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freebsd-nq/lib/libarchive/archive_read_support_format_iso9660.c
Tim Kientzle 3342e45402 "The first part is just to give more info, the latter part fixes 
an error to read files past the 32bit byte offset, for instance
on DVDs."

Submitted by:	phk@
MFC after:	10 days
2009-01-13 04:56:41 +00:00

1324 lines
40 KiB
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/*-
* Copyright (c) 2003-2007 Tim Kientzle
* 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("$FreeBSD$");
#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>
#include "archive.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.
*/
/* 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 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
/*
* Our private data.
*/
/* In-memory storage for a directory record. */
struct file_info {
struct file_info *parent;
int refcount;
uint64_t offset; /* Offset on disk. */
uint64_t size; /* File size in bytes. */
uint64_t ce_offset; /* Offset of CE */
uint64_t ce_size; /* Size of CE */
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;
ino_t inode;
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 */
};
struct iso9660 {
int magic;
#define ISO9660_MAGIC 0x96609660
struct archive_string pathname;
char seenRockridge; /* Set true if RR extensions are used. */
unsigned char suspOffset;
uint64_t previous_offset;
uint64_t previous_size;
struct archive_string previous_pathname;
/* TODO: Make this a heap for fast inserts and deletions. */
struct file_info **pending_files;
int pending_files_allocated;
int pending_files_used;
uint64_t current_position;
ssize_t logical_block_size;
uint64_t volume_size; /* Total size of volume in bytes. */
off_t entry_sparse_offset;
int64_t entry_bytes_remaining;
};
static void add_entry(struct iso9660 *iso9660, struct file_info *file);
static int archive_read_format_iso9660_bid(struct archive_read *);
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 isPVD(struct iso9660 *, const unsigned char *);
static struct file_info *next_entry(struct 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 iso9660 *iso9660,
struct file_info *parent, const unsigned char *isodirrec);
static void parse_rockridge(struct iso9660 *iso9660,
struct file_info *file, const unsigned char *start,
const unsigned char *end);
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 release_file(struct iso9660 *, struct file_info *);
static unsigned toi(const void *p, int n);
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;
r = __archive_read_register_format(a,
iso9660,
archive_read_format_iso9660_bid,
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 bid;
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.
*/
h = __archive_read_ahead(a, 32768 + 8*2048, &bytes_read);
if (h == NULL)
return (-1);
p = (const unsigned char *)h;
/* Skip the reserved area. */
bytes_read -= 32768;
p += 32768;
/* Check each volume descriptor to locate the PVD. */
for (; bytes_read > 2048; bytes_read -= 2048, p += 2048) {
bid = isPVD(iso9660, p);
if (bid > 0)
return (bid);
if (*p == '\177') /* End-of-volume-descriptor marker. */
break;
}
/* We didn't find a valid PVD; return a bid of zero. */
return (0);
}
static int
isPVD(struct iso9660 *iso9660, const unsigned char *h)
{
struct file_info *file;
int i;
/* Type of the Primary Volume Descriptor must be 1. */
if (h[PVD_type_offset] != 1)
return (0);
/* ID must be "CD001" */
if (memcmp(h + PVD_id_offset, "CD001", 5) != 0)
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. */
iso9660->logical_block_size = toi(h + PVD_logical_block_size_offset, 2);
if (iso9660->logical_block_size <= 0)
return (0);
iso9660->volume_size = iso9660->logical_block_size
* (uint64_t)toi(h + PVD_volume_space_size_offset, 4);
/* File structure version must be 1 for ISO9660/ECMA119. */
if (h[PVD_file_structure_version_offset] != 1)
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 */
/* Store the root directory in the pending list. */
file = parse_file_info(iso9660, NULL, h + PVD_root_directory_record_offset);
add_entry(iso9660, file);
return (48);
}
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;
iso9660 = (struct iso9660 *)(a->format->data);
if (!a->archive.archive_format) {
a->archive.archive_format = ARCHIVE_FORMAT_ISO9660;
a->archive.archive_format_name = "ISO9660";
}
/* 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;
release_file(iso9660, file);
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);
archive_entry_set_ino(entry, file->inode);
archive_entry_set_birthtime(entry, file->birthtime, 0);
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);
/* If this entry points to the same data as the previous
* entry, convert this into a hardlink to that entry.
* But don't bother for zero-length files. */
if (file->offset == iso9660->previous_offset
&& file->size == iso9660->previous_size
&& file->size > 0) {
archive_entry_set_hardlink(entry,
iso9660->previous_pathname.s);
iso9660->entry_bytes_remaining = 0;
iso9660->entry_sparse_offset = 0;
release_file(iso9660, file);
return (ARCHIVE_OK);
}
/* If the offset is before our current position, we can't
* seek backwards to extract it, so issue a warning. */
if (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;
release_file(iso9660, file);
return (ARCHIVE_WARN);
}
iso9660->previous_size = file->size;
iso9660->previous_offset = file->offset;
archive_strcpy(&iso9660->previous_pathname, iso9660->pathname.s);
/* If this is a directory, read in all of the entries right now. */
if (archive_entry_filetype(entry) == AE_IFDIR) {
while (iso9660->entry_bytes_remaining > 0) {
const void *block;
const unsigned char *p;
ssize_t step = iso9660->logical_block_size;
if (step > iso9660->entry_bytes_remaining)
step = iso9660->entry_bytes_remaining;
block = __archive_read_ahead(a, step, NULL);
if (block == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Failed to read full block when scanning ISO9660 directory list");
release_file(iso9660, file);
return (ARCHIVE_FATAL);
}
__archive_read_consume(a, step);
iso9660->current_position += step;
iso9660->entry_bytes_remaining -= step;
for (p = (const unsigned char *)block;
*p != 0 && p < (const unsigned char *)block + step;
p += *p) {
struct file_info *child;
/* 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(iso9660, file, p);
add_entry(iso9660, child);
if (iso9660->seenRockridge) {
a->archive.archive_format =
ARCHIVE_FORMAT_ISO9660_ROCKRIDGE;
a->archive.archive_format_name =
"ISO9660 with Rockridge extensions";
}
}
}
}
release_file(iso9660, file);
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);
}
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) {
*buff = NULL;
*size = 0;
*offset = iso9660->entry_sparse_offset;
return (ARCHIVE_EOF);
}
*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;
struct file_info *file;
iso9660 = (struct iso9660 *)(a->format->data);
while ((file = next_entry(iso9660)) != NULL)
release_file(iso9660, file);
archive_string_free(&iso9660->pathname);
archive_string_free(&iso9660->previous_pathname);
if (iso9660->pending_files)
free(iso9660->pending_files);
free(iso9660);
(a->format->data) = NULL;
return (ARCHIVE_OK);
}
/*
* 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 iso9660 *iso9660, struct file_info *parent,
const unsigned char *isodirrec)
{
struct file_info *file;
size_t name_len;
const unsigned char *rr_start, *rr_end;
const char *p;
int flags;
/* TODO: Sanity check that name_len doesn't exceed length, etc. */
/* Create a new file entry and copy data from the ISO dir record. */
file = (struct file_info *)malloc(sizeof(*file));
if (file == NULL)
return (NULL);
memset(file, 0, sizeof(*file));
file->parent = parent;
if (parent != NULL)
parent->refcount++;
file->offset = (uint64_t)toi(isodirrec + DR_extent_offset, DR_extent_size)
* iso9660->logical_block_size;
file->size = toi(isodirrec + DR_size_offset, DR_size_size);
file->mtime = isodate7(isodirrec + DR_date_offset);
file->ctime = file->atime = file->mtime;
name_len = (size_t)*(const unsigned char *)(isodirrec + DR_name_len_offset);
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) + iso9660->suspOffset;
rr_end = (const unsigned char *)isodirrec
+ *(isodirrec + DR_length_offset);
/* Chop off trailing ';1' from files. */
if (name_len > 2 && p[name_len - 1] == '1' && p[name_len - 2] == ';')
name_len -= 2;
/* Chop off trailing '.' from filenames. */
if (name_len > 1 && p[name_len - 1] == '.')
--name_len;
archive_strncpy(&file->name, p, name_len);
flags = *(isodirrec + DR_flags_offset);
if (flags & 0x02)
file->mode = AE_IFDIR | 0700;
else
file->mode = AE_IFREG | 0400;
/* Rockridge extensions overwrite information from above. */
parse_rockridge(iso9660, file, rr_start, rr_end);
#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
return (file);
}
static void
add_entry(struct iso9660 *iso9660, struct file_info *file)
{
/* Expand our pending files list as necessary. */
if (iso9660->pending_files_used >= iso9660->pending_files_allocated) {
struct file_info **new_pending_files;
int new_size = iso9660->pending_files_allocated * 2;
if (iso9660->pending_files_allocated < 1024)
new_size = 1024;
/* Overflow might keep us from growing the list. */
if (new_size <= iso9660->pending_files_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, iso9660->pending_files,
iso9660->pending_files_allocated * sizeof(new_pending_files[0]));
if (iso9660->pending_files != NULL)
free(iso9660->pending_files);
iso9660->pending_files = new_pending_files;
iso9660->pending_files_allocated = new_size;
}
iso9660->pending_files[iso9660->pending_files_used++] = file;
}
static void
parse_rockridge(struct iso9660 *iso9660, struct file_info *file,
const unsigned char *p, const unsigned char *end)
{
(void)iso9660; /* UNUSED */
file->name_continues = 0;
file->symlink_continues = 0;
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
*/
file->ce_offset = (uint64_t)toi(data, 4)
* iso9660->logical_block_size
+ toi(data + 8, 4);
file->ce_size = toi(data + 16, 4);
/* If the result is rediculous,
* ignore it. */
if (file->ce_offset + file->ce_size
> iso9660->volume_size) {
file->ce_offset = 0;
file->ce_size = 0;
}
}
break;
}
/* FALLTHROUGH */
case 'N':
if (p[0] == 'N' && p[1] == 'M') {
if (version == 1)
parse_rockridge_NM1(file,
data, data_length);
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);
}
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->inode
= toi(data + 32, 4);
}
break;
}
/* FALLTHROUGH */
case 'R':
if (p[0] == 'R' && p[1] == 'R' && version == 1) {
iso9660->seenRockridge = 1;
/*
* RR extension comprises:
* one byte flag value
*/
/* TODO: Handle RR extension. */
break;
}
/* FALLTHROUGH */
case 'S':
if (p[0] == 'S' && p[1] == 'L') {
if (version == 1)
parse_rockridge_SL1(file,
data, data_length);
break;
}
if (p[0] == 'S' && p[1] == 'P'
&& version == 1 && data_length == 3
&& data[0] == (unsigned char)'\xbe'
&& data[1] == (unsigned char)'\xef') {
/*
* 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.
*
* TODO: Add a check for 'SP' in
* first directory entry, disable all SUSP
* processing if not found.
*/
iso9660->suspOffset = data[2];
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.
*/
return;
}
case 'T':
if (p[0] == 'T' && p[1] == 'F') {
if (version == 1)
parse_rockridge_TF1(file,
data, data_length);
break;
}
/* FALLTHROUGH */
default:
/* The FALLTHROUGHs above leave us here for
* any unsupported extension. */
#if DEBUG
{
const unsigned char *t;
fprintf(stderr, "\nUnsupported RRIP extension for %s\n", file->name.s);
fprintf(stderr, " %c%c(%d):", p[0], p[1], data_length);
for (t = data; t < data + data_length && t < data + 16; t++)
fprintf(stderr, " %02x", *t);
fprintf(stderr, "\n");
}
#endif
break;
}
p += p[2];
}
}
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, data + 1, data_length - 1);
break;
case 1:
if (data_length < 2)
return;
archive_strncat(&file->name, 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 = 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);
data += 17;
data_length -= 17;
}
} else {
/* Use 7-byte time format. */
if ((flag & 1) && data_length >= 7) {
/* Create time. */
file->birthtime = isodate17(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);
data += 7;
data_length -= 7;
}
}
}
static void
parse_rockridge_SL1(struct file_info *file, const unsigned char *data,
int data_length)
{
int component_continues = 1;
if (!file->symlink_continues)
archive_string_empty(&file->symlink);
else
archive_strcat(&file->symlink, "/");
file->symlink_continues = 0;
/*
* Defined flag values:
* 0: This is the last SL record for this symbolic link
* 1: this symbolic link field continues in next SL entry
* All other values are reserved.
*/
if (data_length < 1)
return;
switch(*data) {
case 0:
break;
case 1:
file->symlink_continues = 1;
break;
default:
return;
}
++data; /* Skip flag byte. */
--data_length;
/*
* SL extension body stores "components".
* Basically, this is a complicated way of storing
* a POSIX path. It also interferes with using
* symlinks for storing non-path data. <sigh>
*
* Each component is 2 bytes (flag and length)
* possibly followed by name data.
*/
while (data_length >= 2) {
unsigned char flag = *data++;
unsigned char nlen = *data++;
data_length -= 2;
if (!component_continues)
archive_strcat(&file->symlink, "/");
component_continues = 0;
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);
component_continues = 1;
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_string_empty(&file->symlink);
archive_strcat(&file->symlink, "/");
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
release_file(struct iso9660 *iso9660, struct file_info *file)
{
struct file_info *parent;
if (file->refcount == 0) {
parent = file->parent;
archive_string_free(&file->name);
archive_string_free(&file->symlink);
free(file);
if (parent != NULL) {
parent->refcount--;
release_file(iso9660, parent);
}
}
}
static int
next_entry_seek(struct archive_read *a, struct iso9660 *iso9660,
struct file_info **pfile)
{
struct file_info *file;
uint64_t offset;
*pfile = NULL;
for (;;) {
*pfile = file = next_entry(iso9660);
if (file == NULL)
return (ARCHIVE_EOF);
/* CE area precedes actual file data? Ignore it. */
if (file->ce_offset > file->offset) {
/* fprintf(stderr, " *** Discarding CE data.\n"); */
file->ce_offset = 0;
file->ce_size = 0;
}
/* Don't waste time seeking for zero-length bodies. */
if (file->size == 0) {
file->offset = iso9660->current_position;
}
/* If CE exists, find and read it now. */
if (file->ce_offset > 0)
offset = file->ce_offset;
else
offset = file->offset;
/* Seek forward to the start of the entry. */
if (iso9660->current_position < offset) {
off_t step = offset - iso9660->current_position;
off_t bytes_read;
bytes_read = __archive_read_skip(a, step);
if (bytes_read < 0)
return (bytes_read);
iso9660->current_position = offset;
}
/* We found body of file; handle it now. */
if (offset == file->offset)
return (ARCHIVE_OK);
/* Found CE? Process it and push the file back onto list. */
if (offset == file->ce_offset) {
const void *p;
ssize_t size = file->ce_size;
const unsigned char *rr_start;
file->ce_offset = 0;
file->ce_size = 0;
p = __archive_read_ahead(a, size, NULL);
if (p == NULL)
return (ARCHIVE_FATAL);
rr_start = (const unsigned char *)p;
parse_rockridge(iso9660, file, rr_start,
rr_start + size);
__archive_read_consume(a, size);
iso9660->current_position += size;
add_entry(iso9660, file);
}
}
}
static struct file_info *
next_entry(struct iso9660 *iso9660)
{
int least_index;
uint64_t least_end_offset;
int i;
struct file_info *r;
if (iso9660->pending_files_used < 1)
return (NULL);
/* Assume the first file in the list is the earliest on disk. */
least_index = 0;
least_end_offset = iso9660->pending_files[0]->offset
+ iso9660->pending_files[0]->size;
/* Now, try to find an earlier one. */
for (i = 0; i < iso9660->pending_files_used; i++) {
/* Use the position of the file *end* as our comparison. */
uint64_t end_offset = iso9660->pending_files[i]->offset
+ iso9660->pending_files[i]->size;
if (iso9660->pending_files[i]->ce_offset > 0
&& iso9660->pending_files[i]->ce_offset < iso9660->pending_files[i]->offset)
end_offset = iso9660->pending_files[i]->ce_offset
+ iso9660->pending_files[i]->ce_size;
if (least_end_offset > end_offset) {
least_index = i;
least_end_offset = end_offset;
}
}
r = iso9660->pending_files[least_index];
iso9660->pending_files[least_index]
= iso9660->pending_files[--iso9660->pending_files_used];
return (r);
}
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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