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
  56 #include "archive.h"
  57 #include "archive_digest_private.h"
  58 #include "archive_cryptor_private.h"
  59 #include "archive_endian.h"
  60 #include "archive_entry.h"
  61 #include "archive_entry_locale.h"
  62 #include "archive_hmac_private.h"
  63 #include "archive_private.h"
  64 #include "archive_rb.h"
  65 #include "archive_read_private.h"
  66
  67 #ifndef HAVE_ZLIB_H
  68 #include "archive_crc32.h"
  69 #endif
  70
  71 struct zip_entry {
  72         struct archive_rb_node  node;
  73         struct zip_entry        *next;
  74         int64_t                 local_header_offset;
  75         int64_t                 compressed_size;
  76         int64_t                 uncompressed_size;
  77         int64_t                 gid;
  78         int64_t                 uid;
  79         struct archive_string   rsrcname;
  80         time_t                  mtime;
  81         time_t                  atime;
  82         time_t                  ctime;
  83         uint32_t                crc32;
  84         uint16_t                mode;
  85         uint16_t                zip_flags; /* From GP Flags Field */
  86         unsigned char           compression;
  87         unsigned char           system; /* From "version written by" */
  88         unsigned char           flags; /* Our extra markers. */
  89         unsigned char           decdat;/* Used for Decryption check */
  90
  91         /* WinZip AES encryption extra field should be available
  92          * when compression is 99. */
  93         struct {
  94                 /* Vendor version: AE-1 - 0x0001, AE-2 - 0x0002 */
  95                 unsigned        vendor;
  96 #define AES_VENDOR_AE_1 0x0001
  97 #define AES_VENDOR_AE_2 0x0002
  98                 /* AES encryption strength:
  99                  * 1 - 128 bits, 2 - 192 bits, 2 - 256 bits. */
 100                 unsigned        strength;
 101                 /* Actual compression method. */
 102                 unsigned char   compression;
 103         }                       aes_extra;
 104 };
 105
 106 struct trad_enc_ctx {
 107         uint32_t        keys[3];
 108 };
 109
 110 /* Bits used in zip_flags. */
 111 #define ZIP_ENCRYPTED   (1 << 0)
 112 #define ZIP_LENGTH_AT_END       (1 << 3)
 113 #define ZIP_STRONG_ENCRYPTED    (1 << 6)
 114 #define ZIP_UTF8_NAME   (1 << 11)
 115 /* See "7.2 Single Password Symmetric Encryption Method"
 116    in http://www.pkware.com/documents/casestudies/APPNOTE.TXT */
 117 #define ZIP_CENTRAL_DIRECTORY_ENCRYPTED (1 << 13)
 118
 119 /* Bits used in flags. */
 120 #define LA_USED_ZIP64   (1 << 0)
 121 #define LA_FROM_CENTRAL_DIRECTORY (1 << 1)
 122
 123 /*
 124  * See "WinZip - AES Encryption Information"
 125  *     http://www.winzip.com/aes_info.htm
 126  */
 127 /* Value used in compression method. */
 128 #define WINZIP_AES_ENCRYPTION   99
 129 /* Authentication code size. */
 130 #define AUTH_CODE_SIZE  10
 131 /**/
 132 #define MAX_DERIVED_KEY_BUF_SIZE        (AES_MAX_KEY_SIZE * 2 + 2)
 133
 134 struct zip {
 135         /* Structural information about the archive. */
 136         struct archive_string   format_name;
 137         int64_t                 central_directory_offset;
 138         size_t                  central_directory_entries_total;
 139         size_t                  central_directory_entries_on_this_disk;
 140         int                     has_encrypted_entries;
 141
 142         /* List of entries (seekable Zip only) */
 143         struct zip_entry        *zip_entries;
 144         struct archive_rb_tree  tree;
 145         struct archive_rb_tree  tree_rsrc;
 146
 147         /* Bytes read but not yet consumed via __archive_read_consume() */
 148         size_t                  unconsumed;
 149
 150         /* Information about entry we're currently reading. */
 151         struct zip_entry        *entry;
 152         int64_t                 entry_bytes_remaining;
 153
 154         /* These count the number of bytes actually read for the entry. */
 155         int64_t                 entry_compressed_bytes_read;
 156         int64_t                 entry_uncompressed_bytes_read;
 157
 158         /* Running CRC32 of the decompressed data */
 159         unsigned long           entry_crc32;
 160         unsigned long           (*crc32func)(unsigned long, const void *,
 161                                     size_t);
 162         char                    ignore_crc32;
 163
 164         /* Flags to mark progress of decompression. */
 165         char                    decompress_init;
 166         char                    end_of_entry;
 167
 168 #ifdef HAVE_ZLIB_H
 169         unsigned char           *uncompressed_buffer;
 170         size_t                  uncompressed_buffer_size;
 171         z_stream                stream;
 172         char                    stream_valid;
 173 #endif
 174
 175         struct archive_string_conv *sconv;
 176         struct archive_string_conv *sconv_default;
 177         struct archive_string_conv *sconv_utf8;
 178         int                     init_default_conversion;
 179         int                     process_mac_extensions;
 180
 181         char                    init_decryption;
 182
 183         /* Decryption buffer. */
 184         /*
 185          * The decrypted data starts at decrypted_ptr and
 186          * extends for decrypted_bytes_remaining.  Decryption
 187          * adds new data to the end of this block, data is returned
 188          * to clients from the beginning.  When the block hits the
 189          * end of decrypted_buffer, it has to be shuffled back to
 190          * the beginning of the buffer.
 191          */
 192         unsigned char           *decrypted_buffer;
 193         unsigned char           *decrypted_ptr;
 194         size_t                  decrypted_buffer_size;
 195         size_t                  decrypted_bytes_remaining;
 196         size_t                  decrypted_unconsumed_bytes;
 197
 198         /* Traditional PKWARE decryption. */
 199         struct trad_enc_ctx     tctx;
 200         char                    tctx_valid;
 201
 202         /* WinZip AES decyption. */
 203         /* Contexts used for AES decryption. */
 204         archive_crypto_ctx      cctx;
 205         char                    cctx_valid;
 206         archive_hmac_sha1_ctx   hctx;
 207         char                    hctx_valid;
 208
 209         /* Strong encryption's decryption header information. */
 210         unsigned                iv_size;
 211         unsigned                alg_id;
 212         unsigned                bit_len;
 213         unsigned                flags;
 214         unsigned                erd_size;
 215         unsigned                v_size;
 216         unsigned                v_crc32;
 217         uint8_t                 *iv;
 218         uint8_t                 *erd;
 219         uint8_t                 *v_data;
 220 };
 221
 222 /* Many systems define min or MIN, but not all. */
 223 #define zipmin(a,b) ((a) < (b) ? (a) : (b))
 224
 225 /* ------------------------------------------------------------------------ */
 226
 227 /*
 228   Traditional PKWARE Decryption functions.
 229  */
 230
 231 static void
 232 trad_enc_update_keys(struct trad_enc_ctx *ctx, uint8_t c)
 233 {
 234         uint8_t t;
 235 #define CRC32(c, b) (crc32(c ^ 0xffffffffUL, &b, 1) ^ 0xffffffffUL)
 236
 237         ctx->keys[0] = CRC32(ctx->keys[0], c);
 238         ctx->keys[1] = (ctx->keys[1] + (ctx->keys[0] & 0xff)) * 134775813L + 1;
 239         t = (ctx->keys[1] >> 24) & 0xff;
 240         ctx->keys[2] = CRC32(ctx->keys[2], t);
 241 #undef CRC32
 242 }
 243
 244 static uint8_t
 245 trad_enc_decypt_byte(struct trad_enc_ctx *ctx)
 246 {
 247         unsigned temp = ctx->keys[2] | 2;
 248         return (uint8_t)((temp * (temp ^ 1)) >> 8) & 0xff;
 249 }
 250
 251 static void
 252 trad_enc_decrypt_update(struct trad_enc_ctx *ctx, const uint8_t *in,
 253     size_t in_len, uint8_t *out, size_t out_len)
 254 {
 255         unsigned i, max;
 256
 257         max = (unsigned)((in_len < out_len)? in_len: out_len);
 258
 259         for (i = 0; i < max; i++) {
 260                 uint8_t t = in[i] ^ trad_enc_decypt_byte(ctx);
 261                 out[i] = t;
 262                 trad_enc_update_keys(ctx, t);
 263         }
 264 }
 265
 266 static int
 267 trad_enc_init(struct trad_enc_ctx *ctx, const char *pw, size_t pw_len,
 268     const uint8_t *key, size_t key_len, uint8_t *crcchk)
 269 {
 270         uint8_t header[12];
 271
 272         if (key_len < 12) {
 273                 *crcchk = 0xff;
 274                 return -1;
 275         }
 276
 277         ctx->keys[0] = 305419896L;
 278         ctx->keys[1] = 591751049L;
 279         ctx->keys[2] = 878082192L;
 280
 281         for (;pw_len; --pw_len)
 282                 trad_enc_update_keys(ctx, *pw++);
 283
 284         trad_enc_decrypt_update(ctx, key, 12, header, 12);
 285         /* Return the last byte for CRC check. */
 286         *crcchk = header[11];
 287         return 0;
 288 }
 289
 290 #if 0
 291 static void
 292 crypt_derive_key_sha1(const void *p, int size, unsigned char *key,
 293     int key_size)
 294 {
 295 #define MD_SIZE 20
 296         archive_sha1_ctx ctx;
 297         unsigned char md1[MD_SIZE];
 298         unsigned char md2[MD_SIZE * 2];
 299         unsigned char mkb[64];
 300         int i;
 301
 302         archive_sha1_init(&ctx);
 303         archive_sha1_update(&ctx, p, size);
 304         archive_sha1_final(&ctx, md1);
 305
 306         memset(mkb, 0x36, sizeof(mkb));
 307         for (i = 0; i < MD_SIZE; i++)
 308                 mkb[i] ^= md1[i];
 309         archive_sha1_init(&ctx);
 310         archive_sha1_update(&ctx, mkb, sizeof(mkb));
 311         archive_sha1_final(&ctx, md2);
 312
 313         memset(mkb, 0x5C, sizeof(mkb));
 314         for (i = 0; i < MD_SIZE; i++)
 315                 mkb[i] ^= md1[i];
 316         archive_sha1_init(&ctx);
 317         archive_sha1_update(&ctx, mkb, sizeof(mkb));
 318         archive_sha1_final(&ctx, md2 + MD_SIZE);
 319
 320         if (key_size > 32)
 321                 key_size = 32;
 322         memcpy(key, md2, key_size);
 323 #undef MD_SIZE
 324 }
 325 #endif
 326
 327 /*
 328  * Common code for streaming or seeking modes.
 329  *
 330  * Includes code to read local file headers, decompress data
 331  * from entry bodies, and common API.
 332  */
 333
 334 static unsigned long
 335 real_crc32(unsigned long crc, const void *buff, size_t len)
 336 {
 337         return crc32(crc, buff, (unsigned int)len);
 338 }
 339
 340 /* Used by "ignorecrc32" option to speed up tests. */
 341 static unsigned long
 342 fake_crc32(unsigned long crc, const void *buff, size_t len)
 343 {
 344         (void)crc; /* UNUSED */
 345         (void)buff; /* UNUSED */
 346         (void)len; /* UNUSED */
 347         return 0;
 348 }
 349
 350 static struct {
 351         int id;
 352         const char * name;
 353 } compression_methods[] = {
 354         {0, "uncompressed"}, /* The file is stored (no compression) */
 355         {1, "shrinking"}, /* The file is Shrunk */
 356         {2, "reduced-1"}, /* The file is Reduced with compression factor 1 */
 357         {3, "reduced-2"}, /* The file is Reduced with compression factor 2 */
 358         {4, "reduced-3"}, /* The file is Reduced with compression factor 3 */
 359         {5, "reduced-4"}, /* The file is Reduced with compression factor 4 */
 360         {6, "imploded"},  /* The file is Imploded */
 361         {7, "reserved"},  /* Reserved for Tokenizing compression algorithm */
 362         {8, "deflation"}, /* The file is Deflated */
 363         {9, "deflation-64-bit"}, /* Enhanced Deflating using Deflate64(tm) */
 364         {10, "ibm-terse"},/* PKWARE Data Compression Library Imploding
 365                            * (old IBM TERSE) */
 366         {11, "reserved"}, /* Reserved by PKWARE */
 367         {12, "bzip"},     /* File is compressed using BZIP2 algorithm */
 368         {13, "reserved"}, /* Reserved by PKWARE */
 369         {14, "lzma"},     /* LZMA (EFS) */
 370         {15, "reserved"}, /* Reserved by PKWARE */
 371         {16, "reserved"}, /* Reserved by PKWARE */
 372         {17, "reserved"}, /* Reserved by PKWARE */
 373         {18, "ibm-terse-new"}, /* File is compressed using IBM TERSE (new) */
 374         {19, "ibm-lz777"},/* IBM LZ77 z Architecture (PFS) */
 375         {97, "wav-pack"}, /* WavPack compressed data */
 376         {98, "ppmd-1"},   /* PPMd version I, Rev 1 */
 377         {99, "aes"}       /* WinZip AES encryption  */
 378 };
 379
 380 static const char *
 381 compression_name(const int compression)
 382 {
 383         static const int num_compression_methods =
 384                 sizeof(compression_methods)/sizeof(compression_methods[0]);
 385         int i=0;
 386
 387         while(compression >= 0 && i < num_compression_methods) {
 388                 if (compression_methods[i].id == compression)
 389                         return compression_methods[i].name;
 390                 i++;
 391         }
 392         return "??";
 393 }
 394
 395 /* Convert an MSDOS-style date/time into Unix-style time. */
 396 static time_t
 397 zip_time(const char *p)
 398 {
 399         int msTime, msDate;
 400         struct tm ts;
 401
 402         msTime = (0xff & (unsigned)p[0]) + 256 * (0xff & (unsigned)p[1]);
 403         msDate = (0xff & (unsigned)p[2]) + 256 * (0xff & (unsigned)p[3]);
 404
 405         memset(&ts, 0, sizeof(ts));
 406         ts.tm_year = ((msDate >> 9) & 0x7f) + 80; /* Years since 1900. */
 407         ts.tm_mon = ((msDate >> 5) & 0x0f) - 1; /* Month number. */
 408         ts.tm_mday = msDate & 0x1f; /* Day of month. */
 409         ts.tm_hour = (msTime >> 11) & 0x1f;
 410         ts.tm_min = (msTime >> 5) & 0x3f;
 411         ts.tm_sec = (msTime << 1) & 0x3e;
 412         ts.tm_isdst = -1;
 413         return mktime(&ts);
 414 }
 415
 416 /*
 417  * The extra data is stored as a list of
 418  *      id1+size1+data1 + id2+size2+data2 ...
 419  *  triplets.  id and size are 2 bytes each.
 420  */
 421 static int
 422 process_extra(struct archive_read *a, const char *p, size_t extra_length, struct zip_entry* zip_entry)
 423 {
 424         unsigned offset = 0;
 425
 426         if (extra_length == 0) {
 427                 return ARCHIVE_OK;
 428         }
 429
 430         if (extra_length < 4) {
 431                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 432                     "Too-small extra data: Need at least 4 bytes, but only found %d bytes", (int)extra_length);
 433                 return ARCHIVE_FAILED;
 434         }
 435         while (offset <= extra_length - 4) {
 436                 unsigned short headerid = archive_le16dec(p + offset);
 437                 unsigned short datasize = archive_le16dec(p + offset + 2);
 438
 439                 offset += 4;
 440                 if (offset + datasize > extra_length) {
 441                         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 442                             "Extra data overflow: Need %d bytes but only found %d bytes",
 443                             (int)datasize, (int)(extra_length - offset));
 444                         return ARCHIVE_FAILED;
 445                 }
 446 #ifdef DEBUG
 447                 fprintf(stderr, "Header id 0x%04x, length %d\n",
 448                     headerid, datasize);
 449 #endif
 450                 switch (headerid) {
 451                 case 0x0001:
 452                         /* Zip64 extended information extra field. */
 453                         zip_entry->flags |= LA_USED_ZIP64;
 454                         if (zip_entry->uncompressed_size == 0xffffffff) {
 455                                 if (datasize < 8)
 456                                         break;
 457                                 zip_entry->uncompressed_size =
 458                                     archive_le64dec(p + offset);
 459                                 offset += 8;
 460                                 datasize -= 8;
 461                         }
 462                         if (zip_entry->compressed_size == 0xffffffff) {
 463                                 if (datasize < 8)
 464                                         break;
 465                                 zip_entry->compressed_size =
 466                                     archive_le64dec(p + offset);
 467                                 offset += 8;
 468                                 datasize -= 8;
 469                         }
 470                         if (zip_entry->local_header_offset == 0xffffffff) {
 471                                 if (datasize < 8)
 472                                         break;
 473                                 zip_entry->local_header_offset =
 474                                     archive_le64dec(p + offset);
 475                                 offset += 8;
 476                                 datasize -= 8;
 477                         }
 478                         /* archive_le32dec(p + offset) gives disk
 479                          * on which file starts, but we don't handle
 480                          * multi-volume Zip files. */
 481                         break;
 482 #ifdef DEBUG
 483                 case 0x0017:
 484                 {
 485                         /* Strong encryption field. */
 486                         if (archive_le16dec(p + offset) == 2) {
 487                                 unsigned algId =
 488                                         archive_le16dec(p + offset + 2);
 489                                 unsigned bitLen =
 490                                         archive_le16dec(p + offset + 4);
 491                                 int      flags =
 492                                         archive_le16dec(p + offset + 6);
 493                                 fprintf(stderr, "algId=0x%04x, bitLen=%u, "
 494                                     "flgas=%d\n", algId, bitLen,flags);
 495                         }
 496                         break;
 497                 }
 498 #endif
 499                 case 0x5455:
 500                 {
 501                         /* Extended time field "UT". */
 502                         int flags = p[offset];
 503                         offset++;
 504                         datasize--;
 505                         /* Flag bits indicate which dates are present. */
 506                         if (flags & 0x01)
 507                         {
 508 #ifdef DEBUG
 509                                 fprintf(stderr, "mtime: %lld -> %d\n",
 510                                     (long long)zip_entry->mtime,
 511                                     archive_le32dec(p + offset));
 512 #endif
 513                                 if (datasize < 4)
 514                                         break;
 515                                 zip_entry->mtime = archive_le32dec(p + offset);
 516                                 offset += 4;
 517                                 datasize -= 4;
 518                         }
 519                         if (flags & 0x02)
 520                         {
 521                                 if (datasize < 4)
 522                                         break;
 523                                 zip_entry->atime = archive_le32dec(p + offset);
 524                                 offset += 4;
 525                                 datasize -= 4;
 526                         }
 527                         if (flags & 0x04)
 528                         {
 529                                 if (datasize < 4)
 530                                         break;
 531                                 zip_entry->ctime = archive_le32dec(p + offset);
 532                                 offset += 4;
 533                                 datasize -= 4;
 534                         }
 535                         break;
 536                 }
 537                 case 0x5855:
 538                 {
 539                         /* Info-ZIP Unix Extra Field (old version) "UX". */
 540                         if (datasize >= 8) {
 541                                 zip_entry->atime = archive_le32dec(p + offset);
 542                                 zip_entry->mtime =
 543                                     archive_le32dec(p + offset + 4);
 544                         }
 545                         if (datasize >= 12) {
 546                                 zip_entry->uid =
 547                                     archive_le16dec(p + offset + 8);
 548                                 zip_entry->gid =
 549                                     archive_le16dec(p + offset + 10);
 550                         }
 551                         break;
 552                 }
 553                 case 0x6c78:
 554                 {
 555                         /* Experimental 'xl' field */
 556                         /*
 557                          * Introduced Dec 2013 to provide a way to
 558                          * include external file attributes (and other
 559                          * fields that ordinarily appear only in
 560                          * central directory) in local file header.
 561                          * This provides file type and permission
 562                          * information necessary to support full
 563                          * streaming extraction.  Currently being
 564                          * discussed with other Zip developers
 565                          * ... subject to change.
 566                          *
 567                          * Format:
 568                          *  The field starts with a bitmap that specifies
 569                          *  which additional fields are included.  The
 570                          *  bitmap is variable length and can be extended in
 571                          *  the future.
 572                          *
 573                          *  n bytes - feature bitmap: first byte has low-order
 574                          *    7 bits.  If high-order bit is set, a subsequent
 575                          *    byte holds the next 7 bits, etc.
 576                          *
 577                          *  if bitmap & 1, 2 byte "version made by"
 578                          *  if bitmap & 2, 2 byte "internal file attributes"
 579                          *  if bitmap & 4, 4 byte "external file attributes"
 580                          *  if bitmap & 8, 2 byte comment length + n byte comment
 581                          */
 582                         int bitmap, bitmap_last;
 583
 584                         if (datasize < 1)
 585                                 break;
 586                         bitmap_last = bitmap = 0xff & p[offset];
 587                         offset += 1;
 588                         datasize -= 1;
 589
 590                         /* We only support first 7 bits of bitmap; skip rest. */
 591                         while ((bitmap_last & 0x80) != 0
 592                             && datasize >= 1) {
 593                                 bitmap_last = p[offset];
 594                                 offset += 1;
 595                                 datasize -= 1;
 596                         }
 597
 598                         if (bitmap & 1) {
 599                                 /* 2 byte "version made by" */
 600                                 if (datasize < 2)
 601                                         break;
 602                                 zip_entry->system
 603                                     = archive_le16dec(p + offset) >> 8;
 604                                 offset += 2;
 605                                 datasize -= 2;
 606                         }
 607                         if (bitmap & 2) {
 608                                 /* 2 byte "internal file attributes" */
 609                                 uint32_t internal_attributes;
 610                                 if (datasize < 2)
 611                                         break;
 612                                 internal_attributes
 613                                     = archive_le16dec(p + offset);
 614                                 /* Not used by libarchive at present. */
 615                                 (void)internal_attributes; /* UNUSED */
 616                                 offset += 2;
 617                                 datasize -= 2;
 618                         }
 619                         if (bitmap & 4) {
 620                                 /* 4 byte "external file attributes" */
 621                                 uint32_t external_attributes;
 622                                 if (datasize < 4)
 623                                         break;
 624                                 external_attributes
 625                                     = archive_le32dec(p + offset);
 626                                 if (zip_entry->system == 3) {
 627                                         zip_entry->mode
 628                                             = external_attributes >> 16;
 629                                 } else if (zip_entry->system == 0) {
 630                                         // Interpret MSDOS directory bit
 631                                         if (0x10 == (external_attributes & 0x10)) {
 632                                                 zip_entry->mode = AE_IFDIR | 0775;
 633                                         } else {
 634                                                 zip_entry->mode = AE_IFREG | 0664;
 635                                         }
 636                                         if (0x01 == (external_attributes & 0x01)) {
 637                                                 // Read-only bit; strip write permissions
 638                                                 zip_entry->mode &= 0555;
 639                                         }
 640                                 } else {
 641                                         zip_entry->mode = 0;
 642                                 }
 643                                 offset += 4;
 644                                 datasize -= 4;
 645                         }
 646                         if (bitmap & 8) {
 647                                 /* 2 byte comment length + comment */
 648                                 uint32_t comment_length;
 649                                 if (datasize < 2)
 650                                         break;
 651                                 comment_length
 652                                     = archive_le16dec(p + offset);
 653                                 offset += 2;
 654                                 datasize -= 2;
 655
 656                                 if (datasize < comment_length)
 657                                         break;
 658                                 /* Comment is not supported by libarchive */
 659                                 offset += comment_length;
 660                                 datasize -= comment_length;
 661                         }
 662                         break;
 663                 }
 664                 case 0x7855:
 665                         /* Info-ZIP Unix Extra Field (type 2) "Ux". */
 666 #ifdef DEBUG
 667                         fprintf(stderr, "uid %d gid %d\n",
 668                             archive_le16dec(p + offset),
 669                             archive_le16dec(p + offset + 2));
 670 #endif
 671                         if (datasize >= 2)
 672                                 zip_entry->uid = archive_le16dec(p + offset);
 673                         if (datasize >= 4)
 674                                 zip_entry->gid =
 675                                     archive_le16dec(p + offset + 2);
 676                         break;
 677                 case 0x7875:
 678                 {
 679                         /* Info-Zip Unix Extra Field (type 3) "ux". */
 680                         int uidsize = 0, gidsize = 0;
 681
 682                         /* TODO: support arbitrary uidsize/gidsize. */
 683                         if (datasize >= 1 && p[offset] == 1) {/* version=1 */
 684                                 if (datasize >= 4) {
 685                                         /* get a uid size. */
 686                                         uidsize = 0xff & (int)p[offset+1];
 687                                         if (uidsize == 2)
 688                                                 zip_entry->uid =
 689                                                     archive_le16dec(
 690                                                         p + offset + 2);
 691                                         else if (uidsize == 4 && datasize >= 6)
 692                                                 zip_entry->uid =
 693                                                     archive_le32dec(
 694                                                         p + offset + 2);
 695                                 }
 696                                 if (datasize >= (2 + uidsize + 3)) {
 697                                         /* get a gid size. */
 698                                         gidsize = 0xff & (int)p[offset+2+uidsize];
 699                                         if (gidsize == 2)
 700                                                 zip_entry->gid =
 701                                                     archive_le16dec(
 702                                                         p+offset+2+uidsize+1);
 703                                         else if (gidsize == 4 &&
 704                                             datasize >= (2 + uidsize + 5))
 705                                                 zip_entry->gid =
 706                                                     archive_le32dec(
 707                                                         p+offset+2+uidsize+1);
 708                                 }
 709                         }
 710                         break;
 711                 }
 712                 case 0x9901:
 713                         /* WinZIp AES extra data field. */
 714                         if (p[offset + 2] == 'A' && p[offset + 3] == 'E') {
 715                                 /* Vendor version. */
 716                                 zip_entry->aes_extra.vendor =
 717                                     archive_le16dec(p + offset);
 718                                 /* AES encryption strength. */
 719                                 zip_entry->aes_extra.strength = p[offset + 4];
 720                                 /* Actual compression method. */
 721                                 zip_entry->aes_extra.compression =
 722                                     p[offset + 5];
 723                         }
 724                         break;
 725                 default:
 726                         break;
 727                 }
 728                 offset += datasize;
 729         }
 730         if (offset != extra_length) {
 731                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 732                     "Malformed extra data: Consumed %d bytes of %d bytes",
 733                     (int)offset, (int)extra_length);
 734                 return ARCHIVE_FAILED;
 735         }
 736         return ARCHIVE_OK;
 737 }
 738
 739 /*
 740  * Assumes file pointer is at beginning of local file header.
 741  */
 742 static int
 743 zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry,
 744     struct zip *zip)
 745 {
 746         const char *p;
 747         const void *h;
 748         const wchar_t *wp;
 749         const char *cp;
 750         size_t len, filename_length, extra_length;
 751         struct archive_string_conv *sconv;
 752         struct zip_entry *zip_entry = zip->entry;
 753         struct zip_entry zip_entry_central_dir;
 754         int ret = ARCHIVE_OK;
 755         char version;
 756
 757         /* Save a copy of the original for consistency checks. */
 758         zip_entry_central_dir = *zip_entry;
 759
 760         zip->decompress_init = 0;
 761         zip->end_of_entry = 0;
 762         zip->entry_uncompressed_bytes_read = 0;
 763         zip->entry_compressed_bytes_read = 0;
 764         zip->entry_crc32 = zip->crc32func(0, NULL, 0);
 765
 766         /* Setup default conversion. */
 767         if (zip->sconv == NULL && !zip->init_default_conversion) {
 768                 zip->sconv_default =
 769                     archive_string_default_conversion_for_read(&(a->archive));
 770                 zip->init_default_conversion = 1;
 771         }
 772
 773         if ((p = __archive_read_ahead(a, 30, NULL)) == NULL) {
 774                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 775                     "Truncated ZIP file header");
 776                 return (ARCHIVE_FATAL);
 777         }
 778
 779         if (memcmp(p, "PK\003\004", 4) != 0) {
 780                 archive_set_error(&a->archive, -1, "Damaged Zip archive");
 781                 return ARCHIVE_FATAL;
 782         }
 783         version = p[4];
 784         zip_entry->system = p[5];
 785         zip_entry->zip_flags = archive_le16dec(p + 6);
 786         if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) {
 787                 zip->has_encrypted_entries = 1;
 788                 archive_entry_set_is_data_encrypted(entry, 1);
 789                 if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED &&
 790                         zip_entry->zip_flags & ZIP_ENCRYPTED &&
 791                         zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) {
 792                         archive_entry_set_is_metadata_encrypted(entry, 1);
 793                         return ARCHIVE_FATAL;
 794                 }
 795         }
 796         zip->init_decryption = (zip_entry->zip_flags & ZIP_ENCRYPTED);
 797         zip_entry->compression = (char)archive_le16dec(p + 8);
 798         zip_entry->mtime = zip_time(p + 10);
 799         zip_entry->crc32 = archive_le32dec(p + 14);
 800         if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
 801                 zip_entry->decdat = p[11];
 802         else
 803                 zip_entry->decdat = p[17];
 804         zip_entry->compressed_size = archive_le32dec(p + 18);
 805         zip_entry->uncompressed_size = archive_le32dec(p + 22);
 806         filename_length = archive_le16dec(p + 26);
 807         extra_length = archive_le16dec(p + 28);
 808
 809         __archive_read_consume(a, 30);
 810
 811         /* Read the filename. */
 812         if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) {
 813                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 814                     "Truncated ZIP file header");
 815                 return (ARCHIVE_FATAL);
 816         }
 817         if (zip_entry->zip_flags & ZIP_UTF8_NAME) {
 818                 /* The filename is stored to be UTF-8. */
 819                 if (zip->sconv_utf8 == NULL) {
 820                         zip->sconv_utf8 =
 821                             archive_string_conversion_from_charset(
 822                                 &a->archive, "UTF-8", 1);
 823                         if (zip->sconv_utf8 == NULL)
 824                                 return (ARCHIVE_FATAL);
 825                 }
 826                 sconv = zip->sconv_utf8;
 827         } else if (zip->sconv != NULL)
 828                 sconv = zip->sconv;
 829         else
 830                 sconv = zip->sconv_default;
 831
 832         if (archive_entry_copy_pathname_l(entry,
 833             h, filename_length, sconv) != 0) {
 834                 if (errno == ENOMEM) {
 835                         archive_set_error(&a->archive, ENOMEM,
 836                             "Can't allocate memory for Pathname");
 837                         return (ARCHIVE_FATAL);
 838                 }
 839                 archive_set_error(&a->archive,
 840                     ARCHIVE_ERRNO_FILE_FORMAT,
 841                     "Pathname cannot be converted "
 842                     "from %s to current locale.",
 843                     archive_string_conversion_charset_name(sconv));
 844                 ret = ARCHIVE_WARN;
 845         }
 846         __archive_read_consume(a, filename_length);
 847
 848         /* Read the extra data. */
 849         if ((h = __archive_read_ahead(a, extra_length, NULL)) == NULL) {
 850                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
 851                     "Truncated ZIP file header");
 852                 return (ARCHIVE_FATAL);
 853         }
 854
 855         if (ARCHIVE_OK != process_extra(a, h, extra_length, zip_entry)) {
 856                 return ARCHIVE_FATAL;
 857         }
 858         __archive_read_consume(a, extra_length);
 859
 860         /* Work around a bug in Info-Zip: When reading from a pipe, it
 861          * stats the pipe instead of synthesizing a file entry. */
 862         if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) {
 863                 zip_entry->mode &= ~ AE_IFMT;
 864                 zip_entry->mode |= AE_IFREG;
 865         }
 866
 867         if ((zip_entry->mode & AE_IFMT) == 0) {
 868                 /* Especially in streaming mode, we can end up
 869                    here without having seen proper mode information.
 870                    Guess from the filename. */
 871                 wp = archive_entry_pathname_w(entry);
 872                 if (wp != NULL) {
 873                         len = wcslen(wp);
 874                         if (len > 0 && wp[len - 1] == L'/')
 875                                 zip_entry->mode |= AE_IFDIR;
 876                         else
 877                                 zip_entry->mode |= AE_IFREG;
 878                 } else {
 879                         cp = archive_entry_pathname(entry);
 880                         len = (cp != NULL)?strlen(cp):0;
 881                         if (len > 0 && cp[len - 1] == '/')
 882                                 zip_entry->mode |= AE_IFDIR;
 883                         else
 884                                 zip_entry->mode |= AE_IFREG;
 885                 }
 886                 if (zip_entry->mode == AE_IFDIR) {
 887                         zip_entry->mode |= 0775;
 888                 } else if (zip_entry->mode == AE_IFREG) {
 889                         zip_entry->mode |= 0664;
 890                 }
 891         }
 892
 893         /* Make sure directories end in '/' */
 894         if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) {
 895                 wp = archive_entry_pathname_w(entry);
 896                 if (wp != NULL) {
 897                         len = wcslen(wp);
 898                         if (len > 0 && wp[len - 1] != L'/') {
 899                                 struct archive_wstring s;
 900                                 archive_string_init(&s);
 901                                 archive_wstrcat(&s, wp);
 902                                 archive_wstrappend_wchar(&s, L'/');
 903                                 archive_entry_copy_pathname_w(entry, s.s);
 904                         }
 905                 } else {
 906                         cp = archive_entry_pathname(entry);
 907                         len = (cp != NULL)?strlen(cp):0;
 908                         if (len > 0 && cp[len - 1] != '/') {
 909                                 struct archive_string s;
 910                                 archive_string_init(&s);
 911                                 archive_strcat(&s, cp);
 912                                 archive_strappend_char(&s, '/');
 913                                 archive_entry_set_pathname(entry, s.s);
 914                         }
 915                 }
 916         }
 917
 918         if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) {
 919                 /* If this came from the central dir, it's size info
 920                  * is definitive, so ignore the length-at-end flag. */
 921                 zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END;
 922                 /* If local header is missing a value, use the one from
 923                    the central directory.  If both have it, warn about
 924                    mismatches. */
 925                 if (zip_entry->crc32 == 0) {
 926                         zip_entry->crc32 = zip_entry_central_dir.crc32;
 927                 } else if (!zip->ignore_crc32
 928                     && zip_entry->crc32 != zip_entry_central_dir.crc32) {
 929                         archive_set_error(&a->archive,
 930                             ARCHIVE_ERRNO_FILE_FORMAT,
 931                             "Inconsistent CRC32 values");
 932                         ret = ARCHIVE_WARN;
 933                 }
 934                 if (zip_entry->compressed_size == 0) {
 935                         zip_entry->compressed_size
 936                             = zip_entry_central_dir.compressed_size;
 937                 } else if (zip_entry->compressed_size
 938                     != zip_entry_central_dir.compressed_size) {
 939                         archive_set_error(&a->archive,
 940                             ARCHIVE_ERRNO_FILE_FORMAT,
 941                             "Inconsistent compressed size: "
 942                             "%jd in central directory, %jd in local header",
 943                             (intmax_t)zip_entry_central_dir.compressed_size,
 944                             (intmax_t)zip_entry->compressed_size);
 945                         ret = ARCHIVE_WARN;
 946                 }
 947                 if (zip_entry->uncompressed_size == 0) {
 948                         zip_entry->uncompressed_size
 949                             = zip_entry_central_dir.uncompressed_size;
 950                 } else if (zip_entry->uncompressed_size
 951                     != zip_entry_central_dir.uncompressed_size) {
 952                         archive_set_error(&a->archive,
 953                             ARCHIVE_ERRNO_FILE_FORMAT,
 954                             "Inconsistent uncompressed size: "
 955                             "%jd in central directory, %jd in local header",
 956                             (intmax_t)zip_entry_central_dir.uncompressed_size,
 957                             (intmax_t)zip_entry->uncompressed_size);
 958                         ret = ARCHIVE_WARN;
 959                 }
 960         }
 961
 962         /* Populate some additional entry fields: */
 963         archive_entry_set_mode(entry, zip_entry->mode);
 964         archive_entry_set_uid(entry, zip_entry->uid);
 965         archive_entry_set_gid(entry, zip_entry->gid);
 966         archive_entry_set_mtime(entry, zip_entry->mtime, 0);
 967         archive_entry_set_ctime(entry, zip_entry->ctime, 0);
 968         archive_entry_set_atime(entry, zip_entry->atime, 0);
 969
 970         if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) {
 971                 size_t linkname_length;
 972
 973                 if (zip_entry->compressed_size > 64 * 1024) {
 974                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 975                             "Zip file with oversized link entry");
 976                         return ARCHIVE_FATAL;
 977                 }
 978
 979                 linkname_length = (size_t)zip_entry->compressed_size;
 980
 981                 archive_entry_set_size(entry, 0);
 982                 p = __archive_read_ahead(a, linkname_length, NULL);
 983                 if (p == NULL) {
 984                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 985                             "Truncated Zip file");
 986                         return ARCHIVE_FATAL;
 987                 }
 988
 989                 sconv = zip->sconv;
 990                 if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME))
 991                         sconv = zip->sconv_utf8;
 992                 if (sconv == NULL)
 993                         sconv = zip->sconv_default;
 994                 if (archive_entry_copy_symlink_l(entry, p, linkname_length,
 995                     sconv) != 0) {
 996                         if (errno != ENOMEM && sconv == zip->sconv_utf8 &&
 997                             (zip->entry->zip_flags & ZIP_UTF8_NAME))
 998                             archive_entry_copy_symlink_l(entry, p,
 999                                 linkname_length, NULL);
1000                         if (errno == ENOMEM) {
1001                                 archive_set_error(&a->archive, ENOMEM,
1002                                     "Can't allocate memory for Symlink");
1003                                 return (ARCHIVE_FATAL);
1004                         }
1005                         /*
1006                          * Since there is no character-set regulation for
1007                          * symlink name, do not report the conversion error
1008                          * in an automatic conversion.
1009                          */
1010                         if (sconv != zip->sconv_utf8 ||
1011                             (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) {
1012                                 archive_set_error(&a->archive,
1013                                     ARCHIVE_ERRNO_FILE_FORMAT,
1014                                     "Symlink cannot be converted "
1015                                     "from %s to current locale.",
1016                                     archive_string_conversion_charset_name(
1017                                         sconv));
1018                                 ret = ARCHIVE_WARN;
1019                         }
1020                 }
1021                 zip_entry->uncompressed_size = zip_entry->compressed_size = 0;
1022
1023                 if (__archive_read_consume(a, linkname_length) < 0) {
1024                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1025                             "Read error skipping symlink target name");
1026                         return ARCHIVE_FATAL;
1027                 }
1028         } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1029             || zip_entry->uncompressed_size > 0) {
1030                 /* Set the size only if it's meaningful. */
1031                 archive_entry_set_size(entry, zip_entry->uncompressed_size);
1032         }
1033         zip->entry_bytes_remaining = zip_entry->compressed_size;
1034
1035         /* If there's no body, force read_data() to return EOF immediately. */
1036         if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1037             && zip->entry_bytes_remaining < 1)
1038                 zip->end_of_entry = 1;
1039
1040         /* Set up a more descriptive format name. */
1041         archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)",
1042             version / 10, version % 10,
1043             compression_name(zip->entry->compression));
1044         a->archive.archive_format_name = zip->format_name.s;
1045
1046         return (ret);
1047 }
1048
1049 static int
1050 check_authentication_code(struct archive_read *a, const void *_p)
1051 {
1052         struct zip *zip = (struct zip *)(a->format->data);
1053
1054         /* Check authentication code. */
1055         if (zip->hctx_valid) {
1056                 const void *p;
1057                 uint8_t hmac[20];
1058                 size_t hmac_len = 20;
1059                 int cmp;
1060
1061                 archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len);
1062                 if (_p == NULL) {
1063                         /* Read authentication code. */
1064                         p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL);
1065                         if (p == NULL) {
1066                                 archive_set_error(&a->archive,
1067                                     ARCHIVE_ERRNO_FILE_FORMAT,
1068                                     "Truncated ZIP file data");
1069                                 return (ARCHIVE_FATAL);
1070                         }
1071                 } else {
1072                         p = _p;
1073                 }
1074                 cmp = memcmp(hmac, p, AUTH_CODE_SIZE);
1075                 __archive_read_consume(a, AUTH_CODE_SIZE);
1076                 if (cmp != 0) {
1077                         archive_set_error(&a->archive,
1078                             ARCHIVE_ERRNO_MISC,
1079                             "ZIP bad Authentication code");
1080                         return (ARCHIVE_WARN);
1081                 }
1082         }
1083         return (ARCHIVE_OK);
1084 }
1085
1086 /*
1087  * Read "uncompressed" data.  There are three cases:
1088  *  1) We know the size of the data.  This is always true for the
1089  * seeking reader (we've examined the Central Directory already).
1090  *  2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred.
1091  * Info-ZIP seems to do this; we know the size but have to grab
1092  * the CRC from the data descriptor afterwards.
1093  *  3) We're streaming and ZIP_LENGTH_AT_END was specified and
1094  * we have no size information.  In this case, we can do pretty
1095  * well by watching for the data descriptor record.  The data
1096  * descriptor is 16 bytes and includes a computed CRC that should
1097  * provide a strong check.
1098  *
1099  * TODO: Technically, the PK\007\010 signature is optional.
1100  * In the original spec, the data descriptor contained CRC
1101  * and size fields but had no leading signature.  In practice,
1102  * newer writers seem to provide the signature pretty consistently.
1103  *
1104  * For uncompressed data, the PK\007\010 marker seems essential
1105  * to be sure we've actually seen the end of the entry.
1106  *
1107  * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets
1108  * zip->end_of_entry if it consumes all of the data.
1109  */
1110 static int
1111 zip_read_data_none(struct archive_read *a, const void **_buff,
1112     size_t *size, int64_t *offset)
1113 {
1114         struct zip *zip;
1115         const char *buff;
1116         ssize_t bytes_avail;
1117         int r;
1118
1119         (void)offset; /* UNUSED */
1120
1121         zip = (struct zip *)(a->format->data);
1122
1123         if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) {
1124                 const char *p;
1125                 ssize_t grabbing_bytes = 24;
1126
1127                 if (zip->hctx_valid)
1128                         grabbing_bytes += AUTH_CODE_SIZE;
1129                 /* Grab at least 24 bytes. */
1130                 buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail);
1131                 if (bytes_avail < grabbing_bytes) {
1132                         /* Zip archives have end-of-archive markers
1133                            that are longer than this, so a failure to get at
1134                            least 24 bytes really does indicate a truncated
1135                            file. */
1136                         archive_set_error(&a->archive,
1137                             ARCHIVE_ERRNO_FILE_FORMAT,
1138                             "Truncated ZIP file data");
1139                         return (ARCHIVE_FATAL);
1140                 }
1141                 /* Check for a complete PK\007\010 signature, followed
1142                  * by the correct 4-byte CRC. */
1143                 p = buff;
1144                 if (zip->hctx_valid)
1145                         p += AUTH_CODE_SIZE;
1146                 if (p[0] == 'P' && p[1] == 'K'
1147                     && p[2] == '\007' && p[3] == '\010'
1148                     && (archive_le32dec(p + 4) == zip->entry_crc32
1149                         || zip->ignore_crc32
1150                         || (zip->hctx_valid
1151                          && zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) {
1152                         if (zip->entry->flags & LA_USED_ZIP64) {
1153                                 zip->entry->crc32 = archive_le32dec(p + 4);
1154                                 zip->entry->compressed_size =
1155                                         archive_le64dec(p + 8);
1156                                 zip->entry->uncompressed_size =
1157                                         archive_le64dec(p + 16);
1158                                 zip->unconsumed = 24;
1159                         } else {
1160                                 zip->entry->crc32 = archive_le32dec(p + 4);
1161                                 zip->entry->compressed_size =
1162                                         archive_le32dec(p + 8);
1163                                 zip->entry->uncompressed_size =
1164                                         archive_le32dec(p + 12);
1165                                 zip->unconsumed = 16;
1166                         }
1167                         if (zip->hctx_valid) {
1168                                 r = check_authentication_code(a, buff);
1169                                 if (r != ARCHIVE_OK)
1170                                         return (r);
1171                         }
1172                         zip->end_of_entry = 1;
1173                         return (ARCHIVE_OK);
1174                 }
1175                 /* If not at EOF, ensure we consume at least one byte. */
1176                 ++p;
1177
1178                 /* Scan forward until we see where a PK\007\010 signature
1179                  * might be. */
1180                 /* Return bytes up until that point.  On the next call,
1181                  * the code above will verify the data descriptor. */
1182                 while (p < buff + bytes_avail - 4) {
1183                         if (p[3] == 'P') { p += 3; }
1184                         else if (p[3] == 'K') { p += 2; }
1185                         else if (p[3] == '\007') { p += 1; }
1186                         else if (p[3] == '\010' && p[2] == '\007'
1187                             && p[1] == 'K' && p[0] == 'P') {
1188                                 if (zip->hctx_valid)
1189                                         p -= AUTH_CODE_SIZE;
1190                                 break;
1191                         } else { p += 4; }
1192                 }
1193                 bytes_avail = p - buff;
1194         } else {
1195                 if (zip->entry_bytes_remaining == 0) {
1196                         zip->end_of_entry = 1;
1197                         if (zip->hctx_valid) {
1198                                 r = check_authentication_code(a, NULL);
1199                                 if (r != ARCHIVE_OK)
1200                                         return (r);
1201                         }
1202                         return (ARCHIVE_OK);
1203                 }
1204                 /* Grab a bunch of bytes. */
1205                 buff = __archive_read_ahead(a, 1, &bytes_avail);
1206                 if (bytes_avail <= 0) {
1207                         archive_set_error(&a->archive,
1208                             ARCHIVE_ERRNO_FILE_FORMAT,
1209                             "Truncated ZIP file data");
1210                         return (ARCHIVE_FATAL);
1211                 }
1212                 if (bytes_avail > zip->entry_bytes_remaining)
1213                         bytes_avail = (ssize_t)zip->entry_bytes_remaining;
1214         }
1215         if (zip->tctx_valid || zip->cctx_valid) {
1216                 size_t dec_size = bytes_avail;
1217
1218                 if (dec_size > zip->decrypted_buffer_size)
1219                         dec_size = zip->decrypted_buffer_size;
1220                 if (zip->tctx_valid) {
1221                         trad_enc_decrypt_update(&zip->tctx,
1222                             (const uint8_t *)buff, dec_size,
1223                             zip->decrypted_buffer, dec_size);
1224                 } else {
1225                         size_t dsize = dec_size;
1226                         archive_hmac_sha1_update(&zip->hctx,
1227                             (const uint8_t *)buff, dec_size);
1228                         archive_decrypto_aes_ctr_update(&zip->cctx,
1229                             (const uint8_t *)buff, dec_size,
1230                             zip->decrypted_buffer, &dsize);
1231                 }
1232                 bytes_avail = dec_size;
1233                 buff = (const char *)zip->decrypted_buffer;
1234         }
1235         *size = bytes_avail;
1236         zip->entry_bytes_remaining -= bytes_avail;
1237         zip->entry_uncompressed_bytes_read += bytes_avail;
1238         zip->entry_compressed_bytes_read += bytes_avail;
1239         zip->unconsumed += bytes_avail;
1240         *_buff = buff;
1241         return (ARCHIVE_OK);
1242 }
1243
1244 #ifdef HAVE_ZLIB_H
1245 static int
1246 zip_deflate_init(struct archive_read *a, struct zip *zip)
1247 {
1248         int r;
1249
1250         /* If we haven't yet read any data, initialize the decompressor. */
1251         if (!zip->decompress_init) {
1252                 if (zip->stream_valid)
1253                         r = inflateReset(&zip->stream);
1254                 else
1255                         r = inflateInit2(&zip->stream,
1256                             -15 /* Don't check for zlib header */);
1257                 if (r != Z_OK) {
1258                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1259                             "Can't initialize ZIP decompression.");
1260                         return (ARCHIVE_FATAL);
1261                 }
1262                 /* Stream structure has been set up. */
1263                 zip->stream_valid = 1;
1264                 /* We've initialized decompression for this stream. */
1265                 zip->decompress_init = 1;
1266         }
1267         return (ARCHIVE_OK);
1268 }
1269
1270 static int
1271 zip_read_data_deflate(struct archive_read *a, const void **buff,
1272     size_t *size, int64_t *offset)
1273 {
1274         struct zip *zip;
1275         ssize_t bytes_avail;
1276         const void *compressed_buff, *sp;
1277         int r;
1278
1279         (void)offset; /* UNUSED */
1280
1281         zip = (struct zip *)(a->format->data);
1282
1283         /* If the buffer hasn't been allocated, allocate it now. */
1284         if (zip->uncompressed_buffer == NULL) {
1285                 zip->uncompressed_buffer_size = 256 * 1024;
1286                 zip->uncompressed_buffer
1287                     = (unsigned char *)malloc(zip->uncompressed_buffer_size);
1288                 if (zip->uncompressed_buffer == NULL) {
1289                         archive_set_error(&a->archive, ENOMEM,
1290                             "No memory for ZIP decompression");
1291                         return (ARCHIVE_FATAL);
1292                 }
1293         }
1294
1295         r = zip_deflate_init(a, zip);
1296         if (r != ARCHIVE_OK)
1297                 return (r);
1298
1299         /*
1300          * Note: '1' here is a performance optimization.
1301          * Recall that the decompression layer returns a count of
1302          * available bytes; asking for more than that forces the
1303          * decompressor to combine reads by copying data.
1304          */
1305         compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail);
1306         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1307             && bytes_avail > zip->entry_bytes_remaining) {
1308                 bytes_avail = (ssize_t)zip->entry_bytes_remaining;
1309         }
1310         if (bytes_avail < 0) {
1311                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1312                     "Truncated ZIP file body");
1313                 return (ARCHIVE_FATAL);
1314         }
1315
1316         if (zip->tctx_valid || zip->cctx_valid) {
1317                 if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) {
1318                         size_t buff_remaining =
1319                             (zip->decrypted_buffer + zip->decrypted_buffer_size)
1320                             - (zip->decrypted_ptr + zip->decrypted_bytes_remaining);
1321
1322                         if (buff_remaining > (size_t)bytes_avail)
1323                                 buff_remaining = (size_t)bytes_avail;
1324
1325                         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) &&
1326                               zip->entry_bytes_remaining > 0) {
1327                                 if ((int64_t)(zip->decrypted_bytes_remaining
1328                                     + buff_remaining)
1329                                       > zip->entry_bytes_remaining) {
1330                                         if (zip->entry_bytes_remaining <
1331                                               (int64_t)zip->decrypted_bytes_remaining)
1332                                                 buff_remaining = 0;
1333                                         else
1334                                                 buff_remaining =
1335                                                     (size_t)zip->entry_bytes_remaining
1336                                                       - zip->decrypted_bytes_remaining;
1337                                 }
1338                         }
1339                         if (buff_remaining > 0) {
1340                                 if (zip->tctx_valid) {
1341                                         trad_enc_decrypt_update(&zip->tctx,
1342                                             compressed_buff, buff_remaining,
1343                                             zip->decrypted_ptr
1344                                               + zip->decrypted_bytes_remaining,
1345                                             buff_remaining);
1346                                 } else {
1347                                         size_t dsize = buff_remaining;
1348                                         archive_decrypto_aes_ctr_update(
1349                                             &zip->cctx,
1350                                             compressed_buff, buff_remaining,
1351                                             zip->decrypted_ptr
1352                                               + zip->decrypted_bytes_remaining,
1353                                             &dsize);
1354                                 }
1355                                 zip->decrypted_bytes_remaining += buff_remaining;
1356                         }
1357                 }
1358                 bytes_avail = zip->decrypted_bytes_remaining;
1359                 compressed_buff = (const char *)zip->decrypted_ptr;
1360         }
1361
1362         /*
1363          * A bug in zlib.h: stream.next_in should be marked 'const'
1364          * but isn't (the library never alters data through the
1365          * next_in pointer, only reads it).  The result: this ugly
1366          * cast to remove 'const'.
1367          */
1368         zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff;
1369         zip->stream.avail_in = (uInt)bytes_avail;
1370         zip->stream.total_in = 0;
1371         zip->stream.next_out = zip->uncompressed_buffer;
1372         zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size;
1373         zip->stream.total_out = 0;
1374
1375         r = inflate(&zip->stream, 0);
1376         switch (r) {
1377         case Z_OK:
1378                 break;
1379         case Z_STREAM_END:
1380                 zip->end_of_entry = 1;
1381                 break;
1382         case Z_MEM_ERROR:
1383                 archive_set_error(&a->archive, ENOMEM,
1384                     "Out of memory for ZIP decompression");
1385                 return (ARCHIVE_FATAL);
1386         default:
1387                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1388                     "ZIP decompression failed (%d)", r);
1389                 return (ARCHIVE_FATAL);
1390         }
1391
1392         /* Consume as much as the compressor actually used. */
1393         bytes_avail = zip->stream.total_in;
1394         if (zip->tctx_valid || zip->cctx_valid) {
1395                 zip->decrypted_bytes_remaining -= bytes_avail;
1396                 if (zip->decrypted_bytes_remaining == 0)
1397                         zip->decrypted_ptr = zip->decrypted_buffer;
1398                 else
1399                         zip->decrypted_ptr += bytes_avail;
1400         }
1401         /* Calculate compressed data as much as we used.*/
1402         if (zip->hctx_valid)
1403                 archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail);
1404         __archive_read_consume(a, bytes_avail);
1405         zip->entry_bytes_remaining -= bytes_avail;
1406         zip->entry_compressed_bytes_read += bytes_avail;
1407
1408         *size = zip->stream.total_out;
1409         zip->entry_uncompressed_bytes_read += zip->stream.total_out;
1410         *buff = zip->uncompressed_buffer;
1411
1412         if (zip->end_of_entry && zip->hctx_valid) {
1413                 r = check_authentication_code(a, NULL);
1414                 if (r != ARCHIVE_OK)
1415                         return (r);
1416         }
1417
1418         if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
1419                 const char *p;
1420
1421                 if (NULL == (p = __archive_read_ahead(a, 24, NULL))) {
1422                         archive_set_error(&a->archive,
1423                             ARCHIVE_ERRNO_FILE_FORMAT,
1424                             "Truncated ZIP end-of-file record");
1425                         return (ARCHIVE_FATAL);
1426                 }
1427                 /* Consume the optional PK\007\010 marker. */
1428                 if (p[0] == 'P' && p[1] == 'K' &&
1429                     p[2] == '\007' && p[3] == '\010') {
1430                         p += 4;
1431                         zip->unconsumed = 4;
1432                 }
1433                 if (zip->entry->flags & LA_USED_ZIP64) {
1434                         zip->entry->crc32 = archive_le32dec(p);
1435                         zip->entry->compressed_size = archive_le64dec(p + 4);
1436                         zip->entry->uncompressed_size = archive_le64dec(p + 12);
1437                         zip->unconsumed += 20;
1438                 } else {
1439                         zip->entry->crc32 = archive_le32dec(p);
1440                         zip->entry->compressed_size = archive_le32dec(p + 4);
1441                         zip->entry->uncompressed_size = archive_le32dec(p + 8);
1442                         zip->unconsumed += 12;
1443                 }
1444         }
1445
1446         return (ARCHIVE_OK);
1447 }
1448 #endif
1449
1450 static int
1451 read_decryption_header(struct archive_read *a)
1452 {
1453         struct zip *zip = (struct zip *)(a->format->data);
1454         const char *p;
1455         unsigned int remaining_size;
1456         unsigned int ts;
1457
1458         /*
1459          * Read an initialization vector data field.
1460          */
1461         p = __archive_read_ahead(a, 2, NULL);
1462         if (p == NULL)
1463                 goto truncated;
1464         ts = zip->iv_size;
1465         zip->iv_size = archive_le16dec(p);
1466         __archive_read_consume(a, 2);
1467         if (ts < zip->iv_size) {
1468                 free(zip->iv);
1469                 zip->iv = NULL;
1470         }
1471         p = __archive_read_ahead(a, zip->iv_size, NULL);
1472         if (p == NULL)
1473                 goto truncated;
1474         if (zip->iv == NULL) {
1475                 zip->iv = malloc(zip->iv_size);
1476                 if (zip->iv == NULL)
1477                         goto nomem;
1478         }
1479         memcpy(zip->iv, p, zip->iv_size);
1480         __archive_read_consume(a, zip->iv_size);
1481
1482         /*
1483          * Read a size of remaining decryption header field.
1484          */
1485         p = __archive_read_ahead(a, 14, NULL);
1486         if (p == NULL)
1487                 goto truncated;
1488         remaining_size = archive_le32dec(p);
1489         if (remaining_size < 16 || remaining_size > (1 << 18))
1490                 goto corrupted;
1491
1492         /* Check if format version is supported. */
1493         if (archive_le16dec(p+4) != 3) {
1494                 archive_set_error(&a->archive,
1495                     ARCHIVE_ERRNO_FILE_FORMAT,
1496                     "Unsupported encryption format version: %u",
1497                     archive_le16dec(p+4));
1498                 return (ARCHIVE_FAILED);
1499         }
1500
1501         /*
1502          * Read an encryption algorithm field.
1503          */
1504         zip->alg_id = archive_le16dec(p+6);
1505         switch (zip->alg_id) {
1506         case 0x6601:/* DES */
1507         case 0x6602:/* RC2 */
1508         case 0x6603:/* 3DES 168 */
1509         case 0x6609:/* 3DES 112 */
1510         case 0x660E:/* AES 128 */
1511         case 0x660F:/* AES 192 */
1512         case 0x6610:/* AES 256 */
1513         case 0x6702:/* RC2 (version >= 5.2) */
1514         case 0x6720:/* Blowfish */
1515         case 0x6721:/* Twofish */
1516         case 0x6801:/* RC4 */
1517                 /* Suuported encryption algorithm. */
1518                 break;
1519         default:
1520                 archive_set_error(&a->archive,
1521                     ARCHIVE_ERRNO_FILE_FORMAT,
1522                     "Unknown encryption algorithm: %u", zip->alg_id);
1523                 return (ARCHIVE_FAILED);
1524         }
1525
1526         /*
1527          * Read a bit length field.
1528          */
1529         zip->bit_len = archive_le16dec(p+8);
1530
1531         /*
1532          * Read a flags field.
1533          */
1534         zip->flags = archive_le16dec(p+10);
1535         switch (zip->flags & 0xf000) {
1536         case 0x0001: /* Password is required to decrypt. */
1537         case 0x0002: /* Certificates only. */
1538         case 0x0003: /* Password or certificate required to decrypt. */
1539                 break;
1540         default:
1541                 archive_set_error(&a->archive,
1542                     ARCHIVE_ERRNO_FILE_FORMAT,
1543                     "Unknown encryption flag: %u", zip->flags);
1544                 return (ARCHIVE_FAILED);
1545         }
1546         if ((zip->flags & 0xf000) == 0 ||
1547             (zip->flags & 0xf000) == 0x4000) {
1548                 archive_set_error(&a->archive,
1549                     ARCHIVE_ERRNO_FILE_FORMAT,
1550                     "Unknown encryption flag: %u", zip->flags);
1551                 return (ARCHIVE_FAILED);
1552         }
1553
1554         /*
1555          * Read an encrypted random data field.
1556          */
1557         ts = zip->erd_size;
1558         zip->erd_size = archive_le16dec(p+12);
1559         __archive_read_consume(a, 14);
1560         if ((zip->erd_size & 0xf) != 0 ||
1561             (zip->erd_size + 16) > remaining_size ||
1562             (zip->erd_size + 16) < zip->erd_size)
1563                 goto corrupted;
1564
1565         if (ts < zip->erd_size) {
1566                 free(zip->erd);
1567                 zip->erd = NULL;
1568         }
1569         p = __archive_read_ahead(a, zip->erd_size, NULL);
1570         if (p == NULL)
1571                 goto truncated;
1572         if (zip->erd == NULL) {
1573                 zip->erd = malloc(zip->erd_size);
1574                 if (zip->erd == NULL)
1575                         goto nomem;
1576         }
1577         memcpy(zip->erd, p, zip->erd_size);
1578         __archive_read_consume(a, zip->erd_size);
1579
1580         /*
1581          * Read a reserved data field.
1582          */
1583         p = __archive_read_ahead(a, 4, NULL);
1584         if (p == NULL)
1585                 goto truncated;
1586         /* Reserved data size should be zero. */
1587         if (archive_le32dec(p) != 0)
1588                 goto corrupted;
1589         __archive_read_consume(a, 4);
1590
1591         /*
1592          * Read a password validation data field.
1593          */
1594         p = __archive_read_ahead(a, 2, NULL);
1595         if (p == NULL)
1596                 goto truncated;
1597         ts = zip->v_size;
1598         zip->v_size = archive_le16dec(p);
1599         __archive_read_consume(a, 2);
1600         if ((zip->v_size & 0x0f) != 0 ||
1601             (zip->erd_size + zip->v_size + 16) > remaining_size ||
1602             (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size))
1603                 goto corrupted;
1604         if (ts < zip->v_size) {
1605                 free(zip->v_data);
1606                 zip->v_data = NULL;
1607         }
1608         p = __archive_read_ahead(a, zip->v_size, NULL);
1609         if (p == NULL)
1610                 goto truncated;
1611         if (zip->v_data == NULL) {
1612                 zip->v_data = malloc(zip->v_size);
1613                 if (zip->v_data == NULL)
1614                         goto nomem;
1615         }
1616         memcpy(zip->v_data, p, zip->v_size);
1617         __archive_read_consume(a, zip->v_size);
1618
1619         p = __archive_read_ahead(a, 4, NULL);
1620         if (p == NULL)
1621                 goto truncated;
1622         zip->v_crc32 = archive_le32dec(p);
1623         __archive_read_consume(a, 4);
1624
1625         /*return (ARCHIVE_OK);
1626          * This is not fully implemnted yet.*/
1627         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1628             "Encrypted file is unsupported");
1629         return (ARCHIVE_FAILED);
1630 truncated:
1631         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1632             "Truncated ZIP file data");
1633         return (ARCHIVE_FATAL);
1634 corrupted:
1635         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1636             "Corrupted ZIP file data");
1637         return (ARCHIVE_FATAL);
1638 nomem:
1639         archive_set_error(&a->archive, ENOMEM,
1640             "No memory for ZIP decryption");
1641         return (ARCHIVE_FATAL);
1642 }
1643
1644 static int
1645 zip_alloc_decryption_buffer(struct archive_read *a)
1646 {
1647         struct zip *zip = (struct zip *)(a->format->data);
1648         size_t bs = 256 * 1024;
1649
1650         if (zip->decrypted_buffer == NULL) {
1651                 zip->decrypted_buffer_size = bs;
1652                 zip->decrypted_buffer = malloc(bs);
1653                 if (zip->decrypted_buffer == NULL) {
1654                         archive_set_error(&a->archive, ENOMEM,
1655                             "No memory for ZIP decryption");
1656                         return (ARCHIVE_FATAL);
1657                 }
1658         }
1659         zip->decrypted_ptr = zip->decrypted_buffer;
1660         return (ARCHIVE_OK);
1661 }
1662
1663 static int
1664 init_traditional_PKWARE_decryption(struct archive_read *a)
1665 {
1666         struct zip *zip = (struct zip *)(a->format->data);
1667         const void *p;
1668         int retry;
1669         int r;
1670
1671         if (zip->tctx_valid)
1672                 return (ARCHIVE_OK);
1673
1674         /*
1675            Read the 12 bytes encryption header stored at
1676            the start of the data area.
1677          */
1678 #define ENC_HEADER_SIZE 12
1679         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1680             && zip->entry_bytes_remaining < ENC_HEADER_SIZE) {
1681                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1682                     "Truncated Zip encrypted body: only %jd bytes available",
1683                     (intmax_t)zip->entry_bytes_remaining);
1684                 return (ARCHIVE_FATAL);
1685         }
1686
1687         p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL);
1688         if (p == NULL) {
1689                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1690                     "Truncated ZIP file data");
1691                 return (ARCHIVE_FATAL);
1692         }
1693
1694         for (retry = 0;; retry++) {
1695                 const char *passphrase;
1696                 uint8_t crcchk;
1697
1698                 passphrase = __archive_read_next_passphrase(a);
1699                 if (passphrase == NULL) {
1700                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1701                             (retry > 0)?
1702                                 "Incorrect passphrase":
1703                                 "Passphrase required for this entry");
1704                         return (ARCHIVE_FAILED);
1705                 }
1706
1707                 /*
1708                  * Initialize ctx for Traditional PKWARE Decyption.
1709                  */
1710                 r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase),
1711                         p, ENC_HEADER_SIZE, &crcchk);
1712                 if (r == 0 && crcchk == zip->entry->decdat)
1713                         break;/* The passphrase is OK. */
1714                 if (retry > 10000) {
1715                         /* Avoid infinity loop. */
1716                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1717                             "Too many incorrect passphrases");
1718                         return (ARCHIVE_FAILED);
1719                 }
1720         }
1721
1722         __archive_read_consume(a, ENC_HEADER_SIZE);
1723         zip->tctx_valid = 1;
1724         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
1725             zip->entry_bytes_remaining -= ENC_HEADER_SIZE;
1726         }
1727         /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/
1728         zip->entry_compressed_bytes_read += ENC_HEADER_SIZE;
1729         zip->decrypted_bytes_remaining = 0;
1730
1731         return (zip_alloc_decryption_buffer(a));
1732 #undef ENC_HEADER_SIZE
1733 }
1734
1735 static int
1736 init_WinZip_AES_decryption(struct archive_read *a)
1737 {
1738         struct zip *zip = (struct zip *)(a->format->data);
1739         const void *p;
1740         const uint8_t *pv;
1741         size_t key_len, salt_len;
1742         uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE];
1743         int retry;
1744         int r;
1745
1746         if (zip->cctx_valid || zip->hctx_valid)
1747                 return (ARCHIVE_OK);
1748
1749         switch (zip->entry->aes_extra.strength) {
1750         case 1: salt_len = 8;  key_len = 16; break;
1751         case 2: salt_len = 12; key_len = 24; break;
1752         case 3: salt_len = 16; key_len = 32; break;
1753         default: goto corrupted;
1754         }
1755         p = __archive_read_ahead(a, salt_len + 2, NULL);
1756         if (p == NULL)
1757                 goto truncated;
1758
1759         for (retry = 0;; retry++) {
1760                 const char *passphrase;
1761
1762                 passphrase = __archive_read_next_passphrase(a);
1763                 if (passphrase == NULL) {
1764                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1765                             (retry > 0)?
1766                                 "Incorrect passphrase":
1767                                 "Passphrase required for this entry");
1768                         return (ARCHIVE_FAILED);
1769                 }
1770                 memset(derived_key, 0, sizeof(derived_key));
1771                 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase),
1772                     p, salt_len, 1000, derived_key, key_len * 2 + 2);
1773                 if (r != 0) {
1774                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1775                             "Decryption is unsupported due to lack of "
1776                             "crypto library");
1777                         return (ARCHIVE_FAILED);
1778                 }
1779
1780                 /* Check password verification value. */
1781                 pv = ((const uint8_t *)p) + salt_len;
1782                 if (derived_key[key_len * 2] == pv[0] &&
1783                     derived_key[key_len * 2 + 1] == pv[1])
1784                         break;/* The passphrase is OK. */
1785                 if (retry > 10000) {
1786                         /* Avoid infinity loop. */
1787                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1788                             "Too many incorrect passphrases");
1789                         return (ARCHIVE_FAILED);
1790                 }
1791         }
1792
1793         r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len);
1794         if (r != 0) {
1795                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1796                     "Decryption is unsupported due to lack of crypto library");
1797                 return (ARCHIVE_FAILED);
1798         }
1799         r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len);
1800         if (r != 0) {
1801                 archive_decrypto_aes_ctr_release(&zip->cctx);
1802                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1803                     "Failed to initialize HMAC-SHA1");
1804                 return (ARCHIVE_FAILED);
1805         }
1806         zip->cctx_valid = zip->hctx_valid = 1;
1807         __archive_read_consume(a, salt_len + 2);
1808         zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE;
1809         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1810             && zip->entry_bytes_remaining < 0)
1811                 goto corrupted;
1812         zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE;
1813         zip->decrypted_bytes_remaining = 0;
1814
1815         zip->entry->compression = zip->entry->aes_extra.compression;
1816         return (zip_alloc_decryption_buffer(a));
1817
1818 truncated:
1819         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1820             "Truncated ZIP file data");
1821         return (ARCHIVE_FATAL);
1822 corrupted:
1823         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1824             "Corrupted ZIP file data");
1825         return (ARCHIVE_FATAL);
1826 }
1827
1828 static int
1829 archive_read_format_zip_read_data(struct archive_read *a,
1830     const void **buff, size_t *size, int64_t *offset)
1831 {
1832         int r;
1833         struct zip *zip = (struct zip *)(a->format->data);
1834
1835         if (zip->has_encrypted_entries ==
1836                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
1837                 zip->has_encrypted_entries = 0;
1838         }
1839
1840         *offset = zip->entry_uncompressed_bytes_read;
1841         *size = 0;
1842         *buff = NULL;
1843
1844         /* If we hit end-of-entry last time, return ARCHIVE_EOF. */
1845         if (zip->end_of_entry)
1846                 return (ARCHIVE_EOF);
1847
1848         /* Return EOF immediately if this is a non-regular file. */
1849         if (AE_IFREG != (zip->entry->mode & AE_IFMT))
1850                 return (ARCHIVE_EOF);
1851
1852         __archive_read_consume(a, zip->unconsumed);
1853         zip->unconsumed = 0;
1854
1855         if (zip->init_decryption) {
1856                 zip->has_encrypted_entries = 1;
1857                 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
1858                         r = read_decryption_header(a);
1859                 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
1860                         r = init_WinZip_AES_decryption(a);
1861                 else
1862                         r = init_traditional_PKWARE_decryption(a);
1863                 if (r != ARCHIVE_OK)
1864                         return (r);
1865                 zip->init_decryption = 0;
1866         }
1867
1868         switch(zip->entry->compression) {
1869         case 0:  /* No compression. */
1870                 r =  zip_read_data_none(a, buff, size, offset);
1871                 break;
1872 #ifdef HAVE_ZLIB_H
1873         case 8: /* Deflate compression. */
1874                 r =  zip_read_data_deflate(a, buff, size, offset);
1875                 break;
1876 #endif
1877         default: /* Unsupported compression. */
1878                 /* Return a warning. */
1879                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1880                     "Unsupported ZIP compression method (%s)",
1881                     compression_name(zip->entry->compression));
1882                 /* We can't decompress this entry, but we will
1883                  * be able to skip() it and try the next entry. */
1884                 return (ARCHIVE_FAILED);
1885                 break;
1886         }
1887         if (r != ARCHIVE_OK)
1888                 return (r);
1889         /* Update checksum */
1890         if (*size)
1891                 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff,
1892                     (unsigned)*size);
1893         /* If we hit the end, swallow any end-of-data marker. */
1894         if (zip->end_of_entry) {
1895                 /* Check file size, CRC against these values. */
1896                 if (zip->entry->compressed_size !=
1897                     zip->entry_compressed_bytes_read) {
1898                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1899                             "ZIP compressed data is wrong size "
1900                             "(read %jd, expected %jd)",
1901                             (intmax_t)zip->entry_compressed_bytes_read,
1902                             (intmax_t)zip->entry->compressed_size);
1903                         return (ARCHIVE_WARN);
1904                 }
1905                 /* Size field only stores the lower 32 bits of the actual
1906                  * size. */
1907                 if ((zip->entry->uncompressed_size & UINT32_MAX)
1908                     != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) {
1909                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1910                             "ZIP uncompressed data is wrong size "
1911                             "(read %jd, expected %jd)\n",
1912                             (intmax_t)zip->entry_uncompressed_bytes_read,
1913                             (intmax_t)zip->entry->uncompressed_size);
1914                         return (ARCHIVE_WARN);
1915                 }
1916                 /* Check computed CRC against header */
1917                 if ((!zip->hctx_valid ||
1918                       zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) &&
1919                    zip->entry->crc32 != zip->entry_crc32
1920                     && !zip->ignore_crc32) {
1921                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1922                             "ZIP bad CRC: 0x%lx should be 0x%lx",
1923                             (unsigned long)zip->entry_crc32,
1924                             (unsigned long)zip->entry->crc32);
1925                         return (ARCHIVE_WARN);
1926                 }
1927         }
1928
1929         return (ARCHIVE_OK);
1930 }
1931
1932 static int
1933 archive_read_format_zip_cleanup(struct archive_read *a)
1934 {
1935         struct zip *zip;
1936         struct zip_entry *zip_entry, *next_zip_entry;
1937
1938         zip = (struct zip *)(a->format->data);
1939 #ifdef HAVE_ZLIB_H
1940         if (zip->stream_valid)
1941                 inflateEnd(&zip->stream);
1942         free(zip->uncompressed_buffer);
1943 #endif
1944         if (zip->zip_entries) {
1945                 zip_entry = zip->zip_entries;
1946                 while (zip_entry != NULL) {
1947                         next_zip_entry = zip_entry->next;
1948                         archive_string_free(&zip_entry->rsrcname);
1949                         free(zip_entry);
1950                         zip_entry = next_zip_entry;
1951                 }
1952         }
1953         free(zip->decrypted_buffer);
1954         if (zip->cctx_valid)
1955                 archive_decrypto_aes_ctr_release(&zip->cctx);
1956         if (zip->hctx_valid)
1957                 archive_hmac_sha1_cleanup(&zip->hctx);
1958         free(zip->iv);
1959         free(zip->erd);
1960         free(zip->v_data);
1961         archive_string_free(&zip->format_name);
1962         free(zip);
1963         (a->format->data) = NULL;
1964         return (ARCHIVE_OK);
1965 }
1966
1967 static int
1968 archive_read_format_zip_has_encrypted_entries(struct archive_read *_a)
1969 {
1970         if (_a && _a->format) {
1971                 struct zip * zip = (struct zip *)_a->format->data;
1972                 if (zip) {
1973                         return zip->has_encrypted_entries;
1974                 }
1975         }
1976         return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
1977 }
1978
1979 static int
1980 archive_read_format_zip_options(struct archive_read *a,
1981     const char *key, const char *val)
1982 {
1983         struct zip *zip;
1984         int ret = ARCHIVE_FAILED;
1985
1986         zip = (struct zip *)(a->format->data);
1987         if (strcmp(key, "compat-2x")  == 0) {
1988                 /* Handle filenames as libarchive 2.x */
1989                 zip->init_default_conversion = (val != NULL) ? 1 : 0;
1990                 return (ARCHIVE_OK);
1991         } else if (strcmp(key, "hdrcharset")  == 0) {
1992                 if (val == NULL || val[0] == 0)
1993                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1994                             "zip: hdrcharset option needs a character-set name"
1995                         );
1996                 else {
1997                         zip->sconv = archive_string_conversion_from_charset(
1998                             &a->archive, val, 0);
1999                         if (zip->sconv != NULL) {
2000                                 if (strcmp(val, "UTF-8") == 0)
2001                                         zip->sconv_utf8 = zip->sconv;
2002                                 ret = ARCHIVE_OK;
2003                         } else
2004                                 ret = ARCHIVE_FATAL;
2005                 }
2006                 return (ret);
2007         } else if (strcmp(key, "ignorecrc32") == 0) {
2008                 /* Mostly useful for testing. */
2009                 if (val == NULL || val[0] == 0) {
2010                         zip->crc32func = real_crc32;
2011                         zip->ignore_crc32 = 0;
2012                 } else {
2013                         zip->crc32func = fake_crc32;
2014                         zip->ignore_crc32 = 1;
2015                 }
2016                 return (ARCHIVE_OK);
2017         } else if (strcmp(key, "mac-ext") == 0) {
2018                 zip->process_mac_extensions = (val != NULL && val[0] != 0);
2019                 return (ARCHIVE_OK);
2020         }
2021
2022         /* Note: The "warn" return is just to inform the options
2023          * supervisor that we didn't handle it.  It will generate
2024          * a suitable error if no one used this option. */
2025         return (ARCHIVE_WARN);
2026 }
2027
2028 int
2029 archive_read_support_format_zip(struct archive *a)
2030 {
2031         int r;
2032         r = archive_read_support_format_zip_streamable(a);
2033         if (r != ARCHIVE_OK)
2034                 return r;
2035         return (archive_read_support_format_zip_seekable(a));
2036 }
2037
2038 /* ------------------------------------------------------------------------ */
2039
2040 /*
2041  * Streaming-mode support
2042  */
2043
2044
2045 static int
2046 archive_read_support_format_zip_capabilities_streamable(struct archive_read * a)
2047 {
2048         (void)a; /* UNUSED */
2049         return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
2050                 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
2051 }
2052
2053 static int
2054 archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid)
2055 {
2056         const char *p;
2057
2058         (void)best_bid; /* UNUSED */
2059
2060         if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
2061                 return (-1);
2062
2063         /*
2064          * Bid of 29 here comes from:
2065          *  + 16 bits for "PK",
2066          *  + next 16-bit field has 6 options so contributes
2067          *    about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits
2068          *
2069          * So we've effectively verified ~29 total bits of check data.
2070          */
2071         if (p[0] == 'P' && p[1] == 'K') {
2072                 if ((p[2] == '\001' && p[3] == '\002')
2073                     || (p[2] == '\003' && p[3] == '\004')
2074                     || (p[2] == '\005' && p[3] == '\006')
2075                     || (p[2] == '\006' && p[3] == '\006')
2076                     || (p[2] == '\007' && p[3] == '\010')
2077                     || (p[2] == '0' && p[3] == '0'))
2078                         return (29);
2079         }
2080
2081         /* TODO: It's worth looking ahead a little bit for a valid
2082          * PK signature.  In particular, that would make it possible
2083          * to read some UUEncoded SFX files or SFX files coming from
2084          * a network socket. */
2085
2086         return (0);
2087 }
2088
2089 static int
2090 archive_read_format_zip_streamable_read_header(struct archive_read *a,
2091     struct archive_entry *entry)
2092 {
2093         struct zip *zip;
2094
2095         a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
2096         if (a->archive.archive_format_name == NULL)
2097                 a->archive.archive_format_name = "ZIP";
2098
2099         zip = (struct zip *)(a->format->data);
2100
2101         /*
2102          * It should be sufficient to call archive_read_next_header() for
2103          * a reader to determine if an entry is encrypted or not. If the
2104          * encryption of an entry is only detectable when calling
2105          * archive_read_data(), so be it. We'll do the same check there
2106          * as well.
2107          */
2108         if (zip->has_encrypted_entries ==
2109                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
2110                 zip->has_encrypted_entries = 0;
2111
2112         /* Make sure we have a zip_entry structure to use. */
2113         if (zip->zip_entries == NULL) {
2114                 zip->zip_entries = malloc(sizeof(struct zip_entry));
2115                 if (zip->zip_entries == NULL) {
2116                         archive_set_error(&a->archive, ENOMEM,
2117                             "Out  of memory");
2118                         return ARCHIVE_FATAL;
2119                 }
2120         }
2121         zip->entry = zip->zip_entries;
2122         memset(zip->entry, 0, sizeof(struct zip_entry));
2123
2124         if (zip->cctx_valid)
2125                 archive_decrypto_aes_ctr_release(&zip->cctx);
2126         if (zip->hctx_valid)
2127                 archive_hmac_sha1_cleanup(&zip->hctx);
2128         zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
2129         __archive_read_reset_passphrase(a);
2130
2131         /* Search ahead for the next local file header. */
2132         __archive_read_consume(a, zip->unconsumed);
2133         zip->unconsumed = 0;
2134         for (;;) {
2135                 int64_t skipped = 0;
2136                 const char *p, *end;
2137                 ssize_t bytes;
2138
2139                 p = __archive_read_ahead(a, 4, &bytes);
2140                 if (p == NULL)
2141                         return (ARCHIVE_FATAL);
2142                 end = p + bytes;
2143
2144                 while (p + 4 <= end) {
2145                         if (p[0] == 'P' && p[1] == 'K') {
2146                                 if (p[2] == '\003' && p[3] == '\004') {
2147                                         /* Regular file entry. */
2148                                         __archive_read_consume(a, skipped);
2149                                         return zip_read_local_file_header(a,
2150                                             entry, zip);
2151                                 }
2152
2153                               /*
2154                                * TODO: We cannot restore permissions
2155                                * based only on the local file headers.
2156                                * Consider scanning the central
2157                                * directory and returning additional
2158                                * entries for at least directories.
2159                                * This would allow us to properly set
2160                                * directory permissions.
2161                                *
2162                                * This won't help us fix symlinks
2163                                * and may not help with regular file
2164                                * permissions, either.  <sigh>
2165                                */
2166                               if (p[2] == '\001' && p[3] == '\002') {
2167                                       return (ARCHIVE_EOF);
2168                               }
2169
2170                               /* End of central directory?  Must be an
2171                                * empty archive. */
2172                               if ((p[2] == '\005' && p[3] == '\006')
2173                                   || (p[2] == '\006' && p[3] == '\006'))
2174                                       return (ARCHIVE_EOF);
2175                         }
2176                         ++p;
2177                         ++skipped;
2178                 }
2179                 __archive_read_consume(a, skipped);
2180         }
2181 }
2182
2183 static int
2184 archive_read_format_zip_read_data_skip_streamable(struct archive_read *a)
2185 {
2186         struct zip *zip;
2187         int64_t bytes_skipped;
2188
2189         zip = (struct zip *)(a->format->data);
2190         bytes_skipped = __archive_read_consume(a, zip->unconsumed);
2191         zip->unconsumed = 0;
2192         if (bytes_skipped < 0)
2193                 return (ARCHIVE_FATAL);
2194
2195         /* If we've already read to end of data, we're done. */
2196         if (zip->end_of_entry)
2197                 return (ARCHIVE_OK);
2198
2199         /* So we know we're streaming... */
2200         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2201             || zip->entry->compressed_size > 0) {
2202                 /* We know the compressed length, so we can just skip. */
2203                 bytes_skipped = __archive_read_consume(a,
2204                                         zip->entry_bytes_remaining);
2205                 if (bytes_skipped < 0)
2206                         return (ARCHIVE_FATAL);
2207                 return (ARCHIVE_OK);
2208         }
2209
2210         if (zip->init_decryption) {
2211                 int r;
2212
2213                 zip->has_encrypted_entries = 1;
2214                 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
2215                         r = read_decryption_header(a);
2216                 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
2217                         r = init_WinZip_AES_decryption(a);
2218                 else
2219                         r = init_traditional_PKWARE_decryption(a);
2220                 if (r != ARCHIVE_OK)
2221                         return (r);
2222                 zip->init_decryption = 0;
2223         }
2224
2225         /* We're streaming and we don't know the length. */
2226         /* If the body is compressed and we know the format, we can
2227          * find an exact end-of-entry by decompressing it. */
2228         switch (zip->entry->compression) {
2229 #ifdef HAVE_ZLIB_H
2230         case 8: /* Deflate compression. */
2231                 while (!zip->end_of_entry) {
2232                         int64_t offset = 0;
2233                         const void *buff = NULL;
2234                         size_t size = 0;
2235                         int r;
2236                         r =  zip_read_data_deflate(a, &buff, &size, &offset);
2237                         if (r != ARCHIVE_OK)
2238                                 return (r);
2239                 }
2240                 return ARCHIVE_OK;
2241 #endif
2242         default: /* Uncompressed or unknown. */
2243                 /* Scan for a PK\007\010 signature. */
2244                 for (;;) {
2245                         const char *p, *buff;
2246                         ssize_t bytes_avail;
2247                         buff = __archive_read_ahead(a, 16, &bytes_avail);
2248                         if (bytes_avail < 16) {
2249                                 archive_set_error(&a->archive,
2250                                     ARCHIVE_ERRNO_FILE_FORMAT,
2251                                     "Truncated ZIP file data");
2252                                 return (ARCHIVE_FATAL);
2253                         }
2254                         p = buff;
2255                         while (p <= buff + bytes_avail - 16) {
2256                                 if (p[3] == 'P') { p += 3; }
2257                                 else if (p[3] == 'K') { p += 2; }
2258                                 else if (p[3] == '\007') { p += 1; }
2259                                 else if (p[3] == '\010' && p[2] == '\007'
2260                                     && p[1] == 'K' && p[0] == 'P') {
2261                                         if (zip->entry->flags & LA_USED_ZIP64)
2262                                                 __archive_read_consume(a,
2263                                                     p - buff + 24);
2264                                         else
2265                                                 __archive_read_consume(a,
2266                                                     p - buff + 16);
2267                                         return ARCHIVE_OK;
2268                                 } else { p += 4; }
2269                         }
2270                         __archive_read_consume(a, p - buff);
2271                 }
2272         }
2273 }
2274
2275 int
2276 archive_read_support_format_zip_streamable(struct archive *_a)
2277 {
2278         struct archive_read *a = (struct archive_read *)_a;
2279         struct zip *zip;
2280         int r;
2281
2282         archive_check_magic(_a, ARCHIVE_READ_MAGIC,
2283             ARCHIVE_STATE_NEW, "archive_read_support_format_zip");
2284
2285         zip = (struct zip *)calloc(1, sizeof(*zip));
2286         if (zip == NULL) {
2287                 archive_set_error(&a->archive, ENOMEM,
2288                     "Can't allocate zip data");
2289                 return (ARCHIVE_FATAL);
2290         }
2291
2292         /* Streamable reader doesn't support mac extensions. */
2293         zip->process_mac_extensions = 0;
2294
2295         /*
2296          * Until enough data has been read, we cannot tell about
2297          * any encrypted entries yet.
2298          */
2299         zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
2300         zip->crc32func = real_crc32;
2301
2302         r = __archive_read_register_format(a,
2303             zip,
2304             "zip",
2305             archive_read_format_zip_streamable_bid,
2306             archive_read_format_zip_options,
2307             archive_read_format_zip_streamable_read_header,
2308             archive_read_format_zip_read_data,
2309             archive_read_format_zip_read_data_skip_streamable,
2310             NULL,
2311             archive_read_format_zip_cleanup,
2312             archive_read_support_format_zip_capabilities_streamable,
2313             archive_read_format_zip_has_encrypted_entries);
2314
2315         if (r != ARCHIVE_OK)
2316                 free(zip);
2317         return (ARCHIVE_OK);
2318 }
2319
2320 /* ------------------------------------------------------------------------ */
2321
2322 /*
2323  * Seeking-mode support
2324  */
2325
2326 static int
2327 archive_read_support_format_zip_capabilities_seekable(struct archive_read * a)
2328 {
2329         (void)a; /* UNUSED */
2330         return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
2331                 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
2332 }
2333
2334 /*
2335  * TODO: This is a performance sink because it forces the read core to
2336  * drop buffered data from the start of file, which will then have to
2337  * be re-read again if this bidder loses.
2338  *
2339  * We workaround this a little by passing in the best bid so far so
2340  * that later bidders can do nothing if they know they'll never
2341  * outbid.  But we can certainly do better...
2342  */
2343 static int
2344 read_eocd(struct zip *zip, const char *p, int64_t current_offset)
2345 {
2346         /* Sanity-check the EOCD we've found. */
2347
2348         /* This must be the first volume. */
2349         if (archive_le16dec(p + 4) != 0)
2350                 return 0;
2351         /* Central directory must be on this volume. */
2352         if (archive_le16dec(p + 4) != archive_le16dec(p + 6))
2353                 return 0;
2354         /* All central directory entries must be on this volume. */
2355         if (archive_le16dec(p + 10) != archive_le16dec(p + 8))
2356                 return 0;
2357         /* Central directory can't extend beyond start of EOCD record. */
2358         if (archive_le32dec(p + 16) + archive_le32dec(p + 12)
2359             > current_offset)
2360                 return 0;
2361
2362         /* Save the central directory location for later use. */
2363         zip->central_directory_offset = archive_le32dec(p + 16);
2364
2365         /* This is just a tiny bit higher than the maximum
2366            returned by the streaming Zip bidder.  This ensures
2367            that the more accurate seeking Zip parser wins
2368            whenever seek is available. */
2369         return 32;
2370 }
2371
2372 /*
2373  * Examine Zip64 EOCD locator:  If it's valid, store the information
2374  * from it.
2375  */
2376 static void
2377 read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p)
2378 {
2379         int64_t eocd64_offset;
2380         int64_t eocd64_size;
2381
2382         /* Sanity-check the locator record. */
2383
2384         /* Central dir must be on first volume. */
2385         if (archive_le32dec(p + 4) != 0)
2386                 return;
2387         /* Must be only a single volume. */
2388         if (archive_le32dec(p + 16) != 1)
2389                 return;
2390
2391         /* Find the Zip64 EOCD record. */
2392         eocd64_offset = archive_le64dec(p + 8);
2393         if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0)
2394                 return;
2395         if ((p = __archive_read_ahead(a, 56, NULL)) == NULL)
2396                 return;
2397         /* Make sure we can read all of it. */
2398         eocd64_size = archive_le64dec(p + 4) + 12;
2399         if (eocd64_size < 56 || eocd64_size > 16384)
2400                 return;
2401         if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL)
2402                 return;
2403
2404         /* Sanity-check the EOCD64 */
2405         if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */
2406                 return;
2407         if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */
2408                 return;
2409         /* CD can't be split. */
2410         if (archive_le64dec(p + 24) != archive_le64dec(p + 32))
2411                 return;
2412
2413         /* Save the central directory offset for later use. */
2414         zip->central_directory_offset = archive_le64dec(p + 48);
2415 }
2416
2417 static int
2418 archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid)
2419 {
2420         struct zip *zip = (struct zip *)a->format->data;
2421         int64_t file_size, current_offset;
2422         const char *p;
2423         int i, tail;
2424
2425         /* If someone has already bid more than 32, then avoid
2426            trashing the look-ahead buffers with a seek. */
2427         if (best_bid > 32)
2428                 return (-1);
2429
2430         file_size = __archive_read_seek(a, 0, SEEK_END);
2431         if (file_size <= 0)
2432                 return 0;
2433
2434         /* Search last 16k of file for end-of-central-directory
2435          * record (which starts with PK\005\006) */
2436         tail = (int)zipmin(1024 * 16, file_size);
2437         current_offset = __archive_read_seek(a, -tail, SEEK_END);
2438         if (current_offset < 0)
2439                 return 0;
2440         if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL)
2441                 return 0;
2442         /* Boyer-Moore search backwards from the end, since we want
2443          * to match the last EOCD in the file (there can be more than
2444          * one if there is an uncompressed Zip archive as a member
2445          * within this Zip archive). */
2446         for (i = tail - 22; i > 0;) {
2447                 switch (p[i]) {
2448                 case 'P':
2449                         if (memcmp(p + i, "PK\005\006", 4) == 0) {
2450                                 int ret = read_eocd(zip, p + i,
2451                                     current_offset + i);
2452                                 if (ret > 0) {
2453                                         /* Zip64 EOCD locator precedes
2454                                          * regular EOCD if present. */
2455                                         if (i >= 20
2456                                             && memcmp(p + i - 20, "PK\006\007", 4) == 0) {
2457                                                 read_zip64_eocd(a, zip, p + i - 20);
2458                                         }
2459                                         return (ret);
2460                                 }
2461                         }
2462                         i -= 4;
2463                         break;
2464                 case 'K': i -= 1; break;
2465                 case 005: i -= 2; break;
2466                 case 006: i -= 3; break;
2467                 default: i -= 4; break;
2468                 }
2469         }
2470         return 0;
2471 }
2472
2473 /* The red-black trees are only used in seeking mode to manage
2474  * the in-memory copy of the central directory. */
2475
2476 static int
2477 cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2)
2478 {
2479         const struct zip_entry *e1 = (const struct zip_entry *)n1;
2480         const struct zip_entry *e2 = (const struct zip_entry *)n2;
2481
2482         if (e1->local_header_offset > e2->local_header_offset)
2483                 return -1;
2484         if (e1->local_header_offset < e2->local_header_offset)
2485                 return 1;
2486         return 0;
2487 }
2488
2489 static int
2490 cmp_key(const struct archive_rb_node *n, const void *key)
2491 {
2492         /* This function won't be called */
2493         (void)n; /* UNUSED */
2494         (void)key; /* UNUSED */
2495         return 1;
2496 }
2497
2498 static const struct archive_rb_tree_ops rb_ops = {
2499         &cmp_node, &cmp_key
2500 };
2501
2502 static int
2503 rsrc_cmp_node(const struct archive_rb_node *n1,
2504     const struct archive_rb_node *n2)
2505 {
2506         const struct zip_entry *e1 = (const struct zip_entry *)n1;
2507         const struct zip_entry *e2 = (const struct zip_entry *)n2;
2508
2509         return (strcmp(e2->rsrcname.s, e1->rsrcname.s));
2510 }
2511
2512 static int
2513 rsrc_cmp_key(const struct archive_rb_node *n, const void *key)
2514 {
2515         const struct zip_entry *e = (const struct zip_entry *)n;
2516         return (strcmp((const char *)key, e->rsrcname.s));
2517 }
2518
2519 static const struct archive_rb_tree_ops rb_rsrc_ops = {
2520         &rsrc_cmp_node, &rsrc_cmp_key
2521 };
2522
2523 static const char *
2524 rsrc_basename(const char *name, size_t name_length)
2525 {
2526         const char *s, *r;
2527
2528         r = s = name;
2529         for (;;) {
2530                 s = memchr(s, '/', name_length - (s - name));
2531                 if (s == NULL)
2532                         break;
2533                 r = ++s;
2534         }
2535         return (r);
2536 }
2537
2538 static void
2539 expose_parent_dirs(struct zip *zip, const char *name, size_t name_length)
2540 {
2541         struct archive_string str;
2542         struct zip_entry *dir;
2543         char *s;
2544
2545         archive_string_init(&str);
2546         archive_strncpy(&str, name, name_length);
2547         for (;;) {
2548                 s = strrchr(str.s, '/');
2549                 if (s == NULL)
2550                         break;
2551                 *s = '\0';
2552                 /* Transfer the parent directory from zip->tree_rsrc RB
2553                  * tree to zip->tree RB tree to expose. */
2554                 dir = (struct zip_entry *)
2555                     __archive_rb_tree_find_node(&zip->tree_rsrc, str.s);
2556                 if (dir == NULL)
2557                         break;
2558                 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node);
2559                 archive_string_free(&dir->rsrcname);
2560                 __archive_rb_tree_insert_node(&zip->tree, &dir->node);
2561         }
2562         archive_string_free(&str);
2563 }
2564
2565 static int
2566 slurp_central_directory(struct archive_read *a, struct zip *zip)
2567 {
2568         ssize_t i;
2569         unsigned found;
2570         int64_t correction;
2571         ssize_t bytes_avail;
2572         const char *p;
2573
2574         /*
2575          * Find the start of the central directory.  The end-of-CD
2576          * record has our starting point, but there are lots of
2577          * Zip archives which have had other data prepended to the
2578          * file, which makes the recorded offsets all too small.
2579          * So we search forward from the specified offset until we
2580          * find the real start of the central directory.  Then we
2581          * know the correction we need to apply to account for leading
2582          * padding.
2583          */
2584         if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0)
2585                 return ARCHIVE_FATAL;
2586
2587         found = 0;
2588         while (!found) {
2589                 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL)
2590                         return ARCHIVE_FATAL;
2591                 for (found = 0, i = 0; !found && i < bytes_avail - 4;) {
2592                         switch (p[i + 3]) {
2593                         case 'P': i += 3; break;
2594                         case 'K': i += 2; break;
2595                         case 001: i += 1; break;
2596                         case 002:
2597                                 if (memcmp(p + i, "PK\001\002", 4) == 0) {
2598                                         p += i;
2599                                         found = 1;
2600                                 } else
2601                                         i += 4;
2602                                 break;
2603                         case 005: i += 1; break;
2604                         case 006:
2605                                 if (memcmp(p + i, "PK\005\006", 4) == 0) {
2606                                         p += i;
2607                                         found = 1;
2608                                 } else if (memcmp(p + i, "PK\006\006", 4) == 0) {
2609                                         p += i;
2610                                         found = 1;
2611                                 } else
2612                                         i += 1;
2613                                 break;
2614                         default: i += 4; break;
2615                         }
2616                 }
2617                 __archive_read_consume(a, i);
2618         }
2619         correction = archive_filter_bytes(&a->archive, 0)
2620                         - zip->central_directory_offset;
2621
2622         __archive_rb_tree_init(&zip->tree, &rb_ops);
2623         __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops);
2624
2625         zip->central_directory_entries_total = 0;
2626         while (1) {
2627                 struct zip_entry *zip_entry;
2628                 size_t filename_length, extra_length, comment_length;
2629                 uint32_t external_attributes;
2630                 const char *name, *r;
2631
2632                 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
2633                         return ARCHIVE_FATAL;
2634                 if (memcmp(p, "PK\006\006", 4) == 0
2635                     || memcmp(p, "PK\005\006", 4) == 0) {
2636                         break;
2637                 } else if (memcmp(p, "PK\001\002", 4) != 0) {
2638                         archive_set_error(&a->archive,
2639                             -1, "Invalid central directory signature");
2640                         return ARCHIVE_FATAL;
2641                 }
2642                 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL)
2643                         return ARCHIVE_FATAL;
2644
2645                 zip_entry = calloc(1, sizeof(struct zip_entry));
2646                 zip_entry->next = zip->zip_entries;
2647                 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY;
2648                 zip->zip_entries = zip_entry;
2649                 zip->central_directory_entries_total++;
2650
2651                 /* version = p[4]; */
2652                 zip_entry->system = p[5];
2653                 /* version_required = archive_le16dec(p + 6); */
2654                 zip_entry->zip_flags = archive_le16dec(p + 8);
2655                 if (zip_entry->zip_flags
2656                       & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){
2657                         zip->has_encrypted_entries = 1;
2658                 }
2659                 zip_entry->compression = (char)archive_le16dec(p + 10);
2660                 zip_entry->mtime = zip_time(p + 12);
2661                 zip_entry->crc32 = archive_le32dec(p + 16);
2662                 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
2663                         zip_entry->decdat = p[13];
2664                 else
2665                         zip_entry->decdat = p[19];
2666                 zip_entry->compressed_size = archive_le32dec(p + 20);
2667                 zip_entry->uncompressed_size = archive_le32dec(p + 24);
2668                 filename_length = archive_le16dec(p + 28);
2669                 extra_length = archive_le16dec(p + 30);
2670                 comment_length = archive_le16dec(p + 32);
2671                 /* disk_start = archive_le16dec(p + 34); */ /* Better be zero. */
2672                 /* internal_attributes = archive_le16dec(p + 36); */ /* text bit */
2673                 external_attributes = archive_le32dec(p + 38);
2674                 zip_entry->local_header_offset =
2675                     archive_le32dec(p + 42) + correction;
2676
2677                 /* If we can't guess the mode, leave it zero here;
2678                    when we read the local file header we might get
2679                    more information. */
2680                 if (zip_entry->system == 3) {
2681                         zip_entry->mode = external_attributes >> 16;
2682                 } else if (zip_entry->system == 0) {
2683                         // Interpret MSDOS directory bit
2684                         if (0x10 == (external_attributes & 0x10)) {
2685                                 zip_entry->mode = AE_IFDIR | 0775;
2686                         } else {
2687                                 zip_entry->mode = AE_IFREG | 0664;
2688                         }
2689                         if (0x01 == (external_attributes & 0x01)) {
2690                                 // Read-only bit; strip write permissions
2691                                 zip_entry->mode &= 0555;
2692                         }
2693                 } else {
2694                         zip_entry->mode = 0;
2695                 }
2696
2697                 /* We're done with the regular data; get the filename and
2698                  * extra data. */
2699                 __archive_read_consume(a, 46);
2700                 p = __archive_read_ahead(a, filename_length + extra_length,
2701                         NULL);
2702                 if (p == NULL) {
2703                         archive_set_error(&a->archive,
2704                             ARCHIVE_ERRNO_FILE_FORMAT,
2705                             "Truncated ZIP file header");
2706                         return ARCHIVE_FATAL;
2707                 }
2708                 if (ARCHIVE_OK != process_extra(a, p + filename_length, extra_length, zip_entry)) {
2709                         return ARCHIVE_FATAL;
2710                 }
2711
2712                 /*
2713                  * Mac resource fork files are stored under the
2714                  * "__MACOSX/" directory, so we should check if
2715                  * it is.
2716                  */
2717                 if (!zip->process_mac_extensions) {
2718                         /* Treat every entry as a regular entry. */
2719                         __archive_rb_tree_insert_node(&zip->tree,
2720                             &zip_entry->node);
2721                 } else {
2722                         name = p;
2723                         r = rsrc_basename(name, filename_length);
2724                         if (filename_length >= 9 &&
2725                             strncmp("__MACOSX/", name, 9) == 0) {
2726                                 /* If this file is not a resource fork nor
2727                                  * a directory. We should treat it as a non
2728                                  * resource fork file to expose it. */
2729                                 if (name[filename_length-1] != '/' &&
2730                                     (r - name < 3 || r[0] != '.' || r[1] != '_')) {
2731                                         __archive_rb_tree_insert_node(
2732                                             &zip->tree, &zip_entry->node);
2733                                         /* Expose its parent directories. */
2734                                         expose_parent_dirs(zip, name,
2735                                             filename_length);
2736                                 } else {
2737                                         /* This file is a resource fork file or
2738                                          * a directory. */
2739                                         archive_strncpy(&(zip_entry->rsrcname),
2740                                              name, filename_length);
2741                                         __archive_rb_tree_insert_node(
2742                                             &zip->tree_rsrc, &zip_entry->node);
2743                                 }
2744                         } else {
2745                                 /* Generate resource fork name to find its
2746                                  * resource file at zip->tree_rsrc. */
2747                                 archive_strcpy(&(zip_entry->rsrcname),
2748                                     "__MACOSX/");
2749                                 archive_strncat(&(zip_entry->rsrcname),
2750                                     name, r - name);
2751                                 archive_strcat(&(zip_entry->rsrcname), "._");
2752                                 archive_strncat(&(zip_entry->rsrcname),
2753                                     name + (r - name),
2754                                     filename_length - (r - name));
2755                                 /* Register an entry to RB tree to sort it by
2756                                  * file offset. */
2757                                 __archive_rb_tree_insert_node(&zip->tree,
2758                                     &zip_entry->node);
2759                         }
2760                 }
2761
2762                 /* Skip the comment too ... */
2763                 __archive_read_consume(a,
2764                     filename_length + extra_length + comment_length);
2765         }
2766
2767         return ARCHIVE_OK;
2768 }
2769
2770 static ssize_t
2771 zip_get_local_file_header_size(struct archive_read *a, size_t extra)
2772 {
2773         const char *p;
2774         ssize_t filename_length, extra_length;
2775
2776         if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) {
2777                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2778                     "Truncated ZIP file header");
2779                 return (ARCHIVE_WARN);
2780         }
2781         p += extra;
2782
2783         if (memcmp(p, "PK\003\004", 4) != 0) {
2784                 archive_set_error(&a->archive, -1, "Damaged Zip archive");
2785                 return ARCHIVE_WARN;
2786         }
2787         filename_length = archive_le16dec(p + 26);
2788         extra_length = archive_le16dec(p + 28);
2789
2790         return (30 + filename_length + extra_length);
2791 }
2792
2793 static int
2794 zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
2795     struct zip_entry *rsrc)
2796 {
2797         struct zip *zip = (struct zip *)a->format->data;
2798         unsigned char *metadata, *mp;
2799         int64_t offset = archive_filter_bytes(&a->archive, 0);
2800         size_t remaining_bytes, metadata_bytes;
2801         ssize_t hsize;
2802         int ret = ARCHIVE_OK, eof;
2803
2804         switch(rsrc->compression) {
2805         case 0:  /* No compression. */
2806                 if (rsrc->uncompressed_size != rsrc->compressed_size) {
2807                         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2808                             "Malformed OS X metadata entry: inconsistent size");
2809                         return (ARCHIVE_FATAL);
2810                 }
2811 #ifdef HAVE_ZLIB_H
2812         case 8: /* Deflate compression. */
2813 #endif
2814                 break;
2815         default: /* Unsupported compression. */
2816                 /* Return a warning. */
2817                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2818                     "Unsupported ZIP compression method (%s)",
2819                     compression_name(rsrc->compression));
2820                 /* We can't decompress this entry, but we will
2821                  * be able to skip() it and try the next entry. */
2822                 return (ARCHIVE_WARN);
2823         }
2824
2825         if (rsrc->uncompressed_size > (4 * 1024 * 1024)) {
2826                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2827                     "Mac metadata is too large: %jd > 4M bytes",
2828                     (intmax_t)rsrc->uncompressed_size);
2829                 return (ARCHIVE_WARN);
2830         }
2831         if (rsrc->compressed_size > (4 * 1024 * 1024)) {
2832                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2833                     "Mac metadata is too large: %jd > 4M bytes",
2834                     (intmax_t)rsrc->compressed_size);
2835                 return (ARCHIVE_WARN);
2836         }
2837
2838         metadata = malloc((size_t)rsrc->uncompressed_size);
2839         if (metadata == NULL) {
2840                 archive_set_error(&a->archive, ENOMEM,
2841                     "Can't allocate memory for Mac metadata");
2842                 return (ARCHIVE_FATAL);
2843         }
2844
2845         if (offset < rsrc->local_header_offset)
2846                 __archive_read_consume(a, rsrc->local_header_offset - offset);
2847         else if (offset != rsrc->local_header_offset) {
2848                 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET);
2849         }
2850
2851         hsize = zip_get_local_file_header_size(a, 0);
2852         __archive_read_consume(a, hsize);
2853
2854         remaining_bytes = (size_t)rsrc->compressed_size;
2855         metadata_bytes = (size_t)rsrc->uncompressed_size;
2856         mp = metadata;
2857         eof = 0;
2858         while (!eof && remaining_bytes) {
2859                 const unsigned char *p;
2860                 ssize_t bytes_avail;
2861                 size_t bytes_used;
2862
2863                 p = __archive_read_ahead(a, 1, &bytes_avail);
2864                 if (p == NULL) {
2865                         archive_set_error(&a->archive,
2866                             ARCHIVE_ERRNO_FILE_FORMAT,
2867                             "Truncated ZIP file header");
2868                         ret = ARCHIVE_WARN;
2869                         goto exit_mac_metadata;
2870                 }
2871                 if ((size_t)bytes_avail > remaining_bytes)
2872                         bytes_avail = remaining_bytes;
2873                 switch(rsrc->compression) {
2874                 case 0:  /* No compression. */
2875                         if ((size_t)bytes_avail > metadata_bytes)
2876                                 bytes_avail = metadata_bytes;
2877                         memcpy(mp, p, bytes_avail);
2878                         bytes_used = (size_t)bytes_avail;
2879                         metadata_bytes -= bytes_used;
2880                         mp += bytes_used;
2881                         if (metadata_bytes == 0)
2882                                 eof = 1;
2883                         break;
2884 #ifdef HAVE_ZLIB_H
2885                 case 8: /* Deflate compression. */
2886                 {
2887                         int r;
2888
2889                         ret = zip_deflate_init(a, zip);
2890                         if (ret != ARCHIVE_OK)
2891                                 goto exit_mac_metadata;
2892                         zip->stream.next_in =
2893                             (Bytef *)(uintptr_t)(const void *)p;
2894                         zip->stream.avail_in = (uInt)bytes_avail;
2895                         zip->stream.total_in = 0;
2896                         zip->stream.next_out = mp;
2897                         zip->stream.avail_out = (uInt)metadata_bytes;
2898                         zip->stream.total_out = 0;
2899
2900                         r = inflate(&zip->stream, 0);
2901                         switch (r) {
2902                         case Z_OK:
2903                                 break;
2904                         case Z_STREAM_END:
2905                                 eof = 1;
2906                                 break;
2907                         case Z_MEM_ERROR:
2908                                 archive_set_error(&a->archive, ENOMEM,
2909                                     "Out of memory for ZIP decompression");
2910                                 ret = ARCHIVE_FATAL;
2911                                 goto exit_mac_metadata;
2912                         default:
2913                                 archive_set_error(&a->archive,
2914                                     ARCHIVE_ERRNO_MISC,
2915                                     "ZIP decompression failed (%d)", r);
2916                                 ret = ARCHIVE_FATAL;
2917                                 goto exit_mac_metadata;
2918                         }
2919                         bytes_used = zip->stream.total_in;
2920                         metadata_bytes -= zip->stream.total_out;
2921                         mp += zip->stream.total_out;
2922                         break;
2923                 }
2924 #endif
2925                 default:
2926                         bytes_used = 0;
2927                         break;
2928                 }
2929                 __archive_read_consume(a, bytes_used);
2930                 remaining_bytes -= bytes_used;
2931         }
2932         archive_entry_copy_mac_metadata(entry, metadata,
2933             (size_t)rsrc->uncompressed_size - metadata_bytes);
2934
2935 exit_mac_metadata:
2936         __archive_read_seek(a, offset, SEEK_SET);
2937         zip->decompress_init = 0;
2938         free(metadata);
2939         return (ret);
2940 }
2941
2942 static int
2943 archive_read_format_zip_seekable_read_header(struct archive_read *a,
2944         struct archive_entry *entry)
2945 {
2946         struct zip *zip = (struct zip *)a->format->data;
2947         struct zip_entry *rsrc;
2948         int64_t offset;
2949         int r, ret = ARCHIVE_OK;
2950
2951         /*
2952          * It should be sufficient to call archive_read_next_header() for
2953          * a reader to determine if an entry is encrypted or not. If the
2954          * encryption of an entry is only detectable when calling
2955          * archive_read_data(), so be it. We'll do the same check there
2956          * as well.
2957          */
2958         if (zip->has_encrypted_entries ==
2959                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
2960                 zip->has_encrypted_entries = 0;
2961
2962         a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
2963         if (a->archive.archive_format_name == NULL)
2964                 a->archive.archive_format_name = "ZIP";
2965
2966         if (zip->zip_entries == NULL) {
2967                 r = slurp_central_directory(a, zip);
2968                 if (r != ARCHIVE_OK)
2969                         return r;
2970                 /* Get first entry whose local header offset is lower than
2971                  * other entries in the archive file. */
2972                 zip->entry =
2973                     (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree);
2974         } else if (zip->entry != NULL) {
2975                 /* Get next entry in local header offset order. */
2976                 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate(
2977                     &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT);
2978         }
2979
2980         if (zip->entry == NULL)
2981                 return ARCHIVE_EOF;
2982
2983         if (zip->entry->rsrcname.s)
2984                 rsrc = (struct zip_entry *)__archive_rb_tree_find_node(
2985                     &zip->tree_rsrc, zip->entry->rsrcname.s);
2986         else
2987                 rsrc = NULL;
2988
2989         if (zip->cctx_valid)
2990                 archive_decrypto_aes_ctr_release(&zip->cctx);
2991         if (zip->hctx_valid)
2992                 archive_hmac_sha1_cleanup(&zip->hctx);
2993         zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
2994         __archive_read_reset_passphrase(a);
2995
2996         /* File entries are sorted by the header offset, we should mostly
2997          * use __archive_read_consume to advance a read point to avoid redundant
2998          * data reading.  */
2999         offset = archive_filter_bytes(&a->archive, 0);
3000         if (offset < zip->entry->local_header_offset)
3001                 __archive_read_consume(a,
3002                     zip->entry->local_header_offset - offset);
3003         else if (offset != zip->entry->local_header_offset) {
3004                 __archive_read_seek(a, zip->entry->local_header_offset,
3005                     SEEK_SET);
3006         }
3007         zip->unconsumed = 0;
3008         r = zip_read_local_file_header(a, entry, zip);
3009         if (r != ARCHIVE_OK)
3010                 return r;
3011         if (rsrc) {
3012                 int ret2 = zip_read_mac_metadata(a, entry, rsrc);
3013                 if (ret2 < ret)
3014                         ret = ret2;
3015         }
3016         return (ret);
3017 }
3018
3019 /*
3020  * We're going to seek for the next header anyway, so we don't
3021  * need to bother doing anything here.
3022  */
3023 static int
3024 archive_read_format_zip_read_data_skip_seekable(struct archive_read *a)
3025 {
3026         struct zip *zip;
3027         zip = (struct zip *)(a->format->data);
3028
3029         zip->unconsumed = 0;
3030         return (ARCHIVE_OK);
3031 }
3032
3033 int
3034 archive_read_support_format_zip_seekable(struct archive *_a)
3035 {
3036         struct archive_read *a = (struct archive_read *)_a;
3037         struct zip *zip;
3038         int r;
3039
3040         archive_check_magic(_a, ARCHIVE_READ_MAGIC,
3041             ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable");
3042
3043         zip = (struct zip *)calloc(1, sizeof(*zip));
3044         if (zip == NULL) {
3045                 archive_set_error(&a->archive, ENOMEM,
3046                     "Can't allocate zip data");
3047                 return (ARCHIVE_FATAL);
3048         }
3049
3050 #ifdef HAVE_COPYFILE_H
3051         /* Set this by default on Mac OS. */
3052         zip->process_mac_extensions = 1;
3053 #endif
3054
3055         /*
3056          * Until enough data has been read, we cannot tell about
3057          * any encrypted entries yet.
3058          */
3059         zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
3060         zip->crc32func = real_crc32;
3061
3062         r = __archive_read_register_format(a,
3063             zip,
3064             "zip",
3065             archive_read_format_zip_seekable_bid,
3066             archive_read_format_zip_options,
3067             archive_read_format_zip_seekable_read_header,
3068             archive_read_format_zip_read_data,
3069             archive_read_format_zip_read_data_skip_seekable,
3070             NULL,
3071             archive_read_format_zip_cleanup,
3072             archive_read_support_format_zip_capabilities_seekable,
3073             archive_read_format_zip_has_encrypted_entries);
3074
3075         if (r != ARCHIVE_OK)
3076                 free(zip);
3077         return (ARCHIVE_OK);
3078 }