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