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 techincally 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 regularfile. */
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, it's 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                 case LZMA_OK:
1801                         break;
1802
1803                 default:
1804                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1805                             "lzma unknown error %d", (int) lz_ret);
1806                         return (ARCHIVE_FATAL);
1807         }
1808
1809         to_consume = zip->zipx_lzma_stream.total_in;
1810
1811         /* Update pointers. */
1812         __archive_read_consume(a, to_consume);
1813         zip->entry_bytes_remaining -= to_consume;
1814         zip->entry_compressed_bytes_read += to_consume;
1815         zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out;
1816
1817         if(zip->entry_bytes_remaining == 0) {
1818                 zip->end_of_entry = 1;
1819         }
1820
1821         /* Return values. */
1822         *size = zip->zipx_lzma_stream.total_out;
1823         *buff = zip->uncompressed_buffer;
1824
1825         /* Behave the same way as during deflate decompression. */
1826         ret = consume_optional_marker(a, zip);
1827         if (ret != ARCHIVE_OK)
1828                 return (ret);
1829
1830         /* Free lzma decoder handle because we'll no longer need it. */
1831         if(zip->end_of_entry) {
1832                 lzma_end(&zip->zipx_lzma_stream);
1833                 zip->zipx_lzma_valid = 0;
1834         }
1835
1836         /* If we're here, then we're good! */
1837         return (ARCHIVE_OK);
1838 }
1839 #endif /* HAVE_LZMA_H && HAVE_LIBLZMA */
1840
1841 static int
1842 zipx_ppmd8_init(struct archive_read *a, struct zip *zip)
1843 {
1844         const void* p;
1845         uint32_t val;
1846         uint32_t order;
1847         uint32_t mem;
1848         uint32_t restore_method;
1849
1850         /* Remove previous decompression context if it exists. */
1851         if(zip->ppmd8_valid) {
1852                 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8);
1853                 zip->ppmd8_valid = 0;
1854         }
1855
1856         /* Create a new decompression context. */
1857         __archive_ppmd8_functions.Ppmd8_Construct(&zip->ppmd8);
1858         zip->ppmd8_stream_failed = 0;
1859
1860         /* Setup function pointers required by Ppmd8 decompressor. The
1861          * 'ppmd_read' function will feed new bytes to the decompressor,
1862          * and will increment the 'zip->zipx_ppmd_read_compressed' counter. */
1863         zip->ppmd8.Stream.In = &zip->zipx_ppmd_stream;
1864         zip->zipx_ppmd_stream.a = a;
1865         zip->zipx_ppmd_stream.Read = &ppmd_read;
1866
1867         /* Reset number of read bytes to 0. */
1868         zip->zipx_ppmd_read_compressed = 0;
1869
1870         /* Read Ppmd8 header (2 bytes). */
1871         p = __archive_read_ahead(a, 2, NULL);
1872         if(!p) {
1873                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1874                     "Truncated file data in PPMd8 stream");
1875                 return (ARCHIVE_FATAL);
1876         }
1877         __archive_read_consume(a, 2);
1878
1879         /* Decode the stream's compression parameters. */
1880         val = archive_le16dec(p);
1881         order = (val & 15) + 1;
1882         mem = ((val >> 4) & 0xff) + 1;
1883         restore_method = (val >> 12);
1884
1885         if(order < 2 || restore_method > 2) {
1886                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1887                     "Invalid parameter set in PPMd8 stream (order=%d, "
1888                     "restore=%d)", order, restore_method);
1889                 return (ARCHIVE_FAILED);
1890         }
1891
1892         /* Allocate the memory needed to properly decompress the file. */
1893         if(!__archive_ppmd8_functions.Ppmd8_Alloc(&zip->ppmd8, mem << 20)) {
1894                 archive_set_error(&a->archive, ENOMEM,
1895                     "Unable to allocate memory for PPMd8 stream: %d bytes",
1896                     mem << 20);
1897                 return (ARCHIVE_FATAL);
1898         }
1899
1900         /* Signal the cleanup function to release Ppmd8 context in the
1901          * cleanup phase. */
1902         zip->ppmd8_valid = 1;
1903
1904         /* Perform further Ppmd8 initialization. */
1905         if(!__archive_ppmd8_functions.Ppmd8_RangeDec_Init(&zip->ppmd8)) {
1906                 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
1907                     "PPMd8 stream range decoder initialization error");
1908                 return (ARCHIVE_FATAL);
1909         }
1910
1911         __archive_ppmd8_functions.Ppmd8_Init(&zip->ppmd8, order,
1912             restore_method);
1913
1914         /* Allocate the buffer that will hold uncompressed data. */
1915         free(zip->uncompressed_buffer);
1916
1917         zip->uncompressed_buffer_size = 256 * 1024;
1918         zip->uncompressed_buffer =
1919             (uint8_t*) malloc(zip->uncompressed_buffer_size);
1920
1921         if(zip->uncompressed_buffer == NULL) {
1922                 archive_set_error(&a->archive, ENOMEM,
1923                     "No memory for PPMd8 decompression");
1924                 return ARCHIVE_FATAL;
1925         }
1926
1927         /* Ppmd8 initialization is done. */
1928         zip->decompress_init = 1;
1929
1930         /* We've already read 2 bytes in the output stream. Additionally,
1931          * Ppmd8 initialization code could read some data as well. So we
1932          * are advancing the stream by 2 bytes plus whatever number of
1933          * bytes Ppmd8 init function used. */
1934         zip->entry_compressed_bytes_read += 2 + zip->zipx_ppmd_read_compressed;
1935
1936         return ARCHIVE_OK;
1937 }
1938
1939 static int
1940 zip_read_data_zipx_ppmd(struct archive_read *a, const void **buff,
1941     size_t *size, int64_t *offset)
1942 {
1943         struct zip* zip = (struct zip *)(a->format->data);
1944         int ret;
1945         size_t consumed_bytes = 0;
1946         ssize_t bytes_avail = 0;
1947
1948         (void) offset; /* UNUSED */
1949
1950         /* If we're here for the first time, initialize Ppmd8 decompression
1951          * context first. */
1952         if(!zip->decompress_init) {
1953                 ret = zipx_ppmd8_init(a, zip);
1954                 if(ret != ARCHIVE_OK)
1955                         return ret;
1956         }
1957
1958         /* Fetch for more data. We're reading 1 byte here, but libarchive
1959          * should prefetch more bytes. */
1960         (void) __archive_read_ahead(a, 1, &bytes_avail);
1961         if(bytes_avail < 0) {
1962                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1963                     "Truncated PPMd8 file body");
1964                 return (ARCHIVE_FATAL);
1965         }
1966
1967         /* This counter will be updated inside ppmd_read(), which at one
1968          * point will be called by Ppmd8_DecodeSymbol. */
1969         zip->zipx_ppmd_read_compressed = 0;
1970
1971         /* Decompression loop. */
1972         do {
1973                 int sym = __archive_ppmd8_functions.Ppmd8_DecodeSymbol(
1974                     &zip->ppmd8);
1975                 if(sym < 0) {
1976                         zip->end_of_entry = 1;
1977                         break;
1978                 }
1979
1980                 /* This field is set by ppmd_read() when there was no more data
1981                  * to be read. */
1982                 if(zip->ppmd8_stream_failed) {
1983                         archive_set_error(&a->archive,
1984                             ARCHIVE_ERRNO_FILE_FORMAT,
1985                             "Truncated PPMd8 file body");
1986                         return (ARCHIVE_FATAL);
1987                 }
1988
1989                 zip->uncompressed_buffer[consumed_bytes] = (uint8_t) sym;
1990                 ++consumed_bytes;
1991         } while(consumed_bytes < zip->uncompressed_buffer_size);
1992
1993         /* Update pointers for libarchive. */
1994         *buff = zip->uncompressed_buffer;
1995         *size = consumed_bytes;
1996
1997         /* Update pointers so we can continue decompression in another call. */
1998         zip->entry_bytes_remaining -= zip->zipx_ppmd_read_compressed;
1999         zip->entry_compressed_bytes_read += zip->zipx_ppmd_read_compressed;
2000         zip->entry_uncompressed_bytes_read += consumed_bytes;
2001
2002         /* If we're at the end of stream, deinitialize Ppmd8 context. */
2003         if(zip->end_of_entry) {
2004                 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8);
2005                 zip->ppmd8_valid = 0;
2006         }
2007
2008         /* Seek for optional marker, same way as in each zip entry. */
2009         ret = consume_optional_marker(a, zip);
2010         if (ret != ARCHIVE_OK)
2011                 return ret;
2012
2013         return ARCHIVE_OK;
2014 }
2015
2016 #ifdef HAVE_BZLIB_H
2017 static int
2018 zipx_bzip2_init(struct archive_read *a, struct zip *zip)
2019 {
2020         int r;
2021
2022         /* Deallocate already existing BZ2 decompression context if it
2023          * exists. */
2024         if(zip->bzstream_valid) {
2025                 BZ2_bzDecompressEnd(&zip->bzstream);
2026                 zip->bzstream_valid = 0;
2027         }
2028
2029         /* Allocate a new BZ2 decompression context. */
2030         memset(&zip->bzstream, 0, sizeof(bz_stream));
2031         r = BZ2_bzDecompressInit(&zip->bzstream, 0, 1);
2032         if(r != BZ_OK) {
2033                 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC,
2034                     "bzip2 initialization failed(%d)",
2035                     r);
2036
2037                 return ARCHIVE_FAILED;
2038         }
2039
2040         /* Mark the bzstream field to be released in cleanup phase. */
2041         zip->bzstream_valid = 1;
2042
2043         /* (Re)allocate the buffer that will contain decompressed bytes. */
2044         free(zip->uncompressed_buffer);
2045
2046         zip->uncompressed_buffer_size = 256 * 1024;
2047         zip->uncompressed_buffer =
2048             (uint8_t*) malloc(zip->uncompressed_buffer_size);
2049         if (zip->uncompressed_buffer == NULL) {
2050                 archive_set_error(&a->archive, ENOMEM,
2051                     "No memory for bzip2 decompression");
2052                     return ARCHIVE_FATAL;
2053         }
2054
2055         /* Initialization done. */
2056         zip->decompress_init = 1;
2057         return ARCHIVE_OK;
2058 }
2059
2060 static int
2061 zip_read_data_zipx_bzip2(struct archive_read *a, const void **buff,
2062     size_t *size, int64_t *offset)
2063 {
2064         struct zip *zip = (struct zip *)(a->format->data);
2065         ssize_t bytes_avail = 0, in_bytes, to_consume;
2066         const void *compressed_buff;
2067         int r;
2068         uint64_t total_out;
2069
2070         (void) offset; /* UNUSED */
2071
2072         /* Initialize decompression context if we're here for the first time. */
2073         if(!zip->decompress_init) {
2074                 r = zipx_bzip2_init(a, zip);
2075                 if(r != ARCHIVE_OK)
2076                         return r;
2077         }
2078
2079         /* Fetch more compressed bytes. */
2080         compressed_buff = __archive_read_ahead(a, 1, &bytes_avail);
2081         if(bytes_avail < 0) {
2082                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2083                     "Truncated bzip2 file body");
2084                 return (ARCHIVE_FATAL);
2085         }
2086
2087         in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail);
2088         if(in_bytes < 1) {
2089                 /* libbz2 doesn't complain when caller feeds avail_in == 0.
2090                  * It will actually return success in this case, which is
2091                  * undesirable. This is why we need to make this check
2092                  * manually. */
2093
2094                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2095                     "Truncated bzip2 file body");
2096                 return (ARCHIVE_FATAL);
2097         }
2098
2099         /* Setup buffer boundaries. */
2100         zip->bzstream.next_in = (char*)(uintptr_t) compressed_buff;
2101         zip->bzstream.avail_in = in_bytes;
2102         zip->bzstream.total_in_hi32 = 0;
2103         zip->bzstream.total_in_lo32 = 0;
2104         zip->bzstream.next_out = (char*) zip->uncompressed_buffer;
2105         zip->bzstream.avail_out = zip->uncompressed_buffer_size;
2106         zip->bzstream.total_out_hi32 = 0;
2107         zip->bzstream.total_out_lo32 = 0;
2108
2109         /* Perform the decompression. */
2110         r = BZ2_bzDecompress(&zip->bzstream);
2111         switch(r) {
2112                 case BZ_STREAM_END:
2113                         /* If we're at the end of the stream, deinitialize the
2114                          * decompression context now. */
2115                         switch(BZ2_bzDecompressEnd(&zip->bzstream)) {
2116                                 case BZ_OK:
2117                                         break;
2118                                 default:
2119                                         archive_set_error(&a->archive,
2120                                             ARCHIVE_ERRNO_MISC,
2121                                             "Failed to clean up bzip2 "
2122                                             "decompressor");
2123                                         return ARCHIVE_FATAL;
2124                         }
2125
2126                         zip->end_of_entry = 1;
2127                         break;
2128                 case BZ_OK:
2129                         /* The decompressor has successfully decoded this
2130                          * chunk of data, but more data is still in queue. */
2131                         break;
2132                 default:
2133                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2134                             "bzip2 decompression failed");
2135                         return ARCHIVE_FATAL;
2136         }
2137
2138         /* Update the pointers so decompressor can continue decoding. */
2139         to_consume = zip->bzstream.total_in_lo32;
2140         __archive_read_consume(a, to_consume);
2141
2142         total_out = ((uint64_t) zip->bzstream.total_out_hi32 << 32) +
2143             zip->bzstream.total_out_lo32;
2144
2145         zip->entry_bytes_remaining -= to_consume;
2146         zip->entry_compressed_bytes_read += to_consume;
2147         zip->entry_uncompressed_bytes_read += total_out;
2148
2149         /* Give libarchive its due. */
2150         *size = total_out;
2151         *buff = zip->uncompressed_buffer;
2152
2153         /* Seek for optional marker, like in other entries. */
2154         r = consume_optional_marker(a, zip);
2155         if(r != ARCHIVE_OK)
2156                 return r;
2157
2158         return ARCHIVE_OK;
2159 }
2160
2161 #endif
2162
2163 #ifdef HAVE_ZLIB_H
2164 static int
2165 zip_deflate_init(struct archive_read *a, struct zip *zip)
2166 {
2167         int r;
2168
2169         /* If we haven't yet read any data, initialize the decompressor. */
2170         if (!zip->decompress_init) {
2171                 if (zip->stream_valid)
2172                         r = inflateReset(&zip->stream);
2173                 else
2174                         r = inflateInit2(&zip->stream,
2175                             -15 /* Don't check for zlib header */);
2176                 if (r != Z_OK) {
2177                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2178                             "Can't initialize ZIP decompression.");
2179                         return (ARCHIVE_FATAL);
2180                 }
2181                 /* Stream structure has been set up. */
2182                 zip->stream_valid = 1;
2183                 /* We've initialized decompression for this stream. */
2184                 zip->decompress_init = 1;
2185         }
2186         return (ARCHIVE_OK);
2187 }
2188
2189 static int
2190 zip_read_data_deflate(struct archive_read *a, const void **buff,
2191     size_t *size, int64_t *offset)
2192 {
2193         struct zip *zip;
2194         ssize_t bytes_avail;
2195         const void *compressed_buff, *sp;
2196         int r;
2197
2198         (void)offset; /* UNUSED */
2199
2200         zip = (struct zip *)(a->format->data);
2201
2202         /* If the buffer hasn't been allocated, allocate it now. */
2203         if (zip->uncompressed_buffer == NULL) {
2204                 zip->uncompressed_buffer_size = 256 * 1024;
2205                 zip->uncompressed_buffer
2206                     = (unsigned char *)malloc(zip->uncompressed_buffer_size);
2207                 if (zip->uncompressed_buffer == NULL) {
2208                         archive_set_error(&a->archive, ENOMEM,
2209                             "No memory for ZIP decompression");
2210                         return (ARCHIVE_FATAL);
2211                 }
2212         }
2213
2214         r = zip_deflate_init(a, zip);
2215         if (r != ARCHIVE_OK)
2216                 return (r);
2217
2218         /*
2219          * Note: '1' here is a performance optimization.
2220          * Recall that the decompression layer returns a count of
2221          * available bytes; asking for more than that forces the
2222          * decompressor to combine reads by copying data.
2223          */
2224         compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail);
2225         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2226             && bytes_avail > zip->entry_bytes_remaining) {
2227                 bytes_avail = (ssize_t)zip->entry_bytes_remaining;
2228         }
2229         if (bytes_avail < 0) {
2230                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2231                     "Truncated ZIP file body");
2232                 return (ARCHIVE_FATAL);
2233         }
2234
2235         if (zip->tctx_valid || zip->cctx_valid) {
2236                 if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) {
2237                         size_t buff_remaining =
2238                             (zip->decrypted_buffer +
2239                             zip->decrypted_buffer_size)
2240                             - (zip->decrypted_ptr +
2241                             zip->decrypted_bytes_remaining);
2242
2243                         if (buff_remaining > (size_t)bytes_avail)
2244                                 buff_remaining = (size_t)bytes_avail;
2245
2246                         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) &&
2247                               zip->entry_bytes_remaining > 0) {
2248                                 if ((int64_t)(zip->decrypted_bytes_remaining
2249                                     + buff_remaining)
2250                                       > zip->entry_bytes_remaining) {
2251                                         if (zip->entry_bytes_remaining <
2252                                             (int64_t)zip->decrypted_bytes_remaining)
2253                                                 buff_remaining = 0;
2254                                         else
2255                                                 buff_remaining =
2256                                                     (size_t)zip->entry_bytes_remaining
2257                                                     - zip->decrypted_bytes_remaining;
2258                                 }
2259                         }
2260                         if (buff_remaining > 0) {
2261                                 if (zip->tctx_valid) {
2262                                         trad_enc_decrypt_update(&zip->tctx,
2263                                             compressed_buff, buff_remaining,
2264                                             zip->decrypted_ptr
2265                                               + zip->decrypted_bytes_remaining,
2266                                             buff_remaining);
2267                                 } else {
2268                                         size_t dsize = buff_remaining;
2269                                         archive_decrypto_aes_ctr_update(
2270                                             &zip->cctx,
2271                                             compressed_buff, buff_remaining,
2272                                             zip->decrypted_ptr
2273                                               + zip->decrypted_bytes_remaining,
2274                                             &dsize);
2275                                 }
2276                                 zip->decrypted_bytes_remaining +=
2277                                     buff_remaining;
2278                         }
2279                 }
2280                 bytes_avail = zip->decrypted_bytes_remaining;
2281                 compressed_buff = (const char *)zip->decrypted_ptr;
2282         }
2283
2284         /*
2285          * A bug in zlib.h: stream.next_in should be marked 'const'
2286          * but isn't (the library never alters data through the
2287          * next_in pointer, only reads it).  The result: this ugly
2288          * cast to remove 'const'.
2289          */
2290         zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff;
2291         zip->stream.avail_in = (uInt)bytes_avail;
2292         zip->stream.total_in = 0;
2293         zip->stream.next_out = zip->uncompressed_buffer;
2294         zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size;
2295         zip->stream.total_out = 0;
2296
2297         r = inflate(&zip->stream, 0);
2298         switch (r) {
2299         case Z_OK:
2300                 break;
2301         case Z_STREAM_END:
2302                 zip->end_of_entry = 1;
2303                 break;
2304         case Z_MEM_ERROR:
2305                 archive_set_error(&a->archive, ENOMEM,
2306                     "Out of memory for ZIP decompression");
2307                 return (ARCHIVE_FATAL);
2308         default:
2309                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2310                     "ZIP decompression failed (%d)", r);
2311                 return (ARCHIVE_FATAL);
2312         }
2313
2314         /* Consume as much as the compressor actually used. */
2315         bytes_avail = zip->stream.total_in;
2316         if (zip->tctx_valid || zip->cctx_valid) {
2317                 zip->decrypted_bytes_remaining -= bytes_avail;
2318                 if (zip->decrypted_bytes_remaining == 0)
2319                         zip->decrypted_ptr = zip->decrypted_buffer;
2320                 else
2321                         zip->decrypted_ptr += bytes_avail;
2322         }
2323         /* Calculate compressed data as much as we used.*/
2324         if (zip->hctx_valid)
2325                 archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail);
2326         __archive_read_consume(a, bytes_avail);
2327         zip->entry_bytes_remaining -= bytes_avail;
2328         zip->entry_compressed_bytes_read += bytes_avail;
2329
2330         *size = zip->stream.total_out;
2331         zip->entry_uncompressed_bytes_read += zip->stream.total_out;
2332         *buff = zip->uncompressed_buffer;
2333
2334         if (zip->end_of_entry && zip->hctx_valid) {
2335                 r = check_authentication_code(a, NULL);
2336                 if (r != ARCHIVE_OK)
2337                         return (r);
2338         }
2339
2340         r = consume_optional_marker(a, zip);
2341         if (r != ARCHIVE_OK)
2342                 return (r);
2343
2344         return (ARCHIVE_OK);
2345 }
2346 #endif
2347
2348 static int
2349 read_decryption_header(struct archive_read *a)
2350 {
2351         struct zip *zip = (struct zip *)(a->format->data);
2352         const char *p;
2353         unsigned int remaining_size;
2354         unsigned int ts;
2355
2356         /*
2357          * Read an initialization vector data field.
2358          */
2359         p = __archive_read_ahead(a, 2, NULL);
2360         if (p == NULL)
2361                 goto truncated;
2362         ts = zip->iv_size;
2363         zip->iv_size = archive_le16dec(p);
2364         __archive_read_consume(a, 2);
2365         if (ts < zip->iv_size) {
2366                 free(zip->iv);
2367                 zip->iv = NULL;
2368         }
2369         p = __archive_read_ahead(a, zip->iv_size, NULL);
2370         if (p == NULL)
2371                 goto truncated;
2372         if (zip->iv == NULL) {
2373                 zip->iv = malloc(zip->iv_size);
2374                 if (zip->iv == NULL)
2375                         goto nomem;
2376         }
2377         memcpy(zip->iv, p, zip->iv_size);
2378         __archive_read_consume(a, zip->iv_size);
2379
2380         /*
2381          * Read a size of remaining decryption header field.
2382          */
2383         p = __archive_read_ahead(a, 14, NULL);
2384         if (p == NULL)
2385                 goto truncated;
2386         remaining_size = archive_le32dec(p);
2387         if (remaining_size < 16 || remaining_size > (1 << 18))
2388                 goto corrupted;
2389
2390         /* Check if format version is supported. */
2391         if (archive_le16dec(p+4) != 3) {
2392                 archive_set_error(&a->archive,
2393                     ARCHIVE_ERRNO_FILE_FORMAT,
2394                     "Unsupported encryption format version: %u",
2395                     archive_le16dec(p+4));
2396                 return (ARCHIVE_FAILED);
2397         }
2398
2399         /*
2400          * Read an encryption algorithm field.
2401          */
2402         zip->alg_id = archive_le16dec(p+6);
2403         switch (zip->alg_id) {
2404         case 0x6601:/* DES */
2405         case 0x6602:/* RC2 */
2406         case 0x6603:/* 3DES 168 */
2407         case 0x6609:/* 3DES 112 */
2408         case 0x660E:/* AES 128 */
2409         case 0x660F:/* AES 192 */
2410         case 0x6610:/* AES 256 */
2411         case 0x6702:/* RC2 (version >= 5.2) */
2412         case 0x6720:/* Blowfish */
2413         case 0x6721:/* Twofish */
2414         case 0x6801:/* RC4 */
2415                 /* Supported encryption algorithm. */
2416                 break;
2417         default:
2418                 archive_set_error(&a->archive,
2419                     ARCHIVE_ERRNO_FILE_FORMAT,
2420                     "Unknown encryption algorithm: %u", zip->alg_id);
2421                 return (ARCHIVE_FAILED);
2422         }
2423
2424         /*
2425          * Read a bit length field.
2426          */
2427         zip->bit_len = archive_le16dec(p+8);
2428
2429         /*
2430          * Read a flags field.
2431          */
2432         zip->flags = archive_le16dec(p+10);
2433         switch (zip->flags & 0xf000) {
2434         case 0x0001: /* Password is required to decrypt. */
2435         case 0x0002: /* Certificates only. */
2436         case 0x0003: /* Password or certificate required to decrypt. */
2437                 break;
2438         default:
2439                 archive_set_error(&a->archive,
2440                     ARCHIVE_ERRNO_FILE_FORMAT,
2441                     "Unknown encryption flag: %u", zip->flags);
2442                 return (ARCHIVE_FAILED);
2443         }
2444         if ((zip->flags & 0xf000) == 0 ||
2445             (zip->flags & 0xf000) == 0x4000) {
2446                 archive_set_error(&a->archive,
2447                     ARCHIVE_ERRNO_FILE_FORMAT,
2448                     "Unknown encryption flag: %u", zip->flags);
2449                 return (ARCHIVE_FAILED);
2450         }
2451
2452         /*
2453          * Read an encrypted random data field.
2454          */
2455         ts = zip->erd_size;
2456         zip->erd_size = archive_le16dec(p+12);
2457         __archive_read_consume(a, 14);
2458         if ((zip->erd_size & 0xf) != 0 ||
2459             (zip->erd_size + 16) > remaining_size ||
2460             (zip->erd_size + 16) < zip->erd_size)
2461                 goto corrupted;
2462
2463         if (ts < zip->erd_size) {
2464                 free(zip->erd);
2465                 zip->erd = NULL;
2466         }
2467         p = __archive_read_ahead(a, zip->erd_size, NULL);
2468         if (p == NULL)
2469                 goto truncated;
2470         if (zip->erd == NULL) {
2471                 zip->erd = malloc(zip->erd_size);
2472                 if (zip->erd == NULL)
2473                         goto nomem;
2474         }
2475         memcpy(zip->erd, p, zip->erd_size);
2476         __archive_read_consume(a, zip->erd_size);
2477
2478         /*
2479          * Read a reserved data field.
2480          */
2481         p = __archive_read_ahead(a, 4, NULL);
2482         if (p == NULL)
2483                 goto truncated;
2484         /* Reserved data size should be zero. */
2485         if (archive_le32dec(p) != 0)
2486                 goto corrupted;
2487         __archive_read_consume(a, 4);
2488
2489         /*
2490          * Read a password validation data field.
2491          */
2492         p = __archive_read_ahead(a, 2, NULL);
2493         if (p == NULL)
2494                 goto truncated;
2495         ts = zip->v_size;
2496         zip->v_size = archive_le16dec(p);
2497         __archive_read_consume(a, 2);
2498         if ((zip->v_size & 0x0f) != 0 ||
2499             (zip->erd_size + zip->v_size + 16) > remaining_size ||
2500             (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size))
2501                 goto corrupted;
2502         if (ts < zip->v_size) {
2503                 free(zip->v_data);
2504                 zip->v_data = NULL;
2505         }
2506         p = __archive_read_ahead(a, zip->v_size, NULL);
2507         if (p == NULL)
2508                 goto truncated;
2509         if (zip->v_data == NULL) {
2510                 zip->v_data = malloc(zip->v_size);
2511                 if (zip->v_data == NULL)
2512                         goto nomem;
2513         }
2514         memcpy(zip->v_data, p, zip->v_size);
2515         __archive_read_consume(a, zip->v_size);
2516
2517         p = __archive_read_ahead(a, 4, NULL);
2518         if (p == NULL)
2519                 goto truncated;
2520         zip->v_crc32 = archive_le32dec(p);
2521         __archive_read_consume(a, 4);
2522
2523         /*return (ARCHIVE_OK);
2524          * This is not fully implemented yet.*/
2525         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2526             "Encrypted file is unsupported");
2527         return (ARCHIVE_FAILED);
2528 truncated:
2529         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2530             "Truncated ZIP file data");
2531         return (ARCHIVE_FATAL);
2532 corrupted:
2533         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2534             "Corrupted ZIP file data");
2535         return (ARCHIVE_FATAL);
2536 nomem:
2537         archive_set_error(&a->archive, ENOMEM,
2538             "No memory for ZIP decryption");
2539         return (ARCHIVE_FATAL);
2540 }
2541
2542 static int
2543 zip_alloc_decryption_buffer(struct archive_read *a)
2544 {
2545         struct zip *zip = (struct zip *)(a->format->data);
2546         size_t bs = 256 * 1024;
2547
2548         if (zip->decrypted_buffer == NULL) {
2549                 zip->decrypted_buffer_size = bs;
2550                 zip->decrypted_buffer = malloc(bs);
2551                 if (zip->decrypted_buffer == NULL) {
2552                         archive_set_error(&a->archive, ENOMEM,
2553                             "No memory for ZIP decryption");
2554                         return (ARCHIVE_FATAL);
2555                 }
2556         }
2557         zip->decrypted_ptr = zip->decrypted_buffer;
2558         return (ARCHIVE_OK);
2559 }
2560
2561 static int
2562 init_traditional_PKWARE_decryption(struct archive_read *a)
2563 {
2564         struct zip *zip = (struct zip *)(a->format->data);
2565         const void *p;
2566         int retry;
2567         int r;
2568
2569         if (zip->tctx_valid)
2570                 return (ARCHIVE_OK);
2571
2572         /*
2573            Read the 12 bytes encryption header stored at
2574            the start of the data area.
2575          */
2576 #define ENC_HEADER_SIZE 12
2577         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2578             && zip->entry_bytes_remaining < ENC_HEADER_SIZE) {
2579                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2580                     "Truncated Zip encrypted body: only %jd bytes available",
2581                     (intmax_t)zip->entry_bytes_remaining);
2582                 return (ARCHIVE_FATAL);
2583         }
2584
2585         p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL);
2586         if (p == NULL) {
2587                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2588                     "Truncated ZIP file data");
2589                 return (ARCHIVE_FATAL);
2590         }
2591
2592         for (retry = 0;; retry++) {
2593                 const char *passphrase;
2594                 uint8_t crcchk;
2595
2596                 passphrase = __archive_read_next_passphrase(a);
2597                 if (passphrase == NULL) {
2598                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2599                             (retry > 0)?
2600                                 "Incorrect passphrase":
2601                                 "Passphrase required for this entry");
2602                         return (ARCHIVE_FAILED);
2603                 }
2604
2605                 /*
2606                  * Initialize ctx for Traditional PKWARE Decryption.
2607                  */
2608                 r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase),
2609                         p, ENC_HEADER_SIZE, &crcchk);
2610                 if (r == 0 && crcchk == zip->entry->decdat)
2611                         break;/* The passphrase is OK. */
2612                 if (retry > 10000) {
2613                         /* Avoid infinity loop. */
2614                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2615                             "Too many incorrect passphrases");
2616                         return (ARCHIVE_FAILED);
2617                 }
2618         }
2619
2620         __archive_read_consume(a, ENC_HEADER_SIZE);
2621         zip->tctx_valid = 1;
2622         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
2623             zip->entry_bytes_remaining -= ENC_HEADER_SIZE;
2624         }
2625         /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/
2626         zip->entry_compressed_bytes_read += ENC_HEADER_SIZE;
2627         zip->decrypted_bytes_remaining = 0;
2628
2629         return (zip_alloc_decryption_buffer(a));
2630 #undef ENC_HEADER_SIZE
2631 }
2632
2633 static int
2634 init_WinZip_AES_decryption(struct archive_read *a)
2635 {
2636         struct zip *zip = (struct zip *)(a->format->data);
2637         const void *p;
2638         const uint8_t *pv;
2639         size_t key_len, salt_len;
2640         uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE];
2641         int retry;
2642         int r;
2643
2644         if (zip->cctx_valid || zip->hctx_valid)
2645                 return (ARCHIVE_OK);
2646
2647         switch (zip->entry->aes_extra.strength) {
2648         case 1: salt_len = 8;  key_len = 16; break;
2649         case 2: salt_len = 12; key_len = 24; break;
2650         case 3: salt_len = 16; key_len = 32; break;
2651         default: goto corrupted;
2652         }
2653         p = __archive_read_ahead(a, salt_len + 2, NULL);
2654         if (p == NULL)
2655                 goto truncated;
2656
2657         for (retry = 0;; retry++) {
2658                 const char *passphrase;
2659
2660                 passphrase = __archive_read_next_passphrase(a);
2661                 if (passphrase == NULL) {
2662                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2663                             (retry > 0)?
2664                                 "Incorrect passphrase":
2665                                 "Passphrase required for this entry");
2666                         return (ARCHIVE_FAILED);
2667                 }
2668                 memset(derived_key, 0, sizeof(derived_key));
2669                 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase),
2670                     p, salt_len, 1000, derived_key, key_len * 2 + 2);
2671                 if (r != 0) {
2672                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2673                             "Decryption is unsupported due to lack of "
2674                             "crypto library");
2675                         return (ARCHIVE_FAILED);
2676                 }
2677
2678                 /* Check password verification value. */
2679                 pv = ((const uint8_t *)p) + salt_len;
2680                 if (derived_key[key_len * 2] == pv[0] &&
2681                     derived_key[key_len * 2 + 1] == pv[1])
2682                         break;/* The passphrase is OK. */
2683                 if (retry > 10000) {
2684                         /* Avoid infinity loop. */
2685                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2686                             "Too many incorrect passphrases");
2687                         return (ARCHIVE_FAILED);
2688                 }
2689         }
2690
2691         r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len);
2692         if (r != 0) {
2693                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2694                     "Decryption is unsupported due to lack of crypto library");
2695                 return (ARCHIVE_FAILED);
2696         }
2697         r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len);
2698         if (r != 0) {
2699                 archive_decrypto_aes_ctr_release(&zip->cctx);
2700                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2701                     "Failed to initialize HMAC-SHA1");
2702                 return (ARCHIVE_FAILED);
2703         }
2704         zip->cctx_valid = zip->hctx_valid = 1;
2705         __archive_read_consume(a, salt_len + 2);
2706         zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE;
2707         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2708             && zip->entry_bytes_remaining < 0)
2709                 goto corrupted;
2710         zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE;
2711         zip->decrypted_bytes_remaining = 0;
2712
2713         zip->entry->compression = zip->entry->aes_extra.compression;
2714         return (zip_alloc_decryption_buffer(a));
2715
2716 truncated:
2717         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2718             "Truncated ZIP file data");
2719         return (ARCHIVE_FATAL);
2720 corrupted:
2721         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2722             "Corrupted ZIP file data");
2723         return (ARCHIVE_FATAL);
2724 }
2725
2726 static int
2727 archive_read_format_zip_read_data(struct archive_read *a,
2728     const void **buff, size_t *size, int64_t *offset)
2729 {
2730         int r;
2731         struct zip *zip = (struct zip *)(a->format->data);
2732
2733         if (zip->has_encrypted_entries ==
2734                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
2735                 zip->has_encrypted_entries = 0;
2736         }
2737
2738         *offset = zip->entry_uncompressed_bytes_read;
2739         *size = 0;
2740         *buff = NULL;
2741
2742         /* If we hit end-of-entry last time, return ARCHIVE_EOF. */
2743         if (zip->end_of_entry)
2744                 return (ARCHIVE_EOF);
2745
2746         /* Return EOF immediately if this is a non-regular file. */
2747         if (AE_IFREG != (zip->entry->mode & AE_IFMT))
2748                 return (ARCHIVE_EOF);
2749
2750         __archive_read_consume(a, zip->unconsumed);
2751         zip->unconsumed = 0;
2752
2753         if (zip->init_decryption) {
2754                 zip->has_encrypted_entries = 1;
2755                 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
2756                         r = read_decryption_header(a);
2757                 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
2758                         r = init_WinZip_AES_decryption(a);
2759                 else
2760                         r = init_traditional_PKWARE_decryption(a);
2761                 if (r != ARCHIVE_OK)
2762                         return (r);
2763                 zip->init_decryption = 0;
2764         }
2765
2766         switch(zip->entry->compression) {
2767         case 0:  /* No compression. */
2768                 r =  zip_read_data_none(a, buff, size, offset);
2769                 break;
2770 #ifdef HAVE_BZLIB_H
2771         case 12: /* ZIPx bzip2 compression. */
2772                 r = zip_read_data_zipx_bzip2(a, buff, size, offset);
2773                 break;
2774 #endif
2775 #if HAVE_LZMA_H && HAVE_LIBLZMA
2776         case 14: /* ZIPx LZMA compression. */
2777                 r = zip_read_data_zipx_lzma_alone(a, buff, size, offset);
2778                 break;
2779         case 95: /* ZIPx XZ compression. */
2780                 r = zip_read_data_zipx_xz(a, buff, size, offset);
2781                 break;
2782 #endif
2783         /* PPMd support is built-in, so we don't need any #if guards. */
2784         case 98: /* ZIPx PPMd compression. */
2785                 r = zip_read_data_zipx_ppmd(a, buff, size, offset);
2786                 break;
2787
2788 #ifdef HAVE_ZLIB_H
2789         case 8: /* Deflate compression. */
2790                 r =  zip_read_data_deflate(a, buff, size, offset);
2791                 break;
2792 #endif
2793         default: /* Unsupported compression. */
2794                 /* Return a warning. */
2795                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2796                     "Unsupported ZIP compression method (%d: %s)",
2797                     zip->entry->compression, compression_name(zip->entry->compression));
2798                 /* We can't decompress this entry, but we will
2799                  * be able to skip() it and try the next entry. */
2800                 return (ARCHIVE_FAILED);
2801                 break;
2802         }
2803         if (r != ARCHIVE_OK)
2804                 return (r);
2805         /* Update checksum */
2806         if (*size)
2807                 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff,
2808                     (unsigned)*size);
2809         /* If we hit the end, swallow any end-of-data marker. */
2810         if (zip->end_of_entry) {
2811                 /* Check file size, CRC against these values. */
2812                 if (zip->entry->compressed_size !=
2813                     zip->entry_compressed_bytes_read) {
2814                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2815                             "ZIP compressed data is wrong size "
2816                             "(read %jd, expected %jd)",
2817                             (intmax_t)zip->entry_compressed_bytes_read,
2818                             (intmax_t)zip->entry->compressed_size);
2819                         return (ARCHIVE_WARN);
2820                 }
2821                 /* Size field only stores the lower 32 bits of the actual
2822                  * size. */
2823                 if ((zip->entry->uncompressed_size & UINT32_MAX)
2824                     != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) {
2825                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2826                             "ZIP uncompressed data is wrong size "
2827                             "(read %jd, expected %jd)\n",
2828                             (intmax_t)zip->entry_uncompressed_bytes_read,
2829                             (intmax_t)zip->entry->uncompressed_size);
2830                         return (ARCHIVE_WARN);
2831                 }
2832                 /* Check computed CRC against header */
2833                 if ((!zip->hctx_valid ||
2834                       zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) &&
2835                    zip->entry->crc32 != zip->entry_crc32
2836                     && !zip->ignore_crc32) {
2837                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2838                             "ZIP bad CRC: 0x%lx should be 0x%lx",
2839                             (unsigned long)zip->entry_crc32,
2840                             (unsigned long)zip->entry->crc32);
2841                         return (ARCHIVE_WARN);
2842                 }
2843         }
2844
2845         return (ARCHIVE_OK);
2846 }
2847
2848 static int
2849 archive_read_format_zip_cleanup(struct archive_read *a)
2850 {
2851         struct zip *zip;
2852         struct zip_entry *zip_entry, *next_zip_entry;
2853
2854         zip = (struct zip *)(a->format->data);
2855
2856 #ifdef HAVE_ZLIB_H
2857         if (zip->stream_valid)
2858                 inflateEnd(&zip->stream);
2859 #endif
2860
2861 #if HAVE_LZMA_H && HAVE_LIBLZMA
2862     if (zip->zipx_lzma_valid) {
2863                 lzma_end(&zip->zipx_lzma_stream);
2864         }
2865 #endif
2866
2867 #ifdef HAVE_BZLIB_H
2868         if (zip->bzstream_valid) {
2869                 BZ2_bzDecompressEnd(&zip->bzstream);
2870         }
2871 #endif
2872
2873         free(zip->uncompressed_buffer);
2874
2875         if (zip->ppmd8_valid)
2876                 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8);
2877
2878         if (zip->zip_entries) {
2879                 zip_entry = zip->zip_entries;
2880                 while (zip_entry != NULL) {
2881                         next_zip_entry = zip_entry->next;
2882                         archive_string_free(&zip_entry->rsrcname);
2883                         free(zip_entry);
2884                         zip_entry = next_zip_entry;
2885                 }
2886         }
2887         free(zip->decrypted_buffer);
2888         if (zip->cctx_valid)
2889                 archive_decrypto_aes_ctr_release(&zip->cctx);
2890         if (zip->hctx_valid)
2891                 archive_hmac_sha1_cleanup(&zip->hctx);
2892         free(zip->iv);
2893         free(zip->erd);
2894         free(zip->v_data);
2895         archive_string_free(&zip->format_name);
2896         free(zip);
2897         (a->format->data) = NULL;
2898         return (ARCHIVE_OK);
2899 }
2900
2901 static int
2902 archive_read_format_zip_has_encrypted_entries(struct archive_read *_a)
2903 {
2904         if (_a && _a->format) {
2905                 struct zip * zip = (struct zip *)_a->format->data;
2906                 if (zip) {
2907                         return zip->has_encrypted_entries;
2908                 }
2909         }
2910         return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
2911 }
2912
2913 static int
2914 archive_read_format_zip_options(struct archive_read *a,
2915     const char *key, const char *val)
2916 {
2917         struct zip *zip;
2918         int ret = ARCHIVE_FAILED;
2919
2920         zip = (struct zip *)(a->format->data);
2921         if (strcmp(key, "compat-2x")  == 0) {
2922                 /* Handle filenames as libarchive 2.x */
2923                 zip->init_default_conversion = (val != NULL) ? 1 : 0;
2924                 return (ARCHIVE_OK);
2925         } else if (strcmp(key, "hdrcharset")  == 0) {
2926                 if (val == NULL || val[0] == 0)
2927                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2928                             "zip: hdrcharset option needs a character-set name"
2929                         );
2930                 else {
2931                         zip->sconv = archive_string_conversion_from_charset(
2932                             &a->archive, val, 0);
2933                         if (zip->sconv != NULL) {
2934                                 if (strcmp(val, "UTF-8") == 0)
2935                                         zip->sconv_utf8 = zip->sconv;
2936                                 ret = ARCHIVE_OK;
2937                         } else
2938                                 ret = ARCHIVE_FATAL;
2939                 }
2940                 return (ret);
2941         } else if (strcmp(key, "ignorecrc32") == 0) {
2942                 /* Mostly useful for testing. */
2943                 if (val == NULL || val[0] == 0) {
2944                         zip->crc32func = real_crc32;
2945                         zip->ignore_crc32 = 0;
2946                 } else {
2947                         zip->crc32func = fake_crc32;
2948                         zip->ignore_crc32 = 1;
2949                 }
2950                 return (ARCHIVE_OK);
2951         } else if (strcmp(key, "mac-ext") == 0) {
2952                 zip->process_mac_extensions = (val != NULL && val[0] != 0);
2953                 return (ARCHIVE_OK);
2954         }
2955
2956         /* Note: The "warn" return is just to inform the options
2957          * supervisor that we didn't handle it.  It will generate
2958          * a suitable error if no one used this option. */
2959         return (ARCHIVE_WARN);
2960 }
2961
2962 int
2963 archive_read_support_format_zip(struct archive *a)
2964 {
2965         int r;
2966         r = archive_read_support_format_zip_streamable(a);
2967         if (r != ARCHIVE_OK)
2968                 return r;
2969         return (archive_read_support_format_zip_seekable(a));
2970 }
2971
2972 /* ------------------------------------------------------------------------ */
2973
2974 /*
2975  * Streaming-mode support
2976  */
2977
2978
2979 static int
2980 archive_read_support_format_zip_capabilities_streamable(struct archive_read * a)
2981 {
2982         (void)a; /* UNUSED */
2983         return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
2984                 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
2985 }
2986
2987 static int
2988 archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid)
2989 {
2990         const char *p;
2991
2992         (void)best_bid; /* UNUSED */
2993
2994         if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
2995                 return (-1);
2996
2997         /*
2998          * Bid of 29 here comes from:
2999          *  + 16 bits for "PK",
3000          *  + next 16-bit field has 6 options so contributes
3001          *    about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits
3002          *
3003          * So we've effectively verified ~29 total bits of check data.
3004          */
3005         if (p[0] == 'P' && p[1] == 'K') {
3006                 if ((p[2] == '\001' && p[3] == '\002')
3007                     || (p[2] == '\003' && p[3] == '\004')
3008                     || (p[2] == '\005' && p[3] == '\006')
3009                     || (p[2] == '\006' && p[3] == '\006')
3010                     || (p[2] == '\007' && p[3] == '\010')
3011                     || (p[2] == '0' && p[3] == '0'))
3012                         return (29);
3013         }
3014
3015         /* TODO: It's worth looking ahead a little bit for a valid
3016          * PK signature.  In particular, that would make it possible
3017          * to read some UUEncoded SFX files or SFX files coming from
3018          * a network socket. */
3019
3020         return (0);
3021 }
3022
3023 static int
3024 archive_read_format_zip_streamable_read_header(struct archive_read *a,
3025     struct archive_entry *entry)
3026 {
3027         struct zip *zip;
3028
3029         a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
3030         if (a->archive.archive_format_name == NULL)
3031                 a->archive.archive_format_name = "ZIP";
3032
3033         zip = (struct zip *)(a->format->data);
3034
3035         /*
3036          * It should be sufficient to call archive_read_next_header() for
3037          * a reader to determine if an entry is encrypted or not. If the
3038          * encryption of an entry is only detectable when calling
3039          * archive_read_data(), so be it. We'll do the same check there
3040          * as well.
3041          */
3042         if (zip->has_encrypted_entries ==
3043                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
3044                 zip->has_encrypted_entries = 0;
3045
3046         /* Make sure we have a zip_entry structure to use. */
3047         if (zip->zip_entries == NULL) {
3048                 zip->zip_entries = malloc(sizeof(struct zip_entry));
3049                 if (zip->zip_entries == NULL) {
3050                         archive_set_error(&a->archive, ENOMEM,
3051                             "Out  of memory");
3052                         return ARCHIVE_FATAL;
3053                 }
3054         }
3055         zip->entry = zip->zip_entries;
3056         memset(zip->entry, 0, sizeof(struct zip_entry));
3057
3058         if (zip->cctx_valid)
3059                 archive_decrypto_aes_ctr_release(&zip->cctx);
3060         if (zip->hctx_valid)
3061                 archive_hmac_sha1_cleanup(&zip->hctx);
3062         zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
3063         __archive_read_reset_passphrase(a);
3064
3065         /* Search ahead for the next local file header. */
3066         __archive_read_consume(a, zip->unconsumed);
3067         zip->unconsumed = 0;
3068         for (;;) {
3069                 int64_t skipped = 0;
3070                 const char *p, *end;
3071                 ssize_t bytes;
3072
3073                 p = __archive_read_ahead(a, 4, &bytes);
3074                 if (p == NULL)
3075                         return (ARCHIVE_FATAL);
3076                 end = p + bytes;
3077
3078                 while (p + 4 <= end) {
3079                         if (p[0] == 'P' && p[1] == 'K') {
3080                                 if (p[2] == '\003' && p[3] == '\004') {
3081                                         /* Regular file entry. */
3082                                         __archive_read_consume(a, skipped);
3083                                         return zip_read_local_file_header(a,
3084                                             entry, zip);
3085                                 }
3086
3087                               /*
3088                                * TODO: We cannot restore permissions
3089                                * based only on the local file headers.
3090                                * Consider scanning the central
3091                                * directory and returning additional
3092                                * entries for at least directories.
3093                                * This would allow us to properly set
3094                                * directory permissions.
3095                                *
3096                                * This won't help us fix symlinks
3097                                * and may not help with regular file
3098                                * permissions, either.  <sigh>
3099                                */
3100                               if (p[2] == '\001' && p[3] == '\002') {
3101                                       return (ARCHIVE_EOF);
3102                               }
3103
3104                               /* End of central directory?  Must be an
3105                                * empty archive. */
3106                               if ((p[2] == '\005' && p[3] == '\006')
3107                                   || (p[2] == '\006' && p[3] == '\006'))
3108                                       return (ARCHIVE_EOF);
3109                         }
3110                         ++p;
3111                         ++skipped;
3112                 }
3113                 __archive_read_consume(a, skipped);
3114         }
3115 }
3116
3117 static int
3118 archive_read_format_zip_read_data_skip_streamable(struct archive_read *a)
3119 {
3120         struct zip *zip;
3121         int64_t bytes_skipped;
3122
3123         zip = (struct zip *)(a->format->data);
3124         bytes_skipped = __archive_read_consume(a, zip->unconsumed);
3125         zip->unconsumed = 0;
3126         if (bytes_skipped < 0)
3127                 return (ARCHIVE_FATAL);
3128
3129         /* If we've already read to end of data, we're done. */
3130         if (zip->end_of_entry)
3131                 return (ARCHIVE_OK);
3132
3133         /* So we know we're streaming... */
3134         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
3135             || zip->entry->compressed_size > 0) {
3136                 /* We know the compressed length, so we can just skip. */
3137                 bytes_skipped = __archive_read_consume(a,
3138                                         zip->entry_bytes_remaining);
3139                 if (bytes_skipped < 0)
3140                         return (ARCHIVE_FATAL);
3141                 return (ARCHIVE_OK);
3142         }
3143
3144         if (zip->init_decryption) {
3145                 int r;
3146
3147                 zip->has_encrypted_entries = 1;
3148                 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
3149                         r = read_decryption_header(a);
3150                 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
3151                         r = init_WinZip_AES_decryption(a);
3152                 else
3153                         r = init_traditional_PKWARE_decryption(a);
3154                 if (r != ARCHIVE_OK)
3155                         return (r);
3156                 zip->init_decryption = 0;
3157         }
3158
3159         /* We're streaming and we don't know the length. */
3160         /* If the body is compressed and we know the format, we can
3161          * find an exact end-of-entry by decompressing it. */
3162         switch (zip->entry->compression) {
3163 #ifdef HAVE_ZLIB_H
3164         case 8: /* Deflate compression. */
3165                 while (!zip->end_of_entry) {
3166                         int64_t offset = 0;
3167                         const void *buff = NULL;
3168                         size_t size = 0;
3169                         int r;
3170                         r =  zip_read_data_deflate(a, &buff, &size, &offset);
3171                         if (r != ARCHIVE_OK)
3172                                 return (r);
3173                 }
3174                 return ARCHIVE_OK;
3175 #endif
3176         default: /* Uncompressed or unknown. */
3177                 /* Scan for a PK\007\010 signature. */
3178                 for (;;) {
3179                         const char *p, *buff;
3180                         ssize_t bytes_avail;
3181                         buff = __archive_read_ahead(a, 16, &bytes_avail);
3182                         if (bytes_avail < 16) {
3183                                 archive_set_error(&a->archive,
3184                                     ARCHIVE_ERRNO_FILE_FORMAT,
3185                                     "Truncated ZIP file data");
3186                                 return (ARCHIVE_FATAL);
3187                         }
3188                         p = buff;
3189                         while (p <= buff + bytes_avail - 16) {
3190                                 if (p[3] == 'P') { p += 3; }
3191                                 else if (p[3] == 'K') { p += 2; }
3192                                 else if (p[3] == '\007') { p += 1; }
3193                                 else if (p[3] == '\010' && p[2] == '\007'
3194                                     && p[1] == 'K' && p[0] == 'P') {
3195                                         if (zip->entry->flags & LA_USED_ZIP64)
3196                                                 __archive_read_consume(a,
3197                                                     p - buff + 24);
3198                                         else
3199                                                 __archive_read_consume(a,
3200                                                     p - buff + 16);
3201                                         return ARCHIVE_OK;
3202                                 } else { p += 4; }
3203                         }
3204                         __archive_read_consume(a, p - buff);
3205                 }
3206         }
3207 }
3208
3209 int
3210 archive_read_support_format_zip_streamable(struct archive *_a)
3211 {
3212         struct archive_read *a = (struct archive_read *)_a;
3213         struct zip *zip;
3214         int r;
3215
3216         archive_check_magic(_a, ARCHIVE_READ_MAGIC,
3217             ARCHIVE_STATE_NEW, "archive_read_support_format_zip");
3218
3219         zip = (struct zip *)calloc(1, sizeof(*zip));
3220         if (zip == NULL) {
3221                 archive_set_error(&a->archive, ENOMEM,
3222                     "Can't allocate zip data");
3223                 return (ARCHIVE_FATAL);
3224         }
3225
3226         /* Streamable reader doesn't support mac extensions. */
3227         zip->process_mac_extensions = 0;
3228
3229         /*
3230          * Until enough data has been read, we cannot tell about
3231          * any encrypted entries yet.
3232          */
3233         zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
3234         zip->crc32func = real_crc32;
3235
3236         r = __archive_read_register_format(a,
3237             zip,
3238             "zip",
3239             archive_read_format_zip_streamable_bid,
3240             archive_read_format_zip_options,
3241             archive_read_format_zip_streamable_read_header,
3242             archive_read_format_zip_read_data,
3243             archive_read_format_zip_read_data_skip_streamable,
3244             NULL,
3245             archive_read_format_zip_cleanup,
3246             archive_read_support_format_zip_capabilities_streamable,
3247             archive_read_format_zip_has_encrypted_entries);
3248
3249         if (r != ARCHIVE_OK)
3250                 free(zip);
3251         return (ARCHIVE_OK);
3252 }
3253
3254 /* ------------------------------------------------------------------------ */
3255
3256 /*
3257  * Seeking-mode support
3258  */
3259
3260 static int
3261 archive_read_support_format_zip_capabilities_seekable(struct archive_read * a)
3262 {
3263         (void)a; /* UNUSED */
3264         return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
3265                 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
3266 }
3267
3268 /*
3269  * TODO: This is a performance sink because it forces the read core to
3270  * drop buffered data from the start of file, which will then have to
3271  * be re-read again if this bidder loses.
3272  *
3273  * We workaround this a little by passing in the best bid so far so
3274  * that later bidders can do nothing if they know they'll never
3275  * outbid.  But we can certainly do better...
3276  */
3277 static int
3278 read_eocd(struct zip *zip, const char *p, int64_t current_offset)
3279 {
3280         /* Sanity-check the EOCD we've found. */
3281
3282         /* This must be the first volume. */
3283         if (archive_le16dec(p + 4) != 0)
3284                 return 0;
3285         /* Central directory must be on this volume. */
3286         if (archive_le16dec(p + 4) != archive_le16dec(p + 6))
3287                 return 0;
3288         /* All central directory entries must be on this volume. */
3289         if (archive_le16dec(p + 10) != archive_le16dec(p + 8))
3290                 return 0;
3291         /* Central directory can't extend beyond start of EOCD record. */
3292         if (archive_le32dec(p + 16) + archive_le32dec(p + 12)
3293             > current_offset)
3294                 return 0;
3295
3296         /* Save the central directory location for later use. */
3297         zip->central_directory_offset = archive_le32dec(p + 16);
3298
3299         /* This is just a tiny bit higher than the maximum
3300            returned by the streaming Zip bidder.  This ensures
3301            that the more accurate seeking Zip parser wins
3302            whenever seek is available. */
3303         return 32;
3304 }
3305
3306 /*
3307  * Examine Zip64 EOCD locator:  If it's valid, store the information
3308  * from it.
3309  */
3310 static int
3311 read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p)
3312 {
3313         int64_t eocd64_offset;
3314         int64_t eocd64_size;
3315
3316         /* Sanity-check the locator record. */
3317
3318         /* Central dir must be on first volume. */
3319         if (archive_le32dec(p + 4) != 0)
3320                 return 0;
3321         /* Must be only a single volume. */
3322         if (archive_le32dec(p + 16) != 1)
3323                 return 0;
3324
3325         /* Find the Zip64 EOCD record. */
3326         eocd64_offset = archive_le64dec(p + 8);
3327         if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0)
3328                 return 0;
3329         if ((p = __archive_read_ahead(a, 56, NULL)) == NULL)
3330                 return 0;
3331         /* Make sure we can read all of it. */
3332         eocd64_size = archive_le64dec(p + 4) + 12;
3333         if (eocd64_size < 56 || eocd64_size > 16384)
3334                 return 0;
3335         if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL)
3336                 return 0;
3337
3338         /* Sanity-check the EOCD64 */
3339         if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */
3340                 return 0;
3341         if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */
3342                 return 0;
3343         /* CD can't be split. */
3344         if (archive_le64dec(p + 24) != archive_le64dec(p + 32))
3345                 return 0;
3346
3347         /* Save the central directory offset for later use. */
3348         zip->central_directory_offset = archive_le64dec(p + 48);
3349
3350         return 32;
3351 }
3352
3353 static int
3354 archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid)
3355 {
3356         struct zip *zip = (struct zip *)a->format->data;
3357         int64_t file_size, current_offset;
3358         const char *p;
3359         int i, tail;
3360
3361         /* If someone has already bid more than 32, then avoid
3362            trashing the look-ahead buffers with a seek. */
3363         if (best_bid > 32)
3364                 return (-1);
3365
3366         file_size = __archive_read_seek(a, 0, SEEK_END);
3367         if (file_size <= 0)
3368                 return 0;
3369
3370         /* Search last 16k of file for end-of-central-directory
3371          * record (which starts with PK\005\006) */
3372         tail = (int)zipmin(1024 * 16, file_size);
3373         current_offset = __archive_read_seek(a, -tail, SEEK_END);
3374         if (current_offset < 0)
3375                 return 0;
3376         if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL)
3377                 return 0;
3378         /* Boyer-Moore search backwards from the end, since we want
3379          * to match the last EOCD in the file (there can be more than
3380          * one if there is an uncompressed Zip archive as a member
3381          * within this Zip archive). */
3382         for (i = tail - 22; i > 0;) {
3383                 switch (p[i]) {
3384                 case 'P':
3385                         if (memcmp(p + i, "PK\005\006", 4) == 0) {
3386                                 int ret = read_eocd(zip, p + i,
3387                                     current_offset + i);
3388                                 /* Zip64 EOCD locator precedes
3389                                  * regular EOCD if present. */
3390                                 if (i >= 20 && memcmp(p + i - 20, "PK\006\007", 4) == 0) {
3391                                         int ret_zip64 = read_zip64_eocd(a, zip, p + i - 20);
3392                                         if (ret_zip64 > ret)
3393                                                 ret = ret_zip64;
3394                                 }
3395                                 return (ret);
3396                         }
3397                         i -= 4;
3398                         break;
3399                 case 'K': i -= 1; break;
3400                 case 005: i -= 2; break;
3401                 case 006: i -= 3; break;
3402                 default: i -= 4; break;
3403                 }
3404         }
3405         return 0;
3406 }
3407
3408 /* The red-black trees are only used in seeking mode to manage
3409  * the in-memory copy of the central directory. */
3410
3411 static int
3412 cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2)
3413 {
3414         const struct zip_entry *e1 = (const struct zip_entry *)n1;
3415         const struct zip_entry *e2 = (const struct zip_entry *)n2;
3416
3417         if (e1->local_header_offset > e2->local_header_offset)
3418                 return -1;
3419         if (e1->local_header_offset < e2->local_header_offset)
3420                 return 1;
3421         return 0;
3422 }
3423
3424 static int
3425 cmp_key(const struct archive_rb_node *n, const void *key)
3426 {
3427         /* This function won't be called */
3428         (void)n; /* UNUSED */
3429         (void)key; /* UNUSED */
3430         return 1;
3431 }
3432
3433 static const struct archive_rb_tree_ops rb_ops = {
3434         &cmp_node, &cmp_key
3435 };
3436
3437 static int
3438 rsrc_cmp_node(const struct archive_rb_node *n1,
3439     const struct archive_rb_node *n2)
3440 {
3441         const struct zip_entry *e1 = (const struct zip_entry *)n1;
3442         const struct zip_entry *e2 = (const struct zip_entry *)n2;
3443
3444         return (strcmp(e2->rsrcname.s, e1->rsrcname.s));
3445 }
3446
3447 static int
3448 rsrc_cmp_key(const struct archive_rb_node *n, const void *key)
3449 {
3450         const struct zip_entry *e = (const struct zip_entry *)n;
3451         return (strcmp((const char *)key, e->rsrcname.s));
3452 }
3453
3454 static const struct archive_rb_tree_ops rb_rsrc_ops = {
3455         &rsrc_cmp_node, &rsrc_cmp_key
3456 };
3457
3458 static const char *
3459 rsrc_basename(const char *name, size_t name_length)
3460 {
3461         const char *s, *r;
3462
3463         r = s = name;
3464         for (;;) {
3465                 s = memchr(s, '/', name_length - (s - name));
3466                 if (s == NULL)
3467                         break;
3468                 r = ++s;
3469         }
3470         return (r);
3471 }
3472
3473 static void
3474 expose_parent_dirs(struct zip *zip, const char *name, size_t name_length)
3475 {
3476         struct archive_string str;
3477         struct zip_entry *dir;
3478         char *s;
3479
3480         archive_string_init(&str);
3481         archive_strncpy(&str, name, name_length);
3482         for (;;) {
3483                 s = strrchr(str.s, '/');
3484                 if (s == NULL)
3485                         break;
3486                 *s = '\0';
3487                 /* Transfer the parent directory from zip->tree_rsrc RB
3488                  * tree to zip->tree RB tree to expose. */
3489                 dir = (struct zip_entry *)
3490                     __archive_rb_tree_find_node(&zip->tree_rsrc, str.s);
3491                 if (dir == NULL)
3492                         break;
3493                 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node);
3494                 archive_string_free(&dir->rsrcname);
3495                 __archive_rb_tree_insert_node(&zip->tree, &dir->node);
3496         }
3497         archive_string_free(&str);
3498 }
3499
3500 static int
3501 slurp_central_directory(struct archive_read *a, struct archive_entry* entry,
3502     struct zip *zip)
3503 {
3504         ssize_t i;
3505         unsigned found;
3506         int64_t correction;
3507         ssize_t bytes_avail;
3508         const char *p;
3509
3510         /*
3511          * Find the start of the central directory.  The end-of-CD
3512          * record has our starting point, but there are lots of
3513          * Zip archives which have had other data prepended to the
3514          * file, which makes the recorded offsets all too small.
3515          * So we search forward from the specified offset until we
3516          * find the real start of the central directory.  Then we
3517          * know the correction we need to apply to account for leading
3518          * padding.
3519          */
3520         if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0)
3521                 return ARCHIVE_FATAL;
3522
3523         found = 0;
3524         while (!found) {
3525                 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL)
3526                         return ARCHIVE_FATAL;
3527                 for (found = 0, i = 0; !found && i < bytes_avail - 4;) {
3528                         switch (p[i + 3]) {
3529                         case 'P': i += 3; break;
3530                         case 'K': i += 2; break;
3531                         case 001: i += 1; break;
3532                         case 002:
3533                                 if (memcmp(p + i, "PK\001\002", 4) == 0) {
3534                                         p += i;
3535                                         found = 1;
3536                                 } else
3537                                         i += 4;
3538                                 break;
3539                         case 005: i += 1; break;
3540                         case 006:
3541                                 if (memcmp(p + i, "PK\005\006", 4) == 0) {
3542                                         p += i;
3543                                         found = 1;
3544                                 } else if (memcmp(p + i, "PK\006\006", 4) == 0) {
3545                                         p += i;
3546                                         found = 1;
3547                                 } else
3548                                         i += 1;
3549                                 break;
3550                         default: i += 4; break;
3551                         }
3552                 }
3553                 __archive_read_consume(a, i);
3554         }
3555         correction = archive_filter_bytes(&a->archive, 0)
3556                         - zip->central_directory_offset;
3557
3558         __archive_rb_tree_init(&zip->tree, &rb_ops);
3559         __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops);
3560
3561         zip->central_directory_entries_total = 0;
3562         while (1) {
3563                 struct zip_entry *zip_entry;
3564                 size_t filename_length, extra_length, comment_length;
3565                 uint32_t external_attributes;
3566                 const char *name, *r;
3567
3568                 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
3569                         return ARCHIVE_FATAL;
3570                 if (memcmp(p, "PK\006\006", 4) == 0
3571                     || memcmp(p, "PK\005\006", 4) == 0) {
3572                         break;
3573                 } else if (memcmp(p, "PK\001\002", 4) != 0) {
3574                         archive_set_error(&a->archive,
3575                             -1, "Invalid central directory signature");
3576                         return ARCHIVE_FATAL;
3577                 }
3578                 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL)
3579                         return ARCHIVE_FATAL;
3580
3581                 zip_entry = calloc(1, sizeof(struct zip_entry));
3582                 if (zip_entry == NULL) {
3583                         archive_set_error(&a->archive, ENOMEM,
3584                                 "Can't allocate zip entry");
3585                         return ARCHIVE_FATAL;
3586                 }
3587                 zip_entry->next = zip->zip_entries;
3588                 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY;
3589                 zip->zip_entries = zip_entry;
3590                 zip->central_directory_entries_total++;
3591
3592                 /* version = p[4]; */
3593                 zip_entry->system = p[5];
3594                 /* version_required = archive_le16dec(p + 6); */
3595                 zip_entry->zip_flags = archive_le16dec(p + 8);
3596                 if (zip_entry->zip_flags
3597                       & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){
3598                         zip->has_encrypted_entries = 1;
3599                 }
3600                 zip_entry->compression = (char)archive_le16dec(p + 10);
3601                 zip_entry->mtime = zip_time(p + 12);
3602                 zip_entry->crc32 = archive_le32dec(p + 16);
3603                 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
3604                         zip_entry->decdat = p[13];
3605                 else
3606                         zip_entry->decdat = p[19];
3607                 zip_entry->compressed_size = archive_le32dec(p + 20);
3608                 zip_entry->uncompressed_size = archive_le32dec(p + 24);
3609                 filename_length = archive_le16dec(p + 28);
3610                 extra_length = archive_le16dec(p + 30);
3611                 comment_length = archive_le16dec(p + 32);
3612                 /* disk_start = archive_le16dec(p + 34);
3613                  *   Better be zero.
3614                  * internal_attributes = archive_le16dec(p + 36);
3615                  *   text bit */
3616                 external_attributes = archive_le32dec(p + 38);
3617                 zip_entry->local_header_offset =
3618                     archive_le32dec(p + 42) + correction;
3619
3620                 /* If we can't guess the mode, leave it zero here;
3621                    when we read the local file header we might get
3622                    more information. */
3623                 if (zip_entry->system == 3) {
3624                         zip_entry->mode = external_attributes >> 16;
3625                 } else if (zip_entry->system == 0) {
3626                         // Interpret MSDOS directory bit
3627                         if (0x10 == (external_attributes & 0x10)) {
3628                                 zip_entry->mode = AE_IFDIR | 0775;
3629                         } else {
3630                                 zip_entry->mode = AE_IFREG | 0664;
3631                         }
3632                         if (0x01 == (external_attributes & 0x01)) {
3633                                 // Read-only bit; strip write permissions
3634                                 zip_entry->mode &= 0555;
3635                         }
3636                 } else {
3637                         zip_entry->mode = 0;
3638                 }
3639
3640                 /* We're done with the regular data; get the filename and
3641                  * extra data. */
3642                 __archive_read_consume(a, 46);
3643                 p = __archive_read_ahead(a, filename_length + extra_length,
3644                         NULL);
3645                 if (p == NULL) {
3646                         archive_set_error(&a->archive,
3647                             ARCHIVE_ERRNO_FILE_FORMAT,
3648                             "Truncated ZIP file header");
3649                         return ARCHIVE_FATAL;
3650                 }
3651                 if (ARCHIVE_OK != process_extra(a, entry, p + filename_length,
3652                     extra_length, zip_entry)) {
3653                         return ARCHIVE_FATAL;
3654                 }
3655
3656                 /*
3657                  * Mac resource fork files are stored under the
3658                  * "__MACOSX/" directory, so we should check if
3659                  * it is.
3660                  */
3661                 if (!zip->process_mac_extensions) {
3662                         /* Treat every entry as a regular entry. */
3663                         __archive_rb_tree_insert_node(&zip->tree,
3664                             &zip_entry->node);
3665                 } else {
3666                         name = p;
3667                         r = rsrc_basename(name, filename_length);
3668                         if (filename_length >= 9 &&
3669                             strncmp("__MACOSX/", name, 9) == 0) {
3670                                 /* If this file is not a resource fork nor
3671                                  * a directory. We should treat it as a non
3672                                  * resource fork file to expose it. */
3673                                 if (name[filename_length-1] != '/' &&
3674                                     (r - name < 3 || r[0] != '.' ||
3675                                      r[1] != '_')) {
3676                                         __archive_rb_tree_insert_node(
3677                                             &zip->tree, &zip_entry->node);
3678                                         /* Expose its parent directories. */
3679                                         expose_parent_dirs(zip, name,
3680                                             filename_length);
3681                                 } else {
3682                                         /* This file is a resource fork file or
3683                                          * a directory. */
3684                                         archive_strncpy(&(zip_entry->rsrcname),
3685                                              name, filename_length);
3686                                         __archive_rb_tree_insert_node(
3687                                             &zip->tree_rsrc, &zip_entry->node);
3688                                 }
3689                         } else {
3690                                 /* Generate resource fork name to find its
3691                                  * resource file at zip->tree_rsrc. */
3692                                 archive_strcpy(&(zip_entry->rsrcname),
3693                                     "__MACOSX/");
3694                                 archive_strncat(&(zip_entry->rsrcname),
3695                                     name, r - name);
3696                                 archive_strcat(&(zip_entry->rsrcname), "._");
3697                                 archive_strncat(&(zip_entry->rsrcname),
3698                                     name + (r - name),
3699                                     filename_length - (r - name));
3700                                 /* Register an entry to RB tree to sort it by
3701                                  * file offset. */
3702                                 __archive_rb_tree_insert_node(&zip->tree,
3703                                     &zip_entry->node);
3704                         }
3705                 }
3706
3707                 /* Skip the comment too ... */
3708                 __archive_read_consume(a,
3709                     filename_length + extra_length + comment_length);
3710         }
3711
3712         return ARCHIVE_OK;
3713 }
3714
3715 static ssize_t
3716 zip_get_local_file_header_size(struct archive_read *a, size_t extra)
3717 {
3718         const char *p;
3719         ssize_t filename_length, extra_length;
3720
3721         if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) {
3722                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
3723                     "Truncated ZIP file header");
3724                 return (ARCHIVE_WARN);
3725         }
3726         p += extra;
3727
3728         if (memcmp(p, "PK\003\004", 4) != 0) {
3729                 archive_set_error(&a->archive, -1, "Damaged Zip archive");
3730                 return ARCHIVE_WARN;
3731         }
3732         filename_length = archive_le16dec(p + 26);
3733         extra_length = archive_le16dec(p + 28);
3734
3735         return (30 + filename_length + extra_length);
3736 }
3737
3738 static int
3739 zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
3740     struct zip_entry *rsrc)
3741 {
3742         struct zip *zip = (struct zip *)a->format->data;
3743         unsigned char *metadata, *mp;
3744         int64_t offset = archive_filter_bytes(&a->archive, 0);
3745         size_t remaining_bytes, metadata_bytes;
3746         ssize_t hsize;
3747         int ret = ARCHIVE_OK, eof;
3748
3749         switch(rsrc->compression) {
3750         case 0:  /* No compression. */
3751                 if (rsrc->uncompressed_size != rsrc->compressed_size) {
3752                         archive_set_error(&a->archive,
3753                             ARCHIVE_ERRNO_FILE_FORMAT,
3754                             "Malformed OS X metadata entry: "
3755                             "inconsistent size");
3756                         return (ARCHIVE_FATAL);
3757                 }
3758 #ifdef HAVE_ZLIB_H
3759         case 8: /* Deflate compression. */
3760 #endif
3761                 break;
3762         default: /* Unsupported compression. */
3763                 /* Return a warning. */
3764                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
3765                     "Unsupported ZIP compression method (%s)",
3766                     compression_name(rsrc->compression));
3767                 /* We can't decompress this entry, but we will
3768                  * be able to skip() it and try the next entry. */
3769                 return (ARCHIVE_WARN);
3770         }
3771
3772         if (rsrc->uncompressed_size > (4 * 1024 * 1024)) {
3773                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
3774                     "Mac metadata is too large: %jd > 4M bytes",
3775                     (intmax_t)rsrc->uncompressed_size);
3776                 return (ARCHIVE_WARN);
3777         }
3778         if (rsrc->compressed_size > (4 * 1024 * 1024)) {
3779                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
3780                     "Mac metadata is too large: %jd > 4M bytes",
3781                     (intmax_t)rsrc->compressed_size);
3782                 return (ARCHIVE_WARN);
3783         }
3784
3785         metadata = malloc((size_t)rsrc->uncompressed_size);
3786         if (metadata == NULL) {
3787                 archive_set_error(&a->archive, ENOMEM,
3788                     "Can't allocate memory for Mac metadata");
3789                 return (ARCHIVE_FATAL);
3790         }
3791
3792         if (offset < rsrc->local_header_offset)
3793                 __archive_read_consume(a, rsrc->local_header_offset - offset);
3794         else if (offset != rsrc->local_header_offset) {
3795                 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET);
3796         }
3797
3798         hsize = zip_get_local_file_header_size(a, 0);
3799         __archive_read_consume(a, hsize);
3800
3801         remaining_bytes = (size_t)rsrc->compressed_size;
3802         metadata_bytes = (size_t)rsrc->uncompressed_size;
3803         mp = metadata;
3804         eof = 0;
3805         while (!eof && remaining_bytes) {
3806                 const unsigned char *p;
3807                 ssize_t bytes_avail;
3808                 size_t bytes_used;
3809
3810                 p = __archive_read_ahead(a, 1, &bytes_avail);
3811                 if (p == NULL) {
3812                         archive_set_error(&a->archive,
3813                             ARCHIVE_ERRNO_FILE_FORMAT,
3814                             "Truncated ZIP file header");
3815                         ret = ARCHIVE_WARN;
3816                         goto exit_mac_metadata;
3817                 }
3818                 if ((size_t)bytes_avail > remaining_bytes)
3819                         bytes_avail = remaining_bytes;
3820                 switch(rsrc->compression) {
3821                 case 0:  /* No compression. */
3822                         if ((size_t)bytes_avail > metadata_bytes)
3823                                 bytes_avail = metadata_bytes;
3824                         memcpy(mp, p, bytes_avail);
3825                         bytes_used = (size_t)bytes_avail;
3826                         metadata_bytes -= bytes_used;
3827                         mp += bytes_used;
3828                         if (metadata_bytes == 0)
3829                                 eof = 1;
3830                         break;
3831 #ifdef HAVE_ZLIB_H
3832                 case 8: /* Deflate compression. */
3833                 {
3834                         int r;
3835
3836                         ret = zip_deflate_init(a, zip);
3837                         if (ret != ARCHIVE_OK)
3838                                 goto exit_mac_metadata;
3839                         zip->stream.next_in =
3840                             (Bytef *)(uintptr_t)(const void *)p;
3841                         zip->stream.avail_in = (uInt)bytes_avail;
3842                         zip->stream.total_in = 0;
3843                         zip->stream.next_out = mp;
3844                         zip->stream.avail_out = (uInt)metadata_bytes;
3845                         zip->stream.total_out = 0;
3846
3847                         r = inflate(&zip->stream, 0);
3848                         switch (r) {
3849                         case Z_OK:
3850                                 break;
3851                         case Z_STREAM_END:
3852                                 eof = 1;
3853                                 break;
3854                         case Z_MEM_ERROR:
3855                                 archive_set_error(&a->archive, ENOMEM,
3856                                     "Out of memory for ZIP decompression");
3857                                 ret = ARCHIVE_FATAL;
3858                                 goto exit_mac_metadata;
3859                         default:
3860                                 archive_set_error(&a->archive,
3861                                     ARCHIVE_ERRNO_MISC,
3862                                     "ZIP decompression failed (%d)", r);
3863                                 ret = ARCHIVE_FATAL;
3864                                 goto exit_mac_metadata;
3865                         }
3866                         bytes_used = zip->stream.total_in;
3867                         metadata_bytes -= zip->stream.total_out;
3868                         mp += zip->stream.total_out;
3869                         break;
3870                 }
3871 #endif
3872                 default:
3873                         bytes_used = 0;
3874                         break;
3875                 }
3876                 __archive_read_consume(a, bytes_used);
3877                 remaining_bytes -= bytes_used;
3878         }
3879         archive_entry_copy_mac_metadata(entry, metadata,
3880             (size_t)rsrc->uncompressed_size - metadata_bytes);
3881
3882 exit_mac_metadata:
3883         __archive_read_seek(a, offset, SEEK_SET);
3884         zip->decompress_init = 0;
3885         free(metadata);
3886         return (ret);
3887 }
3888
3889 static int
3890 archive_read_format_zip_seekable_read_header(struct archive_read *a,
3891         struct archive_entry *entry)
3892 {
3893         struct zip *zip = (struct zip *)a->format->data;
3894         struct zip_entry *rsrc;
3895         int64_t offset;
3896         int r, ret = ARCHIVE_OK;
3897
3898         /*
3899          * It should be sufficient to call archive_read_next_header() for
3900          * a reader to determine if an entry is encrypted or not. If the
3901          * encryption of an entry is only detectable when calling
3902          * archive_read_data(), so be it. We'll do the same check there
3903          * as well.
3904          */
3905         if (zip->has_encrypted_entries ==
3906                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
3907                 zip->has_encrypted_entries = 0;
3908
3909         a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
3910         if (a->archive.archive_format_name == NULL)
3911                 a->archive.archive_format_name = "ZIP";
3912
3913         if (zip->zip_entries == NULL) {
3914                 r = slurp_central_directory(a, entry, zip);
3915                 if (r != ARCHIVE_OK)
3916                         return r;
3917                 /* Get first entry whose local header offset is lower than
3918                  * other entries in the archive file. */
3919                 zip->entry =
3920                     (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree);
3921         } else if (zip->entry != NULL) {
3922                 /* Get next entry in local header offset order. */
3923                 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate(
3924                     &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT);
3925         }
3926
3927         if (zip->entry == NULL)
3928                 return ARCHIVE_EOF;
3929
3930         if (zip->entry->rsrcname.s)
3931                 rsrc = (struct zip_entry *)__archive_rb_tree_find_node(
3932                     &zip->tree_rsrc, zip->entry->rsrcname.s);
3933         else
3934                 rsrc = NULL;
3935
3936         if (zip->cctx_valid)
3937                 archive_decrypto_aes_ctr_release(&zip->cctx);
3938         if (zip->hctx_valid)
3939                 archive_hmac_sha1_cleanup(&zip->hctx);
3940         zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
3941         __archive_read_reset_passphrase(a);
3942
3943         /* File entries are sorted by the header offset, we should mostly
3944          * use __archive_read_consume to advance a read point to avoid
3945          * redundant data reading.  */
3946         offset = archive_filter_bytes(&a->archive, 0);
3947         if (offset < zip->entry->local_header_offset)
3948                 __archive_read_consume(a,
3949                     zip->entry->local_header_offset - offset);
3950         else if (offset != zip->entry->local_header_offset) {
3951                 __archive_read_seek(a, zip->entry->local_header_offset,
3952                     SEEK_SET);
3953         }
3954         zip->unconsumed = 0;
3955         r = zip_read_local_file_header(a, entry, zip);
3956         if (r != ARCHIVE_OK)
3957                 return r;
3958         if (rsrc) {
3959                 int ret2 = zip_read_mac_metadata(a, entry, rsrc);
3960                 if (ret2 < ret)
3961                         ret = ret2;
3962         }
3963         return (ret);
3964 }
3965
3966 /*
3967  * We're going to seek for the next header anyway, so we don't
3968  * need to bother doing anything here.
3969  */
3970 static int
3971 archive_read_format_zip_read_data_skip_seekable(struct archive_read *a)
3972 {
3973         struct zip *zip;
3974         zip = (struct zip *)(a->format->data);
3975
3976         zip->unconsumed = 0;
3977         return (ARCHIVE_OK);
3978 }
3979
3980 int
3981 archive_read_support_format_zip_seekable(struct archive *_a)
3982 {
3983         struct archive_read *a = (struct archive_read *)_a;
3984         struct zip *zip;
3985         int r;
3986
3987         archive_check_magic(_a, ARCHIVE_READ_MAGIC,
3988             ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable");
3989
3990         zip = (struct zip *)calloc(1, sizeof(*zip));
3991         if (zip == NULL) {
3992                 archive_set_error(&a->archive, ENOMEM,
3993                     "Can't allocate zip data");
3994                 return (ARCHIVE_FATAL);
3995         }
3996
3997 #ifdef HAVE_COPYFILE_H
3998         /* Set this by default on Mac OS. */
3999         zip->process_mac_extensions = 1;
4000 #endif
4001
4002         /*
4003          * Until enough data has been read, we cannot tell about
4004          * any encrypted entries yet.
4005          */
4006         zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
4007         zip->crc32func = real_crc32;
4008
4009         r = __archive_read_register_format(a,
4010             zip,
4011             "zip",
4012             archive_read_format_zip_seekable_bid,
4013             archive_read_format_zip_options,
4014             archive_read_format_zip_seekable_read_header,
4015             archive_read_format_zip_read_data,
4016             archive_read_format_zip_read_data_skip_seekable,
4017             NULL,
4018             archive_read_format_zip_cleanup,
4019             archive_read_support_format_zip_capabilities_seekable,
4020             archive_read_format_zip_has_encrypted_entries);
4021
4022         if (r != ARCHIVE_OK)
4023                 free(zip);
4024         return (ARCHIVE_OK);
4025 }
4026
4027 /*# vim:set noet:*/