/src/libarchive/libarchive/archive_read_support_format_iso9660.c

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/*-
 * Copyright (c) 2003-2007 Tim Kientzle
 * Copyright (c) 2009 Andreas Henriksson <andreas@fatal.se>
 * Copyright (c) 2009-2012 Michihiro NAKAJIMA
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "archive_platform.h"
__FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_iso9660.c 201246 2009-12-30 05:30:35Z kientzle $");

#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
/* #include <stdint.h> */ /* See archive_platform.h */
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <time.h>
#ifdef HAVE_ZLIB_H
#include <zlib.h>
#endif

#include "archive.h"
#include "archive_endian.h"
#include "archive_entry.h"
#include "archive_entry_locale.h"
#include "archive_private.h"
#include "archive_read_private.h"
#include "archive_string.h"

/*
 * An overview of ISO 9660 format:
 *
 * Each disk is laid out as follows:
 *   * 32k reserved for private use
 *   * Volume descriptor table.  Each volume descriptor
 *     is 2k and specifies basic format information.
 *     The "Primary Volume Descriptor" (PVD) is defined by the
 *     standard and should always be present; other volume
 *     descriptors include various vendor-specific extensions.
 *   * Files and directories.  Each file/dir is specified by
 *     an "extent" (starting sector and length in bytes).
 *     Dirs are just files with directory records packed one
 *     after another.  The PVD contains a single dir entry
 *     specifying the location of the root directory.  Everything
 *     else follows from there.
 *
 * This module works by first reading the volume descriptors, then
 * building a list of directory entries, sorted by starting
 * sector.  At each step, I look for the earliest dir entry that
 * hasn't yet been read, seek forward to that location and read
 * that entry.  If it's a dir, I slurp in the new dir entries and
 * add them to the heap; if it's a regular file, I return the
 * corresponding archive_entry and wait for the client to request
 * the file body.  This strategy allows us to read most compliant
 * CDs with a single pass through the data, as required by libarchive.
 */
#define LOGICAL_BLOCK_SIZE  2048
#define SYSTEM_AREA_BLOCK 16

/* Structure of on-disk primary volume descriptor. */
#define PVD_type_offset 0
#define PVD_type_size 1
#define PVD_id_offset (PVD_type_offset + PVD_type_size)
#define PVD_id_size 5
#define PVD_version_offset (PVD_id_offset + PVD_id_size)
#define PVD_version_size 1
#define PVD_reserved1_offset (PVD_version_offset + PVD_version_size)
#define PVD_reserved1_size 1
#define PVD_system_id_offset (PVD_reserved1_offset + PVD_reserved1_size)
#define PVD_system_id_size 32
#define PVD_volume_id_offset (PVD_system_id_offset + PVD_system_id_size)
#define PVD_volume_id_size 32
#define PVD_reserved2_offset (PVD_volume_id_offset + PVD_volume_id_size)
#define PVD_reserved2_size 8
#define PVD_volume_space_size_offset (PVD_reserved2_offset + PVD_reserved2_size)
#define PVD_volume_space_size_size 8
#define PVD_reserved3_offset (PVD_volume_space_size_offset + PVD_volume_space_size_size)
#define PVD_reserved3_size 32
#define PVD_volume_set_size_offset (PVD_reserved3_offset + PVD_reserved3_size)
#define PVD_volume_set_size_size 4
#define PVD_volume_sequence_number_offset (PVD_volume_set_size_offset + PVD_volume_set_size_size)
#define PVD_volume_sequence_number_size 4
#define PVD_logical_block_size_offset (PVD_volume_sequence_number_offset + PVD_volume_sequence_number_size)
#define PVD_logical_block_size_size 4
#define PVD_path_table_size_offset (PVD_logical_block_size_offset + PVD_logical_block_size_size)
#define PVD_path_table_size_size 8
#define PVD_type_1_path_table_offset (PVD_path_table_size_offset + PVD_path_table_size_size)
#define PVD_type_1_path_table_size 4
#define PVD_opt_type_1_path_table_offset (PVD_type_1_path_table_offset + PVD_type_1_path_table_size)
#define PVD_opt_type_1_path_table_size 4
#define PVD_type_m_path_table_offset (PVD_opt_type_1_path_table_offset + PVD_opt_type_1_path_table_size)
#define PVD_type_m_path_table_size 4
#define PVD_opt_type_m_path_table_offset (PVD_type_m_path_table_offset + PVD_type_m_path_table_size)
#define PVD_opt_type_m_path_table_size 4
#define PVD_root_directory_record_offset (PVD_opt_type_m_path_table_offset + PVD_opt_type_m_path_table_size)
#define PVD_root_directory_record_size 34
#define PVD_volume_set_id_offset (PVD_root_directory_record_offset + PVD_root_directory_record_size)
#define PVD_volume_set_id_size 128
#define PVD_publisher_id_offset (PVD_volume_set_id_offset + PVD_volume_set_id_size)
#define PVD_publisher_id_size 128
#define PVD_preparer_id_offset (PVD_publisher_id_offset + PVD_publisher_id_size)
#define PVD_preparer_id_size 128
#define PVD_application_id_offset (PVD_preparer_id_offset + PVD_preparer_id_size)
#define PVD_application_id_size 128
#define PVD_copyright_file_id_offset (PVD_application_id_offset + PVD_application_id_size)
#define PVD_copyright_file_id_size 37
#define PVD_abstract_file_id_offset (PVD_copyright_file_id_offset + PVD_copyright_file_id_size)
#define PVD_abstract_file_id_size 37
#define PVD_bibliographic_file_id_offset (PVD_abstract_file_id_offset + PVD_abstract_file_id_size)
#define PVD_bibliographic_file_id_size 37
#define PVD_creation_date_offset (PVD_bibliographic_file_id_offset + PVD_bibliographic_file_id_size)
#define PVD_creation_date_size 17
#define PVD_modification_date_offset (PVD_creation_date_offset + PVD_creation_date_size)
#define PVD_modification_date_size 17
#define PVD_expiration_date_offset (PVD_modification_date_offset + PVD_modification_date_size)
#define PVD_expiration_date_size 17
#define PVD_effective_date_offset (PVD_expiration_date_offset + PVD_expiration_date_size)
#define PVD_effective_date_size 17
#define PVD_file_structure_version_offset (PVD_effective_date_offset + PVD_effective_date_size)
#define PVD_file_structure_version_size 1
#define PVD_reserved4_offset (PVD_file_structure_version_offset + PVD_file_structure_version_size)
#define PVD_reserved4_size 1
#define PVD_application_data_offset (PVD_reserved4_offset + PVD_reserved4_size)
#define PVD_application_data_size 512
#define PVD_reserved5_offset (PVD_application_data_offset + PVD_application_data_size)
#define PVD_reserved5_size (2048 - PVD_reserved5_offset)

/* TODO: It would make future maintenance easier to just hardcode the
 * above values.  In particular, ECMA119 states the offsets as part of
 * the standard.  That would eliminate the need for the following check.*/
#if PVD_reserved5_offset != 1395
#error PVD offset and size definitions are wrong.
#endif


/* Structure of optional on-disk supplementary volume descriptor. */
#define SVD_type_offset 0
#define SVD_type_size 1
#define SVD_id_offset (SVD_type_offset + SVD_type_size)
#define SVD_id_size 5
#define SVD_version_offset (SVD_id_offset + SVD_id_size)
#define SVD_version_size 1
/* ... */
#define SVD_reserved1_offset  72
#define SVD_reserved1_size  8
#define SVD_volume_space_size_offset 80
#define SVD_volume_space_size_size 8
#define SVD_escape_sequences_offset (SVD_volume_space_size_offset + SVD_volume_space_size_size)
#define SVD_escape_sequences_size 32
/* ... */
#define SVD_logical_block_size_offset 128
#define SVD_logical_block_size_size 4
#define SVD_type_L_path_table_offset 140
#define SVD_type_M_path_table_offset 148
/* ... */
#define SVD_root_directory_record_offset 156
#define SVD_root_directory_record_size 34
#define SVD_file_structure_version_offset 881
#define SVD_reserved2_offset  882
#define SVD_reserved2_size  1
#define SVD_reserved3_offset  1395
#define SVD_reserved3_size  653
/* ... */
/* FIXME: validate correctness of last SVD entry offset. */

/* Structure of an on-disk directory record. */
/* Note:  ISO9660 stores each multi-byte integer twice, once in
 * each byte order.  The sizes here are the size of just one
 * of the two integers.  (This is why the offset of a field isn't
 * the same as the offset+size of the previous field.) */
#define DR_length_offset 0
#define DR_length_size 1
#define DR_ext_attr_length_offset 1
#define DR_ext_attr_length_size 1
#define DR_extent_offset 2
#define DR_extent_size 4
#define DR_size_offset 10
#define DR_size_size 4
#define DR_date_offset 18
#define DR_date_size 7
#define DR_flags_offset 25
#define DR_flags_size 1
#define DR_file_unit_size_offset 26
#define DR_file_unit_size_size 1
#define DR_interleave_offset 27
#define DR_interleave_size 1
#define DR_volume_sequence_number_offset 28
#define DR_volume_sequence_number_size 2
#define DR_name_len_offset 32
#define DR_name_len_size 1
#define DR_name_offset 33

#ifdef HAVE_ZLIB_H
static const unsigned char zisofs_magic[8] = {
  0x37, 0xE4, 0x53, 0x96, 0xC9, 0xDB, 0xD6, 0x07
};

struct zisofs {
  /* Set 1 if this file compressed by paged zlib */
  int    pz;
  int    pz_log2_bs; /* Log2 of block size */
  uint64_t   pz_uncompressed_size;

  int    initialized;
  unsigned char *uncompressed_buffer;
  size_t     uncompressed_buffer_size;

  uint32_t   pz_offset;
  unsigned char  header[16];
  size_t     header_avail;
  int    header_passed;
  unsigned char *block_pointers;
  size_t     block_pointers_alloc;
  size_t     block_pointers_size;
  size_t     block_pointers_avail;
  size_t     block_off;
  uint32_t   block_avail;

  z_stream   stream;
  int    stream_valid;
};
#else
struct zisofs {
  /* Set 1 if this file compressed by paged zlib */
  int    pz;
};
#endif

struct content {
  uint64_t   offset;/* Offset on disk.    */
  uint64_t   size;  /* File size in bytes.    */
  struct content  *next;
};

/* In-memory storage for a directory record. */
struct file_info {
  struct file_info  *use_next;
  struct file_info  *parent;
  struct file_info  *next;
  struct file_info  *re_next;
  int    subdirs;
  uint64_t   key;   /* Heap Key.      */
  uint64_t   offset;  /* Offset on disk.    */
  uint64_t   size;    /* File size in bytes.    */
  uint32_t   ce_offset; /* Offset of CE.    */
  uint32_t   ce_size; /* Size of CE.      */
  char     rr_moved;  /* Flag to rr_moved.    */
  char     rr_moved_has_re_only;
  char     re;    /* Having RRIP "RE" extension.  */
  char     re_descendant;
  uint64_t   cl_offset; /* Having RRIP "CL" extension.  */
  int    birthtime_is_set;
  time_t     birthtime; /* File created time.   */
  time_t     mtime;   /* File last modified time. */
  time_t     atime;   /* File last accessed time. */
  time_t     ctime;   /* File attribute change time.  */
  uint64_t   rdev;    /* Device number.   */
  mode_t     mode;
  uid_t    uid;
  gid_t    gid;
  int64_t    number;
  int    nlinks;
  struct archive_string name; /* Pathname */
  unsigned char *utf16be_name;
  size_t     utf16be_bytes;
  char     name_continues; /* Non-zero if name continues */
  struct archive_string symlink;
  char     symlink_continues; /* Non-zero if link continues */
  /* Set 1 if this file compressed by paged zlib(zisofs) */
  int    pz;
  int    pz_log2_bs; /* Log2 of block size */
  uint64_t   pz_uncompressed_size;
  /* Set 1 if this file is multi extent. */
  int    multi_extent;
  struct {
    struct content  *first;
    struct content  **last;
  } contents;
  struct {
    struct file_info  *first;
    struct file_info  **last;
  } rede_files;
};

struct heap_queue {
  struct file_info **files;
  int    allocated;
  int    used;
};

struct iso9660 {
  int magic;
#define ISO9660_MAGIC   0x96609660

  int opt_support_joliet;
  int opt_support_rockridge;

  struct archive_string pathname;
  char  seenRockridge;  /* Set true if RR extensions are used. */
  char  seenSUSP; /* Set true if SUSP is being used. */
  char  seenJoliet;

  unsigned char suspOffset;
  struct file_info *rr_moved;
  struct read_ce_queue {
    struct read_ce_req {
      uint64_t   offset;/* Offset of CE on disk. */
      struct file_info *file;
    }   *reqs;
    int    cnt;
    int    allocated;
  } read_ce_req;

  int64_t   previous_number;
  struct archive_string previous_pathname;

  struct file_info    *use_files;
  struct heap_queue    pending_files;
  struct {
    struct file_info  *first;
    struct file_info  **last;
  } cache_files;
  struct {
    struct file_info  *first;
    struct file_info  **last;
  } re_files;

  uint64_t current_position;
  ssize_t logical_block_size;
  uint64_t volume_size; /* Total size of volume in bytes. */
  int32_t  volume_block;/* Total size of volume in logical blocks. */

  struct vd {
    int   location; /* Location of Extent.  */
    uint32_t  size;
  } primary, joliet;

  int64_t entry_sparse_offset;
  int64_t entry_bytes_remaining;
  size_t  entry_bytes_unconsumed;
  struct zisofs  entry_zisofs;
  struct content  *entry_content;
  struct archive_string_conv *sconv_utf16be;
  /*
   * Buffers for a full pathname in UTF-16BE in Joliet extensions.
   */
#define UTF16_NAME_MAX  1024
  unsigned char *utf16be_path;
  size_t     utf16be_path_len;
  unsigned char *utf16be_previous_path;
  size_t     utf16be_previous_path_len;
  /* Null buffer used in bidder to improve its performance. */
  unsigned char  null[2048];
};

static int  archive_read_format_iso9660_bid(struct archive_read *, int);
static int  archive_read_format_iso9660_options(struct archive_read *,
        const char *, const char *);
static int  archive_read_format_iso9660_cleanup(struct archive_read *);
static int  archive_read_format_iso9660_read_data(struct archive_read *,
        const void **, size_t *, int64_t *);
static int  archive_read_format_iso9660_read_data_skip(struct archive_read *);
static int  archive_read_format_iso9660_read_header(struct archive_read *,
        struct archive_entry *);
static const char *build_pathname(struct archive_string *, struct file_info *, int);
static int  build_pathname_utf16be(unsigned char *, size_t, size_t *,
        struct file_info *);
#if DEBUG
static void dump_isodirrec(FILE *, const unsigned char *isodirrec);
#endif
static time_t time_from_tm(struct tm *);
static time_t isodate17(const unsigned char *);
static time_t isodate7(const unsigned char *);
static int  isBootRecord(struct iso9660 *, const unsigned char *);
static int  isVolumePartition(struct iso9660 *, const unsigned char *);
static int  isVDSetTerminator(struct iso9660 *, const unsigned char *);
static int  isJolietSVD(struct iso9660 *, const unsigned char *);
static int  isSVD(struct iso9660 *, const unsigned char *);
static int  isEVD(struct iso9660 *, const unsigned char *);
static int  isPVD(struct iso9660 *, const unsigned char *);
static int  next_cache_entry(struct archive_read *, struct iso9660 *,
        struct file_info **);
static int  next_entry_seek(struct archive_read *, struct iso9660 *,
        struct file_info **);
static struct file_info *
    parse_file_info(struct archive_read *a,
        struct file_info *parent, const unsigned char *isodirrec,
        size_t reclen);
static int  parse_rockridge(struct archive_read *a,
        struct file_info *file, const unsigned char *start,
        const unsigned char *end);
static int  register_CE(struct archive_read *a, int32_t location,
        struct file_info *file);
static int  read_CE(struct archive_read *a, struct iso9660 *iso9660);
static void parse_rockridge_NM1(struct file_info *,
        const unsigned char *, int);
static void parse_rockridge_SL1(struct file_info *,
        const unsigned char *, int);
static void parse_rockridge_TF1(struct file_info *,
        const unsigned char *, int);
static void parse_rockridge_ZF1(struct file_info *,
        const unsigned char *, int);
static void register_file(struct iso9660 *, struct file_info *);
static void release_files(struct iso9660 *);
static unsigned toi(const void *p, int n);
static inline void re_add_entry(struct iso9660 *, struct file_info *);
static inline struct file_info * re_get_entry(struct iso9660 *);
static inline int rede_add_entry(struct file_info *);
static inline struct file_info * rede_get_entry(struct file_info *);
static inline void cache_add_entry(struct iso9660 *iso9660,
        struct file_info *file);
static inline struct file_info *cache_get_entry(struct iso9660 *iso9660);
static int  heap_add_entry(struct archive_read *a, struct heap_queue *heap,
        struct file_info *file, uint64_t key);
static struct file_info *heap_get_entry(struct heap_queue *heap);

#define add_entry(arch, iso9660, file)  \
  heap_add_entry(arch, &((iso9660)->pending_files), file, file->offset)
#define next_entry(iso9660)   \
  heap_get_entry(&((iso9660)->pending_files))

int
archive_read_support_format_iso9660(struct archive *_a)
{
  struct archive_read *a = (struct archive_read *)_a;
  struct iso9660 *iso9660;
  int r;

  archive_check_magic(_a, ARCHIVE_READ_MAGIC,
      ARCHIVE_STATE_NEW, "archive_read_support_format_iso9660");

  iso9660 = (struct iso9660 *)calloc(1, sizeof(*iso9660));
  if (iso9660 == NULL) {
    archive_set_error(&a->archive, ENOMEM,
        "Can't allocate iso9660 data");
    return (ARCHIVE_FATAL);
  }
  iso9660->magic = ISO9660_MAGIC;
  iso9660->cache_files.first = NULL;
  iso9660->cache_files.last = &(iso9660->cache_files.first);
  iso9660->re_files.first = NULL;
  iso9660->re_files.last = &(iso9660->re_files.first);
  /* Enable to support Joliet extensions by default.  */
  iso9660->opt_support_joliet = 1;
  /* Enable to support Rock Ridge extensions by default.  */
  iso9660->opt_support_rockridge = 1;

  r = __archive_read_register_format(a,
      iso9660,
      "iso9660",
      archive_read_format_iso9660_bid,
      archive_read_format_iso9660_options,
      archive_read_format_iso9660_read_header,
      archive_read_format_iso9660_read_data,
      archive_read_format_iso9660_read_data_skip,
      NULL,
      archive_read_format_iso9660_cleanup,
      NULL,
      NULL);

  if (r != ARCHIVE_OK) {
    free(iso9660);
    return (r);
  }
  return (ARCHIVE_OK);
}


static int
archive_read_format_iso9660_bid(struct archive_read *a, int best_bid)
{
  struct iso9660 *iso9660;
  ssize_t bytes_read;
  const unsigned char *p;
  int seenTerminator;

  /* If there's already a better bid than we can ever
     make, don't bother testing. */
  if (best_bid > 48)
    return (-1);

  iso9660 = (struct iso9660 *)(a->format->data);

  /*
   * Skip the first 32k (reserved area) and get the first
   * 8 sectors of the volume descriptor table.  Of course,
   * if the I/O layer gives us more, we'll take it.
   */
#define RESERVED_AREA (SYSTEM_AREA_BLOCK * LOGICAL_BLOCK_SIZE)
  p = __archive_read_ahead(a,
      RESERVED_AREA + 8 * LOGICAL_BLOCK_SIZE,
      &bytes_read);
  if (p == NULL)
      return (-1);

  /* Skip the reserved area. */
  bytes_read -= RESERVED_AREA;
  p += RESERVED_AREA;

  /* Check each volume descriptor. */
  seenTerminator = 0;
  for (; bytes_read > LOGICAL_BLOCK_SIZE;
      bytes_read -= LOGICAL_BLOCK_SIZE, p += LOGICAL_BLOCK_SIZE) {
    /* Do not handle undefined Volume Descriptor Type. */
    if (p[0] >= 4 && p[0] <= 254)
      return (0);
    /* Standard Identifier must be "CD001" */
    if (memcmp(p + 1, "CD001", 5) != 0)
      return (0);
    if (isPVD(iso9660, p))
      continue;
    if (!iso9660->joliet.location) {
      if (isJolietSVD(iso9660, p))
        continue;
    }
    if (isBootRecord(iso9660, p))
      continue;
    if (isEVD(iso9660, p))
      continue;
    if (isSVD(iso9660, p))
      continue;
    if (isVolumePartition(iso9660, p))
      continue;
    if (isVDSetTerminator(iso9660, p)) {
      seenTerminator = 1;
      break;
    }
    return (0);
  }
  /*
   * ISO 9660 format must have Primary Volume Descriptor and
   * Volume Descriptor Set Terminator.
   */
  if (seenTerminator && iso9660->primary.location > 16)
    return (48);

  /* We didn't find a valid PVD; return a bid of zero. */
  return (0);
}

static int
archive_read_format_iso9660_options(struct archive_read *a,
    const char *key, const char *val)
{
  struct iso9660 *iso9660;

  iso9660 = (struct iso9660 *)(a->format->data);

  if (strcmp(key, "joliet") == 0) {
    if (val == NULL || strcmp(val, "off") == 0 ||
        strcmp(val, "ignore") == 0 ||
        strcmp(val, "disable") == 0 ||
        strcmp(val, "0") == 0)
      iso9660->opt_support_joliet = 0;
    else
      iso9660->opt_support_joliet = 1;
    return (ARCHIVE_OK);
  }
  if (strcmp(key, "rockridge") == 0 ||
      strcmp(key, "Rockridge") == 0) {
    iso9660->opt_support_rockridge = val != NULL;
    return (ARCHIVE_OK);
  }

  /* Note: The "warn" return is just to inform the options
   * supervisor that we didn't handle it.  It will generate
   * a suitable error if no one used this option. */
  return (ARCHIVE_WARN);
}

static int
isNull(struct iso9660 *iso9660, const unsigned char *h, unsigned offset,
unsigned bytes)
{

  while (bytes >= sizeof(iso9660->null)) {
    if (!memcmp(iso9660->null, h + offset, sizeof(iso9660->null)))
      return (0);
    offset += sizeof(iso9660->null);
    bytes -= sizeof(iso9660->null);
  }
  if (bytes)
    return memcmp(iso9660->null, h + offset, bytes) == 0;
  else
    return (1);
}

static int
isBootRecord(struct iso9660 *iso9660, const unsigned char *h)
{
  (void)iso9660; /* UNUSED */

  /* Type of the Volume Descriptor Boot Record must be 0. */
  if (h[0] != 0)
    return (0);

  /* Volume Descriptor Version must be 1. */
  if (h[6] != 1)
    return (0);

  return (1);
}

static int
isVolumePartition(struct iso9660 *iso9660, const unsigned char *h)
{
  int32_t location;

  /* Type of the Volume Partition Descriptor must be 3. */
  if (h[0] != 3)
    return (0);

  /* Volume Descriptor Version must be 1. */
  if (h[6] != 1)
    return (0);
  /* Unused Field */
  if (h[7] != 0)
    return (0);

  location = archive_le32dec(h + 72);
  if (location <= SYSTEM_AREA_BLOCK ||
      location >= iso9660->volume_block)
    return (0);
  if ((uint32_t)location != archive_be32dec(h + 76))
    return (0);

  return (1);
}

static int
isVDSetTerminator(struct iso9660 *iso9660, const unsigned char *h)
{
  (void)iso9660; /* UNUSED */

  /* Type of the Volume Descriptor Set Terminator must be 255. */
  if (h[0] != 255)
    return (0);

  /* Volume Descriptor Version must be 1. */
  if (h[6] != 1)
    return (0);

  /* Reserved field must be 0. */
  if (!isNull(iso9660, h, 7, 2048-7))
    return (0);

  return (1);
}

static int
isJolietSVD(struct iso9660 *iso9660, const unsigned char *h)
{
  const unsigned char *p;
  ssize_t logical_block_size;
  int32_t volume_block;

  /* Check if current sector is a kind of Supplementary Volume
   * Descriptor. */
  if (!isSVD(iso9660, h))
    return (0);

  /* FIXME: do more validations according to joliet spec. */

  /* check if this SVD contains joliet extension! */
  p = h + SVD_escape_sequences_offset;
  /* N.B. Joliet spec says p[1] == '\\', but.... */
  if (p[0] == '%' && p[1] == '/') {
    int level = 0;

    if (p[2] == '@')
      level = 1;
    else if (p[2] == 'C')
      level = 2;
    else if (p[2] == 'E')
      level = 3;
    else /* not joliet */
      return (0);

    iso9660->seenJoliet = level;

  } else /* not joliet */
    return (0);

  logical_block_size =
      archive_le16dec(h + SVD_logical_block_size_offset);
  volume_block = archive_le32dec(h + SVD_volume_space_size_offset);

  iso9660->logical_block_size = logical_block_size;
  iso9660->volume_block = volume_block;
  iso9660->volume_size = logical_block_size * (uint64_t)volume_block;
  /* Read Root Directory Record in Volume Descriptor. */
  p = h + SVD_root_directory_record_offset;
  iso9660->joliet.location = archive_le32dec(p + DR_extent_offset);
  iso9660->joliet.size = archive_le32dec(p + DR_size_offset);

  return (48);
}

static int
isSVD(struct iso9660 *iso9660, const unsigned char *h)
{
  const unsigned char *p;
  ssize_t logical_block_size;
  int32_t volume_block;
  int32_t location;

  (void)iso9660; /* UNUSED */

  /* Type 2 means it's a SVD. */
  if (h[SVD_type_offset] != 2)
    return (0);

  /* Reserved field must be 0. */
  if (!isNull(iso9660, h, SVD_reserved1_offset, SVD_reserved1_size))
    return (0);
  if (!isNull(iso9660, h, SVD_reserved2_offset, SVD_reserved2_size))
    return (0);
  if (!isNull(iso9660, h, SVD_reserved3_offset, SVD_reserved3_size))
    return (0);

  /* File structure version must be 1 for ISO9660/ECMA119. */
  if (h[SVD_file_structure_version_offset] != 1)
    return (0);

  logical_block_size =
      archive_le16dec(h + SVD_logical_block_size_offset);
  if (logical_block_size <= 0)
    return (0);

  volume_block = archive_le32dec(h + SVD_volume_space_size_offset);
  if (volume_block <= SYSTEM_AREA_BLOCK+4)
    return (0);

  /* Location of Occurrence of Type L Path Table must be
   * available location,
   * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
  location = archive_le32dec(h+SVD_type_L_path_table_offset);
  if (location < SYSTEM_AREA_BLOCK+2 || location >= volume_block)
    return (0);

  /* The Type M Path Table must be at a valid location (WinISO
   * and probably other programs omit this, so we allow zero)
   *
   * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
  location = archive_be32dec(h+SVD_type_M_path_table_offset);
  if ((location > 0 && location < SYSTEM_AREA_BLOCK+2)
      || location >= volume_block)
    return (0);

  /* Read Root Directory Record in Volume Descriptor. */
  p = h + SVD_root_directory_record_offset;
  if (p[DR_length_offset] != 34)
    return (0);

  return (48);
}

static int
isEVD(struct iso9660 *iso9660, const unsigned char *h)
{
  const unsigned char *p;
  ssize_t logical_block_size;
  int32_t volume_block;
  int32_t location;

  (void)iso9660; /* UNUSED */

  /* Type of the Enhanced Volume Descriptor must be 2. */
  if (h[PVD_type_offset] != 2)
    return (0);

  /* EVD version must be 2. */
  if (h[PVD_version_offset] != 2)
    return (0);

  /* Reserved field must be 0. */
  if (h[PVD_reserved1_offset] != 0)
    return (0);

  /* Reserved field must be 0. */
  if (!isNull(iso9660, h, PVD_reserved2_offset, PVD_reserved2_size))
    return (0);

  /* Reserved field must be 0. */
  if (!isNull(iso9660, h, PVD_reserved3_offset, PVD_reserved3_size))
    return (0);

  /* Logical block size must be > 0. */
  /* I've looked at Ecma 119 and can't find any stronger
   * restriction on this field. */
  logical_block_size =
      archive_le16dec(h + PVD_logical_block_size_offset);
  if (logical_block_size <= 0)
    return (0);

  volume_block =
      archive_le32dec(h + PVD_volume_space_size_offset);
  if (volume_block <= SYSTEM_AREA_BLOCK+4)
    return (0);

  /* File structure version must be 2 for ISO9660:1999. */
  if (h[PVD_file_structure_version_offset] != 2)
    return (0);

  /* Location of Occurrence of Type L Path Table must be
   * available location,
   * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
  location = archive_le32dec(h+PVD_type_1_path_table_offset);
  if (location < SYSTEM_AREA_BLOCK+2 || location >= volume_block)
    return (0);

  /* Location of Occurrence of Type M Path Table must be
   * available location,
   * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
  location = archive_be32dec(h+PVD_type_m_path_table_offset);
  if ((location > 0 && location < SYSTEM_AREA_BLOCK+2)
      || location >= volume_block)
    return (0);

  /* Reserved field must be 0. */
  if (!isNull(iso9660, h, PVD_reserved4_offset, PVD_reserved4_size))
    return (0);

  /* Reserved field must be 0. */
  if (!isNull(iso9660, h, PVD_reserved5_offset, PVD_reserved5_size))
    return (0);

  /* Read Root Directory Record in Volume Descriptor. */
  p = h + PVD_root_directory_record_offset;
  if (p[DR_length_offset] != 34)
    return (0);

  return (48);
}

static int
isPVD(struct iso9660 *iso9660, const unsigned char *h)
{
  const unsigned char *p;
  ssize_t logical_block_size;
  int32_t volume_block;
  int32_t location;
  int i;

  /* Type of the Primary Volume Descriptor must be 1. */
  if (h[PVD_type_offset] != 1)
    return (0);

  /* PVD version must be 1. */
  if (h[PVD_version_offset] != 1)
    return (0);

  /* Reserved field must be 0. */
  if (h[PVD_reserved1_offset] != 0)
    return (0);

  /* Reserved field must be 0. */
  if (!isNull(iso9660, h, PVD_reserved2_offset, PVD_reserved2_size))
    return (0);

  /* Reserved field must be 0. */
  if (!isNull(iso9660, h, PVD_reserved3_offset, PVD_reserved3_size))
    return (0);

  /* Logical block size must be > 0. */
  /* I've looked at Ecma 119 and can't find any stronger
   * restriction on this field. */
  logical_block_size =
      archive_le16dec(h + PVD_logical_block_size_offset);
  if (logical_block_size <= 0)
    return (0);

  volume_block = archive_le32dec(h + PVD_volume_space_size_offset);
  if (volume_block <= SYSTEM_AREA_BLOCK+4)
    return (0);

  /* File structure version must be 1 for ISO9660/ECMA119. */
  if (h[PVD_file_structure_version_offset] != 1)
    return (0);

  /* Location of Occurrence of Type L Path Table must be
   * available location,
   * > SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
  location = archive_le32dec(h+PVD_type_1_path_table_offset);
  if (location < SYSTEM_AREA_BLOCK+2 || location >= volume_block)
    return (0);

  /* The Type M Path Table must also be at a valid location
   * (although ECMA 119 requires a Type M Path Table, WinISO and
   * probably other programs omit it, so we permit a zero here)
   *
   * >= SYSTEM_AREA_BLOCK(16) + 2 and < Volume Space Size. */
  location = archive_be32dec(h+PVD_type_m_path_table_offset);
  if ((location > 0 && location < SYSTEM_AREA_BLOCK+2)
      || location >= volume_block)
    return (0);

  /* Reserved field must be 0. */
  /* But accept NetBSD/FreeBSD "makefs" images with 0x20 here. */
  for (i = 0; i < PVD_reserved4_size; ++i)
    if (h[PVD_reserved4_offset + i] != 0
        && h[PVD_reserved4_offset + i] != 0x20)
      return (0);

  /* Reserved field must be 0. */
  if (!isNull(iso9660, h, PVD_reserved5_offset, PVD_reserved5_size))
    return (0);

  /* XXX TODO: Check other values for sanity; reject more
   * malformed PVDs. XXX */

  /* Read Root Directory Record in Volume Descriptor. */
  p = h + PVD_root_directory_record_offset;
  if (p[DR_length_offset] != 34)
    return (0);

  if (!iso9660->primary.location) {
    iso9660->logical_block_size = logical_block_size;
    iso9660->volume_block = volume_block;
    iso9660->volume_size =
        logical_block_size * (uint64_t)volume_block;
    iso9660->primary.location =
        archive_le32dec(p + DR_extent_offset);
    iso9660->primary.size = archive_le32dec(p + DR_size_offset);
  }

  return (48);
}

static int
read_children(struct archive_read *a, struct file_info *parent)
{
  struct iso9660 *iso9660;
  const unsigned char *b, *p;
  struct file_info *multi;
  size_t step, skip_size;

  iso9660 = (struct iso9660 *)(a->format->data);
  /* flush any remaining bytes from the last round to ensure
   * we're positioned */
  if (iso9660->entry_bytes_unconsumed) {
    __archive_read_consume(a, iso9660->entry_bytes_unconsumed);
    iso9660->entry_bytes_unconsumed = 0;
  }
  if (iso9660->current_position > parent->offset) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
        "Ignoring out-of-order directory (%s) %jd > %jd",
        parent->name.s,
        (intmax_t)iso9660->current_position,
        (intmax_t)parent->offset);
    return (ARCHIVE_WARN);
  }
  if (parent->offset + parent->size > iso9660->volume_size) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
        "Directory is beyond end-of-media: %s",
        parent->name.s);
    return (ARCHIVE_WARN);
  }
  if (iso9660->current_position < parent->offset) {
    int64_t skipsize;

    skipsize = parent->offset - iso9660->current_position;
    skipsize = __archive_read_consume(a, skipsize);
    if (skipsize < 0)
      return ((int)skipsize);
    iso9660->current_position = parent->offset;
  }

  step = (size_t)(((parent->size + iso9660->logical_block_size -1) /
      iso9660->logical_block_size) * iso9660->logical_block_size);
  b = __archive_read_ahead(a, step, NULL);
  if (b == NULL) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
        "Failed to read full block when scanning "
        "ISO9660 directory list");
    return (ARCHIVE_FATAL);
  }
  iso9660->current_position += step;
  multi = NULL;
  skip_size = step;
  while (step) {
    p = b;
    b += iso9660->logical_block_size;
    step -= iso9660->logical_block_size;
    for (; *p != 0 && p + DR_name_offset < b && p + *p <= b;
      p += *p) {
      struct file_info *child;

      /* N.B.: these special directory identifiers
       * are 8 bit "values" even on a
       * Joliet CD with UCS-2 (16bit) encoding.
       */

      /* Skip '.' entry. */
      if (*(p + DR_name_len_offset) == 1
          && *(p + DR_name_offset) == '\0')
        continue;
      /* Skip '..' entry. */
      if (*(p + DR_name_len_offset) == 1
          && *(p + DR_name_offset) == '\001')
        continue;
      child = parse_file_info(a, parent, p, b - p);
      if (child == NULL) {
        __archive_read_consume(a, skip_size);
        return (ARCHIVE_FATAL);
      }
      if (child->cl_offset == 0 &&
          (child->multi_extent || multi != NULL)) {
        struct content *con;

        if (multi == NULL) {
          multi = child;
          multi->contents.first = NULL;
          multi->contents.last =
              &(multi->contents.first);
        }
        con = malloc(sizeof(struct content));
        if (con == NULL) {
          archive_set_error(
              &a->archive, ENOMEM,
              "No memory for multi extent");
          __archive_read_consume(a, skip_size);
          return (ARCHIVE_FATAL);
        }
        con->offset = child->offset;
        con->size = child->size;
        con->next = NULL;
        *multi->contents.last = con;
        multi->contents.last = &(con->next);
        if (multi == child) {
          if (add_entry(a, iso9660, child)
              != ARCHIVE_OK)
            return (ARCHIVE_FATAL);
        } else {
          multi->size += child->size;
          if (!child->multi_extent)
            multi = NULL;
        }
      } else
        if (add_entry(a, iso9660, child) != ARCHIVE_OK)
          return (ARCHIVE_FATAL);
    }
  }

  __archive_read_consume(a, skip_size);

  /* Read data which recorded by RRIP "CE" extension. */
  if (read_CE(a, iso9660) != ARCHIVE_OK)
    return (ARCHIVE_FATAL);

  return (ARCHIVE_OK);
}

static int
choose_volume(struct archive_read *a, struct iso9660 *iso9660)
{
  struct file_info *file;
  int64_t skipsize;
  struct vd *vd;
  const void *block;
  char seenJoliet;

  vd = &(iso9660->primary);
  if (!iso9660->opt_support_joliet)
    iso9660->seenJoliet = 0;
  if (iso9660->seenJoliet &&
    vd->location > iso9660->joliet.location)
    /* This condition is unlikely; by way of caution. */
    vd = &(iso9660->joliet);

  skipsize = LOGICAL_BLOCK_SIZE * (int64_t)vd->location;
  skipsize = __archive_read_consume(a, skipsize);
  if (skipsize < 0)
    return ((int)skipsize);
  iso9660->current_position = skipsize;

  block = __archive_read_ahead(a, vd->size, NULL);
  if (block == NULL) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
        "Failed to read full block when scanning "
        "ISO9660 directory list");
    return (ARCHIVE_FATAL);
  }

  /*
   * While reading Root Directory, flag seenJoliet must be zero to
   * avoid converting special name 0x00(Current Directory) and
   * next byte to UCS2.
   */
  seenJoliet = iso9660->seenJoliet;/* Save flag. */
  iso9660->seenJoliet = 0;
  file = parse_file_info(a, NULL, block, vd->size);
  if (file == NULL)
    return (ARCHIVE_FATAL);
  iso9660->seenJoliet = seenJoliet;

  /*
   * If the iso image has both RockRidge and Joliet, we preferentially
   * use RockRidge Extensions rather than Joliet ones.
   */
  if (vd == &(iso9660->primary) && iso9660->seenRockridge
      && iso9660->seenJoliet)
    iso9660->seenJoliet = 0;

  if (vd == &(iso9660->primary) && !iso9660->seenRockridge
      && iso9660->seenJoliet) {
    /* Switch reading data from primary to joliet. */
    vd = &(iso9660->joliet);
    skipsize = LOGICAL_BLOCK_SIZE * (int64_t)vd->location;
    skipsize -= iso9660->current_position;
    skipsize = __archive_read_consume(a, skipsize);
    if (skipsize < 0)
      return ((int)skipsize);
    iso9660->current_position += skipsize;

    block = __archive_read_ahead(a, vd->size, NULL);
    if (block == NULL) {
      archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
          "Failed to read full block when scanning "
          "ISO9660 directory list");
      return (ARCHIVE_FATAL);
    }
    iso9660->seenJoliet = 0;
    file = parse_file_info(a, NULL, block, vd->size);
    if (file == NULL)
      return (ARCHIVE_FATAL);
    iso9660->seenJoliet = seenJoliet;
  }

  /* Store the root directory in the pending list. */
  if (add_entry(a, iso9660, file) != ARCHIVE_OK)
    return (ARCHIVE_FATAL);
  if (iso9660->seenRockridge) {
    a->archive.archive_format = ARCHIVE_FORMAT_ISO9660_ROCKRIDGE;
    a->archive.archive_format_name =
        "ISO9660 with Rockridge extensions";
  }

  return (ARCHIVE_OK);
}

static int
archive_read_format_iso9660_read_header(struct archive_read *a,
    struct archive_entry *entry)
{
  struct iso9660 *iso9660;
  struct file_info *file;
  int r, rd_r = ARCHIVE_OK;

  iso9660 = (struct iso9660 *)(a->format->data);

  if (!a->archive.archive_format) {
    a->archive.archive_format = ARCHIVE_FORMAT_ISO9660;
    a->archive.archive_format_name = "ISO9660";
  }

  if (iso9660->current_position == 0) {
    r = choose_volume(a, iso9660);
    if (r != ARCHIVE_OK)
      return (r);
  }

  file = NULL;/* Eliminate a warning. */
  /* Get the next entry that appears after the current offset. */
  r = next_entry_seek(a, iso9660, &file);
  if (r != ARCHIVE_OK)
    return (r);

  if (iso9660->seenJoliet) {
    /*
     * Convert UTF-16BE of a filename to local locale MBS
     * and store the result into a filename field.
     */
    if (iso9660->sconv_utf16be == NULL) {
      iso9660->sconv_utf16be =
          archive_string_conversion_from_charset(
        &(a->archive), "UTF-16BE", 1);
      if (iso9660->sconv_utf16be == NULL)
        /* Couldn't allocate memory */
        return (ARCHIVE_FATAL);
    }
    if (iso9660->utf16be_path == NULL) {
      iso9660->utf16be_path = malloc(UTF16_NAME_MAX);
      if (iso9660->utf16be_path == NULL) {
        archive_set_error(&a->archive, ENOMEM,
            "No memory");
        return (ARCHIVE_FATAL);
      }
    }
    if (iso9660->utf16be_previous_path == NULL) {
      iso9660->utf16be_previous_path = malloc(UTF16_NAME_MAX);
      if (iso9660->utf16be_previous_path == NULL) {
        archive_set_error(&a->archive, ENOMEM,
            "No memory");
        return (ARCHIVE_FATAL);
      }
    }

    iso9660->utf16be_path_len = 0;
    if (build_pathname_utf16be(iso9660->utf16be_path,
        UTF16_NAME_MAX, &(iso9660->utf16be_path_len), file) != 0) {
      archive_set_error(&a->archive,
          ARCHIVE_ERRNO_FILE_FORMAT,
          "Pathname is too long");
      return (ARCHIVE_FATAL);
    }

    r = archive_entry_copy_pathname_l(entry,
        (const char *)iso9660->utf16be_path,
        iso9660->utf16be_path_len,
        iso9660->sconv_utf16be);
    if (r != 0) {
      if (errno == ENOMEM) {
        archive_set_error(&a->archive, ENOMEM,
            "No memory for Pathname");
        return (ARCHIVE_FATAL);
      }
      archive_set_error(&a->archive,
          ARCHIVE_ERRNO_FILE_FORMAT,
          "Pathname cannot be converted "
          "from %s to current locale.",
          archive_string_conversion_charset_name(
            iso9660->sconv_utf16be));

      rd_r = ARCHIVE_WARN;
    }
  } else {
    const char *path = build_pathname(&iso9660->pathname, file, 0);
    if (path == NULL) {
      archive_set_error(&a->archive,
          ARCHIVE_ERRNO_FILE_FORMAT,
          "Pathname is too long");
      return (ARCHIVE_FATAL);
    } else {
      archive_string_empty(&iso9660->pathname);
      archive_entry_set_pathname(entry, path);
    }
  }

  iso9660->entry_bytes_remaining = file->size;
  /* Offset for sparse-file-aware clients. */
  iso9660->entry_sparse_offset = 0;

  if (file->offset + file->size > iso9660->volume_size) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
        "File is beyond end-of-media: %s",
        archive_entry_pathname(entry));
    iso9660->entry_bytes_remaining = 0;
    return (ARCHIVE_WARN);
  }

  /* Set up the entry structure with information about this entry. */
  archive_entry_set_mode(entry, file->mode);
  archive_entry_set_uid(entry, file->uid);
  archive_entry_set_gid(entry, file->gid);
  archive_entry_set_nlink(entry, file->nlinks);
  if (file->birthtime_is_set)
    archive_entry_set_birthtime(entry, file->birthtime, 0);
  else
    archive_entry_unset_birthtime(entry);
  archive_entry_set_mtime(entry, file->mtime, 0);
  archive_entry_set_ctime(entry, file->ctime, 0);
  archive_entry_set_atime(entry, file->atime, 0);
  /* N.B.: Rock Ridge supports 64-bit device numbers. */
  archive_entry_set_rdev(entry, (dev_t)file->rdev);
  archive_entry_set_size(entry, iso9660->entry_bytes_remaining);
  if (file->symlink.s != NULL)
    archive_entry_copy_symlink(entry, file->symlink.s);

  /* Note: If the input isn't seekable, we can't rewind to
   * return the same body again, so if the next entry refers to
   * the same data, we have to return it as a hardlink to the
   * original entry. */
  if (file->number != -1 &&
      file->number == iso9660->previous_number) {
    if (iso9660->seenJoliet) {
      r = archive_entry_copy_hardlink_l(entry,
          (const char *)iso9660->utf16be_previous_path,
          iso9660->utf16be_previous_path_len,
          iso9660->sconv_utf16be);
      if (r != 0) {
        if (errno == ENOMEM) {
          archive_set_error(&a->archive, ENOMEM,
              "No memory for Linkname");
          return (ARCHIVE_FATAL);
        }
        archive_set_error(&a->archive,
            ARCHIVE_ERRNO_FILE_FORMAT,
            "Linkname cannot be converted "
            "from %s to current locale.",
            archive_string_conversion_charset_name(
              iso9660->sconv_utf16be));
        rd_r = ARCHIVE_WARN;
      }
    } else
      archive_entry_set_hardlink(entry,
          iso9660->previous_pathname.s);
    archive_entry_unset_size(entry);
    iso9660->entry_bytes_remaining = 0;
    return (rd_r);
  }

  if ((file->mode & AE_IFMT) != AE_IFDIR &&
      file->offset < iso9660->current_position) {
    int64_t r64;

    r64 = __archive_read_seek(a, file->offset, SEEK_SET);
    if (r64 != (int64_t)file->offset) {
      /* We can't seek backwards to extract it, so issue
       * a warning.  Note that this can only happen if
       * this entry was added to the heap after we passed
       * this offset, that is, only if the directory
       * mentioning this entry is later than the body of
       * the entry. Such layouts are very unusual; most
       * ISO9660 writers lay out and record all directory
       * information first, then store all file bodies. */
      archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
          "Ignoring out-of-order file @%jx (%s) %jd < %jd",
          (intmax_t)file->number,
          iso9660->pathname.s,
          (intmax_t)file->offset,
          (intmax_t)iso9660->current_position);
      iso9660->entry_bytes_remaining = 0;
      return (ARCHIVE_WARN);
    }
    iso9660->current_position = (uint64_t)r64;
  }

  /* Initialize zisofs variables. */
  iso9660->entry_zisofs.pz = file->pz;
  if (file->pz) {
#ifdef HAVE_ZLIB_H
    struct zisofs  *zisofs;

    zisofs = &iso9660->entry_zisofs;
    zisofs->initialized = 0;
    zisofs->pz_log2_bs = file->pz_log2_bs;
    zisofs->pz_uncompressed_size = file->pz_uncompressed_size;
    zisofs->pz_offset = 0;
    zisofs->header_avail = 0;
    zisofs->header_passed = 0;
    zisofs->block_pointers_avail = 0;
#endif
    archive_entry_set_size(entry, file->pz_uncompressed_size);
  }

  iso9660->previous_number = file->number;
  if (iso9660->seenJoliet) {
    memcpy(iso9660->utf16be_previous_path, iso9660->utf16be_path,
        iso9660->utf16be_path_len);
    iso9660->utf16be_previous_path_len = iso9660->utf16be_path_len;
  } else
    archive_strcpy(
        &iso9660->previous_pathname, iso9660->pathname.s);

  /* Reset entry_bytes_remaining if the file is multi extent. */
  iso9660->entry_content = file->contents.first;
  if (iso9660->entry_content != NULL)
    iso9660->entry_bytes_remaining = iso9660->entry_content->size;

  if (archive_entry_filetype(entry) == AE_IFDIR) {
    /* Overwrite nlinks by proper link number which is
     * calculated from number of sub directories. */
    archive_entry_set_nlink(entry, 2 + file->subdirs);
    /* Directory data has been read completely. */
    iso9660->entry_bytes_remaining = 0;
  }

  if (rd_r != ARCHIVE_OK)
    return (rd_r);
  return (ARCHIVE_OK);
}

static int
archive_read_format_iso9660_read_data_skip(struct archive_read *a)
{
  /* Because read_next_header always does an explicit skip
   * to the next entry, we don't need to do anything here. */
  (void)a; /* UNUSED */
  return (ARCHIVE_OK);
}

#ifdef HAVE_ZLIB_H

static int
zisofs_read_data(struct archive_read *a,
    const void **buff, size_t *size, int64_t *offset)
{
  struct iso9660 *iso9660;
  struct zisofs  *zisofs;
  const unsigned char *p;
  size_t avail;
  ssize_t bytes_read;
  size_t uncompressed_size;
  int r;

  iso9660 = (struct iso9660 *)(a->format->data);
  zisofs = &iso9660->entry_zisofs;

  p = __archive_read_ahead(a, 1, &bytes_read);
  if (bytes_read <= 0) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
        "Truncated zisofs file body");
    return (ARCHIVE_FATAL);
  }
  if (bytes_read > iso9660->entry_bytes_remaining)
    bytes_read = (ssize_t)iso9660->entry_bytes_remaining;
  avail = bytes_read;
  uncompressed_size = 0;

  if (!zisofs->initialized) {
    size_t ceil, xsize;

    /* Allocate block pointers buffer. */
    ceil = (size_t)((zisofs->pz_uncompressed_size +
      (((int64_t)1) << zisofs->pz_log2_bs) - 1)
      >> zisofs->pz_log2_bs);
    xsize = (ceil + 1) * 4;
    if (zisofs->block_pointers_alloc < xsize) {
      size_t alloc;

      if (zisofs->block_pointers != NULL)
        free(zisofs->block_pointers);
      alloc = ((xsize >> 10) + 1) << 10;
      zisofs->block_pointers = malloc(alloc);
      if (zisofs->block_pointers == NULL) {
        archive_set_error(&a->archive, ENOMEM,
            "No memory for zisofs decompression");
        return (ARCHIVE_FATAL);
      }
      zisofs->block_pointers_alloc = alloc;
    }
    zisofs->block_pointers_size = xsize;

    /* Allocate uncompressed data buffer. */
    xsize = (size_t)1UL << zisofs->pz_log2_bs;
    if (zisofs->uncompressed_buffer_size < xsize) {
      if (zisofs->uncompressed_buffer != NULL)
        free(zisofs->uncompressed_buffer);
      zisofs->uncompressed_buffer = malloc(xsize);
      if (zisofs->uncompressed_buffer == NULL) {
        archive_set_error(&a->archive, ENOMEM,
            "No memory for zisofs decompression");
        return (ARCHIVE_FATAL);
      }
    }
    zisofs->uncompressed_buffer_size = xsize;

    /*
     * Read the file header, and check the magic code of zisofs.
     */
    if (zisofs->header_avail < sizeof(zisofs->header)) {
      xsize = sizeof(zisofs->header) - zisofs->header_avail;
      if (avail < xsize)
        xsize = avail;
      memcpy(zisofs->header + zisofs->header_avail, p, xsize);
      zisofs->header_avail += xsize;
      avail -= xsize;
      p += xsize;
    }
    if (!zisofs->header_passed &&
        zisofs->header_avail == sizeof(zisofs->header)) {
      int err = 0;

      if (memcmp(zisofs->header, zisofs_magic,
          sizeof(zisofs_magic)) != 0)
        err = 1;
      if (archive_le32dec(zisofs->header + 8)
          != zisofs->pz_uncompressed_size)
        err = 1;
      if (zisofs->header[12] != 4)
        err = 1;
      if (zisofs->header[13] != zisofs->pz_log2_bs)
        err = 1;
      if (err) {
        archive_set_error(&a->archive,
            ARCHIVE_ERRNO_FILE_FORMAT,
            "Illegal zisofs file body");
        return (ARCHIVE_FATAL);
      }
      zisofs->header_passed = 1;
    }
    /*
     * Read block pointers.
     */
    if (zisofs->header_passed &&
        zisofs->block_pointers_avail < zisofs->block_pointers_size) {
      xsize = zisofs->block_pointers_size
          - zisofs->block_pointers_avail;
      if (avail < xsize)
        xsize = avail;
      memcpy(zisofs->block_pointers
          + zisofs->block_pointers_avail, p, xsize);
      zisofs->block_pointers_avail += xsize;
      avail -= xsize;
      p += xsize;
          if (zisofs->block_pointers_avail
          == zisofs->block_pointers_size) {
        /* We've got all block pointers and initialize
         * related variables. */
        zisofs->block_off = 0;
        zisofs->block_avail = 0;
        /* Complete a initialization */
        zisofs->initialized = 1;
      }
    }

    if (!zisofs->initialized)
      goto next_data; /* We need more data. */
  }

  /*
   * Get block offsets from block pointers.
   */
  if (zisofs->block_avail == 0) {
    uint32_t bst, bed;

    if (zisofs->block_off + 4 >= zisofs->block_pointers_size) {
      /* There isn't a pair of offsets. */
      archive_set_error(&a->archive,
          ARCHIVE_ERRNO_FILE_FORMAT,
          "Illegal zisofs block pointers");
      return (ARCHIVE_FATAL);
    }
    bst = archive_le32dec(
        zisofs->block_pointers + zisofs->block_off);
    if (bst != zisofs->pz_offset + (bytes_read - avail)) {
      /* TODO: Should we seek offset of current file
       * by bst ? */
      archive_set_error(&a->archive,
          ARCHIVE_ERRNO_FILE_FORMAT,
          "Illegal zisofs block pointers(cannot seek)");
      return (ARCHIVE_FATAL);
    }
    bed = archive_le32dec(
        zisofs->block_pointers + zisofs->block_off + 4);
    if (bed < bst) {
      archive_set_error(&a->archive,
          ARCHIVE_ERRNO_FILE_FORMAT,
          "Illegal zisofs block pointers");
      return (ARCHIVE_FATAL);
    }
    zisofs->block_avail = bed - bst;
    zisofs->block_off += 4;

    /* Initialize compression library for new block. */
    if (zisofs->stream_valid)
      r = inflateReset(&zisofs->stream);
    else
      r = inflateInit(&zisofs->stream);
    if (r != Z_OK) {
      archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
          "Can't initialize zisofs decompression.");
      return (ARCHIVE_FATAL);
    }
    zisofs->stream_valid = 1;
    zisofs->stream.total_in = 0;
    zisofs->stream.total_out = 0;
  }

  /*
   * Make uncompressed data.
   */
  if (zisofs->block_avail == 0) {
    memset(zisofs->uncompressed_buffer, 0,
        zisofs->uncompressed_buffer_size);
    uncompressed_size = zisofs->uncompressed_buffer_size;
  } else {
    zisofs->stream.next_in = (Bytef *)(uintptr_t)(const void *)p;
    if (avail > zisofs->block_avail)
      zisofs->stream.avail_in = zisofs->block_avail;
    else
      zisofs->stream.avail_in = (uInt)avail;
    zisofs->stream.next_out = zisofs->uncompressed_buffer;
    zisofs->stream.avail_out =
        (uInt)zisofs->uncompressed_buffer_size;

    r = inflate(&zisofs->stream, 0);
    switch (r) {
    case Z_OK: /* Decompressor made some progress.*/
    case Z_STREAM_END: /* Found end of stream. */
      break;
    default:
      archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
          "zisofs decompression failed (%d)", r);
      return (ARCHIVE_FATAL);
    }
    uncompressed_size =
        zisofs->uncompressed_buffer_size - zisofs->stream.avail_out;
    avail -= zisofs->stream.next_in - p;
    zisofs->block_avail -= (uint32_t)(zisofs->stream.next_in - p);
  }
next_data:
  bytes_read -= avail;
  *buff = zisofs->uncompressed_buffer;
  *size = uncompressed_size;
  *offset = iso9660->entry_sparse_offset;
  iso9660->entry_sparse_offset += uncompressed_size;
  iso9660->entry_bytes_remaining -= bytes_read;
  iso9660->current_position += bytes_read;
  zisofs->pz_offset += (uint32_t)bytes_read;
  iso9660->entry_bytes_unconsumed += bytes_read;

  return (ARCHIVE_OK);
}

#else /* HAVE_ZLIB_H */

static int
zisofs_read_data(struct archive_read *a,
    const void **buff, size_t *size, int64_t *offset)
{

  (void)buff;/* UNUSED */
  (void)size;/* UNUSED */
  (void)offset;/* UNUSED */
  archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
      "zisofs is not supported on this platform.");
  return (ARCHIVE_FAILED);
}

#endif /* HAVE_ZLIB_H */

static int
archive_read_format_iso9660_read_data(struct archive_read *a,
    const void **buff, size_t *size, int64_t *offset)
{
  ssize_t bytes_read;
  struct iso9660 *iso9660;

  iso9660 = (struct iso9660 *)(a->format->data);

  if (iso9660->entry_bytes_unconsumed) {
    __archive_read_consume(a, iso9660->entry_bytes_unconsumed);
    iso9660->entry_bytes_unconsumed = 0;
  }

  if (iso9660->entry_bytes_remaining <= 0) {
    if (iso9660->entry_content != NULL)
      iso9660->entry_content = iso9660->entry_content->next;
    if (iso9660->entry_content == NULL) {
      *buff = NULL;
      *size = 0;
      *offset = iso9660->entry_sparse_offset;
      return (ARCHIVE_EOF);
    }
    /* Seek forward to the start of the entry. */
    if (iso9660->current_position < iso9660->entry_content->offset) {
      int64_t step;

      step = iso9660->entry_content->offset -
          iso9660->current_position;
      step = __archive_read_consume(a, step);
      if (step < 0)
        return ((int)step);
      iso9660->current_position =
          iso9660->entry_content->offset;
    }
    if (iso9660->entry_content->offset < iso9660->current_position) {
      archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
          "Ignoring out-of-order file (%s) %jd < %jd",
          iso9660->pathname.s,
          (intmax_t)iso9660->entry_content->offset,
          (intmax_t)iso9660->current_position);
      *buff = NULL;
      *size = 0;
      *offset = iso9660->entry_sparse_offset;
      return (ARCHIVE_WARN);
    }
    iso9660->entry_bytes_remaining = iso9660->entry_content->size;
  }
  if (iso9660->entry_zisofs.pz)
    return (zisofs_read_data(a, buff, size, offset));

  *buff = __archive_read_ahead(a, 1, &bytes_read);
  if (bytes_read == 0)
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
        "Truncated input file");
  if (*buff == NULL)
    return (ARCHIVE_FATAL);
  if (bytes_read > iso9660->entry_bytes_remaining)
    bytes_read = (ssize_t)iso9660->entry_bytes_remaining;
  *size = bytes_read;
  *offset = iso9660->entry_sparse_offset;
  iso9660->entry_sparse_offset += bytes_read;
  iso9660->entry_bytes_remaining -= bytes_read;
  iso9660->entry_bytes_unconsumed = bytes_read;
  iso9660->current_position += bytes_read;
  return (ARCHIVE_OK);
}

static int
archive_read_format_iso9660_cleanup(struct archive_read *a)
{
  struct iso9660 *iso9660;
  int r = ARCHIVE_OK;

  iso9660 = (struct iso9660 *)(a->format->data);
  release_files(iso9660);
  free(iso9660->read_ce_req.reqs);
  archive_string_free(&iso9660->pathname);
  archive_string_free(&iso9660->previous_pathname);
  free(iso9660->pending_files.files);
#ifdef HAVE_ZLIB_H
  free(iso9660->entry_zisofs.uncompressed_buffer);
  free(iso9660->entry_zisofs.block_pointers);
  if (iso9660->entry_zisofs.stream_valid) {
    if (inflateEnd(&iso9660->entry_zisofs.stream) != Z_OK) {
      archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
          "Failed to clean up zlib decompressor");
      r = ARCHIVE_FATAL;
    }
  }
#endif
  free(iso9660->utf16be_path);
  free(iso9660->utf16be_previous_path);
  free(iso9660);
  (a->format->data) = NULL;
  return (r);
}

/*
 * This routine parses a single ISO directory record, makes sense
 * of any extensions, and stores the result in memory.
 */
static struct file_info *
parse_file_info(struct archive_read *a, struct file_info *parent,
    const unsigned char *isodirrec, size_t reclen)
{
  struct iso9660 *iso9660;
  struct file_info *file, *filep;
  size_t name_len;
  const unsigned char *rr_start, *rr_end;
  const unsigned char *p;
  size_t dr_len = 0;
  uint64_t fsize, offset;
  int32_t location;
  int flags;

  iso9660 = (struct iso9660 *)(a->format->data);

  if (reclen != 0)
    dr_len = (size_t)isodirrec[DR_length_offset];
  /*
   * Sanity check that reclen is not zero and dr_len is greater than
   * reclen but at least 34
   */
  if (reclen == 0 || reclen < dr_len || dr_len < 34) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
      "Invalid length of directory record");
    return (NULL);
  }
  name_len = (size_t)isodirrec[DR_name_len_offset];
  location = archive_le32dec(isodirrec + DR_extent_offset);
  fsize = toi(isodirrec + DR_size_offset, DR_size_size);
  /* Sanity check that name_len doesn't exceed dr_len. */
  if (dr_len - 33 < name_len || name_len == 0) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
        "Invalid length of file identifier");
    return (NULL);
  }
  /* Sanity check that location doesn't exceed volume block.
   * Don't check lower limit of location; it's possibility
   * the location has negative value when file type is symbolic
   * link or file size is zero. As far as I know latest mkisofs
   * do that.
   */
  if (location > 0 &&
      (location + ((fsize + iso9660->logical_block_size -1)
         / iso9660->logical_block_size))
      > (uint32_t)iso9660->volume_block) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
        "Invalid location of extent of file");
    return (NULL);
  }
  /* Sanity check that location doesn't have a negative value
   * when the file is not empty. it's too large. */
  if (fsize != 0 && location < 0) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
        "Invalid location of extent of file");
    return (NULL);
  }

  /* Sanity check that this entry does not create a cycle. */
  offset = iso9660->logical_block_size * (uint64_t)location;
  for (filep = parent; filep != NULL; filep = filep->parent) {
    if (filep->offset == offset) {
      archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
          "Directory structure contains loop");
      return (NULL);
    }
  }

  /* Create a new file entry and copy data from the ISO dir record. */
  file = (struct file_info *)calloc(1, sizeof(*file));
  if (file == NULL) {
    archive_set_error(&a->archive, ENOMEM,
        "No memory for file entry");
    return (NULL);
  }
  file->parent = parent;
  file->offset = offset;
  file->size = fsize;
  file->mtime = isodate7(isodirrec + DR_date_offset);
  file->ctime = file->atime = file->mtime;
  file->rede_files.first = NULL;
  file->rede_files.last = &(file->rede_files.first);

  p = isodirrec + DR_name_offset;
  /* Rockridge extensions (if any) follow name.  Compute this
   * before fidgeting the name_len below. */
  rr_start = p + name_len + (name_len & 1 ? 0 : 1);
  rr_end = isodirrec + dr_len;

  if (iso9660->seenJoliet) {
    /* Joliet names are max 64 chars (128 bytes) according to spec,
     * but genisoimage/mkisofs allows recording longer Joliet
     * names which are 103 UCS2 characters(206 bytes) by their
     * option '-joliet-long'.
     */
    if (name_len > 206)
      name_len = 206;
    name_len &= ~1;

    /* trim trailing first version and dot from filename.
     *
     * Remember we were in UTF-16BE land!
     * SEPARATOR 1 (.) and SEPARATOR 2 (;) are both
     * 16 bits big endian characters on Joliet.
     *
     * TODO: sanitize filename?
     *       Joliet allows any UCS-2 char except:
     *       *, /, :, ;, ? and \.
     */
    /* Chop off trailing ';1' from files. */
    if (name_len > 4 && p[name_len-4] == 0 && p[name_len-3] == ';'
        && p[name_len-2] == 0 && p[name_len-1] == '1')
      name_len -= 4;
#if 0 /* XXX: this somehow manages to strip of single-character file extensions, like '.c'. */
    /* Chop off trailing '.' from filenames. */
    if (name_len > 2 && p[name_len-2] == 0 && p[name_len-1] == '.')
      name_len -= 2;
#endif
    if ((file->utf16be_name = malloc(name_len)) == NULL) {
      archive_set_error(&a->archive, ENOMEM,
          "No memory for file name");
      goto fail;
    }
    memcpy(file->utf16be_name, p, name_len);
    file->utf16be_bytes = name_len;
  } else {
    /* Chop off trailing ';1' from files. */
    if (name_len > 2 && p[name_len - 2] == ';' &&
        p[name_len - 1] == '1')
      name_len -= 2;
    /* Chop off trailing '.' from filenames. */
    if (name_len > 1 && p[name_len - 1] == '.')
      --name_len;

    archive_strncpy(&file->name, (const char *)p, name_len);
  }

  flags = isodirrec[DR_flags_offset];
  if (flags & 0x02)
    file->mode = AE_IFDIR | 0700;
  else
    file->mode = AE_IFREG | 0400;
  if (flags & 0x80)
    file->multi_extent = 1;
  else
    file->multi_extent = 0;
  /*
   * Use a location for the file number, which is treated as an inode
   * number to find out hardlink target. If Rockridge extensions is
   * being used, the file number will be overwritten by FILE SERIAL
   * NUMBER of RRIP "PX" extension.
   * Note: Old mkisofs did not record that FILE SERIAL NUMBER
   * in ISO images.
   * Note2: xorriso set 0 to the location of a symlink file.
   */
  if (file->size == 0 && location >= 0) {
    /* If file->size is zero, its location points wrong place,
     * and so we should not use it for the file number.
     * When the location has negative value, it can be used
     * for the file number.
     */
    file->number = -1;
    /* Do not appear before any directory entries. */
    file->offset = -1;
  } else
    file->number = (int64_t)(uint32_t)location;

  /* Rockridge extensions overwrite information from above. */
  if (iso9660->opt_support_rockridge) {
    if (parent == NULL && rr_end - rr_start >= 7) {
      p = rr_start;
      if (memcmp(p, "SP\x07\x01\xbe\xef", 6) == 0) {
        /*
         * SP extension stores the suspOffset
         * (Number of bytes to skip between
         * filename and SUSP records.)
         * It is mandatory by the SUSP standard
         * (IEEE 1281).
         *
         * It allows SUSP to coexist with
         * non-SUSP uses of the System
         * Use Area by placing non-SUSP data
         * before SUSP data.
         *
         * SP extension must be in the root
         * directory entry, disable all SUSP
         * processing if not found.
         */
        iso9660->suspOffset = p[6];
        iso9660->seenSUSP = 1;
        rr_start += 7;
      }
    }
    if (iso9660->seenSUSP) {
      int r;

      file->name_continues = 0;
      file->symlink_continues = 0;
      rr_start += iso9660->suspOffset;
      r = parse_rockridge(a, file, rr_start, rr_end);
      if (r != ARCHIVE_OK)
        goto fail;
      /*
       * A file size of symbolic link files in ISO images
       * made by makefs is not zero and its location is
       * the same as those of next regular file. That is
       * the same as hard like file and it causes unexpected
       * error.
       */
      if (file->size > 0 &&
          (file->mode & AE_IFMT) == AE_IFLNK) {
        file->size = 0;
        file->number = -1;
        file->offset = -1;
      }
    } else
      /* If there isn't SUSP, disable parsing
       * rock ridge extensions. */
      iso9660->opt_support_rockridge = 0;
  }

  file->nlinks = 1;/* Reset nlink. we'll calculate it later. */
  /* Tell file's parent how many children that parent has. */
  if (parent != NULL && (flags & 0x02))
    parent->subdirs++;

  if (iso9660->seenRockridge) {
    if (parent != NULL && parent->parent == NULL &&
        (flags & 0x02) && iso9660->rr_moved == NULL &&
        file->name.s &&
        (strcmp(file->name.s, "rr_moved") == 0 ||
         strcmp(file->name.s, ".rr_moved") == 0)) {
      iso9660->rr_moved = file;
      file->rr_moved = 1;
      file->rr_moved_has_re_only = 1;
      file->re = 0;
      parent->subdirs--;
    } else if (file->re) {
      /*
       * Sanity check: file's parent is rr_moved.
       */
      if (parent == NULL || parent->rr_moved == 0) {
        archive_set_error(&a->archive,
            ARCHIVE_ERRNO_MISC,
            "Invalid Rockridge RE");
        goto fail;
      }
      /*
       * Sanity check: file does not have "CL" extension.
       */
      if (file->cl_offset) {
        archive_set_error(&a->archive,
            ARCHIVE_ERRNO_MISC,
            "Invalid Rockridge RE and CL");
        goto fail;
      }
      /*
       * Sanity check: The file type must be a directory.
       */
      if ((flags & 0x02) == 0) {
        archive_set_error(&a->archive,
            ARCHIVE_ERRNO_MISC,
            "Invalid Rockridge RE");
        goto fail;
      }
    } else if (parent != NULL && parent->rr_moved)
      file->rr_moved_has_re_only = 0;
    else if (parent != NULL && (flags & 0x02) &&
        (parent->re || parent->re_descendant))
      file->re_descendant = 1;
    if (file->cl_offset) {
      struct file_info *r;

      if (parent == NULL || parent->parent == NULL) {
        archive_set_error(&a->archive,
            ARCHIVE_ERRNO_MISC,
            "Invalid Rockridge CL");
        goto fail;
      }
      /*
       * Sanity check: The file type must be a regular file.
       */
      if ((flags & 0x02) != 0) {
        archive_set_error(&a->archive,
            ARCHIVE_ERRNO_MISC,
            "Invalid Rockridge CL");
        goto fail;
      }
      parent->subdirs++;
      /* Overwrite an offset and a number of this "CL" entry
       * to appear before other dirs. "+1" to those is to
       * make sure to appear after "RE" entry which this
       * "CL" entry should be connected with. */
      file->offset = file->number = file->cl_offset + 1;

      /*
       * Sanity check: cl_offset does not point at its
       * the parents or itself.
       */
      for (r = parent; r; r = r->parent) {
        if (r->offset == file->cl_offset) {
          archive_set_error(&a->archive,
              ARCHIVE_ERRNO_MISC,
              "Invalid Rockridge CL");
          goto fail;
        }
      }
      if (file->cl_offset == file->offset ||
          parent->rr_moved) {
        archive_set_error(&a->archive,
            ARCHIVE_ERRNO_MISC,
            "Invalid Rockridge CL");
        goto fail;
      }
    }
  }

#if DEBUG
  /* DEBUGGING: Warn about attributes I don't yet fully support. */
  if ((flags & ~0x02) != 0) {
    fprintf(stderr, "\n ** Unrecognized flag: ");
    dump_isodirrec(stderr, isodirrec);
    fprintf(stderr, "\n");
  } else if (toi(isodirrec + DR_volume_sequence_number_offset, 2) != 1) {
    fprintf(stderr, "\n ** Unrecognized sequence number: ");
    dump_isodirrec(stderr, isodirrec);
    fprintf(stderr, "\n");
  } else if (*(isodirrec + DR_file_unit_size_offset) != 0) {
    fprintf(stderr, "\n ** Unexpected file unit size: ");
    dump_isodirrec(stderr, isodirrec);
    fprintf(stderr, "\n");
  } else if (*(isodirrec + DR_interleave_offset) != 0) {
    fprintf(stderr, "\n ** Unexpected interleave: ");
    dump_isodirrec(stderr, isodirrec);
    fprintf(stderr, "\n");
  } else if (*(isodirrec + DR_ext_attr_length_offset) != 0) {
    fprintf(stderr, "\n ** Unexpected extended attribute length: ");
    dump_isodirrec(stderr, isodirrec);
    fprintf(stderr, "\n");
  }
#endif
  register_file(iso9660, file);
  return (file);
fail:
  archive_string_free(&file->name);
  free(file);
  return (NULL);
}

static int
parse_rockridge(struct archive_read *a, struct file_info *file,
    const unsigned char *p, const unsigned char *end)
{
  struct iso9660 *iso9660;
  int entry_seen = 0;

  iso9660 = (struct iso9660 *)(a->format->data);

  while (p + 4 <= end  /* Enough space for another entry. */
      && p[0] >= 'A' && p[0] <= 'Z' /* Sanity-check 1st char of name. */
      && p[1] >= 'A' && p[1] <= 'Z' /* Sanity-check 2nd char of name. */
      && p[2] >= 4 /* Sanity-check length. */
      && p + p[2] <= end) { /* Sanity-check length. */
    const unsigned char *data = p + 4;
    int data_length = p[2] - 4;
    int version = p[3];

    switch(p[0]) {
    case 'C':
      if (p[1] == 'E') {
        if (version == 1 && data_length == 24) {
          /*
           * CE extension comprises:
           *   8 byte sector containing extension
           *   8 byte offset w/in above sector
           *   8 byte length of continuation
           */
          int32_t location =
              archive_le32dec(data);
          file->ce_offset =
              archive_le32dec(data+8);
          file->ce_size =
              archive_le32dec(data+16);
          if (register_CE(a, location, file)
              != ARCHIVE_OK)
            return (ARCHIVE_FATAL);
        }
      }
      else if (p[1] == 'L') {
        if (version == 1 && data_length == 8) {
          file->cl_offset = (uint64_t)
              iso9660->logical_block_size *
              (uint64_t)archive_le32dec(data);
          iso9660->seenRockridge = 1;
        }
      }
      break;
    case 'N':
      if (p[1] == 'M') {
        if (version == 1) {
          parse_rockridge_NM1(file,
              data, data_length);
          iso9660->seenRockridge = 1;
        }
      }
      break;
    case 'P':
      /*
       * PD extension is padding;
       * contents are always ignored.
       *
       * PL extension won't appear;
       * contents are always ignored.
       */
      if (p[1] == 'N') {
        if (version == 1 && data_length == 16) {
          file->rdev = toi(data,4);
          file->rdev <<= 32;
          file->rdev |= toi(data + 8, 4);
          iso9660->seenRockridge = 1;
        }
      }
      else if (p[1] == 'X') {
        /*
         * PX extension comprises:
         *   8 bytes for mode,
         *   8 bytes for nlinks,
         *   8 bytes for uid,
         *   8 bytes for gid,
         *   8 bytes for inode.
         */
        if (version == 1) {
          if (data_length >= 8)
            file->mode
                = toi(data, 4);
          if (data_length >= 16)
            file->nlinks
                = toi(data + 8, 4);
          if (data_length >= 24)
            file->uid
                = toi(data + 16, 4);
          if (data_length >= 32)
            file->gid
                = toi(data + 24, 4);
          if (data_length >= 40)
            file->number
                = toi(data + 32, 4);
          iso9660->seenRockridge = 1;
        }
      }
      break;
    case 'R':
      if (p[1] == 'E' && version == 1) {
        file->re = 1;
        iso9660->seenRockridge = 1;
      }
      else if (p[1] == 'R' && version == 1) {
        /*
         * RR extension comprises:
         *    one byte flag value
         * This extension is obsolete,
         * so contents are always ignored.
         */
      }
      break;
    case 'S':
      if (p[1] == 'L') {
        if (version == 1) {
          parse_rockridge_SL1(file,
              data, data_length);
          iso9660->seenRockridge = 1;
        }
      }
      else if (p[1] == 'T'
          && data_length == 0 && version == 1) {
        /*
         * ST extension marks end of this
         * block of SUSP entries.
         *
         * It allows SUSP to coexist with
         * non-SUSP uses of the System
         * Use Area by placing non-SUSP data
         * after SUSP data.
         */
        iso9660->seenSUSP = 0;
        iso9660->seenRockridge = 0;
        return (ARCHIVE_OK);
      }
      break;
    case 'T':
      if (p[1] == 'F') {
        if (version == 1) {
          parse_rockridge_TF1(file,
              data, data_length);
          iso9660->seenRockridge = 1;
        }
      }
      break;
    case 'Z':
      if (p[1] == 'F') {
        if (version == 1)
          parse_rockridge_ZF1(file,
              data, data_length);
      }
      break;
    default:
      break;
    }

    p += p[2];
    entry_seen = 1;
  }

  if (entry_seen)
    return (ARCHIVE_OK);
  else {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
          "Tried to parse Rockridge extensions, but none found");
    return (ARCHIVE_WARN);
  }
}

static int
register_CE(struct archive_read *a, int32_t location,
    struct file_info *file)
{
  struct iso9660 *iso9660;
  struct read_ce_queue *heap;
  struct read_ce_req *p;
  uint64_t offset, parent_offset;
  int hole, parent;

  iso9660 = (struct iso9660 *)(a->format->data);
  offset = ((uint64_t)location) * (uint64_t)iso9660->logical_block_size;
  if (((file->mode & AE_IFMT) == AE_IFREG &&
      offset >= file->offset) ||
      offset < iso9660->current_position ||
      (((uint64_t)file->ce_offset) + file->ce_size)
        > (uint64_t)iso9660->logical_block_size ||
      offset + file->ce_offset + file->ce_size
      > iso9660->volume_size) {
    archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
        "Invalid parameter in SUSP \"CE\" extension");
    return (ARCHIVE_FATAL);
  }

  /* Expand our CE list as necessary. */
  heap = &(iso9660->read_ce_req);
  if (heap->cnt >= heap->allocated) {
    int new_size;

    if (heap->allocated < 16)
      new_size = 16;
    else
      new_size = heap->allocated * 2;
    /* Overflow might keep us from growing the list. */
    if (new_size <= heap->allocated) {
      archive_set_error(&a->archive, ENOMEM, "Out of memory");
      return (ARCHIVE_FATAL);
    }
    p = calloc(new_size, sizeof(p[0]));
    if (p == NULL) {
      archive_set_error(&a->archive, ENOMEM, "Out of memory");
      return (ARCHIVE_FATAL);
    }
    if (heap->reqs != NULL) {
      memcpy(p, heap->reqs, heap->cnt * sizeof(*p));
      free(heap->reqs);
    }
    heap->reqs = p;
    heap->allocated = new_size;
  }

  /*
   * Start with hole at end, walk it up tree to find insertion point.
   */
  hole = heap->cnt++;
  while (hole > 0) {
    parent = (hole - 1)/2;
    parent_offset = heap->reqs[parent].offset;
    if (offset >= parent_offset) {
      heap->reqs[hole].offset = offset;
      heap->reqs[hole].file = file;
      return (ARCHIVE_OK);
    }
    /* Move parent into hole <==> move hole up tree. */
    heap->reqs[hole] = heap->reqs[parent];
    hole = parent;
  }
  heap->reqs[0].offset = offset;
  heap->reqs[0].file = file;
  return (ARCHIVE_OK);
}

static void
next_CE(struct read_ce_queue *heap)
{
  uint64_t a_offset, b_offset, c_offset;
  int a, b, c;
  struct read_ce_req tmp;

  if (heap->cnt < 1)
    return;

  /*
   * Move the last item in the heap to the root of the tree
   */
  heap->reqs[0] = heap->reqs[--(heap->cnt)];

  /*
   * Rebalance the heap.
   */
  a = 0; /* Starting element and its offset */
  a_offset = heap->reqs[a].offset;
  for (;;) {
    b = a + a + 1; /* First child */
    if (b >= heap->cnt)
      return;
    b_offset = heap->reqs[b].offset;
    c = b + 1; /* Use second child if it is smaller. */
    if (c < heap->cnt) {
      c_offset = heap->reqs[c].offset;
      if (c_offset < b_offset) {
        b = c;
        b_offset = c_offset;
      }
    }
    if (a_offset <= b_offset)
      return;
    tmp = heap->reqs[a];
    heap->reqs[a] = heap->reqs[b];
    heap->reqs[b] = tmp;
    a = b;
  }
}


static int
read_CE(struct archive_read *a, struct iso9660 *iso9660)
{
  struct read_ce_queue *heap;
  const unsigned char *b, *p, *end;
  struct file_info *file;
  size_t step;
  int r;

  /* Read data which RRIP "CE" extension points. */
  heap = &(iso9660->read_ce_req);
  step = iso9660->logical_block_size;
  while (heap->cnt &&
      heap->reqs[0].offset == iso9660->current_position) {
    b = __archive_read_ahead(a, step, NULL);
    if (b == NULL) {
      archive_set_error(&a->archive,
          ARCHIVE_ERRNO_MISC,
          "Failed to read full block when scanning "
          "ISO9660 directory list");
      return (ARCHIVE_FATAL);
    }
    do {
      file = heap->reqs[0].file;
      if (file->ce_offset + file->ce_size > step) {
        archive_set_error(&a->archive,
            ARCHIVE_ERRNO_FILE_FORMAT,
            "Malformed CE information");
        return (ARCHIVE_FATAL);
      }
      p = b + file->ce_offset;
      end = p + file->ce_size;
      next_CE(heap);
      r = parse_rockridge(a, file, p, end);
      if (r != ARCHIVE_OK)
        return (ARCHIVE_FATAL);
    } while (heap->cnt &&
        heap->reqs[0].offset == iso9660->current_position);
    /* NOTE: Do not move this consume's code to front of
     * do-while loop. Registration of nested CE extension
     * might cause error because of current position. */
    __archive_read_consume(a, step);
    iso9660->current_position += step;
  }
  return (ARCHIVE_OK);
}

static void
parse_rockridge_NM1(struct file_info *file,
        const unsigned char *data, int data_length)
{
  if (!file->name_continues)
    archive_string_empty(&file->name);
  file->name_continues = 0;
  if (data_length < 1)
    return;
  /*
   * NM version 1 extension comprises:
   *   1 byte flag, value is one of:
   *     = 0: remainder is name
   *     = 1: remainder is name, next NM entry continues name
   *     = 2: "."
   *     = 4: ".."
   *     = 32: Implementation specific
   *     All other values are reserved.
   */
  switch(data[0]) {
  case 0:
    if (data_length < 2)
      return;
    archive_strncat(&file->name,
        (const char *)data + 1, data_length - 1);
    break;
  case 1:
    if (data_length < 2)
      return;
    archive_strncat(&file->name,
        (const char *)data + 1, data_length - 1);
    file->name_continues = 1;
    break;
  case 2:
    archive_strcat(&file->name, ".");
    break;
  case 4:
    archive_strcat(&file->name, "..");
    break;
  default:
    return;
  }

}

static void
parse_rockridge_TF1(struct file_info *file, const unsigned char *data,
    int data_length)
{
  char flag;
  /*
   * TF extension comprises:
   *   one byte flag
   *   create time (optional)
   *   modify time (optional)
   *   access time (optional)
   *   attribute time (optional)
   *  Time format and presence of fields
   *  is controlled by flag bits.
   */
  if (data_length < 1)
    return;
  flag = data[0];
  ++data;
  --data_length;
  if (flag & 0x80) {
    /* Use 17-byte time format. */
    if ((flag & 1) && data_length >= 17) {
      /* Create time. */
      file->birthtime_is_set = 1;
      file->birthtime = isodate17(data);
      data += 17;
      data_length -= 17;
    }
    if ((flag & 2) && data_length >= 17) {
      /* Modify time. */
      file->mtime = isodate17(data);
      data += 17;
      data_length -= 17;
    }
    if ((flag & 4) && data_length >= 17) {
      /* Access time. */
      file->atime = isodate17(data);
      data += 17;
      data_length -= 17;
    }
    if ((flag & 8) && data_length >= 17) {
      /* Attribute change time. */
      file->ctime = isodate17(data);
    }
  } else {
    /* Use 7-byte time format. */
    if ((flag & 1) && data_length >= 7) {
      /* Create time. */
      file->birthtime_is_set = 1;
      file->birthtime = isodate7(data);
      data += 7;
      data_length -= 7;
    }
    if ((flag & 2) && data_length >= 7) {
      /* Modify time. */
      file->mtime = isodate7(data);
      data += 7;
      data_length -= 7;
    }
    if ((flag & 4) && data_length >= 7) {
      /* Access time. */
      file->atime = isodate7(data);
      data += 7;
      data_length -= 7;
    }
    if ((flag & 8) && data_length >= 7) {
      /* Attribute change time. */
      file->ctime = isodate7(data);
    }
  }
}

static void
parse_rockridge_SL1(struct file_info *file, const unsigned char *data,
    int data_length)
{
  const char *separator = "";

  if (!file->symlink_continues || file->symlink.length < 1)
    archive_string_empty(&file->symlink);
  file->symlink_continues = 0;

  /*
   * Defined flag values:
   *  0: This is the last SL record for this symbolic link
   *  1: this symbolic link field continues in next SL entry
   *  All other values are reserved.
   */
  if (data_length < 1)
    return;
  switch(*data) {
  case 0:
    break;
  case 1:
    file->symlink_continues = 1;
    break;
  default:
    return;
  }
  ++data;  /* Skip flag byte. */
  --data_length;

  /*
   * SL extension body stores "components".
   * Basically, this is a complicated way of storing
   * a POSIX path.  It also interferes with using
   * symlinks for storing non-path data. <sigh>
   *
   * Each component is 2 bytes (flag and length)
   * possibly followed by name data.
   */
  while (data_length >= 2) {
    unsigned char flag = *data++;
    unsigned char nlen = *data++;
    data_length -= 2;

    archive_strcat(&file->symlink, separator);
    separator = "/";

    switch(flag) {
    case 0: /* Usual case, this is text. */
      if (data_length < nlen)
        return;
      archive_strncat(&file->symlink,
          (const char *)data, nlen);
      break;
    case 0x01: /* Text continues in next component. */
      if (data_length < nlen)
        return;
      archive_strncat(&file->symlink,
          (const char *)data, nlen);
      separator = "";
      break;
    case 0x02: /* Current dir. */
      archive_strcat(&file->symlink, ".");
      break;
    case 0x04: /* Parent dir. */
      archive_strcat(&file->symlink, "..");
      break;
    case 0x08: /* Root of filesystem. */
      archive_strcat(&file->symlink, "/");
      separator = "";
      break;
    case 0x10: /* Undefined (historically "volume root" */
      archive_string_empty(&file->symlink);
      archive_strcat(&file->symlink, "ROOT");
      break;
    case 0x20: /* Undefined (historically "hostname") */
      archive_strcat(&file->symlink, "hostname");
      break;
    default:
      /* TODO: issue a warning ? */
      return;
    }
    data += nlen;
    data_length -= nlen;
  }
}

static void
parse_rockridge_ZF1(struct file_info *file, const unsigned char *data,
    int data_length)
{

  if (data[0] == 0x70 && data[1] == 0x7a && data_length == 12) {
    /* paged zlib */
    file->pz = 1;
    file->pz_log2_bs = data[3];
    file->pz_uncompressed_size = archive_le32dec(&data[4]);
  }
}

static void
register_file(struct iso9660 *iso9660, struct file_info *file)
{

  file->use_next = iso9660->use_files;
  iso9660->use_files = file;
}

static void
release_files(struct iso9660 *iso9660)
{
  struct content *con, *connext;
  struct file_info *file;

  file = iso9660->use_files;
  while (file != NULL) {
    struct file_info *next = file->use_next;

    archive_string_free(&file->name);
    archive_string_free(&file->symlink);
    free(file->utf16be_name);
    con = file->contents.first;
    while (con != NULL) {
      connext = con->next;
      free(con);
      con = connext;
    }
    free(file);
    file = next;
  }
}

static int
next_entry_seek(struct archive_read *a, struct iso9660 *iso9660,
    struct file_info **pfile)
{
  struct file_info *file;
  int r;

  r = next_cache_entry(a, iso9660, pfile);
  if (r != ARCHIVE_OK)
    return (r);
  file = *pfile;

  /* Don't waste time seeking for zero-length bodies. */
  if (file->size == 0)
    file->offset = iso9660->current_position;

  /* flush any remaining bytes from the last round to ensure
   * we're positioned */
  if (iso9660->entry_bytes_unconsumed) {
    __archive_read_consume(a, iso9660->entry_bytes_unconsumed);
    iso9660->entry_bytes_unconsumed = 0;
  }

  /* Seek forward to the start of the entry. */
  if (iso9660->current_position < file->offset) {
    int64_t step;

    step = file->offset - iso9660->current_position;
    step = __archive_read_consume(a, step);
    if (step < 0)
      return ((int)step);
    iso9660->current_position = file->offset;
  }

  /* We found body of file; handle it now. */
  return (ARCHIVE_OK);
}

static int
next_cache_entry(struct archive_read *a, struct iso9660 *iso9660,
    struct file_info **pfile)
{
  struct file_info *file;
  struct {
    struct file_info  *first;
    struct file_info  **last;
  } empty_files;
  int64_t number;
  int count;

  file = cache_get_entry(iso9660);
  if (file != NULL) {
    *pfile = file;
    return (ARCHIVE_OK);
  }

  for (;;) {
    struct file_info *re, *d;

    *pfile = file = next_entry(iso9660);
    if (file == NULL) {
      /*
       * If directory entries all which are descendant of
       * rr_moved are still remaining, expose their.
       */
      if (iso9660->re_files.first != NULL &&
          iso9660->rr_moved != NULL &&
          iso9660->rr_moved->rr_moved_has_re_only)
        /* Expose "rr_moved" entry. */
        cache_add_entry(iso9660, iso9660->rr_moved);
      while ((re = re_get_entry(iso9660)) != NULL) {
        /* Expose its descendant dirs. */
        while ((d = rede_get_entry(re)) != NULL)
          cache_add_entry(iso9660, d);
      }
      if (iso9660->cache_files.first != NULL)
        return (next_cache_entry(a, iso9660, pfile));
      return (ARCHIVE_EOF);
    }

    if (file->cl_offset) {
      struct file_info *first_re = NULL;
      int nexted_re = 0;

      /*
       * Find "RE" dir for the current file, which
       * has "CL" flag.
       */
      while ((re = re_get_entry(iso9660))
          != first_re) {
        if (first_re == NULL)
          first_re = re;
        if (re->offset == file->cl_offset) {
          re->parent->subdirs--;
          re->parent = file->parent;
          re->re = 0;
          if (re->parent->re_descendant) {
            nexted_re = 1;
            re->re_descendant = 1;
            if (rede_add_entry(re) < 0)
              goto fatal_rr;
            /* Move a list of descendants
             * to a new ancestor. */
            while ((d = rede_get_entry(
                re)) != NULL)
              if (rede_add_entry(d)
                  < 0)
                goto fatal_rr;
            break;
          }
          /* Replace the current file
           * with "RE" dir */
          *pfile = file = re;
          /* Expose its descendant */
          while ((d = rede_get_entry(
              file)) != NULL)
            cache_add_entry(
                iso9660, d);
          break;
        } else
          re_add_entry(iso9660, re);
      }
      if (nexted_re) {
        /*
         * Do not expose this at this time
         * because we have not gotten its full-path
         * name yet.
         */
        continue;
      }
    } else if ((file->mode & AE_IFMT) == AE_IFDIR) {
      int r;

      /* Read file entries in this dir. */
      r = read_children(a, file);
      if (r != ARCHIVE_OK)
        return (r);

      /*
       * Handle a special dir of Rockridge extensions,
       * "rr_moved".
       */
      if (file->rr_moved) {
        /*
         * If this has only the subdirectories which
         * have "RE" flags, do not expose at this time.
         */
        if (file->rr_moved_has_re_only)
          continue;
        /* Otherwise expose "rr_moved" entry. */
      } else if (file->re) {
        /*
         * Do not expose this at this time
         * because we have not gotten its full-path
         * name yet.
         */
        re_add_entry(iso9660, file);
        continue;
      } else if (file->re_descendant) {
        /*
         * If the top level "RE" entry of this entry
         * is not exposed, we, accordingly, should not
         * expose this entry at this time because
         * we cannot make its proper full-path name.
         */
        if (rede_add_entry(file) == 0)
          continue;
        /* Otherwise we can expose this entry because
         * it seems its top level "RE" has already been
         * exposed. */
      }
    }
    break;
  }

  if ((file->mode & AE_IFMT) != AE_IFREG || file->number == -1)
    return (ARCHIVE_OK);

  count = 0;
  number = file->number;
  iso9660->cache_files.first = NULL;
  iso9660->cache_files.last = &(iso9660->cache_files.first);
  empty_files.first = NULL;
  empty_files.last = &empty_files.first;
  /* Collect files which has the same file serial number.
   * Peek pending_files so that file which number is different
   * is not put back. */
  while (iso9660->pending_files.used > 0 &&
      (iso9660->pending_files.files[0]->number == -1 ||
       iso9660->pending_files.files[0]->number == number)) {
    if (file->number == -1) {
      /* This file has the same offset
       * but it's wrong offset which empty files
       * and symlink files have.
       * NOTE: This wrong offset was recorded by
       * old mkisofs utility. If ISO images is
       * created by latest mkisofs, this does not
       * happen.
       */
      file->next = NULL;
      *empty_files.last = file;
      empty_files.last = &(file->next);
    } else {
      count++;
      cache_add_entry(iso9660, file);
    }
    file = next_entry(iso9660);
  }

  if (count == 0) {
    *pfile = file;
    return ((file == NULL)?ARCHIVE_EOF:ARCHIVE_OK);
  }
  if (file->number == -1) {
    file->next = NULL;
    *empty_files.last = file;
    empty_files.last = &(file->next);
  } else {
    count++;
    cache_add_entry(iso9660, file);
  }

  if (count > 1) {
    /* The count is the same as number of hardlink,
     * so much so that each nlinks of files in cache_file
     * is overwritten by value of the count.
     */
    for (file = iso9660->cache_files.first;
        file != NULL; file = file->next)
      file->nlinks = count;
  }
  /* If there are empty files, that files are added
   * to the tail of the cache_files. */
  if (empty_files.first != NULL) {
    *iso9660->cache_files.last = empty_files.first;
    iso9660->cache_files.last = empty_files.last;
  }
  *pfile = cache_get_entry(iso9660);
  return ((*pfile == NULL)?ARCHIVE_EOF:ARCHIVE_OK);

fatal_rr:
  archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
      "Failed to connect 'CL' pointer to 'RE' rr_moved pointer of "
      "Rockridge extensions: current position = %jd, CL offset = %jd",
      (intmax_t)iso9660->current_position, (intmax_t)file->cl_offset);
  return (ARCHIVE_FATAL);
}

static inline void
re_add_entry(struct iso9660 *iso9660, struct file_info *file)
{
  file->re_next = NULL;
  *iso9660->re_files.last = file;
  iso9660->re_files.last = &(file->re_next);
}

static inline struct file_info *
re_get_entry(struct iso9660 *iso9660)
{
  struct file_info *file;

  if ((file = iso9660->re_files.first) != NULL) {
    iso9660->re_files.first = file->re_next;
    if (iso9660->re_files.first == NULL)
      iso9660->re_files.last =
          &(iso9660->re_files.first);
  }
  return (file);
}

static inline int
rede_add_entry(struct file_info *file)
{
  struct file_info *re;

  /*
   * Find "RE" entry.
   */
  re = file->parent;
  while (re != NULL && !re->re)
    re = re->parent;
  if (re == NULL)
    return (-1);

  file->re_next = NULL;
  *re->rede_files.last = file;
  re->rede_files.last = &(file->re_next);
  return (0);
}

static inline struct file_info *
rede_get_entry(struct file_info *re)
{
  struct file_info *file;

  if ((file = re->rede_files.first) != NULL) {
    re->rede_files.first = file->re_next;
    if (re->rede_files.first == NULL)
      re->rede_files.last =
          &(re->rede_files.first);
  }
  return (file);
}

static inline void
cache_add_entry(struct iso9660 *iso9660, struct file_info *file)
{
  file->next = NULL;
  *iso9660->cache_files.last = file;
  iso9660->cache_files.last = &(file->next);
}

static inline struct file_info *
cache_get_entry(struct iso9660 *iso9660)
{
  struct file_info *file;

  if ((file = iso9660->cache_files.first) != NULL) {
    iso9660->cache_files.first = file->next;
    if (iso9660->cache_files.first == NULL)
      iso9660->cache_files.last =
          &(iso9660->cache_files.first);
  }
  return (file);
}

static int
heap_add_entry(struct archive_read *a, struct heap_queue *heap,
    struct file_info *file, uint64_t key)
{
  uint64_t file_key, parent_key;
  int hole, parent;

  /* Reserve 16 bits for possible key collisions (needed for linked items) */
  /* For ISO files with more than 65535 entries, reordering will still occur */
  key <<= 16;
  key += heap->used & 0xFFFF;

  /* Expand our pending files list as necessary. */
  if (heap->used >= heap->allocated) {
    struct file_info **new_pending_files;
    int new_size = heap->allocated * 2;

    if (heap->allocated < 1024)
      new_size = 1024;
    /* Overflow might keep us from growing the list. */
    if (new_size <= heap->allocated) {
      archive_set_error(&a->archive,
          ENOMEM, "Out of memory");
      return (ARCHIVE_FATAL);
    }
    new_pending_files = (struct file_info **)
        malloc(new_size * sizeof(new_pending_files[0]));
    if (new_pending_files == NULL) {
      archive_set_error(&a->archive,
          ENOMEM, "Out of memory");
      return (ARCHIVE_FATAL);
    }
    if (heap->allocated)
      memcpy(new_pending_files, heap->files,
          heap->allocated * sizeof(new_pending_files[0]));
    free(heap->files);
    heap->files = new_pending_files;
    heap->allocated = new_size;
  }

  file_key = file->key = key;

  /*
   * Start with hole at end, walk it up tree to find insertion point.
   */
  hole = heap->used++;
  while (hole > 0) {
    parent = (hole - 1)/2;
    parent_key = heap->files[parent]->key;
    if (file_key >= parent_key) {
      heap->files[hole] = file;
      return (ARCHIVE_OK);
    }
    /* Move parent into hole <==> move hole up tree. */
    heap->files[hole] = heap->files[parent];
    hole = parent;
  }
  heap->files[0] = file;

  return (ARCHIVE_OK);
}

static struct file_info *
heap_get_entry(struct heap_queue *heap)
{
  uint64_t a_key, b_key, c_key;
  int a, b, c;
  struct file_info *r, *tmp;

  if (heap->used < 1)
    return (NULL);

  /*
   * The first file in the list is the earliest; we'll return this.
   */
  r = heap->files[0];

  /*
   * Move the last item in the heap to the root of the tree
   */
  heap->files[0] = heap->files[--(heap->used)];

  /*
   * Rebalance the heap.
   */
  a = 0; /* Starting element and its heap key */
  a_key = heap->files[a]->key;
  for (;;) {
    b = a + a + 1; /* First child */
    if (b >= heap->used)
      return (r);
    b_key = heap->files[b]->key;
    c = b + 1; /* Use second child if it is smaller. */
    if (c < heap->used) {
      c_key = heap->files[c]->key;
      if (c_key < b_key) {
        b = c;
        b_key = c_key;
      }
    }
    if (a_key <= b_key)
      return (r);
    tmp = heap->files[a];
    heap->files[a] = heap->files[b];
    heap->files[b] = tmp;
    a = b;
  }
}

static unsigned int
toi(const void *p, int n)
{
  const unsigned char *v = (const unsigned char *)p;
  if (n > 1)
    return v[0] + 256 * toi(v + 1, n - 1);
  if (n == 1)
    return v[0];
  return (0);
}

static time_t
isodate7(const unsigned char *v)
{
  struct tm tm;
  int offset;
  time_t t;

  memset(&tm, 0, sizeof(tm));
  tm.tm_year = v[0];
  tm.tm_mon = v[1] - 1;
  tm.tm_mday = v[2];
  tm.tm_hour = v[3];
  tm.tm_min = v[4];
  tm.tm_sec = v[5];
  /* v[6] is the signed timezone offset, in 1/4-hour increments. */
  offset = ((const signed char *)v)[6];
  if (offset > -48 && offset < 52) {
    tm.tm_hour -= offset / 4;
    tm.tm_min -= (offset % 4) * 15;
  }
  t = time_from_tm(&tm);
  if (t == (time_t)-1)
    return ((time_t)0);
  return (t);
}

static time_t
isodate17(const unsigned char *v)
{
  struct tm tm;
  int offset;
  time_t t;

  memset(&tm, 0, sizeof(tm));
  tm.tm_year = (v[0] - '0') * 1000 + (v[1] - '0') * 100
      + (v[2] - '0') * 10 + (v[3] - '0')
      - 1900;
  tm.tm_mon = (v[4] - '0') * 10 + (v[5] - '0');
  tm.tm_mday = (v[6] - '0') * 10 + (v[7] - '0');
  tm.tm_hour = (v[8] - '0') * 10 + (v[9] - '0');
  tm.tm_min = (v[10] - '0') * 10 + (v[11] - '0');
  tm.tm_sec = (v[12] - '0') * 10 + (v[13] - '0');
  /* v[16] is the signed timezone offset, in 1/4-hour increments. */
  offset = ((const signed char *)v)[16];
  if (offset > -48 && offset < 52) {
    tm.tm_hour -= offset / 4;
    tm.tm_min -= (offset % 4) * 15;
  }
  t = time_from_tm(&tm);
  if (t == (time_t)-1)
    return ((time_t)0);
  return (t);
}

static time_t
time_from_tm(struct tm *t)
{
#if HAVE__MKGMTIME
        return _mkgmtime(t);
#elif HAVE_TIMEGM
        /* Use platform timegm() if available. */
        return (timegm(t));
#else
        /* Else use direct calculation using POSIX assumptions. */
        /* First, fix up tm_yday based on the year/month/day. */
        if (mktime(t) == (time_t)-1)
                return ((time_t)-1);
        /* Then we can compute timegm() from first principles. */
        return (t->tm_sec
            + t->tm_min * 60
            + t->tm_hour * 3600
            + t->tm_yday * 86400
            + (t->tm_year - 70) * 31536000
            + ((t->tm_year - 69) / 4) * 86400
            - ((t->tm_year - 1) / 100) * 86400
            + ((t->tm_year + 299) / 400) * 86400);
#endif
}

static const char *
build_pathname(struct archive_string *as, struct file_info *file, int depth)
{
  // Plain ISO9660 only allows 8 dir levels; if we get
  // to 1000, then something is very, very wrong.
  if (depth > 1000) {
    return NULL;
  }
  if (file->parent != NULL && archive_strlen(&file->parent->name) > 0) {
    if (build_pathname(as, file->parent, depth + 1) == NULL) {
      return NULL;
    }
    archive_strcat(as, "/");
  }
  if (archive_strlen(&file->name) == 0)
    archive_strcat(as, ".");
  else
    archive_string_concat(as, &file->name);
  return (as->s);
}

static int
build_pathname_utf16be(unsigned char *p, size_t max, size_t *len,
    struct file_info *file)
{
  if (file->parent != NULL && file->parent->utf16be_bytes > 0) {
    if (build_pathname_utf16be(p, max, len, file->parent) != 0)
      return (-1);
    p[*len] = 0;
    p[*len + 1] = '/';
    *len += 2;
  }
  if (file->utf16be_bytes == 0) {
    if (*len + 2 > max)
      return (-1);/* Path is too long! */
    p[*len] = 0;
    p[*len + 1] = '.';
    *len += 2;
  } else {
    if (*len + file->utf16be_bytes > max)
      return (-1);/* Path is too long! */
    memcpy(p + *len, file->utf16be_name, file->utf16be_bytes);
    *len += file->utf16be_bytes;
  }
  return (0);
}

#if DEBUG
static void
dump_isodirrec(FILE *out, const unsigned char *isodirrec)
{
  fprintf(out, " l %d,",
      toi(isodirrec + DR_length_offset, DR_length_size));
  fprintf(out, " a %d,",
      toi(isodirrec + DR_ext_attr_length_offset, DR_ext_attr_length_size));
  fprintf(out, " ext 0x%x,",
      toi(isodirrec + DR_extent_offset, DR_extent_size));
  fprintf(out, " s %d,",
      toi(isodirrec + DR_size_offset, DR_extent_size));
  fprintf(out, " f 0x%x,",
      toi(isodirrec + DR_flags_offset, DR_flags_size));
  fprintf(out, " u %d,",
      toi(isodirrec + DR_file_unit_size_offset, DR_file_unit_size_size));
  fprintf(out, " ilv %d,",
      toi(isodirrec + DR_interleave_offset, DR_interleave_size));
  fprintf(out, " seq %d,",
      toi(isodirrec + DR_volume_sequence_number_offset,
    DR_volume_sequence_number_size));
  fprintf(out, " nl %d:",
      toi(isodirrec + DR_name_len_offset, DR_name_len_size));
  fprintf(out, " `%.*s'",
      toi(isodirrec + DR_name_len_offset, DR_name_len_size),
    isodirrec + DR_name_offset);
}
#endif

Coverage Report

Created: 2023-11-19 07:09