contrib/libarchive/libarchive/archive_read_support_format_iso9660.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   3  * Copyright (c) 2009 Andreas Henriksson <andreas@fatal.se>
   4  * Copyright (c) 2009-2011 Michihiro NAKAJIMA
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "archive_platform.h"
  29 __FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_iso9660.c 201246 2009-12-30 05:30:35Z kientzle $");
  30
  31 #ifdef HAVE_ERRNO_H
  32 #include <errno.h>
  33 #endif
  34 /* #include <stdint.h> */ /* See archive_platform.h */
  35 #include <stdio.h>
  36 #ifdef HAVE_STDLIB_H
  37 #include <stdlib.h>
  38 #endif
  39 #ifdef HAVE_STRING_H
  40 #include <string.h>
  41 #endif
  42 #include <time.h>
  43 #ifdef HAVE_ZLIB_H
  44 #include <zlib.h>
  45 #endif
  46
  47 #include "archive.h"
  48 #include "archive_endian.h"
  49 #include "archive_entry.h"
  50 #include "archive_entry_locale.h"
  51 #include "archive_private.h"
  52 #include "archive_read_private.h"
  53 #include "archive_string.h"
  54
  55 /*
  56  * An overview of ISO 9660 format:
  57  *
  58  * Each disk is laid out as follows:
  59  *   * 32k reserved for private use
  60  *   * Volume descriptor table.  Each volume descriptor
  61  *     is 2k and specifies basic format information.
  62  *     The "Primary Volume Descriptor" (PVD) is defined by the
  63  *     standard and should always be present; other volume
  64  *     descriptors include various vendor-specific extensions.
  65  *   * Files and directories.  Each file/dir is specified by
  66  *     an "extent" (starting sector and length in bytes).
  67  *     Dirs are just files with directory records packed one
  68  *     after another.  The PVD contains a single dir entry
  69  *     specifying the location of the root directory.  Everything
  70  *     else follows from there.
  71  *
  72  * This module works by first reading the volume descriptors, then
  73  * building a list of directory entries, sorted by starting
  74  * sector.  At each step, I look for the earliest dir entry that
  75  * hasn't yet been read, seek forward to that location and read
  76  * that entry.  If it's a dir, I slurp in the new dir entries and
  77  * add them to the heap; if it's a regular file, I return the
  78  * corresponding archive_entry and wait for the client to request
  79  * the file body.  This strategy allows us to read most compliant
  80  * CDs with a single pass through the data, as required by libarchive.
  81  */
  82 #define LOGICAL_BLOCK_SIZE      2048
  83 #define SYSTEM_AREA_BLOCK       16
  84
  85 /* Structure of on-disk primary volume descriptor. */
  86 #define PVD_type_offset 0
  87 #define PVD_type_size 1
  88 #define PVD_id_offset (PVD_type_offset + PVD_type_size)
  89 #define PVD_id_size 5
  90 #define PVD_version_offset (PVD_id_offset + PVD_id_size)
  91 #define PVD_version_size 1
  92 #define PVD_reserved1_offset (PVD_version_offset + PVD_version_size)
  93 #define PVD_reserved1_size 1
  94 #define PVD_system_id_offset (PVD_reserved1_offset + PVD_reserved1_size)
  95 #define PVD_system_id_size 32
  96 #define PVD_volume_id_offset (PVD_system_id_offset + PVD_system_id_size)
  97 #define PVD_volume_id_size 32
  98 #define PVD_reserved2_offset (PVD_volume_id_offset + PVD_volume_id_size)
  99 #define PVD_reserved2_size 8
 100 #define PVD_volume_space_size_offset (PVD_reserved2_offset + PVD_reserved2_size)
 101 #define PVD_volume_space_size_size 8
 102 #define PVD_reserved3_offset (PVD_volume_space_size_offset + PVD_volume_space_size_size)
 103 #define PVD_reserved3_size 32
 104 #define PVD_volume_set_size_offset (PVD_reserved3_offset + PVD_reserved3_size)
 105 #define PVD_volume_set_size_size 4
 106 #define PVD_volume_sequence_number_offset (PVD_volume_set_size_offset + PVD_volume_set_size_size)
 107 #define PVD_volume_sequence_number_size 4
 108 #define PVD_logical_block_size_offset (PVD_volume_sequence_number_offset + PVD_volume_sequence_number_size)
 109 #define PVD_logical_block_size_size 4
 110 #define PVD_path_table_size_offset (PVD_logical_block_size_offset + PVD_logical_block_size_size)
 111 #define PVD_path_table_size_size 8
 112 #define PVD_type_1_path_table_offset (PVD_path_table_size_offset + PVD_path_table_size_size)
 113 #define PVD_type_1_path_table_size 4
 114 #define PVD_opt_type_1_path_table_offset (PVD_type_1_path_table_offset + PVD_type_1_path_table_size)
 115 #define PVD_opt_type_1_path_table_size 4
 116 #define PVD_type_m_path_table_offset (PVD_opt_type_1_path_table_offset + PVD_opt_type_1_path_table_size)
 117 #define PVD_type_m_path_table_size 4
 118 #define PVD_opt_type_m_path_table_offset (PVD_type_m_path_table_offset + PVD_type_m_path_table_size)
 119 #define PVD_opt_type_m_path_table_size 4
 120 #define PVD_root_directory_record_offset (PVD_opt_type_m_path_table_offset + PVD_opt_type_m_path_table_size)
 121 #define PVD_root_directory_record_size 34
 122 #define PVD_volume_set_id_offset (PVD_root_directory_record_offset + PVD_root_directory_record_size)
 123 #define PVD_volume_set_id_size 128
 124 #define PVD_publisher_id_offset (PVD_volume_set_id_offset + PVD_volume_set_id_size)
 125 #define PVD_publisher_id_size 128
 126 #define PVD_preparer_id_offset (PVD_publisher_id_offset + PVD_publisher_id_size)
 127 #define PVD_preparer_id_size 128
 128 #define PVD_application_id_offset (PVD_preparer_id_offset + PVD_preparer_id_size)
 129 #define PVD_application_id_size 128
 130 #define PVD_copyright_file_id_offset (PVD_application_id_offset + PVD_application_id_size)
 131 #define PVD_copyright_file_id_size 37
 132 #define PVD_abstract_file_id_offset (PVD_copyright_file_id_offset + PVD_copyright_file_id_size)
 133 #define PVD_abstract_file_id_size 37
 134 #define PVD_bibliographic_file_id_offset (PVD_abstract_file_id_offset + PVD_abstract_file_id_size)
 135 #define PVD_bibliographic_file_id_size 37
 136 #define PVD_creation_date_offset (PVD_bibliographic_file_id_offset + PVD_bibliographic_file_id_size)
 137 #define PVD_creation_date_size 17
 138 #define PVD_modification_date_offset (PVD_creation_date_offset + PVD_creation_date_size)
 139 #define PVD_modification_date_size 17
 140 #define PVD_expiration_date_offset (PVD_modification_date_offset + PVD_modification_date_size)
 141 #define PVD_expiration_date_size 17
 142 #define PVD_effective_date_offset (PVD_expiration_date_offset + PVD_expiration_date_size)
 143 #define PVD_effective_date_size 17
 144 #define PVD_file_structure_version_offset (PVD_effective_date_offset + PVD_effective_date_size)
 145 #define PVD_file_structure_version_size 1
 146 #define PVD_reserved4_offset (PVD_file_structure_version_offset + PVD_file_structure_version_size)
 147 #define PVD_reserved4_size 1
 148 #define PVD_application_data_offset (PVD_reserved4_offset + PVD_reserved4_size)
 149 #define PVD_application_data_size 512
 150 #define PVD_reserved5_offset (PVD_application_data_offset + PVD_application_data_size)
 151 #define PVD_reserved5_size (2048 - PVD_reserved5_offset)
 152
 153 /* TODO: It would make future maintenance easier to just hardcode the
 154  * above values.  In particular, ECMA119 states the offsets as part of
 155  * the standard.  That would eliminate the need for the following check.*/
 156 #if PVD_reserved5_offset != 1395
 157 #error PVD offset and size definitions are wrong.
 158 #endif
 159
 160
 161 /* Structure of optional on-disk supplementary volume descriptor. */
 162 #define SVD_type_offset 0
 163 #define SVD_type_size 1
 164 #define SVD_id_offset (SVD_type_offset + SVD_type_size)
 165 #define SVD_id_size 5
 166 #define SVD_version_offset (SVD_id_offset + SVD_id_size)
 167 #define SVD_version_size 1
 168 /* ... */
 169 #define SVD_reserved1_offset    72
 170 #define SVD_reserved1_size      8
 171 #define SVD_volume_space_size_offset 80
 172 #define SVD_volume_space_size_size 8
 173 #define SVD_escape_sequences_offset (SVD_volume_space_size_offset + SVD_volume_space_size_size)
 174 #define SVD_escape_sequences_size 32
 175 /* ... */
 176 #define SVD_logical_block_size_offset 128
 177 #define SVD_logical_block_size_size 4
 178 #define SVD_type_L_path_table_offset 140
 179 #define SVD_type_M_path_table_offset 148
 180 /* ... */
 181 #define SVD_root_directory_record_offset 156
 182 #define SVD_root_directory_record_size 34
 183 #define SVD_file_structure_version_offset 881
 184 #define SVD_reserved2_offset    882
 185 #define SVD_reserved2_size      1
 186 #define SVD_reserved3_offset    1395
 187 #define SVD_reserved3_size      653
 188 /* ... */
 189 /* FIXME: validate correctness of last SVD entry offset. */
 190
 191 /* Structure of an on-disk directory record. */
 192 /* Note:  ISO9660 stores each multi-byte integer twice, once in
 193  * each byte order.  The sizes here are the size of just one
 194  * of the two integers.  (This is why the offset of a field isn't
 195  * the same as the offset+size of the previous field.) */
 196 #define DR_length_offset 0
 197 #define DR_length_size 1
 198 #define DR_ext_attr_length_offset 1
 199 #define DR_ext_attr_length_size 1
 200 #define DR_extent_offset 2
 201 #define DR_extent_size 4
 202 #define DR_size_offset 10
 203 #define DR_size_size 4
 204 #define DR_date_offset 18
 205 #define DR_date_size 7
 206 #define DR_flags_offset 25
 207 #define DR_flags_size 1
 208 #define DR_file_unit_size_offset 26
 209 #define DR_file_unit_size_size 1
 210 #define DR_interleave_offset 27
 211 #define DR_interleave_size 1
 212 #define DR_volume_sequence_number_offset 28
 213 #define DR_volume_sequence_number_size 2
 214 #define DR_name_len_offset 32
 215 #define DR_name_len_size 1
 216 #define DR_name_offset 33
 217
 218 #ifdef HAVE_ZLIB_H
 219 static const unsigned char zisofs_magic[8] = {
 220         0x37, 0xE4, 0x53, 0x96, 0xC9, 0xDB, 0xD6, 0x07
 221 };
 222
 223 struct zisofs {
 224         /* Set 1 if this file compressed by paged zlib */
 225         int              pz;
 226         int              pz_log2_bs; /* Log2 of block size */
 227         uint64_t         pz_uncompressed_size;
 228
 229         int              initialized;
 230         unsigned char   *uncompressed_buffer;
 231         size_t           uncompressed_buffer_size;
 232
 233         uint32_t         pz_offset;
 234         unsigned char    header[16];
 235         size_t           header_avail;
 236         int              header_passed;
 237         unsigned char   *block_pointers;
 238         size_t           block_pointers_alloc;
 239         size_t           block_pointers_size;
 240         size_t           block_pointers_avail;
 241         size_t           block_off;
 242         uint32_t         block_avail;
 243
 244         z_stream         stream;
 245         int              stream_valid;
 246 };
 247 #else
 248 struct zisofs {
 249         /* Set 1 if this file compressed by paged zlib */
 250         int              pz;
 251 };
 252 #endif
 253
 254 struct content {
 255         uint64_t         offset;/* Offset on disk.              */
 256         uint64_t         size;  /* File size in bytes.          */
 257         struct content  *next;
 258 };
 259
 260 /* In-memory storage for a directory record. */
 261 struct file_info {
 262         struct file_info        *use_next;
 263         struct file_info        *parent;
 264         struct file_info        *next;
 265         struct file_info        *re_next;
 266         int              subdirs;
 267         uint64_t         key;           /* Heap Key.                    */
 268         uint64_t         offset;        /* Offset on disk.              */
 269         uint64_t         size;          /* File size in bytes.          */
 270         uint32_t         ce_offset;     /* Offset of CE.                */
 271         uint32_t         ce_size;       /* Size of CE.                  */
 272         char             rr_moved;      /* Flag to rr_moved.            */
 273         char             rr_moved_has_re_only;
 274         char             re;            /* Having RRIP "RE" extension.  */
 275         char             re_descendant;
 276         uint64_t         cl_offset;     /* Having RRIP "CL" extension.  */
 277         int              birthtime_is_set;
 278         time_t           birthtime;     /* File created time.           */
 279         time_t           mtime;         /* File last modified time.     */
 280         time_t           atime;         /* File last accessed time.     */
 281         time_t           ctime;         /* File attribute change time.  */
 282         uint64_t         rdev;          /* Device number.               */
 283         mode_t           mode;
 284         uid_t            uid;
 285         gid_t            gid;
 286         int64_t          number;
 287         int              nlinks;
 288         struct archive_string name; /* Pathname */
 289         unsigned char   *utf16be_name;
 290         size_t           utf16be_bytes;
 291         char             name_continues; /* Non-zero if name continues */
 292         struct archive_string symlink;
 293         char             symlink_continues; /* Non-zero if link continues */
 294         /* Set 1 if this file compressed by paged zlib(zisofs) */
 295         int              pz;
 296         int              pz_log2_bs; /* Log2 of block size */
 297         uint64_t         pz_uncompressed_size;
 298         /* Set 1 if this file is multi extent. */
 299         int              multi_extent;
 300         struct {
 301                 struct content  *first;
 302                 struct content  **last;
 303         } contents;
 304         struct {
 305                 struct file_info        *first;
 306                 struct file_info        **last;
 307         } rede_files;
 308 };
 309
 310 struct heap_queue {
 311         struct file_info **files;
 312         int              allocated;
 313         int              used;
 314 };
 315
 316 struct iso9660 {
 317         int     magic;
 318 #define ISO9660_MAGIC   0x96609660
 319
 320         int opt_support_joliet;
 321         int opt_support_rockridge;
 322
 323         struct archive_string pathname;
 324         char    seenRockridge;  /* Set true if RR extensions are used. */
 325         char    seenSUSP;       /* Set true if SUSP is beging used. */
 326         char    seenJoliet;
 327
 328         unsigned char   suspOffset;
 329         struct file_info *rr_moved;
 330         struct read_ce_queue {
 331                 struct read_ce_req {
 332                         uint64_t         offset;/* Offset of CE on disk. */
 333                         struct file_info *file;
 334                 }               *reqs;
 335                 int              cnt;
 336                 int              allocated;
 337         }       read_ce_req;
 338
 339         int64_t         previous_number;
 340         struct archive_string previous_pathname;
 341
 342         struct file_info                *use_files;
 343         struct heap_queue                pending_files;
 344         struct {
 345                 struct file_info        *first;
 346                 struct file_info        **last;
 347         }       cache_files;
 348         struct {
 349                 struct file_info        *first;
 350                 struct file_info        **last;
 351         }       re_files;
 352
 353         uint64_t current_position;
 354         ssize_t logical_block_size;
 355         uint64_t volume_size; /* Total size of volume in bytes. */
 356         int32_t  volume_block;/* Total size of volume in logical blocks. */
 357
 358         struct vd {
 359                 int             location;       /* Location of Extent.  */
 360                 uint32_t        size;
 361         } primary, joliet;
 362
 363         int64_t entry_sparse_offset;
 364         int64_t entry_bytes_remaining;
 365         size_t  entry_bytes_unconsumed;
 366         struct zisofs    entry_zisofs;
 367         struct content  *entry_content;
 368         struct archive_string_conv *sconv_utf16be;
 369         /*
 370          * Buffers for a full pathname in UTF-16BE in Joliet extensions.
 371          */
 372 #define UTF16_NAME_MAX  1024
 373         unsigned char *utf16be_path;
 374         size_t           utf16be_path_len;
 375         unsigned char *utf16be_previous_path;
 376         size_t           utf16be_previous_path_len;
 377 };
 378
 379 static int      archive_read_format_iso9660_bid(struct archive_read *, int);
 380 static int      archive_read_format_iso9660_options(struct archive_read *,
 381                     const char *, const char *);
 382 static int      archive_read_format_iso9660_cleanup(struct archive_read *);
 383 static int      archive_read_format_iso9660_read_data(struct archive_read *,
 384                     const void **, size_t *, int64_t *);
 385 static int      archive_read_format_iso9660_read_data_skip(struct archive_read *);
 386 static int      archive_read_format_iso9660_read_header(struct archive_read *,
 387                     struct archive_entry *);
 388 static const char *build_pathname(struct archive_string *, struct file_info *);
 389 static int      build_pathname_utf16be(unsigned char *, size_t, size_t *,
 390                     struct file_info *);
 391 #if DEBUG
 392 static void     dump_isodirrec(FILE *, const unsigned char *isodirrec);
 393 #endif
 394 static time_t   time_from_tm(struct tm *);
 395 static time_t   isodate17(const unsigned char *);
 396 static time_t   isodate7(const unsigned char *);
 397 static int      isBootRecord(struct iso9660 *, const unsigned char *);
 398 static int      isVolumePartition(struct iso9660 *, const unsigned char *);
 399 static int      isVDSetTerminator(struct iso9660 *, const unsigned char *);
 400 static int      isJolietSVD(struct iso9660 *, const unsigned char *);
 401 static int      isSVD(struct iso9660 *, const unsigned char *);
 402 static int      isEVD(struct iso9660 *, const unsigned char *);
 403 static int      isPVD(struct iso9660 *, const unsigned char *);
 404 static int      next_cache_entry(struct archive_read *, struct iso9660 *,
 405                     struct file_info **);
 406 static int      next_entry_seek(struct archive_read *, struct iso9660 *,
 407                     struct file_info **);
 408 static struct file_info *
 409                 parse_file_info(struct archive_read *a,
 410                     struct file_info *parent, const unsigned char *isodirrec);
 411 static int      parse_rockridge(struct archive_read *a,
 412                     struct file_info *file, const unsigned char *start,
 413                     const unsigned char *end);
 414 static int      register_CE(struct archive_read *a, int32_t location,
 415                     struct file_info *file);
 416 static int      read_CE(struct archive_read *a, struct iso9660 *iso9660);
 417 static void     parse_rockridge_NM1(struct file_info *,
 418                     const unsigned char *, int);
 419 static void     parse_rockridge_SL1(struct file_info *,
 420                     const unsigned char *, int);
 421 static void     parse_rockridge_TF1(struct file_info *,
 422                     const unsigned char *, int);
 423 static void     parse_rockridge_ZF1(struct file_info *,
 424                     const unsigned char *, int);
 425 static void     register_file(struct iso9660 *, struct file_info *);
 426 static void     release_files(struct iso9660 *);
 427 static unsigned toi(const void *p, int n);
 428 static inline void re_add_entry(struct iso9660 *, struct file_info *);
 429 static inline struct file_info * re_get_entry(struct iso9660 *);
 430 static inline int rede_add_entry(struct file_info *);
 431 static inline struct file_info * rede_get_entry(struct file_info *);
 432 static inline void cache_add_entry(struct iso9660 *iso9660,
 433                     struct file_info *file);
 434 static inline struct file_info *cache_get_entry(struct iso9660 *iso9660);
 435 static int      heap_add_entry(struct archive_read *a, struct heap_queue *heap,
 436                     struct file_info *file, uint64_t key);
 437 static struct file_info *heap_get_entry(struct heap_queue *heap);
 438
 439 #define add_entry(arch, iso9660, file)  \
 440         heap_add_entry(arch, &((iso9660)->pending_files), file, file->offset)
 441 #define next_entry(iso9660)             \
 442         heap_get_entry(&((iso9660)->pending_files))
 443
 444 int
 445 archive_read_support_format_iso9660(struct archive *_a)
 446 {
 447         struct archive_read *a = (struct archive_read *)_a;
 448         struct iso9660 *iso9660;
 449         int r;
 450
 451         archive_check_magic(_a, ARCHIVE_READ_MAGIC,
 452             ARCHIVE_STATE_NEW, "archive_read_support_format_iso9660");
 453
 454         iso9660 = (struct iso9660 *)calloc(1, sizeof(*iso9660));
 455         if (iso9660 == NULL) {
 456                 archive_set_error(&a->archive, ENOMEM,
 457                     "Can't allocate iso9660 data");
 458                 return (ARCHIVE_FATAL);
 459         }
 460         iso9660->magic = ISO9660_MAGIC;
 461         iso9660->cache_files.first = NULL;
 462         iso9660->cache_files.last = &(iso9660->cache_files.first);
 463         iso9660->re_files.first = NULL;
 464         iso9660->re_files.last = &(iso9660->re_files.first);
 465         /* Enable to support Joliet extensions by default.      */
 466         iso9660->opt_support_joliet = 1;
 467         /* Enable to support Rock Ridge extensions by default.  */
 468         iso9660->opt_support_rockridge = 1;
 469
 470         r = __archive_read_register_format(a,
 471             iso9660,
 472             "iso9660",
 473             archive_read_format_iso9660_bid,
 474             archive_read_format_iso9660_options,
 475             archive_read_format_iso9660_read_header,
 476             archive_read_format_iso9660_read_data,
 477             archive_read_format_iso9660_read_data_skip,
 478             archive_read_format_iso9660_cleanup);
 479
 480         if (r != ARCHIVE_OK) {
 481                 free(iso9660);
 482                 return (r);
 483         }
 484         return (ARCHIVE_OK);
 485 }
 486
 487
 488 static int
 489 archive_read_format_iso9660_bid(struct archive_read *a, int best_bid)
 490 {
 491         struct iso9660 *iso9660;
 492         ssize_t bytes_read;
 493         const unsigned char *p;
 494         int seenTerminator;
 495
 496         /* If there's already a better bid than we can ever
 497            make, don't bother testing. */
 498         if (best_bid > 48)
 499                 return (-1);
 500
 501         iso9660 = (struct iso9660 *)(a->format->data);
 502
 503         /*
 504          * Skip the first 32k (reserved area) and get the first
 505          * 8 sectors of the volume descriptor table.  Of course,
 506          * if the I/O layer gives us more, we'll take it.
 507          */
 508 #define RESERVED_AREA   (SYSTEM_AREA_BLOCK * LOGICAL_BLOCK_SIZE)
 509         p = __archive_read_ahead(a,
 510             RESERVED_AREA + 8 * LOGICAL_BLOCK_SIZE,
 511             &bytes_read);
 512         if (p == NULL)
 513             return (-1);
 514
 515         /* Skip the reserved area. */
 516         bytes_read -= RESERVED_AREA;
 517         p += RESERVED_AREA;
 518
 519         /* Check each volume descriptor. */
 520         seenTerminator = 0;
 521         for (; bytes_read > LOGICAL_BLOCK_SIZE;
 522             bytes_read -= LOGICAL_BLOCK_SIZE, p += LOGICAL_BLOCK_SIZE) {
 523                 /* Do not handle undefined Volume Descriptor Type. */
 524                 if (p[0] >= 4 && p[0] <= 254)
 525                         return (0);
 526                 /* Standard Identifier must be "CD001" */
 527                 if (memcmp(p + 1, "CD001", 5) != 0)
 528                         return (0);
 529                 if (isPVD(iso9660, p))
 530                         continue;
 531                 if (!iso9660->joliet.location) {
 532                         if (isJolietSVD(iso9660, p))
 533                                 continue;
 534                 }
 535                 if (isBootRecord(iso9660, p))
 536                         continue;
 537                 if (isEVD(iso9660, p))
 538                         continue;
 539                 if (isSVD(iso9660, p))
 540                         continue;
 541                 if (isVolumePartition(iso9660, p))
 542                         continue;
 543                 if (isVDSetTerminator(iso9660, p)) {
 544                         seenTerminator = 1;
 545                         break;
 546                 }
 547                 return (0);
 548         }
 549         /*
 550          * ISO 9660 format must have Primary Volume Descriptor and
 551          * Volume Descriptor Set Terminator.
 552          */
 553         if (seenTerminator && iso9660->primary.location > 16)
 554                 return (48);
 555
 556         /* We didn't find a valid PVD; return a bid of zero. */
 557         return (0);
 558 }
 559
 560 static int
 561 archive_read_format_iso9660_options(struct archive_read *a,
 562                 const char *key, const char *val)
 563 {
 564         struct iso9660 *iso9660;
 565
 566         iso9660 = (struct iso9660 *)(a->format->data);
 567
 568         if (strcmp(key, "joliet") == 0) {
 569                 if (val == NULL || strcmp(val, "off") == 0 ||
 570                                 strcmp(val, "ignore") == 0 ||
 571                                 strcmp(val, "disable") == 0 ||
 572                                 strcmp(val, "0") == 0)
 573                         iso9660->opt_support_joliet = 0;
 574                 else
 575                         iso9660->opt_support_joliet = 1;
 576                 return (ARCHIVE_OK);
 577         }
 578         if (strcmp(key, "rockridge") == 0 ||
 579             strcmp(key, "Rockridge") == 0) {
 580                 iso9660->opt_support_rockridge = val != NULL;
 581                 return (ARCHIVE_OK);
 582         }
 583
 584         /* Note: The "warn" return is just to inform the options
 585          * supervisor that we didn't handle it.  It will generate
 586          * a suitable error if no one used this option. */
 587         return (ARCHIVE_WARN);
 588 }
 589
 590 static int
 591 isBootRecord(struct iso9660 *iso9660, const unsigned char *h)
 592 {
 593         (void)iso9660; /* UNUSED */
 594
 595         /* Type of the Volume Descriptor Boot Record must be 0. */
 596         if (h[0] != 0)
 597                 return (0);
 598
 599         /* Volume Descriptor Version must be 1. */
 600         if (h[6] != 1)
 601                 return (0);
 602
 603         return (1);
 604 }
 605
 606 static int
 607 isVolumePartition(struct iso9660 *iso9660, const unsigned char *h)
 608 {
 609         int32_t location;
 610
 611         /* Type of the Volume Partition Descriptor must be 3. */
 612         if (h[0] != 3)
 613                 return (0);
 614
 615         /* Volume Descriptor Version must be 1. */
 616         if (h[6] != 1)
 617                 return (0);
 618         /* Unused Field */
 619         if (h[7] != 0)
 620                 return (0);
 621
 622         location = archive_le32dec(h + 72);
 623         if (location <= SYSTEM_AREA_BLOCK ||
 624             location >= iso9660->volume_block)
 625                 return (0);
 626         if ((uint32_t)location != archive_be32dec(h + 76))
 627                 return (0);
 628
 629         return (1);
 630 }
 631
 632 static int
 633 isVDSetTerminator(struct iso9660 *iso9660, const unsigned char *h)
 634 {
 635         int i;
 636
 637         (void)iso9660; /* UNUSED */
 638
 639         /* Type of the Volume Descriptor Set Terminator must be 255. */
 640         if (h[0] != 255)
 641                 return (0);
 642
 643         /* Volume Descriptor Version must be 1. */
 644         if (h[6] != 1)
 645                 return (0);
 646
 647         /* Reserved field must be 0. */
 648         for (i = 7; i < 2048; ++i)
 649                 if (h[i] != 0)
 650                         return (0);
 651
 652         return (1);
 653 }
 654
 655 static int
 656 isJolietSVD(struct iso9660 *iso9660, const unsigned char *h)
 657 {
 658         const unsigned char *p;
 659         ssize_t logical_block_size;
 660         int32_t volume_block;
 661
 662         /* Check if current sector is a kind of Supplementary Volume
 663          * Descriptor. */
 664         if (!isSVD(iso9660, h))
 665                 return (0);
 666
 667         /* FIXME: do more validations according to joliet spec. */
 668
 669         /* check if this SVD contains joliet extension! */
 670         p = h + SVD_escape_sequences_offset;
 671         /* N.B. Joliet spec says p[1] == '\\', but.... */
 672         if (p[0] == '%' && p[1] == '/') {
 673                 int level = 0;
 674
 675                 if (p[2] == '@')
 676                         level = 1;
 677                 else if (p[2] == 'C')
 678                         level = 2;
 679                 else if (p[2] == 'E')
 680                         level = 3;
 681                 else /* not joliet */
 682                         return (0);
 683
 684                 iso9660->seenJoliet = level;
 685
 686         } else /* not joliet */
 687                 return (0);
 688
 689         logical_block_size =
 690             archive_le16dec(h + SVD_logical_block_size_offset);
 691         volume_block = archive_le32dec(h + SVD_volume_space_size_offset);
 692
 693         iso9660->logical_block_size = logical_block_size;
 694         iso9660->volume_block = volume_block;
 695         iso9660->volume_size = logical_block_size * (uint64_t)volume_block;
 696         /* Read Root Directory Record in Volume Descriptor. */
 697         p = h + SVD_root_directory_record_offset;
 698         iso9660->joliet.location = archive_le32dec(p + DR_extent_offset);
 699         iso9660->joliet.size = archive_le32dec(p + DR_size_offset);
 700
 701         return (48);
 702 }
 703
 704 static int
 705 isSVD(struct iso9660 *iso9660, const unsigned char *h)
 706 {
 707         const unsigned char *p;
 708         ssize_t logical_block_size;
 709         int32_t volume_block;
 710         int32_t location;
 711         int i;
 712
 713         (void)iso9660; /* UNUSED */
 714
 715         /* Type 2 means it's a SVD. */
 716         if (h[SVD_type_offset] != 2)
 717                 return (0);
 718
 719         /* Reserved field must be 0. */
 720         for (i = 0; i < SVD_reserved1_size; ++i)
 721                 if (h[SVD_reserved1_offset + i] != 0)
 722                         return (0);
 723         for (i = 0; i < SVD_reserved2_size; ++i)
 724                 if (h[SVD_reserved2_offset + i] != 0)
 725                         return (0);
 726         for (i = 0; i < SVD_reserved3_size; ++i)
 727                 if (h[SVD_reserved3_offset + i] != 0)
 728                         return (0);
 729
 730         /* File structure version must be 1 for ISO9660/ECMA119. */
 731         if (h[SVD_file_structure_version_offset] != 1)
 732                 return (0);
 733
 734         logical_block_size =
 735             archive_le16dec(h + SVD_logical_block_size_offset);
 736         if (logical_block_size <= 0)
 737                 return (0);
 738
 739         volume_block = archive_le32dec(h + SVD_volume_space_size_offset);
 740         if (volume_block <= SYSTEM_AREA_BLOCK+4)
 741                 return (0);
 742
 743         /* Location of Occurrence of Type L Path Table must be
 744          * available location,
 745          * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 746         location = archive_le32dec(h+SVD_type_L_path_table_offset);
 747         if (location < SYSTEM_AREA_BLOCK+2 || location >= volume_block)
 748                 return (0);
 749
 750         /* The Type M Path Table must be at a valid location (WinISO
 751          * and probably other programs omit this, so we allow zero)
 752          *
 753          * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 754         location = archive_be32dec(h+SVD_type_M_path_table_offset);
 755         if ((location > 0 && location < SYSTEM_AREA_BLOCK+2)
 756             || location >= volume_block)
 757                 return (0);
 758
 759         /* Read Root Directory Record in Volume Descriptor. */
 760         p = h + SVD_root_directory_record_offset;
 761         if (p[DR_length_offset] != 34)
 762                 return (0);
 763
 764         return (48);
 765 }
 766
 767 static int
 768 isEVD(struct iso9660 *iso9660, const unsigned char *h)
 769 {
 770         const unsigned char *p;
 771         ssize_t logical_block_size;
 772         int32_t volume_block;
 773         int32_t location;
 774         int i;
 775
 776         (void)iso9660; /* UNUSED */
 777
 778         /* Type of the Enhanced Volume Descriptor must be 2. */
 779         if (h[PVD_type_offset] != 2)
 780                 return (0);
 781
 782         /* EVD version must be 2. */
 783         if (h[PVD_version_offset] != 2)
 784                 return (0);
 785
 786         /* Reserved field must be 0. */
 787         if (h[PVD_reserved1_offset] != 0)
 788                 return (0);
 789
 790         /* Reserved field must be 0. */
 791         for (i = 0; i < PVD_reserved2_size; ++i)
 792                 if (h[PVD_reserved2_offset + i] != 0)
 793                         return (0);
 794
 795         /* Reserved field must be 0. */
 796         for (i = 0; i < PVD_reserved3_size; ++i)
 797                 if (h[PVD_reserved3_offset + i] != 0)
 798                         return (0);
 799
 800         /* Logical block size must be > 0. */
 801         /* I've looked at Ecma 119 and can't find any stronger
 802          * restriction on this field. */
 803         logical_block_size =
 804             archive_le16dec(h + PVD_logical_block_size_offset);
 805         if (logical_block_size <= 0)
 806                 return (0);
 807
 808         volume_block =
 809             archive_le32dec(h + PVD_volume_space_size_offset);
 810         if (volume_block <= SYSTEM_AREA_BLOCK+4)
 811                 return (0);
 812
 813         /* File structure version must be 2 for ISO9660:1999. */
 814         if (h[PVD_file_structure_version_offset] != 2)
 815                 return (0);
 816
 817         /* Location of Occurrence of Type L Path Table must be
 818          * available location,
 819          * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 820         location = archive_le32dec(h+PVD_type_1_path_table_offset);
 821         if (location < SYSTEM_AREA_BLOCK+2 || location >= volume_block)
 822                 return (0);
 823
 824         /* Location of Occurrence of Type M Path Table must be
 825          * available location,
 826          * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 827         location = archive_be32dec(h+PVD_type_m_path_table_offset);
 828         if ((location > 0 && location < SYSTEM_AREA_BLOCK+2)
 829             || location >= volume_block)
 830                 return (0);
 831
 832         /* Reserved field must be 0. */
 833         for (i = 0; i < PVD_reserved4_size; ++i)
 834                 if (h[PVD_reserved4_offset + i] != 0)
 835                         return (0);
 836
 837         /* Reserved field must be 0. */
 838         for (i = 0; i < PVD_reserved5_size; ++i)
 839                 if (h[PVD_reserved5_offset + i] != 0)
 840                         return (0);
 841
 842         /* Read Root Directory Record in Volume Descriptor. */
 843         p = h + PVD_root_directory_record_offset;
 844         if (p[DR_length_offset] != 34)
 845                 return (0);
 846
 847         return (48);
 848 }
 849
 850 static int
 851 isPVD(struct iso9660 *iso9660, const unsigned char *h)
 852 {
 853         const unsigned char *p;
 854         ssize_t logical_block_size;
 855         int32_t volume_block;
 856         int32_t location;
 857         int i;
 858
 859         /* Type of the Primary Volume Descriptor must be 1. */
 860         if (h[PVD_type_offset] != 1)
 861                 return (0);
 862
 863         /* PVD version must be 1. */
 864         if (h[PVD_version_offset] != 1)
 865                 return (0);
 866
 867         /* Reserved field must be 0. */
 868         if (h[PVD_reserved1_offset] != 0)
 869                 return (0);
 870
 871         /* Reserved field must be 0. */
 872         for (i = 0; i < PVD_reserved2_size; ++i)
 873                 if (h[PVD_reserved2_offset + i] != 0)
 874                         return (0);
 875
 876         /* Reserved field must be 0. */
 877         for (i = 0; i < PVD_reserved3_size; ++i)
 878                 if (h[PVD_reserved3_offset + i] != 0)
 879                         return (0);
 880
 881         /* Logical block size must be > 0. */
 882         /* I've looked at Ecma 119 and can't find any stronger
 883          * restriction on this field. */
 884         logical_block_size =
 885             archive_le16dec(h + PVD_logical_block_size_offset);
 886         if (logical_block_size <= 0)
 887                 return (0);
 888
 889         volume_block = archive_le32dec(h + PVD_volume_space_size_offset);
 890         if (volume_block <= SYSTEM_AREA_BLOCK+4)
 891                 return (0);
 892
 893         /* File structure version must be 1 for ISO9660/ECMA119. */
 894         if (h[PVD_file_structure_version_offset] != 1)
 895                 return (0);
 896
 897         /* Location of Occurrence of Type L Path Table must be
 898          * available location,
 899          * > SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 900         location = archive_le32dec(h+PVD_type_1_path_table_offset);
 901         if (location < SYSTEM_AREA_BLOCK+2 || location >= volume_block)
 902                 return (0);
 903
 904         /* The Type M Path Table must also be at a valid location
 905          * (although ECMA 119 requires a Type M Path Table, WinISO and
 906          * probably other programs omit it, so we permit a zero here)
 907          *
 908          * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 909         location = archive_be32dec(h+PVD_type_m_path_table_offset);
 910         if ((location > 0 && location < SYSTEM_AREA_BLOCK+2)
 911             || location >= volume_block)
 912                 return (0);
 913
 914         /* Reserved field must be 0. */
 915         /* But accept NetBSD/FreeBSD "makefs" images with 0x20 here. */
 916         for (i = 0; i < PVD_reserved4_size; ++i)
 917                 if (h[PVD_reserved4_offset + i] != 0
 918                     && h[PVD_reserved4_offset + i] != 0x20)
 919                         return (0);
 920
 921         /* Reserved field must be 0. */
 922         for (i = 0; i < PVD_reserved5_size; ++i)
 923                 if (h[PVD_reserved5_offset + i] != 0)
 924                         return (0);
 925
 926         /* XXX TODO: Check other values for sanity; reject more
 927          * malformed PVDs. XXX */
 928
 929         /* Read Root Directory Record in Volume Descriptor. */
 930         p = h + PVD_root_directory_record_offset;
 931         if (p[DR_length_offset] != 34)
 932                 return (0);
 933
 934         if (!iso9660->primary.location) {
 935                 iso9660->logical_block_size = logical_block_size;
 936                 iso9660->volume_block = volume_block;
 937                 iso9660->volume_size = logical_block_size * (uint64_t)volume_block;
 938                 iso9660->primary.location = archive_le32dec(p + DR_extent_offset);
 939                 iso9660->primary.size = archive_le32dec(p + DR_size_offset);
 940         }
 941
 942         return (48);
 943 }
 944
 945 static int
 946 read_children(struct archive_read *a, struct file_info *parent)
 947 {
 948         struct iso9660 *iso9660;
 949         const unsigned char *b, *p;
 950         struct file_info *multi;
 951         size_t step, skip_size;
 952
 953         iso9660 = (struct iso9660 *)(a->format->data);
 954         if (iso9660->current_position > parent->offset) {
 955                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 956                     "Ignoring out-of-order directory (%s) %jd > %jd",
 957                     parent->name.s,
 958                     (intmax_t)iso9660->current_position,
 959                     (intmax_t)parent->offset);
 960                 return (ARCHIVE_WARN);
 961         }
 962         if (parent->offset + parent->size > iso9660->volume_size) {
 963                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 964                     "Directory is beyond end-of-media: %s",
 965                     parent->name.s);
 966                 return (ARCHIVE_WARN);
 967         }
 968         if (iso9660->current_position < parent->offset) {
 969                 int64_t skipsize;
 970
 971                 skipsize = parent->offset - iso9660->current_position;
 972                 skipsize = __archive_read_consume(a, skipsize);
 973                 if (skipsize < 0)
 974                         return ((int)skipsize);
 975                 iso9660->current_position = parent->offset;
 976         }
 977
 978         step = (size_t)(((parent->size + iso9660->logical_block_size -1) /
 979             iso9660->logical_block_size) * iso9660->logical_block_size);
 980         b = __archive_read_ahead(a, step, NULL);
 981         if (b == NULL) {
 982                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 983                     "Failed to read full block when scanning "
 984                     "ISO9660 directory list");
 985                 return (ARCHIVE_FATAL);
 986         }
 987         iso9660->current_position += step;
 988         multi = NULL;
 989         skip_size = step;
 990         while (step) {
 991                 p = b;
 992                 b += iso9660->logical_block_size;
 993                 step -= iso9660->logical_block_size;
 994                 for (; *p != 0 && p < b && p + *p <= b; p += *p) {
 995                         struct file_info *child;
 996
 997                         /* N.B.: these special directory identifiers
 998                          * are 8 bit "values" even on a
 999                          * Joliet CD with UCS-2 (16bit) encoding.
1000                          */
1001
1002                         /* Skip '.' entry. */
1003                         if (*(p + DR_name_len_offset) == 1
1004                             && *(p + DR_name_offset) == '\0')
1005                                 continue;
1006                         /* Skip '..' entry. */
1007                         if (*(p + DR_name_len_offset) == 1
1008                             && *(p + DR_name_offset) == '\001')
1009                                 continue;
1010                         child = parse_file_info(a, parent, p);
1011                         if (child == NULL) {
1012                                 __archive_read_consume(a, skip_size);
1013                                 return (ARCHIVE_FATAL);
1014                         }
1015                         if (child->cl_offset == 0 &&
1016                             (child->multi_extent || multi != NULL)) {
1017                                 struct content *con;
1018
1019                                 if (multi == NULL) {
1020                                         multi = child;
1021                                         multi->contents.first = NULL;
1022                                         multi->contents.last =
1023                                             &(multi->contents.first);
1024                                 }
1025                                 con = malloc(sizeof(struct content));
1026                                 if (con == NULL) {
1027                                         archive_set_error(
1028                                             &a->archive, ENOMEM,
1029                                             "No memory for multi extent");
1030                                         __archive_read_consume(a, skip_size);
1031                                         return (ARCHIVE_FATAL);
1032                                 }
1033                                 con->offset = child->offset;
1034                                 con->size = child->size;
1035                                 con->next = NULL;
1036                                 *multi->contents.last = con;
1037                                 multi->contents.last = &(con->next);
1038                                 if (multi == child) {
1039                                         if (add_entry(a, iso9660, child)
1040                                             != ARCHIVE_OK)
1041                                                 return (ARCHIVE_FATAL);
1042                                 } else {
1043                                         multi->size += child->size;
1044                                         if (!child->multi_extent)
1045                                                 multi = NULL;
1046                                 }
1047                         } else
1048                                 if (add_entry(a, iso9660, child) != ARCHIVE_OK)
1049                                         return (ARCHIVE_FATAL);
1050                 }
1051         }
1052
1053         __archive_read_consume(a, skip_size);
1054
1055         /* Read data which recorded by RRIP "CE" extension. */
1056         if (read_CE(a, iso9660) != ARCHIVE_OK)
1057                 return (ARCHIVE_FATAL);
1058
1059         return (ARCHIVE_OK);
1060 }
1061
1062 static int
1063 archive_read_format_iso9660_read_header(struct archive_read *a,
1064     struct archive_entry *entry)
1065 {
1066         struct iso9660 *iso9660;
1067         struct file_info *file;
1068         int r, rd_r = ARCHIVE_OK;
1069
1070         iso9660 = (struct iso9660 *)(a->format->data);
1071
1072         if (!a->archive.archive_format) {
1073                 a->archive.archive_format = ARCHIVE_FORMAT_ISO9660;
1074                 a->archive.archive_format_name = "ISO9660";
1075         }
1076
1077         if (iso9660->current_position == 0) {
1078                 int64_t skipsize;
1079                 struct vd *vd;
1080                 const void *block;
1081                 char seenJoliet;
1082
1083                 vd = &(iso9660->primary);
1084                 if (!iso9660->opt_support_joliet)
1085                         iso9660->seenJoliet = 0;
1086                 if (iso9660->seenJoliet &&
1087                         vd->location > iso9660->joliet.location)
1088                         /* This condition is unlikely; by way of caution. */
1089                         vd = &(iso9660->joliet);
1090
1091                 skipsize = LOGICAL_BLOCK_SIZE * vd->location;
1092                 skipsize = __archive_read_consume(a, skipsize);
1093                 if (skipsize < 0)
1094                         return ((int)skipsize);
1095                 iso9660->current_position = skipsize;
1096
1097                 block = __archive_read_ahead(a, vd->size, NULL);
1098                 if (block == NULL) {
1099                         archive_set_error(&a->archive,
1100                             ARCHIVE_ERRNO_MISC,
1101                             "Failed to read full block when scanning "
1102                             "ISO9660 directory list");
1103                         return (ARCHIVE_FATAL);
1104                 }
1105
1106                 /*
1107                  * While reading Root Directory, flag seenJoliet
1108                  * must be zero to avoid converting special name
1109                  * 0x00(Current Directory) and next byte to UCS2.
1110                  */
1111                 seenJoliet = iso9660->seenJoliet;/* Save flag. */
1112                 iso9660->seenJoliet = 0;
1113                 file = parse_file_info(a, NULL, block);
1114                 if (file == NULL)
1115                         return (ARCHIVE_FATAL);
1116                 iso9660->seenJoliet = seenJoliet;
1117                 if (vd == &(iso9660->primary) && iso9660->seenRockridge
1118                     && iso9660->seenJoliet)
1119                         /*
1120                          * If iso image has RockRidge and Joliet,
1121                          * we use RockRidge Extensions.
1122                          */
1123                         iso9660->seenJoliet = 0;
1124                 if (vd == &(iso9660->primary) && !iso9660->seenRockridge
1125                     && iso9660->seenJoliet) {
1126                         /* Switch reading data from primary to joliet. */
1127                         vd = &(iso9660->joliet);
1128                         skipsize = LOGICAL_BLOCK_SIZE * vd->location;
1129                         skipsize -= iso9660->current_position;
1130                         skipsize = __archive_read_consume(a, skipsize);
1131                         if (skipsize < 0)
1132                                 return ((int)skipsize);
1133                         iso9660->current_position += skipsize;
1134
1135                         block = __archive_read_ahead(a, vd->size, NULL);
1136                         if (block == NULL) {
1137                                 archive_set_error(&a->archive,
1138                                     ARCHIVE_ERRNO_MISC,
1139                                     "Failed to read full block when scanning "
1140                                     "ISO9660 directory list");
1141                                 return (ARCHIVE_FATAL);
1142                         }
1143                         iso9660->seenJoliet = 0;
1144                         file = parse_file_info(a, NULL, block);
1145                         if (file == NULL)
1146                                 return (ARCHIVE_FATAL);
1147                         iso9660->seenJoliet = seenJoliet;
1148                 }
1149                 /* Store the root directory in the pending list. */
1150                 if (add_entry(a, iso9660, file) != ARCHIVE_OK)
1151                         return (ARCHIVE_FATAL);
1152                 if (iso9660->seenRockridge) {
1153                         a->archive.archive_format =
1154                             ARCHIVE_FORMAT_ISO9660_ROCKRIDGE;
1155                         a->archive.archive_format_name =
1156                             "ISO9660 with Rockridge extensions";
1157                 }
1158         }
1159
1160         file = NULL;/* Eliminate a warning. */
1161         /* Get the next entry that appears after the current offset. */
1162         r = next_entry_seek(a, iso9660, &file);
1163         if (r != ARCHIVE_OK)
1164                 return (r);
1165
1166         if (iso9660->seenJoliet) {
1167                 /*
1168                  * Convert UTF-16BE of a filename to local locale MBS
1169                  * and store the result into a filename field.
1170                  */
1171                 if (iso9660->sconv_utf16be == NULL) {
1172                         iso9660->sconv_utf16be =
1173                             archive_string_conversion_from_charset(
1174                                 &(a->archive), "UTF-16BE", 1);
1175                         if (iso9660->sconv_utf16be == NULL)
1176                                 /* Coundn't allocate memory */
1177                                 return (ARCHIVE_FATAL);
1178                 }
1179                 if (iso9660->utf16be_path == NULL) {
1180                         iso9660->utf16be_path = malloc(UTF16_NAME_MAX);
1181                         if (iso9660->utf16be_path == NULL) {
1182                                 archive_set_error(&a->archive, ENOMEM,
1183                                     "No memory");
1184                                 return (ARCHIVE_FATAL);
1185                         }
1186                 }
1187                 if (iso9660->utf16be_previous_path == NULL) {
1188                         iso9660->utf16be_previous_path = malloc(UTF16_NAME_MAX);
1189                         if (iso9660->utf16be_previous_path == NULL) {
1190                                 archive_set_error(&a->archive, ENOMEM,
1191                                     "No memory");
1192                                 return (ARCHIVE_FATAL);
1193                         }
1194                 }
1195
1196                 iso9660->utf16be_path_len = 0;
1197                 if (build_pathname_utf16be(iso9660->utf16be_path,
1198                     UTF16_NAME_MAX, &(iso9660->utf16be_path_len), file) != 0) {
1199                         archive_set_error(&a->archive,
1200                             ARCHIVE_ERRNO_FILE_FORMAT,
1201                             "Pathname is too long");
1202                 }
1203
1204                 r = archive_entry_copy_pathname_l(entry,
1205                     (const char *)iso9660->utf16be_path,
1206                     iso9660->utf16be_path_len,
1207                     iso9660->sconv_utf16be);
1208                 if (r != 0) {
1209                         if (errno == ENOMEM) {
1210                                 archive_set_error(&a->archive, ENOMEM,
1211                                     "No memory for Pathname");
1212                                 return (ARCHIVE_FATAL);
1213                         }
1214                         archive_set_error(&a->archive,
1215                             ARCHIVE_ERRNO_FILE_FORMAT,
1216                             "Pathname cannot be converted "
1217                             "from %s to current locale.",
1218                             archive_string_conversion_charset_name(
1219                               iso9660->sconv_utf16be));
1220
1221                         rd_r = ARCHIVE_WARN;
1222                 }
1223         } else {
1224                 archive_string_empty(&iso9660->pathname);
1225                 archive_entry_set_pathname(entry,
1226                     build_pathname(&iso9660->pathname, file));
1227         }
1228
1229         iso9660->entry_bytes_remaining = file->size;
1230         iso9660->entry_sparse_offset = 0; /* Offset for sparse-file-aware clients. */
1231
1232         if (file->offset + file->size > iso9660->volume_size) {
1233                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1234                     "File is beyond end-of-media: %s",
1235                     archive_entry_pathname(entry));
1236                 iso9660->entry_bytes_remaining = 0;
1237                 iso9660->entry_sparse_offset = 0;
1238                 return (ARCHIVE_WARN);
1239         }
1240
1241         /* Set up the entry structure with information about this entry. */
1242         archive_entry_set_mode(entry, file->mode);
1243         archive_entry_set_uid(entry, file->uid);
1244         archive_entry_set_gid(entry, file->gid);
1245         archive_entry_set_nlink(entry, file->nlinks);
1246         if (file->birthtime_is_set)
1247                 archive_entry_set_birthtime(entry, file->birthtime, 0);
1248         else
1249                 archive_entry_unset_birthtime(entry);
1250         archive_entry_set_mtime(entry, file->mtime, 0);
1251         archive_entry_set_ctime(entry, file->ctime, 0);
1252         archive_entry_set_atime(entry, file->atime, 0);
1253         /* N.B.: Rock Ridge supports 64-bit device numbers. */
1254         archive_entry_set_rdev(entry, (dev_t)file->rdev);
1255         archive_entry_set_size(entry, iso9660->entry_bytes_remaining);
1256         if (file->symlink.s != NULL)
1257                 archive_entry_copy_symlink(entry, file->symlink.s);
1258
1259         /* Note: If the input isn't seekable, we can't rewind to
1260          * return the same body again, so if the next entry refers to
1261          * the same data, we have to return it as a hardlink to the
1262          * original entry. */
1263         if (file->number != -1 &&
1264             file->number == iso9660->previous_number) {
1265                 if (iso9660->seenJoliet) {
1266                         r = archive_entry_copy_hardlink_l(entry,
1267                             (const char *)iso9660->utf16be_previous_path,
1268                             iso9660->utf16be_previous_path_len,
1269                             iso9660->sconv_utf16be);
1270                         if (r != 0) {
1271                                 if (errno == ENOMEM) {
1272                                         archive_set_error(&a->archive, ENOMEM,
1273                                             "No memory for Linkname");
1274                                         return (ARCHIVE_FATAL);
1275                                 }
1276                                 archive_set_error(&a->archive,
1277                                     ARCHIVE_ERRNO_FILE_FORMAT,
1278                                     "Linkname cannot be converted "
1279                                     "from %s to current locale.",
1280                                     archive_string_conversion_charset_name(
1281                                       iso9660->sconv_utf16be));
1282                                 rd_r = ARCHIVE_WARN;
1283                         }
1284                 } else
1285                         archive_entry_set_hardlink(entry,
1286                             iso9660->previous_pathname.s);
1287                 archive_entry_unset_size(entry);
1288                 iso9660->entry_bytes_remaining = 0;
1289                 iso9660->entry_sparse_offset = 0;
1290                 return (rd_r);
1291         }
1292
1293         /* Except for the hardlink case above, if the offset of the
1294          * next entry is before our current position, we can't seek
1295          * backwards to extract it, so issue a warning.  Note that
1296          * this can only happen if this entry was added to the heap
1297          * after we passed this offset, that is, only if the directory
1298          * mentioning this entry is later than the body of the entry.
1299          * Such layouts are very unusual; most ISO9660 writers lay out
1300          * and record all directory information first, then store
1301          * all file bodies. */
1302         /* TODO: Someday, libarchive's I/O core will support optional
1303          * seeking.  When that day comes, this code should attempt to
1304          * seek and only return the error if the seek fails.  That
1305          * will give us support for whacky ISO images that require
1306          * seeking while retaining the ability to read almost all ISO
1307          * images in a streaming fashion. */
1308         if ((file->mode & AE_IFMT) != AE_IFDIR &&
1309             file->offset < iso9660->current_position) {
1310                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1311                     "Ignoring out-of-order file @%jx (%s) %jd < %jd",
1312                     (intmax_t)file->number,
1313                     iso9660->pathname.s,
1314                     (intmax_t)file->offset,
1315                     (intmax_t)iso9660->current_position);
1316                 iso9660->entry_bytes_remaining = 0;
1317                 iso9660->entry_sparse_offset = 0;
1318                 return (ARCHIVE_WARN);
1319         }
1320
1321         /* Initialize zisofs variables. */
1322         iso9660->entry_zisofs.pz = file->pz;
1323         if (file->pz) {
1324 #ifdef HAVE_ZLIB_H
1325                 struct zisofs  *zisofs;
1326
1327                 zisofs = &iso9660->entry_zisofs;
1328                 zisofs->initialized = 0;
1329                 zisofs->pz_log2_bs = file->pz_log2_bs;
1330                 zisofs->pz_uncompressed_size = file->pz_uncompressed_size;
1331                 zisofs->pz_offset = 0;
1332                 zisofs->header_avail = 0;
1333                 zisofs->header_passed = 0;
1334                 zisofs->block_pointers_avail = 0;
1335 #endif
1336                 archive_entry_set_size(entry, file->pz_uncompressed_size);
1337         }
1338
1339         iso9660->previous_number = file->number;
1340         if (iso9660->seenJoliet) {
1341                 memcpy(iso9660->utf16be_previous_path, iso9660->utf16be_path,
1342                     iso9660->utf16be_path_len);
1343                 iso9660->utf16be_previous_path_len = iso9660->utf16be_path_len;
1344         } else
1345                 archive_strcpy(
1346                     &iso9660->previous_pathname, iso9660->pathname.s);
1347
1348         /* Reset entry_bytes_remaining if the file is multi extent. */
1349         iso9660->entry_content = file->contents.first;
1350         if (iso9660->entry_content != NULL)
1351                 iso9660->entry_bytes_remaining = iso9660->entry_content->size;
1352
1353         if (archive_entry_filetype(entry) == AE_IFDIR) {
1354                 /* Overwrite nlinks by proper link number which is
1355                  * calculated from number of sub directories. */
1356                 archive_entry_set_nlink(entry, 2 + file->subdirs);
1357                 /* Directory data has been read completely. */
1358                 iso9660->entry_bytes_remaining = 0;
1359                 iso9660->entry_sparse_offset = 0;
1360         }
1361
1362         if (rd_r != ARCHIVE_OK)
1363                 return (rd_r);
1364         return (ARCHIVE_OK);
1365 }
1366
1367 static int
1368 archive_read_format_iso9660_read_data_skip(struct archive_read *a)
1369 {
1370         /* Because read_next_header always does an explicit skip
1371          * to the next entry, we don't need to do anything here. */
1372         (void)a; /* UNUSED */
1373         return (ARCHIVE_OK);
1374 }
1375
1376 #ifdef HAVE_ZLIB_H
1377
1378 static int
1379 zisofs_read_data(struct archive_read *a,
1380     const void **buff, size_t *size, int64_t *offset)
1381 {
1382         struct iso9660 *iso9660;
1383         struct zisofs  *zisofs;
1384         const unsigned char *p;
1385         size_t avail;
1386         ssize_t bytes_read;
1387         size_t uncompressed_size;
1388         int r;
1389
1390         iso9660 = (struct iso9660 *)(a->format->data);
1391         zisofs = &iso9660->entry_zisofs;
1392
1393         p = __archive_read_ahead(a, 1, &bytes_read);
1394         if (bytes_read <= 0) {
1395                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1396                     "Truncated zisofs file body");
1397                 return (ARCHIVE_FATAL);
1398         }
1399         if (bytes_read > iso9660->entry_bytes_remaining)
1400                 bytes_read = (ssize_t)iso9660->entry_bytes_remaining;
1401         avail = bytes_read;
1402         uncompressed_size = 0;
1403
1404         if (!zisofs->initialized) {
1405                 size_t ceil, xsize;
1406
1407                 /* Allocate block pointers buffer. */
1408                 ceil = (size_t)((zisofs->pz_uncompressed_size +
1409                         (((int64_t)1) << zisofs->pz_log2_bs) - 1)
1410                         >> zisofs->pz_log2_bs);
1411                 xsize = (ceil + 1) * 4;
1412                 if (zisofs->block_pointers_alloc < xsize) {
1413                         size_t alloc;
1414
1415                         if (zisofs->block_pointers != NULL)
1416                                 free(zisofs->block_pointers);
1417                         alloc = ((xsize >> 10) + 1) << 10;
1418                         zisofs->block_pointers = malloc(alloc);
1419                         if (zisofs->block_pointers == NULL) {
1420                                 archive_set_error(&a->archive, ENOMEM,
1421                                     "No memory for zisofs decompression");
1422                                 return (ARCHIVE_FATAL);
1423                         }
1424                         zisofs->block_pointers_alloc = alloc;
1425                 }
1426                 zisofs->block_pointers_size = xsize;
1427
1428                 /* Allocate uncompressed data buffer. */
1429                 xsize = 1UL << zisofs->pz_log2_bs;
1430                 if (zisofs->uncompressed_buffer_size < xsize) {
1431                         if (zisofs->uncompressed_buffer != NULL)
1432                                 free(zisofs->uncompressed_buffer);
1433                         zisofs->uncompressed_buffer = malloc(xsize);
1434                         if (zisofs->uncompressed_buffer == NULL) {
1435                                 archive_set_error(&a->archive, ENOMEM,
1436                                     "No memory for zisofs decompression");
1437                                 return (ARCHIVE_FATAL);
1438                         }
1439                 }
1440                 zisofs->uncompressed_buffer_size = xsize;
1441
1442                 /*
1443                  * Read the file header, and check the magic code of zisofs.
1444                  */
1445                 if (zisofs->header_avail < sizeof(zisofs->header)) {
1446                         xsize = sizeof(zisofs->header) - zisofs->header_avail;
1447                         if (avail < xsize)
1448                                 xsize = avail;
1449                         memcpy(zisofs->header + zisofs->header_avail, p, xsize);
1450                         zisofs->header_avail += xsize;
1451                         avail -= xsize;
1452                         p += xsize;
1453                 }
1454                 if (!zisofs->header_passed &&
1455                     zisofs->header_avail == sizeof(zisofs->header)) {
1456                         int err = 0;
1457
1458                         if (memcmp(zisofs->header, zisofs_magic,
1459                             sizeof(zisofs_magic)) != 0)
1460                                 err = 1;
1461                         if (archive_le32dec(zisofs->header + 8)
1462                             != zisofs->pz_uncompressed_size)
1463                                 err = 1;
1464                         if (zisofs->header[12] != 4)
1465                                 err = 1;
1466                         if (zisofs->header[13] != zisofs->pz_log2_bs)
1467                                 err = 1;
1468                         if (err) {
1469                                 archive_set_error(&a->archive,
1470                                     ARCHIVE_ERRNO_FILE_FORMAT,
1471                                     "Illegal zisofs file body");
1472                                 return (ARCHIVE_FATAL);
1473                         }
1474                         zisofs->header_passed = 1;
1475                 }
1476                 /*
1477                  * Read block pointers.
1478                  */
1479                 if (zisofs->header_passed &&
1480                     zisofs->block_pointers_avail < zisofs->block_pointers_size) {
1481                         xsize = zisofs->block_pointers_size
1482                             - zisofs->block_pointers_avail;
1483                         if (avail < xsize)
1484                                 xsize = avail;
1485                         memcpy(zisofs->block_pointers
1486                             + zisofs->block_pointers_avail, p, xsize);
1487                         zisofs->block_pointers_avail += xsize;
1488                         avail -= xsize;
1489                         p += xsize;
1490                         if (zisofs->block_pointers_avail
1491                             == zisofs->block_pointers_size) {
1492                                 /* We've got all block pointers and initialize
1493                                  * related variables.   */
1494                                 zisofs->block_off = 0;
1495                                 zisofs->block_avail = 0;
1496                                 /* Complete a initialization */
1497                                 zisofs->initialized = 1;
1498                         }
1499                 }
1500
1501                 if (!zisofs->initialized)
1502                         goto next_data; /* We need more data. */
1503         }
1504
1505         /*
1506          * Get block offsets from block pointers.
1507          */
1508         if (zisofs->block_avail == 0) {
1509                 uint32_t bst, bed;
1510
1511                 if (zisofs->block_off + 4 >= zisofs->block_pointers_size) {
1512                         /* There isn't a pair of offsets. */
1513                         archive_set_error(&a->archive,
1514                             ARCHIVE_ERRNO_FILE_FORMAT,
1515                             "Illegal zisofs block pointers");
1516                         return (ARCHIVE_FATAL);
1517                 }
1518                 bst = archive_le32dec(
1519                     zisofs->block_pointers + zisofs->block_off);
1520                 if (bst != zisofs->pz_offset + (bytes_read - avail)) {
1521                         /* TODO: Should we seek offset of current file
1522                          * by bst ? */
1523                         archive_set_error(&a->archive,
1524                             ARCHIVE_ERRNO_FILE_FORMAT,
1525                             "Illegal zisofs block pointers(cannot seek)");
1526                         return (ARCHIVE_FATAL);
1527                 }
1528                 bed = archive_le32dec(
1529                     zisofs->block_pointers + zisofs->block_off + 4);
1530                 if (bed < bst) {
1531                         archive_set_error(&a->archive,
1532                             ARCHIVE_ERRNO_FILE_FORMAT,
1533                             "Illegal zisofs block pointers");
1534                         return (ARCHIVE_FATAL);
1535                 }
1536                 zisofs->block_avail = bed - bst;
1537                 zisofs->block_off += 4;
1538
1539                 /* Initialize compression library for new block. */
1540                 if (zisofs->stream_valid)
1541                         r = inflateReset(&zisofs->stream);
1542                 else
1543                         r = inflateInit(&zisofs->stream);
1544                 if (r != Z_OK) {
1545                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1546                             "Can't initialize zisofs decompression.");
1547                         return (ARCHIVE_FATAL);
1548                 }
1549                 zisofs->stream_valid = 1;
1550                 zisofs->stream.total_in = 0;
1551                 zisofs->stream.total_out = 0;
1552         }
1553
1554         /*
1555          * Make uncompressed data.
1556          */
1557         if (zisofs->block_avail == 0) {
1558                 memset(zisofs->uncompressed_buffer, 0,
1559                     zisofs->uncompressed_buffer_size);
1560                 uncompressed_size = zisofs->uncompressed_buffer_size;
1561         } else {
1562                 zisofs->stream.next_in = (Bytef *)(uintptr_t)(const void *)p;
1563                 if (avail > zisofs->block_avail)
1564                         zisofs->stream.avail_in = zisofs->block_avail;
1565                 else
1566                         zisofs->stream.avail_in = avail;
1567                 zisofs->stream.next_out = zisofs->uncompressed_buffer;
1568                 zisofs->stream.avail_out = zisofs->uncompressed_buffer_size;
1569
1570                 r = inflate(&zisofs->stream, 0);
1571                 switch (r) {
1572                 case Z_OK: /* Decompressor made some progress.*/
1573                 case Z_STREAM_END: /* Found end of stream. */
1574                         break;
1575                 default:
1576                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1577                             "zisofs decompression failed (%d)", r);
1578                         return (ARCHIVE_FATAL);
1579                 }
1580                 uncompressed_size =
1581                     zisofs->uncompressed_buffer_size - zisofs->stream.avail_out;
1582                 avail -= zisofs->stream.next_in - p;
1583                 zisofs->block_avail -= zisofs->stream.next_in - p;
1584         }
1585 next_data:
1586         bytes_read -= avail;
1587         *buff = zisofs->uncompressed_buffer;
1588         *size = uncompressed_size;
1589         *offset = iso9660->entry_sparse_offset;
1590         iso9660->entry_sparse_offset += uncompressed_size;
1591         iso9660->entry_bytes_remaining -= bytes_read;
1592         iso9660->current_position += bytes_read;
1593         zisofs->pz_offset += bytes_read;
1594         iso9660->entry_bytes_unconsumed += bytes_read;
1595
1596         return (ARCHIVE_OK);
1597 }
1598
1599 #else /* HAVE_ZLIB_H */
1600
1601 static int
1602 zisofs_read_data(struct archive_read *a,
1603     const void **buff, size_t *size, int64_t *offset)
1604 {
1605
1606         (void)buff;/* UNUSED */
1607         (void)size;/* UNUSED */
1608         (void)offset;/* UNUSED */
1609         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1610             "zisofs is not supported on this platform.");
1611         return (ARCHIVE_FAILED);
1612 }
1613
1614 #endif /* HAVE_ZLIB_H */
1615
1616 static int
1617 archive_read_format_iso9660_read_data(struct archive_read *a,
1618     const void **buff, size_t *size, int64_t *offset)
1619 {
1620         ssize_t bytes_read;
1621         struct iso9660 *iso9660;
1622
1623         iso9660 = (struct iso9660 *)(a->format->data);
1624
1625         if (iso9660->entry_bytes_unconsumed) {
1626                 __archive_read_consume(a, iso9660->entry_bytes_unconsumed);
1627                 iso9660->entry_bytes_unconsumed = 0;
1628         }
1629
1630         if (iso9660->entry_bytes_remaining <= 0) {
1631                 if (iso9660->entry_content != NULL)
1632                         iso9660->entry_content = iso9660->entry_content->next;
1633                 if (iso9660->entry_content == NULL) {
1634                         *buff = NULL;
1635                         *size = 0;
1636                         *offset = iso9660->entry_sparse_offset;
1637                         return (ARCHIVE_EOF);
1638                 }
1639                 /* Seek forward to the start of the entry. */
1640                 if (iso9660->current_position < iso9660->entry_content->offset) {
1641                         int64_t step;
1642
1643                         step = iso9660->entry_content->offset -
1644                             iso9660->current_position;
1645                         step = __archive_read_consume(a, step);
1646                         if (step < 0)
1647                                 return ((int)step);
1648                         iso9660->current_position =
1649                             iso9660->entry_content->offset;
1650                 }
1651                 if (iso9660->entry_content->offset < iso9660->current_position) {
1652                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1653                             "Ignoring out-of-order file (%s) %jd < %jd",
1654                             iso9660->pathname.s,
1655                             (intmax_t)iso9660->entry_content->offset,
1656                             (intmax_t)iso9660->current_position);
1657                         *buff = NULL;
1658                         *size = 0;
1659                         *offset = iso9660->entry_sparse_offset;
1660                         return (ARCHIVE_WARN);
1661                 }
1662                 iso9660->entry_bytes_remaining = iso9660->entry_content->size;
1663         }
1664         if (iso9660->entry_zisofs.pz)
1665                 return (zisofs_read_data(a, buff, size, offset));
1666
1667         *buff = __archive_read_ahead(a, 1, &bytes_read);
1668         if (bytes_read == 0)
1669                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1670                     "Truncated input file");
1671         if (*buff == NULL)
1672                 return (ARCHIVE_FATAL);
1673         if (bytes_read > iso9660->entry_bytes_remaining)
1674                 bytes_read = (ssize_t)iso9660->entry_bytes_remaining;
1675         *size = bytes_read;
1676         *offset = iso9660->entry_sparse_offset;
1677         iso9660->entry_sparse_offset += bytes_read;
1678         iso9660->entry_bytes_remaining -= bytes_read;
1679         iso9660->entry_bytes_unconsumed = bytes_read;
1680         iso9660->current_position += bytes_read;
1681         return (ARCHIVE_OK);
1682 }
1683
1684 static int
1685 archive_read_format_iso9660_cleanup(struct archive_read *a)
1686 {
1687         struct iso9660 *iso9660;
1688         int r = ARCHIVE_OK;
1689
1690         iso9660 = (struct iso9660 *)(a->format->data);
1691         release_files(iso9660);
1692         free(iso9660->read_ce_req.reqs);
1693         archive_string_free(&iso9660->pathname);
1694         archive_string_free(&iso9660->previous_pathname);
1695         if (iso9660->pending_files.files)
1696                 free(iso9660->pending_files.files);
1697 #ifdef HAVE_ZLIB_H
1698         free(iso9660->entry_zisofs.uncompressed_buffer);
1699         free(iso9660->entry_zisofs.block_pointers);
1700         if (iso9660->entry_zisofs.stream_valid) {
1701                 if (inflateEnd(&iso9660->entry_zisofs.stream) != Z_OK) {
1702                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1703                             "Failed to clean up zlib decompressor");
1704                         r = ARCHIVE_FATAL;
1705                 }
1706         }
1707 #endif
1708         free(iso9660->utf16be_path);
1709         free(iso9660->utf16be_previous_path);
1710         free(iso9660);
1711         (a->format->data) = NULL;
1712         return (r);
1713 }
1714
1715 /*
1716  * This routine parses a single ISO directory record, makes sense
1717  * of any extensions, and stores the result in memory.
1718  */
1719 static struct file_info *
1720 parse_file_info(struct archive_read *a, struct file_info *parent,
1721     const unsigned char *isodirrec)
1722 {
1723         struct iso9660 *iso9660;
1724         struct file_info *file;
1725         size_t name_len;
1726         const unsigned char *rr_start, *rr_end;
1727         const unsigned char *p;
1728         size_t dr_len;
1729         uint64_t fsize;
1730         int32_t location;
1731         int flags;
1732
1733         iso9660 = (struct iso9660 *)(a->format->data);
1734
1735         dr_len = (size_t)isodirrec[DR_length_offset];
1736         name_len = (size_t)isodirrec[DR_name_len_offset];
1737         location = archive_le32dec(isodirrec + DR_extent_offset);
1738         fsize = toi(isodirrec + DR_size_offset, DR_size_size);
1739         /* Sanity check that dr_len needs at least 34. */
1740         if (dr_len < 34) {
1741                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1742                     "Invalid length of directory record");
1743                 return (NULL);
1744         }
1745         /* Sanity check that name_len doesn't exceed dr_len. */
1746         if (dr_len - 33 < name_len || name_len == 0) {
1747                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1748                     "Invalid length of file identifier");
1749                 return (NULL);
1750         }
1751         /* Sanity check that location doesn't exceed volume block.
1752          * Don't check lower limit of location; it's possibility
1753          * the location has negative value when file type is symbolic
1754          * link or file size is zero. As far as I know latest mkisofs
1755          * do that.
1756          */
1757         if (location > 0 &&
1758             (location + ((fsize + iso9660->logical_block_size -1)
1759                / iso9660->logical_block_size))
1760                         > (uint32_t)iso9660->volume_block) {
1761                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1762                     "Invalid location of extent of file");
1763                 return (NULL);
1764         }
1765         /* Sanity check that location doesn't have a negative value
1766          * when the file is not empty. it's too large. */
1767         if (fsize != 0 && location < 0) {
1768                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1769                     "Invalid location of extent of file");
1770                 return (NULL);
1771         }
1772
1773         /* Create a new file entry and copy data from the ISO dir record. */
1774         file = (struct file_info *)calloc(1, sizeof(*file));
1775         if (file == NULL) {
1776                 archive_set_error(&a->archive, ENOMEM,
1777                     "No memory for file entry");
1778                 return (NULL);
1779         }
1780         file->parent = parent;
1781         file->offset = iso9660->logical_block_size * (uint64_t)location;
1782         file->size = fsize;
1783         file->mtime = isodate7(isodirrec + DR_date_offset);
1784         file->ctime = file->atime = file->mtime;
1785         file->rede_files.first = NULL;
1786         file->rede_files.last = &(file->rede_files.first);
1787
1788         p = isodirrec + DR_name_offset;
1789         /* Rockridge extensions (if any) follow name.  Compute this
1790          * before fidgeting the name_len below. */
1791         rr_start = p + name_len + (name_len & 1 ? 0 : 1);
1792         rr_end = isodirrec + dr_len;
1793
1794         if (iso9660->seenJoliet) {
1795                 /* Joliet names are max 64 chars (128 bytes) according to spec,
1796                  * but genisoimage/mkisofs allows recording longer Joliet
1797                  * names which are 103 UCS2 characters(206 bytes) by their
1798                  * option '-joliet-long'.
1799                  */
1800                 if (name_len > 206)
1801                         name_len = 206;
1802                 name_len &= ~1;
1803
1804                 /* trim trailing first version and dot from filename.
1805                  *
1806                  * Remember we were in UTF-16BE land!
1807                  * SEPARATOR 1 (.) and SEPARATOR 2 (;) are both
1808                  * 16 bits big endian characters on Joliet.
1809                  *
1810                  * TODO: sanitize filename?
1811                  *       Joliet allows any UCS-2 char except:
1812                  *       *, /, :, ;, ? and \.
1813                  */
1814                 /* Chop off trailing ';1' from files. */
1815                 if (name_len > 4 && p[name_len-4] == 0 && p[name_len-3] == ';'
1816                     && p[name_len-2] == 0 && p[name_len-1] == '1')
1817                         name_len -= 4;
1818 #if 0 /* XXX: this somehow manages to strip of single-character file extensions, like '.c'. */
1819                 /* Chop off trailing '.' from filenames. */
1820                 if (name_len > 2 && p[name_len-2] == 0 && p[name_len-1] == '.')
1821                         name_len -= 2;
1822 #endif
1823                 if ((file->utf16be_name = malloc(name_len)) == NULL) {
1824                         archive_set_error(&a->archive, ENOMEM,
1825                             "No memory for file name");
1826                         return (NULL);
1827                 }
1828                 memcpy(file->utf16be_name, p, name_len);
1829                 file->utf16be_bytes = name_len;
1830         } else {
1831                 /* Chop off trailing ';1' from files. */
1832                 if (name_len > 2 && p[name_len - 2] == ';' &&
1833                                 p[name_len - 1] == '1')
1834                         name_len -= 2;
1835                 /* Chop off trailing '.' from filenames. */
1836                 if (name_len > 1 && p[name_len - 1] == '.')
1837                         --name_len;
1838
1839                 archive_strncpy(&file->name, (const char *)p, name_len);
1840         }
1841
1842         flags = isodirrec[DR_flags_offset];
1843         if (flags & 0x02)
1844                 file->mode = AE_IFDIR | 0700;
1845         else
1846                 file->mode = AE_IFREG | 0400;
1847         if (flags & 0x80)
1848                 file->multi_extent = 1;
1849         else
1850                 file->multi_extent = 0;
1851         /*
1852          * Use a location for the file number, which is treated as an inode
1853          * number to find out hardlink target. If Rockridge extensions is
1854          * being used, the file number will be overwritten by FILE SERIAL
1855          * NUMBER of RRIP "PX" extension.
1856          * Note: Old mkisofs did not record that FILE SERIAL NUMBER
1857          * in ISO images.
1858          * Note2: xorriso set 0 to the location of a symlink file.
1859          */
1860         if (file->size == 0 && location >= 0) {
1861                 /* If file->size is zero, its location points wrong place,
1862                  * and so we should not use it for the file number.
1863                  * When the location has negative value, it can be used
1864                  * for the file number.
1865                  */
1866                 file->number = -1;
1867                 /* Do not appear before any directory entries. */
1868                 file->offset = -1;
1869         } else
1870                 file->number = (int64_t)(uint32_t)location;
1871
1872         /* Rockridge extensions overwrite information from above. */
1873         if (iso9660->opt_support_rockridge) {
1874                 if (parent == NULL && rr_end - rr_start >= 7) {
1875                         p = rr_start;
1876                         if (p[0] == 'S' && p[1] == 'P'
1877                             && p[2] == 7 && p[3] == 1
1878                             && p[4] == 0xBE && p[5] == 0xEF) {
1879                                 /*
1880                                  * SP extension stores the suspOffset
1881                                  * (Number of bytes to skip between
1882                                  * filename and SUSP records.)
1883                                  * It is mandatory by the SUSP standard
1884                                  * (IEEE 1281).
1885                                  *
1886                                  * It allows SUSP to coexist with
1887                                  * non-SUSP uses of the System
1888                                  * Use Area by placing non-SUSP data
1889                                  * before SUSP data.
1890                                  *
1891                                  * SP extension must be in the root
1892                                  * directory entry, disable all SUSP
1893                                  * processing if not found.
1894                                  */
1895                                 iso9660->suspOffset = p[6];
1896                                 iso9660->seenSUSP = 1;
1897                                 rr_start += 7;
1898                         }
1899                 }
1900                 if (iso9660->seenSUSP) {
1901                         int r;
1902
1903                         file->name_continues = 0;
1904                         file->symlink_continues = 0;
1905                         rr_start += iso9660->suspOffset;
1906                         r = parse_rockridge(a, file, rr_start, rr_end);
1907                         if (r != ARCHIVE_OK) {
1908                                 free(file);
1909                                 return (NULL);
1910                         }
1911                         /*
1912                          * A file size of symbolic link files in ISO images
1913                          * made by makefs is not zero and its location is
1914                          * the same as those of next regular file. That is
1915                          * the same as hard like file and it causes unexpected
1916                          * error.
1917                          */
1918                         if (file->size > 0 &&
1919                             (file->mode & AE_IFMT) == AE_IFLNK) {
1920                                 file->size = 0;
1921                                 file->number = -1;
1922                                 file->offset = -1;
1923                         }
1924                 } else
1925                         /* If there isn't SUSP, disable parsing
1926                          * rock ridge extensions. */
1927                         iso9660->opt_support_rockridge = 0;
1928         }
1929
1930         file->nlinks = 1;/* Reset nlink. we'll calculate it later. */
1931         /* Tell file's parent how many children that parent has. */
1932         if (parent != NULL && (flags & 0x02))
1933                 parent->subdirs++;
1934
1935         if (iso9660->seenRockridge) {
1936                 if (parent != NULL && parent->parent == NULL &&
1937                     (flags & 0x02) && iso9660->rr_moved == NULL &&
1938                     (strcmp(file->name.s, "rr_moved") == 0 ||
1939                      strcmp(file->name.s, ".rr_moved") == 0)) {
1940                         iso9660->rr_moved = file;
1941                         file->rr_moved = 1;
1942                         file->rr_moved_has_re_only = 1;
1943                         file->re = 0;
1944                         parent->subdirs--;
1945                 } else if (file->re) {
1946                         /*
1947                          * Sanity check: file's parent is rr_moved.
1948                          */
1949                         if (parent == NULL || parent->rr_moved == 0) {
1950                                 archive_set_error(&a->archive,
1951                                     ARCHIVE_ERRNO_MISC,
1952                                     "Invalid Rockridge RE");
1953                                 return (NULL);
1954                         }
1955                         /*
1956                          * Sanity check: file does not have "CL" extension.
1957                          */
1958                         if (file->cl_offset) {
1959                                 archive_set_error(&a->archive,
1960                                     ARCHIVE_ERRNO_MISC,
1961                                     "Invalid Rockridge RE and CL");
1962                                 return (NULL);
1963                         }
1964                         /*
1965                          * Sanity check: The file type must be a directory.
1966                          */
1967                         if ((flags & 0x02) == 0) {
1968                                 archive_set_error(&a->archive,
1969                                     ARCHIVE_ERRNO_MISC,
1970                                     "Invalid Rockridge RE");
1971                                 return (NULL);
1972                         }
1973                 } else if (parent != NULL && parent->rr_moved)
1974                         file->rr_moved_has_re_only = 0;
1975                 else if (parent != NULL && (flags & 0x02) &&
1976                     (parent->re || parent->re_descendant))
1977                         file->re_descendant = 1;
1978                 if (file->cl_offset) {
1979                         struct file_info *r;
1980
1981                         if (parent == NULL || parent->parent == NULL) {
1982                                 archive_set_error(&a->archive,
1983                                     ARCHIVE_ERRNO_MISC,
1984                                     "Invalid Rockridge CL");
1985                                 return (NULL);
1986                         }
1987                         /*
1988                          * Sanity check: The file type must be a regular file.
1989                          */
1990                         if ((flags & 0x02) != 0) {
1991                                 archive_set_error(&a->archive,
1992                                     ARCHIVE_ERRNO_MISC,
1993                                     "Invalid Rockridge CL");
1994                                 return (NULL);
1995                         }
1996                         parent->subdirs++;
1997                         /* Overwrite an offset and a number of this "CL" entry
1998                          * to appear before other dirs. "+1" to those is to
1999                          * make sure to appear after "RE" entry which this
2000                          * "CL" entry should be connected with. */
2001                         file->offset = file->number = file->cl_offset + 1;
2002
2003                         /*
2004                          * Sanity check: cl_offset does not point at its
2005                          * the parents or itself.
2006                          */
2007                         for (r = parent; r; r = r->parent) {
2008                                 if (r->offset == file->cl_offset) {
2009                                         archive_set_error(&a->archive,
2010                                             ARCHIVE_ERRNO_MISC,
2011                                             "Invalid Rockridge CL");
2012                                         return (NULL);
2013                                 }
2014                         }
2015                         if (file->cl_offset == file->offset ||
2016                             parent->rr_moved) {
2017                                 archive_set_error(&a->archive,
2018                                     ARCHIVE_ERRNO_MISC,
2019                                     "Invalid Rockridge CL");
2020                                 return (NULL);
2021                         }
2022                 }
2023         }
2024
2025 #if DEBUG
2026         /* DEBUGGING: Warn about attributes I don't yet fully support. */
2027         if ((flags & ~0x02) != 0) {
2028                 fprintf(stderr, "\n ** Unrecognized flag: ");
2029                 dump_isodirrec(stderr, isodirrec);
2030                 fprintf(stderr, "\n");
2031         } else if (toi(isodirrec + DR_volume_sequence_number_offset, 2) != 1) {
2032                 fprintf(stderr, "\n ** Unrecognized sequence number: ");
2033                 dump_isodirrec(stderr, isodirrec);
2034                 fprintf(stderr, "\n");
2035         } else if (*(isodirrec + DR_file_unit_size_offset) != 0) {
2036                 fprintf(stderr, "\n ** Unexpected file unit size: ");
2037                 dump_isodirrec(stderr, isodirrec);
2038                 fprintf(stderr, "\n");
2039         } else if (*(isodirrec + DR_interleave_offset) != 0) {
2040                 fprintf(stderr, "\n ** Unexpected interleave: ");
2041                 dump_isodirrec(stderr, isodirrec);
2042                 fprintf(stderr, "\n");
2043         } else if (*(isodirrec + DR_ext_attr_length_offset) != 0) {
2044                 fprintf(stderr, "\n ** Unexpected extended attribute length: ");
2045                 dump_isodirrec(stderr, isodirrec);
2046                 fprintf(stderr, "\n");
2047         }
2048 #endif
2049         register_file(iso9660, file);
2050         return (file);
2051 }
2052
2053 static int
2054 parse_rockridge(struct archive_read *a, struct file_info *file,
2055     const unsigned char *p, const unsigned char *end)
2056 {
2057         struct iso9660 *iso9660;
2058
2059         iso9660 = (struct iso9660 *)(a->format->data);
2060
2061         while (p + 4 <= end  /* Enough space for another entry. */
2062             && p[0] >= 'A' && p[0] <= 'Z' /* Sanity-check 1st char of name. */
2063             && p[1] >= 'A' && p[1] <= 'Z' /* Sanity-check 2nd char of name. */
2064             && p[2] >= 4 /* Sanity-check length. */
2065             && p + p[2] <= end) { /* Sanity-check length. */
2066                 const unsigned char *data = p + 4;
2067                 int data_length = p[2] - 4;
2068                 int version = p[3];
2069
2070                 /*
2071                  * Yes, each 'if' here does test p[0] again.
2072                  * Otherwise, the fall-through handling to catch
2073                  * unsupported extensions doesn't work.
2074                  */
2075                 switch(p[0]) {
2076                 case 'C':
2077                         if (p[0] == 'C' && p[1] == 'E') {
2078                                 if (version == 1 && data_length == 24) {
2079                                         /*
2080                                          * CE extension comprises:
2081                                          *   8 byte sector containing extension
2082                                          *   8 byte offset w/in above sector
2083                                          *   8 byte length of continuation
2084                                          */
2085                                         int32_t location =
2086                                             archive_le32dec(data);
2087                                         file->ce_offset =
2088                                             archive_le32dec(data+8);
2089                                         file->ce_size =
2090                                             archive_le32dec(data+16);
2091                                         if (register_CE(a, location, file)
2092                                             != ARCHIVE_OK)
2093                                                 return (ARCHIVE_FATAL);
2094                                 }
2095                                 break;
2096                         }
2097                         if (p[0] == 'C' && p[1] == 'L') {
2098                                 if (version == 1 && data_length == 8) {
2099                                         file->cl_offset = (uint64_t)
2100                                             iso9660->logical_block_size *
2101                                             (uint64_t)archive_le32dec(data);
2102                                         iso9660->seenRockridge = 1;
2103                                 }
2104                                 break;
2105                         }
2106                         /* FALLTHROUGH */
2107                 case 'N':
2108                         if (p[0] == 'N' && p[1] == 'M') {
2109                                 if (version == 1) {
2110                                         parse_rockridge_NM1(file,
2111                                             data, data_length);
2112                                         iso9660->seenRockridge = 1;
2113                                 }
2114                                 break;
2115                         }
2116                         /* FALLTHROUGH */
2117                 case 'P':
2118                         if (p[0] == 'P' && p[1] == 'D') {
2119                                 /*
2120                                  * PD extension is padding;
2121                                  * contents are always ignored.
2122                                  */
2123                                 break;
2124                         }
2125                         if (p[0] == 'P' && p[1] == 'L') {
2126                                 /*
2127                                  * PL extension won't appear;
2128                                  * contents are always ignored.
2129                                  */
2130                                 break;
2131                         }
2132                         if (p[0] == 'P' && p[1] == 'N') {
2133                                 if (version == 1 && data_length == 16) {
2134                                         file->rdev = toi(data,4);
2135                                         file->rdev <<= 32;
2136                                         file->rdev |= toi(data + 8, 4);
2137                                         iso9660->seenRockridge = 1;
2138                                 }
2139                                 break;
2140                         }
2141                         if (p[0] == 'P' && p[1] == 'X') {
2142                                 /*
2143                                  * PX extension comprises:
2144                                  *   8 bytes for mode,
2145                                  *   8 bytes for nlinks,
2146                                  *   8 bytes for uid,
2147                                  *   8 bytes for gid,
2148                                  *   8 bytes for inode.
2149                                  */
2150                                 if (version == 1) {
2151                                         if (data_length >= 8)
2152                                                 file->mode
2153                                                     = toi(data, 4);
2154                                         if (data_length >= 16)
2155                                                 file->nlinks
2156                                                     = toi(data + 8, 4);
2157                                         if (data_length >= 24)
2158                                                 file->uid
2159                                                     = toi(data + 16, 4);
2160                                         if (data_length >= 32)
2161                                                 file->gid
2162                                                     = toi(data + 24, 4);
2163                                         if (data_length >= 40)
2164                                                 file->number
2165                                                     = toi(data + 32, 4);
2166                                         iso9660->seenRockridge = 1;
2167                                 }
2168                                 break;
2169                         }
2170                         /* FALLTHROUGH */
2171                 case 'R':
2172                         if (p[0] == 'R' && p[1] == 'E' && version == 1) {
2173                                 file->re = 1;
2174                                 iso9660->seenRockridge = 1;
2175                                 break;
2176                         }
2177                         if (p[0] == 'R' && p[1] == 'R' && version == 1) {
2178                                 /*
2179                                  * RR extension comprises:
2180                                  *    one byte flag value
2181                                  * This extension is obsolete,
2182                                  * so contents are always ignored.
2183                                  */
2184                                 break;
2185                         }
2186                         /* FALLTHROUGH */
2187                 case 'S':
2188                         if (p[0] == 'S' && p[1] == 'L') {
2189                                 if (version == 1) {
2190                                         parse_rockridge_SL1(file,
2191                                             data, data_length);
2192                                         iso9660->seenRockridge = 1;
2193                                 }
2194                                 break;
2195                         }
2196                         if (p[0] == 'S' && p[1] == 'T'
2197                             && data_length == 0 && version == 1) {
2198                                 /*
2199                                  * ST extension marks end of this
2200                                  * block of SUSP entries.
2201                                  *
2202                                  * It allows SUSP to coexist with
2203                                  * non-SUSP uses of the System
2204                                  * Use Area by placing non-SUSP data
2205                                  * after SUSP data.
2206                                  */
2207                                 iso9660->seenSUSP = 0;
2208                                 iso9660->seenRockridge = 0;
2209                                 return (ARCHIVE_OK);
2210                         }
2211                 case 'T':
2212                         if (p[0] == 'T' && p[1] == 'F') {
2213                                 if (version == 1) {
2214                                         parse_rockridge_TF1(file,
2215                                             data, data_length);
2216                                         iso9660->seenRockridge = 1;
2217                                 }
2218                                 break;
2219                         }
2220                         /* FALLTHROUGH */
2221                 case 'Z':
2222                         if (p[0] == 'Z' && p[1] == 'F') {
2223                                 if (version == 1)
2224                                         parse_rockridge_ZF1(file,
2225                                             data, data_length);
2226                                 break;
2227                         }
2228                         /* FALLTHROUGH */
2229                 default:
2230                         /* The FALLTHROUGHs above leave us here for
2231                          * any unsupported extension. */
2232                         break;
2233                 }
2234
2235
2236
2237                 p += p[2];
2238         }
2239         return (ARCHIVE_OK);
2240 }
2241
2242 static int
2243 register_CE(struct archive_read *a, int32_t location,
2244     struct file_info *file)
2245 {
2246         struct iso9660 *iso9660;
2247         struct read_ce_queue *heap;
2248         struct read_ce_req *p;
2249         uint64_t offset, parent_offset;
2250         int hole, parent;
2251
2252         iso9660 = (struct iso9660 *)(a->format->data);
2253         offset = ((uint64_t)location) * (uint64_t)iso9660->logical_block_size;
2254         if (((file->mode & AE_IFMT) == AE_IFREG &&
2255             offset >= file->offset) ||
2256             offset < iso9660->current_position ||
2257             (((uint64_t)file->ce_offset) + file->ce_size)
2258               > (uint64_t)iso9660->logical_block_size ||
2259             offset + file->ce_offset + file->ce_size
2260                   > iso9660->volume_size) {
2261                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2262                     "Invalid parameter in SUSP \"CE\" extension");
2263                 return (ARCHIVE_FATAL);
2264         }
2265
2266         /* Expand our CE list as necessary. */
2267         heap = &(iso9660->read_ce_req);
2268         if (heap->cnt >= heap->allocated) {
2269                 int new_size;
2270
2271                 if (heap->allocated < 16)
2272                         new_size = 16;
2273                 else
2274                         new_size = heap->allocated * 2;
2275                 /* Overflow might keep us from growing the list. */
2276                 if (new_size <= heap->allocated) {
2277                         archive_set_error(&a->archive, ENOMEM, "Out of memory");
2278                         return (ARCHIVE_FATAL);
2279                 }
2280                 p = calloc(new_size, sizeof(p[0]));
2281                 if (p == NULL) {
2282                         archive_set_error(&a->archive, ENOMEM, "Out of memory");
2283                         return (ARCHIVE_FATAL);
2284                 }
2285                 if (heap->reqs != NULL) {
2286                         memcpy(p, heap->reqs, heap->cnt * sizeof(*p));
2287                         free(heap->reqs);
2288                 }
2289                 heap->reqs = p;
2290                 heap->allocated = new_size;
2291         }
2292
2293         /*
2294          * Start with hole at end, walk it up tree to find insertion point.
2295          */
2296         hole = heap->cnt++;
2297         while (hole > 0) {
2298                 parent = (hole - 1)/2;
2299                 parent_offset = heap->reqs[parent].offset;
2300                 if (offset >= parent_offset) {
2301                         heap->reqs[hole].offset = offset;
2302                         heap->reqs[hole].file = file;
2303                         return (ARCHIVE_OK);
2304                 }
2305                 /* Move parent into hole <==> move hole up tree. */
2306                 heap->reqs[hole] = heap->reqs[parent];
2307                 hole = parent;
2308         }
2309         heap->reqs[0].offset = offset;
2310         heap->reqs[0].file = file;
2311         return (ARCHIVE_OK);
2312 }
2313
2314 static void
2315 next_CE(struct read_ce_queue *heap)
2316 {
2317         uint64_t a_offset, b_offset, c_offset;
2318         int a, b, c;
2319         struct read_ce_req tmp;
2320
2321         if (heap->cnt < 1)
2322                 return;
2323
2324         /*
2325          * Move the last item in the heap to the root of the tree
2326          */
2327         heap->reqs[0] = heap->reqs[--(heap->cnt)];
2328
2329         /*
2330          * Rebalance the heap.
2331          */
2332         a = 0; /* Starting element and its offset */
2333         a_offset = heap->reqs[a].offset;
2334         for (;;) {
2335                 b = a + a + 1; /* First child */
2336                 if (b >= heap->cnt)
2337                         return;
2338                 b_offset = heap->reqs[b].offset;
2339                 c = b + 1; /* Use second child if it is smaller. */
2340                 if (c < heap->cnt) {
2341                         c_offset = heap->reqs[c].offset;
2342                         if (c_offset < b_offset) {
2343                                 b = c;
2344                                 b_offset = c_offset;
2345                         }
2346                 }
2347                 if (a_offset <= b_offset)
2348                         return;
2349                 tmp = heap->reqs[a];
2350                 heap->reqs[a] = heap->reqs[b];
2351                 heap->reqs[b] = tmp;
2352                 a = b;
2353         }
2354 }
2355
2356
2357 static int
2358 read_CE(struct archive_read *a, struct iso9660 *iso9660)
2359 {
2360         struct read_ce_queue *heap;
2361         const unsigned char *b, *p, *end;
2362         struct file_info *file;
2363         size_t step;
2364         int r;
2365
2366         /* Read data which RRIP "CE" extension points. */
2367         heap = &(iso9660->read_ce_req);
2368         step = iso9660->logical_block_size;
2369         while (heap->cnt &&
2370             heap->reqs[0].offset == iso9660->current_position) {
2371                 b = __archive_read_ahead(a, step, NULL);
2372                 if (b == NULL) {
2373                         archive_set_error(&a->archive,
2374                             ARCHIVE_ERRNO_MISC,
2375                             "Failed to read full block when scanning "
2376                             "ISO9660 directory list");
2377                         return (ARCHIVE_FATAL);
2378                 }
2379                 do {
2380                         file = heap->reqs[0].file;
2381                         if (file->ce_offset + file->ce_size > step) {
2382                                 archive_set_error(&a->archive,
2383                                     ARCHIVE_ERRNO_FILE_FORMAT,
2384                                     "Malformed CE information");
2385                                 return (ARCHIVE_FATAL);
2386                         }
2387                         p = b + file->ce_offset;
2388                         end = p + file->ce_size;
2389                         next_CE(heap);
2390                         r = parse_rockridge(a, file, p, end);
2391                         if (r != ARCHIVE_OK)
2392                                 return (ARCHIVE_FATAL);
2393                 } while (heap->cnt &&
2394                     heap->reqs[0].offset == iso9660->current_position);
2395                 /* NOTE: Do not move this consume's code to fron of
2396                  * do-while loop. Registration of nested CE extension
2397                  * might cause error because of current position. */
2398                 __archive_read_consume(a, step);
2399                 iso9660->current_position += step;
2400         }
2401         return (ARCHIVE_OK);
2402 }
2403
2404 static void
2405 parse_rockridge_NM1(struct file_info *file,
2406                     const unsigned char *data, int data_length)
2407 {
2408         if (!file->name_continues)
2409                 archive_string_empty(&file->name);
2410         file->name_continues = 0;
2411         if (data_length < 1)
2412                 return;
2413         /*
2414          * NM version 1 extension comprises:
2415          *   1 byte flag, value is one of:
2416          *     = 0: remainder is name
2417          *     = 1: remainder is name, next NM entry continues name
2418          *     = 2: "."
2419          *     = 4: ".."
2420          *     = 32: Implementation specific
2421          *     All other values are reserved.
2422          */
2423         switch(data[0]) {
2424         case 0:
2425                 if (data_length < 2)
2426                         return;
2427                 archive_strncat(&file->name,
2428                     (const char *)data + 1, data_length - 1);
2429                 break;
2430         case 1:
2431                 if (data_length < 2)
2432                         return;
2433                 archive_strncat(&file->name,
2434                     (const char *)data + 1, data_length - 1);
2435                 file->name_continues = 1;
2436                 break;
2437         case 2:
2438                 archive_strcat(&file->name, ".");
2439                 break;
2440         case 4:
2441                 archive_strcat(&file->name, "..");
2442                 break;
2443         default:
2444                 return;
2445         }
2446
2447 }
2448
2449 static void
2450 parse_rockridge_TF1(struct file_info *file, const unsigned char *data,
2451     int data_length)
2452 {
2453         char flag;
2454         /*
2455          * TF extension comprises:
2456          *   one byte flag
2457          *   create time (optional)
2458          *   modify time (optional)
2459          *   access time (optional)
2460          *   attribute time (optional)
2461          *  Time format and presence of fields
2462          *  is controlled by flag bits.
2463          */
2464         if (data_length < 1)
2465                 return;
2466         flag = data[0];
2467         ++data;
2468         --data_length;
2469         if (flag & 0x80) {
2470                 /* Use 17-byte time format. */
2471                 if ((flag & 1) && data_length >= 17) {
2472                         /* Create time. */
2473                         file->birthtime_is_set = 1;
2474                         file->birthtime = isodate17(data);
2475                         data += 17;
2476                         data_length -= 17;
2477                 }
2478                 if ((flag & 2) && data_length >= 17) {
2479                         /* Modify time. */
2480                         file->mtime = isodate17(data);
2481                         data += 17;
2482                         data_length -= 17;
2483                 }
2484                 if ((flag & 4) && data_length >= 17) {
2485                         /* Access time. */
2486                         file->atime = isodate17(data);
2487                         data += 17;
2488                         data_length -= 17;
2489                 }
2490                 if ((flag & 8) && data_length >= 17) {
2491                         /* Attribute change time. */
2492                         file->ctime = isodate17(data);
2493                 }
2494         } else {
2495                 /* Use 7-byte time format. */
2496                 if ((flag & 1) && data_length >= 7) {
2497                         /* Create time. */
2498                         file->birthtime_is_set = 1;
2499                         file->birthtime = isodate7(data);
2500                         data += 7;
2501                         data_length -= 7;
2502                 }
2503                 if ((flag & 2) && data_length >= 7) {
2504                         /* Modify time. */
2505                         file->mtime = isodate7(data);
2506                         data += 7;
2507                         data_length -= 7;
2508                 }
2509                 if ((flag & 4) && data_length >= 7) {
2510                         /* Access time. */
2511                         file->atime = isodate7(data);
2512                         data += 7;
2513                         data_length -= 7;
2514                 }
2515                 if ((flag & 8) && data_length >= 7) {
2516                         /* Attribute change time. */
2517                         file->ctime = isodate7(data);
2518                 }
2519         }
2520 }
2521
2522 static void
2523 parse_rockridge_SL1(struct file_info *file, const unsigned char *data,
2524     int data_length)
2525 {
2526         const char *separator = "";
2527
2528         if (!file->symlink_continues || file->symlink.length < 1)
2529                 archive_string_empty(&file->symlink);
2530         file->symlink_continues = 0;
2531
2532         /*
2533          * Defined flag values:
2534          *  0: This is the last SL record for this symbolic link
2535          *  1: this symbolic link field continues in next SL entry
2536          *  All other values are reserved.
2537          */
2538         if (data_length < 1)
2539                 return;
2540         switch(*data) {
2541         case 0:
2542                 break;
2543         case 1:
2544                 file->symlink_continues = 1;
2545                 break;
2546         default:
2547                 return;
2548         }
2549         ++data;  /* Skip flag byte. */
2550         --data_length;
2551
2552         /*
2553          * SL extension body stores "components".
2554          * Basically, this is a complicated way of storing
2555          * a POSIX path.  It also interferes with using
2556          * symlinks for storing non-path data. <sigh>
2557          *
2558          * Each component is 2 bytes (flag and length)
2559          * possibly followed by name data.
2560          */
2561         while (data_length >= 2) {
2562                 unsigned char flag = *data++;
2563                 unsigned char nlen = *data++;
2564                 data_length -= 2;
2565
2566                 archive_strcat(&file->symlink, separator);
2567                 separator = "/";
2568
2569                 switch(flag) {
2570                 case 0: /* Usual case, this is text. */
2571                         if (data_length < nlen)
2572                                 return;
2573                         archive_strncat(&file->symlink,
2574                             (const char *)data, nlen);
2575                         break;
2576                 case 0x01: /* Text continues in next component. */
2577                         if (data_length < nlen)
2578                                 return;
2579                         archive_strncat(&file->symlink,
2580                             (const char *)data, nlen);
2581                         separator = "";
2582                         break;
2583                 case 0x02: /* Current dir. */
2584                         archive_strcat(&file->symlink, ".");
2585                         break;
2586                 case 0x04: /* Parent dir. */
2587                         archive_strcat(&file->symlink, "..");
2588                         break;
2589                 case 0x08: /* Root of filesystem. */
2590                         archive_strcat(&file->symlink, "/");
2591                         separator = "";
2592                         break;
2593                 case 0x10: /* Undefined (historically "volume root" */
2594                         archive_string_empty(&file->symlink);
2595                         archive_strcat(&file->symlink, "ROOT");
2596                         break;
2597                 case 0x20: /* Undefined (historically "hostname") */
2598                         archive_strcat(&file->symlink, "hostname");
2599                         break;
2600                 default:
2601                         /* TODO: issue a warning ? */
2602                         return;
2603                 }
2604                 data += nlen;
2605                 data_length -= nlen;
2606         }
2607 }
2608
2609 static void
2610 parse_rockridge_ZF1(struct file_info *file, const unsigned char *data,
2611     int data_length)
2612 {
2613
2614         if (data[0] == 0x70 && data[1] == 0x7a && data_length == 12) {
2615                 /* paged zlib */
2616                 file->pz = 1;
2617                 file->pz_log2_bs = data[3];
2618                 file->pz_uncompressed_size = archive_le32dec(&data[4]);
2619         }
2620 }
2621
2622 static void
2623 register_file(struct iso9660 *iso9660, struct file_info *file)
2624 {
2625
2626         file->use_next = iso9660->use_files;
2627         iso9660->use_files = file;
2628 }
2629
2630 static void
2631 release_files(struct iso9660 *iso9660)
2632 {
2633         struct content *con, *connext;
2634         struct file_info *file;
2635
2636         file = iso9660->use_files;
2637         while (file != NULL) {
2638                 struct file_info *next = file->use_next;
2639
2640                 archive_string_free(&file->name);
2641                 archive_string_free(&file->symlink);
2642                 free(file->utf16be_name);
2643                 con = file->contents.first;
2644                 while (con != NULL) {
2645                         connext = con->next;
2646                         free(con);
2647                         con = connext;
2648                 }
2649                 free(file);
2650                 file = next;
2651         }
2652 }
2653
2654 static int
2655 next_entry_seek(struct archive_read *a, struct iso9660 *iso9660,
2656     struct file_info **pfile)
2657 {
2658         struct file_info *file;
2659         int r;
2660
2661         r = next_cache_entry(a, iso9660, pfile);
2662         if (r != ARCHIVE_OK)
2663                 return (r);
2664         file = *pfile;
2665
2666         /* Don't waste time seeking for zero-length bodies. */
2667         if (file->size == 0)
2668                 file->offset = iso9660->current_position;
2669
2670         /* flush any remaining bytes from the last round to ensure
2671          * we're positioned */
2672         if (iso9660->entry_bytes_unconsumed) {
2673                 __archive_read_consume(a, iso9660->entry_bytes_unconsumed);
2674                 iso9660->entry_bytes_unconsumed = 0;
2675         }
2676
2677         /* Seek forward to the start of the entry. */
2678         if (iso9660->current_position < file->offset) {
2679                 int64_t step;
2680
2681                 step = file->offset - iso9660->current_position;
2682                 step = __archive_read_consume(a, step);
2683                 if (step < 0)
2684                         return ((int)step);
2685                 iso9660->current_position = file->offset;
2686         }
2687
2688         /* We found body of file; handle it now. */
2689         return (ARCHIVE_OK);
2690 }
2691
2692 static int
2693 next_cache_entry(struct archive_read *a, struct iso9660 *iso9660,
2694     struct file_info **pfile)
2695 {
2696         struct file_info *file;
2697         struct {
2698                 struct file_info        *first;
2699                 struct file_info        **last;
2700         }       empty_files;
2701         int64_t number;
2702         int count;
2703
2704         file = cache_get_entry(iso9660);
2705         if (file != NULL) {
2706                 *pfile = file;
2707                 return (ARCHIVE_OK);
2708         }
2709
2710         for (;;) {
2711                 struct file_info *re, *d;
2712
2713                 *pfile = file = next_entry(iso9660);
2714                 if (file == NULL) {
2715                         /*
2716                          * If directory entries all which are descendant of
2717                          * rr_moved are stil remaning, expose their.
2718                          */
2719                         if (iso9660->re_files.first != NULL &&
2720                             iso9660->rr_moved != NULL &&
2721                             iso9660->rr_moved->rr_moved_has_re_only)
2722                                 /* Expose "rr_moved" entry. */
2723                                 cache_add_entry(iso9660, iso9660->rr_moved);
2724                         while ((re = re_get_entry(iso9660)) != NULL) {
2725                                 /* Expose its descendant dirs. */
2726                                 while ((d = rede_get_entry(re)) != NULL)
2727                                         cache_add_entry(iso9660, d);
2728                         }
2729                         if (iso9660->cache_files.first != NULL)
2730                                 return (next_cache_entry(a, iso9660, pfile));
2731                         return (ARCHIVE_EOF);
2732                 }
2733
2734                 if (file->cl_offset) {
2735                         struct file_info *first_re = NULL;
2736                         int nexted_re = 0;
2737
2738                         /*
2739                          * Find "RE" dir for the current file, which
2740                          * has "CL" flag.
2741                          */
2742                         while ((re = re_get_entry(iso9660))
2743                             != first_re) {
2744                                 if (first_re == NULL)
2745                                         first_re = re;
2746                                 if (re->offset == file->cl_offset) {
2747                                         re->parent->subdirs--;
2748                                         re->parent = file->parent;
2749                                         re->re = 0;
2750                                         if (re->parent->re_descendant) {
2751                                                 nexted_re = 1;
2752                                                 re->re_descendant = 1;
2753                                                 if (rede_add_entry(re) < 0)
2754                                                         goto fatal_rr;
2755                                                 /* Move a list of descendants
2756                                                  * to a new ancestor. */
2757                                                 while ((d = rede_get_entry(
2758                                                     re)) != NULL)
2759                                                         if (rede_add_entry(d)
2760                                                             < 0)
2761                                                                 goto fatal_rr;
2762                                                 break;
2763                                         }
2764                                         /* Replace the current file
2765                                          * with "RE" dir */
2766                                         *pfile = file = re;
2767                                         /* Expose its descendant */
2768                                         while ((d = rede_get_entry(
2769                                             file)) != NULL)
2770                                                 cache_add_entry(
2771                                                     iso9660, d);
2772                                         break;
2773                                 } else
2774                                         re_add_entry(iso9660, re);
2775                         }
2776                         if (nexted_re) {
2777                                 /*
2778                                  * Do not expose this at this time
2779                                  * because we have not gotten its full-path
2780                                  * name yet.
2781                                  */
2782                                 continue;
2783                         }
2784                 } else if ((file->mode & AE_IFMT) == AE_IFDIR) {
2785                         int r;
2786
2787                         /* Read file entries in this dir. */
2788                         r = read_children(a, file);
2789                         if (r != ARCHIVE_OK)
2790                                 return (r);
2791
2792                         /*
2793                          * Handle a special dir of Rockridge extensions,
2794                          * "rr_moved".
2795                          */
2796                         if (file->rr_moved) {
2797                                 /*
2798                                  * If this has only the subdirectories which
2799                                  * have "RE" flags, do not expose at this time.
2800                                  */
2801                                 if (file->rr_moved_has_re_only)
2802                                         continue;
2803                                 /* Otherwise expose "rr_moved" entry. */
2804                         } else if (file->re) {
2805                                 /*
2806                                  * Do not expose this at this time
2807                                  * because we have not gotten its full-path
2808                                  * name yet.
2809                                  */
2810                                 re_add_entry(iso9660, file);
2811                                 continue;
2812                         } else if (file->re_descendant) {
2813                                 /*
2814                                  * If the top level "RE" entry of this entry
2815                                  * is not exposed, we, accordingly, should not
2816                                  * expose this entry at this time because
2817                                  * we cannot make its proper full-path name.
2818                                  */
2819                                 if (rede_add_entry(file) == 0)
2820                                         continue;
2821                                 /* Otherwise we can expose this entry because
2822                                  * it seems its top level "RE" has already been
2823                                  * exposed. */
2824                         }
2825                 }
2826                 break;
2827         }
2828
2829         if ((file->mode & AE_IFMT) != AE_IFREG || file->number == -1)
2830                 return (ARCHIVE_OK);
2831
2832         count = 0;
2833         number = file->number;
2834         iso9660->cache_files.first = NULL;
2835         iso9660->cache_files.last = &(iso9660->cache_files.first);
2836         empty_files.first = NULL;
2837         empty_files.last = &empty_files.first;
2838         /* Collect files which has the same file serial number.
2839          * Peek pending_files so that file which number is different
2840          * is not put bak. */
2841         while (iso9660->pending_files.used > 0 &&
2842             (iso9660->pending_files.files[0]->number == -1 ||
2843              iso9660->pending_files.files[0]->number == number)) {
2844                 if (file->number == -1) {
2845                         /* This file has the same offset
2846                          * but it's wrong offset which empty files
2847                          * and symlink files have.
2848                          * NOTE: This wrong offse was recorded by
2849                          * old mkisofs utility. If ISO images is
2850                          * created by latest mkisofs, this does not
2851                          * happen.
2852                          */
2853                         file->next = NULL;
2854                         *empty_files.last = file;
2855                         empty_files.last = &(file->next);
2856                 } else {
2857                         count++;
2858                         cache_add_entry(iso9660, file);
2859                 }
2860                 file = next_entry(iso9660);
2861         }
2862
2863         if (count == 0) {
2864                 *pfile = file;
2865                 return ((file == NULL)?ARCHIVE_EOF:ARCHIVE_OK);
2866         }
2867         if (file->number == -1) {
2868                 file->next = NULL;
2869                 *empty_files.last = file;
2870                 empty_files.last = &(file->next);
2871         } else {
2872                 count++;
2873                 cache_add_entry(iso9660, file);
2874         }
2875
2876         if (count > 1) {
2877                 /* The count is the same as number of hardlink,
2878                  * so much so that each nlinks of files in cache_file
2879                  * is overwritten by value of the count.
2880                  */
2881                 for (file = iso9660->cache_files.first;
2882                     file != NULL; file = file->next)
2883                         file->nlinks = count;
2884         }
2885         /* If there are empty files, that files are added
2886          * to the tail of the cache_files. */
2887         if (empty_files.first != NULL) {
2888                 *iso9660->cache_files.last = empty_files.first;
2889                 iso9660->cache_files.last = empty_files.last;
2890         }
2891         *pfile = cache_get_entry(iso9660);
2892         return ((*pfile == NULL)?ARCHIVE_EOF:ARCHIVE_OK);
2893
2894 fatal_rr:
2895         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2896             "Failed to connect 'CL' pointer to 'RE' rr_moved pointer of"
2897             "Rockridge extensions");
2898         return (ARCHIVE_FATAL);
2899 }
2900
2901 static inline void
2902 re_add_entry(struct iso9660 *iso9660, struct file_info *file)
2903 {
2904         file->re_next = NULL;
2905         *iso9660->re_files.last = file;
2906         iso9660->re_files.last = &(file->re_next);
2907 }
2908
2909 static inline struct file_info *
2910 re_get_entry(struct iso9660 *iso9660)
2911 {
2912         struct file_info *file;
2913
2914         if ((file = iso9660->re_files.first) != NULL) {
2915                 iso9660->re_files.first = file->re_next;
2916                 if (iso9660->re_files.first == NULL)
2917                         iso9660->re_files.last =
2918                             &(iso9660->re_files.first);
2919         }
2920         return (file);
2921 }
2922
2923 static inline int
2924 rede_add_entry(struct file_info *file)
2925 {
2926         struct file_info *re;
2927
2928         /*
2929          * Find "RE" entry.
2930          */
2931         re = file->parent;
2932         while (re != NULL && !re->re)
2933                 re = re->parent;
2934         if (re == NULL)
2935                 return (-1);
2936
2937         file->re_next = NULL;
2938         *re->rede_files.last = file;
2939         re->rede_files.last = &(file->re_next);
2940         return (0);
2941 }
2942
2943 static inline struct file_info *
2944 rede_get_entry(struct file_info *re)
2945 {
2946         struct file_info *file;
2947
2948         if ((file = re->rede_files.first) != NULL) {
2949                 re->rede_files.first = file->re_next;
2950                 if (re->rede_files.first == NULL)
2951                         re->rede_files.last =
2952                             &(re->rede_files.first);
2953         }
2954         return (file);
2955 }
2956
2957 static inline void
2958 cache_add_entry(struct iso9660 *iso9660, struct file_info *file)
2959 {
2960         file->next = NULL;
2961         *iso9660->cache_files.last = file;
2962         iso9660->cache_files.last = &(file->next);
2963 }
2964
2965 static inline struct file_info *
2966 cache_get_entry(struct iso9660 *iso9660)
2967 {
2968         struct file_info *file;
2969
2970         if ((file = iso9660->cache_files.first) != NULL) {
2971                 iso9660->cache_files.first = file->next;
2972                 if (iso9660->cache_files.first == NULL)
2973                         iso9660->cache_files.last =
2974                             &(iso9660->cache_files.first);
2975         }
2976         return (file);
2977 }
2978
2979 static int
2980 heap_add_entry(struct archive_read *a, struct heap_queue *heap,
2981     struct file_info *file, uint64_t key)
2982 {
2983         uint64_t file_key, parent_key;
2984         int hole, parent;
2985
2986         /* Expand our pending files list as necessary. */
2987         if (heap->used >= heap->allocated) {
2988                 struct file_info **new_pending_files;
2989                 int new_size = heap->allocated * 2;
2990
2991                 if (heap->allocated < 1024)
2992                         new_size = 1024;
2993                 /* Overflow might keep us from growing the list. */
2994                 if (new_size <= heap->allocated) {
2995                         archive_set_error(&a->archive,
2996                             ENOMEM, "Out of memory");
2997                         return (ARCHIVE_FATAL);
2998                 }
2999                 new_pending_files = (struct file_info **)
3000                     malloc(new_size * sizeof(new_pending_files[0]));
3001                 if (new_pending_files == NULL) {
3002                         archive_set_error(&a->archive,
3003                             ENOMEM, "Out of memory");
3004                         return (ARCHIVE_FATAL);
3005                 }
3006                 memcpy(new_pending_files, heap->files,
3007                     heap->allocated * sizeof(new_pending_files[0]));
3008                 if (heap->files != NULL)
3009                         free(heap->files);
3010                 heap->files = new_pending_files;
3011                 heap->allocated = new_size;
3012         }
3013
3014         file_key = file->key = key;
3015
3016         /*
3017          * Start with hole at end, walk it up tree to find insertion point.
3018          */
3019         hole = heap->used++;
3020         while (hole > 0) {
3021                 parent = (hole - 1)/2;
3022                 parent_key = heap->files[parent]->key;
3023                 if (file_key >= parent_key) {
3024                         heap->files[hole] = file;
3025                         return (ARCHIVE_OK);
3026                 }
3027                 /* Move parent into hole <==> move hole up tree. */
3028                 heap->files[hole] = heap->files[parent];
3029                 hole = parent;
3030         }
3031         heap->files[0] = file;
3032
3033         return (ARCHIVE_OK);
3034 }
3035
3036 static struct file_info *
3037 heap_get_entry(struct heap_queue *heap)
3038 {
3039         uint64_t a_key, b_key, c_key;
3040         int a, b, c;
3041         struct file_info *r, *tmp;
3042
3043         if (heap->used < 1)
3044                 return (NULL);
3045
3046         /*
3047          * The first file in the list is the earliest; we'll return this.
3048          */
3049         r = heap->files[0];
3050
3051         /*
3052          * Move the last item in the heap to the root of the tree
3053          */
3054         heap->files[0] = heap->files[--(heap->used)];
3055
3056         /*
3057          * Rebalance the heap.
3058          */
3059         a = 0; /* Starting element and its heap key */
3060         a_key = heap->files[a]->key;
3061         for (;;) {
3062                 b = a + a + 1; /* First child */
3063                 if (b >= heap->used)
3064                         return (r);
3065                 b_key = heap->files[b]->key;
3066                 c = b + 1; /* Use second child if it is smaller. */
3067                 if (c < heap->used) {
3068                         c_key = heap->files[c]->key;
3069                         if (c_key < b_key) {
3070                                 b = c;
3071                                 b_key = c_key;
3072                         }
3073                 }
3074                 if (a_key <= b_key)
3075                         return (r);
3076                 tmp = heap->files[a];
3077                 heap->files[a] = heap->files[b];
3078                 heap->files[b] = tmp;
3079                 a = b;
3080         }
3081 }
3082
3083 static unsigned int
3084 toi(const void *p, int n)
3085 {
3086         const unsigned char *v = (const unsigned char *)p;
3087         if (n > 1)
3088                 return v[0] + 256 * toi(v + 1, n - 1);
3089         if (n == 1)
3090                 return v[0];
3091         return (0);
3092 }
3093
3094 static time_t
3095 isodate7(const unsigned char *v)
3096 {
3097         struct tm tm;
3098         int offset;
3099         time_t t;
3100
3101         memset(&tm, 0, sizeof(tm));
3102         tm.tm_year = v[0];
3103         tm.tm_mon = v[1] - 1;
3104         tm.tm_mday = v[2];
3105         tm.tm_hour = v[3];
3106         tm.tm_min = v[4];
3107         tm.tm_sec = v[5];
3108         /* v[6] is the signed timezone offset, in 1/4-hour increments. */
3109         offset = ((const signed char *)v)[6];
3110         if (offset > -48 && offset < 52) {
3111                 tm.tm_hour -= offset / 4;
3112                 tm.tm_min -= (offset % 4) * 15;
3113         }
3114         t = time_from_tm(&tm);
3115         if (t == (time_t)-1)
3116                 return ((time_t)0);
3117         return (t);
3118 }
3119
3120 static time_t
3121 isodate17(const unsigned char *v)
3122 {
3123         struct tm tm;
3124         int offset;
3125         time_t t;
3126
3127         memset(&tm, 0, sizeof(tm));
3128         tm.tm_year = (v[0] - '0') * 1000 + (v[1] - '0') * 100
3129             + (v[2] - '0') * 10 + (v[3] - '0')
3130             - 1900;
3131         tm.tm_mon = (v[4] - '0') * 10 + (v[5] - '0');
3132         tm.tm_mday = (v[6] - '0') * 10 + (v[7] - '0');
3133         tm.tm_hour = (v[8] - '0') * 10 + (v[9] - '0');
3134         tm.tm_min = (v[10] - '0') * 10 + (v[11] - '0');
3135         tm.tm_sec = (v[12] - '0') * 10 + (v[13] - '0');
3136         /* v[16] is the signed timezone offset, in 1/4-hour increments. */
3137         offset = ((const signed char *)v)[16];
3138         if (offset > -48 && offset < 52) {
3139                 tm.tm_hour -= offset / 4;
3140                 tm.tm_min -= (offset % 4) * 15;
3141         }
3142         t = time_from_tm(&tm);
3143         if (t == (time_t)-1)
3144                 return ((time_t)0);
3145         return (t);
3146 }
3147
3148 static time_t
3149 time_from_tm(struct tm *t)
3150 {
3151 #if HAVE_TIMEGM
3152         /* Use platform timegm() if available. */
3153         return (timegm(t));
3154 #elif HAVE__MKGMTIME64
3155         return (_mkgmtime64(t));
3156 #else
3157         /* Else use direct calculation using POSIX assumptions. */
3158         /* First, fix up tm_yday based on the year/month/day. */
3159         if (mktime(t) == (time_t)-1)
3160                 return ((time_t)-1);
3161         /* Then we can compute timegm() from first principles. */
3162         return (t->tm_sec + t->tm_min * 60 + t->tm_hour * 3600
3163             + t->tm_yday * 86400 + (t->tm_year - 70) * 31536000
3164             + ((t->tm_year - 69) / 4) * 86400 -
3165             ((t->tm_year - 1) / 100) * 86400
3166             + ((t->tm_year + 299) / 400) * 86400);
3167 #endif
3168 }
3169
3170 static const char *
3171 build_pathname(struct archive_string *as, struct file_info *file)
3172 {
3173         if (file->parent != NULL && archive_strlen(&file->parent->name) > 0) {
3174                 build_pathname(as, file->parent);
3175                 archive_strcat(as, "/");
3176         }
3177         if (archive_strlen(&file->name) == 0)
3178                 archive_strcat(as, ".");
3179         else
3180                 archive_string_concat(as, &file->name);
3181         return (as->s);
3182 }
3183
3184 static int
3185 build_pathname_utf16be(unsigned char *p, size_t max, size_t *len,
3186     struct file_info *file)
3187 {
3188         if (file->parent != NULL && file->parent->utf16be_bytes > 0) {
3189                 if (build_pathname_utf16be(p, max, len, file->parent) != 0)
3190                         return (-1);
3191                 p[*len] = 0;
3192                 p[*len + 1] = '/';
3193                 *len += 2;
3194         }
3195         if (file->utf16be_bytes == 0) {
3196                 if (*len + 2 > max)
3197                         return (-1);/* Path is too long! */
3198                 p[*len] = 0;
3199                 p[*len + 1] = '.';
3200                 *len += 2;
3201         } else {
3202                 if (*len + file->utf16be_bytes > max)
3203                         return (-1);/* Path is too long! */
3204                 memcpy(p + *len, file->utf16be_name, file->utf16be_bytes);
3205                 *len += file->utf16be_bytes;
3206         }
3207         return (0);
3208 }
3209
3210 #if DEBUG
3211 static void
3212 dump_isodirrec(FILE *out, const unsigned char *isodirrec)
3213 {
3214         fprintf(out, " l %d,",
3215             toi(isodirrec + DR_length_offset, DR_length_size));
3216         fprintf(out, " a %d,",
3217             toi(isodirrec + DR_ext_attr_length_offset, DR_ext_attr_length_size));
3218         fprintf(out, " ext 0x%x,",
3219             toi(isodirrec + DR_extent_offset, DR_extent_size));
3220         fprintf(out, " s %d,",
3221             toi(isodirrec + DR_size_offset, DR_extent_size));
3222         fprintf(out, " f 0x%x,",
3223             toi(isodirrec + DR_flags_offset, DR_flags_size));
3224         fprintf(out, " u %d,",
3225             toi(isodirrec + DR_file_unit_size_offset, DR_file_unit_size_size));
3226         fprintf(out, " ilv %d,",
3227             toi(isodirrec + DR_interleave_offset, DR_interleave_size));
3228         fprintf(out, " seq %d,",
3229             toi(isodirrec + DR_volume_sequence_number_offset, DR_volume_sequence_number_size));
3230         fprintf(out, " nl %d:",
3231             toi(isodirrec + DR_name_len_offset, DR_name_len_size));
3232         fprintf(out, " `%.*s'",
3233             toi(isodirrec + DR_name_len_offset, DR_name_len_size), isodirrec + DR_name_offset);
3234 }
3235 #endif