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_private.h"
  51 #include "archive_read_private.h"
  52 #include "archive_string.h"
  53
  54 /*
  55  * An overview of ISO 9660 format:
  56  *
  57  * Each disk is laid out as follows:
  58  *   * 32k reserved for private use
  59  *   * Volume descriptor table.  Each volume descriptor
  60  *     is 2k and specifies basic format information.
  61  *     The "Primary Volume Descriptor" (PVD) is defined by the
  62  *     standard and should always be present; other volume
  63  *     descriptors include various vendor-specific extensions.
  64  *   * Files and directories.  Each file/dir is specified by
  65  *     an "extent" (starting sector and length in bytes).
  66  *     Dirs are just files with directory records packed one
  67  *     after another.  The PVD contains a single dir entry
  68  *     specifying the location of the root directory.  Everything
  69  *     else follows from there.
  70  *
  71  * This module works by first reading the volume descriptors, then
  72  * building a list of directory entries, sorted by starting
  73  * sector.  At each step, I look for the earliest dir entry that
  74  * hasn't yet been read, seek forward to that location and read
  75  * that entry.  If it's a dir, I slurp in the new dir entries and
  76  * add them to the heap; if it's a regular file, I return the
  77  * corresponding archive_entry and wait for the client to request
  78  * the file body.  This strategy allows us to read most compliant
  79  * CDs with a single pass through the data, as required by libarchive.
  80  */
  81 #define LOGICAL_BLOCK_SIZE      2048
  82 #define SYSTEM_AREA_BLOCK       16
  83
  84 /* Structure of on-disk primary volume descriptor. */
  85 #define PVD_type_offset 0
  86 #define PVD_type_size 1
  87 #define PVD_id_offset (PVD_type_offset + PVD_type_size)
  88 #define PVD_id_size 5
  89 #define PVD_version_offset (PVD_id_offset + PVD_id_size)
  90 #define PVD_version_size 1
  91 #define PVD_reserved1_offset (PVD_version_offset + PVD_version_size)
  92 #define PVD_reserved1_size 1
  93 #define PVD_system_id_offset (PVD_reserved1_offset + PVD_reserved1_size)
  94 #define PVD_system_id_size 32
  95 #define PVD_volume_id_offset (PVD_system_id_offset + PVD_system_id_size)
  96 #define PVD_volume_id_size 32
  97 #define PVD_reserved2_offset (PVD_volume_id_offset + PVD_volume_id_size)
  98 #define PVD_reserved2_size 8
  99 #define PVD_volume_space_size_offset (PVD_reserved2_offset + PVD_reserved2_size)
 100 #define PVD_volume_space_size_size 8
 101 #define PVD_reserved3_offset (PVD_volume_space_size_offset + PVD_volume_space_size_size)
 102 #define PVD_reserved3_size 32
 103 #define PVD_volume_set_size_offset (PVD_reserved3_offset + PVD_reserved3_size)
 104 #define PVD_volume_set_size_size 4
 105 #define PVD_volume_sequence_number_offset (PVD_volume_set_size_offset + PVD_volume_set_size_size)
 106 #define PVD_volume_sequence_number_size 4
 107 #define PVD_logical_block_size_offset (PVD_volume_sequence_number_offset + PVD_volume_sequence_number_size)
 108 #define PVD_logical_block_size_size 4
 109 #define PVD_path_table_size_offset (PVD_logical_block_size_offset + PVD_logical_block_size_size)
 110 #define PVD_path_table_size_size 8
 111 #define PVD_type_1_path_table_offset (PVD_path_table_size_offset + PVD_path_table_size_size)
 112 #define PVD_type_1_path_table_size 4
 113 #define PVD_opt_type_1_path_table_offset (PVD_type_1_path_table_offset + PVD_type_1_path_table_size)
 114 #define PVD_opt_type_1_path_table_size 4
 115 #define PVD_type_m_path_table_offset (PVD_opt_type_1_path_table_offset + PVD_opt_type_1_path_table_size)
 116 #define PVD_type_m_path_table_size 4
 117 #define PVD_opt_type_m_path_table_offset (PVD_type_m_path_table_offset + PVD_type_m_path_table_size)
 118 #define PVD_opt_type_m_path_table_size 4
 119 #define PVD_root_directory_record_offset (PVD_opt_type_m_path_table_offset + PVD_opt_type_m_path_table_size)
 120 #define PVD_root_directory_record_size 34
 121 #define PVD_volume_set_id_offset (PVD_root_directory_record_offset + PVD_root_directory_record_size)
 122 #define PVD_volume_set_id_size 128
 123 #define PVD_publisher_id_offset (PVD_volume_set_id_offset + PVD_volume_set_id_size)
 124 #define PVD_publisher_id_size 128
 125 #define PVD_preparer_id_offset (PVD_publisher_id_offset + PVD_publisher_id_size)
 126 #define PVD_preparer_id_size 128
 127 #define PVD_application_id_offset (PVD_preparer_id_offset + PVD_preparer_id_size)
 128 #define PVD_application_id_size 128
 129 #define PVD_copyright_file_id_offset (PVD_application_id_offset + PVD_application_id_size)
 130 #define PVD_copyright_file_id_size 37
 131 #define PVD_abstract_file_id_offset (PVD_copyright_file_id_offset + PVD_copyright_file_id_size)
 132 #define PVD_abstract_file_id_size 37
 133 #define PVD_bibliographic_file_id_offset (PVD_abstract_file_id_offset + PVD_abstract_file_id_size)
 134 #define PVD_bibliographic_file_id_size 37
 135 #define PVD_creation_date_offset (PVD_bibliographic_file_id_offset + PVD_bibliographic_file_id_size)
 136 #define PVD_creation_date_size 17
 137 #define PVD_modification_date_offset (PVD_creation_date_offset + PVD_creation_date_size)
 138 #define PVD_modification_date_size 17
 139 #define PVD_expiration_date_offset (PVD_modification_date_offset + PVD_modification_date_size)
 140 #define PVD_expiration_date_size 17
 141 #define PVD_effective_date_offset (PVD_expiration_date_offset + PVD_expiration_date_size)
 142 #define PVD_effective_date_size 17
 143 #define PVD_file_structure_version_offset (PVD_effective_date_offset + PVD_effective_date_size)
 144 #define PVD_file_structure_version_size 1
 145 #define PVD_reserved4_offset (PVD_file_structure_version_offset + PVD_file_structure_version_size)
 146 #define PVD_reserved4_size 1
 147 #define PVD_application_data_offset (PVD_reserved4_offset + PVD_reserved4_size)
 148 #define PVD_application_data_size 512
 149 #define PVD_reserved5_offset (PVD_application_data_offset + PVD_application_data_size)
 150 #define PVD_reserved5_size (2048 - PVD_reserved5_offset)
 151
 152 /* TODO: It would make future maintenance easier to just hardcode the
 153  * above values.  In particular, ECMA119 states the offsets as part of
 154  * the standard.  That would eliminate the need for the following check.*/
 155 #if PVD_reserved5_offset != 1395
 156 #error PVD offset and size definitions are wrong.
 157 #endif
 158
 159
 160 /* Structure of optional on-disk supplementary volume descriptor. */
 161 #define SVD_type_offset 0
 162 #define SVD_type_size 1
 163 #define SVD_id_offset (SVD_type_offset + SVD_type_size)
 164 #define SVD_id_size 5
 165 #define SVD_version_offset (SVD_id_offset + SVD_id_size)
 166 #define SVD_version_size 1
 167 /* ... */
 168 #define SVD_reserved1_offset    72
 169 #define SVD_reserved1_size      8
 170 #define SVD_volume_space_size_offset 80
 171 #define SVD_volume_space_size_size 8
 172 #define SVD_escape_sequences_offset (SVD_volume_space_size_offset + SVD_volume_space_size_size)
 173 #define SVD_escape_sequences_size 32
 174 /* ... */
 175 #define SVD_logical_block_size_offset 128
 176 #define SVD_logical_block_size_size 4
 177 #define SVD_type_L_path_table_offset 140
 178 #define SVD_type_M_path_table_offset 148
 179 /* ... */
 180 #define SVD_root_directory_record_offset 156
 181 #define SVD_root_directory_record_size 34
 182 #define SVD_file_structure_version_offset 881
 183 #define SVD_reserved2_offset    882
 184 #define SVD_reserved2_size      1
 185 #define SVD_reserved3_offset    1395
 186 #define SVD_reserved3_size      653
 187 /* ... */
 188 /* FIXME: validate correctness of last SVD entry offset. */
 189
 190 /* Structure of an on-disk directory record. */
 191 /* Note:  ISO9660 stores each multi-byte integer twice, once in
 192  * each byte order.  The sizes here are the size of just one
 193  * of the two integers.  (This is why the offset of a field isn't
 194  * the same as the offset+size of the previous field.) */
 195 #define DR_length_offset 0
 196 #define DR_length_size 1
 197 #define DR_ext_attr_length_offset 1
 198 #define DR_ext_attr_length_size 1
 199 #define DR_extent_offset 2
 200 #define DR_extent_size 4
 201 #define DR_size_offset 10
 202 #define DR_size_size 4
 203 #define DR_date_offset 18
 204 #define DR_date_size 7
 205 #define DR_flags_offset 25
 206 #define DR_flags_size 1
 207 #define DR_file_unit_size_offset 26
 208 #define DR_file_unit_size_size 1
 209 #define DR_interleave_offset 27
 210 #define DR_interleave_size 1
 211 #define DR_volume_sequence_number_offset 28
 212 #define DR_volume_sequence_number_size 2
 213 #define DR_name_len_offset 32
 214 #define DR_name_len_size 1
 215 #define DR_name_offset 33
 216
 217 #ifdef HAVE_ZLIB_H
 218 static const unsigned char zisofs_magic[8] = {
 219         0x37, 0xE4, 0x53, 0x96, 0xC9, 0xDB, 0xD6, 0x07
 220 };
 221
 222 struct zisofs {
 223         /* Set 1 if this file compressed by paged zlib */
 224         int              pz;
 225         int              pz_log2_bs; /* Log2 of block size */
 226         uint64_t         pz_uncompressed_size;
 227
 228         int              initialized;
 229         unsigned char   *uncompressed_buffer;
 230         size_t           uncompressed_buffer_size;
 231
 232         uint32_t         pz_offset;
 233         unsigned char    header[16];
 234         size_t           header_avail;
 235         int              header_passed;
 236         unsigned char   *block_pointers;
 237         size_t           block_pointers_alloc;
 238         size_t           block_pointers_size;
 239         size_t           block_pointers_avail;
 240         size_t           block_off;
 241         uint32_t         block_avail;
 242
 243         z_stream         stream;
 244         int              stream_valid;
 245 };
 246 #else
 247 struct zisofs {
 248         /* Set 1 if this file compressed by paged zlib */
 249         int              pz;
 250 };
 251 #endif
 252
 253 struct content {
 254         uint64_t         offset;/* Offset on disk.              */
 255         uint64_t         size;  /* File size in bytes.          */
 256         struct content  *next;
 257 };
 258
 259 /* In-memory storage for a directory record. */
 260 struct file_info {
 261         struct file_info        *use_next;
 262         struct file_info        *parent;
 263         struct file_info        *next;
 264         struct file_info        *re_next;
 265         int              subdirs;
 266         uint64_t         key;           /* Heap Key.                    */
 267         uint64_t         offset;        /* Offset on disk.              */
 268         uint64_t         size;          /* File size in bytes.          */
 269         uint32_t         ce_offset;     /* Offset of CE.                */
 270         uint32_t         ce_size;       /* Size of CE.                  */
 271         char             rr_moved;      /* Flag to rr_moved.            */
 272         char             rr_moved_has_re_only;
 273         char             re;            /* Having RRIP "RE" extension.  */
 274         char             re_descendant;
 275         uint64_t         cl_offset;     /* Having RRIP "CL" extension.  */
 276         int              birthtime_is_set;
 277         time_t           birthtime;     /* File created time.           */
 278         time_t           mtime;         /* File last modified time.     */
 279         time_t           atime;         /* File last accessed time.     */
 280         time_t           ctime;         /* File attribute change time.  */
 281         uint64_t         rdev;          /* Device number.               */
 282         mode_t           mode;
 283         uid_t            uid;
 284         gid_t            gid;
 285         int64_t          number;
 286         int              nlinks;
 287         struct archive_string name; /* Pathname */
 288         char             name_continues; /* Non-zero if name continues */
 289         struct archive_string symlink;
 290         char             symlink_continues; /* Non-zero if link continues */
 291         /* Set 1 if this file compressed by paged zlib(zisofs) */
 292         int              pz;
 293         int              pz_log2_bs; /* Log2 of block size */
 294         uint64_t         pz_uncompressed_size;
 295         /* Set 1 if this file is multi extent. */
 296         int              multi_extent;
 297         struct {
 298                 struct content  *first;
 299                 struct content  **last;
 300         } contents;
 301         struct {
 302                 struct file_info        *first;
 303                 struct file_info        **last;
 304         } rede_files;
 305 };
 306
 307 struct heap_queue {
 308         struct file_info **files;
 309         int              allocated;
 310         int              used;
 311 };
 312
 313 struct iso9660 {
 314         int     magic;
 315 #define ISO9660_MAGIC   0x96609660
 316
 317         int opt_support_joliet;
 318         int opt_support_rockridge;
 319
 320         struct archive_string pathname;
 321         char    seenRockridge;  /* Set true if RR extensions are used. */
 322         char    seenSUSP;       /* Set true if SUSP is beging used. */
 323         char    seenJoliet;
 324
 325         unsigned char   suspOffset;
 326         struct file_info *rr_moved;
 327         struct read_ce_queue {
 328                 struct read_ce_req {
 329                         uint64_t         offset;/* Offset of CE on disk. */
 330                         struct file_info *file;
 331                 }               *reqs;
 332                 int              cnt;
 333                 int              allocated;
 334         }       read_ce_req;
 335
 336         int64_t         previous_number;
 337         struct archive_string previous_pathname;
 338
 339         struct file_info                *use_files;
 340         struct heap_queue                pending_files;
 341         struct {
 342                 struct file_info        *first;
 343                 struct file_info        **last;
 344         }       cache_files;
 345         struct {
 346                 struct file_info        *first;
 347                 struct file_info        **last;
 348         }       re_files;
 349
 350         uint64_t current_position;
 351         ssize_t logical_block_size;
 352         uint64_t volume_size; /* Total size of volume in bytes. */
 353         int32_t  volume_block;/* Total size of volume in logical blocks. */
 354
 355         struct vd {
 356                 int             location;       /* Location of Extent.  */
 357                 uint32_t        size;
 358         } primary, joliet;
 359
 360         off_t   entry_sparse_offset;
 361         int64_t entry_bytes_remaining;
 362         struct zisofs    entry_zisofs;
 363         struct content  *entry_content;
 364 };
 365
 366 static int      archive_read_format_iso9660_bid(struct archive_read *);
 367 static int      archive_read_format_iso9660_options(struct archive_read *,
 368                     const char *, const char *);
 369 static int      archive_read_format_iso9660_cleanup(struct archive_read *);
 370 static int      archive_read_format_iso9660_read_data(struct archive_read *,
 371                     const void **, size_t *, off_t *);
 372 static int      archive_read_format_iso9660_read_data_skip(struct archive_read *);
 373 static int      archive_read_format_iso9660_read_header(struct archive_read *,
 374                     struct archive_entry *);
 375 static const char *build_pathname(struct archive_string *, struct file_info *);
 376 #if DEBUG
 377 static void     dump_isodirrec(FILE *, const unsigned char *isodirrec);
 378 #endif
 379 static time_t   time_from_tm(struct tm *);
 380 static time_t   isodate17(const unsigned char *);
 381 static time_t   isodate7(const unsigned char *);
 382 static int      isBootRecord(struct iso9660 *, const unsigned char *);
 383 static int      isVolumePartition(struct iso9660 *, const unsigned char *);
 384 static int      isVDSetTerminator(struct iso9660 *, const unsigned char *);
 385 static int      isJolietSVD(struct iso9660 *, const unsigned char *);
 386 static int      isSVD(struct iso9660 *, const unsigned char *);
 387 static int      isEVD(struct iso9660 *, const unsigned char *);
 388 static int      isPVD(struct iso9660 *, const unsigned char *);
 389 static int      next_cache_entry(struct archive_read *, struct iso9660 *,
 390                     struct file_info **);
 391 static int      next_entry_seek(struct archive_read *a, struct iso9660 *iso9660,
 392                     struct file_info **pfile);
 393 static struct file_info *
 394                 parse_file_info(struct archive_read *a,
 395                     struct file_info *parent, const unsigned char *isodirrec);
 396 static int      parse_rockridge(struct archive_read *a,
 397                     struct file_info *file, const unsigned char *start,
 398                     const unsigned char *end);
 399 static int      register_CE(struct archive_read *a, int32_t location,
 400                     struct file_info *file);
 401 static int      read_CE(struct archive_read *a, struct iso9660 *iso9660);
 402 static void     parse_rockridge_NM1(struct file_info *,
 403                     const unsigned char *, int);
 404 static void     parse_rockridge_SL1(struct file_info *,
 405                     const unsigned char *, int);
 406 static void     parse_rockridge_TF1(struct file_info *,
 407                     const unsigned char *, int);
 408 static void     parse_rockridge_ZF1(struct file_info *,
 409                     const unsigned char *, int);
 410 static void     register_file(struct iso9660 *, struct file_info *);
 411 static void     release_files(struct iso9660 *);
 412 static unsigned toi(const void *p, int n);
 413 static inline void re_add_entry(struct iso9660 *, struct file_info *);
 414 static inline struct file_info * re_get_entry(struct iso9660 *);
 415 static inline int rede_add_entry(struct file_info *);
 416 static inline struct file_info * rede_get_entry(struct file_info *);
 417 static inline void cache_add_entry(struct iso9660 *iso9660,
 418                     struct file_info *file);
 419 static inline struct file_info *cache_get_entry(struct iso9660 *iso9660);
 420 static void     heap_add_entry(struct heap_queue *heap,
 421                     struct file_info *file, uint64_t key);
 422 static struct file_info *heap_get_entry(struct heap_queue *heap);
 423
 424 #define add_entry(iso9660, file)        \
 425         heap_add_entry(&((iso9660)->pending_files), file, file->offset)
 426 #define next_entry(iso9660)             \
 427         heap_get_entry(&((iso9660)->pending_files))
 428
 429 int
 430 archive_read_support_format_iso9660(struct archive *_a)
 431 {
 432         struct archive_read *a = (struct archive_read *)_a;
 433         struct iso9660 *iso9660;
 434         int r;
 435
 436         iso9660 = (struct iso9660 *)malloc(sizeof(*iso9660));
 437         if (iso9660 == NULL) {
 438                 archive_set_error(&a->archive, ENOMEM, "Can't allocate iso9660 data");
 439                 return (ARCHIVE_FATAL);
 440         }
 441         memset(iso9660, 0, sizeof(*iso9660));
 442         iso9660->magic = ISO9660_MAGIC;
 443         iso9660->cache_files.first = NULL;
 444         iso9660->cache_files.last = &(iso9660->cache_files.first);
 445         iso9660->re_files.first = NULL;
 446         iso9660->re_files.last = &(iso9660->re_files.first);
 447         /* Enable to support Joliet extensions by default.      */
 448         iso9660->opt_support_joliet = 1;
 449         /* Enable to support Rock Ridge extensions by default.  */
 450         iso9660->opt_support_rockridge = 1;
 451
 452         r = __archive_read_register_format(a,
 453             iso9660,
 454             "iso9660",
 455             archive_read_format_iso9660_bid,
 456             archive_read_format_iso9660_options,
 457             archive_read_format_iso9660_read_header,
 458             archive_read_format_iso9660_read_data,
 459             archive_read_format_iso9660_read_data_skip,
 460             archive_read_format_iso9660_cleanup);
 461
 462         if (r != ARCHIVE_OK) {
 463                 free(iso9660);
 464                 return (r);
 465         }
 466         return (ARCHIVE_OK);
 467 }
 468
 469
 470 static int
 471 archive_read_format_iso9660_bid(struct archive_read *a)
 472 {
 473         struct iso9660 *iso9660;
 474         ssize_t bytes_read;
 475         const void *h;
 476         const unsigned char *p;
 477         int seenTerminator;
 478
 479         iso9660 = (struct iso9660 *)(a->format->data);
 480
 481         /*
 482          * Skip the first 32k (reserved area) and get the first
 483          * 8 sectors of the volume descriptor table.  Of course,
 484          * if the I/O layer gives us more, we'll take it.
 485          */
 486 #define RESERVED_AREA   (SYSTEM_AREA_BLOCK * LOGICAL_BLOCK_SIZE)
 487         h = __archive_read_ahead(a,
 488             RESERVED_AREA + 8 * LOGICAL_BLOCK_SIZE,
 489             &bytes_read);
 490         if (h == NULL)
 491             return (-1);
 492         p = (const unsigned char *)h;
 493
 494         /* Skip the reserved area. */
 495         bytes_read -= RESERVED_AREA;
 496         p += RESERVED_AREA;
 497
 498         /* Check each volume descriptor. */
 499         seenTerminator = 0;
 500         for (; bytes_read > LOGICAL_BLOCK_SIZE;
 501             bytes_read -= LOGICAL_BLOCK_SIZE, p += LOGICAL_BLOCK_SIZE) {
 502                 /* Do not handle undefined Volume Descriptor Type. */
 503                 if (p[0] >= 4 && p[0] <= 254)
 504                         return (0);
 505                 /* Standard Identifier must be "CD001" */
 506                 if (memcmp(p + 1, "CD001", 5) != 0)
 507                         return (0);
 508                 if (!iso9660->primary.location) {
 509                         if (isPVD(iso9660, p))
 510                                 continue;
 511                 }
 512                 if (!iso9660->joliet.location) {
 513                         if (isJolietSVD(iso9660, p))
 514                                 continue;
 515                 }
 516                 if (isBootRecord(iso9660, p))
 517                         continue;
 518                 if (isEVD(iso9660, p))
 519                         continue;
 520                 if (isSVD(iso9660, p))
 521                         continue;
 522                 if (isVolumePartition(iso9660, p))
 523                         continue;
 524                 if (isVDSetTerminator(iso9660, p)) {
 525                         seenTerminator = 1;
 526                         break;
 527                 }
 528                 return (0);
 529         }
 530         /*
 531          * ISO 9660 format must have Primary Volume Descriptor and
 532          * Volume Descriptor Set Terminator.
 533          */
 534         if (seenTerminator && iso9660->primary.location > 16)
 535                 return (48);
 536
 537         /* We didn't find a valid PVD; return a bid of zero. */
 538         return (0);
 539 }
 540
 541 static int
 542 archive_read_format_iso9660_options(struct archive_read *a,
 543                 const char *key, const char *val)
 544 {
 545         struct iso9660 *iso9660;
 546
 547         iso9660 = (struct iso9660 *)(a->format->data);
 548
 549         if (strcmp(key, "joliet") == 0) {
 550                 if (val == NULL || strcmp(val, "off") == 0 ||
 551                                 strcmp(val, "ignore") == 0 ||
 552                                 strcmp(val, "disable") == 0 ||
 553                                 strcmp(val, "0") == 0)
 554                         iso9660->opt_support_joliet = 0;
 555                 else
 556                         iso9660->opt_support_joliet = 1;
 557                 return (ARCHIVE_OK);
 558         }
 559         if (strcmp(key, "rockridge") == 0 ||
 560             strcmp(key, "Rockridge") == 0) {
 561                 iso9660->opt_support_rockridge = val != NULL;
 562                 return (ARCHIVE_OK);
 563         }
 564
 565         /* Note: The "warn" return is just to inform the options
 566          * supervisor that we didn't handle it.  It will generate
 567          * a suitable error if noone used this option. */
 568         return (ARCHIVE_WARN);
 569 }
 570
 571 static int
 572 isBootRecord(struct iso9660 *iso9660, const unsigned char *h)
 573 {
 574         (void)iso9660; /* UNUSED */
 575
 576         /* Type of the Volume Descriptor Boot Record must be 0. */
 577         if (h[0] != 0)
 578                 return (0);
 579
 580         /* Volume Descriptor Version must be 1. */
 581         if (h[6] != 1)
 582                 return (0);
 583
 584         return (1);
 585 }
 586
 587 static int
 588 isVolumePartition(struct iso9660 *iso9660, const unsigned char *h)
 589 {
 590         int32_t location;
 591
 592         /* Type of the Volume Partition Descriptor must be 3. */
 593         if (h[0] != 3)
 594                 return (0);
 595
 596         /* Volume Descriptor Version must be 1. */
 597         if (h[6] != 1)
 598                 return (0);
 599         /* Unused Field */
 600         if (h[7] != 0)
 601                 return (0);
 602
 603         location = archive_le32dec(h + 72);
 604         if (location <= SYSTEM_AREA_BLOCK ||
 605             location >= iso9660->volume_block)
 606                 return (0);
 607         if ((uint32_t)location != archive_be32dec(h + 76))
 608                 return (0);
 609
 610         return (1);
 611 }
 612
 613 static int
 614 isVDSetTerminator(struct iso9660 *iso9660, const unsigned char *h)
 615 {
 616         int i;
 617
 618         (void)iso9660; /* UNUSED */
 619
 620         /* Type of the Volume Descriptor Set Terminator must be 255. */
 621         if (h[0] != 255)
 622                 return (0);
 623
 624         /* Volume Descriptor Version must be 1. */
 625         if (h[6] != 1)
 626                 return (0);
 627
 628         /* Reserved field must be 0. */
 629         for (i = 7; i < 2048; ++i)
 630                 if (h[i] != 0)
 631                         return (0);
 632
 633         return (1);
 634 }
 635
 636 static int
 637 isJolietSVD(struct iso9660 *iso9660, const unsigned char *h)
 638 {
 639         const unsigned char *p;
 640         ssize_t logical_block_size;
 641         int32_t volume_block;
 642
 643         /* Check if current sector is a kind of Supplementary Volume
 644          * Descriptor. */
 645         if (!isSVD(iso9660, h))
 646                 return (0);
 647
 648         /* FIXME: do more validations according to joliet spec. */
 649
 650         /* check if this SVD contains joliet extension! */
 651         p = h + SVD_escape_sequences_offset;
 652         /* N.B. Joliet spec says p[1] == '\\', but.... */
 653         if (p[0] == '%' && p[1] == '/') {
 654                 int level = 0;
 655
 656                 if (p[2] == '@')
 657                         level = 1;
 658                 else if (p[2] == 'C')
 659                         level = 2;
 660                 else if (p[2] == 'E')
 661                         level = 3;
 662                 else /* not joliet */
 663                         return (0);
 664
 665                 iso9660->seenJoliet = level;
 666
 667         } else /* not joliet */
 668                 return (0);
 669
 670         logical_block_size =
 671             archive_le16dec(h + SVD_logical_block_size_offset);
 672         volume_block = archive_le32dec(h + SVD_volume_space_size_offset);
 673
 674         iso9660->logical_block_size = logical_block_size;
 675         iso9660->volume_block = volume_block;
 676         iso9660->volume_size = logical_block_size * (uint64_t)volume_block;
 677         /* Read Root Directory Record in Volume Descriptor. */
 678         p = h + SVD_root_directory_record_offset;
 679         iso9660->joliet.location = archive_le32dec(p + DR_extent_offset);
 680         iso9660->joliet.size = archive_le32dec(p + DR_size_offset);
 681
 682         return (48);
 683 }
 684
 685 static int
 686 isSVD(struct iso9660 *iso9660, const unsigned char *h)
 687 {
 688         const unsigned char *p;
 689         ssize_t logical_block_size;
 690         int32_t volume_block;
 691         int32_t location;
 692         int i;
 693
 694         (void)iso9660; /* UNUSED */
 695
 696         /* Type 2 means it's a SVD. */
 697         if (h[SVD_type_offset] != 2)
 698                 return (0);
 699
 700         /* Reserved field must be 0. */
 701         for (i = 0; i < SVD_reserved1_size; ++i)
 702                 if (h[SVD_reserved1_offset + i] != 0)
 703                         return (0);
 704         for (i = 0; i < SVD_reserved2_size; ++i)
 705                 if (h[SVD_reserved2_offset + i] != 0)
 706                         return (0);
 707         for (i = 0; i < SVD_reserved3_size; ++i)
 708                 if (h[SVD_reserved3_offset + i] != 0)
 709                         return (0);
 710
 711         /* File structure version must be 1 for ISO9660/ECMA119. */
 712         if (h[SVD_file_structure_version_offset] != 1)
 713                 return (0);
 714
 715         logical_block_size =
 716             archive_le16dec(h + SVD_logical_block_size_offset);
 717         if (logical_block_size <= 0)
 718                 return (0);
 719
 720         volume_block = archive_le32dec(h + SVD_volume_space_size_offset);
 721         if (volume_block <= SYSTEM_AREA_BLOCK+4)
 722                 return (0);
 723
 724         /* Location of Occurrence of Type L Path Table must be
 725          * available location,
 726          * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 727         location = archive_le32dec(h+SVD_type_L_path_table_offset);
 728         if (location < SYSTEM_AREA_BLOCK+2 || location >= volume_block)
 729                 return (0);
 730
 731         /* The Type M Path Table must be at a valid location (WinISO
 732          * and probably other programs omit this, so we allow zero)
 733          *
 734          * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 735         location = archive_be32dec(h+SVD_type_M_path_table_offset);
 736         if ((location > 0 && location < SYSTEM_AREA_BLOCK+2)
 737             || location >= volume_block)
 738                 return (0);
 739
 740         /* Read Root Directory Record in Volume Descriptor. */
 741         p = h + SVD_root_directory_record_offset;
 742         if (p[DR_length_offset] != 34)
 743                 return (0);
 744
 745         return (48);
 746 }
 747
 748 static int
 749 isEVD(struct iso9660 *iso9660, const unsigned char *h)
 750 {
 751         const unsigned char *p;
 752         ssize_t logical_block_size;
 753         int32_t volume_block;
 754         int32_t location;
 755         int i;
 756
 757         (void)iso9660; /* UNUSED */
 758
 759         /* Type of the Enhanced Volume Descriptor must be 2. */
 760         if (h[PVD_type_offset] != 2)
 761                 return (0);
 762
 763         /* EVD version must be 2. */
 764         if (h[PVD_version_offset] != 2)
 765                 return (0);
 766
 767         /* Reserved field must be 0. */
 768         if (h[PVD_reserved1_offset] != 0)
 769                 return (0);
 770
 771         /* Reserved field must be 0. */
 772         for (i = 0; i < PVD_reserved2_size; ++i)
 773                 if (h[PVD_reserved2_offset + i] != 0)
 774                         return (0);
 775
 776         /* Reserved field must be 0. */
 777         for (i = 0; i < PVD_reserved3_size; ++i)
 778                 if (h[PVD_reserved3_offset + i] != 0)
 779                         return (0);
 780
 781         /* Logical block size must be > 0. */
 782         /* I've looked at Ecma 119 and can't find any stronger
 783          * restriction on this field. */
 784         logical_block_size =
 785             archive_le16dec(h + PVD_logical_block_size_offset);
 786         if (logical_block_size <= 0)
 787                 return (0);
 788
 789         volume_block =
 790             archive_le32dec(h + PVD_volume_space_size_offset);
 791         if (volume_block <= SYSTEM_AREA_BLOCK+4)
 792                 return (0);
 793
 794         /* File structure version must be 2 for ISO9660:1999. */
 795         if (h[PVD_file_structure_version_offset] != 2)
 796                 return (0);
 797
 798         /* Location of Occurrence of Type L Path Table must be
 799          * available location,
 800          * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 801         location = archive_le32dec(h+PVD_type_1_path_table_offset);
 802         if (location < SYSTEM_AREA_BLOCK+2 || location >= volume_block)
 803                 return (0);
 804
 805         /* Location of Occurrence of Type M Path Table must be
 806          * available location,
 807          * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 808         location = archive_be32dec(h+PVD_type_m_path_table_offset);
 809         if ((location > 0 && location < SYSTEM_AREA_BLOCK+2)
 810             || location >= volume_block)
 811                 return (0);
 812
 813         /* Reserved field must be 0. */
 814         for (i = 0; i < PVD_reserved4_size; ++i)
 815                 if (h[PVD_reserved4_offset + i] != 0)
 816                         return (0);
 817
 818         /* Reserved field must be 0. */
 819         for (i = 0; i < PVD_reserved5_size; ++i)
 820                 if (h[PVD_reserved5_offset + i] != 0)
 821                         return (0);
 822
 823         /* Read Root Directory Record in Volume Descriptor. */
 824         p = h + PVD_root_directory_record_offset;
 825         if (p[DR_length_offset] != 34)
 826                 return (0);
 827
 828         return (48);
 829 }
 830
 831 static int
 832 isPVD(struct iso9660 *iso9660, const unsigned char *h)
 833 {
 834         const unsigned char *p;
 835         ssize_t logical_block_size;
 836         int32_t volume_block;
 837         int32_t location;
 838         int i;
 839
 840         /* Type of the Primary Volume Descriptor must be 1. */
 841         if (h[PVD_type_offset] != 1)
 842                 return (0);
 843
 844         /* PVD version must be 1. */
 845         if (h[PVD_version_offset] != 1)
 846                 return (0);
 847
 848         /* Reserved field must be 0. */
 849         if (h[PVD_reserved1_offset] != 0)
 850                 return (0);
 851
 852         /* Reserved field must be 0. */
 853         for (i = 0; i < PVD_reserved2_size; ++i)
 854                 if (h[PVD_reserved2_offset + i] != 0)
 855                         return (0);
 856
 857         /* Reserved field must be 0. */
 858         for (i = 0; i < PVD_reserved3_size; ++i)
 859                 if (h[PVD_reserved3_offset + i] != 0)
 860                         return (0);
 861
 862         /* Logical block size must be > 0. */
 863         /* I've looked at Ecma 119 and can't find any stronger
 864          * restriction on this field. */
 865         logical_block_size =
 866             archive_le16dec(h + PVD_logical_block_size_offset);
 867         if (logical_block_size <= 0)
 868                 return (0);
 869
 870         volume_block = archive_le32dec(h + PVD_volume_space_size_offset);
 871         if (volume_block <= SYSTEM_AREA_BLOCK+4)
 872                 return (0);
 873
 874         /* File structure version must be 1 for ISO9660/ECMA119. */
 875         if (h[PVD_file_structure_version_offset] != 1)
 876                 return (0);
 877
 878         /* Location of Occurrence of Type L Path Table must be
 879          * available location,
 880          * > SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 881         location = archive_le32dec(h+PVD_type_1_path_table_offset);
 882         if (location < SYSTEM_AREA_BLOCK+2 || location >= volume_block)
 883                 return (0);
 884
 885         /* The Type M Path Table must also be at a valid location
 886          * (although ECMA 119 requires a Type M Path Table, WinISO and
 887          * probably other programs omit it, so we permit a zero here)
 888          *
 889          * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
 890         location = archive_be32dec(h+PVD_type_m_path_table_offset);
 891         if ((location > 0 && location < SYSTEM_AREA_BLOCK+2)
 892             || location >= volume_block)
 893                 return (0);
 894
 895         /* Reserved field must be 0. */
 896         for (i = 0; i < PVD_reserved4_size; ++i)
 897                 if (h[PVD_reserved4_offset + i] != 0)
 898                         return (0);
 899
 900         /* Reserved field must be 0. */
 901         for (i = 0; i < PVD_reserved5_size; ++i)
 902                 if (h[PVD_reserved5_offset + i] != 0)
 903                         return (0);
 904
 905         /* XXX TODO: Check other values for sanity; reject more
 906          * malformed PVDs. XXX */
 907
 908         /* Read Root Directory Record in Volume Descriptor. */
 909         p = h + PVD_root_directory_record_offset;
 910         if (p[DR_length_offset] != 34)
 911                 return (0);
 912
 913         iso9660->logical_block_size = logical_block_size;
 914         iso9660->volume_block = volume_block;
 915         iso9660->volume_size = logical_block_size * (uint64_t)volume_block;
 916         iso9660->primary.location = archive_le32dec(p + DR_extent_offset);
 917         iso9660->primary.size = archive_le32dec(p + DR_size_offset);
 918
 919         return (48);
 920 }
 921
 922 static int
 923 read_children(struct archive_read *a, struct file_info *parent)
 924 {
 925         struct iso9660 *iso9660;
 926         const unsigned char *b, *p;
 927         struct file_info *multi;
 928         size_t step;
 929
 930         iso9660 = (struct iso9660 *)(a->format->data);
 931         if (iso9660->current_position > parent->offset) {
 932                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 933                     "Ignoring out-of-order directory (%s) %jd > %jd",
 934                     parent->name.s,
 935                     (intmax_t)iso9660->current_position,
 936                     (intmax_t)parent->offset);
 937                 return (ARCHIVE_WARN);
 938         }
 939         if (parent->offset + parent->size > iso9660->volume_size) {
 940                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 941                     "Directory is beyond end-of-media: %s",
 942                     parent->name.s);
 943                 return (ARCHIVE_WARN);
 944         }
 945         if (iso9660->current_position < parent->offset) {
 946                 int64_t skipsize;
 947
 948                 skipsize = parent->offset - iso9660->current_position;
 949                 skipsize = __archive_read_skip(a, skipsize);
 950                 if (skipsize < 0)
 951                         return ((int)skipsize);
 952                 iso9660->current_position = parent->offset;
 953         }
 954
 955         step = ((parent->size + iso9660->logical_block_size -1) /
 956             iso9660->logical_block_size) * iso9660->logical_block_size;
 957         b = __archive_read_ahead(a, step, NULL);
 958         if (b == NULL) {
 959                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 960                     "Failed to read full block when scanning "
 961                     "ISO9660 directory list");
 962                 return (ARCHIVE_FATAL);
 963         }
 964         __archive_read_consume(a, step);
 965         iso9660->current_position += step;
 966         multi = NULL;
 967         while (step) {
 968                 p = b;
 969                 b += iso9660->logical_block_size;
 970                 step -= iso9660->logical_block_size;
 971                 for (; *p != 0 && p < b && p + *p <= b; p += *p) {
 972                         struct file_info *child;
 973
 974                         /* N.B.: these special directory identifiers
 975                          * are 8 bit "values" even on a
 976                          * Joliet CD with UCS-2 (16bit) encoding.
 977                          */
 978
 979                         /* Skip '.' entry. */
 980                         if (*(p + DR_name_len_offset) == 1
 981                             && *(p + DR_name_offset) == '\0')
 982                                 continue;
 983                         /* Skip '..' entry. */
 984                         if (*(p + DR_name_len_offset) == 1
 985                             && *(p + DR_name_offset) == '\001')
 986                                 continue;
 987                         child = parse_file_info(a, parent, p);
 988                         if (child == NULL)
 989                                 return (ARCHIVE_FATAL);
 990                         if (child->cl_offset == 0 &&
 991                             (child->multi_extent || multi != NULL)) {
 992                                 struct content *con;
 993
 994                                 if (multi == NULL) {
 995                                         multi = child;
 996                                         multi->contents.first = NULL;
 997                                         multi->contents.last =
 998                                             &(multi->contents.first);
 999                                 }
1000                                 con = malloc(sizeof(struct content));
1001                                 if (con == NULL) {
1002                                         archive_set_error(
1003                                             &a->archive, ENOMEM,
1004                                             "No memory for "
1005                                             "multi extent");
1006                                         return (ARCHIVE_FATAL);
1007                                 }
1008                                 con->offset = child->offset;
1009                                 con->size = child->size;
1010                                 con->next = NULL;
1011                                 *multi->contents.last = con;
1012                                 multi->contents.last = &(con->next);
1013                                 if (multi == child)
1014                                         add_entry(iso9660, child);
1015                                 else {
1016                                         multi->size += child->size;
1017                                         if (!child->multi_extent)
1018                                                 multi = NULL;
1019                                 }
1020                         } else
1021                                 add_entry(iso9660, child);
1022                 }
1023         }
1024
1025         /* Read data which recorded by RRIP "CE" extension. */
1026         if (read_CE(a, iso9660) != ARCHIVE_OK)
1027                 return (ARCHIVE_FATAL);
1028
1029         return (ARCHIVE_OK);
1030 }
1031
1032 static int
1033 archive_read_format_iso9660_read_header(struct archive_read *a,
1034     struct archive_entry *entry)
1035 {
1036         struct iso9660 *iso9660;
1037         struct file_info *file;
1038         int r, rd_r = ARCHIVE_OK;
1039
1040         iso9660 = (struct iso9660 *)(a->format->data);
1041
1042         if (!a->archive.archive_format) {
1043                 a->archive.archive_format = ARCHIVE_FORMAT_ISO9660;
1044                 a->archive.archive_format_name = "ISO9660";
1045         }
1046
1047         if (iso9660->current_position == 0) {
1048                 int64_t skipsize;
1049                 struct vd *vd;
1050                 const void *block;
1051                 char seenJoliet;
1052
1053                 vd = &(iso9660->primary);
1054                 if (!iso9660->opt_support_joliet)
1055                         iso9660->seenJoliet = 0;
1056                 if (iso9660->seenJoliet &&
1057                         vd->location > iso9660->joliet.location)
1058                         /* This condition is unlikely; by way of caution. */
1059                         vd = &(iso9660->joliet);
1060
1061                 skipsize = LOGICAL_BLOCK_SIZE * vd->location;
1062                 skipsize = __archive_read_skip(a, skipsize);
1063                 if (skipsize < 0)
1064                         return ((int)skipsize);
1065                 iso9660->current_position = skipsize;
1066
1067                 block = __archive_read_ahead(a, vd->size, NULL);
1068                 if (block == NULL) {
1069                         archive_set_error(&a->archive,
1070                             ARCHIVE_ERRNO_MISC,
1071                             "Failed to read full block when scanning "
1072                             "ISO9660 directory list");
1073                         return (ARCHIVE_FATAL);
1074                 }
1075
1076                 /*
1077                  * While reading Root Directory, flag seenJoliet
1078                  * must be zero to avoid converting special name
1079                  * 0x00(Current Directory) and next byte to UCS2.
1080                  */
1081                 seenJoliet = iso9660->seenJoliet;/* Save flag. */
1082                 iso9660->seenJoliet = 0;
1083                 file = parse_file_info(a, NULL, block);
1084                 if (file == NULL)
1085                         return (ARCHIVE_FATAL);
1086                 iso9660->seenJoliet = seenJoliet;
1087                 if (vd == &(iso9660->primary) && iso9660->seenRockridge
1088                     && iso9660->seenJoliet)
1089                         /*
1090                          * If iso image has RockRidge and Joliet,
1091                          * we use RockRidge Extensions.
1092                          */
1093                         iso9660->seenJoliet = 0;
1094                 if (vd == &(iso9660->primary) && !iso9660->seenRockridge
1095                     && iso9660->seenJoliet) {
1096                         /* Switch reading data from primary to joliet. */
1097                         vd = &(iso9660->joliet);
1098                         skipsize = LOGICAL_BLOCK_SIZE * vd->location;
1099                         skipsize -= iso9660->current_position;
1100                         skipsize = __archive_read_skip(a, skipsize);
1101                         if (skipsize < 0)
1102                                 return ((int)skipsize);
1103                         iso9660->current_position += skipsize;
1104
1105                         block = __archive_read_ahead(a, vd->size, NULL);
1106                         if (block == NULL) {
1107                                 archive_set_error(&a->archive,
1108                                     ARCHIVE_ERRNO_MISC,
1109                                     "Failed to read full block when scanning "
1110                                     "ISO9660 directory list");
1111                                 return (ARCHIVE_FATAL);
1112                         }
1113                         seenJoliet = iso9660->seenJoliet;/* Save flag. */
1114                         iso9660->seenJoliet = 0;
1115                         file = parse_file_info(a, NULL, block);
1116                         if (file == NULL)
1117                                 return (ARCHIVE_FATAL);
1118                         iso9660->seenJoliet = seenJoliet;
1119                 }
1120                 /* Store the root directory in the pending list. */
1121                 add_entry(iso9660, file);
1122                 if (iso9660->seenRockridge) {
1123                         a->archive.archive_format =
1124                             ARCHIVE_FORMAT_ISO9660_ROCKRIDGE;
1125                         a->archive.archive_format_name =
1126                             "ISO9660 with Rockridge extensions";
1127                 }
1128         }
1129
1130         /* Get the next entry that appears after the current offset. */
1131         r = next_entry_seek(a, iso9660, &file);
1132         if (r != ARCHIVE_OK)
1133                 return (r);
1134
1135         iso9660->entry_bytes_remaining = file->size;
1136         iso9660->entry_sparse_offset = 0; /* Offset for sparse-file-aware clients. */
1137
1138         if (file->offset + file->size > iso9660->volume_size) {
1139                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1140                     "File is beyond end-of-media: %s", file->name.s);
1141                 iso9660->entry_bytes_remaining = 0;
1142                 iso9660->entry_sparse_offset = 0;
1143                 return (ARCHIVE_WARN);
1144         }
1145
1146         /* Set up the entry structure with information about this entry. */
1147         archive_entry_set_mode(entry, file->mode);
1148         archive_entry_set_uid(entry, file->uid);
1149         archive_entry_set_gid(entry, file->gid);
1150         archive_entry_set_nlink(entry, file->nlinks);
1151         if (file->birthtime_is_set)
1152                 archive_entry_set_birthtime(entry, file->birthtime, 0);
1153         else
1154                 archive_entry_unset_birthtime(entry);
1155         archive_entry_set_mtime(entry, file->mtime, 0);
1156         archive_entry_set_ctime(entry, file->ctime, 0);
1157         archive_entry_set_atime(entry, file->atime, 0);
1158         /* N.B.: Rock Ridge supports 64-bit device numbers. */
1159         archive_entry_set_rdev(entry, (dev_t)file->rdev);
1160         archive_entry_set_size(entry, iso9660->entry_bytes_remaining);
1161         archive_string_empty(&iso9660->pathname);
1162         archive_entry_set_pathname(entry,
1163             build_pathname(&iso9660->pathname, file));
1164         if (file->symlink.s != NULL)
1165                 archive_entry_copy_symlink(entry, file->symlink.s);
1166
1167         /* Note: If the input isn't seekable, we can't rewind to
1168          * return the same body again, so if the next entry refers to
1169          * the same data, we have to return it as a hardlink to the
1170          * original entry. */
1171         if (file->number != -1 &&
1172             file->number == iso9660->previous_number) {
1173                 archive_entry_set_hardlink(entry,
1174                     iso9660->previous_pathname.s);
1175                 archive_entry_unset_size(entry);
1176                 iso9660->entry_bytes_remaining = 0;
1177                 iso9660->entry_sparse_offset = 0;
1178                 return (ARCHIVE_OK);
1179         }
1180
1181         /* Except for the hardlink case above, if the offset of the
1182          * next entry is before our current position, we can't seek
1183          * backwards to extract it, so issue a warning.  Note that
1184          * this can only happen if this entry was added to the heap
1185          * after we passed this offset, that is, only if the directory
1186          * mentioning this entry is later than the body of the entry.
1187          * Such layouts are very unusual; most ISO9660 writers lay out
1188          * and record all directory information first, then store
1189          * all file bodies. */
1190         /* TODO: Someday, libarchive's I/O core will support optional
1191          * seeking.  When that day comes, this code should attempt to
1192          * seek and only return the error if the seek fails.  That
1193          * will give us support for whacky ISO images that require
1194          * seeking while retaining the ability to read almost all ISO
1195          * images in a streaming fashion. */
1196         if ((file->mode & AE_IFMT) != AE_IFDIR &&
1197             file->offset < iso9660->current_position) {
1198                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1199                     "Ignoring out-of-order file (%s) %jd < %jd",
1200                     iso9660->pathname.s,
1201                     (intmax_t)file->offset,
1202                     (intmax_t)iso9660->current_position);
1203                 iso9660->entry_bytes_remaining = 0;
1204                 iso9660->entry_sparse_offset = 0;
1205                 return (ARCHIVE_WARN);
1206         }
1207
1208         /* Initialize zisofs variables. */
1209         iso9660->entry_zisofs.pz = file->pz;
1210         if (file->pz) {
1211 #ifdef HAVE_ZLIB_H
1212                 struct zisofs  *zisofs;
1213
1214                 zisofs = &iso9660->entry_zisofs;
1215                 zisofs->initialized = 0;
1216                 zisofs->pz_log2_bs = file->pz_log2_bs;
1217                 zisofs->pz_uncompressed_size = file->pz_uncompressed_size;
1218                 zisofs->pz_offset = 0;
1219                 zisofs->header_avail = 0;
1220                 zisofs->header_passed = 0;
1221                 zisofs->block_pointers_avail = 0;
1222 #endif
1223                 archive_entry_set_size(entry, file->pz_uncompressed_size);
1224         }
1225
1226         iso9660->previous_number = file->number;
1227         archive_strcpy(&iso9660->previous_pathname, iso9660->pathname.s);
1228
1229         /* Reset entry_bytes_remaining if the file is multi extent. */
1230         iso9660->entry_content = file->contents.first;
1231         if (iso9660->entry_content != NULL)
1232                 iso9660->entry_bytes_remaining = iso9660->entry_content->size;
1233
1234         if (archive_entry_filetype(entry) == AE_IFDIR) {
1235                 /* Overwrite nlinks by proper link number which is
1236                  * calculated from number of sub directories. */
1237                 archive_entry_set_nlink(entry, 2 + file->subdirs);
1238                 /* Directory data has been read completely. */
1239                 iso9660->entry_bytes_remaining = 0;
1240                 iso9660->entry_sparse_offset = 0;
1241         }
1242
1243         if (rd_r != ARCHIVE_OK)
1244                 return (rd_r);
1245         return (ARCHIVE_OK);
1246 }
1247
1248 static int
1249 archive_read_format_iso9660_read_data_skip(struct archive_read *a)
1250 {
1251         /* Because read_next_header always does an explicit skip
1252          * to the next entry, we don't need to do anything here. */
1253         (void)a; /* UNUSED */
1254         return (ARCHIVE_OK);
1255 }
1256
1257 #ifdef HAVE_ZLIB_H
1258
1259 static int
1260 zisofs_read_data(struct archive_read *a,
1261     const void **buff, size_t *size, off_t *offset)
1262 {
1263         struct iso9660 *iso9660;
1264         struct zisofs  *zisofs;
1265         const unsigned char *p;
1266         size_t avail;
1267         ssize_t bytes_read;
1268         size_t uncompressed_size;
1269         int r;
1270
1271         iso9660 = (struct iso9660 *)(a->format->data);
1272         zisofs = &iso9660->entry_zisofs;
1273
1274         p = __archive_read_ahead(a, 1, &bytes_read);
1275         if (bytes_read <= 0) {
1276                 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1277                     "Truncated zisofs file body");
1278                 return (ARCHIVE_FATAL);
1279         }
1280         if (bytes_read > iso9660->entry_bytes_remaining)
1281                 bytes_read = iso9660->entry_bytes_remaining;
1282         avail = bytes_read;
1283         uncompressed_size = 0;
1284
1285         if (!zisofs->initialized) {
1286                 size_t ceil, xsize;
1287
1288                 /* Allocate block pointers buffer. */
1289                 ceil = (zisofs->pz_uncompressed_size +
1290                         (1LL << zisofs->pz_log2_bs) - 1)
1291                         >> zisofs->pz_log2_bs;
1292                 xsize = (ceil + 1) * 4;
1293                 if (zisofs->block_pointers_alloc < xsize) {
1294                         size_t alloc;
1295
1296                         if (zisofs->block_pointers != NULL)
1297                                 free(zisofs->block_pointers);
1298                         alloc = ((xsize >> 10) + 1) << 10;
1299                         zisofs->block_pointers = malloc(alloc);
1300                         if (zisofs->block_pointers == NULL) {
1301                                 archive_set_error(&a->archive, ENOMEM,
1302                                     "No memory for zisofs decompression");
1303                                 return (ARCHIVE_FATAL);
1304                         }
1305                         zisofs->block_pointers_alloc = alloc;
1306                 }
1307                 zisofs->block_pointers_size = xsize;
1308
1309                 /* Allocate uncompressed data buffer. */
1310                 xsize = 1UL << zisofs->pz_log2_bs;
1311                 if (zisofs->uncompressed_buffer_size < xsize) {
1312                         if (zisofs->uncompressed_buffer != NULL)
1313                                 free(zisofs->uncompressed_buffer);
1314                         zisofs->uncompressed_buffer = malloc(xsize);
1315                         if (zisofs->uncompressed_buffer == NULL) {
1316                                 archive_set_error(&a->archive, ENOMEM,
1317                                     "No memory for zisofs decompression");
1318                                 return (ARCHIVE_FATAL);
1319                         }
1320                 }
1321                 zisofs->uncompressed_buffer_size = xsize;
1322
1323                 /*
1324                  * Read the file header, and check the magic code of zisofs.
1325                  */
1326                 if (zisofs->header_avail < sizeof(zisofs->header)) {
1327                         xsize = sizeof(zisofs->header) - zisofs->header_avail;
1328                         if (avail < xsize)
1329                                 xsize = avail;
1330                         memcpy(zisofs->header + zisofs->header_avail, p, xsize);
1331                         zisofs->header_avail += xsize;
1332                         avail -= xsize;
1333                         p += xsize;
1334                 }
1335                 if (!zisofs->header_passed &&
1336                     zisofs->header_avail == sizeof(zisofs->header)) {
1337                         int err = 0;
1338
1339                         if (memcmp(zisofs->header, zisofs_magic,
1340                             sizeof(zisofs_magic)) != 0)
1341                                 err = 1;
1342                         if (archive_le32dec(zisofs->header + 8)
1343                             != zisofs->pz_uncompressed_size)
1344                                 err = 1;
1345                         if (zisofs->header[12] != 4)
1346                                 err = 1;
1347                         if (zisofs->header[13] != zisofs->pz_log2_bs)
1348                                 err = 1;
1349                         if (err) {
1350                                 archive_set_error(&a->archive,
1351                                     ARCHIVE_ERRNO_FILE_FORMAT,
1352                                     "Illegal zisofs file body");
1353                                 return (ARCHIVE_FATAL);
1354                         }
1355                         zisofs->header_passed = 1;
1356                 }
1357                 /*
1358                  * Read block pointers.
1359                  */
1360                 if (zisofs->header_passed &&
1361                     zisofs->block_pointers_avail < zisofs->block_pointers_size) {
1362                         xsize = zisofs->block_pointers_size
1363                             - zisofs->block_pointers_avail;
1364                         if (avail < xsize)
1365                                 xsize = avail;
1366                         memcpy(zisofs->block_pointers
1367                             + zisofs->block_pointers_avail, p, xsize);
1368                         zisofs->block_pointers_avail += xsize;
1369                         avail -= xsize;
1370                         p += xsize;
1371                         if (zisofs->block_pointers_avail
1372                             == zisofs->block_pointers_size) {
1373                                 /* We've got all block pointers and initialize
1374                                  * related variables.   */
1375                                 zisofs->block_off = 0;
1376                                 zisofs->block_avail = 0;
1377                                 /* Complete a initialization */
1378                                 zisofs->initialized = 1;
1379                         }
1380                 }
1381
1382                 if (!zisofs->initialized)
1383                         goto next_data; /* We need more datas. */
1384         }
1385
1386         /*
1387          * Get block offsets from block pointers.
1388          */
1389         if (zisofs->block_avail == 0) {
1390                 uint32_t bst, bed;
1391
1392                 if (zisofs->block_off + 4 >= zisofs->block_pointers_size) {
1393                         /* There isn't a pair of offsets. */
1394                         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1395                             "Illegal zisofs block pointers");
1396                         return (ARCHIVE_FATAL);
1397                 }
1398                 bst = archive_le32dec(zisofs->block_pointers + zisofs->block_off);
1399                 if (bst != zisofs->pz_offset + (bytes_read - avail)) {
1400                         /* TODO: Should we seek offset of current file by bst ? */
1401                         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1402                             "Illegal zisofs block pointers(cannot seek)");
1403                         return (ARCHIVE_FATAL);
1404                 }
1405                 bed = archive_le32dec(
1406                     zisofs->block_pointers + zisofs->block_off + 4);
1407                 if (bed < bst) {
1408                         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1409                             "Illegal zisofs block pointers");
1410                         return (ARCHIVE_FATAL);
1411                 }
1412                 zisofs->block_avail = bed - bst;
1413                 zisofs->block_off += 4;
1414
1415                 /* Initialize compression library for new block. */
1416                 if (zisofs->stream_valid)
1417                         r = inflateReset(&zisofs->stream);
1418                 else
1419                         r = inflateInit(&zisofs->stream);
1420                 if (r != Z_OK) {
1421                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1422                             "Can't initialize zisofs decompression.");
1423                         return (ARCHIVE_FATAL);
1424                 }
1425                 zisofs->stream_valid = 1;
1426                 zisofs->stream.total_in = 0;
1427                 zisofs->stream.total_out = 0;
1428         }
1429
1430         /*
1431          * Make uncompressed datas.
1432          */
1433         if (zisofs->block_avail == 0) {
1434                 memset(zisofs->uncompressed_buffer, 0,
1435                     zisofs->uncompressed_buffer_size);
1436                 uncompressed_size = zisofs->uncompressed_buffer_size;
1437         } else {
1438                 zisofs->stream.next_in = (Bytef *)(uintptr_t)(const void *)p;
1439                 if (avail > zisofs->block_avail)
1440                         zisofs->stream.avail_in = zisofs->block_avail;
1441                 else
1442                         zisofs->stream.avail_in = avail;
1443                 zisofs->stream.next_out = zisofs->uncompressed_buffer;
1444                 zisofs->stream.avail_out = zisofs->uncompressed_buffer_size;
1445
1446                 r = inflate(&zisofs->stream, 0);
1447                 switch (r) {
1448                 case Z_OK: /* Decompressor made some progress.*/
1449                 case Z_STREAM_END: /* Found end of stream. */
1450                         break;
1451                 default:
1452                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1453                             "zisofs decompression failed (%d)", r);
1454                         return (ARCHIVE_FATAL);
1455                 }
1456                 uncompressed_size =
1457                     zisofs->uncompressed_buffer_size - zisofs->stream.avail_out;
1458                 avail -= zisofs->stream.next_in - p;
1459                 zisofs->block_avail -= zisofs->stream.next_in - p;
1460         }
1461 next_data:
1462         bytes_read -= avail;
1463         *buff = zisofs->uncompressed_buffer;
1464         *size = uncompressed_size;
1465         *offset = iso9660->entry_sparse_offset;
1466         iso9660->entry_sparse_offset += uncompressed_size;
1467         iso9660->entry_bytes_remaining -= bytes_read;
1468         iso9660->current_position += bytes_read;
1469         zisofs->pz_offset += bytes_read;
1470         __archive_read_consume(a, bytes_read);
1471
1472         return (ARCHIVE_OK);
1473 }
1474
1475 #else /* HAVE_ZLIB_H */
1476
1477 static int
1478 zisofs_read_data(struct archive_read *a,
1479     const void **buff, size_t *size, off_t *offset)
1480 {
1481
1482         (void)buff;/* UNUSED */
1483         (void)size;/* UNUSED */
1484         (void)offset;/* UNUSED */
1485         archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1486             "zisofs is not supported on this platform.");
1487         return (ARCHIVE_FAILED);
1488 }
1489
1490 #endif /* HAVE_ZLIB_H */
1491
1492 static int
1493 archive_read_format_iso9660_read_data(struct archive_read *a,
1494     const void **buff, size_t *size, off_t *offset)
1495 {
1496         ssize_t bytes_read;
1497         struct iso9660 *iso9660;
1498
1499         iso9660 = (struct iso9660 *)(a->format->data);
1500         if (iso9660->entry_bytes_remaining <= 0) {
1501                 if (iso9660->entry_content != NULL)
1502                         iso9660->entry_content = iso9660->entry_content->next;
1503                 if (iso9660->entry_content == NULL) {
1504                         *buff = NULL;
1505                         *size = 0;
1506                         *offset = iso9660->entry_sparse_offset;
1507                         return (ARCHIVE_EOF);
1508                 }
1509                 /* Seek forward to the start of the entry. */
1510                 if (iso9660->current_position < iso9660->entry_content->offset) {
1511                         int64_t step;
1512
1513                         step = iso9660->entry_content->offset -
1514                             iso9660->current_position;
1515                         step = __archive_read_skip(a, step);
1516                         if (step < 0)
1517                                 return ((int)step);
1518                         iso9660->current_position =
1519                             iso9660->entry_content->offset;
1520                 }
1521                 if (iso9660->entry_content->offset < iso9660->current_position) {
1522                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1523                             "Ignoring out-of-order file (%s) %jd < %jd",
1524                             iso9660->pathname.s,
1525                             (intmax_t)iso9660->entry_content->offset,
1526                             (intmax_t)iso9660->current_position);
1527                         *buff = NULL;
1528                         *size = 0;
1529                         *offset = iso9660->entry_sparse_offset;
1530                         return (ARCHIVE_WARN);
1531                 }
1532                 iso9660->entry_bytes_remaining = iso9660->entry_content->size;
1533         }
1534         if (iso9660->entry_zisofs.pz)
1535                 return (zisofs_read_data(a, buff, size, offset));
1536
1537         *buff = __archive_read_ahead(a, 1, &bytes_read);
1538         if (bytes_read == 0)
1539                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1540                     "Truncated input file");
1541         if (*buff == NULL)
1542                 return (ARCHIVE_FATAL);
1543         if (bytes_read > iso9660->entry_bytes_remaining)
1544                 bytes_read = iso9660->entry_bytes_remaining;
1545         *size = bytes_read;
1546         *offset = iso9660->entry_sparse_offset;
1547         iso9660->entry_sparse_offset += bytes_read;
1548         iso9660->entry_bytes_remaining -= bytes_read;
1549         iso9660->current_position += bytes_read;
1550         __archive_read_consume(a, bytes_read);
1551         return (ARCHIVE_OK);
1552 }
1553
1554 static int
1555 archive_read_format_iso9660_cleanup(struct archive_read *a)
1556 {
1557         struct iso9660 *iso9660;
1558         int r = ARCHIVE_OK;
1559
1560         iso9660 = (struct iso9660 *)(a->format->data);
1561         release_files(iso9660);
1562         free(iso9660->read_ce_req.reqs);
1563         archive_string_free(&iso9660->pathname);
1564         archive_string_free(&iso9660->previous_pathname);
1565         if (iso9660->pending_files.files)
1566                 free(iso9660->pending_files.files);
1567 #ifdef HAVE_ZLIB_H
1568         free(iso9660->entry_zisofs.uncompressed_buffer);
1569         free(iso9660->entry_zisofs.block_pointers);
1570         if (iso9660->entry_zisofs.stream_valid) {
1571                 if (inflateEnd(&iso9660->entry_zisofs.stream) != Z_OK) {
1572                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1573                             "Failed to clean up zlib decompressor");
1574                         r = ARCHIVE_FATAL;
1575                 }
1576         }
1577 #endif
1578         free(iso9660);
1579         (a->format->data) = NULL;
1580         return (r);
1581 }
1582
1583 /*
1584  * This routine parses a single ISO directory record, makes sense
1585  * of any extensions, and stores the result in memory.
1586  */
1587 static struct file_info *
1588 parse_file_info(struct archive_read *a, struct file_info *parent,
1589     const unsigned char *isodirrec)
1590 {
1591         struct iso9660 *iso9660;
1592         struct file_info *file;
1593         size_t name_len;
1594         const unsigned char *rr_start, *rr_end;
1595         const unsigned char *p;
1596         size_t dr_len;
1597         uint64_t fsize;
1598         int32_t location;
1599         int flags;
1600
1601         iso9660 = (struct iso9660 *)(a->format->data);
1602
1603         dr_len = (size_t)isodirrec[DR_length_offset];
1604         name_len = (size_t)isodirrec[DR_name_len_offset];
1605         location = archive_le32dec(isodirrec + DR_extent_offset);
1606         fsize = toi(isodirrec + DR_size_offset, DR_size_size);
1607         /* Sanity check that dr_len needs at least 34. */
1608         if (dr_len < 34) {
1609                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1610                     "Invalid length of directory record");
1611                 return (NULL);
1612         }
1613         /* Sanity check that name_len doesn't exceed dr_len. */
1614         if (dr_len - 33 < name_len || name_len == 0) {
1615                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1616                     "Invalid length of file identifier");
1617                 return (NULL);
1618         }
1619         /* Sanity check that location doesn't exceed volume block.
1620          * Don't check lower limit of location; it's possibility
1621          * the location has negative value when file type is symbolic
1622          * link or file size is zero. As far as I know latest mkisofs
1623          * do that.
1624          */
1625         if (location > 0 &&
1626             (location + ((fsize + iso9660->logical_block_size -1)
1627                / iso9660->logical_block_size)) > iso9660->volume_block) {
1628                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1629                     "Invalid location of extent of file");
1630                 return (NULL);
1631         }
1632
1633         /* Create a new file entry and copy data from the ISO dir record. */
1634         file = (struct file_info *)malloc(sizeof(*file));
1635         if (file == NULL) {
1636                 archive_set_error(&a->archive, ENOMEM,
1637                     "No memory for file entry");
1638                 return (NULL);
1639         }
1640         memset(file, 0, sizeof(*file));
1641         file->parent = parent;
1642         file->offset = iso9660->logical_block_size * (uint64_t)location;
1643         file->size = fsize;
1644         file->mtime = isodate7(isodirrec + DR_date_offset);
1645         file->ctime = file->atime = file->mtime;
1646         file->rede_files.first = NULL;
1647         file->rede_files.last = &(file->rede_files.first);
1648
1649         p = isodirrec + DR_name_offset;
1650         /* Rockridge extensions (if any) follow name.  Compute this
1651          * before fidgeting the name_len below. */
1652         rr_start = p + name_len + (name_len & 1 ? 0 : 1);
1653         rr_end = isodirrec + dr_len;
1654
1655         if (iso9660->seenJoliet) {
1656                 /* Joliet names are max 64 chars (128 bytes) according to spec,
1657                  * but genisoimage/mkisofs allows recording longer Joliet
1658                  * names which are 103 UCS2 characters(206 bytes) by their
1659                  * option '-joliet-long'.
1660                  */
1661                 wchar_t wbuff[103+1], *wp;
1662                 const unsigned char *c;
1663
1664                 if (name_len > 206)
1665                         name_len = 206;
1666                 /* convert BE UTF-16 to wchar_t */
1667                 for (c = p, wp = wbuff;
1668                                 c < (p + name_len) &&
1669                                 wp < (wbuff + sizeof(wbuff)/sizeof(*wbuff) - 1);
1670                                 c += 2) {
1671                         *wp++ = (((255 & (int)c[0]) << 8) | (255 & (int)c[1]));
1672                 }
1673                 *wp = L'\0';
1674
1675 #if 0 /* untested code, is it at all useful on Joliet? */
1676                 /* trim trailing first version and dot from filename.
1677                  *
1678                  * Remember we where in UTF-16BE land!
1679                  * SEPARATOR 1 (.) and SEPARATOR 2 (;) are both
1680                  * 16 bits big endian characters on Joliet.
1681                  *
1682                  * TODO: sanitize filename?
1683                  *       Joliet allows any UCS-2 char except:
1684                  *       *, /, :, ;, ? and \.
1685                  */
1686                 /* Chop off trailing ';1' from files. */
1687                 if (*(wp-2) == ';' && *(wp-1) == '1') {
1688                         wp-=2;
1689                         *wp = L'\0';
1690                 }
1691
1692                 /* Chop off trailing '.' from filenames. */
1693                 if (*(wp-1) == '.')
1694                         *(--wp) = L'\0';
1695 #endif
1696
1697                 /* store the result in the file name field. */
1698                 archive_strappend_w_utf8(&file->name, wbuff);
1699         } else {
1700                 /* Chop off trailing ';1' from files. */
1701                 if (name_len > 2 && p[name_len - 2] == ';' &&
1702                                 p[name_len - 1] == '1')
1703                         name_len -= 2;
1704                 /* Chop off trailing '.' from filenames. */
1705                 if (name_len > 1 && p[name_len - 1] == '.')
1706                         --name_len;
1707
1708                 archive_strncpy(&file->name, (const char *)p, name_len);
1709         }
1710
1711         flags = isodirrec[DR_flags_offset];
1712         if (flags & 0x02)
1713                 file->mode = AE_IFDIR | 0700;
1714         else
1715                 file->mode = AE_IFREG | 0400;
1716         if (flags & 0x80)
1717                 file->multi_extent = 1;
1718         else
1719                 file->multi_extent = 0;
1720         /*
1721          * Use location for file number.
1722          * File number is treated as inode number to find out harlink
1723          * target. If Rockridge extensions is being used, file number
1724          * will be overwritten by FILE SERIAL NUMBER of RRIP "PX"
1725          * extension.
1726          * NOTE: Old mkisofs did not record that FILE SERIAL NUMBER
1727          * in ISO images.
1728          */
1729         if (file->size == 0 && location >= 0)
1730                 /* If file->size is zero, its location points wrong place.
1731                  * Dot not use it for file number.
1732                  * When location has negative value, it can be used
1733                  * for file number.
1734                  */
1735                 file->number = -1;
1736         else
1737                 file->number = (int64_t)(uint32_t)location;
1738
1739         /* Rockridge extensions overwrite information from above. */
1740         if (iso9660->opt_support_rockridge) {
1741                 if (parent == NULL && rr_end - rr_start >= 7) {
1742                         p = rr_start;
1743                         if (p[0] == 'S' && p[1] == 'P'
1744                             && p[2] == 7 && p[3] == 1
1745                             && p[4] == 0xBE && p[5] == 0xEF) {
1746                                 /*
1747                                  * SP extension stores the suspOffset
1748                                  * (Number of bytes to skip between
1749                                  * filename and SUSP records.)
1750                                  * It is mandatory by the SUSP standard
1751                                  * (IEEE 1281).
1752                                  *
1753                                  * It allows SUSP to coexist with
1754                                  * non-SUSP uses of the System
1755                                  * Use Area by placing non-SUSP data
1756                                  * before SUSP data.
1757                                  *
1758                                  * SP extension must be in the root
1759                                  * directory entry, disable all SUSP
1760                                  * processing if not found.
1761                                  */
1762                                 iso9660->suspOffset = p[6];
1763                                 iso9660->seenSUSP = 1;
1764                                 rr_start += 7;
1765                         }
1766                 }
1767                 if (iso9660->seenSUSP) {
1768                         int r;
1769
1770                         file->name_continues = 0;
1771                         file->symlink_continues = 0;
1772                         rr_start += iso9660->suspOffset;
1773                         r = parse_rockridge(a, file, rr_start, rr_end);
1774                         if (r != ARCHIVE_OK) {
1775                                 free(file);
1776                                 return (NULL);
1777                         }
1778                 } else
1779                         /* If there isn't SUSP, disable parsing
1780                          * rock ridge extensions. */
1781                         iso9660->opt_support_rockridge = 0;
1782         }
1783
1784         file->nlinks = 1;/* Reset nlink. we'll calculate it later. */
1785         /* Tell file's parent how many children that parent has. */
1786         if (parent != NULL && (flags & 0x02))
1787                 parent->subdirs++;
1788
1789         if (iso9660->seenRockridge) {
1790                 if (parent != NULL && parent->parent == NULL &&
1791                     (flags & 0x02) && iso9660->rr_moved == NULL &&
1792                     (strcmp(file->name.s, "rr_moved") == 0 ||
1793                      strcmp(file->name.s, ".rr_moved") == 0)) {
1794                         iso9660->rr_moved = file;
1795                         file->rr_moved = 1;
1796                         file->rr_moved_has_re_only = 1;
1797                         file->re = 0;
1798                         parent->subdirs--;
1799                 } else if (file->re) {
1800                         /* This file's parent is not rr_moved, clear invalid
1801                          * "RE" mark. */
1802                         if (parent == NULL || parent->rr_moved == 0)
1803                                 file->re = 0;
1804                         else if ((flags & 0x02) == 0) {
1805                                 file->rr_moved_has_re_only = 0;
1806                                 file->re = 0;
1807                         }
1808                 } else if (parent != NULL && parent->rr_moved)
1809                         file->rr_moved_has_re_only = 0;
1810                 else if (parent != NULL && (flags & 0x02) &&
1811                     (parent->re || parent->re_descendant))
1812                         file->re_descendant = 1;
1813                 if (file->cl_offset != 0) {
1814                         parent->subdirs++;
1815                         /* Overwrite an offset and a number of this "CL" entry
1816                          * to appear before other dirs. "+1" to those is to
1817                          * make sure to appear after "RE" entry which this
1818                          * "CL" entry should be connected with. */
1819                         file->offset = file->number = file->cl_offset + 1;
1820                 }
1821         }
1822
1823 #if DEBUG
1824         /* DEBUGGING: Warn about attributes I don't yet fully support. */
1825         if ((flags & ~0x02) != 0) {
1826                 fprintf(stderr, "\n ** Unrecognized flag: ");
1827                 dump_isodirrec(stderr, isodirrec);
1828                 fprintf(stderr, "\n");
1829         } else if (toi(isodirrec + DR_volume_sequence_number_offset, 2) != 1) {
1830                 fprintf(stderr, "\n ** Unrecognized sequence number: ");
1831                 dump_isodirrec(stderr, isodirrec);
1832                 fprintf(stderr, "\n");
1833         } else if (*(isodirrec + DR_file_unit_size_offset) != 0) {
1834                 fprintf(stderr, "\n ** Unexpected file unit size: ");
1835                 dump_isodirrec(stderr, isodirrec);
1836                 fprintf(stderr, "\n");
1837         } else if (*(isodirrec + DR_interleave_offset) != 0) {
1838                 fprintf(stderr, "\n ** Unexpected interleave: ");
1839                 dump_isodirrec(stderr, isodirrec);
1840                 fprintf(stderr, "\n");
1841         } else if (*(isodirrec + DR_ext_attr_length_offset) != 0) {
1842                 fprintf(stderr, "\n ** Unexpected extended attribute length: ");
1843                 dump_isodirrec(stderr, isodirrec);
1844                 fprintf(stderr, "\n");
1845         }
1846 #endif
1847         register_file(iso9660, file);
1848         return (file);
1849 }
1850
1851 static int
1852 parse_rockridge(struct archive_read *a, struct file_info *file,
1853     const unsigned char *p, const unsigned char *end)
1854 {
1855         struct iso9660 *iso9660;
1856
1857         iso9660 = (struct iso9660 *)(a->format->data);
1858
1859         while (p + 4 <= end  /* Enough space for another entry. */
1860             && p[0] >= 'A' && p[0] <= 'Z' /* Sanity-check 1st char of name. */
1861             && p[1] >= 'A' && p[1] <= 'Z' /* Sanity-check 2nd char of name. */
1862             && p[2] >= 4 /* Sanity-check length. */
1863             && p + p[2] <= end) { /* Sanity-check length. */
1864                 const unsigned char *data = p + 4;
1865                 int data_length = p[2] - 4;
1866                 int version = p[3];
1867
1868                 /*
1869                  * Yes, each 'if' here does test p[0] again.
1870                  * Otherwise, the fall-through handling to catch
1871                  * unsupported extensions doesn't work.
1872                  */
1873                 switch(p[0]) {
1874                 case 'C':
1875                         if (p[0] == 'C' && p[1] == 'E') {
1876                                 if (version == 1 && data_length == 24) {
1877                                         /*
1878                                          * CE extension comprises:
1879                                          *   8 byte sector containing extension
1880                                          *   8 byte offset w/in above sector
1881                                          *   8 byte length of continuation
1882                                          */
1883                                         int32_t location =
1884                                             archive_le32dec(data);
1885                                         file->ce_offset =
1886                                             archive_le32dec(data+8);
1887                                         file->ce_size =
1888                                             archive_le32dec(data+16);
1889                                         if (register_CE(a, location, file)
1890                                             != ARCHIVE_OK)
1891                                                 return (ARCHIVE_FATAL);
1892                                 }
1893                                 break;
1894                         }
1895                         if (p[0] == 'C' && p[1] == 'L') {
1896                                 if (version == 1 && data_length == 8) {
1897                                         file->cl_offset = (uint64_t)
1898                                             iso9660->logical_block_size *
1899                                             (uint64_t)archive_le32dec(data);
1900                                         iso9660->seenRockridge = 1;
1901                                 }
1902                                 break;
1903                         }
1904                         /* FALLTHROUGH */
1905                 case 'N':
1906                         if (p[0] == 'N' && p[1] == 'M') {
1907                                 if (version == 1) {
1908                                         parse_rockridge_NM1(file,
1909                                             data, data_length);
1910                                         iso9660->seenRockridge = 1;
1911                                 }
1912                                 break;
1913                         }
1914                         /* FALLTHROUGH */
1915                 case 'P':
1916                         if (p[0] == 'P' && p[1] == 'D') {
1917                                 /*
1918                                  * PD extension is padding;
1919                                  * contents are always ignored.
1920                                  */
1921                                 break;
1922                         }
1923                         if (p[0] == 'P' && p[1] == 'N') {
1924                                 if (version == 1 && data_length == 16) {
1925                                         file->rdev = toi(data,4);
1926                                         file->rdev <<= 32;
1927                                         file->rdev |= toi(data + 8, 4);
1928                                         iso9660->seenRockridge = 1;
1929                                 }
1930                                 break;
1931                         }
1932                         if (p[0] == 'P' && p[1] == 'X') {
1933                                 /*
1934                                  * PX extension comprises:
1935                                  *   8 bytes for mode,
1936                                  *   8 bytes for nlinks,
1937                                  *   8 bytes for uid,
1938                                  *   8 bytes for gid,
1939                                  *   8 bytes for inode.
1940                                  */
1941                                 if (version == 1) {
1942                                         if (data_length >= 8)
1943                                                 file->mode
1944                                                     = toi(data, 4);
1945                                         if (data_length >= 16)
1946                                                 file->nlinks
1947                                                     = toi(data + 8, 4);
1948                                         if (data_length >= 24)
1949                                                 file->uid
1950                                                     = toi(data + 16, 4);
1951                                         if (data_length >= 32)
1952                                                 file->gid
1953                                                     = toi(data + 24, 4);
1954                                         if (data_length >= 40)
1955                                                 file->number
1956                                                     = toi(data + 32, 4);
1957                                         iso9660->seenRockridge = 1;
1958                                 }
1959                                 break;
1960                         }
1961                         /* FALLTHROUGH */
1962                 case 'R':
1963                         if (p[0] == 'R' && p[1] == 'E' && version == 1) {
1964                                 file->re = 1;
1965                                 iso9660->seenRockridge = 1;
1966                                 break;
1967                         }
1968                         if (p[0] == 'R' && p[1] == 'R' && version == 1) {
1969                                 /*
1970                                  * RR extension comprises:
1971                                  *    one byte flag value
1972                                  * This extension is obsolete,
1973                                  * so contents are always ignored.
1974                                  */
1975                                 break;
1976                         }
1977                         /* FALLTHROUGH */
1978                 case 'S':
1979                         if (p[0] == 'S' && p[1] == 'L') {
1980                                 if (version == 1) {
1981                                         parse_rockridge_SL1(file,
1982                                             data, data_length);
1983                                         iso9660->seenRockridge = 1;
1984                                 }
1985                                 break;
1986                         }
1987                         if (p[0] == 'S' && p[1] == 'T'
1988                             && data_length == 0 && version == 1) {
1989                                 /*
1990                                  * ST extension marks end of this
1991                                  * block of SUSP entries.
1992                                  *
1993                                  * It allows SUSP to coexist with
1994                                  * non-SUSP uses of the System
1995                                  * Use Area by placing non-SUSP data
1996                                  * after SUSP data.
1997                                  */
1998                                 iso9660->seenSUSP = 0;
1999                                 iso9660->seenRockridge = 0;
2000                                 return (ARCHIVE_OK);
2001                         }
2002                 case 'T':
2003                         if (p[0] == 'T' && p[1] == 'F') {
2004                                 if (version == 1) {
2005                                         parse_rockridge_TF1(file,
2006                                             data, data_length);
2007                                         iso9660->seenRockridge = 1;
2008                                 }
2009                                 break;
2010                         }
2011                         /* FALLTHROUGH */
2012                 case 'Z':
2013                         if (p[0] == 'Z' && p[1] == 'F') {
2014                                 if (version == 1)
2015                                         parse_rockridge_ZF1(file,
2016                                             data, data_length);
2017                                 break;
2018                         }
2019                         /* FALLTHROUGH */
2020                 default:
2021                         /* The FALLTHROUGHs above leave us here for
2022                          * any unsupported extension. */
2023                         break;
2024                 }
2025
2026
2027
2028                 p += p[2];
2029         }
2030         return (ARCHIVE_OK);
2031 }
2032
2033 static int
2034 register_CE(struct archive_read *a, int32_t location,
2035     struct file_info *file)
2036 {
2037         struct iso9660 *iso9660;
2038         struct read_ce_queue *heap;
2039         struct read_ce_req *p;
2040         uint64_t offset, parent_offset;
2041         int hole, parent;
2042
2043         iso9660 = (struct iso9660 *)(a->format->data);
2044         offset = ((uint64_t)location) * (uint64_t)iso9660->logical_block_size;
2045         if (((file->mode & AE_IFMT) == AE_IFREG &&
2046             offset >= file->offset) ||
2047             offset < iso9660->current_position) {
2048                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2049                     "Invalid location in SUSP \"CE\" extension");
2050                 return (ARCHIVE_FATAL);
2051         }
2052
2053         /* Expand our CE list as necessary. */
2054         heap = &(iso9660->read_ce_req);
2055         if (heap->cnt >= heap->allocated) {
2056                 int new_size;
2057
2058                 if (heap->allocated < 16)
2059                         new_size = 16;
2060                 else
2061                         new_size = heap->allocated * 2;
2062                 /* Overflow might keep us from growing the list. */
2063                 if (new_size <= heap->allocated)
2064                         __archive_errx(1, "Out of memory");
2065                 p = malloc(new_size * sizeof(p[0]));
2066                 if (p == NULL)
2067                         __archive_errx(1, "Out of memory");
2068                 if (heap->reqs != NULL) {
2069                         memcpy(p, heap->reqs, heap->cnt * sizeof(*p));
2070                         free(heap->reqs);
2071                 }
2072                 heap->reqs = p;
2073                 heap->allocated = new_size;
2074         }
2075
2076         /*
2077          * Start with hole at end, walk it up tree to find insertion point.
2078          */
2079         hole = heap->cnt++;
2080         while (hole > 0) {
2081                 parent = (hole - 1)/2;
2082                 parent_offset = heap->reqs[parent].offset;
2083                 if (offset >= parent_offset) {
2084                         heap->reqs[hole].offset = offset;
2085                         heap->reqs[hole].file = file;
2086                         return (ARCHIVE_OK);
2087                 }
2088                 // Move parent into hole <==> move hole up tree.
2089                 heap->reqs[hole] = heap->reqs[parent];
2090                 hole = parent;
2091         }
2092         heap->reqs[0].offset = offset;
2093         heap->reqs[0].file = file;
2094         return (ARCHIVE_OK);
2095 }
2096
2097 static void
2098 next_CE(struct read_ce_queue *heap)
2099 {
2100         uint64_t a_offset, b_offset, c_offset;
2101         int a, b, c;
2102         struct read_ce_req tmp;
2103
2104         if (heap->cnt < 1)
2105                 return;
2106
2107         /*
2108          * Move the last item in the heap to the root of the tree
2109          */
2110         heap->reqs[0] = heap->reqs[--(heap->cnt)];
2111
2112         /*
2113          * Rebalance the heap.
2114          */
2115         a = 0; // Starting element and its offset
2116         a_offset = heap->reqs[a].offset;
2117         for (;;) {
2118                 b = a + a + 1; // First child
2119                 if (b >= heap->cnt)
2120                         return;
2121                 b_offset = heap->reqs[b].offset;
2122                 c = b + 1; // Use second child if it is smaller.
2123                 if (c < heap->cnt) {
2124                         c_offset = heap->reqs[c].offset;
2125                         if (c_offset < b_offset) {
2126                                 b = c;
2127                                 b_offset = c_offset;
2128                         }
2129                 }
2130                 if (a_offset <= b_offset)
2131                         return;
2132                 tmp = heap->reqs[a];
2133                 heap->reqs[a] = heap->reqs[b];
2134                 heap->reqs[b] = tmp;
2135                 a = b;
2136         }
2137 }
2138
2139
2140 static int
2141 read_CE(struct archive_read *a, struct iso9660 *iso9660)
2142 {
2143         struct read_ce_queue *heap;
2144         const unsigned char *b, *p, *end;
2145         struct file_info *file;
2146         size_t step;
2147         int r;
2148
2149         /* Read data which RRIP "CE" extension points. */
2150         heap = &(iso9660->read_ce_req);
2151         step = iso9660->logical_block_size;
2152         while (heap->cnt &&
2153             heap->reqs[0].offset == iso9660->current_position) {
2154                 b = __archive_read_ahead(a, step, NULL);
2155                 if (b == NULL) {
2156                         archive_set_error(&a->archive,
2157                             ARCHIVE_ERRNO_MISC,
2158                             "Failed to read full block when scanning "
2159                             "ISO9660 directory list");
2160                         return (ARCHIVE_FATAL);
2161                 }
2162                 do {
2163                         file = heap->reqs[0].file;
2164                         p = b + file->ce_offset;
2165                         end = p + file->ce_size;
2166                         next_CE(heap);
2167                         r = parse_rockridge(a, file, p, end);
2168                         if (r != ARCHIVE_OK)
2169                                 return (ARCHIVE_FATAL);
2170                 } while (heap->cnt &&
2171                     heap->reqs[0].offset == iso9660->current_position);
2172                 /* NOTE: Do not move this consume's code to fron of
2173                  * do-while loop. Registration of nested CE extension
2174                  * might cause error because of current position. */
2175                 __archive_read_consume(a, step);
2176                 iso9660->current_position += step;
2177         }
2178         return (ARCHIVE_OK);
2179 }
2180
2181 static void
2182 parse_rockridge_NM1(struct file_info *file,
2183                     const unsigned char *data, int data_length)
2184 {
2185         if (!file->name_continues)
2186                 archive_string_empty(&file->name);
2187         file->name_continues = 0;
2188         if (data_length < 1)
2189                 return;
2190         /*
2191          * NM version 1 extension comprises:
2192          *   1 byte flag, value is one of:
2193          *     = 0: remainder is name
2194          *     = 1: remainder is name, next NM entry continues name
2195          *     = 2: "."
2196          *     = 4: ".."
2197          *     = 32: Implementation specific
2198          *     All other values are reserved.
2199          */
2200         switch(data[0]) {
2201         case 0:
2202                 if (data_length < 2)
2203                         return;
2204                 archive_strncat(&file->name, (const char *)data + 1, data_length - 1);
2205                 break;
2206         case 1:
2207                 if (data_length < 2)
2208                         return;
2209                 archive_strncat(&file->name, (const char *)data + 1, data_length - 1);
2210                 file->name_continues = 1;
2211                 break;
2212         case 2:
2213                 archive_strcat(&file->name, ".");
2214                 break;
2215         case 4:
2216                 archive_strcat(&file->name, "..");
2217                 break;
2218         default:
2219                 return;
2220         }
2221
2222 }
2223
2224 static void
2225 parse_rockridge_TF1(struct file_info *file, const unsigned char *data,
2226     int data_length)
2227 {
2228         char flag;
2229         /*
2230          * TF extension comprises:
2231          *   one byte flag
2232          *   create time (optional)
2233          *   modify time (optional)
2234          *   access time (optional)
2235          *   attribute time (optional)
2236          *  Time format and presence of fields
2237          *  is controlled by flag bits.
2238          */
2239         if (data_length < 1)
2240                 return;
2241         flag = data[0];
2242         ++data;
2243         --data_length;
2244         if (flag & 0x80) {
2245                 /* Use 17-byte time format. */
2246                 if ((flag & 1) && data_length >= 17) {
2247                         /* Create time. */
2248                         file->birthtime_is_set = 1;
2249                         file->birthtime = isodate17(data);
2250                         data += 17;
2251                         data_length -= 17;
2252                 }
2253                 if ((flag & 2) && data_length >= 17) {
2254                         /* Modify time. */
2255                         file->mtime = isodate17(data);
2256                         data += 17;
2257                         data_length -= 17;
2258                 }
2259                 if ((flag & 4) && data_length >= 17) {
2260                         /* Access time. */
2261                         file->atime = isodate17(data);
2262                         data += 17;
2263                         data_length -= 17;
2264                 }
2265                 if ((flag & 8) && data_length >= 17) {
2266                         /* Attribute change time. */
2267                         file->ctime = isodate17(data);
2268                 }
2269         } else {
2270                 /* Use 7-byte time format. */
2271                 if ((flag & 1) && data_length >= 7) {
2272                         /* Create time. */
2273                         file->birthtime_is_set = 1;
2274                         file->birthtime = isodate7(data);
2275                         data += 7;
2276                         data_length -= 7;
2277                 }
2278                 if ((flag & 2) && data_length >= 7) {
2279                         /* Modify time. */
2280                         file->mtime = isodate7(data);
2281                         data += 7;
2282                         data_length -= 7;
2283                 }
2284                 if ((flag & 4) && data_length >= 7) {
2285                         /* Access time. */
2286                         file->atime = isodate7(data);
2287                         data += 7;
2288                         data_length -= 7;
2289                 }
2290                 if ((flag & 8) && data_length >= 7) {
2291                         /* Attribute change time. */
2292                         file->ctime = isodate7(data);
2293                 }
2294         }
2295 }
2296
2297 static void
2298 parse_rockridge_SL1(struct file_info *file, const unsigned char *data,
2299     int data_length)
2300 {
2301         const char *separator = "";
2302
2303         if (!file->symlink_continues || file->symlink.length < 1)
2304                 archive_string_empty(&file->symlink);
2305         else if (!file->symlink_continues &&
2306             file->symlink.s[file->symlink.length - 1] != '/')
2307                 separator = "/";
2308         file->symlink_continues = 0;
2309
2310         /*
2311          * Defined flag values:
2312          *  0: This is the last SL record for this symbolic link
2313          *  1: this symbolic link field continues in next SL entry
2314          *  All other values are reserved.
2315          */
2316         if (data_length < 1)
2317                 return;
2318         switch(*data) {
2319         case 0:
2320                 break;
2321         case 1:
2322                 file->symlink_continues = 1;
2323                 break;
2324         default:
2325                 return;
2326         }
2327         ++data;  /* Skip flag byte. */
2328         --data_length;
2329
2330         /*
2331          * SL extension body stores "components".
2332          * Basically, this is a complicated way of storing
2333          * a POSIX path.  It also interferes with using
2334          * symlinks for storing non-path data. <sigh>
2335          *
2336          * Each component is 2 bytes (flag and length)
2337          * possibly followed by name data.
2338          */
2339         while (data_length >= 2) {
2340                 unsigned char flag = *data++;
2341                 unsigned char nlen = *data++;
2342                 data_length -= 2;
2343
2344                 archive_strcat(&file->symlink, separator);
2345                 separator = "/";
2346
2347                 switch(flag) {
2348                 case 0: /* Usual case, this is text. */
2349                         if (data_length < nlen)
2350                                 return;
2351                         archive_strncat(&file->symlink,
2352                             (const char *)data, nlen);
2353                         break;
2354                 case 0x01: /* Text continues in next component. */
2355                         if (data_length < nlen)
2356                                 return;
2357                         archive_strncat(&file->symlink,
2358                             (const char *)data, nlen);
2359                         separator = "";
2360                         break;
2361                 case 0x02: /* Current dir. */
2362                         archive_strcat(&file->symlink, ".");
2363                         break;
2364                 case 0x04: /* Parent dir. */
2365                         archive_strcat(&file->symlink, "..");
2366                         break;
2367                 case 0x08: /* Root of filesystem. */
2368                         archive_strcat(&file->symlink, "/");
2369                         separator = "";
2370                         break;
2371                 case 0x10: /* Undefined (historically "volume root" */
2372                         archive_string_empty(&file->symlink);
2373                         archive_strcat(&file->symlink, "ROOT");
2374                         break;
2375                 case 0x20: /* Undefined (historically "hostname") */
2376                         archive_strcat(&file->symlink, "hostname");
2377                         break;
2378                 default:
2379                         /* TODO: issue a warning ? */
2380                         return;
2381                 }
2382                 data += nlen;
2383                 data_length -= nlen;
2384         }
2385 }
2386
2387 static void
2388 parse_rockridge_ZF1(struct file_info *file, const unsigned char *data,
2389     int data_length)
2390 {
2391
2392         if (data[0] == 0x70 && data[1] == 0x7a && data_length == 12) {
2393                 /* paged zlib */
2394                 file->pz = 1;
2395                 file->pz_log2_bs = data[3];
2396                 file->pz_uncompressed_size = archive_le32dec(&data[4]);
2397         }
2398 }
2399
2400 static void
2401 register_file(struct iso9660 *iso9660, struct file_info *file)
2402 {
2403
2404         file->use_next = iso9660->use_files;
2405         iso9660->use_files = file;
2406 }
2407
2408 static void
2409 release_files(struct iso9660 *iso9660)
2410 {
2411         struct content *con, *connext;
2412         struct file_info *file;
2413
2414         file = iso9660->use_files;
2415         while (file != NULL) {
2416                 struct file_info *next = file->use_next;
2417
2418                 archive_string_free(&file->name);
2419                 archive_string_free(&file->symlink);
2420                 con = file->contents.first;
2421                 while (con != NULL) {
2422                         connext = con->next;
2423                         free(con);
2424                         con = connext;
2425                 }
2426                 free(file);
2427                 file = next;
2428         }
2429 }
2430
2431 static int
2432 next_entry_seek(struct archive_read *a, struct iso9660 *iso9660,
2433     struct file_info **pfile)
2434 {
2435         struct file_info *file;
2436         int r;
2437
2438         r = next_cache_entry(a, iso9660, pfile);
2439         if (r != ARCHIVE_OK)
2440                 return (r);
2441         file = *pfile;
2442
2443         /* Don't waste time seeking for zero-length bodies. */
2444         if (file->size == 0)
2445                 file->offset = iso9660->current_position;
2446
2447         /* Seek forward to the start of the entry. */
2448         if (iso9660->current_position < file->offset) {
2449                 int64_t step;
2450
2451                 step = file->offset - iso9660->current_position;
2452                 step = __archive_read_skip(a, step);
2453                 if (step < 0)
2454                         return ((int)step);
2455                 iso9660->current_position = file->offset;
2456         }
2457
2458         /* We found body of file; handle it now. */
2459         return (ARCHIVE_OK);
2460 }
2461
2462 static int
2463 next_cache_entry(struct archive_read *a, struct iso9660 *iso9660,
2464     struct file_info **pfile)
2465 {
2466         struct file_info *file;
2467         struct {
2468                 struct file_info        *first;
2469                 struct file_info        **last;
2470         }       empty_files;
2471         int64_t number;
2472         int count;
2473
2474         file = cache_get_entry(iso9660);
2475         if (file != NULL) {
2476                 *pfile = file;
2477                 return (ARCHIVE_OK);
2478         }
2479
2480         for (;;) {
2481                 struct file_info *re, *d;
2482
2483                 *pfile = file = next_entry(iso9660);
2484                 if (file == NULL) {
2485                         /*
2486                          * If directory entries all which are descendant of
2487                          * rr_moved are stil remaning, expose their.
2488                          */
2489                         if (iso9660->re_files.first != NULL &&
2490                             iso9660->rr_moved != NULL &&
2491                             iso9660->rr_moved->rr_moved_has_re_only)
2492                                 /* Expose "rr_moved" entry. */
2493                                 cache_add_entry(iso9660, iso9660->rr_moved);
2494                         while ((re = re_get_entry(iso9660)) != NULL) {
2495                                 /* Expose its descendant dirs. */
2496                                 while ((d = rede_get_entry(re)) != NULL)
2497                                         cache_add_entry(iso9660, d);
2498                         }
2499                         if (iso9660->cache_files.first != NULL)
2500                                 return (next_cache_entry(a, iso9660, pfile));
2501                         return (ARCHIVE_EOF);
2502                 }
2503
2504                 if (file->cl_offset) {
2505                         struct file_info *first_re = NULL;
2506                         int nexted_re = 0;
2507
2508                         /*
2509                          * Find "RE" dir for the current file, which
2510                          * has "CL" flag.
2511                          */
2512                         while ((re = re_get_entry(iso9660))
2513                             != first_re) {
2514                                 if (first_re == NULL)
2515                                         first_re = re;
2516                                 if (re->offset == file->cl_offset) {
2517                                         re->parent->subdirs--;
2518                                         re->parent = file->parent;
2519                                         re->re = 0;
2520                                         if (re->parent->re_descendant) {
2521                                                 nexted_re = 1;
2522                                                 re->re_descendant = 1;
2523                                                 if (rede_add_entry(re) < 0)
2524                                                         goto fatal_rr;
2525                                                 /* Move a list of descendants
2526                                                  * to a new ancestor. */
2527                                                 while ((d = rede_get_entry(
2528                                                     re)) != NULL)
2529                                                         if (rede_add_entry(d)
2530                                                             < 0)
2531                                                                 goto fatal_rr;
2532                                                 break;
2533                                         }
2534                                         /* Replace the current file
2535                                          * with "RE" dir */
2536                                         *pfile = file = re;
2537                                         /* Expose its descendant */
2538                                         while ((d = rede_get_entry(
2539                                             file)) != NULL)
2540                                                 cache_add_entry(
2541                                                     iso9660, d);
2542                                         break;
2543                                 } else
2544                                         re_add_entry(iso9660, re);
2545                         }
2546                         if (nexted_re) {
2547                                 /*
2548                                  * Do not expose this at this time
2549                                  * because we have not gotten its full-path
2550                                  * name yet.
2551                                  */
2552                                 continue;
2553                         }
2554                 } else if ((file->mode & AE_IFMT) == AE_IFDIR) {
2555                         int r;
2556
2557                         /* Read file entries in this dir. */
2558                         r = read_children(a, file);
2559                         if (r != ARCHIVE_OK)
2560                                 return (r);
2561
2562                         /*
2563                          * Handle a special dir of Rockridge extensions,
2564                          * "rr_moved".
2565                          */
2566                         if (file->rr_moved) {
2567                                 /*
2568                                  * If this has only the subdirectories which
2569                                  * have "RE" flags, do not expose at this time.
2570                                  */
2571                                 if (file->rr_moved_has_re_only)
2572                                         continue;
2573                                 /* Otherwise expose "rr_moved" entry. */
2574                         } else if (file->re) {
2575                                 /*
2576                                  * Do not expose this at this time
2577                                  * because we have not gotten its full-path
2578                                  * name yet.
2579                                  */
2580                                 re_add_entry(iso9660, file);
2581                                 continue;
2582                         } else if (file->re_descendant) {
2583                                 /*
2584                                  * If the top level "RE" entry of this entry
2585                                  * is not exposed, we, accordingly, should not
2586                                  * expose this entry at this time because
2587                                  * we cannot make its proper full-path name.
2588                                  */
2589                                 if (rede_add_entry(file) == 0)
2590                                         continue;
2591                                 /* Otherwise we can expose this entry because
2592                                  * it seems its top level "RE" has already been
2593                                  * exposed. */
2594                         }
2595                 }
2596                 break;
2597         }
2598
2599         if ((file->mode & AE_IFMT) != AE_IFREG || file->number == -1)
2600                 return (ARCHIVE_OK);
2601
2602         count = 0;
2603         number = file->number;
2604         iso9660->cache_files.first = NULL;
2605         iso9660->cache_files.last = &(iso9660->cache_files.first);
2606         empty_files.first = NULL;
2607         empty_files.last = &empty_files.first;
2608         /* Collect files which has the same file serial number.
2609          * Peek pending_files so that file which number is different
2610          * is not put bak. */
2611         while (iso9660->pending_files.used > 0 &&
2612             (iso9660->pending_files.files[0]->number == -1 ||
2613              iso9660->pending_files.files[0]->number == number)) {
2614                 if (file->number == -1) {
2615                         /* This file has the same offset
2616                          * but it's wrong offset which empty files
2617                          * and symlink files have.
2618                          * NOTE: This wrong offse was recorded by
2619                          * old mkisofs utility. If ISO images is
2620                          * created by latest mkisofs, this does not
2621                          * happen.
2622                          */
2623                         file->next = NULL;
2624                         *empty_files.last = file;
2625                         empty_files.last = &(file->next);
2626                 } else {
2627                         count++;
2628                         cache_add_entry(iso9660, file);
2629                 }
2630                 file = next_entry(iso9660);
2631         }
2632
2633         if (count == 0) {
2634                 *pfile = file;
2635                 return ((file == NULL)?ARCHIVE_EOF:ARCHIVE_OK);
2636         }
2637         if (file->number == -1) {
2638                 file->next = NULL;
2639                 *empty_files.last = file;
2640                 empty_files.last = &(file->next);
2641         } else {
2642                 count++;
2643                 cache_add_entry(iso9660, file);
2644         }
2645
2646         if (count > 1) {
2647                 /* The count is the same as number of hardlink,
2648                  * so much so that each nlinks of files in cache_file
2649                  * is overwritten by value of the count.
2650                  */
2651                 for (file = iso9660->cache_files.first;
2652                     file != NULL; file = file->next)
2653                         file->nlinks = count;
2654         }
2655         /* If there are empty files, that files are added
2656          * to the tail of the cache_files. */
2657         if (empty_files.first != NULL) {
2658                 *iso9660->cache_files.last = empty_files.first;
2659                 iso9660->cache_files.last = empty_files.last;
2660         }
2661         *pfile = cache_get_entry(iso9660);
2662         return ((*pfile == NULL)?ARCHIVE_EOF:ARCHIVE_OK);
2663
2664 fatal_rr:
2665         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2666             "Failed to connect 'CL' pointer to 'RE' rr_moved pointer of"
2667             "Rockridge extensions");
2668         return (ARCHIVE_FATAL);
2669 }
2670
2671 static inline void
2672 re_add_entry(struct iso9660 *iso9660, struct file_info *file)
2673 {
2674         file->re_next = NULL;
2675         *iso9660->re_files.last = file;
2676         iso9660->re_files.last = &(file->re_next);
2677 }
2678
2679 static inline struct file_info *
2680 re_get_entry(struct iso9660 *iso9660)
2681 {
2682         struct file_info *file;
2683
2684         if ((file = iso9660->re_files.first) != NULL) {
2685                 iso9660->re_files.first = file->re_next;
2686                 if (iso9660->re_files.first == NULL)
2687                         iso9660->re_files.last =
2688                             &(iso9660->re_files.first);
2689         }
2690         return (file);
2691 }
2692
2693 static inline int
2694 rede_add_entry(struct file_info *file)
2695 {
2696         struct file_info *re;
2697
2698         re = file->parent;
2699         while (re != NULL && !re->re)
2700                 re = re->parent;
2701         if (re == NULL)
2702                 return (-1);
2703
2704         file->re_next = NULL;
2705         *re->rede_files.last = file;
2706         re->rede_files.last = &(file->re_next);
2707         return (0);
2708 }
2709
2710 static inline struct file_info *
2711 rede_get_entry(struct file_info *re)
2712 {
2713         struct file_info *file;
2714
2715         if ((file = re->rede_files.first) != NULL) {
2716                 re->rede_files.first = file->re_next;
2717                 if (re->rede_files.first == NULL)
2718                         re->rede_files.last =
2719                             &(re->rede_files.first);
2720         }
2721         return (file);
2722 }
2723
2724 static inline void
2725 cache_add_entry(struct iso9660 *iso9660, struct file_info *file)
2726 {
2727         file->next = NULL;
2728         *iso9660->cache_files.last = file;
2729         iso9660->cache_files.last = &(file->next);
2730 }
2731
2732 static inline struct file_info *
2733 cache_get_entry(struct iso9660 *iso9660)
2734 {
2735         struct file_info *file;
2736
2737         if ((file = iso9660->cache_files.first) != NULL) {
2738                 iso9660->cache_files.first = file->next;
2739                 if (iso9660->cache_files.first == NULL)
2740                         iso9660->cache_files.last = &(iso9660->cache_files.first);
2741         }
2742         return (file);
2743 }
2744
2745 static void
2746 heap_add_entry(struct heap_queue *heap, struct file_info *file, uint64_t key)
2747 {
2748         uint64_t file_key, parent_key;
2749         int hole, parent;
2750
2751         /* Expand our pending files list as necessary. */
2752         if (heap->used >= heap->allocated) {
2753                 struct file_info **new_pending_files;
2754                 int new_size = heap->allocated * 2;
2755
2756                 if (heap->allocated < 1024)
2757                         new_size = 1024;
2758                 /* Overflow might keep us from growing the list. */
2759                 if (new_size <= heap->allocated)
2760                         __archive_errx(1, "Out of memory");
2761                 new_pending_files = (struct file_info **)
2762                     malloc(new_size * sizeof(new_pending_files[0]));
2763                 if (new_pending_files == NULL)
2764                         __archive_errx(1, "Out of memory");
2765                 memcpy(new_pending_files, heap->files,
2766                     heap->allocated * sizeof(new_pending_files[0]));
2767                 if (heap->files != NULL)
2768                         free(heap->files);
2769                 heap->files = new_pending_files;
2770                 heap->allocated = new_size;
2771         }
2772
2773         file_key = file->key = key;
2774
2775         /*
2776          * Start with hole at end, walk it up tree to find insertion point.
2777          */
2778         hole = heap->used++;
2779         while (hole > 0) {
2780                 parent = (hole - 1)/2;
2781                 parent_key = heap->files[parent]->key;
2782                 if (file_key >= parent_key) {
2783                         heap->files[hole] = file;
2784                         return;
2785                 }
2786                 // Move parent into hole <==> move hole up tree.
2787                 heap->files[hole] = heap->files[parent];
2788                 hole = parent;
2789         }
2790         heap->files[0] = file;
2791 }
2792
2793 static struct file_info *
2794 heap_get_entry(struct heap_queue *heap)
2795 {
2796         uint64_t a_key, b_key, c_key;
2797         int a, b, c;
2798         struct file_info *r, *tmp;
2799
2800         if (heap->used < 1)
2801                 return (NULL);
2802
2803         /*
2804          * The first file in the list is the earliest; we'll return this.
2805          */
2806         r = heap->files[0];
2807
2808         /*
2809          * Move the last item in the heap to the root of the tree
2810          */
2811         heap->files[0] = heap->files[--(heap->used)];
2812
2813         /*
2814          * Rebalance the heap.
2815          */
2816         a = 0; // Starting element and its heap key
2817         a_key = heap->files[a]->key;
2818         for (;;) {
2819                 b = a + a + 1; // First child
2820                 if (b >= heap->used)
2821                         return (r);
2822                 b_key = heap->files[b]->key;
2823                 c = b + 1; // Use second child if it is smaller.
2824                 if (c < heap->used) {
2825                         c_key = heap->files[c]->key;
2826                         if (c_key < b_key) {
2827                                 b = c;
2828                                 b_key = c_key;
2829                         }
2830                 }
2831                 if (a_key <= b_key)
2832                         return (r);
2833                 tmp = heap->files[a];
2834                 heap->files[a] = heap->files[b];
2835                 heap->files[b] = tmp;
2836                 a = b;
2837         }
2838 }
2839
2840 static unsigned int
2841 toi(const void *p, int n)
2842 {
2843         const unsigned char *v = (const unsigned char *)p;
2844         if (n > 1)
2845                 return v[0] + 256 * toi(v + 1, n - 1);
2846         if (n == 1)
2847                 return v[0];
2848         return (0);
2849 }
2850
2851 static time_t
2852 isodate7(const unsigned char *v)
2853 {
2854         struct tm tm;
2855         int offset;
2856         memset(&tm, 0, sizeof(tm));
2857         tm.tm_year = v[0];
2858         tm.tm_mon = v[1] - 1;
2859         tm.tm_mday = v[2];
2860         tm.tm_hour = v[3];
2861         tm.tm_min = v[4];
2862         tm.tm_sec = v[5];
2863         /* v[6] is the signed timezone offset, in 1/4-hour increments. */
2864         offset = ((const signed char *)v)[6];
2865         if (offset > -48 && offset < 52) {
2866                 tm.tm_hour -= offset / 4;
2867                 tm.tm_min -= (offset % 4) * 15;
2868         }
2869         return (time_from_tm(&tm));
2870 }
2871
2872 static time_t
2873 isodate17(const unsigned char *v)
2874 {
2875         struct tm tm;
2876         int offset;
2877         memset(&tm, 0, sizeof(tm));
2878         tm.tm_year = (v[0] - '0') * 1000 + (v[1] - '0') * 100
2879             + (v[2] - '0') * 10 + (v[3] - '0')
2880             - 1900;
2881         tm.tm_mon = (v[4] - '0') * 10 + (v[5] - '0');
2882         tm.tm_mday = (v[6] - '0') * 10 + (v[7] - '0');
2883         tm.tm_hour = (v[8] - '0') * 10 + (v[9] - '0');
2884         tm.tm_min = (v[10] - '0') * 10 + (v[11] - '0');
2885         tm.tm_sec = (v[12] - '0') * 10 + (v[13] - '0');
2886         /* v[16] is the signed timezone offset, in 1/4-hour increments. */
2887         offset = ((const signed char *)v)[16];
2888         if (offset > -48 && offset < 52) {
2889                 tm.tm_hour -= offset / 4;
2890                 tm.tm_min -= (offset % 4) * 15;
2891         }
2892         return (time_from_tm(&tm));
2893 }
2894
2895 static time_t
2896 time_from_tm(struct tm *t)
2897 {
2898 #if HAVE_TIMEGM
2899         /* Use platform timegm() if available. */
2900         return (timegm(t));
2901 #else
2902         /* Else use direct calculation using POSIX assumptions. */
2903         /* First, fix up tm_yday based on the year/month/day. */
2904         mktime(t);
2905         /* Then we can compute timegm() from first principles. */
2906         return (t->tm_sec + t->tm_min * 60 + t->tm_hour * 3600
2907             + t->tm_yday * 86400 + (t->tm_year - 70) * 31536000
2908             + ((t->tm_year - 69) / 4) * 86400 -
2909             ((t->tm_year - 1) / 100) * 86400
2910             + ((t->tm_year + 299) / 400) * 86400);
2911 #endif
2912 }
2913
2914 static const char *
2915 build_pathname(struct archive_string *as, struct file_info *file)
2916 {
2917         if (file->parent != NULL && archive_strlen(&file->parent->name) > 0) {
2918                 build_pathname(as, file->parent);
2919                 archive_strcat(as, "/");
2920         }
2921         if (archive_strlen(&file->name) == 0)
2922                 archive_strcat(as, ".");
2923         else
2924                 archive_string_concat(as, &file->name);
2925         return (as->s);
2926 }
2927
2928 #if DEBUG
2929 static void
2930 dump_isodirrec(FILE *out, const unsigned char *isodirrec)
2931 {
2932         fprintf(out, " l %d,",
2933             toi(isodirrec + DR_length_offset, DR_length_size));
2934         fprintf(out, " a %d,",
2935             toi(isodirrec + DR_ext_attr_length_offset, DR_ext_attr_length_size));
2936         fprintf(out, " ext 0x%x,",
2937             toi(isodirrec + DR_extent_offset, DR_extent_size));
2938         fprintf(out, " s %d,",
2939             toi(isodirrec + DR_size_offset, DR_extent_size));
2940         fprintf(out, " f 0x%02x,",
2941             toi(isodirrec + DR_flags_offset, DR_flags_size));
2942         fprintf(out, " u %d,",
2943             toi(isodirrec + DR_file_unit_size_offset, DR_file_unit_size_size));
2944         fprintf(out, " ilv %d,",
2945             toi(isodirrec + DR_interleave_offset, DR_interleave_size));
2946         fprintf(out, " seq %d,",
2947             toi(isodirrec + DR_volume_sequence_number_offset, DR_volume_sequence_number_size));
2948         fprintf(out, " nl %d:",
2949             toi(isodirrec + DR_name_len_offset, DR_name_len_size));
2950         fprintf(out, " `%.*s'",
2951             toi(isodirrec + DR_name_len_offset, DR_name_len_size), isodirrec + DR_name_offset);
2952 }
2953 #endif