return (ARCHIVE_OK);
1470                 }
1471                 /* Grab a bunch of bytes. */
1472                 buff = __archive_read_ahead(a, 1, &bytes_avail);
1473                 if (bytes_avail <= 0) {
1474                         archive_set_error(&a->archive,
1475                             ARCHIVE_ERRNO_FILE_FORMAT,
1476                             "Truncated ZIP file data");
1477                         return (ARCHIVE_FATAL);
1478                 }
1479                 if (bytes_avail > zip->entry_bytes_remaining)
1480                         bytes_avail = (ssize_t)zip->entry_bytes_remaining;
1481         }
1482         if (zip->tctx_valid || zip->cctx_valid) {
1483                 size_t dec_size = bytes_avail;
1484
1485                 if (dec_size > zip->decrypted_buffer_size)
1486                         dec_size = zip->decrypted_buffer_size;
1487                 if (zip->tctx_valid) {
1488                         trad_enc_decrypt_update(&zip->tctx,
1489                             (const uint8_t *)buff, dec_size,
1490                             zip->decrypted_buffer, dec_size);
1491                 } else {
1492                         size_t dsize = dec_size;
1493                         archive_hmac_sha1_update(&zip->hctx,
1494                             (const uint8_t *)buff, dec_size);
1495                         archive_decrypto_aes_ctr_update(&zip->cctx,
1496                             (const uint8_t *)buff, dec_size,
1497                             zip->decrypted_buffer, &dsize);
1498                 }
1499                 bytes_avail = dec_size;
1500                 buff = (const char *)zip->decrypted_buffer;
1501         }
1502         *size = bytes_avail;
1503         zip->entry_bytes_remaining -= bytes_avail;
1504         zip->entry_uncompressed_bytes_read += bytes_avail;
1505         zip->entry_compressed_bytes_read += bytes_avail;
1506         zip->unconsumed += bytes_avail;
1507         *_buff = buff;
1508         return (ARCHIVE_OK);
1509 }
1510
1511 static int
1512 consume_optional_marker(struct archive_read *a, struct zip *zip)
1513 {
1514         if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
1515                 const char *p;
1516
1517                 if (NULL == (p = __archive_read_ahead(a, 24, NULL))) {
1518                         archive_set_error(&a->archive,
1519                             ARCHIVE_ERRNO_FILE_FORMAT,
1520                             "Truncated ZIP end-of-file record");
1521                         return (ARCHIVE_FATAL);
1522                 }
1523                 /* Consume the optional PK\007\010 marker. */
1524                 if (p[0] == 'P' && p[1] == 'K' &&
1525                     p[2] == '\007' && p[3] == '\010') {
1526                         p += 4;
1527                         zip->unconsumed = 4;
1528                 }
1529                 if (zip->entry->flags & LA_USED_ZIP64) {
1530                         uint64_t compressed, uncompressed;
1531                         zip->entry->crc32 = archive_le32dec(p);
1532                         compressed = archive_le64dec(p + 4);
1533                         uncompressed = archive_le64dec(p + 12);
1534                         if (compressed > INT64_MAX ||
1535                             uncompressed > INT64_MAX) {
1536                                 archive_set_error(&a->archive,
1537                                     ARCHIVE_ERRNO_FILE_FORMAT,
1538                                     "Overflow of 64-bit file sizes");
1539                                 return ARCHIVE_FAILED;
1540                         }
1541                         zip->entry->compressed_size = compressed;
1542                         zip->entry->uncompressed_size = uncompressed;
1543                         zip->unconsumed += 20;
1544                 } else {
1545                         zip->entry->crc32 = archive_le32dec(p);
1546                         zip->entry->compressed_size = archive_le32dec(p + 4);
1547                         zip->entry->uncompressed_size = archive_le32dec(p + 8);
1548                         zip->unconsumed += 12;
1549                 }
1550         }
1551
1552     return (ARCHIVE_OK);
1553 }
1554
1555 #if HAVE_LZMA_H && HAVE_LIBLZMA
1556 static int
1557 zipx_xz_init(struct archive_read *a, struct zip *zip)
1558 {
1559         lzma_ret r;
1560
1561         if(zip->zipx_lzma_valid) {
1562                 lzma_end(&zip->zipx_lzma_stream);
1563                 zip->zipx_lzma_valid = 0;
1564         }
1565
1566         memset(&zip->zipx_lzma_stream, 0, sizeof(zip->zipx_lzma_stream));
1567         r = lzma_stream_decoder(&zip->zipx_lzma_stream, UINT64_MAX, 0);
1568         if (r != LZMA_OK) {
1569                 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC,
1570                     "xz initialization failed(%d)",
1571                     r);
1572
1573                 return (ARCHIVE_FAILED);
1574         }
1575
1576         zip->zipx_lzma_valid = 1;
1577
1578         free(zip->uncompressed_buffer);
1579
1580         zip->uncompressed_buffer_size = 256 * 1024;
1581         zip->uncompressed_buffer =
1582             (uint8_t*) malloc(zip->uncompressed_buffer_size);
1583         if (zip->uncompressed_buffer == NULL) {
1584                 archive_set_error(&a->archive, ENOMEM,
1585                     "No memory for xz decompression");
1586                     return (ARCHIVE_FATAL);
1587         }
1588
1589         zip->decompress_init = 1;
1590         return (ARCHIVE_OK);
1591 }
1592
1593 static int
1594 zipx_lzma_alone_init(struct archive_read *a, struct zip *zip)
1595 {
1596         lzma_ret r;
1597         const uint8_t* p;
1598
1599 #pragma pack(push)
1600 #pragma pack(1)
1601         struct _alone_header {
1602             uint8_t bytes[5];
1603             uint64_t uncompressed_size;
1604         } alone_header;
1605 #pragma pack(pop)
1606
1607         if(zip->zipx_lzma_valid) {
1608                 lzma_end(&zip->zipx_lzma_stream);
1609                 zip->zipx_lzma_valid = 0;
1610         }
1611
1612         /* To unpack ZIPX's "LZMA" (id 14) stream we can use standard liblzma
1613          * that is a part of XZ Utils. The stream format stored inside ZIPX
1614          * file is a modified "lzma alone" file format, that was used by the
1615          * `lzma` utility which was later deprecated in favour of `xz` utility.
1616          * Since those formats are nearly the same, we can use a standard
1617          * "lzma alone" decoder from XZ Utils. */
1618
1619         memset(&zip->zipx_lzma_stream, 0, sizeof(zip->zipx_lzma_stream));
1620         r = lzma_alone_decoder(&zip->zipx_lzma_stream, UINT64_MAX);
1621         if (r != LZMA_OK) {
1622                 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC,
1623                     "lzma initialization failed(%d)", r);
1624
1625                 return (ARCHIVE_FAILED);
1626         }
1627
1628         /* Flag the cleanup function that we want our lzma-related structures
1629          * to be freed later. */
1630         zip->zipx_lzma_valid = 1;
1631
1632         /* The "lzma alone" file format and the stream format inside ZIPx are
1633          * almost the same. Here's an example of a structure of "lzma alone"
1634          * format:
1635          *
1636          * $ cat /bin/ls | lzma | xxd | head -n 1
1637          * 00000000: 5d00 0080 00ff ffff ffff ffff ff00 2814
1638          *
1639          *    5 bytes        8 bytes        n bytes
1640          * <lzma_params><uncompressed_size><data...>
1641          *
1642          * lzma_params is a 5-byte blob that has to be decoded to extract
1643          * parameters of this LZMA stream. The uncompressed_size field is an
1644          * uint64_t value that contains information about the size of the
1645          * uncompressed file, or UINT64_MAX if this value is unknown.
1646          * The <data...> part is the actual lzma-compressed data stream.
1647          *
1648          * Now here's the structure of the stream inside the ZIPX file:
1649          *
1650          * $ cat stream_inside_zipx | xxd | head -n 1
1651          * 00000000: 0914 0500 5d00 8000 0000 2814 .... ....
1652          *
1653          *  2byte   2byte    5 bytes     n bytes
1654          * <magic1><magic2><lzma_params><data...>
1655          *
1656          * This means that the ZIPX file contains an additional magic1 and
1657          * magic2 headers, the lzma_params field contains the same parameter
1658          * set as in the "lzma alone" format, and the <data...> field is the
1659          * same as in the "lzma alone" format as well. Note that also the zipx
1660          * format is missing the uncompressed_size field.
1661          *
1662          * So, in order to use the "lzma alone" decoder for the zipx lzma
1663          * stream, we simply need to shuffle around some fields, prepare a new
1664          * lzma alone header, feed it into lzma alone decoder so it will
1665          * initialize itself properly, and then we can start feeding normal
1666          * zipx lzma stream into the decoder.
1667          */
1668
1669         /* Read magic1,magic2,lzma_params from the ZIPX stream. */
1670         if(zip->entry_bytes_remaining < 9 || (p = __archive_read_ahead(a, 9, NULL)) == NULL) {
1671                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1672                     "Truncated lzma data");
1673                 return (ARCHIVE_FATAL);
1674         }
1675
1676         if(p[2] != 0x05 || p[3] != 0x00) {
1677                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1678                     "Invalid lzma data");
1679                 return (ARCHIVE_FATAL);
1680         }
1681
1682         /* Prepare an lzma alone header: copy the lzma_params blob into
1683          * a proper place into the lzma alone header. */
1684         memcpy(&alone_header.bytes[0], p + 4, 5);
1685
1686         /* Initialize the 'uncompressed size' field to unknown; we'll manually
1687          * monitor how many bytes there are still to be uncompressed. */
1688         alone_header.uncompressed_size = UINT64_MAX;
1689
1690         if(!zip->uncompressed_buffer) {
1691                 zip->uncompressed_buffer_size = 256 * 1024;
1692                 zip->uncompressed_buffer =
1693                         (uint8_t*) malloc(zip->uncompressed_buffer_size);
1694
1695                 if (zip->uncompressed_buffer == NULL) {
1696                         archive_set_error(&a->archive, ENOMEM,
1697                             "No memory for lzma decompression");
1698                         return (ARCHIVE_FATAL);
1699                 }
1700         }
1701
1702         zip->zipx_lzma_stream.next_in = (void*) &alone_header;
1703         zip->zipx_lzma_stream.avail_in = sizeof(alone_header);
1704         zip->zipx_lzma_stream.total_in = 0;
1705         zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer;
1706         zip->zipx_lzma_stream.avail_out = zip->uncompressed_buffer_size;
1707         zip->zipx_lzma_stream.total_out = 0;
1708
1709         /* Feed only the header into the lzma alone decoder. This will
1710          * effectively initialize the decoder, and will not produce any
1711          * output bytes yet. */
1712         r = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN);
1713         if (r != LZMA_OK) {
1714                 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
1715                     "lzma stream initialization error");
1716                 return ARCHIVE_FATAL;
1717         }
1718
1719         /* We've already consumed some bytes, so take this into account. */
1720         __archive_read_consume(a, 9);
1721         zip->entry_bytes_remaining -= 9;
1722         zip->entry_compressed_bytes_read += 9;
1723
1724         zip->decompress_init = 1;
1725         return (ARCHIVE_OK);
1726 }
1727
1728 static int
1729 zip_read_data_zipx_xz(struct archive_read *a, const void **buff,
1730         size_t *size, int64_t *offset)
1731 {
1732         struct zip* zip = (struct zip *)(a->format->data);
1733         int ret;
1734         lzma_ret lz_ret;
1735         const void* compressed_buf;
1736         ssize_t bytes_avail, in_bytes, to_consume = 0;
1737
1738         (void) offset; /* UNUSED */
1739
1740         /* Initialize decompressor if not yet initialized. */
1741         if (!zip->decompress_init) {
1742                 ret = zipx_xz_init(a, zip);
1743                 if (ret != ARCHIVE_OK)
1744                         return (ret);
1745         }
1746
1747         compressed_buf = __archive_read_ahead(a, 1, &bytes_avail);
1748         if (bytes_avail < 0) {
1749                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1750                     "Truncated xz file body");
1751                 return (ARCHIVE_FATAL);
1752         }
1753
1754         in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail);
1755         zip->zipx_lzma_stream.next_in = compressed_buf;
1756         zip->zipx_lzma_stream.avail_in = in_bytes;
1757         zip->zipx_lzma_stream.total_in = 0;
1758         zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer;
1759         zip->zipx_lzma_stream.avail_out = zip->uncompressed_buffer_size;
1760         zip->zipx_lzma_stream.total_out = 0;
1761
1762         /* Perform the decompression. */
1763         lz_ret = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN);
1764         switch(lz_ret) {
1765                 case LZMA_DATA_ERROR:
1766                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1767                             "xz data error (error %d)", (int) lz_ret);
1768                         return (ARCHIVE_FATAL);
1769
1770                 case LZMA_NO_CHECK:
1771                 case LZMA_OK:
1772                         break;
1773
1774                 default:
1775                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1776                             "xz unknown error %d", (int) lz_ret);
1777                         return (ARCHIVE_FATAL);
1778
1779                 case LZMA_STREAM_END:
1780                         lzma_end(&zip->zipx_lzma_stream);
1781                         zip->zipx_lzma_valid = 0;
1782
1783                         if((int64_t) zip->zipx_lzma_stream.total_in !=
1784                             zip->entry_bytes_remaining)
1785                         {
1786                                 archive_set_error(&a->archive,
1787                                     ARCHIVE_ERRNO_MISC,
1788                                     "xz premature end of stream");
1789                                 return (ARCHIVE_FATAL);
1790                         }
1791
1792                         zip->end_of_entry = 1;
1793                         break;
1794         }
1795
1796         to_consume = zip->zipx_lzma_stream.total_in;
1797
1798         __archive_read_consume(a, to_consume);
1799         zip->entry_bytes_remaining -= to_consume;
1800         zip->entry_compressed_bytes_read += to_consume;
1801         zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out;
1802
1803         *size = zip->zipx_lzma_stream.total_out;
1804         *buff = zip->uncompressed_buffer;
1805
1806         ret = consume_optional_marker(a, zip);
1807         if (ret != ARCHIVE_OK)
1808                 return (ret);
1809
1810         return (ARCHIVE_OK);
1811 }
1812
1813 static int
1814 zip_read_data_zipx_lzma_alone(struct archive_read *a, const void **buff,
1815     size_t *size, int64_t *offset)
1816 {
1817         struct zip* zip = (struct zip *)(a->format->data);
1818         int ret;
1819         lzma_ret lz_ret;
1820         const void* compressed_buf;
1821         ssize_t bytes_avail, in_bytes, to_consume;
1822
1823         (void) offset; /* UNUSED */
1824
1825         /* Initialize decompressor if not yet initialized. */
1826         if (!zip->decompress_init) {
1827                 ret = zipx_lzma_alone_init(a, zip);
1828                 if (ret != ARCHIVE_OK)
1829                         return (ret);
1830         }
1831
1832         /* Fetch more compressed data. The same note as in deflate handler
1833          * applies here as well:
1834          *
1835          * Note: '1' here is a performance optimization. Recall that the
1836          * decompression layer returns a count of available bytes; asking for
1837          * more than that forces the decompressor to combine reads by copying
1838          * data.
1839          */
1840         compressed_buf = __archive_read_ahead(a, 1, &bytes_avail);
1841         if (bytes_avail < 0) {
1842                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1843                     "Truncated lzma file body");
1844                 return (ARCHIVE_FATAL);
1845         }
1846
1847         /* Set decompressor parameters. */
1848         in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail);
1849
1850         zip->zipx_lzma_stream.next_in = compressed_buf;
1851         zip->zipx_lzma_stream.avail_in = in_bytes;
1852         zip->zipx_lzma_stream.total_in = 0;
1853         zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer;
1854         zip->zipx_lzma_stream.avail_out =
1855                 /* These lzma_alone streams lack end of stream marker, so let's
1856                  * make sure the unpacker won't try to unpack more than it's
1857                  * supposed to. */
1858                 zipmin((int64_t) zip->uncompressed_buffer_size,
1859                     zip->entry->uncompressed_size -
1860                     zip->entry_uncompressed_bytes_read);
1861         zip->zipx_lzma_stream.total_out = 0;
1862
1863         /* Perform the decompression. */
1864         lz_ret = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN);
1865         switch(lz_ret) {
1866                 case LZMA_DATA_ERROR:
1867                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1868                             "lzma data error (error %d)", (int) lz_ret);
1869                         return (ARCHIVE_FATAL);
1870
1871                 /* This case is optional in lzma alone format. It can happen,
1872                  * but most of the files don't have it. (GitHub #1257) */
1873                 case LZMA_STREAM_END:
1874                         lzma_end(&zip->zipx_lzma_stream);
1875                         zip->zipx_lzma_valid = 0;
1876                         if((int64_t) zip->zipx_lzma_stream.total_in !=
1877                             zip->entry_bytes_remaining)
1878                         {
1879                                 archive_set_error(&a->archive,
1880                                     ARCHIVE_ERRNO_MISC,
1881                                     "lzma alone premature end of stream");
1882                                 return (ARCHIVE_FATAL);
1883                         }
1884
1885                         zip->end_of_entry = 1;
1886                         break;
1887
1888                 case LZMA_OK:
1889                         break;
1890
1891                 default:
1892                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1893                             "lzma unknown error %d", (int) lz_ret);
1894                         return (ARCHIVE_FATAL);
1895         }
1896
1897         to_consume = zip->zipx_lzma_stream.total_in;
1898
1899         /* Update pointers. */
1900         __archive_read_consume(a, to_consume);
1901         zip->entry_bytes_remaining -= to_consume;
1902         zip->entry_compressed_bytes_read += to_consume;
1903         zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out;
1904
1905         if(zip->entry_bytes_remaining == 0) {
1906                 zip->end_of_entry = 1;
1907         }
1908
1909         /* Return values. */
1910         *size = zip->zipx_lzma_stream.total_out;
1911         *buff = zip->uncompressed_buffer;
1912
1913         /* Behave the same way as during deflate decompression. */
1914         ret = consume_optional_marker(a, zip);
1915         if (ret != ARCHIVE_OK)
1916                 return (ret);
1917
1918         /* Free lzma decoder handle because we'll no longer need it. */
1919         if(zip->end_of_entry) {
1920                 lzma_end(&zip->zipx_lzma_stream);
1921                 zip->zipx_lzma_valid = 0;
1922         }
1923
1924         /* If we're here, then we're good! */
1925         return (ARCHIVE_OK);
1926 }
1927 #endif /* HAVE_LZMA_H && HAVE_LIBLZMA */
1928
1929 static int
1930 zipx_ppmd8_init(struct archive_read *a, struct zip *zip)
1931 {
1932         const void* p;
1933         uint32_t val;
1934         uint32_t order;
1935         uint32_t mem;
1936         uint32_t restore_method;
1937
1938         /* Remove previous decompression context if it exists. */
1939         if(zip->ppmd8_valid) {
1940                 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8);
1941                 zip->ppmd8_valid = 0;
1942         }
1943
1944         /* Create a new decompression context. */
1945         __archive_ppmd8_functions.Ppmd8_Construct(&zip->ppmd8);
1946         zip->ppmd8_stream_failed = 0;
1947
1948         /* Setup function pointers required by Ppmd8 decompressor. The
1949          * 'ppmd_read' function will feed new bytes to the decompressor,
1950          * and will increment the 'zip->zipx_ppmd_read_compressed' counter. */
1951         zip->ppmd8.Stream.In = &zip->zipx_ppmd_stream;
1952         zip->zipx_ppmd_stream.a = a;
1953         zip->zipx_ppmd_stream.Read = &ppmd_read;
1954
1955         /* Reset number of read bytes to 0. */
1956         zip->zipx_ppmd_read_compressed = 0;
1957
1958         /* Read Ppmd8 header (2 bytes). */
1959         p = __archive_read_ahead(a, 2, NULL);
1960         if(!p) {
1961                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1962                     "Truncated file data in PPMd8 stream");
1963                 return (ARCHIVE_FATAL);
1964         }
1965         __archive_read_consume(a, 2);
1966
1967         /* Decode the stream's compression parameters. */
1968         val = archive_le16dec(p);
1969         order = (val & 15) + 1;
1970         mem = ((val >> 4) & 0xff) + 1;
1971         restore_method = (val >> 12);
1972
1973         if(order < 2 || restore_method > 2) {
1974                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1975                     "Invalid parameter set in PPMd8 stream (order=%" PRId32 ", "
1976                     "restore=%" PRId32 ")", order, restore_method);
1977                 return (ARCHIVE_FAILED);
1978         }
1979
1980         /* Allocate the memory needed to properly decompress the file. */
1981         if(!__archive_ppmd8_functions.Ppmd8_Alloc(&zip->ppmd8, mem << 20)) {
1982                 archive_set_error(&a->archive, ENOMEM,
1983                     "Unable to allocate memory for PPMd8 stream: %" PRId32 " bytes",
1984                     mem << 20);
1985                 return (ARCHIVE_FATAL);
1986         }
1987
1988         /* Signal the cleanup function to release Ppmd8 context in the
1989          * cleanup phase. */
1990         zip->ppmd8_valid = 1;
1991
1992         /* Perform further Ppmd8 initialization. */
1993         if(!__archive_ppmd8_functions.Ppmd8_RangeDec_Init(&zip->ppmd8)) {
1994                 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
1995                     "PPMd8 stream range decoder initialization error");
1996                 return (ARCHIVE_FATAL);
1997         }
1998
1999         __archive_ppmd8_functions.Ppmd8_Init(&zip->ppmd8, order,
2000             restore_method);
2001
2002         /* Allocate the buffer that will hold uncompressed data. */
2003         free(zip->uncompressed_buffer);
2004
2005         zip->uncompressed_buffer_size = 256 * 1024;
2006         zip->uncompressed_buffer =
2007             (uint8_t*) malloc(zip->uncompressed_buffer_size);
2008
2009         if(zip->uncompressed_buffer == NULL) {
2010                 archive_set_error(&a->archive, ENOMEM,
2011                     "No memory for PPMd8 decompression");
2012                 return ARCHIVE_FATAL;
2013         }
2014
2015         /* Ppmd8 initialization is done. */
2016         zip->decompress_init = 1;
2017
2018         /* We've already read 2 bytes in the output stream. Additionally,
2019          * Ppmd8 initialization code could read some data as well. So we
2020          * are advancing the stream by 2 bytes plus whatever number of
2021          * bytes Ppmd8 init function used. */
2022         zip->entry_compressed_bytes_read += 2 + zip->zipx_ppmd_read_compressed;
2023
2024         return ARCHIVE_OK;
2025 }
2026
2027 static int
2028 zip_read_data_zipx_ppmd(struct archive_read *a, const void **buff,
2029     size_t *size, int64_t *offset)
2030 {
2031         struct zip* zip = (struct zip *)(a->format->data);
2032         int ret;
2033         size_t consumed_bytes = 0;
2034         ssize_t bytes_avail = 0;
2035
2036         (void) offset; /* UNUSED */
2037
2038         /* If we're here for the first time, initialize Ppmd8 decompression
2039          * context first. */
2040         if(!zip->decompress_init) {
2041                 ret = zipx_ppmd8_init(a, zip);
2042                 if(ret != ARCHIVE_OK)
2043                         return ret;
2044         }
2045
2046         /* Fetch for more data. We're reading 1 byte here, but libarchive
2047          * should prefetch more bytes. */
2048         (void) __archive_read_ahead(a, 1, &bytes_avail);
2049         if(bytes_avail < 0) {
2050                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2051                     "Truncated PPMd8 file body");
2052                 return (ARCHIVE_FATAL);
2053         }
2054
2055         /* This counter will be updated inside ppmd_read(), which at one
2056          * point will be called by Ppmd8_DecodeSymbol. */
2057         zip->zipx_ppmd_read_compressed = 0;
2058
2059         /* Decompression loop. */
2060         do {
2061                 int sym = __archive_ppmd8_functions.Ppmd8_DecodeSymbol(
2062                     &zip->ppmd8);
2063                 if(sym < 0) {
2064                         zip->end_of_entry = 1;
2065                         break;
2066                 }
2067
2068                 /* This field is set by ppmd_read() when there was no more data
2069                  * to be read. */
2070                 if(zip->ppmd8_stream_failed) {
2071                         archive_set_error(&a->archive,
2072                             ARCHIVE_ERRNO_FILE_FORMAT,
2073                             "Truncated PPMd8 file body");
2074                         return (ARCHIVE_FATAL);
2075                 }
2076
2077                 zip->uncompressed_buffer[consumed_bytes] = (uint8_t) sym;
2078                 ++consumed_bytes;
2079         } while(consumed_bytes < zip->uncompressed_buffer_size);
2080
2081         /* Update pointers for libarchive. */
2082         *buff = zip->uncompressed_buffer;
2083         *size = consumed_bytes;
2084
2085         /* Update pointers so we can continue decompression in another call. */
2086         zip->entry_bytes_remaining -= zip->zipx_ppmd_read_compressed;
2087         zip->entry_compressed_bytes_read += zip->zipx_ppmd_read_compressed;
2088         zip->entry_uncompressed_bytes_read += consumed_bytes;
2089
2090         /* If we're at the end of stream, deinitialize Ppmd8 context. */
2091         if(zip->end_of_entry) {
2092                 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8);
2093                 zip->ppmd8_valid = 0;
2094         }
2095
2096         /* Seek for optional marker, same way as in each zip entry. */
2097         ret = consume_optional_marker(a, zip);
2098         if (ret != ARCHIVE_OK)
2099                 return ret;
2100
2101         return ARCHIVE_OK;
2102 }
2103
2104 #ifdef HAVE_BZLIB_H
2105 static int
2106 zipx_bzip2_init(struct archive_read *a, struct zip *zip)
2107 {
2108         int r;
2109
2110         /* Deallocate already existing BZ2 decompression context if it
2111          * exists. */
2112         if(zip->bzstream_valid) {
2113                 BZ2_bzDecompressEnd(&zip->bzstream);
2114                 zip->bzstream_valid = 0;
2115         }
2116
2117         /* Allocate a new BZ2 decompression context. */
2118         memset(&zip->bzstream, 0, sizeof(bz_stream));
2119         r = BZ2_bzDecompressInit(&zip->bzstream, 0, 1);
2120         if(r != BZ_OK) {
2121                 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC,
2122                     "bzip2 initialization failed(%d)",
2123                     r);
2124
2125                 return ARCHIVE_FAILED;
2126         }
2127
2128         /* Mark the bzstream field to be released in cleanup phase. */
2129         zip->bzstream_valid = 1;
2130
2131         /* (Re)allocate the buffer that will contain decompressed bytes. */
2132         free(zip->uncompressed_buffer);
2133
2134         zip->uncompressed_buffer_size = 256 * 1024;
2135         zip->uncompressed_buffer =
2136             (uint8_t*) malloc(zip->uncompressed_buffer_size);
2137         if (zip->uncompressed_buffer == NULL) {
2138                 archive_set_error(&a->archive, ENOMEM,
2139                     "No memory for bzip2 decompression");
2140                     return ARCHIVE_FATAL;
2141         }
2142
2143         /* Initialization done. */
2144         zip->decompress_init = 1;
2145         return ARCHIVE_OK;
2146 }
2147
2148 static int
2149 zip_read_data_zipx_bzip2(struct archive_read *a, const void **buff,
2150     size_t *size, int64_t *offset)
2151 {
2152         struct zip *zip = (struct zip *)(a->format->data);
2153         ssize_t bytes_avail = 0, in_bytes, to_consume;
2154         const void *compressed_buff;
2155         int r;
2156         uint64_t total_out;
2157
2158         (void) offset; /* UNUSED */
2159
2160         /* Initialize decompression context if we're here for the first time. */
2161         if(!zip->decompress_init) {
2162                 r = zipx_bzip2_init(a, zip);
2163                 if(r != ARCHIVE_OK)
2164                         return r;
2165         }
2166
2167         /* Fetch more compressed bytes. */
2168         compressed_buff = __archive_read_ahead(a, 1, &bytes_avail);
2169         if(bytes_avail < 0) {
2170                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2171                     "Truncated bzip2 file body");
2172                 return (ARCHIVE_FATAL);
2173         }
2174
2175         in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail);
2176         if(in_bytes < 1) {
2177                 /* libbz2 doesn't complain when caller feeds avail_in == 0.
2178                  * It will actually return success in this case, which is
2179                  * undesirable. This is why we need to make this check
2180                  * manually. */
2181
2182                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2183                     "Truncated bzip2 file body");
2184                 return (ARCHIVE_FATAL);
2185         }
2186
2187         /* Setup buffer boundaries. */
2188         zip->bzstream.next_in = (char*)(uintptr_t) compressed_buff;
2189         zip->bzstream.avail_in = in_bytes;
2190         zip->bzstream.total_in_hi32 = 0;
2191         zip->bzstream.total_in_lo32 = 0;
2192         zip->bzstream.next_out = (char*) zip->uncompressed_buffer;
2193         zip->bzstream.avail_out = zip->uncompressed_buffer_size;
2194         zip->bzstream.total_out_hi32 = 0;
2195         zip->bzstream.total_out_lo32 = 0;
2196
2197         /* Perform the decompression. */
2198         r = BZ2_bzDecompress(&zip->bzstream);
2199         switch(r) {
2200                 case BZ_STREAM_END:
2201                         /* If we're at the end of the stream, deinitialize the
2202                          * decompression context now. */
2203                         switch(BZ2_bzDecompressEnd(&zip->bzstream)) {
2204                                 case BZ_OK:
2205                                         break;
2206                                 default:
2207                                         archive_set_error(&a->archive,
2208                                             ARCHIVE_ERRNO_MISC,
2209                                             "Failed to clean up bzip2 "
2210                                             "decompressor");
2211                                         return ARCHIVE_FATAL;
2212                         }
2213
2214                         zip->end_of_entry = 1;
2215                         break;
2216                 case BZ_OK:
2217                         /* The decompressor has successfully decoded this
2218                          * chunk of data, but more data is still in queue. */
2219                         break;
2220                 default:
2221                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2222                             "bzip2 decompression failed");
2223                         return ARCHIVE_FATAL;
2224         }
2225
2226         /* Update the pointers so decompressor can continue decoding. */
2227         to_consume = zip->bzstream.total_in_lo32;
2228         __archive_read_consume(a, to_consume);
2229
2230         total_out = ((uint64_t) zip->bzstream.total_out_hi32 << 32) +
2231             zip->bzstream.total_out_lo32;
2232
2233         zip->entry_bytes_remaining -= to_consume;
2234         zip->entry_compressed_bytes_read += to_consume;
2235         zip->entry_uncompressed_bytes_read += total_out;
2236
2237         /* Give libarchive its due. */
2238         *size = total_out;
2239         *buff = zip->uncompressed_buffer;
2240
2241         /* Seek for optional marker, like in other entries. */
2242         r = consume_optional_marker(a, zip);
2243         if(r != ARCHIVE_OK)
2244                 return r;
2245
2246         return ARCHIVE_OK;
2247 }
2248
2249 #endif
2250
2251 #if HAVE_ZSTD_H && HAVE_LIBZSTD
2252 static int
2253 zipx_zstd_init(struct archive_read *a, struct zip *zip)
2254 {
2255         size_t r;
2256
2257         /* Deallocate already existing Zstd decompression context if it
2258          * exists. */
2259         if(zip->zstdstream_valid) {
2260                 ZSTD_freeDStream(zip->zstdstream);
2261                 zip->zstdstream_valid = 0;
2262         }
2263
2264         /* Allocate a new Zstd decompression context. */
2265         zip->zstdstream = ZSTD_createDStream();
2266
2267         r = ZSTD_initDStream(zip->zstdstream);
2268         if (ZSTD_isError(r)) {
2269                  archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2270                         "Error initializing zstd decompressor: %s",
2271                         ZSTD_getErrorName(r));
2272
2273                 return ARCHIVE_FAILED;
2274         }
2275
2276         /* Mark the zstdstream field to be released in cleanup phase. */
2277         zip->zstdstream_valid = 1;
2278
2279         /* (Re)allocate the buffer that will contain decompressed bytes. */
2280         free(zip->uncompressed_buffer);
2281
2282         zip->uncompressed_buffer_size = ZSTD_DStreamOutSize();
2283         zip->uncompressed_buffer =
2284             (uint8_t*) malloc(zip->uncompressed_buffer_size);
2285         if (zip->uncompressed_buffer == NULL) {
2286                 archive_set_error(&a->archive, ENOMEM,
2287                         "No memory for Zstd decompression");
2288
2289                 return ARCHIVE_FATAL;
2290         }
2291
2292         /* Initialization done. */
2293         zip->decompress_init = 1;
2294         return ARCHIVE_OK;
2295 }
2296
2297 static int
2298 zip_read_data_zipx_zstd(struct archive_read *a, const void **buff,
2299     size_t *size, int64_t *offset)
2300 {
2301         struct zip *zip = (struct zip *)(a->format->data);
2302         ssize_t bytes_avail = 0, in_bytes, to_consume;
2303         const void *compressed_buff;
2304         int r;
2305         size_t ret;
2306         uint64_t total_out;
2307         ZSTD_outBuffer out;
2308         ZSTD_inBuffer in;
2309
2310         (void) offset; /* UNUSED */
2311
2312         /* Initialize decompression context if we're here for the first time. */
2313         if(!zip->decompress_init) {
2314                 r = zipx_zstd_init(a, zip);
2315                 if(r != ARCHIVE_OK)
2316                         return r;
2317         }
2318
2319         /* Fetch more compressed bytes */
2320         compressed_buff = __archive_read_ahead(a, 1, &bytes_avail);
2321         if(bytes_avail < 0) {
2322                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2323                     "Truncated zstd file body");
2324                 return (ARCHIVE_FATAL);
2325         }
2326
2327         in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail);
2328         if(in_bytes < 1) {
2329                 /* zstd doesn't complain when caller feeds avail_in == 0.
2330                  * It will actually return success in this case, which is
2331                  * undesirable. This is why we need to make this check
2332                  * manually. */
2333                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2334                     "Truncated zstd file body");
2335                 return (ARCHIVE_FATAL);
2336         }
2337
2338         /* Setup buffer boundaries */
2339         in.src = compressed_buff;
2340         in.size = in_bytes;
2341         in.pos = 0;
2342         out = (ZSTD_outBuffer) { zip->uncompressed_buffer, zip->uncompressed_buffer_size, 0 };
2343
2344         /* Perform the decompression. */
2345         ret = ZSTD_decompressStream(zip->zstdstream, &out, &in);
2346         if (ZSTD_isError(ret)) {
2347                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2348                         "Error during zstd decompression: %s",
2349                         ZSTD_getErrorName(ret));
2350                 return (ARCHIVE_FATAL);
2351         }
2352
2353         /* Check end of the stream. */
2354         if (ret == 0) {
2355                 if ((in.pos == in.size) && (out.pos < out.size)) {
2356                         zip->end_of_entry = 1;
2357                         ZSTD_freeDStream(zip->zstdstream);
2358                         zip->zstdstream_valid = 0;
2359                 }
2360         }
2361
2362         /* Update the pointers so decompressor can continue decoding. */
2363         to_consume = in.pos;
2364         __archive_read_consume(a, to_consume);
2365
2366         total_out = out.pos;
2367
2368         zip->entry_bytes_remaining -= to_consume;
2369         zip->entry_compressed_bytes_read += to_consume;
2370         zip->entry_uncompressed_bytes_read += total_out;
2371
2372         /* Give libarchive its due. */
2373         *size = total_out;
2374         *buff = zip->uncompressed_buffer;
2375
2376         /* Seek for optional marker, like in other entries. */
2377         r = consume_optional_marker(a, zip);
2378         if(r != ARCHIVE_OK)
2379                 return r;
2380
2381         return ARCHIVE_OK;
2382 }
2383 #endif
2384
2385 #ifdef HAVE_ZLIB_H
2386 static int
2387 zip_deflate_init(struct archive_read *a, struct zip *zip)
2388 {
2389         int r;
2390
2391         /* If we haven't yet read any data, initialize the decompressor. */
2392         if (!zip->decompress_init) {
2393                 if (zip->stream_valid)
2394                         r = inflateReset(&zip->stream);
2395                 else
2396                         r = inflateInit2(&zip->stream,
2397                             -15 /* Don't check for zlib header */);
2398                 if (r != Z_OK) {
2399                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2400                             "Can't initialize ZIP decompression.");
2401                         return (ARCHIVE_FATAL);
2402                 }
2403                 /* Stream structure has been set up. */
2404                 zip->stream_valid = 1;
2405                 /* We've initialized decompression for this stream. */
2406                 zip->decompress_init = 1;
2407         }
2408         return (ARCHIVE_OK);
2409 }
2410
2411 static int
2412 zip_read_data_deflate(struct archive_read *a, const void **buff,
2413     size_t *size, int64_t *offset)
2414 {
2415         struct zip *zip;
2416         ssize_t bytes_avail;
2417         const void *compressed_buff, *sp;
2418         int r;
2419
2420         (void)offset; /* UNUSED */
2421
2422         zip = (struct zip *)(a->format->data);
2423
2424         /* If the buffer hasn't been allocated, allocate it now. */
2425         if (zip->uncompressed_buffer == NULL) {
2426                 zip->uncompressed_buffer_size = 256 * 1024;
2427                 zip->uncompressed_buffer
2428                     = (unsigned char *)malloc(zip->uncompressed_buffer_size);
2429                 if (zip->uncompressed_buffer == NULL) {
2430                         archive_set_error(&a->archive, ENOMEM,
2431                             "No memory for ZIP decompression");
2432                         return (ARCHIVE_FATAL);
2433                 }
2434         }
2435
2436         r = zip_deflate_init(a, zip);
2437         if (r != ARCHIVE_OK)
2438                 return (r);
2439
2440         /*
2441          * Note: '1' here is a performance optimization.
2442          * Recall that the decompression layer returns a count of
2443          * available bytes; asking for more than that forces the
2444          * decompressor to combine reads by copying data.
2445          */
2446         compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail);
2447         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2448             && bytes_avail > zip->entry_bytes_remaining) {
2449                 bytes_avail = (ssize_t)zip->entry_bytes_remaining;
2450         }
2451         if (bytes_avail < 0) {
2452                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2453                     "Truncated ZIP file body");
2454                 return (ARCHIVE_FATAL);
2455         }
2456
2457         if (zip->tctx_valid || zip->cctx_valid) {
2458                 if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) {
2459                         size_t buff_remaining =
2460                             (zip->decrypted_buffer +
2461                             zip->decrypted_buffer_size)
2462                             - (zip->decrypted_ptr +
2463                             zip->decrypted_bytes_remaining);
2464
2465                         if (buff_remaining > (size_t)bytes_avail)
2466                                 buff_remaining = (size_t)bytes_avail;
2467
2468                         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) &&
2469                               zip->entry_bytes_remaining > 0) {
2470                                 if ((int64_t)(zip->decrypted_bytes_remaining
2471                                     + buff_remaining)
2472                                       > zip->entry_bytes_remaining) {
2473                                         if (zip->entry_bytes_remaining <
2474                                             (int64_t)zip->decrypted_bytes_remaining)
2475                                                 buff_remaining = 0;
2476                                         else
2477                                                 buff_remaining =
2478                                                     (size_t)zip->entry_bytes_remaining
2479                                                     - zip->decrypted_bytes_remaining;
2480                                 }
2481                         }
2482                         if (buff_remaining > 0) {
2483                                 if (zip->tctx_valid) {
2484                                         trad_enc_decrypt_update(&zip->tctx,
2485                                             compressed_buff, buff_remaining,
2486                                             zip->decrypted_ptr
2487                                               + zip->decrypted_bytes_remaining,
2488                                             buff_remaining);
2489                                 } else {
2490                                         size_t dsize = buff_remaining;
2491                                         archive_decrypto_aes_ctr_update(
2492                                             &zip->cctx,
2493                                             compressed_buff, buff_remaining,
2494                                             zip->decrypted_ptr
2495                                               + zip->decrypted_bytes_remaining,
2496                                             &dsize);
2497                                 }
2498                                 zip->decrypted_bytes_remaining +=
2499                                     buff_remaining;
2500                         }
2501                 }
2502                 bytes_avail = zip->decrypted_bytes_remaining;
2503                 compressed_buff = (const char *)zip->decrypted_ptr;
2504         }
2505
2506         /*
2507          * A bug in zlib.h: stream.next_in should be marked 'const'
2508          * but isn't (the library never alters data through the
2509          * next_in pointer, only reads it).  The result: this ugly
2510          * cast to remove 'const'.
2511          */
2512         zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff;
2513         zip->stream.avail_in = (uInt)bytes_avail;
2514         zip->stream.total_in = 0;
2515         zip->stream.next_out = zip->uncompressed_buffer;
2516         zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size;
2517         zip->stream.total_out = 0;
2518
2519         r = inflate(&zip->stream, 0);
2520         switch (r) {
2521         case Z_OK:
2522                 break;
2523         case Z_STREAM_END:
2524                 zip->end_of_entry = 1;
2525                 break;
2526         case Z_MEM_ERROR:
2527                 archive_set_error(&a->archive, ENOMEM,
2528                     "Out of memory for ZIP decompression");
2529                 return (ARCHIVE_FATAL);
2530         default:
2531                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2532                     "ZIP decompression failed (%d)", r);
2533                 return (ARCHIVE_FATAL);
2534         }
2535
2536         /* Consume as much as the compressor actually used. */
2537         bytes_avail = zip->stream.total_in;
2538         if (zip->tctx_valid || zip->cctx_valid) {
2539                 zip->decrypted_bytes_remaining -= bytes_avail;
2540                 if (zip->decrypted_bytes_remaining == 0)
2541                         zip->decrypted_ptr = zip->decrypted_buffer;
2542                 else
2543                         zip->decrypted_ptr += bytes_avail;
2544         }
2545         /* Calculate compressed data as much as we used.*/
2546         if (zip->hctx_valid)
2547                 archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail);
2548         __archive_read_consume(a, bytes_avail);
2549         zip->entry_bytes_remaining -= bytes_avail;
2550         zip->entry_compressed_bytes_read += bytes_avail;
2551
2552         *size = zip->stream.total_out;
2553         zip->entry_uncompressed_bytes_read += zip->stream.total_out;
2554         *buff = zip->uncompressed_buffer;
2555
2556         if (zip->end_of_entry && zip->hctx_valid) {
2557                 r = check_authentication_code(a, NULL);
2558                 if (r != ARCHIVE_OK)
2559                         return (r);
2560         }
2561
2562         r = consume_optional_marker(a, zip);
2563         if (r != ARCHIVE_OK)
2564                 return (r);
2565
2566         return (ARCHIVE_OK);
2567 }
2568 #endif
2569
2570 static int
2571 read_decryption_header(struct archive_read *a)
2572 {
2573         struct zip *zip = (struct zip *)(a->format->data);
2574         const char *p;
2575         unsigned int remaining_size;
2576         unsigned int ts;
2577
2578         /*
2579          * Read an initialization vector data field.
2580          */
2581         p = __archive_read_ahead(a, 2, NULL);
2582         if (p == NULL)
2583                 goto truncated;
2584         ts = zip->iv_size;
2585         zip->iv_size = archive_le16dec(p);
2586         __archive_read_consume(a, 2);
2587         if (ts < zip->iv_size) {
2588                 free(zip->iv);
2589                 zip->iv = NULL;
2590         }
2591         p = __archive_read_ahead(a, zip->iv_size, NULL);
2592         if (p == NULL)
2593                 goto truncated;
2594         if (zip->iv == NULL) {
2595                 zip->iv = malloc(zip->iv_size);
2596                 if (zip->iv == NULL)
2597                         goto nomem;
2598         }
2599         memcpy(zip->iv, p, zip->iv_size);
2600         __archive_read_consume(a, zip->iv_size);
2601
2602         /*
2603          * Read a size of remaining decryption header field.
2604          */
2605         p = __archive_read_ahead(a, 14, NULL);
2606         if (p == NULL)
2607                 goto truncated;
2608         remaining_size = archive_le32dec(p);
2609         if (remaining_size < 16 || remaining_size > (1 << 18))
2610                 goto corrupted;
2611
2612         /* Check if format version is supported. */
2613         if (archive_le16dec(p+4) != 3) {
2614                 archive_set_error(&a->archive,
2615                     ARCHIVE_ERRNO_FILE_FORMAT,
2616                     "Unsupported encryption format version: %u",
2617                     archive_le16dec(p+4));
2618                 return (ARCHIVE_FAILED);
2619         }
2620
2621         /*
2622          * Read an encryption algorithm field.
2623          */
2624         zip->alg_id = archive_le16dec(p+6);
2625         switch (zip->alg_id) {
2626         case 0x6601:/* DES */
2627         case 0x6602:/* RC2 */
2628         case 0x6603:/* 3DES 168 */
2629         case 0x6609:/* 3DES 112 */
2630         case 0x660E:/* AES 128 */
2631         case 0x660F:/* AES 192 */
2632         case 0x6610:/* AES 256 */
2633         case 0x6702:/* RC2 (version >= 5.2) */
2634         case 0x6720:/* Blowfish */
2635         case 0x6721:/* Twofish */
2636         case 0x6801:/* RC4 */
2637                 /* Supported encryption algorithm. */
2638                 break;
2639         default:
2640                 archive_set_error(&a->archive,
2641                     ARCHIVE_ERRNO_FILE_FORMAT,
2642                     "Unknown encryption algorithm: %u", zip->alg_id);
2643                 return (ARCHIVE_FAILED);
2644         }
2645
2646         /*
2647          * Read a bit length field.
2648          */
2649         zip->bit_len = archive_le16dec(p+8);
2650
2651         /*
2652          * Read a flags field.
2653          */
2654         zip->flags = archive_le16dec(p+10);
2655         switch (zip->flags & 0xf000) {
2656         case 0x0001: /* Password is required to decrypt. */
2657         case 0x0002: /* Certificates only. */
2658         case 0x0003: /* Password or certificate required to decrypt. */
2659                 break;
2660         default:
2661                 archive_set_error(&a->archive,
2662                     ARCHIVE_ERRNO_FILE_FORMAT,
2663                     "Unknown encryption flag: %u", zip->flags);
2664                 return (ARCHIVE_FAILED);
2665         }
2666         if ((zip->flags & 0xf000) == 0 ||
2667             (zip->flags & 0xf000) == 0x4000) {
2668                 archive_set_error(&a->archive,
2669                     ARCHIVE_ERRNO_FILE_FORMAT,
2670                     "Unknown encryption flag: %u", zip->flags);
2671                 return (ARCHIVE_FAILED);
2672         }
2673
2674         /*
2675          * Read an encrypted random data field.
2676          */
2677         ts = zip->erd_size;
2678         zip->erd_size = archive_le16dec(p+12);
2679         __archive_read_consume(a, 14);
2680         if ((zip->erd_size & 0xf) != 0 ||
2681             (zip->erd_size + 16) > remaining_size ||
2682             (zip->erd_size + 16) < zip->erd_size)
2683                 goto corrupted;
2684
2685         if (ts < zip->erd_size) {
2686                 free(zip->erd);
2687                 zip->erd = NULL;
2688         }
2689         p = __archive_read_ahead(a, zip->erd_size, NULL);
2690         if (p == NULL)
2691                 goto truncated;
2692         if (zip->erd == NULL) {
2693                 zip->erd = malloc(zip->erd_size);
2694                 if (zip->erd == NULL)
2695                         goto nomem;
2696         }
2697         memcpy(zip->erd, p, zip->erd_size);
2698         __archive_read_consume(a, zip->erd_size);
2699
2700         /*
2701          * Read a reserved data field.
2702          */
2703         p = __archive_read_ahead(a, 4, NULL);
2704         if (p == NULL)
2705                 goto truncated;
2706         /* Reserved data size should be zero. */
2707         if (archive_le32dec(p) != 0)
2708                 goto corrupted;
2709         __archive_read_consume(a, 4);
2710
2711         /*
2712          * Read a password validation data field.
2713          */
2714         p = __archive_read_ahead(a, 2, NULL);
2715         if (p == NULL)
2716                 goto truncated;
2717         ts = zip->v_size;
2718         zip->v_size = archive_le16dec(p);
2719         __archive_read_consume(a, 2);
2720         if ((zip->v_size & 0x0f) != 0 ||
2721             (zip->erd_size + zip->v_size + 16) > remaining_size ||
2722             (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size))
2723                 goto corrupted;
2724         if (ts < zip->v_size) {
2725                 free(zip->v_data);
2726                 zip->v_data = NULL;
2727         }
2728         p = __archive_read_ahead(a, zip->v_size, NULL);
2729         if (p == NULL)
2730                 goto truncated;
2731         if (zip->v_data == NULL) {
2732                 zip->v_data = malloc(zip->v_size);
2733                 if (zip->v_data == NULL)
2734                         goto nomem;
2735         }
2736         memcpy(zip->v_data, p, zip->v_size);
2737         __archive_read_consume(a, zip->v_size);
2738
2739         p = __archive_read_ahead(a, 4, NULL);
2740         if (p == NULL)
2741                 goto truncated;
2742         zip->v_crc32 = archive_le32dec(p);
2743         __archive_read_consume(a, 4);
2744
2745         /*return (ARCHIVE_OK);
2746          * This is not fully implemented yet.*/
2747         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2748             "Encrypted file is unsupported");
2749         return (ARCHIVE_FAILED);
2750 truncated:
2751         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2752             "Truncated ZIP file data");
2753         return (ARCHIVE_FATAL);
2754 corrupted:
2755         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2756             "Corrupted ZIP file data");
2757         return (ARCHIVE_FATAL);
2758 nomem:
2759         archive_set_error(&a->archive, ENOMEM,
2760             "No memory for ZIP decryption");
2761         return (ARCHIVE_FATAL);
2762 }
2763
2764 static int
2765 zip_alloc_decryption_buffer(struct archive_read *a)
2766 {
2767         struct zip *zip = (struct zip *)(a->format->data);
2768         size_t bs = 256 * 1024;
2769
2770         if (zip->decrypted_buffer == NULL) {
2771                 zip->decrypted_buffer_size = bs;
2772                 zip->decrypted_buffer = malloc(bs);
2773                 if (zip->decrypted_buffer == NULL) {
2774                         archive_set_error(&a->archive, ENOMEM,
2775                             "No memory for ZIP decryption");
2776                         return (ARCHIVE_FATAL);
2777                 }
2778         }
2779         zip->decrypted_ptr = zip->decrypted_buffer;
2780         return (ARCHIVE_OK);
2781 }
2782
2783 static int
2784 init_traditional_PKWARE_decryption(struct archive_read *a)
2785 {
2786         struct zip *zip = (struct zip *)(a->format->data);
2787         const void *p;
2788         int retry;
2789         int r;
2790
2791         if (zip->tctx_valid)
2792                 return (ARCHIVE_OK);
2793
2794         /*
2795            Read the 12 bytes encryption header stored at
2796            the start of the data area.
2797          */
2798 #define ENC_HEADER_SIZE 12
2799         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2800             && zip->entry_bytes_remaining < ENC_HEADER_SIZE) {
2801                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2802                     "Truncated Zip encrypted body: only %jd bytes available",
2803                     (intmax_t)zip->entry_bytes_remaining);
2804                 return (ARCHIVE_FATAL);
2805         }
2806
2807         p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL);
2808         if (p == NULL) {
2809                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2810                     "Truncated ZIP file data");
2811                 return (ARCHIVE_FATAL);
2812         }
2813
2814         for (retry = 0;; retry++) {
2815                 const char *passphrase;
2816                 uint8_t crcchk;
2817
2818                 passphrase = __archive_read_next_passphrase(a);
2819                 if (passphrase == NULL) {
2820                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2821                             (retry > 0)?
2822                                 "Incorrect passphrase":
2823                                 "Passphrase required for this entry");
2824                         return (ARCHIVE_FAILED);
2825                 }
2826
2827                 /*
2828                  * Initialize ctx for Traditional PKWARE Decryption.
2829                  */
2830                 r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase),
2831                         p, ENC_HEADER_SIZE, &crcchk);
2832                 if (r == 0 && crcchk == zip->entry->decdat)
2833                         break;/* The passphrase is OK. */
2834                 if (retry > 10000) {
2835                         /* Avoid infinity loop. */
2836                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2837                             "Too many incorrect passphrases");
2838                         return (ARCHIVE_FAILED);
2839                 }
2840         }
2841
2842         __archive_read_consume(a, ENC_HEADER_SIZE);
2843         zip->tctx_valid = 1;
2844         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
2845             zip->entry_bytes_remaining -= ENC_HEADER_SIZE;
2846         }
2847         /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/
2848         zip->entry_compressed_bytes_read += ENC_HEADER_SIZE;
2849         zip->decrypted_bytes_remaining = 0;
2850
2851         return (zip_alloc_decryption_buffer(a));
2852 #undef ENC_HEADER_SIZE
2853 }
2854
2855 static int
2856 init_WinZip_AES_decryption(struct archive_read *a)
2857 {
2858         struct zip *zip = (struct zip *)(a->format->data);
2859         const void *p;
2860         const uint8_t *pv;
2861         size_t key_len, salt_len;
2862         uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE];
2863         int retry;
2864         int r;
2865
2866         if (zip->cctx_valid || zip->hctx_valid)
2867                 return (ARCHIVE_OK);
2868
2869         switch (zip->entry->aes_extra.strength) {
2870         case 1: salt_len = 8;  key_len = 16; break;
2871         case 2: salt_len = 12; key_len = 24; break;
2872         case 3: salt_len = 16; key_len = 32; break;
2873         default: goto corrupted;
2874         }
2875         p = __archive_read_ahead(a, salt_len + 2, NULL);
2876         if (p == NULL)
2877                 goto truncated;
2878
2879         for (retry = 0;; retry++) {
2880                 const char *passphrase;
2881
2882                 passphrase = __archive_read_next_passphrase(a);
2883                 if (passphrase == NULL) {
2884                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2885                             (retry > 0)?
2886                                 "Incorrect passphrase":
2887                                 "Passphrase required for this entry");
2888                         return (ARCHIVE_FAILED);
2889                 }
2890                 memset(derived_key, 0, sizeof(derived_key));
2891                 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase),
2892                     p, salt_len, 1000, derived_key, key_len * 2 + 2);
2893                 if (r != 0) {
2894                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2895                             "Decryption is unsupported due to lack of "
2896                             "crypto library");
2897                         return (ARCHIVE_FAILED);
2898                 }
2899
2900                 /* Check password verification value. */
2901                 pv = ((const uint8_t *)p) + salt_len;
2902                 if (derived_key[key_len * 2] == pv[0] &&
2903                     derived_key[key_len * 2 + 1] == pv[1])
2904                         break;/* The passphrase is OK. */
2905                 if (retry > 10000) {
2906                         /* Avoid infinity loop. */
2907                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2908                             "Too many incorrect passphrases");
2909                         return (ARCHIVE_FAILED);
2910                 }
2911         }
2912
2913         r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len);
2914         if (r != 0) {
2915                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2916                     "Decryption is unsupported due to lack of crypto library");
2917                 return (ARCHIVE_FAILED);
2918         }
2919         r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len);
2920         if (r != 0) {
2921                 archive_decrypto_aes_ctr_release(&zip->cctx);
2922                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2923                     "Failed to initialize HMAC-SHA1");
2924                 return (ARCHIVE_FAILED);
2925         }
2926         zip->cctx_valid = zip->hctx_valid = 1;
2927         __archive_read_consume(a, salt_len + 2);
2928         zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE;
2929         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2930             && zip->entry_bytes_remaining < 0)
2931                 goto corrupted;
2932         zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE;
2933         zip->decrypted_bytes_remaining = 0;
2934
2935         zip->entry->compression = zip->entry->aes_extra.compression;
2936         return (zip_alloc_decryption_buffer(a));
2937
2938 truncated:
2939         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2940             "Truncated ZIP file data");
2941         return (ARCHIVE_FATAL);
2942 corrupted:
2943         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2944             "Corrupted ZIP file data");
2945         return (ARCHIVE_FATAL);
2946 }
2947
2948 static int
2949 archive_read_format_zip_read_data(struct archive_read *a,
2950     const void **buff, size_t *size, int64_t *offset)
2951 {
2952         int r;
2953         struct zip *zip = (struct zip *)(a->format->data);
2954
2955         if (zip->has_encrypted_entries ==
2956                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
2957                 zip->has_encrypted_entries = 0;
2958         }
2959
2960         *offset = zip->entry_uncompressed_bytes_read;
2961         *size = 0;
2962         *buff = NULL;
2963
2964         /* If we hit end-of-entry last time, return ARCHIVE_EOF. */
2965         if (zip->end_of_entry)
2966                 return (ARCHIVE_EOF);
2967
2968         /* Return EOF immediately if this is a non-regular file. */
2969         if (AE_IFREG != (zip->entry->mode & AE_IFMT))
2970                 return (ARCHIVE_EOF);
2971
2972         __archive_read_consume(a, zip->unconsumed);
2973         zip->unconsumed = 0;
2974
2975         if (zip->init_decryption) {
2976                 zip->has_encrypted_entries = 1;
2977                 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
2978                         r = read_decryption_header(a);
2979                 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
2980                         r = init_WinZip_AES_decryption(a);
2981                 else
2982                         r = init_traditional_PKWARE_decryption(a);
2983                 if (r != ARCHIVE_OK)
2984                         return (r);
2985                 zip->init_decryption = 0;
2986         }
2987
2988         switch(zip->entry->compression) {
2989         case 0:  /* No compression. */
2990                 r =  zip_read_data_none(a, buff, size, offset);
2991                 break;
2992 #ifdef HAVE_BZLIB_H
2993         case 12: /* ZIPx bzip2 compression. */
2994                 r = zip_read_data_zipx_bzip2(a, buff, size, offset);
2995                 break;
2996 #endif
2997 #if HAVE_LZMA_H && HAVE_LIBLZMA
2998         case 14: /* ZIPx LZMA compression. */
2999                 r = zip_read_data_zipx_lzma_alone(a, buff, size, offset);
3000                 break;
3001         case 95: /* ZIPx XZ compression. */
3002                 r = zip_read_data_zipx_xz(a, buff, size, offset);
3003                 break;
3004 #endif
3005 #if HAVE_ZSTD_H && HAVE_LIBZSTD
3006         case 93: /* ZIPx Zstd compression. */
3007                 r = zip_read_data_zipx_zstd(a, buff, size, offset);
3008                 break;
3009 #endif
3010         /* PPMd support is built-in, so we don't need any #if guards. */
3011         case 98: /* ZIPx PPMd compression. */
3012                 r = zip_read_data_zipx_ppmd(a, buff, size, offset);
3013                 break;
3014
3015 #ifdef HAVE_ZLIB_H
3016         case 8: /* Deflate compression. */
3017                 r =  zip_read_data_deflate(a, buff, size, offset);
3018                 break;
3019 #endif
3020         default: /* Unsupported compression. */
3021                 /* Return a warning. */
3022                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
3023                     "Unsupported ZIP compression method (%d: %s)",
3024                     zip->entry->compression, compression_name(zip->entry->compression));
3025                 /* We can't decompress this entry, but we will
3026                  * be able to skip() it and try the next entry. */
3027                 return (ARCHIVE_FAILED);
3028                 break;
3029         }
3030         if (r != ARCHIVE_OK)
3031                 return (r);
3032         /* Update checksum */
3033         if (*size)
3034                 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff,
3035                     (unsigned)*size);
3036         /* If we hit the end, swallow any end-of-data marker. */
3037         if (zip->end_of_entry) {
3038                 /* Check file size, CRC against these values. */
3039                 if (zip->entry->compressed_size !=
3040                     zip->entry_compressed_bytes_read) {
3041                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
3042                             "ZIP compressed data is wrong size "
3043                             "(read %jd, expected %jd)",
3044                             (intmax_t)zip->entry_compressed_bytes_read,
3045                             (intmax_t)zip->entry->compressed_size);
3046                         return (ARCHIVE_WARN);
3047                 }
3048                 /* Size field only stores the lower 32 bits of the actual
3049                  * size. */
3050                 if ((zip->entry->uncompressed_size & UINT32_MAX)
3051                     != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) {
3052                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
3053                             "ZIP uncompressed data is wrong size "
3054                             "(read %jd, expected %jd)\n",
3055                             (intmax_t)zip->entry_uncompressed_bytes_read,
3056                             (intmax_t)zip->entry->uncompressed_size);
3057                         return (ARCHIVE_WARN);
3058                 }
3059                 /* Check computed CRC against header */
3060                 if ((!zip->hctx_valid ||
3061                       zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) &&
3062                    zip->entry->crc32 != zip->entry_crc32
3063                     && !zip->ignore_crc32) {
3064                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
3065                             "ZIP bad CRC: 0x%lx should be 0x%lx",
3066                             (unsigned long)zip->entry_crc32,
3067                             (unsigned long)zip->entry->crc32);
3068                         return (ARCHIVE_WARN);
3069                 }
3070         }
3071
3072         return (ARCHIVE_OK);
3073 }
3074
3075 static int
3076 archive_read_format_zip_cleanup(struct archive_read *a)
3077 {
3078         struct zip *zip;
3079         struct zip_entry *zip_entry, *next_zip_entry;
3080
3081         zip = (struct zip *)(a->format->data);
3082
3083 #ifdef HAVE_ZLIB_H
3084         if (zip->stream_valid)
3085                 inflateEnd(&zip->stream);
3086 #endif
3087
3088 #if HAVE_LZMA_H && HAVE_LIBLZMA
3089     if (zip->zipx_lzma_valid) {
3090                 lzma_end(&zip->zipx_lzma_stream);
3091         }
3092 #endif
3093
3094 #ifdef HAVE_BZLIB_H
3095         if (zip->bzstream_valid) {
3096                 BZ2_bzDecompressEnd(&zip->bzstream);
3097         }
3098 #endif
3099
3100 #if HAVE_ZSTD_H && HAVE_LIBZSTD
3101         if (zip->zstdstream_valid) {
3102                 ZSTD_freeDStream(zip->zstdstream);
3103         }
3104 #endif
3105
3106         free(zip->uncompressed_buffer);
3107
3108         if (zip->ppmd8_valid)
3109                 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8);
3110
3111         if (zip->zip_entries) {
3112                 zip_entry = zip->zip_entries;
3113                 while (zip_entry != NULL) {
3114                         next_zip_entry = zip_entry->next;
3115                         archive_string_free(&zip_entry->rsrcname);
3116                         free(zip_entry);
3117                         zip_entry = next_zip_entry;
3118                 }
3119         }
3120         free(zip->decrypted_buffer);
3121         if (zip->cctx_valid)
3122                 archive_decrypto_aes_ctr_release(&zip->cctx);
3123         if (zip->hctx_valid)
3124                 archive_hmac_sha1_cleanup(&zip->hctx);
3125         free(zip->iv);
3126         free(zip->erd);
3127         free(zip->v_data);
3128         archive_string_free(&zip->format_name);
3129         free(zip);
3130         (a->format->data) = NULL;
3131         return (ARCHIVE_OK);
3132 }
3133
3134 static int
3135 archive_read_format_zip_has_encrypted_entries(struct archive_read *_a)
3136 {
3137         if (_a && _a->format) {
3138                 struct zip * zip = (struct zip *)_a->format->data;
3139                 if (zip) {
3140                         return zip->has_encrypted_entries;
3141                 }
3142         }
3143         return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
3144 }
3145
3146 static int
3147 archive_read_format_zip_options(struct archive_read *a,
3148     const char *key, const char *val)
3149 {
3150         struct zip *zip;
3151         int ret = ARCHIVE_FAILED;
3152
3153         zip = (struct zip *)(a->format->data);
3154         if (strcmp(key, "compat-2x")  == 0) {
3155                 /* Handle filenames as libarchive 2.x */
3156                 zip->init_default_conversion = (val != NULL) ? 1 : 0;
3157                 return (ARCHIVE_OK);
3158         } else if (strcmp(key, "hdrcharset")  == 0) {
3159                 if (val == NULL || val[0] == 0)
3160                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
3161                             "zip: hdrcharset option needs a character-set name"
3162                         );
3163                 else {
3164                         zip->sconv = archive_string_conversion_from_charset(
3165                             &a->archive, val, 0);
3166                         if (zip->sconv != NULL) {
3167                                 if (strcmp(val, "UTF-8") == 0)
3168                                         zip->sconv_utf8 = zip->sconv;
3169                                 ret = ARCHIVE_OK;
3170                         } else
3171                                 ret = ARCHIVE_FATAL;
3172                 }
3173                 return (ret);
3174         } else if (strcmp(key, "ignorecrc32") == 0) {
3175                 /* Mostly useful for testing. */
3176                 if (val == NULL || val[0] == 0) {
3177                         zip->crc32func = real_crc32;
3178                         zip->ignore_crc32 = 0;
3179                 } else {
3180                         zip->crc32func = fake_crc32;
3181                         zip->ignore_crc32 = 1;
3182                 }
3183                 return (ARCHIVE_OK);
3184         } else if (strcmp(key, "mac-ext") == 0) {
3185                 zip->process_mac_extensions = (val != NULL && val[0] != 0);
3186                 return (ARCHIVE_OK);
3187         }
3188
3189         /* Note: The "warn" return is just to inform the options
3190          * supervisor that we didn't handle it.  It will generate
3191          * a suitable error if no one used this option. */
3192         return (ARCHIVE_WARN);
3193 }
3194
3195 int
3196 archive_read_support_format_zip(struct archive *a)
3197 {
3198         int r;
3199         r = archive_read_support_format_zip_streamable(a);
3200         if (r != ARCHIVE_OK)
3201                 return r;
3202         return (archive_read_support_format_zip_seekable(a));
3203 }
3204
3205 /* ------------------------------------------------------------------------ */
3206
3207 /*
3208  * Streaming-mode support
3209  */
3210
3211
3212 static int
3213 archive_read_support_format_zip_capabilities_streamable(struct archive_read * a)
3214 {
3215         (void)a; /* UNUSED */
3216         return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
3217                 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
3218 }
3219
3220 static int
3221 archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid)
3222 {
3223         const char *p;
3224
3225         (void)best_bid; /* UNUSED */
3226
3227         if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
3228                 return (-1);
3229
3230         /*
3231          * Bid of 29 here comes from:
3232          *  + 16 bits for "PK",
3233          *  + next 16-bit field has 6 options so contributes
3234          *    about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits
3235          *
3236          * So we've effectively verified ~29 total bits of check data.
3237          */
3238         if (p[0] == 'P' && p[1] == 'K') {
3239                 if ((p[2] == '\001' && p[3] == '\002')
3240                     || (p[2] == '\003' && p[3] == '\004')
3241                     || (p[2] == '\005' && p[3] == '\006')
3242                     || (p[2] == '\006' && p[3] == '\006')
3243                     || (p[2] == '\007' && p[3] == '\010')
3244                     || (p[2] == '0' && p[3] == '0'))
3245                         return (29);
3246         }
3247
3248         /* TODO: It's worth looking ahead a little bit for a valid
3249          * PK signature.  In particular, that would make it possible
3250          * to read some UUEncoded SFX files or SFX files coming from
3251          * a network socket. */
3252
3253         return (0);
3254 }
3255
3256 static int
3257 archive_read_format_zip_streamable_read_header(struct archive_read *a,
3258     struct archive_entry *entry)
3259 {
3260         struct zip *zip;
3261
3262         a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
3263         if (a->archive.archive_format_name == NULL)
3264                 a->archive.archive_format_name = "ZIP";
3265
3266         zip = (struct zip *)(a->format->data);
3267
3268         /*
3269          * It should be sufficient to call archive_read_next_header() for
3270          * a reader to determine if an entry is encrypted or not. If the
3271          * encryption of an entry is only detectable when calling
3272          * archive_read_data(), so be it. We'll do the same check there
3273          * as well.
3274          */
3275         if (zip->has_encrypted_entries ==
3276                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
3277                 zip->has_encrypted_entries = 0;
3278
3279         /* Make sure we have a zip_entry structure to use. */
3280         if (zip->zip_entries == NULL) {
3281                 zip->zip_entries = malloc(sizeof(struct zip_entry));
3282                 if (zip->zip_entries == NULL) {
3283                         archive_set_error(&a->archive, ENOMEM,
3284                             "Out  of memory");
3285                         return ARCHIVE_FATAL;
3286                 }
3287         }
3288         zip->entry = zip->zip_entries;
3289         memset(zip->entry, 0, sizeof(struct zip_entry));
3290
3291         if (zip->cctx_valid)
3292                 archive_decrypto_aes_ctr_release(&zip->cctx);
3293         if (zip->hctx_valid)
3294                 archive_hmac_sha1_cleanup(&zip->hctx);
3295         zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
3296         __archive_read_reset_passphrase(a);
3297
3298         /* Search ahead for the next local file header. */
3299         __archive_read_consume(a, zip->unconsumed);
3300         zip->unconsumed = 0;
3301         for (;;) {
3302                 int64_t skipped = 0;
3303                 const char *p, *end;
3304                 ssize_t bytes;
3305
3306                 p = __archive_read_ahead(a, 4, &bytes);
3307                 if (p == NULL)
3308                         return (ARCHIVE_FATAL);
3309                 end = p + bytes;
3310
3311                 while (p + 4 <= end) {
3312                         if (p[0] == 'P' && p[1] == 'K') {
3313                                 if (p[2] == '\003' && p[3] == '\004') {
3314                                         /* Regular file entry. */
3315                                         __archive_read_consume(a, skipped);
3316                                         return zip_read_local_file_header(a,
3317                                             entry, zip);
3318                                 }
3319
3320                               /*
3321                                * TODO: We cannot restore permissions
3322                                * based only on the local file headers.
3323                                * Consider scanning the central
3324                                * directory and returning additional
3325                                * entries for at least directories.
3326                                * This would allow us to properly set
3327                                * directory permissions.
3328                                *
3329                                * This won't help us fix symlinks
3330                                * and may not help with regular file
3331                                * permissions, either.  <sigh>
3332                                */
3333                               if (p[2] == '\001' && p[3] == '\002') {
3334                                       return (ARCHIVE_EOF);
3335                               }
3336
3337                               /* End of central directory?  Must be an
3338                                * empty archive. */
3339                               if ((p[2] == '\005' && p[3] == '\006')
3340                                   || (p[2] == '\006' && p[3] == '\006'))
3341                                       return (ARCHIVE_EOF);
3342                         }
3343                         ++p;
3344                         ++skipped;
3345                 }
3346                 __archive_read_consume(a, skipped);
3347         }
3348 }
3349
3350 static int
3351 archive_read_format_zip_read_data_skip_streamable(struct archive_read *a)
3352 {
3353         struct zip *zip;
3354         int64_t bytes_skipped;
3355
3356         zip = (struct zip *)(a->format->data);
3357         bytes_skipped = __archive_read_consume(a, zip->unconsumed);
3358         zip->unconsumed = 0;
3359         if (bytes_skipped < 0)
3360                 return (ARCHIVE_FATAL);
3361
3362         /* If we've already read to end of data, we're done. */
3363         if (zip->end_of_entry)
3364                 return (ARCHIVE_OK);
3365
3366         /* So we know we're streaming... */
3367         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
3368             || zip->entry->compressed_size > 0) {
3369                 /* We know the compressed length, so we can just skip. */
3370                 bytes_skipped = __archive_read_consume(a,
3371                                         zip->entry_bytes_remaining);
3372                 if (bytes_skipped < 0)
3373                         return (ARCHIVE_FATAL);
3374                 return (ARCHIVE_OK);
3375         }
3376
3377         if (zip->init_decryption) {
3378                 int r;
3379
3380                 zip->has_encrypted_entries = 1;
3381                 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
3382                         r = read_decryption_header(a);
3383                 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
3384                         r = init_WinZip_AES_decryption(a);
3385                 else
3386                         r = init_traditional_PKWARE_decryption(a);
3387                 if (r != ARCHIVE_OK)
3388                         return (r);
3389                 zip->init_decryption = 0;
3390         }
3391
3392         /* We're streaming and we don't know the length. */
3393         /* If the body is compressed and we know the format, we can
3394          * find an exact end-of-entry by decompressing it. */
3395         switch (zip->entry->compression) {
3396 #ifdef HAVE_ZLIB_H
3397         case 8: /* Deflate compression. */
3398                 while (!zip->end_of_entry) {
3399                         int64_t offset = 0;
3400                         const void *buff = NULL;
3401                         size_t size = 0;
3402                         int r;
3403                         r =  zip_read_data_deflate(a, &buff, &size, &offset);
3404                         if (r != ARCHIVE_OK)
3405                                 return (r);
3406                 }
3407                 return ARCHIVE_OK;
3408 #endif
3409         default: /* Uncompressed or unknown. */
3410                 /* Scan for a PK\007\010 signature. */
3411                 for (;;) {
3412                         const char *p, *buff;
3413                         ssize_t bytes_avail;
3414                         buff = __archive_read_ahead(a, 16, &bytes_avail);
3415                         if (bytes_avail < 16) {
3416                                 archive_set_error(&a->archive,
3417                                     ARCHIVE_ERRNO_FILE_FORMAT,
3418                                     "Truncated ZIP file data");
3419                                 return (ARCHIVE_FATAL);
3420                         }
3421                         p = buff;
3422                         while (p <= buff + bytes_avail - 16) {
3423                                 if (p[3] == 'P') { p += 3; }
3424                                 else if (p[3] == 'K') { p += 2; }
3425                                 else if (p[3] == '\007') { p += 1; }
3426                                 else if (p[3] == '\010' && p[2] == '\007'
3427                                     && p[1] == 'K' && p[0] == 'P') {
3428                                         if (zip->entry->flags & LA_USED_ZIP64)
3429                                                 __archive_read_consume(a,
3430                                                     p - buff + 24);
3431                                         else
3432                                                 __archive_read_consume(a,
3433                                                     p - buff + 16);
3434                                         return ARCHIVE_OK;
3435                                 } else { p += 4; }
3436                         }
3437                         __archive_read_consume(a, p - buff);
3438                 }
3439         }
3440 }
3441
3442 int
3443 archive_read_support_format_zip_streamable(struct archive *_a)
3444 {
3445         struct archive_read *a = (struct archive_read *)_a;
3446         struct zip *zip;
3447         int r;
3448
3449         archive_check_magic(_a, ARCHIVE_READ_MAGIC,
3450             ARCHIVE_STATE_NEW, "archive_read_support_format_zip");
3451
3452         zip = (struct zip *)calloc(1, sizeof(*zip));
3453         if (zip == NULL) {
3454                 archive_set_error(&a->archive, ENOMEM,
3455                     "Can't allocate zip data");
3456                 return (ARCHIVE_FATAL);
3457         }
3458
3459         /* Streamable reader doesn't support mac extensions. */
3460         zip->process_mac_extensions = 0;
3461
3462         /*
3463          * Until enough data has been read, we cannot tell about
3464          * any encrypted entries yet.
3465          */
3466         zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
3467         zip->crc32func = real_crc32;
3468
3469         r = __archive_read_register_format(a,
3470             zip,
3471             "zip",
3472             archive_read_format_zip_streamable_bid,
3473             archive_read_format_zip_options,
3474             archive_read_format_zip_streamable_read_header,
3475             archive_read_format_zip_read_data,
3476             archive_read_format_zip_read_data_skip_streamable,
3477             NULL,
3478             archive_read_format_zip_cleanup,
3479             archive_read_support_format_zip_capabilities_streamable,
3480             archive_read_format_zip_has_encrypted_entries);
3481
3482         if (r != ARCHIVE_OK)
3483                 free(zip);
3484         return (ARCHIVE_OK);
3485 }
3486
3487 /* ------------------------------------------------------------------------ */
3488
3489 /*
3490  * Seeking-mode support
3491  */
3492
3493 static int
3494 archive_read_support_format_zip_capabilities_seekable(struct archive_read * a)
3495 {
3496         (void)a; /* UNUSED */
3497         return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
3498                 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
3499 }
3500
3501 /*
3502  * TODO: This is a performance sink because it forces the read core to
3503  * drop buffered data from the start of file, which will then have to
3504  * be re-read again if this bidder loses.
3505  *
3506  * We workaround this a little by passing in the best bid so far so
3507  * that later bidders can do nothing if they know they'll never
3508  * outbid.  But we can certainly do better...
3509  */
3510 static int
3511 read_eocd(struct zip *zip, const char *p, int64_t current_offset)
3512 {
3513         uint16_t disk_num;
3514         uint32_t cd_size, cd_offset;
3515
3516         disk_num = archive_le16dec(p + 4);
3517         cd_size = archive_le32dec(p + 12);
3518         cd_offset = archive_le32dec(p + 16);
3519
3520         /* Sanity-check the EOCD we've found. */
3521
3522         /* This must be the first volume. */
3523         if (disk_num != 0)
3524                 return 0;
3525         /* Central directory must be on this volume. */
3526         if (disk_num != archive_le16dec(p + 6))
3527                 return 0;
3528         /* All central directory entries must be on this volume. */
3529         if (archive_le16dec(p + 10) != archive_le16dec(p + 8))
3530                 return 0;
3531         /* Central directory can't extend beyond start of EOCD record. */
3532         if (cd_offset + cd_size > current_offset)
3533                 return 0;
3534
3535         /* Save the central directory location for later use. */
3536         zip->central_directory_offset = cd_offset;
3537         zip->central_directory_offset_adjusted = current_offset - cd_size;
3538
3539         /* This is just a tiny bit higher than the maximum
3540            returned by the streaming Zip bidder.  This ensures
3541            that the more accurate seeking Zip parser wins
3542            whenever seek is available. */
3543         return 32;
3544 }
3545
3546 /*
3547  * Examine Zip64 EOCD locator:  If it's valid, store the information
3548  * from it.
3549  */
3550 static int
3551 read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p)
3552 {
3553         int64_t eocd64_offset;
3554         int64_t eocd64_size;
3555
3556         /* Sanity-check the locator record. */
3557
3558         /* Central dir must be on first volume. */
3559         if (archive_le32dec(p + 4) != 0)
3560                 return 0;
3561         /* Must be only a single volume. */
3562         if (archive_le32dec(p + 16) != 1)
3563                 return 0;
3564
3565         /* Find the Zip64 EOCD record. */
3566         eocd64_offset = archive_le64dec(p + 8);
3567         if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0)
3568                 return 0;
3569         if ((p = __archive_read_ahead(a, 56, NULL)) == NULL)
3570                 return 0;
3571         /* Make sure we can read all of it. */
3572         eocd64_size = archive_le64dec(p + 4) + 12;
3573         if (eocd64_size < 56 || eocd64_size > 16384)
3574                 return 0;
3575         if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL)
3576                 return 0;
3577
3578         /* Sanity-check the EOCD64 */
3579         if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */
3580                 return 0;
3581         if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */
3582                 return 0;
3583         /* CD can't be split. */
3584         if (archive_le64dec(p + 24) != archive_le64dec(p + 32))
3585                 return 0;
3586
3587         /* Save the central directory offset for later use. */
3588         zip->central_directory_offset = archive_le64dec(p + 48);
3589         /* TODO: Needs scanning backwards to find the eocd64 instead of assuming */
3590         zip->central_directory_offset_adjusted = zip->central_directory_offset;
3591
3592         return 32;
3593 }
3594
3595 static int
3596 archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid)
3597 {
3598         struct zip *zip = (struct zip *)a->format->data;
3599         int64_t file_size, current_offset;
3600         const char *p;
3601         int i, tail;
3602
3603         /* If someone has already bid more than 32, then avoid
3604            trashing the look-ahead buffers with a seek. */
3605         if (best_bid > 32)
3606                 return (-1);
3607
3608         file_size = __archive_read_seek(a, 0, SEEK_END);
3609         if (file_size <= 0)
3610                 return 0;
3611
3612         /* Search last 16k of file for end-of-central-directory
3613          * record (which starts with PK\005\006) */
3614         tail = (int)zipmin(1024 * 16, file_size);
3615         current_offset = __archive_read_seek(a, -tail, SEEK_END);
3616         if (current_offset < 0)
3617                 return 0;
3618         if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL)
3619                 return 0;
3620         /* Boyer-Moore search backwards from the end, since we want
3621          * to match the last EOCD in the file (there can be more than
3622          * one if there is an uncompressed Zip archive as a member
3623          * within this Zip archive). */
3624         for (i = tail - 22; i > 0;) {
3625                 switch (p[i]) {
3626                 case 'P':
3627                         if (memcmp(p + i, "PK\005\006", 4) == 0) {
3628                                 int ret = read_eocd(zip, p + i,
3629                                     current_offset + i);
3630                                 /* Zip64 EOCD locator precedes
3631                                  * regular EOCD if present. */
3632                                 if (i >= 20 && memcmp(p + i - 20, "PK\006\007", 4) == 0) {
3633                                         int ret_zip64 = read_zip64_eocd(a, zip, p + i - 20);
3634                                         if (ret_zip64 > ret)
3635                                                 ret = ret_zip64;
3636                                 }
3637                                 return (ret);
3638                         }
3639                         i -= 4;
3640                         break;
3641                 case 'K': i -= 1; break;
3642                 case 005: i -= 2; break;
3643                 case 006: i -= 3; break;
3644                 default: i -= 4; break;
3645                 }
3646         }
3647         return 0;
3648 }
3649
3650 /* The red-black trees are only used in seeking mode to manage
3651  * the in-memory copy of the central directory. */
3652
3653 static int
3654 cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2)
3655 {
3656         const struct zip_entry *e1 = (const struct zip_entry *)n1;
3657         const struct zip_entry *e2 = (const struct zip_entry *)n2;
3658
3659         if (e1->local_header_offset > e2->local_header_offset)
3660                 return -1;
3661         if (e1->local_header_offset < e2->local_header_offset)
3662                 return 1;
3663         return 0;
3664 }
3665
3666 static int
3667 cmp_key(const struct archive_rb_node *n, const void *key)
3668 {
3669         /* This function won't be called */
3670         (void)n; /* UNUSED */
3671         (void)key; /* UNUSED */
3672         return 1;
3673 }
3674
3675 static const struct archive_rb_tree_ops rb_ops = {
3676         &cmp_node, &cmp_key
3677 };
3678
3679 static int
3680 rsrc_cmp_node(const struct archive_rb_node *n1,
3681     const struct archive_rb_node *n2)
3682 {
3683         const struct zip_entry *e1 = (const struct zip_entry *)n1;
3684         const struct zip_entry *e2 = (const struct zip_entry *)n2;
3685
3686         return (strcmp(e2->rsrcname.s, e1->rsrcname.s));
3687 }
3688
3689 static int
3690 rsrc_cmp_key(const struct archive_rb_node *n, const void *key)
3691 {
3692         const struct zip_entry *e = (const struct zip_entry *)n;
3693         return (strcmp((const char *)key, e->rsrcname.s));
3694 }
3695
3696 static const struct archive_rb_tree_ops rb_rsrc_ops = {
3697         &rsrc_cmp_node, &rsrc_cmp_key
3698 };
3699
3700 static const char *
3701 rsrc_basename(const char *name, size_t name_length)
3702 {
3703         const char *s, *r;
3704
3705         r = s = name;
3706         for (;;) {
3707                 s = memchr(s, '/', name_length - (s - name));
3708                 if (s == NULL)
3709                         break;
3710                 r = ++s;
3711         }
3712         return (r);
3713 }
3714
3715 static void
3716 expose_parent_dirs(struct zip *zip, const char *name, size_t name_length)
3717 {
3718         struct archive_string str;
3719         struct zip_entry *dir;
3720         char *s;
3721
3722         archive_string_init(&str);
3723         archive_strncpy(&str, name, name_length);
3724         for (;;) {
3725                 s = strrchr(str.s, '/');
3726                 if (s == NULL)
3727                         break;
3728                 *s = '\0';
3729                 /* Transfer the parent directory from zip->tree_rsrc RB
3730                  * tree to zip->tree RB tree to expose. */
3731                 dir = (struct zip_entry *)
3732                     __archive_rb_tree_find_node(&zip->tree_rsrc, str.s);
3733                 if (dir == NULL)
3734                         break;
3735                 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node);
3736                 archive_string_free(&dir->rsrcname);
3737                 __archive_rb_tree_insert_node(&zip->tree, &dir->node);
3738         }
3739         archive_string_free(&str);
3740 }
3741
3742 static int
3743 slurp_central_directory(struct archive_read *a, struct archive_entry* entry,
3744     struct zip *zip)
3745 {
3746         ssize_t i;
3747         unsigned found;
3748         int64_t correction;
3749         ssize_t bytes_avail;
3750         const char *p;
3751
3752         /*
3753          * Find the start of the central directory.  The end-of-CD
3754          * record has our starting point, but there are lots of
3755          * Zip archives which have had other data prepended to the
3756          * file, which makes the recorded offsets all too small.
3757          * So we search forward from the specified offset until we
3758          * find the real start of the central directory.  Then we
3759          * know the correction we need to apply to account for leading
3760          * padding.
3761          */
3762         if (__archive_read_seek(a, zip->central_directory_offset_adjusted, SEEK_SET)
3763                 < 0)
3764                 return ARCHIVE_FATAL;
3765
3766         found = 0;
3767         while (!found) {
3768                 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL)
3769                         return ARCHIVE_FATAL;
3770                 for (found = 0, i = 0; !found && i < bytes_avail - 4;) {
3771                         switch (p[i + 3]) {
3772                         case 'P': i += 3; break;
3773                         case 'K': i += 2; break;
3774                         case 001: i += 1; break;
3775                         case 002:
3776                                 if (memcmp(p + i, "PK\001\002", 4) == 0) {
3777                                         p += i;
3778                                         found = 1;
3779                                 } else
3780                                         i += 4;
3781                                 break;
3782                         case 005: i += 1; break;
3783                         case 006:
3784                                 if (memcmp(p + i, "PK\005\006", 4) == 0) {
3785                                         p += i;
3786                                         found = 1;
3787                                 } else if (memcmp(p + i, "PK\006\006", 4) == 0) {
3788                                         p += i;
3789                                         found = 1;
3790                                 } else
3791                                         i += 1;
3792                                 break;
3793                         default: i += 4; break;
3794                         }
3795                 }
3796                 __archive_read_consume(a, i);
3797         }
3798         correction = archive_filter_bytes(&a->archive, 0)
3799                         - zip->central_directory_offset;
3800
3801         __archive_rb_tree_init(&zip->tree, &rb_ops);
3802         __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops);
3803
3804         zip->central_directory_entries_total = 0;
3805         while (1) {
3806                 struct zip_entry *zip_entry;
3807                 size_t filename_length, extra_length, comment_length;
3808                 uint32_t external_attributes;
3809                 const char *name, *r;
3810
3811                 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
3812                         return ARCHIVE_FATAL;
3813                 if (memcmp(p, "PK\006\006", 4) == 0
3814                     || memcmp(p, "PK\005\006", 4) == 0) {
3815                         break;
3816                 } else if (memcmp(p, "PK\001\002", 4) != 0) {
3817                         archive_set_error(&a->archive,
3818                             -1, "Invalid central directory signature");
3819                         return ARCHIVE_FATAL;
3820                 }
3821                 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL)
3822                         return ARCHIVE_FATAL;
3823
3824                 zip_entry = calloc(1, sizeof(struct zip_entry));
3825                 if (zip_entry == NULL) {
3826                         archive_set_error(&a->archive, ENOMEM,
3827                                 "Can't allocate zip entry");
3828                         return ARCHIVE_FATAL;
3829                 }
3830                 zip_entry->next = zip->zip_entries;
3831                 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY;
3832                 zip->zip_entries = zip_entry;
3833                 zip->central_directory_entries_total++;
3834
3835                 /* version = p[4]; */
3836                 zip_entry->system = p[5];
3837                 /* version_required = archive_le16dec(p + 6); */
3838                 zip_entry->zip_flags = archive_le16dec(p + 8);
3839                 if (zip_entry->zip_flags
3840                       & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){
3841                         zip->has_encrypted_entries = 1;
3842                 }
3843                 zip_entry->compression = (char)archive_le16dec(p + 10);
3844                 zip_entry->mtime = zip_time(p + 12);
3845                 zip_entry->crc32 = archive_le32dec(p + 16);
3846                 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
3847                         zip_entry->decdat = p[13];
3848                 else
3849                         zip_entry->decdat = p[19];
3850                 zip_entry->compressed_size = archive_le32dec(p + 20);
3851                 zip_entry->uncompressed_size = archive_le32dec(p + 24);
3852                 filename_length = archive_le16dec(p + 28);
3853                 extra_length = archive_le16dec(p + 30);
3854                 comment_length = archive_le16dec(p + 32);
3855                 /* disk_start = archive_le16dec(p + 34);
3856                  *   Better be zero.
3857                  * internal_attributes = archive_le16dec(p + 36);
3858                  *   text bit */
3859                 external_attributes = archive_le32dec(p + 38);
3860                 zip_entry->local_header_offset =
3861                     archive_le32dec(p + 42) + correction;
3862
3863                 /* If we can't guess the mode, leave it zero here;
3864                    when we read the local file header we might get
3865                    more information. */
3866                 if (zip_entry->system == 3) {
3867                         zip_entry->mode = external_attributes >> 16;
3868                 } else if (zip_entry->system == 0) {
3869                         // Interpret MSDOS directory bit
3870                         if (0x10 == (external_attributes & 0x10)) {
3871                                 zip_entry->mode = AE_IFDIR | 0775;
3872                         } else {
3873                                 zip_entry->mode = AE_IFREG | 0664;
3874                         }
3875                         if (0x01 == (external_attributes & 0x01)) {
3876                                 // Read-only bit; strip write permissions
3877                                 zip_entry->mode &= 0555;
3878                         }
3879                 } else {
3880                         zip_entry->mode = 0;
3881                 }
3882
3883                 /* We're done with the regular data; get the filename and
3884                  * extra data. */
3885                 __archive_read_consume(a, 46);
3886                 p = __archive_read_ahead(a, filename_length + extra_length,
3887                         NULL);
3888                 if (p == NULL) {
3889                         archive_set_error(&a->archive,
3890                             ARCHIVE_ERRNO_FILE_FORMAT,
3891                             "Truncated ZIP file header");
3892                         return ARCHIVE_FATAL;
3893                 }
3894                 if (ARCHIVE_OK != process_extra(a, entry, p + filename_length,
3895                     extra_length, zip_entry)) {
3896                         return ARCHIVE_FATAL;
3897                 }
3898
3899                 /*
3900                  * Mac resource fork files are stored under the
3901                  * "__MACOSX/" directory, so we should check if
3902                  * it is.
3903                  */
3904                 if (!zip->process_mac_extensions) {
3905                         /* Treat every entry as a regular entry. */
3906                         __archive_rb_tree_insert_node(&zip->tree,
3907                             &zip_entry->node);
3908                 } else {
3909                         name = p;
3910                         r = rsrc_basename(name, filename_length);
3911                         if (filename_length >= 9 &&
3912                             strncmp("__MACOSX/", name, 9) == 0) {
3913                                 /* If this file is not a resource fork nor
3914                                  * a directory. We should treat it as a non
3915                                  * resource fork file to expose it. */
3916                                 if (name[filename_length-1] != '/' &&
3917                                     (r - name < 3 || r[0] != '.' ||
3918                                      r[1] != '_')) {
3919                                         __archive_rb_tree_insert_node(
3920                                             &zip->tree, &zip_entry->node);
3921                                         /* Expose its parent directories. */
3922                                         expose_parent_dirs(zip, name,
3923                                             filename_length);
3924                                 } else {
3925                                         /* This file is a resource fork file or
3926                                          * a directory. */
3927                                         archive_strncpy(&(zip_entry->rsrcname),
3928                                              name, filename_length);
3929                                         __archive_rb_tree_insert_node(
3930                                             &zip->tree_rsrc, &zip_entry->node);
3931                                 }
3932                         } else {
3933                                 /* Generate resource fork name to find its
3934                                  * resource file at zip->tree_rsrc. */
3935                                 archive_strcpy(&(zip_entry->rsrcname),
3936                                     "__MACOSX/");
3937                                 archive_strncat(&(zip_entry->rsrcname),
3938                                     name, r - name);
3939                                 archive_strcat(&(zip_entry->rsrcname), "._");
3940                                 archive_strncat(&(zip_entry->rsrcname),
3941                                     name + (r - name),
3942                                     filename_length - (r - name));
3943                                 /* Register an entry to RB tree to sort it by
3944                                  * file offset. */
3945                                 __archive_rb_tree_insert_node(&zip->tree,
3946                                     &zip_entry->node);
3947                         }
3948                 }
3949
3950                 /* Skip the comment too ... */
3951                 __archive_read_consume(a,
3952                     filename_length + extra_length + comment_length);
3953         }
3954
3955         return ARCHIVE_OK;
3956 }
3957
3958 static ssize_t
3959 zip_get_local_file_header_size(struct archive_read *a, size_t extra)
3960 {
3961         const char *p;
3962         ssize_t filename_length, extra_length;
3963
3964         if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) {
3965                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
3966                     "Truncated ZIP file header");
3967                 return (ARCHIVE_WARN);
3968         }
3969         p += extra;
3970
3971         if (memcmp(p, "PK\003\004", 4) != 0) {
3972                 archive_set_error(&a->archive, -1, "Damaged Zip archive");
3973                 return ARCHIVE_WARN;
3974         }
3975         filename_length = archive_le16dec(p + 26);
3976         extra_length = archive_le16dec(p + 28);
3977
3978         return (30 + filename_length + extra_length);
3979 }
3980
3981 static int
3982 zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
3983     struct zip_entry *rsrc)
3984 {
3985         struct zip *zip = (struct zip *)a->format->data;
3986         unsigned char *metadata, *mp;
3987         int64_t offset = archive_filter_bytes(&a->archive, 0);
3988         size_t remaining_bytes, metadata_bytes;
3989         ssize_t hsize;
3990         int ret = ARCHIVE_OK, eof;
3991
3992         switch(rsrc->compression) {
3993         case 0:  /* No compression. */
3994                 if (rsrc->uncompressed_size != rsrc->compressed_size) {
3995                         archive_set_error(&a->archive,
3996                             ARCHIVE_ERRNO_FILE_FORMAT,
3997                             "Malformed OS X metadata entry: "
3998                             "inconsistent size");
3999                         return (ARCHIVE_FATAL);
4000                 }
4001 #ifdef HAVE_ZLIB_H
4002         case 8: /* Deflate compression. */
4003 #endif
4004                 break;
4005         default: /* Unsupported compression. */
4006                 /* Return a warning. */
4007                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
4008                     "Unsupported ZIP compression method (%s)",
4009                     compression_name(rsrc->compression));
4010                 /* We can't decompress this entry, but we will
4011                  * be able to skip() it and try the next entry. */
4012                 return (ARCHIVE_WARN);
4013         }
4014
4015         if (rsrc->uncompressed_size > (4 * 1024 * 1024)) {
4016                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
4017                     "Mac metadata is too large: %jd > 4M bytes",
4018                     (intmax_t)rsrc->uncompressed_size);
4019                 return (ARCHIVE_WARN);
4020         }
4021         if (rsrc->compressed_size > (4 * 1024 * 1024)) {
4022                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
4023                     "Mac metadata is too large: %jd > 4M bytes",
4024                     (intmax_t)rsrc->compressed_size);
4025                 return (ARCHIVE_WARN);
4026         }
4027
4028         metadata = malloc((size_t)rsrc->uncompressed_size);
4029         if (metadata == NULL) {
4030                 archive_set_error(&a->archive, ENOMEM,
4031                     "Can't allocate memory for Mac metadata");
4032                 return (ARCHIVE_FATAL);
4033         }
4034
4035         if (offset < rsrc->local_header_offset)
4036                 __archive_read_consume(a, rsrc->local_header_offset - offset);
4037         else if (offset != rsrc->local_header_offset) {
4038                 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET);
4039         }
4040
4041         hsize = zip_get_local_file_header_size(a, 0);
4042         __archive_read_consume(a, hsize);
4043
4044         remaining_bytes = (size_t)rsrc->compressed_size;
4045         metadata_bytes = (size_t)rsrc->uncompressed_size;
4046         mp = metadata;
4047         eof = 0;
4048         while (!eof && remaining_bytes) {
4049                 const unsigned char *p;
4050                 ssize_t bytes_avail;
4051                 size_t bytes_used;
4052
4053                 p = __archive_read_ahead(a, 1, &bytes_avail);
4054                 if (p == NULL) {
4055                         archive_set_error(&a->archive,
4056                             ARCHIVE_ERRNO_FILE_FORMAT,
4057                             "Truncated ZIP file header");
4058                         ret = ARCHIVE_WARN;
4059                         goto exit_mac_metadata;
4060                 }
4061                 if ((size_t)bytes_avail > remaining_bytes)
4062                         bytes_avail = remaining_bytes;
4063                 switch(rsrc->compression) {
4064                 case 0:  /* No compression. */
4065                         if ((size_t)bytes_avail > metadata_bytes)
4066                                 bytes_avail = metadata_bytes;
4067                         memcpy(mp, p, bytes_avail);
4068                         bytes_used = (size_t)bytes_avail;
4069                         metadata_bytes -= bytes_used;
4070                         mp += bytes_used;
4071                         if (metadata_bytes == 0)
4072                                 eof = 1;
4073                         break;
4074 #ifdef HAVE_ZLIB_H
4075                 case 8: /* Deflate compression. */
4076                 {
4077                         int r;
4078
4079                         ret = zip_deflate_init(a, zip);
4080                         if (ret != ARCHIVE_OK)
4081                                 goto exit_mac_metadata;
4082                         zip->stream.next_in =
4083                             (Bytef *)(uintptr_t)(const void *)p;
4084                         zip->stream.avail_in = (uInt)bytes_avail;
4085                         zip->stream.total_in = 0;
4086                         zip->stream.next_out = mp;
4087                         zip->stream.avail_out = (uInt)metadata_bytes;
4088                         zip->stream.total_out = 0;
4089
4090                         r = inflate(&zip->stream, 0);
4091                         switch (r) {
4092                         case Z_OK:
4093                                 break;
4094                         case Z_STREAM_END:
4095                                 eof = 1;
4096                                 break;
4097                         case Z_MEM_ERROR:
4098                                 archive_set_error(&a->archive, ENOMEM,
4099                                     "Out of memory for ZIP decompression");
4100                                 ret = ARCHIVE_FATAL;
4101                                 goto exit_mac_metadata;
4102                         default:
4103                                 archive_set_error(&a->archive,
4104                                     ARCHIVE_ERRNO_MISC,
4105                                     "ZIP decompression failed (%d)", r);
4106                                 ret = ARCHIVE_FATAL;
4107                                 goto exit_mac_metadata;
4108                         }
4109                         bytes_used = zip->stream.total_in;
4110                         metadata_bytes -= zip->stream.total_out;
4111                         mp += zip->stream.total_out;
4112                         break;
4113                 }
4114 #endif
4115                 default:
4116                         bytes_used = 0;
4117                         break;
4118                 }
4119                 __archive_read_consume(a, bytes_used);
4120                 remaining_bytes -= bytes_used;
4121         }
4122         archive_entry_copy_mac_metadata(entry, metadata,
4123             (size_t)rsrc->uncompressed_size - metadata_bytes);
4124
4125 exit_mac_metadata:
4126         __archive_read_seek(a, offset, SEEK_SET);
4127         zip->decompress_init = 0;
4128         free(metadata);
4129         return (ret);
4130 }
4131
4132 static int
4133 archive_read_format_zip_seekable_read_header(struct archive_read *a,
4134         struct archive_entry *entry)
4135 {
4136         struct zip *zip = (struct zip *)a->format->data;
4137         struct zip_entry *rsrc;
4138         int64_t offset;
4139         int r, ret = ARCHIVE_OK;
4140
4141         /*
4142          * It should be sufficient to call archive_read_next_header() for
4143          * a reader to determine if an entry is encrypted or not. If the
4144          * encryption of an entry is only detectable when calling
4145          * archive_read_data(), so be it. We'll do the same check there
4146          * as well.
4147          */
4148         if (zip->has_encrypted_entries ==
4149                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
4150                 zip->has_encrypted_entries = 0;
4151
4152         a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
4153         if (a->archive.archive_format_name == NULL)
4154                 a->archive.archive_format_name = "ZIP";
4155
4156         if (zip->zip_entries == NULL) {
4157                 r = slurp_central_directory(a, entry, zip);
4158                 if (r != ARCHIVE_OK)
4159                         return r;
4160                 /* Get first entry whose local header offset is lower than
4161                  * other entries in the archive file. */
4162                 zip->entry =
4163                     (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree);
4164         } else if (zip->entry != NULL) {
4165                 /* Get next entry in local header offset order. */
4166                 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate(
4167                     &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT);
4168         }
4169
4170         if (zip->entry == NULL)
4171                 return ARCHIVE_EOF;
4172
4173         if (zip->entry->rsrcname.s)
4174                 rsrc = (struct zip_entry *)__archive_rb_tree_find_node(
4175                     &zip->tree_rsrc, zip->entry->rsrcname.s);
4176         else
4177                 rsrc = NULL;
4178
4179         if (zip->cctx_valid)
4180                 archive_decrypto_aes_ctr_release(&zip->cctx);
4181         if (zip->hctx_valid)
4182                 archive_hmac_sha1_cleanup(&zip->hctx);
4183         zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
4184         __archive_read_reset_passphrase(a);
4185
4186         /* File entries are sorted by the header offset, we should mostly
4187          * use __archive_read_consume to advance a read point to avoid
4188          * redundant data reading.  */
4189         offset = archive_filter_bytes(&a->archive, 0);
4190         if (offset < zip->entry->local_header_offset)
4191                 __archive_read_consume(a,
4192                     zip->entry->local_header_offset - offset);
4193         else if (offset != zip->entry->local_header_offset) {
4194                 __archive_read_seek(a, zip->entry->local_header_offset,
4195                     SEEK_SET);
4196         }
4197         zip->unconsumed = 0;
4198         r = zip_read_local_file_header(a, entry, zip);
4199         if (r != ARCHIVE_OK)
4200                 return r;
4201         if (rsrc) {
4202                 int ret2 = zip_read_mac_metadata(a, entry, rsrc);
4203                 if (ret2 < ret)
4204                         ret = ret2;
4205         }
4206         return (ret);
4207 }
4208
4209 /*
4210  * We're going to seek for the next header anyway, so we don't
4211  * need to bother doing anything here.
4212  */
4213 static int
4214 archive_read_format_zip_read_data_skip_seekable(struct archive_read *a)
4215 {
4216         struct zip *zip;
4217         zip = (struct zip *)(a->format->data);
4218
4219         zip->unconsumed = 0;
4220         return (ARCHIVE_OK);
4221 }
4222
4223 int
4224 archive_read_support_format_zip_seekable(struct archive *_a)
4225 {
4226         struct archive_read *a = (struct archive_read *)_a;
4227         struct zip *zip;
4228         int r;
4229
4230         archive_check_magic(_a, ARCHIVE_READ_MAGIC,
4231             ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable");
4232
4233         zip = (struct zip *)calloc(1, sizeof(*zip));
4234         if (zip == NULL) {
4235                 archive_set_error(&a->archive, ENOMEM,
4236                     "Can't allocate zip data");
4237                 return (ARCHIVE_FATAL);
4238         }
4239
4240 #ifdef HAVE_COPYFILE_H
4241         /* Set this by default on Mac OS. */
4242         zip->process_mac_extensions = 1;
4243 #endif
4244
4245         /*
4246          * Until enough data has been read, we cannot tell about
4247          * any encrypted entries yet.
4248          */
4249         zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
4250         zip->crc32func = real_crc32;
4251
4252         r = __archive_read_register_format(a,
4253             zip,
4254             "zip",
4255             archive_read_format_zip_seekable_bid,
4256             archive_read_format_zip_options,
4257             archive_read_format_zip_seekable_read_header,
4258             archive_read_format_zip_read_data,
4259             archive_read_format_zip_read_data_skip_seekable,
4260             NULL,
4261             archive_read_format_zip_cleanup,
4262             archive_read_support_format_zip_capabilities_seekable,
4263             archive_read_format_zip_has_encrypted_entries);
4264
4265         if (r != ARCHIVE_OK)
4266                 free(zip);
4267         return (ARCHIVE_OK);
4268 }
4269
4270 /*# vim:set noet:*/