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archive_read_support_format_iso9660.c
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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) 2009-2011 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 beging 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;
};
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 *);
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);
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,
archive_read_format_iso9660_cleanup);
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
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)
{
int i;
(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. */
for (i = 7; i < 2048; ++i)
if (h[i] != 0)
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;
int i;
(void)iso9660; /* UNUSED */
/* Type 2 means it's a SVD. */
if (h[SVD_type_offset] != 2)
return (0);
/* Reserved field must be 0. */
for (i = 0; i < SVD_reserved1_size; ++i)
if (h[SVD_reserved1_offset + i] != 0)
return (0);
for (i = 0; i < SVD_reserved2_size; ++i)
if (h[SVD_reserved2_offset + i] != 0)
return (0);
for (i = 0; i < SVD_reserved3_size; ++i)
if (h[SVD_reserved3_offset + i] != 0)
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;
int i;
(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. */
for (i = 0; i < PVD_reserved2_size; ++i)
if (h[PVD_reserved2_offset + i] != 0)
return (0);
/* Reserved field must be 0. */
for (i = 0; i < PVD_reserved3_size; ++i)
if (h[PVD_reserved3_offset + i] != 0)
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. */
for (i = 0; i < PVD_reserved4_size; ++i)
if (h[PVD_reserved4_offset + i] != 0)
return (0);
/* Reserved field must be 0. */
for (i = 0; i < PVD_reserved5_size; ++i)
if (h[PVD_reserved5_offset + i] != 0)
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. */
for (i = 0; i < PVD_reserved2_size; ++i)
if (h[PVD_reserved2_offset + i] != 0)
return (0);
/* Reserved field must be 0. */
for (i = 0; i < PVD_reserved3_size; ++i)
if (h[PVD_reserved3_offset + i] != 0)
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. */
for (i = 0; i < PVD_reserved5_size; ++i)
if (h[PVD_reserved5_offset + i] != 0)
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);
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 < 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.
*/