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minix/lib/libarchive/archive_read_support_format_iso9660.c
Ben Gras 470ab03b86 libarchive port by Gautam Tirumala.
2010-07-13 19:17:02 +00:00

2830 lines
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/*-
* Copyright (c) 2003-2007 Tim Kientzle
* Copyright (c) 2009 Andreas Henriksson <andreas@fatal.se>
* Copyright (c) 2009 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_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;
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 re; /* Having RRIP "RE" extension. */
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 */
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;
char exposed;
};
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 heap_queue re_dirs;
struct heap_queue cl_files;
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;
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;
off_t entry_sparse_offset;
int64_t entry_bytes_remaining;
struct zisofs entry_zisofs;
struct content *entry_content;
};
static int archive_read_format_iso9660_bid(struct archive_read *);
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 *, off_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 *);
#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 struct file_info *next_cache_entry(struct iso9660 *iso9660);
static int next_entry_seek(struct archive_read *a, struct iso9660 *iso9660,
struct file_info **pfile);
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 cache_add_entry(struct iso9660 *iso9660,
struct file_info *file);
static inline void cache_add_to_next_of_parent(struct iso9660 *iso9660,
struct file_info *file);
static inline struct file_info *cache_get_entry(struct iso9660 *iso9660);
static void heap_add_entry(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(iso9660, file) \
heap_add_entry(&((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;
iso9660 = (struct iso9660 *)malloc(sizeof(*iso9660));
if (iso9660 == NULL) {
archive_set_error(&a->archive, ENOMEM, "Can't allocate iso9660 data");
return (ARCHIVE_FATAL);
}
memset(iso9660, 0, sizeof(*iso9660));
iso9660->magic = ISO9660_MAGIC;
iso9660->cache_files.first = NULL;
iso9660->cache_files.last = &(iso9660->cache_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)
{
struct iso9660 *iso9660;
ssize_t bytes_read;
const void *h;
const unsigned char *p;
int seenTerminator;
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)
h = __archive_read_ahead(a,
RESERVED_AREA + 8 * LOGICAL_BLOCK_SIZE,
&bytes_read);
if (h == NULL)
return (-1);
p = (const unsigned char *)h;
/* 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 (!iso9660->primary.location) {
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 noone 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);
/* 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+SVD_type_M_path_table_offset);
if (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 <= 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);
/* 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 <= 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);
/* 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);
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;
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,
iso9660->current_position,
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);
return (ARCHIVE_WARN);
}
if (iso9660->current_position < parent->offset) {
int64_t skipsize;
skipsize = parent->offset - iso9660->current_position;
skipsize = __archive_read_skip(a, skipsize);
if (skipsize < 0)
return ((int)skipsize);
iso9660->current_position = parent->offset;
}
step = ((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);
}
__archive_read_consume(a, step);
iso9660->current_position += step;
multi = NULL;
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.
*/
/* 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);
if (child == NULL)
return (ARCHIVE_FATAL);
if (child->cl_offset)
heap_add_entry(&(iso9660->cl_files),
child, child->cl_offset);
else {
if (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");
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)
add_entry(iso9660, child);
else {
multi->size += child->size;
if (!child->multi_extent)
multi = NULL;
}
} else
add_entry(iso9660, child);
}
}
}
/* Read data which recorded by RRIP "CE" extension. */
if (read_CE(a, iso9660) != ARCHIVE_OK)
return (ARCHIVE_FATAL);
return (ARCHIVE_OK);
}
static int
relocate_dir(struct iso9660 *iso9660, struct file_info *file)
{
struct file_info *re;
re = heap_get_entry(&(iso9660->re_dirs));
while (re != NULL && re->offset < file->cl_offset) {
/* This case is wrong pattern.
* But dont't reject this directory entry to be robust. */
cache_add_entry(iso9660, re);
re = heap_get_entry(&(iso9660->re_dirs));
}
if (re == NULL)
/* This case is wrong pattern. */
return (0);
if (re->offset == file->cl_offset) {
re->parent->subdirs--;
re->parent = file->parent;
re->parent->subdirs++;
cache_add_to_next_of_parent(iso9660, re);
return (1);
} else
/* This case is wrong pattern. */
heap_add_entry(&(iso9660->re_dirs), re, re->offset);
return (0);
}
static int
read_entries(struct archive_read *a)
{
struct iso9660 *iso9660;
struct file_info *file;
int r;
iso9660 = (struct iso9660 *)(a->format->data);
while ((file = next_entry(iso9660)) != NULL &&
(file->mode & AE_IFMT) == AE_IFDIR) {
r = read_children(a, file);
if (r != ARCHIVE_OK)
return (r);
if (iso9660->seenRockridge &&
file->parent != NULL &&
file->parent->parent == NULL &&
iso9660->rr_moved == NULL &&
(strcmp(file->name.s, "rr_moved") == 0 ||
strcmp(file->name.s, ".rr_moved") == 0)) {
iso9660->rr_moved = file;
} else if (file->re)
heap_add_entry(&(iso9660->re_dirs), file,
file->offset);
else
cache_add_entry(iso9660, file);
}
if (file != NULL)
add_entry(iso9660, file);
if (iso9660->rr_moved != NULL) {
/*
* Relocate directory which rr_moved has.
*/
while ((file = heap_get_entry(&(iso9660->cl_files))) != NULL)
relocate_dir(iso9660, file);
/* If rr_moved directory still has children,
* Add rr_moved into pending_files to show
*/
if (iso9660->rr_moved->subdirs) {
cache_add_entry(iso9660, iso9660->rr_moved);
/* If entries which have "RE" extension are still
* remaining(this case is unlikely except ISO image
* is broken), the entries won't be exposed. */
while ((file = heap_get_entry(&(iso9660->re_dirs))) != NULL)
cache_add_entry(iso9660, file);
} else
iso9660->rr_moved->parent->subdirs--;
} else {
/*
* In case ISO image is broken. If the name of rr_moved
* directory has been changed by damage, subdirectories
* of rr_moved entry won't be exposed.
*/
while ((file = heap_get_entry(&(iso9660->re_dirs))) != NULL)
cache_add_entry(iso9660, file);
}
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;
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) {
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 * vd->location;
skipsize = __archive_read_skip(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);
if (file == NULL)
return (ARCHIVE_FATAL);
iso9660->seenJoliet = seenJoliet;
if (vd == &(iso9660->primary) && iso9660->seenRockridge
&& iso9660->seenJoliet)
/*
* If iso image has RockRidge and Joliet,
* we use RockRidge Extensions.
*/
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 * vd->location;
skipsize -= iso9660->current_position;
skipsize = __archive_read_skip(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);
}
seenJoliet = iso9660->seenJoliet;/* Save flag. */
iso9660->seenJoliet = 0;
file = parse_file_info(a, NULL, block);
if (file == NULL)
return (ARCHIVE_FATAL);
iso9660->seenJoliet = seenJoliet;
}
/* Store the root directory in the pending list. */
add_entry(iso9660, file);
if (iso9660->seenRockridge) {
a->archive.archive_format =
ARCHIVE_FORMAT_ISO9660_ROCKRIDGE;
a->archive.archive_format_name =
"ISO9660 with Rockridge extensions";
}
rd_r = read_entries(a);
if (rd_r == ARCHIVE_FATAL)
return (ARCHIVE_FATAL);
} else
rd_r = ARCHIVE_OK;
/* Get the next entry that appears after the current offset. */
r = next_entry_seek(a, iso9660, &file);
if (r != ARCHIVE_OK)
return (r);
iso9660->entry_bytes_remaining = file->size;
iso9660->entry_sparse_offset = 0; /* Offset for sparse-file-aware clients. */
if (file->offset + file->size > iso9660->volume_size) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"File is beyond end-of-media: %s", file->name);
iso9660->entry_bytes_remaining = 0;
iso9660->entry_sparse_offset = 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);
archive_string_empty(&iso9660->pathname);
archive_entry_set_pathname(entry,
build_pathname(&iso9660->pathname, file));
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) {
archive_entry_set_hardlink(entry,
iso9660->previous_pathname.s);
archive_entry_unset_size(entry);
iso9660->entry_bytes_remaining = 0;
iso9660->entry_sparse_offset = 0;
return (ARCHIVE_OK);
}
/* Except for the hardlink case above, if the offset of the
* next entry is before our current position, 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. */
/* TODO: Someday, libarchive's I/O core will support optional
* seeking. When that day comes, this code should attempt to
* seek and only return the error if the seek fails. That
* will give us support for whacky ISO images that require
* seeking while retaining the ability to read almost all ISO
* images in a streaming fashion. */
if ((file->mode & AE_IFMT) != AE_IFDIR &&
file->offset < iso9660->current_position) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Ignoring out-of-order file @%x (%s) %jd < %jd",
file,
iso9660->pathname.s,
file->offset, iso9660->current_position);
iso9660->entry_bytes_remaining = 0;
iso9660->entry_sparse_offset = 0;
return (ARCHIVE_WARN);
}
/* 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;
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;
iso9660->entry_sparse_offset = 0;
file->exposed = 1;
}
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, off_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 = iso9660->entry_bytes_remaining;
avail = bytes_read;
uncompressed_size = 0;
if (!zisofs->initialized) {
size_t ceil, xsize;
/* Allocate block pointers buffer. */
ceil = (zisofs->pz_uncompressed_size +
(1LL << 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 = 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 datas. */
}
/*
* 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 datas.
*/
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 = avail;
zisofs->stream.next_out = zisofs->uncompressed_buffer;
zisofs->stream.avail_out = 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 -= 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 += bytes_read;
__archive_read_consume(a, bytes_read);
return (ARCHIVE_OK);
}
#else /* HAVE_ZLIB_H */
static int
zisofs_read_data(struct archive_read *a,
const void **buff, size_t *size, off_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, off_t *offset)
{
ssize_t bytes_read;
struct iso9660 *iso9660;
iso9660 = (struct iso9660 *)(a->format->data);
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_skip(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,
iso9660->entry_content->offset,
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 = 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->current_position += bytes_read;
__archive_read_consume(a, 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);
if (iso9660->pending_files.files)
free(iso9660->pending_files.files);
if (iso9660->re_dirs.files)
free(iso9660->re_dirs.files);
if (iso9660->cl_files.files)
free(iso9660->cl_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);
(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)
{
struct iso9660 *iso9660;
struct file_info *file;
size_t name_len;
const unsigned char *rr_start, *rr_end;
const unsigned char *p;
size_t dr_len;
int32_t location;
int flags;
iso9660 = (struct iso9660 *)(a->format->data);
dr_len = (size_t)isodirrec[DR_length_offset];
name_len = (size_t)isodirrec[DR_name_len_offset];
location = archive_le32dec(isodirrec + DR_extent_offset);
/* Sanity check that dr_len needs at least 34. */
if (dr_len < 34) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Invalid length of directory record");
return (NULL);
}
/* 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 >= iso9660->volume_block) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Invalid location of extent of file");
return (NULL);
}
/* Create a new file entry and copy data from the ISO dir record. */
file = (struct file_info *)malloc(sizeof(*file));
if (file == NULL) {
archive_set_error(&a->archive, ENOMEM,
"No memory for file entry");
return (NULL);
}
memset(file, 0, sizeof(*file));
file->parent = parent;
file->offset = iso9660->logical_block_size * (uint64_t)location;
file->size = toi(isodirrec + DR_size_offset, DR_size_size);
file->mtime = isodate7(isodirrec + DR_date_offset);
file->ctime = file->atime = file->mtime;
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'.
*/
wchar_t wbuff[103+1], *wp;
const unsigned char *c;
if (name_len > 206)
name_len = 206;
/* convert BE UTF-16 to wchar_t */
for (c = p, wp = wbuff;
c < (p + name_len) &&
wp < (wbuff + sizeof(wbuff)/sizeof(*wbuff) - 1);
c += 2) {
*wp++ = (((255 & (int)c[0]) << 8) | (255 & (int)c[1]));
}
*wp = L'\0';
#if 0 /* untested code, is it at all useful on Joliet? */
/* trim trailing first version and dot from filename.
*
* Remember we where 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 (*(wp-2) == ';' && *(wp-1) == '1') {
wp-=2;
*wp = L'\0';
}
/* Chop off trailing '.' from filenames. */
if (*(wp-1) == '.')
*(--wp) = L'\0';
#endif
/* store the result in the file name field. */
archive_strappend_w_utf8(&file->name, wbuff);
} 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 location for file number.
* File number is treated as inode number to find out harlink
* target. If Rockridge extensions is being used, 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.
*/
if (file->size == 0 && location >= 0)
/* If file->size is zero, its location points wrong place.
* Dot not use it for file number.
* When location has negative value, it can be used
* for file number.
*/
file->number = -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 (p[0] == 'S' && p[1] == 'P'
&& p[2] == 7 && p[3] == 1
&& p[4] == 0xBE && p[5] == 0xEF) {
/*
* 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) {
free(file);
return (NULL);
}
} 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) && file->cl_offset == 0)
parent->subdirs++;
#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);
}
static int
parse_rockridge(struct archive_read *a, struct file_info *file,
const unsigned char *p, const unsigned char *end)
{
struct iso9660 *iso9660;
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];
/*
* Yes, each 'if' here does test p[0] again.
* Otherwise, the fall-through handling to catch
* unsupported extensions doesn't work.
*/
switch(p[0]) {
case 'C':
if (p[0] == 'C' && 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);
}
break;
}
if (p[0] == 'C' && 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;
}
/* FALLTHROUGH */
case 'N':
if (p[0] == 'N' && p[1] == 'M') {
if (version == 1) {
parse_rockridge_NM1(file,
data, data_length);
iso9660->seenRockridge = 1;
}
break;
}
/* FALLTHROUGH */
case 'P':
if (p[0] == 'P' && p[1] == 'D') {
/*
* PD extension is padding;
* contents are always ignored.
*/
break;
}
if (p[0] == 'P' && 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;
}
break;
}
if (p[0] == 'P' && 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;
}
/* FALLTHROUGH */
case 'R':
if (p[0] == 'R' && p[1] == 'E' && version == 1) {
file->re = 1;
iso9660->seenRockridge = 1;
break;
}
if (p[0] == 'R' && p[1] == 'R' && version == 1) {
/*
* RR extension comprises:
* one byte flag value
* This extension is obsolete,
* so contents are always ignored.
*/
break;
}
/* FALLTHROUGH */
case 'S':
if (p[0] == 'S' && p[1] == 'L') {
if (version == 1) {
parse_rockridge_SL1(file,
data, data_length);
iso9660->seenRockridge = 1;
}
break;
}
if (p[0] == 'S' && 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);
}
case 'T':
if (p[0] == 'T' && p[1] == 'F') {
if (version == 1) {
parse_rockridge_TF1(file,
data, data_length);
iso9660->seenRockridge = 1;
}
break;
}
/* FALLTHROUGH */
case 'Z':
if (p[0] == 'Z' && p[1] == 'F') {
if (version == 1)
parse_rockridge_ZF1(file,
data, data_length);
break;
}
/* FALLTHROUGH */
default:
/* The FALLTHROUGHs above leave us here for
* any unsupported extension. */
break;
}
p += p[2];
}
return (ARCHIVE_OK);
}
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) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Invalid location 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_errx(1, "Out of memory");
p = malloc(new_size * sizeof(p[0]));
if (p == NULL)
__archive_errx(1, "Out of memory");
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;
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 fron 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);
else if (!file->symlink_continues &&
file->symlink.s[file->symlink.length - 1] != '/')
separator = "/";
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);
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;
*pfile = file = next_cache_entry(iso9660);
if (file == NULL)
return (ARCHIVE_EOF);
/* Don't waste time seeking for zero-length bodies. */
if (file->size == 0)
file->offset = iso9660->current_position;
/* 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_skip(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 struct file_info *
next_cache_entry(struct iso9660 *iso9660)
{
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) {
while (file->parent != NULL && !file->parent->exposed) {
/* If file's parent is not exposed, it's moved
* to next entry of its parent. */
cache_add_to_next_of_parent(iso9660, file);
file = cache_get_entry(iso9660);
}
return (file);
}
file = next_entry(iso9660);
if (file == NULL)
return (NULL);
if ((file->mode & AE_IFMT) != AE_IFREG || file->number == -1)
return (file);
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 bak. */
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 offse 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)
return (file);
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;
}
return (cache_get_entry(iso9660));
}
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 void
cache_add_to_next_of_parent(struct iso9660 *iso9660, struct file_info *file)
{
file->next = file->parent->next;
file->parent->next = file;
if (iso9660->cache_files.last == &(file->parent->next))
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 void
heap_add_entry(struct heap_queue *heap, struct file_info *file, uint64_t key)
{
uint64_t file_key, parent_key;
int hole, parent;
/* 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_errx(1, "Out of memory");
new_pending_files = (struct file_info **)
malloc(new_size * sizeof(new_pending_files[0]));
if (new_pending_files == NULL)
__archive_errx(1, "Out of memory");
memcpy(new_pending_files, heap->files,
heap->allocated * sizeof(new_pending_files[0]));
if (heap->files != NULL)
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;
}
// Move parent into hole <==> move hole up tree.
heap->files[hole] = heap->files[parent];
hole = parent;
}
heap->files[0] = file;
}
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;
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;
}
return (time_from_tm(&tm));
}
static time_t
isodate17(const unsigned char *v)
{
struct tm tm;
int offset;
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;
}
return (time_from_tm(&tm));
}
static time_t
time_from_tm(struct tm *t)
{
#if 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. */
mktime(t);
/* 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)
{
if (file->parent != NULL && archive_strlen(&file->parent->name) > 0) {
build_pathname(as, file->parent);
archive_strcat(as, "/");
}
if (archive_strlen(&file->name) == 0)
archive_strcat(as, ".");
else
archive_string_concat(as, &file->name);
return (as->s);
}
#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%02x,",
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
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