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 the mode is totally empty, set some sane default. */
 868         if (zip_entry->mode == 0) {
 869                 zip_entry->mode |= 0664;
 870         }
 871
 872         /* Make sure that entries with a trailing '/' are marked as directories
 873          * even if the External File Attributes contains bogus values.  If this
 874          * is not a directory and there is no type, assume regularfile. */
 875         if ((zip_entry->mode & AE_IFMT) != AE_IFDIR) {
 876                 int has_slash;
 877
 878                 wp = archive_entry_pathname_w(entry);
 879                 if (wp != NULL) {
 880                         len = wcslen(wp);
 881                         has_slash = len > 0 && wp[len - 1] == L'/';
 882                 } else {
 883                         cp = archive_entry_pathname(entry);
 884                         len = (cp != NULL)?strlen(cp):0;
 885                         has_slash = len > 0 && cp[len - 1] == '/';
 886                 }
 887                 /* Correct file type as needed. */
 888                 if (has_slash) {
 889                         zip_entry->mode &= ~AE_IFMT;
 890                         zip_entry->mode |= AE_IFDIR;
 891                         zip_entry->mode |= 0111;
 892                 } else if ((zip_entry->mode & AE_IFMT) == 0) {
 893                         zip_entry->mode |= AE_IFREG;
 894                 }
 895         }
 896
 897         /* Make sure directories end in '/' */
 898         if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) {
 899                 wp = archive_entry_pathname_w(entry);
 900                 if (wp != NULL) {
 901                         len = wcslen(wp);
 902                         if (len > 0 && wp[len - 1] != L'/') {
 903                                 struct archive_wstring s;
 904                                 archive_string_init(&s);
 905                                 archive_wstrcat(&s, wp);
 906                                 archive_wstrappend_wchar(&s, L'/');
 907                                 archive_entry_copy_pathname_w(entry, s.s);
 908                         }
 909                 } else {
 910                         cp = archive_entry_pathname(entry);
 911                         len = (cp != NULL)?strlen(cp):0;
 912                         if (len > 0 && cp[len - 1] != '/') {
 913                                 struct archive_string s;
 914                                 archive_string_init(&s);
 915                                 archive_strcat(&s, cp);
 916                                 archive_strappend_char(&s, '/');
 917                                 archive_entry_set_pathname(entry, s.s);
 918                         }
 919                 }
 920         }
 921
 922         if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) {
 923                 /* If this came from the central dir, it's size info
 924                  * is definitive, so ignore the length-at-end flag. */
 925                 zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END;
 926                 /* If local header is missing a value, use the one from
 927                    the central directory.  If both have it, warn about
 928                    mismatches. */
 929                 if (zip_entry->crc32 == 0) {
 930                         zip_entry->crc32 = zip_entry_central_dir.crc32;
 931                 } else if (!zip->ignore_crc32
 932                     && zip_entry->crc32 != zip_entry_central_dir.crc32) {
 933                         archive_set_error(&a->archive,
 934                             ARCHIVE_ERRNO_FILE_FORMAT,
 935                             "Inconsistent CRC32 values");
 936                         ret = ARCHIVE_WARN;
 937                 }
 938                 if (zip_entry->compressed_size == 0) {
 939                         zip_entry->compressed_size
 940                             = zip_entry_central_dir.compressed_size;
 941                 } else if (zip_entry->compressed_size
 942                     != zip_entry_central_dir.compressed_size) {
 943                         archive_set_error(&a->archive,
 944                             ARCHIVE_ERRNO_FILE_FORMAT,
 945                             "Inconsistent compressed size: "
 946                             "%jd in central directory, %jd in local header",
 947                             (intmax_t)zip_entry_central_dir.compressed_size,
 948                             (intmax_t)zip_entry->compressed_size);
 949                         ret = ARCHIVE_WARN;
 950                 }
 951                 if (zip_entry->uncompressed_size == 0) {
 952                         zip_entry->uncompressed_size
 953                             = zip_entry_central_dir.uncompressed_size;
 954                 } else if (zip_entry->uncompressed_size
 955                     != zip_entry_central_dir.uncompressed_size) {
 956                         archive_set_error(&a->archive,
 957                             ARCHIVE_ERRNO_FILE_FORMAT,
 958                             "Inconsistent uncompressed size: "
 959                             "%jd in central directory, %jd in local header",
 960                             (intmax_t)zip_entry_central_dir.uncompressed_size,
 961                             (intmax_t)zip_entry->uncompressed_size);
 962                         ret = ARCHIVE_WARN;
 963                 }
 964         }
 965
 966         /* Populate some additional entry fields: */
 967         archive_entry_set_mode(entry, zip_entry->mode);
 968         archive_entry_set_uid(entry, zip_entry->uid);
 969         archive_entry_set_gid(entry, zip_entry->gid);
 970         archive_entry_set_mtime(entry, zip_entry->mtime, 0);
 971         archive_entry_set_ctime(entry, zip_entry->ctime, 0);
 972         archive_entry_set_atime(entry, zip_entry->atime, 0);
 973
 974         if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) {
 975                 size_t linkname_length;
 976
 977                 if (zip_entry->compressed_size > 64 * 1024) {
 978                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 979                             "Zip file with oversized link entry");
 980                         return ARCHIVE_FATAL;
 981                 }
 982
 983                 linkname_length = (size_t)zip_entry->compressed_size;
 984
 985                 archive_entry_set_size(entry, 0);
 986                 p = __archive_read_ahead(a, linkname_length, NULL);
 987                 if (p == NULL) {
 988                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 989                             "Truncated Zip file");
 990                         return ARCHIVE_FATAL;
 991                 }
 992
 993                 sconv = zip->sconv;
 994                 if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME))
 995                         sconv = zip->sconv_utf8;
 996                 if (sconv == NULL)
 997                         sconv = zip->sconv_default;
 998                 if (archive_entry_copy_symlink_l(entry, p, linkname_length,
 999                     sconv) != 0) {
1000                         if (errno != ENOMEM && sconv == zip->sconv_utf8 &&
1001                             (zip->entry->zip_flags & ZIP_UTF8_NAME))
1002                             archive_entry_copy_symlink_l(entry, p,
1003                                 linkname_length, NULL);
1004                         if (errno == ENOMEM) {
1005                                 archive_set_error(&a->archive, ENOMEM,
1006                                     "Can't allocate memory for Symlink");
1007                                 return (ARCHIVE_FATAL);
1008                         }
1009                         /*
1010                          * Since there is no character-set regulation for
1011                          * symlink name, do not report the conversion error
1012                          * in an automatic conversion.
1013                          */
1014                         if (sconv != zip->sconv_utf8 ||
1015                             (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) {
1016                                 archive_set_error(&a->archive,
1017                                     ARCHIVE_ERRNO_FILE_FORMAT,
1018                                     "Symlink cannot be converted "
1019                                     "from %s to current locale.",
1020                                     archive_string_conversion_charset_name(
1021                                         sconv));
1022                                 ret = ARCHIVE_WARN;
1023                         }
1024                 }
1025                 zip_entry->uncompressed_size = zip_entry->compressed_size = 0;
1026
1027                 if (__archive_read_consume(a, linkname_length) < 0) {
1028                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1029                             "Read error skipping symlink target name");
1030                         return ARCHIVE_FATAL;
1031                 }
1032         } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1033             || zip_entry->uncompressed_size > 0) {
1034                 /* Set the size only if it's meaningful. */
1035                 archive_entry_set_size(entry, zip_entry->uncompressed_size);
1036         }
1037         zip->entry_bytes_remaining = zip_entry->compressed_size;
1038
1039         /* If there's no body, force read_data() to return EOF immediately. */
1040         if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1041             && zip->entry_bytes_remaining < 1)
1042                 zip->end_of_entry = 1;
1043
1044         /* Set up a more descriptive format name. */
1045         archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)",
1046             version / 10, version % 10,
1047             compression_name(zip->entry->compression));
1048         a->archive.archive_format_name = zip->format_name.s;
1049
1050         return (ret);
1051 }
1052
1053 static int
1054 check_authentication_code(struct archive_read *a, const void *_p)
1055 {
1056         struct zip *zip = (struct zip *)(a->format->data);
1057
1058         /* Check authentication code. */
1059         if (zip->hctx_valid) {
1060                 const void *p;
1061                 uint8_t hmac[20];
1062                 size_t hmac_len = 20;
1063                 int cmp;
1064
1065                 archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len);
1066                 if (_p == NULL) {
1067                         /* Read authentication code. */
1068                         p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL);
1069                         if (p == NULL) {
1070                                 archive_set_error(&a->archive,
1071                                     ARCHIVE_ERRNO_FILE_FORMAT,
1072                                     "Truncated ZIP file data");
1073                                 return (ARCHIVE_FATAL);
1074                         }
1075                 } else {
1076                         p = _p;
1077                 }
1078                 cmp = memcmp(hmac, p, AUTH_CODE_SIZE);
1079                 __archive_read_consume(a, AUTH_CODE_SIZE);
1080                 if (cmp != 0) {
1081                         archive_set_error(&a->archive,
1082                             ARCHIVE_ERRNO_MISC,
1083                             "ZIP bad Authentication code");
1084                         return (ARCHIVE_WARN);
1085                 }
1086         }
1087         return (ARCHIVE_OK);
1088 }
1089
1090 /*
1091  * Read "uncompressed" data.  There are three cases:
1092  *  1) We know the size of the data.  This is always true for the
1093  * seeking reader (we've examined the Central Directory already).
1094  *  2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred.
1095  * Info-ZIP seems to do this; we know the size but have to grab
1096  * the CRC from the data descriptor afterwards.
1097  *  3) We're streaming and ZIP_LENGTH_AT_END was specified and
1098  * we have no size information.  In this case, we can do pretty
1099  * well by watching for the data descriptor record.  The data
1100  * descriptor is 16 bytes and includes a computed CRC that should
1101  * provide a strong check.
1102  *
1103  * TODO: Technically, the PK\007\010 signature is optional.
1104  * In the original spec, the data descriptor contained CRC
1105  * and size fields but had no leading signature.  In practice,
1106  * newer writers seem to provide the signature pretty consistently.
1107  *
1108  * For uncompressed data, the PK\007\010 marker seems essential
1109  * to be sure we've actually seen the end of the entry.
1110  *
1111  * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets
1112  * zip->end_of_entry if it consumes all of the data.
1113  */
1114 static int
1115 zip_read_data_none(struct archive_read *a, const void **_buff,
1116     size_t *size, int64_t *offset)
1117 {
1118         struct zip *zip;
1119         const char *buff;
1120         ssize_t bytes_avail;
1121         int r;
1122
1123         (void)offset; /* UNUSED */
1124
1125         zip = (struct zip *)(a->format->data);
1126
1127         if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) {
1128                 const char *p;
1129                 ssize_t grabbing_bytes = 24;
1130
1131                 if (zip->hctx_valid)
1132                         grabbing_bytes += AUTH_CODE_SIZE;
1133                 /* Grab at least 24 bytes. */
1134                 buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail);
1135                 if (bytes_avail < grabbing_bytes) {
1136                         /* Zip archives have end-of-archive markers
1137                            that are longer than this, so a failure to get at
1138                            least 24 bytes really does indicate a truncated
1139                            file. */
1140                         archive_set_error(&a->archive,
1141                             ARCHIVE_ERRNO_FILE_FORMAT,
1142                             "Truncated ZIP file data");
1143                         return (ARCHIVE_FATAL);
1144                 }
1145                 /* Check for a complete PK\007\010 signature, followed
1146                  * by the correct 4-byte CRC. */
1147                 p = buff;
1148                 if (zip->hctx_valid)
1149                         p += AUTH_CODE_SIZE;
1150                 if (p[0] == 'P' && p[1] == 'K'
1151                     && p[2] == '\007' && p[3] == '\010'
1152                     && (archive_le32dec(p + 4) == zip->entry_crc32
1153                         || zip->ignore_crc32
1154                         || (zip->hctx_valid
1155                          && zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) {
1156                         if (zip->entry->flags & LA_USED_ZIP64) {
1157                                 zip->entry->crc32 = archive_le32dec(p + 4);
1158                                 zip->entry->compressed_size =
1159                                         archive_le64dec(p + 8);
1160                                 zip->entry->uncompressed_size =
1161                                         archive_le64dec(p + 16);
1162                                 zip->unconsumed = 24;
1163                         } else {
1164                                 zip->entry->crc32 = archive_le32dec(p + 4);
1165                                 zip->entry->compressed_size =
1166                                         archive_le32dec(p + 8);
1167                                 zip->entry->uncompressed_size =
1168                                         archive_le32dec(p + 12);
1169                                 zip->unconsumed = 16;
1170                         }
1171                         if (zip->hctx_valid) {
1172                                 r = check_authentication_code(a, buff);
1173                                 if (r != ARCHIVE_OK)
1174                                         return (r);
1175                         }
1176                         zip->end_of_entry = 1;
1177                         return (ARCHIVE_OK);
1178                 }
1179                 /* If not at EOF, ensure we consume at least one byte. */
1180                 ++p;
1181
1182                 /* Scan forward until we see where a PK\007\010 signature
1183                  * might be. */
1184                 /* Return bytes up until that point.  On the next call,
1185                  * the code above will verify the data descriptor. */
1186                 while (p < buff + bytes_avail - 4) {
1187                         if (p[3] == 'P') { p += 3; }
1188                         else if (p[3] == 'K') { p += 2; }
1189                         else if (p[3] == '\007') { p += 1; }
1190                         else if (p[3] == '\010' && p[2] == '\007'
1191                             && p[1] == 'K' && p[0] == 'P') {
1192                                 if (zip->hctx_valid)
1193                                         p -= AUTH_CODE_SIZE;
1194                                 break;
1195                         } else { p += 4; }
1196                 }
1197                 bytes_avail = p - buff;
1198         } else {
1199                 if (zip->entry_bytes_remaining == 0) {
1200                         zip->end_of_entry = 1;
1201                         if (zip->hctx_valid) {
1202                                 r = check_authentication_code(a, NULL);
1203                                 if (r != ARCHIVE_OK)
1204                                         return (r);
1205                         }
1206                         return (ARCHIVE_OK);
1207                 }
1208                 /* Grab a bunch of bytes. */
1209                 buff = __archive_read_ahead(a, 1, &bytes_avail);
1210                 if (bytes_avail <= 0) {
1211                         archive_set_error(&a->archive,
1212                             ARCHIVE_ERRNO_FILE_FORMAT,
1213                             "Truncated ZIP file data");
1214                         return (ARCHIVE_FATAL);
1215                 }
1216                 if (bytes_avail > zip->entry_bytes_remaining)
1217                         bytes_avail = (ssize_t)zip->entry_bytes_remaining;
1218         }
1219         if (zip->tctx_valid || zip->cctx_valid) {
1220                 size_t dec_size = bytes_avail;
1221
1222                 if (dec_size > zip->decrypted_buffer_size)
1223                         dec_size = zip->decrypted_buffer_size;
1224                 if (zip->tctx_valid) {
1225                         trad_enc_decrypt_update(&zip->tctx,
1226                             (const uint8_t *)buff, dec_size,
1227                             zip->decrypted_buffer, dec_size);
1228                 } else {
1229                         size_t dsize = dec_size;
1230                         archive_hmac_sha1_update(&zip->hctx,
1231                             (const uint8_t *)buff, dec_size);
1232                         archive_decrypto_aes_ctr_update(&zip->cctx,
1233                             (const uint8_t *)buff, dec_size,
1234                             zip->decrypted_buffer, &dsize);
1235                 }
1236                 bytes_avail = dec_size;
1237                 buff = (const char *)zip->decrypted_buffer;
1238         }
1239         *size = bytes_avail;
1240         zip->entry_bytes_remaining -= bytes_avail;
1241         zip->entry_uncompressed_bytes_read += bytes_avail;
1242         zip->entry_compressed_bytes_read += bytes_avail;
1243         zip->unconsumed += bytes_avail;
1244         *_buff = buff;
1245         return (ARCHIVE_OK);
1246 }
1247
1248 #ifdef HAVE_ZLIB_H
1249 static int
1250 zip_deflate_init(struct archive_read *a, struct zip *zip)
1251 {
1252         int r;
1253
1254         /* If we haven't yet read any data, initialize the decompressor. */
1255         if (!zip->decompress_init) {
1256                 if (zip->stream_valid)
1257                         r = inflateReset(&zip->stream);
1258                 else
1259                         r = inflateInit2(&zip->stream,
1260                             -15 /* Don't check for zlib header */);
1261                 if (r != Z_OK) {
1262                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1263                             "Can't initialize ZIP decompression.");
1264                         return (ARCHIVE_FATAL);
1265                 }
1266                 /* Stream structure has been set up. */
1267                 zip->stream_valid = 1;
1268                 /* We've initialized decompression for this stream. */
1269                 zip->decompress_init = 1;
1270         }
1271         return (ARCHIVE_OK);
1272 }
1273
1274 static int
1275 zip_read_data_deflate(struct archive_read *a, const void **buff,
1276     size_t *size, int64_t *offset)
1277 {
1278         struct zip *zip;
1279         ssize_t bytes_avail;
1280         const void *compressed_buff, *sp;
1281         int r;
1282
1283         (void)offset; /* UNUSED */
1284
1285         zip = (struct zip *)(a->format->data);
1286
1287         /* If the buffer hasn't been allocated, allocate it now. */
1288         if (zip->uncompressed_buffer == NULL) {
1289                 zip->uncompressed_buffer_size = 256 * 1024;
1290                 zip->uncompressed_buffer
1291                     = (unsigned char *)malloc(zip->uncompressed_buffer_size);
1292                 if (zip->uncompressed_buffer == NULL) {
1293                         archive_set_error(&a->archive, ENOMEM,
1294                             "No memory for ZIP decompression");
1295                         return (ARCHIVE_FATAL);
1296                 }
1297         }
1298
1299         r = zip_deflate_init(a, zip);
1300         if (r != ARCHIVE_OK)
1301                 return (r);
1302
1303         /*
1304          * Note: '1' here is a performance optimization.
1305          * Recall that the decompression layer returns a count of
1306          * available bytes; asking for more than that forces the
1307          * decompressor to combine reads by copying data.
1308          */
1309         compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail);
1310         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1311             && bytes_avail > zip->entry_bytes_remaining) {
1312                 bytes_avail = (ssize_t)zip->entry_bytes_remaining;
1313         }
1314         if (bytes_avail < 0) {
1315                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1316                     "Truncated ZIP file body");
1317                 return (ARCHIVE_FATAL);
1318         }
1319
1320         if (zip->tctx_valid || zip->cctx_valid) {
1321                 if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) {
1322                         size_t buff_remaining =
1323                             (zip->decrypted_buffer + zip->decrypted_buffer_size)
1324                             - (zip->decrypted_ptr + zip->decrypted_bytes_remaining);
1325
1326                         if (buff_remaining > (size_t)bytes_avail)
1327                                 buff_remaining = (size_t)bytes_avail;
1328
1329                         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) &&
1330                               zip->entry_bytes_remaining > 0) {
1331                                 if ((int64_t)(zip->decrypted_bytes_remaining
1332                                     + buff_remaining)
1333                                       > zip->entry_bytes_remaining) {
1334                                         if (zip->entry_bytes_remaining <
1335                                               (int64_t)zip->decrypted_bytes_remaining)
1336                                                 buff_remaining = 0;
1337                                         else
1338                                                 buff_remaining =
1339                                                     (size_t)zip->entry_bytes_remaining
1340                                                       - zip->decrypted_bytes_remaining;
1341                                 }
1342                         }
1343                         if (buff_remaining > 0) {
1344                                 if (zip->tctx_valid) {
1345                                         trad_enc_decrypt_update(&zip->tctx,
1346                                             compressed_buff, buff_remaining,
1347                                             zip->decrypted_ptr
1348                                               + zip->decrypted_bytes_remaining,
1349                                             buff_remaining);
1350                                 } else {
1351                                         size_t dsize = buff_remaining;
1352                                         archive_decrypto_aes_ctr_update(
1353                                             &zip->cctx,
1354                                             compressed_buff, buff_remaining,
1355                                             zip->decrypted_ptr
1356                                               + zip->decrypted_bytes_remaining,
1357                                             &dsize);
1358                                 }
1359                                 zip->decrypted_bytes_remaining += buff_remaining;
1360                         }
1361                 }
1362                 bytes_avail = zip->decrypted_bytes_remaining;
1363                 compressed_buff = (const char *)zip->decrypted_ptr;
1364         }
1365
1366         /*
1367          * A bug in zlib.h: stream.next_in should be marked 'const'
1368          * but isn't (the library never alters data through the
1369          * next_in pointer, only reads it).  The result: this ugly
1370          * cast to remove 'const'.
1371          */
1372         zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff;
1373         zip->stream.avail_in = (uInt)bytes_avail;
1374         zip->stream.total_in = 0;
1375         zip->stream.next_out = zip->uncompressed_buffer;
1376         zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size;
1377         zip->stream.total_out = 0;
1378
1379         r = inflate(&zip->stream, 0);
1380         switch (r) {
1381         case Z_OK:
1382                 break;
1383         case Z_STREAM_END:
1384                 zip->end_of_entry = 1;
1385                 break;
1386         case Z_MEM_ERROR:
1387                 archive_set_error(&a->archive, ENOMEM,
1388                     "Out of memory for ZIP decompression");
1389                 return (ARCHIVE_FATAL);
1390         default:
1391                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1392                     "ZIP decompression failed (%d)", r);
1393                 return (ARCHIVE_FATAL);
1394         }
1395
1396         /* Consume as much as the compressor actually used. */
1397         bytes_avail = zip->stream.total_in;
1398         if (zip->tctx_valid || zip->cctx_valid) {
1399                 zip->decrypted_bytes_remaining -= bytes_avail;
1400                 if (zip->decrypted_bytes_remaining == 0)
1401                         zip->decrypted_ptr = zip->decrypted_buffer;
1402                 else
1403                         zip->decrypted_ptr += bytes_avail;
1404         }
1405         /* Calculate compressed data as much as we used.*/
1406         if (zip->hctx_valid)
1407                 archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail);
1408         __archive_read_consume(a, bytes_avail);
1409         zip->entry_bytes_remaining -= bytes_avail;
1410         zip->entry_compressed_bytes_read += bytes_avail;
1411
1412         *size = zip->stream.total_out;
1413         zip->entry_uncompressed_bytes_read += zip->stream.total_out;
1414         *buff = zip->uncompressed_buffer;
1415
1416         if (zip->end_of_entry && zip->hctx_valid) {
1417                 r = check_authentication_code(a, NULL);
1418                 if (r != ARCHIVE_OK)
1419                         return (r);
1420         }
1421
1422         if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
1423                 const char *p;
1424
1425                 if (NULL == (p = __archive_read_ahead(a, 24, NULL))) {
1426                         archive_set_error(&a->archive,
1427                             ARCHIVE_ERRNO_FILE_FORMAT,
1428                             "Truncated ZIP end-of-file record");
1429                         return (ARCHIVE_FATAL);
1430                 }
1431                 /* Consume the optional PK\007\010 marker. */
1432                 if (p[0] == 'P' && p[1] == 'K' &&
1433                     p[2] == '\007' && p[3] == '\010') {
1434                         p += 4;
1435                         zip->unconsumed = 4;
1436                 }
1437                 if (zip->entry->flags & LA_USED_ZIP64) {
1438                         zip->entry->crc32 = archive_le32dec(p);
1439                         zip->entry->compressed_size = archive_le64dec(p + 4);
1440                         zip->entry->uncompressed_size = archive_le64dec(p + 12);
1441                         zip->unconsumed += 20;
1442                 } else {
1443                         zip->entry->crc32 = archive_le32dec(p);
1444                         zip->entry->compressed_size = archive_le32dec(p + 4);
1445                         zip->entry->uncompressed_size = archive_le32dec(p + 8);
1446                         zip->unconsumed += 12;
1447                 }
1448         }
1449
1450         return (ARCHIVE_OK);
1451 }
1452 #endif
1453
1454 static int
1455 read_decryption_header(struct archive_read *a)
1456 {
1457         struct zip *zip = (struct zip *)(a->format->data);
1458         const char *p;
1459         unsigned int remaining_size;
1460         unsigned int ts;
1461
1462         /*
1463          * Read an initialization vector data field.
1464          */
1465         p = __archive_read_ahead(a, 2, NULL);
1466         if (p == NULL)
1467                 goto truncated;
1468         ts = zip->iv_size;
1469         zip->iv_size = archive_le16dec(p);
1470         __archive_read_consume(a, 2);
1471         if (ts < zip->iv_size) {
1472                 free(zip->iv);
1473                 zip->iv = NULL;
1474         }
1475         p = __archive_read_ahead(a, zip->iv_size, NULL);
1476         if (p == NULL)
1477                 goto truncated;
1478         if (zip->iv == NULL) {
1479                 zip->iv = malloc(zip->iv_size);
1480                 if (zip->iv == NULL)
1481                         goto nomem;
1482         }
1483         memcpy(zip->iv, p, zip->iv_size);
1484         __archive_read_consume(a, zip->iv_size);
1485
1486         /*
1487          * Read a size of remaining decryption header field.
1488          */
1489         p = __archive_read_ahead(a, 14, NULL);
1490         if (p == NULL)
1491                 goto truncated;
1492         remaining_size = archive_le32dec(p);
1493         if (remaining_size < 16 || remaining_size > (1 << 18))
1494                 goto corrupted;
1495
1496         /* Check if format version is supported. */
1497         if (archive_le16dec(p+4) != 3) {
1498                 archive_set_error(&a->archive,
1499                     ARCHIVE_ERRNO_FILE_FORMAT,
1500                     "Unsupported encryption format version: %u",
1501                     archive_le16dec(p+4));
1502                 return (ARCHIVE_FAILED);
1503         }
1504
1505         /*
1506          * Read an encryption algorithm field.
1507          */
1508         zip->alg_id = archive_le16dec(p+6);
1509         switch (zip->alg_id) {
1510         case 0x6601:/* DES */
1511         case 0x6602:/* RC2 */
1512         case 0x6603:/* 3DES 168 */
1513         case 0x6609:/* 3DES 112 */
1514         case 0x660E:/* AES 128 */
1515         case 0x660F:/* AES 192 */
1516         case 0x6610:/* AES 256 */
1517         case 0x6702:/* RC2 (version >= 5.2) */
1518         case 0x6720:/* Blowfish */
1519         case 0x6721:/* Twofish */
1520         case 0x6801:/* RC4 */
1521                 /* Suuported encryption algorithm. */
1522                 break;
1523         default:
1524                 archive_set_error(&a->archive,
1525                     ARCHIVE_ERRNO_FILE_FORMAT,
1526                     "Unknown encryption algorithm: %u", zip->alg_id);
1527                 return (ARCHIVE_FAILED);
1528         }
1529
1530         /*
1531          * Read a bit length field.
1532          */
1533         zip->bit_len = archive_le16dec(p+8);
1534
1535         /*
1536          * Read a flags field.
1537          */
1538         zip->flags = archive_le16dec(p+10);
1539         switch (zip->flags & 0xf000) {
1540         case 0x0001: /* Password is required to decrypt. */
1541         case 0x0002: /* Certificates only. */
1542         case 0x0003: /* Password or certificate required to decrypt. */
1543                 break;
1544         default:
1545                 archive_set_error(&a->archive,
1546                     ARCHIVE_ERRNO_FILE_FORMAT,
1547                     "Unknown encryption flag: %u", zip->flags);
1548                 return (ARCHIVE_FAILED);
1549         }
1550         if ((zip->flags & 0xf000) == 0 ||
1551             (zip->flags & 0xf000) == 0x4000) {
1552                 archive_set_error(&a->archive,
1553                     ARCHIVE_ERRNO_FILE_FORMAT,
1554                     "Unknown encryption flag: %u", zip->flags);
1555                 return (ARCHIVE_FAILED);
1556         }
1557
1558         /*
1559          * Read an encrypted random data field.
1560          */
1561         ts = zip->erd_size;
1562         zip->erd_size = archive_le16dec(p+12);
1563         __archive_read_consume(a, 14);
1564         if ((zip->erd_size & 0xf) != 0 ||
1565             (zip->erd_size + 16) > remaining_size ||
1566             (zip->erd_size + 16) < zip->erd_size)
1567                 goto corrupted;
1568
1569         if (ts < zip->erd_size) {
1570                 free(zip->erd);
1571                 zip->erd = NULL;
1572         }
1573         p = __archive_read_ahead(a, zip->erd_size, NULL);
1574         if (p == NULL)
1575                 goto truncated;
1576         if (zip->erd == NULL) {
1577                 zip->erd = malloc(zip->erd_size);
1578                 if (zip->erd == NULL)
1579                         goto nomem;
1580         }
1581         memcpy(zip->erd, p, zip->erd_size);
1582         __archive_read_consume(a, zip->erd_size);
1583
1584         /*
1585          * Read a reserved data field.
1586          */
1587         p = __archive_read_ahead(a, 4, NULL);
1588         if (p == NULL)
1589                 goto truncated;
1590         /* Reserved data size should be zero. */
1591         if (archive_le32dec(p) != 0)
1592                 goto corrupted;
1593         __archive_read_consume(a, 4);
1594
1595         /*
1596          * Read a password validation data field.
1597          */
1598         p = __archive_read_ahead(a, 2, NULL);
1599         if (p == NULL)
1600                 goto truncated;
1601         ts = zip->v_size;
1602         zip->v_size = archive_le16dec(p);
1603         __archive_read_consume(a, 2);
1604         if ((zip->v_size & 0x0f) != 0 ||
1605             (zip->erd_size + zip->v_size + 16) > remaining_size ||
1606             (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size))
1607                 goto corrupted;
1608         if (ts < zip->v_size) {
1609                 free(zip->v_data);
1610                 zip->v_data = NULL;
1611         }
1612         p = __archive_read_ahead(a, zip->v_size, NULL);
1613         if (p == NULL)
1614                 goto truncated;
1615         if (zip->v_data == NULL) {
1616                 zip->v_data = malloc(zip->v_size);
1617                 if (zip->v_data == NULL)
1618                         goto nomem;
1619         }
1620         memcpy(zip->v_data, p, zip->v_size);
1621         __archive_read_consume(a, zip->v_size);
1622
1623         p = __archive_read_ahead(a, 4, NULL);
1624         if (p == NULL)
1625                 goto truncated;
1626         zip->v_crc32 = archive_le32dec(p);
1627         __archive_read_consume(a, 4);
1628
1629         /*return (ARCHIVE_OK);
1630          * This is not fully implemnted yet.*/
1631         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1632             "Encrypted file is unsupported");
1633         return (ARCHIVE_FAILED);
1634 truncated:
1635         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1636             "Truncated ZIP file data");
1637         return (ARCHIVE_FATAL);
1638 corrupted:
1639         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1640             "Corrupted ZIP file data");
1641         return (ARCHIVE_FATAL);
1642 nomem:
1643         archive_set_error(&a->archive, ENOMEM,
1644             "No memory for ZIP decryption");
1645         return (ARCHIVE_FATAL);
1646 }
1647
1648 static int
1649 zip_alloc_decryption_buffer(struct archive_read *a)
1650 {
1651         struct zip *zip = (struct zip *)(a->format->data);
1652         size_t bs = 256 * 1024;
1653
1654         if (zip->decrypted_buffer == NULL) {
1655                 zip->decrypted_buffer_size = bs;
1656                 zip->decrypted_buffer = malloc(bs);
1657                 if (zip->decrypted_buffer == NULL) {
1658                         archive_set_error(&a->archive, ENOMEM,
1659                             "No memory for ZIP decryption");
1660                         return (ARCHIVE_FATAL);
1661                 }
1662         }
1663         zip->decrypted_ptr = zip->decrypted_buffer;
1664         return (ARCHIVE_OK);
1665 }
1666
1667 static int
1668 init_traditional_PKWARE_decryption(struct archive_read *a)
1669 {
1670         struct zip *zip = (struct zip *)(a->format->data);
1671         const void *p;
1672         int retry;
1673         int r;
1674
1675         if (zip->tctx_valid)
1676                 return (ARCHIVE_OK);
1677
1678         /*
1679            Read the 12 bytes encryption header stored at
1680            the start of the data area.
1681          */
1682 #define ENC_HEADER_SIZE 12
1683         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1684             && zip->entry_bytes_remaining < ENC_HEADER_SIZE) {
1685                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1686                     "Truncated Zip encrypted body: only %jd bytes available",
1687                     (intmax_t)zip->entry_bytes_remaining);
1688                 return (ARCHIVE_FATAL);
1689         }
1690
1691         p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL);
1692         if (p == NULL) {
1693                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1694                     "Truncated ZIP file data");
1695                 return (ARCHIVE_FATAL);
1696         }
1697
1698         for (retry = 0;; retry++) {
1699                 const char *passphrase;
1700                 uint8_t crcchk;
1701
1702                 passphrase = __archive_read_next_passphrase(a);
1703                 if (passphrase == NULL) {
1704                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1705                             (retry > 0)?
1706                                 "Incorrect passphrase":
1707                                 "Passphrase required for this entry");
1708                         return (ARCHIVE_FAILED);
1709                 }
1710
1711                 /*
1712                  * Initialize ctx for Traditional PKWARE Decyption.
1713                  */
1714                 r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase),
1715                         p, ENC_HEADER_SIZE, &crcchk);
1716                 if (r == 0 && crcchk == zip->entry->decdat)
1717                         break;/* The passphrase is OK. */
1718                 if (retry > 10000) {
1719                         /* Avoid infinity loop. */
1720                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1721                             "Too many incorrect passphrases");
1722                         return (ARCHIVE_FAILED);
1723                 }
1724         }
1725
1726         __archive_read_consume(a, ENC_HEADER_SIZE);
1727         zip->tctx_valid = 1;
1728         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
1729             zip->entry_bytes_remaining -= ENC_HEADER_SIZE;
1730         }
1731         /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/
1732         zip->entry_compressed_bytes_read += ENC_HEADER_SIZE;
1733         zip->decrypted_bytes_remaining = 0;
1734
1735         return (zip_alloc_decryption_buffer(a));
1736 #undef ENC_HEADER_SIZE
1737 }
1738
1739 static int
1740 init_WinZip_AES_decryption(struct archive_read *a)
1741 {
1742         struct zip *zip = (struct zip *)(a->format->data);
1743         const void *p;
1744         const uint8_t *pv;
1745         size_t key_len, salt_len;
1746         uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE];
1747         int retry;
1748         int r;
1749
1750         if (zip->cctx_valid || zip->hctx_valid)
1751                 return (ARCHIVE_OK);
1752
1753         switch (zip->entry->aes_extra.strength) {
1754         case 1: salt_len = 8;  key_len = 16; break;
1755         case 2: salt_len = 12; key_len = 24; break;
1756         case 3: salt_len = 16; key_len = 32; break;
1757         default: goto corrupted;
1758         }
1759         p = __archive_read_ahead(a, salt_len + 2, NULL);
1760         if (p == NULL)
1761                 goto truncated;
1762
1763         for (retry = 0;; retry++) {
1764                 const char *passphrase;
1765
1766                 passphrase = __archive_read_next_passphrase(a);
1767                 if (passphrase == NULL) {
1768                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1769                             (retry > 0)?
1770                                 "Incorrect passphrase":
1771                                 "Passphrase required for this entry");
1772                         return (ARCHIVE_FAILED);
1773                 }
1774                 memset(derived_key, 0, sizeof(derived_key));
1775                 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase),
1776                     p, salt_len, 1000, derived_key, key_len * 2 + 2);
1777                 if (r != 0) {
1778                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1779                             "Decryption is unsupported due to lack of "
1780                             "crypto library");
1781                         return (ARCHIVE_FAILED);
1782                 }
1783
1784                 /* Check password verification value. */
1785                 pv = ((const uint8_t *)p) + salt_len;
1786                 if (derived_key[key_len * 2] == pv[0] &&
1787                     derived_key[key_len * 2 + 1] == pv[1])
1788                         break;/* The passphrase is OK. */
1789                 if (retry > 10000) {
1790                         /* Avoid infinity loop. */
1791                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1792                             "Too many incorrect passphrases");
1793                         return (ARCHIVE_FAILED);
1794                 }
1795         }
1796
1797         r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len);
1798         if (r != 0) {
1799                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1800                     "Decryption is unsupported due to lack of crypto library");
1801                 return (ARCHIVE_FAILED);
1802         }
1803         r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len);
1804         if (r != 0) {
1805                 archive_decrypto_aes_ctr_release(&zip->cctx);
1806                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1807                     "Failed to initialize HMAC-SHA1");
1808                 return (ARCHIVE_FAILED);
1809         }
1810         zip->cctx_valid = zip->hctx_valid = 1;
1811         __archive_read_consume(a, salt_len + 2);
1812         zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE;
1813         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1814             && zip->entry_bytes_remaining < 0)
1815                 goto corrupted;
1816         zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE;
1817         zip->decrypted_bytes_remaining = 0;
1818
1819         zip->entry->compression = zip->entry->aes_extra.compression;
1820         return (zip_alloc_decryption_buffer(a));
1821
1822 truncated:
1823         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1824             "Truncated ZIP file data");
1825         return (ARCHIVE_FATAL);
1826 corrupted:
1827         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1828             "Corrupted ZIP file data");
1829         return (ARCHIVE_FATAL);
1830 }
1831
1832 static int
1833 archive_read_format_zip_read_data(struct archive_read *a,
1834     const void **buff, size_t *size, int64_t *offset)
1835 {
1836         int r;
1837         struct zip *zip = (struct zip *)(a->format->data);
1838
1839         if (zip->has_encrypted_entries ==
1840                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
1841                 zip->has_encrypted_entries = 0;
1842         }
1843
1844         *offset = zip->entry_uncompressed_bytes_read;
1845         *size = 0;
1846         *buff = NULL;
1847
1848         /* If we hit end-of-entry last time, return ARCHIVE_EOF. */
1849         if (zip->end_of_entry)
1850                 return (ARCHIVE_EOF);
1851
1852         /* Return EOF immediately if this is a non-regular file. */
1853         if (AE_IFREG != (zip->entry->mode & AE_IFMT))
1854                 return (ARCHIVE_EOF);
1855
1856         __archive_read_consume(a, zip->unconsumed);
1857         zip->unconsumed = 0;
1858
1859         if (zip->init_decryption) {
1860                 zip->has_encrypted_entries = 1;
1861                 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
1862                         r = read_decryption_header(a);
1863                 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
1864                         r = init_WinZip_AES_decryption(a);
1865                 else
1866                         r = init_traditional_PKWARE_decryption(a);
1867                 if (r != ARCHIVE_OK)
1868                         return (r);
1869                 zip->init_decryption = 0;
1870         }
1871
1872         switch(zip->entry->compression) {
1873         case 0:  /* No compression. */
1874                 r =  zip_read_data_none(a, buff, size, offset);
1875                 break;
1876 #ifdef HAVE_ZLIB_H
1877         case 8: /* Deflate compression. */
1878                 r =  zip_read_data_deflate(a, buff, size, offset);
1879                 break;
1880 #endif
1881         default: /* Unsupported compression. */
1882                 /* Return a warning. */
1883                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1884                     "Unsupported ZIP compression method (%s)",
1885                     compression_name(zip->entry->compression));
1886                 /* We can't decompress this entry, but we will
1887                  * be able to skip() it and try the next entry. */
1888                 return (ARCHIVE_FAILED);
1889                 break;
1890         }
1891         if (r != ARCHIVE_OK)
1892                 return (r);
1893         /* Update checksum */
1894         if (*size)
1895                 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff,
1896                     (unsigned)*size);
1897         /* If we hit the end, swallow any end-of-data marker. */
1898         if (zip->end_of_entry) {
1899                 /* Check file size, CRC against these values. */
1900                 if (zip->entry->compressed_size !=
1901                     zip->entry_compressed_bytes_read) {
1902                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1903                             "ZIP compressed data is wrong size "
1904                             "(read %jd, expected %jd)",
1905                             (intmax_t)zip->entry_compressed_bytes_read,
1906                             (intmax_t)zip->entry->compressed_size);
1907                         return (ARCHIVE_WARN);
1908                 }
1909                 /* Size field only stores the lower 32 bits of the actual
1910                  * size. */
1911                 if ((zip->entry->uncompressed_size & UINT32_MAX)
1912                     != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) {
1913                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1914                             "ZIP uncompressed data is wrong size "
1915                             "(read %jd, expected %jd)\n",
1916                             (intmax_t)zip->entry_uncompressed_bytes_read,
1917                             (intmax_t)zip->entry->uncompressed_size);
1918                         return (ARCHIVE_WARN);
1919                 }
1920                 /* Check computed CRC against header */
1921                 if ((!zip->hctx_valid ||
1922                       zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) &&
1923                    zip->entry->crc32 != zip->entry_crc32
1924                     && !zip->ignore_crc32) {
1925                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1926                             "ZIP bad CRC: 0x%lx should be 0x%lx",
1927                             (unsigned long)zip->entry_crc32,
1928                             (unsigned long)zip->entry->crc32);
1929                         return (ARCHIVE_WARN);
1930                 }
1931         }
1932
1933         return (ARCHIVE_OK);
1934 }
1935
1936 static int
1937 archive_read_format_zip_cleanup(struct archive_read *a)
1938 {
1939         struct zip *zip;
1940         struct zip_entry *zip_entry, *next_zip_entry;
1941
1942         zip = (struct zip *)(a->format->data);
1943 #ifdef HAVE_ZLIB_H
1944         if (zip->stream_valid)
1945                 inflateEnd(&zip->stream);
1946         free(zip->uncompressed_buffer);
1947 #endif
1948         if (zip->zip_entries) {
1949                 zip_entry = zip->zip_entries;
1950                 while (zip_entry != NULL) {
1951                         next_zip_entry = zip_entry->next;
1952                         archive_string_free(&zip_entry->rsrcname);
1953                         free(zip_entry);
1954                         zip_entry = next_zip_entry;
1955                 }
1956         }
1957         free(zip->decrypted_buffer);
1958         if (zip->cctx_valid)
1959                 archive_decrypto_aes_ctr_release(&zip->cctx);
1960         if (zip->hctx_valid)
1961                 archive_hmac_sha1_cleanup(&zip->hctx);
1962         free(zip->iv);
1963         free(zip->erd);
1964         free(zip->v_data);
1965         archive_string_free(&zip->format_name);
1966         free(zip);
1967         (a->format->data) = NULL;
1968         return (ARCHIVE_OK);
1969 }
1970
1971 static int
1972 archive_read_format_zip_has_encrypted_entries(struct archive_read *_a)
1973 {
1974         if (_a && _a->format) {
1975                 struct zip * zip = (struct zip *)_a->format->data;
1976                 if (zip) {
1977                         return zip->has_encrypted_entries;
1978                 }
1979         }
1980         return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
1981 }
1982
1983 static int
1984 archive_read_format_zip_options(struct archive_read *a,
1985     const char *key, const char *val)
1986 {
1987         struct zip *zip;
1988         int ret = ARCHIVE_FAILED;
1989
1990         zip = (struct zip *)(a->format->data);
1991         if (strcmp(key, "compat-2x")  == 0) {
1992                 /* Handle filenames as libarchive 2.x */
1993                 zip->init_default_conversion = (val != NULL) ? 1 : 0;
1994                 return (ARCHIVE_OK);
1995         } else if (strcmp(key, "hdrcharset")  == 0) {
1996                 if (val == NULL || val[0] == 0)
1997                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1998                             "zip: hdrcharset option needs a character-set name"
1999                         );
2000                 else {
2001                         zip->sconv = archive_string_conversion_from_charset(
2002                             &a->archive, val, 0);
2003                         if (zip->sconv != NULL) {
2004                                 if (strcmp(val, "UTF-8") == 0)
2005                                         zip->sconv_utf8 = zip->sconv;
2006                                 ret = ARCHIVE_OK;
2007                         } else
2008                                 ret = ARCHIVE_FATAL;
2009                 }
2010                 return (ret);
2011         } else if (strcmp(key, "ignorecrc32") == 0) {
2012                 /* Mostly useful for testing. */
2013                 if (val == NULL || val[0] == 0) {
2014                         zip->crc32func = real_crc32;
2015                         zip->ignore_crc32 = 0;
2016                 } else {
2017                         zip->crc32func = fake_crc32;
2018                         zip->ignore_crc32 = 1;
2019                 }
2020                 return (ARCHIVE_OK);
2021         } else if (strcmp(key, "mac-ext") == 0) {
2022                 zip->process_mac_extensions = (val != NULL && val[0] != 0);
2023                 return (ARCHIVE_OK);
2024         }
2025
2026         /* Note: The "warn" return is just to inform the options
2027          * supervisor that we didn't handle it.  It will generate
2028          * a suitable error if no one used this option. */
2029         return (ARCHIVE_WARN);
2030 }
2031
2032 int
2033 archive_read_support_format_zip(struct archive *a)
2034 {
2035         int r;
2036         r = archive_read_support_format_zip_streamable(a);
2037         if (r != ARCHIVE_OK)
2038                 return r;
2039         return (archive_read_support_format_zip_seekable(a));
2040 }
2041
2042 /* ------------------------------------------------------------------------ */
2043
2044 /*
2045  * Streaming-mode support
2046  */
2047
2048
2049 static int
2050 archive_read_support_format_zip_capabilities_streamable(struct archive_read * a)
2051 {
2052         (void)a; /* UNUSED */
2053         return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
2054                 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
2055 }
2056
2057 static int
2058 archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid)
2059 {
2060         const char *p;
2061
2062         (void)best_bid; /* UNUSED */
2063
2064         if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
2065                 return (-1);
2066
2067         /*
2068          * Bid of 29 here comes from:
2069          *  + 16 bits for "PK",
2070          *  + next 16-bit field has 6 options so contributes
2071          *    about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits
2072          *
2073          * So we've effectively verified ~29 total bits of check data.
2074          */
2075         if (p[0] == 'P' && p[1] == 'K') {
2076                 if ((p[2] == '\001' && p[3] == '\002')
2077                     || (p[2] == '\003' && p[3] == '\004')
2078                     || (p[2] == '\005' && p[3] == '\006')
2079                     || (p[2] == '\006' && p[3] == '\006')
2080                     || (p[2] == '\007' && p[3] == '\010')
2081                     || (p[2] == '0' && p[3] == '0'))
2082                         return (29);
2083         }
2084
2085         /* TODO: It's worth looking ahead a little bit for a valid
2086          * PK signature.  In particular, that would make it possible
2087          * to read some UUEncoded SFX files or SFX files coming from
2088          * a network socket. */
2089
2090         return (0);
2091 }
2092
2093 static int
2094 archive_read_format_zip_streamable_read_header(struct archive_read *a,
2095     struct archive_entry *entry)
2096 {
2097         struct zip *zip;
2098
2099         a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
2100         if (a->archive.archive_format_name == NULL)
2101                 a->archive.archive_format_name = "ZIP";
2102
2103         zip = (struct zip *)(a->format->data);
2104
2105         /*
2106          * It should be sufficient to call archive_read_next_header() for
2107          * a reader to determine if an entry is encrypted or not. If the
2108          * encryption of an entry is only detectable when calling
2109          * archive_read_data(), so be it. We'll do the same check there
2110          * as well.
2111          */
2112         if (zip->has_encrypted_entries ==
2113                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
2114                 zip->has_encrypted_entries = 0;
2115
2116         /* Make sure we have a zip_entry structure to use. */
2117         if (zip->zip_entries == NULL) {
2118                 zip->zip_entries = malloc(sizeof(struct zip_entry));
2119                 if (zip->zip_entries == NULL) {
2120                         archive_set_error(&a->archive, ENOMEM,
2121                             "Out  of memory");
2122                         return ARCHIVE_FATAL;
2123                 }
2124         }
2125         zip->entry = zip->zip_entries;
2126         memset(zip->entry, 0, sizeof(struct zip_entry));
2127
2128         if (zip->cctx_valid)
2129                 archive_decrypto_aes_ctr_release(&zip->cctx);
2130         if (zip->hctx_valid)
2131                 archive_hmac_sha1_cleanup(&zip->hctx);
2132         zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
2133         __archive_read_reset_passphrase(a);
2134
2135         /* Search ahead for the next local file header. */
2136         __archive_read_consume(a, zip->unconsumed);
2137         zip->unconsumed = 0;
2138         for (;;) {
2139                 int64_t skipped = 0;
2140                 const char *p, *end;
2141                 ssize_t bytes;
2142
2143                 p = __archive_read_ahead(a, 4, &bytes);
2144                 if (p == NULL)
2145                         return (ARCHIVE_FATAL);
2146                 end = p + bytes;
2147
2148                 while (p + 4 <= end) {
2149                         if (p[0] == 'P' && p[1] == 'K') {
2150                                 if (p[2] == '\003' && p[3] == '\004') {
2151                                         /* Regular file entry. */
2152                                         __archive_read_consume(a, skipped);
2153                                         return zip_read_local_file_header(a,
2154                                             entry, zip);
2155                                 }
2156
2157                               /*
2158                                * TODO: We cannot restore permissions
2159                                * based only on the local file headers.
2160                                * Consider scanning the central
2161                                * directory and returning additional
2162                                * entries for at least directories.
2163                                * This would allow us to properly set
2164                                * directory permissions.
2165                                *
2166                                * This won't help us fix symlinks
2167                                * and may not help with regular file
2168                                * permissions, either.  <sigh>
2169                                */
2170                               if (p[2] == '\001' && p[3] == '\002') {
2171                                       return (ARCHIVE_EOF);
2172                               }
2173
2174                               /* End of central directory?  Must be an
2175                                * empty archive. */
2176                               if ((p[2] == '\005' && p[3] == '\006')
2177                                   || (p[2] == '\006' && p[3] == '\006'))
2178                                       return (ARCHIVE_EOF);
2179                         }
2180                         ++p;
2181                         ++skipped;
2182                 }
2183                 __archive_read_consume(a, skipped);
2184         }
2185 }
2186
2187 static int
2188 archive_read_format_zip_read_data_skip_streamable(struct archive_read *a)
2189 {
2190         struct zip *zip;
2191         int64_t bytes_skipped;
2192
2193         zip = (struct zip *)(a->format->data);
2194         bytes_skipped = __archive_read_consume(a, zip->unconsumed);
2195         zip->unconsumed = 0;
2196         if (bytes_skipped < 0)
2197                 return (ARCHIVE_FATAL);
2198
2199         /* If we've already read to end of data, we're done. */
2200         if (zip->end_of_entry)
2201                 return (ARCHIVE_OK);
2202
2203         /* So we know we're streaming... */
2204         if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2205             || zip->entry->compressed_size > 0) {
2206                 /* We know the compressed length, so we can just skip. */
2207                 bytes_skipped = __archive_read_consume(a,
2208                                         zip->entry_bytes_remaining);
2209                 if (bytes_skipped < 0)
2210                         return (ARCHIVE_FATAL);
2211                 return (ARCHIVE_OK);
2212         }
2213
2214         if (zip->init_decryption) {
2215                 int r;
2216
2217                 zip->has_encrypted_entries = 1;
2218                 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
2219                         r = read_decryption_header(a);
2220                 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
2221                         r = init_WinZip_AES_decryption(a);
2222                 else
2223                         r = init_traditional_PKWARE_decryption(a);
2224                 if (r != ARCHIVE_OK)
2225                         return (r);
2226                 zip->init_decryption = 0;
2227         }
2228
2229         /* We're streaming and we don't know the length. */
2230         /* If the body is compressed and we know the format, we can
2231          * find an exact end-of-entry by decompressing it. */
2232         switch (zip->entry->compression) {
2233 #ifdef HAVE_ZLIB_H
2234         case 8: /* Deflate compression. */
2235                 while (!zip->end_of_entry) {
2236                         int64_t offset = 0;
2237                         const void *buff = NULL;
2238                         size_t size = 0;
2239                         int r;
2240                         r =  zip_read_data_deflate(a, &buff, &size, &offset);
2241                         if (r != ARCHIVE_OK)
2242                                 return (r);
2243                 }
2244                 return ARCHIVE_OK;
2245 #endif
2246         default: /* Uncompressed or unknown. */
2247                 /* Scan for a PK\007\010 signature. */
2248                 for (;;) {
2249                         const char *p, *buff;
2250                         ssize_t bytes_avail;
2251                         buff = __archive_read_ahead(a, 16, &bytes_avail);
2252                         if (bytes_avail < 16) {
2253                                 archive_set_error(&a->archive,
2254                                     ARCHIVE_ERRNO_FILE_FORMAT,
2255                                     "Truncated ZIP file data");
2256                                 return (ARCHIVE_FATAL);
2257                         }
2258                         p = buff;
2259                         while (p <= buff + bytes_avail - 16) {
2260                                 if (p[3] == 'P') { p += 3; }
2261                                 else if (p[3] == 'K') { p += 2; }
2262                                 else if (p[3] == '\007') { p += 1; }
2263                                 else if (p[3] == '\010' && p[2] == '\007'
2264                                     && p[1] == 'K' && p[0] == 'P') {
2265                                         if (zip->entry->flags & LA_USED_ZIP64)
2266                                                 __archive_read_consume(a,
2267                                                     p - buff + 24);
2268                                         else
2269                                                 __archive_read_consume(a,
2270                                                     p - buff + 16);
2271                                         return ARCHIVE_OK;
2272                                 } else { p += 4; }
2273                         }
2274                         __archive_read_consume(a, p - buff);
2275                 }
2276         }
2277 }
2278
2279 int
2280 archive_read_support_format_zip_streamable(struct archive *_a)
2281 {
2282         struct archive_read *a = (struct archive_read *)_a;
2283         struct zip *zip;
2284         int r;
2285
2286         archive_check_magic(_a, ARCHIVE_READ_MAGIC,
2287             ARCHIVE_STATE_NEW, "archive_read_support_format_zip");
2288
2289         zip = (struct zip *)calloc(1, sizeof(*zip));
2290         if (zip == NULL) {
2291                 archive_set_error(&a->archive, ENOMEM,
2292                     "Can't allocate zip data");
2293                 return (ARCHIVE_FATAL);
2294         }
2295
2296         /* Streamable reader doesn't support mac extensions. */
2297         zip->process_mac_extensions = 0;
2298
2299         /*
2300          * Until enough data has been read, we cannot tell about
2301          * any encrypted entries yet.
2302          */
2303         zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
2304         zip->crc32func = real_crc32;
2305
2306         r = __archive_read_register_format(a,
2307             zip,
2308             "zip",
2309             archive_read_format_zip_streamable_bid,
2310             archive_read_format_zip_options,
2311             archive_read_format_zip_streamable_read_header,
2312             archive_read_format_zip_read_data,
2313             archive_read_format_zip_read_data_skip_streamable,
2314             NULL,
2315             archive_read_format_zip_cleanup,
2316             archive_read_support_format_zip_capabilities_streamable,
2317             archive_read_format_zip_has_encrypted_entries);
2318
2319         if (r != ARCHIVE_OK)
2320                 free(zip);
2321         return (ARCHIVE_OK);
2322 }
2323
2324 /* ------------------------------------------------------------------------ */
2325
2326 /*
2327  * Seeking-mode support
2328  */
2329
2330 static int
2331 archive_read_support_format_zip_capabilities_seekable(struct archive_read * a)
2332 {
2333         (void)a; /* UNUSED */
2334         return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
2335                 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
2336 }
2337
2338 /*
2339  * TODO: This is a performance sink because it forces the read core to
2340  * drop buffered data from the start of file, which will then have to
2341  * be re-read again if this bidder loses.
2342  *
2343  * We workaround this a little by passing in the best bid so far so
2344  * that later bidders can do nothing if they know they'll never
2345  * outbid.  But we can certainly do better...
2346  */
2347 static int
2348 read_eocd(struct zip *zip, const char *p, int64_t current_offset)
2349 {
2350         /* Sanity-check the EOCD we've found. */
2351
2352         /* This must be the first volume. */
2353         if (archive_le16dec(p + 4) != 0)
2354                 return 0;
2355         /* Central directory must be on this volume. */
2356         if (archive_le16dec(p + 4) != archive_le16dec(p + 6))
2357                 return 0;
2358         /* All central directory entries must be on this volume. */
2359         if (archive_le16dec(p + 10) != archive_le16dec(p + 8))
2360                 return 0;
2361         /* Central directory can't extend beyond start of EOCD record. */
2362         if (archive_le32dec(p + 16) + archive_le32dec(p + 12)
2363             > current_offset)
2364                 return 0;
2365
2366         /* Save the central directory location for later use. */
2367         zip->central_directory_offset = archive_le32dec(p + 16);
2368
2369         /* This is just a tiny bit higher than the maximum
2370            returned by the streaming Zip bidder.  This ensures
2371            that the more accurate seeking Zip parser wins
2372            whenever seek is available. */
2373         return 32;
2374 }
2375
2376 /*
2377  * Examine Zip64 EOCD locator:  If it's valid, store the information
2378  * from it.
2379  */
2380 static void
2381 read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p)
2382 {
2383         int64_t eocd64_offset;
2384         int64_t eocd64_size;
2385
2386         /* Sanity-check the locator record. */
2387
2388         /* Central dir must be on first volume. */
2389         if (archive_le32dec(p + 4) != 0)
2390                 return;
2391         /* Must be only a single volume. */
2392         if (archive_le32dec(p + 16) != 1)
2393                 return;
2394
2395         /* Find the Zip64 EOCD record. */
2396         eocd64_offset = archive_le64dec(p + 8);
2397         if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0)
2398                 return;
2399         if ((p = __archive_read_ahead(a, 56, NULL)) == NULL)
2400                 return;
2401         /* Make sure we can read all of it. */
2402         eocd64_size = archive_le64dec(p + 4) + 12;
2403         if (eocd64_size < 56 || eocd64_size > 16384)
2404                 return;
2405         if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL)
2406                 return;
2407
2408         /* Sanity-check the EOCD64 */
2409         if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */
2410                 return;
2411         if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */
2412                 return;
2413         /* CD can't be split. */
2414         if (archive_le64dec(p + 24) != archive_le64dec(p + 32))
2415                 return;
2416
2417         /* Save the central directory offset for later use. */
2418         zip->central_directory_offset = archive_le64dec(p + 48);
2419 }
2420
2421 static int
2422 archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid)
2423 {
2424         struct zip *zip = (struct zip *)a->format->data;
2425         int64_t file_size, current_offset;
2426         const char *p;
2427         int i, tail;
2428
2429         /* If someone has already bid more than 32, then avoid
2430            trashing the look-ahead buffers with a seek. */
2431         if (best_bid > 32)
2432                 return (-1);
2433
2434         file_size = __archive_read_seek(a, 0, SEEK_END);
2435         if (file_size <= 0)
2436                 return 0;
2437
2438         /* Search last 16k of file for end-of-central-directory
2439          * record (which starts with PK\005\006) */
2440         tail = (int)zipmin(1024 * 16, file_size);
2441         current_offset = __archive_read_seek(a, -tail, SEEK_END);
2442         if (current_offset < 0)
2443                 return 0;
2444         if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL)
2445                 return 0;
2446         /* Boyer-Moore search backwards from the end, since we want
2447          * to match the last EOCD in the file (there can be more than
2448          * one if there is an uncompressed Zip archive as a member
2449          * within this Zip archive). */
2450         for (i = tail - 22; i > 0;) {
2451                 switch (p[i]) {
2452                 case 'P':
2453                         if (memcmp(p + i, "PK\005\006", 4) == 0) {
2454                                 int ret = read_eocd(zip, p + i,
2455                                     current_offset + i);
2456                                 if (ret > 0) {
2457                                         /* Zip64 EOCD locator precedes
2458                                          * regular EOCD if present. */
2459                                         if (i >= 20
2460                                             && memcmp(p + i - 20, "PK\006\007", 4) == 0) {
2461                                                 read_zip64_eocd(a, zip, p + i - 20);
2462                                         }
2463                                         return (ret);
2464                                 }
2465                         }
2466                         i -= 4;
2467                         break;
2468                 case 'K': i -= 1; break;
2469                 case 005: i -= 2; break;
2470                 case 006: i -= 3; break;
2471                 default: i -= 4; break;
2472                 }
2473         }
2474         return 0;
2475 }
2476
2477 /* The red-black trees are only used in seeking mode to manage
2478  * the in-memory copy of the central directory. */
2479
2480 static int
2481 cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2)
2482 {
2483         const struct zip_entry *e1 = (const struct zip_entry *)n1;
2484         const struct zip_entry *e2 = (const struct zip_entry *)n2;
2485
2486         if (e1->local_header_offset > e2->local_header_offset)
2487                 return -1;
2488         if (e1->local_header_offset < e2->local_header_offset)
2489                 return 1;
2490         return 0;
2491 }
2492
2493 static int
2494 cmp_key(const struct archive_rb_node *n, const void *key)
2495 {
2496         /* This function won't be called */
2497         (void)n; /* UNUSED */
2498         (void)key; /* UNUSED */
2499         return 1;
2500 }
2501
2502 static const struct archive_rb_tree_ops rb_ops = {
2503         &cmp_node, &cmp_key
2504 };
2505
2506 static int
2507 rsrc_cmp_node(const struct archive_rb_node *n1,
2508     const struct archive_rb_node *n2)
2509 {
2510         const struct zip_entry *e1 = (const struct zip_entry *)n1;
2511         const struct zip_entry *e2 = (const struct zip_entry *)n2;
2512
2513         return (strcmp(e2->rsrcname.s, e1->rsrcname.s));
2514 }
2515
2516 static int
2517 rsrc_cmp_key(const struct archive_rb_node *n, const void *key)
2518 {
2519         const struct zip_entry *e = (const struct zip_entry *)n;
2520         return (strcmp((const char *)key, e->rsrcname.s));
2521 }
2522
2523 static const struct archive_rb_tree_ops rb_rsrc_ops = {
2524         &rsrc_cmp_node, &rsrc_cmp_key
2525 };
2526
2527 static const char *
2528 rsrc_basename(const char *name, size_t name_length)
2529 {
2530         const char *s, *r;
2531
2532         r = s = name;
2533         for (;;) {
2534                 s = memchr(s, '/', name_length - (s - name));
2535                 if (s == NULL)
2536                         break;
2537                 r = ++s;
2538         }
2539         return (r);
2540 }
2541
2542 static void
2543 expose_parent_dirs(struct zip *zip, const char *name, size_t name_length)
2544 {
2545         struct archive_string str;
2546         struct zip_entry *dir;
2547         char *s;
2548
2549         archive_string_init(&str);
2550         archive_strncpy(&str, name, name_length);
2551         for (;;) {
2552                 s = strrchr(str.s, '/');
2553                 if (s == NULL)
2554                         break;
2555                 *s = '\0';
2556                 /* Transfer the parent directory from zip->tree_rsrc RB
2557                  * tree to zip->tree RB tree to expose. */
2558                 dir = (struct zip_entry *)
2559                     __archive_rb_tree_find_node(&zip->tree_rsrc, str.s);
2560                 if (dir == NULL)
2561                         break;
2562                 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node);
2563                 archive_string_free(&dir->rsrcname);
2564                 __archive_rb_tree_insert_node(&zip->tree, &dir->node);
2565         }
2566         archive_string_free(&str);
2567 }
2568
2569 static int
2570 slurp_central_directory(struct archive_read *a, struct zip *zip)
2571 {
2572         ssize_t i;
2573         unsigned found;
2574         int64_t correction;
2575         ssize_t bytes_avail;
2576         const char *p;
2577
2578         /*
2579          * Find the start of the central directory.  The end-of-CD
2580          * record has our starting point, but there are lots of
2581          * Zip archives which have had other data prepended to the
2582          * file, which makes the recorded offsets all too small.
2583          * So we search forward from the specified offset until we
2584          * find the real start of the central directory.  Then we
2585          * know the correction we need to apply to account for leading
2586          * padding.
2587          */
2588         if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0)
2589                 return ARCHIVE_FATAL;
2590
2591         found = 0;
2592         while (!found) {
2593                 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL)
2594                         return ARCHIVE_FATAL;
2595                 for (found = 0, i = 0; !found && i < bytes_avail - 4;) {
2596                         switch (p[i + 3]) {
2597                         case 'P': i += 3; break;
2598                         case 'K': i += 2; break;
2599                         case 001: i += 1; break;
2600                         case 002:
2601                                 if (memcmp(p + i, "PK\001\002", 4) == 0) {
2602                                         p += i;
2603                                         found = 1;
2604                                 } else
2605                                         i += 4;
2606                                 break;
2607                         case 005: i += 1; break;
2608                         case 006:
2609                                 if (memcmp(p + i, "PK\005\006", 4) == 0) {
2610                                         p += i;
2611                                         found = 1;
2612                                 } else if (memcmp(p + i, "PK\006\006", 4) == 0) {
2613                                         p += i;
2614                                         found = 1;
2615                                 } else
2616                                         i += 1;
2617                                 break;
2618                         default: i += 4; break;
2619                         }
2620                 }
2621                 __archive_read_consume(a, i);
2622         }
2623         correction = archive_filter_bytes(&a->archive, 0)
2624                         - zip->central_directory_offset;
2625
2626         __archive_rb_tree_init(&zip->tree, &rb_ops);
2627         __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops);
2628
2629         zip->central_directory_entries_total = 0;
2630         while (1) {
2631                 struct zip_entry *zip_entry;
2632                 size_t filename_length, extra_length, comment_length;
2633                 uint32_t external_attributes;
2634                 const char *name, *r;
2635
2636                 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
2637                         return ARCHIVE_FATAL;
2638                 if (memcmp(p, "PK\006\006", 4) == 0
2639                     || memcmp(p, "PK\005\006", 4) == 0) {
2640                         break;
2641                 } else if (memcmp(p, "PK\001\002", 4) != 0) {
2642                         archive_set_error(&a->archive,
2643                             -1, "Invalid central directory signature");
2644                         return ARCHIVE_FATAL;
2645                 }
2646                 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL)
2647                         return ARCHIVE_FATAL;
2648
2649                 zip_entry = calloc(1, sizeof(struct zip_entry));
2650                 zip_entry->next = zip->zip_entries;
2651                 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY;
2652                 zip->zip_entries = zip_entry;
2653                 zip->central_directory_entries_total++;
2654
2655                 /* version = p[4]; */
2656                 zip_entry->system = p[5];
2657                 /* version_required = archive_le16dec(p + 6); */
2658                 zip_entry->zip_flags = archive_le16dec(p + 8);
2659                 if (zip_entry->zip_flags
2660                       & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){
2661                         zip->has_encrypted_entries = 1;
2662                 }
2663                 zip_entry->compression = (char)archive_le16dec(p + 10);
2664                 zip_entry->mtime = zip_time(p + 12);
2665                 zip_entry->crc32 = archive_le32dec(p + 16);
2666                 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
2667                         zip_entry->decdat = p[13];
2668                 else
2669                         zip_entry->decdat = p[19];
2670                 zip_entry->compressed_size = archive_le32dec(p + 20);
2671                 zip_entry->uncompressed_size = archive_le32dec(p + 24);
2672                 filename_length = archive_le16dec(p + 28);
2673                 extra_length = archive_le16dec(p + 30);
2674                 comment_length = archive_le16dec(p + 32);
2675                 /* disk_start = archive_le16dec(p + 34); */ /* Better be zero. */
2676                 /* internal_attributes = archive_le16dec(p + 36); */ /* text bit */
2677                 external_attributes = archive_le32dec(p + 38);
2678                 zip_entry->local_header_offset =
2679                     archive_le32dec(p + 42) + correction;
2680
2681                 /* If we can't guess the mode, leave it zero here;
2682                    when we read the local file header we might get
2683                    more information. */
2684                 if (zip_entry->system == 3) {
2685                         zip_entry->mode = external_attributes >> 16;
2686                 } else if (zip_entry->system == 0) {
2687                         // Interpret MSDOS directory bit
2688                         if (0x10 == (external_attributes & 0x10)) {
2689                                 zip_entry->mode = AE_IFDIR | 0775;
2690                         } else {
2691                                 zip_entry->mode = AE_IFREG | 0664;
2692                         }
2693                         if (0x01 == (external_attributes & 0x01)) {
2694                                 // Read-only bit; strip write permissions
2695                                 zip_entry->mode &= 0555;
2696                         }
2697                 } else {
2698                         zip_entry->mode = 0;
2699                 }
2700
2701                 /* We're done with the regular data; get the filename and
2702                  * extra data. */
2703                 __archive_read_consume(a, 46);
2704                 p = __archive_read_ahead(a, filename_length + extra_length,
2705                         NULL);
2706                 if (p == NULL) {
2707                         archive_set_error(&a->archive,
2708                             ARCHIVE_ERRNO_FILE_FORMAT,
2709                             "Truncated ZIP file header");
2710                         return ARCHIVE_FATAL;
2711                 }
2712                 if (ARCHIVE_OK != process_extra(a, p + filename_length, extra_length, zip_entry)) {
2713                         return ARCHIVE_FATAL;
2714                 }
2715
2716                 /*
2717                  * Mac resource fork files are stored under the
2718                  * "__MACOSX/" directory, so we should check if
2719                  * it is.
2720                  */
2721                 if (!zip->process_mac_extensions) {
2722                         /* Treat every entry as a regular entry. */
2723                         __archive_rb_tree_insert_node(&zip->tree,
2724                             &zip_entry->node);
2725                 } else {
2726                         name = p;
2727                         r = rsrc_basename(name, filename_length);
2728                         if (filename_length >= 9 &&
2729                             strncmp("__MACOSX/", name, 9) == 0) {
2730                                 /* If this file is not a resource fork nor
2731                                  * a directory. We should treat it as a non
2732                                  * resource fork file to expose it. */
2733                                 if (name[filename_length-1] != '/' &&
2734                                     (r - name < 3 || r[0] != '.' || r[1] != '_')) {
2735                                         __archive_rb_tree_insert_node(
2736                                             &zip->tree, &zip_entry->node);
2737                                         /* Expose its parent directories. */
2738                                         expose_parent_dirs(zip, name,
2739                                             filename_length);
2740                                 } else {
2741                                         /* This file is a resource fork file or
2742                                          * a directory. */
2743                                         archive_strncpy(&(zip_entry->rsrcname),
2744                                              name, filename_length);
2745                                         __archive_rb_tree_insert_node(
2746                                             &zip->tree_rsrc, &zip_entry->node);
2747                                 }
2748                         } else {
2749                                 /* Generate resource fork name to find its
2750                                  * resource file at zip->tree_rsrc. */
2751                                 archive_strcpy(&(zip_entry->rsrcname),
2752                                     "__MACOSX/");
2753                                 archive_strncat(&(zip_entry->rsrcname),
2754                                     name, r - name);
2755                                 archive_strcat(&(zip_entry->rsrcname), "._");
2756                                 archive_strncat(&(zip_entry->rsrcname),
2757                                     name + (r - name),
2758                                     filename_length - (r - name));
2759                                 /* Register an entry to RB tree to sort it by
2760                                  * file offset. */
2761                                 __archive_rb_tree_insert_node(&zip->tree,
2762                                     &zip_entry->node);
2763                         }
2764                 }
2765
2766                 /* Skip the comment too ... */
2767                 __archive_read_consume(a,
2768                     filename_length + extra_length + comment_length);
2769         }
2770
2771         return ARCHIVE_OK;
2772 }
2773
2774 static ssize_t
2775 zip_get_local_file_header_size(struct archive_read *a, size_t extra)
2776 {
2777         const char *p;
2778         ssize_t filename_length, extra_length;
2779
2780         if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) {
2781                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2782                     "Truncated ZIP file header");
2783                 return (ARCHIVE_WARN);
2784         }
2785         p += extra;
2786
2787         if (memcmp(p, "PK\003\004", 4) != 0) {
2788                 archive_set_error(&a->archive, -1, "Damaged Zip archive");
2789                 return ARCHIVE_WARN;
2790         }
2791         filename_length = archive_le16dec(p + 26);
2792         extra_length = archive_le16dec(p + 28);
2793
2794         return (30 + filename_length + extra_length);
2795 }
2796
2797 static int
2798 zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
2799     struct zip_entry *rsrc)
2800 {
2801         struct zip *zip = (struct zip *)a->format->data;
2802         unsigned char *metadata, *mp;
2803         int64_t offset = archive_filter_bytes(&a->archive, 0);
2804         size_t remaining_bytes, metadata_bytes;
2805         ssize_t hsize;
2806         int ret = ARCHIVE_OK, eof;
2807
2808         switch(rsrc->compression) {
2809         case 0:  /* No compression. */
2810                 if (rsrc->uncompressed_size != rsrc->compressed_size) {
2811                         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2812                             "Malformed OS X metadata entry: inconsistent size");
2813                         return (ARCHIVE_FATAL);
2814                 }
2815 #ifdef HAVE_ZLIB_H
2816         case 8: /* Deflate compression. */
2817 #endif
2818                 break;
2819         default: /* Unsupported compression. */
2820                 /* Return a warning. */
2821                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2822                     "Unsupported ZIP compression method (%s)",
2823                     compression_name(rsrc->compression));
2824                 /* We can't decompress this entry, but we will
2825                  * be able to skip() it and try the next entry. */
2826                 return (ARCHIVE_WARN);
2827         }
2828
2829         if (rsrc->uncompressed_size > (4 * 1024 * 1024)) {
2830                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2831                     "Mac metadata is too large: %jd > 4M bytes",
2832                     (intmax_t)rsrc->uncompressed_size);
2833                 return (ARCHIVE_WARN);
2834         }
2835         if (rsrc->compressed_size > (4 * 1024 * 1024)) {
2836                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2837                     "Mac metadata is too large: %jd > 4M bytes",
2838                     (intmax_t)rsrc->compressed_size);
2839                 return (ARCHIVE_WARN);
2840         }
2841
2842         metadata = malloc((size_t)rsrc->uncompressed_size);
2843         if (metadata == NULL) {
2844                 archive_set_error(&a->archive, ENOMEM,
2845                     "Can't allocate memory for Mac metadata");
2846                 return (ARCHIVE_FATAL);
2847         }
2848
2849         if (offset < rsrc->local_header_offset)
2850                 __archive_read_consume(a, rsrc->local_header_offset - offset);
2851         else if (offset != rsrc->local_header_offset) {
2852                 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET);
2853         }
2854
2855         hsize = zip_get_local_file_header_size(a, 0);
2856         __archive_read_consume(a, hsize);
2857
2858         remaining_bytes = (size_t)rsrc->compressed_size;
2859         metadata_bytes = (size_t)rsrc->uncompressed_size;
2860         mp = metadata;
2861         eof = 0;
2862         while (!eof && remaining_bytes) {
2863                 const unsigned char *p;
2864                 ssize_t bytes_avail;
2865                 size_t bytes_used;
2866
2867                 p = __archive_read_ahead(a, 1, &bytes_avail);
2868                 if (p == NULL) {
2869                         archive_set_error(&a->archive,
2870                             ARCHIVE_ERRNO_FILE_FORMAT,
2871                             "Truncated ZIP file header");
2872                         ret = ARCHIVE_WARN;
2873                         goto exit_mac_metadata;
2874                 }
2875                 if ((size_t)bytes_avail > remaining_bytes)
2876                         bytes_avail = remaining_bytes;
2877                 switch(rsrc->compression) {
2878                 case 0:  /* No compression. */
2879                         if ((size_t)bytes_avail > metadata_bytes)
2880                                 bytes_avail = metadata_bytes;
2881                         memcpy(mp, p, bytes_avail);
2882                         bytes_used = (size_t)bytes_avail;
2883                         metadata_bytes -= bytes_used;
2884                         mp += bytes_used;
2885                         if (metadata_bytes == 0)
2886                                 eof = 1;
2887                         break;
2888 #ifdef HAVE_ZLIB_H
2889                 case 8: /* Deflate compression. */
2890                 {
2891                         int r;
2892
2893                         ret = zip_deflate_init(a, zip);
2894                         if (ret != ARCHIVE_OK)
2895                                 goto exit_mac_metadata;
2896                         zip->stream.next_in =
2897                             (Bytef *)(uintptr_t)(const void *)p;
2898                         zip->stream.avail_in = (uInt)bytes_avail;
2899                         zip->stream.total_in = 0;
2900                         zip->stream.next_out = mp;
2901                         zip->stream.avail_out = (uInt)metadata_bytes;
2902                         zip->stream.total_out = 0;
2903
2904                         r = inflate(&zip->stream, 0);
2905                         switch (r) {
2906                         case Z_OK:
2907                                 break;
2908                         case Z_STREAM_END:
2909                                 eof = 1;
2910                                 break;
2911                         case Z_MEM_ERROR:
2912                                 archive_set_error(&a->archive, ENOMEM,
2913                                     "Out of memory for ZIP decompression");
2914                                 ret = ARCHIVE_FATAL;
2915                                 goto exit_mac_metadata;
2916                         default:
2917                                 archive_set_error(&a->archive,
2918                                     ARCHIVE_ERRNO_MISC,
2919                                     "ZIP decompression failed (%d)", r);
2920                                 ret = ARCHIVE_FATAL;
2921                                 goto exit_mac_metadata;
2922                         }
2923                         bytes_used = zip->stream.total_in;
2924                         metadata_bytes -= zip->stream.total_out;
2925                         mp += zip->stream.total_out;
2926                         break;
2927                 }
2928 #endif
2929                 default:
2930                         bytes_used = 0;
2931                         break;
2932                 }
2933                 __archive_read_consume(a, bytes_used);
2934                 remaining_bytes -= bytes_used;
2935         }
2936         archive_entry_copy_mac_metadata(entry, metadata,
2937             (size_t)rsrc->uncompressed_size - metadata_bytes);
2938
2939 exit_mac_metadata:
2940         __archive_read_seek(a, offset, SEEK_SET);
2941         zip->decompress_init = 0;
2942         free(metadata);
2943         return (ret);
2944 }
2945
2946 static int
2947 archive_read_format_zip_seekable_read_header(struct archive_read *a,
2948         struct archive_entry *entry)
2949 {
2950         struct zip *zip = (struct zip *)a->format->data;
2951         struct zip_entry *rsrc;
2952         int64_t offset;
2953         int r, ret = ARCHIVE_OK;
2954
2955         /*
2956          * It should be sufficient to call archive_read_next_header() for
2957          * a reader to determine if an entry is encrypted or not. If the
2958          * encryption of an entry is only detectable when calling
2959          * archive_read_data(), so be it. We'll do the same check there
2960          * as well.
2961          */
2962         if (zip->has_encrypted_entries ==
2963                         ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
2964                 zip->has_encrypted_entries = 0;
2965
2966         a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
2967         if (a->archive.archive_format_name == NULL)
2968                 a->archive.archive_format_name = "ZIP";
2969
2970         if (zip->zip_entries == NULL) {
2971                 r = slurp_central_directory(a, zip);
2972                 if (r != ARCHIVE_OK)
2973                         return r;
2974                 /* Get first entry whose local header offset is lower than
2975                  * other entries in the archive file. */
2976                 zip->entry =
2977                     (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree);
2978         } else if (zip->entry != NULL) {
2979                 /* Get next entry in local header offset order. */
2980                 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate(
2981                     &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT);
2982         }
2983
2984         if (zip->entry == NULL)
2985                 return ARCHIVE_EOF;
2986
2987         if (zip->entry->rsrcname.s)
2988                 rsrc = (struct zip_entry *)__archive_rb_tree_find_node(
2989                     &zip->tree_rsrc, zip->entry->rsrcname.s);
2990         else
2991                 rsrc = NULL;
2992
2993         if (zip->cctx_valid)
2994                 archive_decrypto_aes_ctr_release(&zip->cctx);
2995         if (zip->hctx_valid)
2996                 archive_hmac_sha1_cleanup(&zip->hctx);
2997         zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
2998         __archive_read_reset_passphrase(a);
2999
3000         /* File entries are sorted by the header offset, we should mostly
3001          * use __archive_read_consume to advance a read point to avoid redundant
3002          * data reading.  */
3003         offset = archive_filter_bytes(&a->archive, 0);
3004         if (offset < zip->entry->local_header_offset)
3005                 __archive_read_consume(a,
3006                     zip->entry->local_header_offset - offset);
3007         else if (offset != zip->entry->local_header_offset) {
3008                 __archive_read_seek(a, zip->entry->local_header_offset,
3009                     SEEK_SET);
3010         }
3011         zip->unconsumed = 0;
3012         r = zip_read_local_file_header(a, entry, zip);
3013         if (r != ARCHIVE_OK)
3014                 return r;
3015         if (rsrc) {
3016                 int ret2 = zip_read_mac_metadata(a, entry, rsrc);
3017                 if (ret2 < ret)
3018                         ret = ret2;
3019         }
3020         return (ret);
3021 }
3022
3023 /*
3024  * We're going to seek for the next header anyway, so we don't
3025  * need to bother doing anything here.
3026  */
3027 static int
3028 archive_read_format_zip_read_data_skip_seekable(struct archive_read *a)
3029 {
3030         struct zip *zip;
3031         zip = (struct zip *)(a->format->data);
3032
3033         zip->unconsumed = 0;
3034         return (ARCHIVE_OK);
3035 }
3036
3037 int
3038 archive_read_support_format_zip_seekable(struct archive *_a)
3039 {
3040         struct archive_read *a = (struct archive_read *)_a;
3041         struct zip *zip;
3042         int r;
3043
3044         archive_check_magic(_a, ARCHIVE_READ_MAGIC,
3045             ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable");
3046
3047         zip = (struct zip *)calloc(1, sizeof(*zip));
3048         if (zip == NULL) {
3049                 archive_set_error(&a->archive, ENOMEM,
3050                     "Can't allocate zip data");
3051                 return (ARCHIVE_FATAL);
3052         }
3053
3054 #ifdef HAVE_COPYFILE_H
3055         /* Set this by default on Mac OS. */
3056         zip->process_mac_extensions = 1;
3057 #endif
3058
3059         /*
3060          * Until enough data has been read, we cannot tell about
3061          * any encrypted entries yet.
3062          */
3063         zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
3064         zip->crc32func = real_crc32;
3065
3066         r = __archive_read_register_format(a,
3067             zip,
3068             "zip",
3069             archive_read_format_zip_seekable_bid,
3070             archive_read_format_zip_options,
3071             archive_read_format_zip_seekable_read_header,
3072             archive_read_format_zip_read_data,
3073             archive_read_format_zip_read_data_skip_seekable,
3074             NULL,
3075             archive_read_format_zip_cleanup,
3076             archive_read_support_format_zip_capabilities_seekable,
3077             archive_read_format_zip_has_encrypted_entries);
3078
3079         if (r != ARCHIVE_OK)
3080                 free(zip);
3081         return (ARCHIVE_OK);
3082 }