First cut support for extracting from ISO9660 disk images.
This seems to be able to extract a TOC and extract files from the couple of ISO images I've tested it with. Treat this as experimental proof-of-concept code for the moment. There are still a bunch of debug messages (there are a few oddities in ISO9660 that I haven't yet figured out how to handle), a lot of bugs to be addressed (this code leaks memory very badly), and a lot of missing features (no Rockridge support, in particular). I'd appreciate feedback from anyone who understands ISO9660 format better than I do. ;-) Suggested by: Robert Watson
This commit is contained in:
Tim Kientzle
parent
5d3ec186d5
commit
5d9e84da87
@ -7,7 +7,7 @@
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LIB= archive
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VERSION= 1.01.015
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VERSION= 1.01.022
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ARCHIVE_API_FEATURE= 2
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ARCHIVE_API_VERSION= 1
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SHLIB_MAJOR= ${ARCHIVE_API_VERSION}
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@ -40,6 +40,7 @@ SRCS= archive.h \
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archive_read_support_compression_none.c \
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archive_read_support_format_all.c \
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archive_read_support_format_cpio.c \
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archive_read_support_format_iso9660.c \
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archive_read_support_format_tar.c \
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archive_string.c \
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archive_string_sprintf.c \
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@ -159,6 +159,7 @@ int archive_read_support_compression_none(struct archive *);
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int archive_read_support_format_all(struct archive *);
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int archive_read_support_format_cpio(struct archive *);
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int archive_read_support_format_gnutar(struct archive *);
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int archive_read_support_format_iso9660(struct archive *);
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int archive_read_support_format_tar(struct archive *);
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521
lib/libarchive/archive_read_support_format_iso9660.c
Normal file
521
lib/libarchive/archive_read_support_format_iso9660.c
Normal file
@ -0,0 +1,521 @@
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/*-
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* Copyright (c) 2003-2004 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD$");
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#include <sys/stat.h>
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#include <errno.h>
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/* #include <stdint.h> */ /* See archive_platform.h */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "archive.h"
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#include "archive_entry.h"
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#include "archive_private.h"
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#include "archive_string.h"
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/*
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* An overview of ISO 9660 format:
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*
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* Each disk is laid out as follows:
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* * 32k reserved for private use
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* * Volume descriptor table. Each volume descriptor
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* is 2k and specifies basic format information.
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* The "Primary Volume Descriptor" (PVD) is defined by the
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* standard and should always be present; other volume
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* descriptors include various vendor-specific extensions.
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* * Files and directories. Each file/dir is specified by
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* an "extent" (starting sector and length in bytes).
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* Dirs are just files with directory records packed one
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* after another. The PVD contains a single dir entry
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* specifying the location of the root directory. Everything
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* else follows from there.
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*
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* This module works by first reading the volume descriptors, then
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* building a heap of directory entries, sorted by starting
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* sector. At each step, I look for the earliest dir entry that
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* hasn't yet been read, seek forward to that location and read
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* that entry. If it's a dir, I slurp in the new dir entries and
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* add them to the heap; if it's a regular file, I return the
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* corresponding archive_entry and wait for the client to request
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* the file body. This strategy allows us to read most compliant
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* CDs with a single pass through the data, as required by libarchive.
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*/
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/* Structure of on-disk PVD. */
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struct primary_volume_descriptor {
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unsigned char type[1];
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char id[5];
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unsigned char version[1];
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char reserved1[1];
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char system_id[32];
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char volume_id[32];
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char reserved2[8];
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char volume_space_size[8];
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char reserved3[32];
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char volume_set_size[4];
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char volume_sequence_number[4];
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char logical_block_size[4];
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char path_table_size[8];
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char type_1_path_table[4];
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char opt_type_1_path_table[4];
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char type_m_path_table[4];
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char opt_type_m_path_table[4];
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char root_directory_record[34];
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char volume_set_id[128];
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char publisher_id[128];
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char preparer_id[128];
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char application_id[128];
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char copyright_file_id[37];
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char abstract_file_id[37];
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char bibliographic_file_id[37];
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char creation_date[17];
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char modification_date[17];
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char expiration_date[17];
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char effective_date[17];
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char file_structure_version[1];
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char reserved4[1];
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char application_data[512];
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};
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/* Structure of an on-disk directory record. */
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struct directory_record {
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unsigned char length[1];
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unsigned char ext_attr_length[1];
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unsigned char extent[8];
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unsigned char size[8];
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char date[7];
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unsigned char flags[1];
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unsigned char file_unit_size[1];
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unsigned char interleave[1];
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unsigned char volume_sequence_number[4];
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unsigned char name_len[1];
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char name[1];
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};
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/*
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* Our private data.
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*/
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/* In-memory storage for a directory record. */
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struct dir_rec {
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struct dir_rec *parent;
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unsigned char flags;
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uint64_t offset; /* Offset on disk. */
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uint64_t size; /* File size in bytes. */
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time_t mtime; /* File last modified time. */
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char name[1]; /* Null-terminated filename. */
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};
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struct iso9660 {
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int magic;
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#define ISO9660_MAGIC 0x96609660
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int bid; /* If non-zero, return this as our bid. */
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struct archive_string pathname;
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/* TODO: Make this a heap for fast inserts and deletions. */
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struct dir_rec **pending_files;
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int pending_files_allocated;
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int pending_files_used;
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uint64_t current_position;
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ssize_t logical_block_size;
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off_t entry_offset;
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ssize_t entry_padding;
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ssize_t entry_bytes_remaining;
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};
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static int archive_read_format_iso9660_bid(struct archive *);
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static int archive_read_format_iso9660_cleanup(struct archive *);
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static int archive_read_format_iso9660_read_data(struct archive *,
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const void **, size_t *, off_t *);
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static int archive_read_format_iso9660_read_header(struct archive *,
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struct archive_entry *);
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static const char *build_pathname(struct archive_string *, struct dir_rec *);
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static time_t isodate(const void *);
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static int isPVD(struct iso9660 *, const char *);
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static struct dir_rec *next_entry(struct iso9660 *);
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static int store_pending(struct iso9660 *, struct dir_rec *parent,
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const struct directory_record *);
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static int toi(const void *p, int n);
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int
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archive_read_support_format_iso9660(struct archive *a)
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{
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struct iso9660 *iso9660;
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int r;
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iso9660 = malloc(sizeof(*iso9660));
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memset(iso9660, 0, sizeof(*iso9660));
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iso9660->magic = ISO9660_MAGIC;
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iso9660->bid = -1; /* We haven't yet bid. */
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r = __archive_read_register_format(a,
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iso9660,
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archive_read_format_iso9660_bid,
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archive_read_format_iso9660_read_header,
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archive_read_format_iso9660_read_data,
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archive_read_format_iso9660_cleanup);
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if (r != ARCHIVE_OK) {
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free(iso9660);
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return (r);
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}
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return (ARCHIVE_OK);
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}
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static int
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archive_read_format_iso9660_bid(struct archive *a)
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{
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struct iso9660 *iso9660;
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ssize_t bytes_read;
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const void *h;
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const char *p;
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iso9660 = *(a->pformat_data);
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if (iso9660->bid >= 0)
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return (iso9660->bid);
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/*
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* Skip the first 32k (reserved area) and get the first
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* 8 sectors of the volume descriptor table. Of course,
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* if the I/O layer gives us more, we'll take it.
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*/
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bytes_read = (a->compression_read_ahead)(a, &h, 32768 + 8*2048);
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if (bytes_read < 32768 + 8*2048)
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return (iso9660->bid = -1);
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p = (const char *)h;
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/* Skip the reserved area. */
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bytes_read -= 32768;
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p += 32768;
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/* Check each volume descriptor to locate the PVD. */
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for (; bytes_read > 2048; bytes_read -= 2048, p += 2048) {
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iso9660->bid = isPVD(iso9660, p);
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if (iso9660->bid > 0)
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return (iso9660->bid);
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}
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/* We didn't find a valid PVD; return a bid of zero. */
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iso9660->bid = 0;
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return (iso9660->bid);
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}
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static int
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isPVD(struct iso9660 *iso9660, const char *h)
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{
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const struct primary_volume_descriptor *voldesc;
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if (h[0] != 1)
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return (0);
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if (memcmp(h+1, "CD001", 5) != 0)
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return (0);
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voldesc = (const struct primary_volume_descriptor *)h;
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iso9660->logical_block_size = toi(&voldesc->logical_block_size, 2);
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/* Store the root directory in the pending list. */
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store_pending(iso9660, NULL,
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(struct directory_record *)&voldesc->root_directory_record);
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return (48);
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}
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static int
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archive_read_format_iso9660_read_header(struct archive *a,
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struct archive_entry *entry)
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{
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struct stat st;
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struct iso9660 *iso9660;
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struct dir_rec *dirrec;
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ssize_t bytes_read;
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const void *buff;
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iso9660 = *(a->pformat_data);
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/* Get the next entry that appears after the current offset. */
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dirrec = next_entry(iso9660);
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if (dirrec == NULL)
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return (ARCHIVE_EOF);
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while (dirrec->offset < iso9660->current_position) {
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archive_string_empty(&iso9660->pathname);
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fprintf(stderr, "\n ** Ignoring out-of-order file `%s' (offset 0x%0x/size %d) current offset 0x%x\n", build_pathname(&iso9660->pathname, dirrec), (unsigned int)dirrec->offset, (int)dirrec->size, (unsigned int)iso9660->current_position);
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dirrec = next_entry(iso9660);
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if (dirrec == NULL)
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return (ARCHIVE_EOF);
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}
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/* Seek forward to the start of that entry. */
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while (iso9660->current_position < dirrec->offset) {
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ssize_t step = dirrec->offset - iso9660->current_position;
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if (step > iso9660->logical_block_size)
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step = iso9660->logical_block_size;
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bytes_read = (a->compression_read_ahead)(a, &buff, step);
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if (bytes_read <= 0)
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return (ARCHIVE_FATAL);
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if (bytes_read > step)
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bytes_read = step;
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iso9660->current_position += bytes_read;
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(a->compression_read_consume)(a, bytes_read);
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}
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/* Set up the entry structure with information about this entry. */
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memset(&st, 0, sizeof(st));
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iso9660->entry_bytes_remaining = dirrec->size;
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/* The following assumes the logical block size is a power of 2. */
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iso9660->entry_padding = (iso9660->logical_block_size - 1 )
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& (-iso9660->entry_bytes_remaining);
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iso9660->entry_offset = 0;
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st.st_mode = 0444;
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if (dirrec->flags & 0x02)
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st.st_mode |= S_IFDIR;
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else
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st.st_mode |= S_IFREG;
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st.st_mtime = dirrec->mtime;
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st.st_size = iso9660->entry_bytes_remaining;
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archive_entry_copy_stat(entry, &st);
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archive_string_empty(&iso9660->pathname);
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archive_entry_set_pathname(entry,
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build_pathname(&iso9660->pathname, dirrec));
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/* If this is a directory, read in all of the entries right now. */
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if (S_ISDIR(st.st_mode)) {
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while(iso9660->entry_bytes_remaining > 0) {
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const void *block;
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const char *p;
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ssize_t step = iso9660->logical_block_size;
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if (step > iso9660->entry_bytes_remaining)
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step = iso9660->entry_bytes_remaining;
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bytes_read = (a->compression_read_ahead)(a, &block, step);
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if (bytes_read < step) {
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archive_set_error(a, -1,
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"Failed to read full block when scanning ISO9660 directory list");
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return (ARCHIVE_FATAL);
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}
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if (bytes_read > step)
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bytes_read = step;
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if (bytes_read > iso9660->entry_bytes_remaining)
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bytes_read = iso9660->entry_bytes_remaining;
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(a->compression_read_consume)(a, bytes_read);
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iso9660->current_position += bytes_read;
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iso9660->entry_bytes_remaining -= bytes_read;
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for (p = block; *p != 0; p += *p) {
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const struct directory_record *dr
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= (const struct directory_record *)p;
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/* Skip '.' entry. */
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if (dr->name_len[0] == 1
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&& dr->name[0] == '\0')
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continue;
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/* Skip '..' entry. */
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if (dr->name_len[0] == 1
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&& dr->name[0] == '\001')
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continue;
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store_pending(iso9660, dirrec, dr);
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}
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}
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}
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return (ARCHIVE_OK);
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}
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static int
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archive_read_format_iso9660_read_data(struct archive *a,
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const void **buff, size_t *size, off_t *offset)
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{
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ssize_t bytes_read;
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struct iso9660 *iso9660;
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iso9660 = *(a->pformat_data);
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if (iso9660->entry_bytes_remaining > 0) {
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bytes_read = (a->compression_read_ahead)(a, buff, 1);
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if (bytes_read <= 0)
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return (ARCHIVE_FATAL);
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if (bytes_read > iso9660->entry_bytes_remaining)
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bytes_read = iso9660->entry_bytes_remaining;
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*size = bytes_read;
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*offset = iso9660->entry_offset;
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iso9660->entry_offset += bytes_read;
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iso9660->entry_bytes_remaining -= bytes_read;
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iso9660->current_position += bytes_read;
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(a->compression_read_consume)(a, bytes_read);
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return (ARCHIVE_OK);
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} else {
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while (iso9660->entry_padding > 0) {
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bytes_read = (a->compression_read_ahead)(a, buff, 1);
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if (bytes_read <= 0)
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return (ARCHIVE_FATAL);
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if (bytes_read > iso9660->entry_padding)
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bytes_read = iso9660->entry_padding;
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iso9660->current_position += bytes_read;
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(a->compression_read_consume)(a, bytes_read);
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iso9660->entry_padding -= bytes_read;
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}
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*buff = NULL;
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*size = 0;
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*offset = iso9660->entry_offset;
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return (ARCHIVE_EOF);
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}
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}
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static int
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archive_read_format_iso9660_cleanup(struct archive *a)
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{
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struct iso9660 *iso9660;
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iso9660 = *(a->pformat_data);
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free(iso9660);
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*(a->pformat_data) = NULL;
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return (ARCHIVE_OK);
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}
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static int
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store_pending(struct iso9660 *iso9660, struct dir_rec *parent,
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const struct directory_record *isodirent)
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{
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struct dir_rec *new_dirent;
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if (iso9660->pending_files_used >= iso9660->pending_files_allocated) {
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struct dir_rec **new_pending_files;
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int new_size = iso9660->pending_files_allocated * 2;
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if (new_size < 1024)
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new_size = 1024;
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new_pending_files = malloc(new_size * sizeof(new_pending_files[0]));
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memcpy(new_pending_files, iso9660->pending_files,
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iso9660->pending_files_allocated * sizeof(new_pending_files[0]));
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if (iso9660->pending_files != NULL)
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free(iso9660->pending_files);
|
||||
iso9660->pending_files = new_pending_files;
|
||||
iso9660->pending_files_allocated = new_size;
|
||||
}
|
||||
|
||||
new_dirent = malloc(sizeof(*new_dirent) + isodirent->name_len[0] + 1);
|
||||
new_dirent->parent = parent;
|
||||
new_dirent->flags = isodirent->flags[0];
|
||||
new_dirent->offset = toi(isodirent->extent, 4)
|
||||
* iso9660->logical_block_size;
|
||||
new_dirent->size = toi(isodirent->size, 4);
|
||||
new_dirent->mtime = isodate(isodirent->date);
|
||||
memcpy(new_dirent->name, isodirent->name, isodirent->name_len[0]);
|
||||
new_dirent->name[(int)isodirent->name_len[0]] = '\0';
|
||||
|
||||
iso9660->pending_files[iso9660->pending_files_used++] = new_dirent;
|
||||
|
||||
|
||||
/* DEBUGGING */
|
||||
|
||||
if ((isodirent->flags[0] & ~0x02) != 0) {
|
||||
archive_string_empty(&iso9660->pathname);
|
||||
fprintf(stderr, "\n ** Unrecognized flag 0x%x in file %s\n",
|
||||
new_dirent->flags,
|
||||
build_pathname(&iso9660->pathname, new_dirent));
|
||||
}
|
||||
|
||||
if (toi(isodirent->volume_sequence_number,2) != 1
|
||||
|| isodirent->file_unit_size[0] != 0
|
||||
|| isodirent->interleave[0] != 0
|
||||
|| isodirent->ext_attr_length[0] != 0) {
|
||||
fprintf(stderr, "\n ** Unhandled ISO9660 directory attribute:");
|
||||
fprintf(stderr, " l %d, a %d, ext 0x%x, s %d, f 0x%02x, unt %d, ilv %d, seq %d: `%.*s' (%d)\n", isodirent->length[0], isodirent->ext_attr_length[0], toi(isodirent->extent, 4) * 2048, toi(isodirent->size, 4), isodirent->flags[0], isodirent->file_unit_size[0], isodirent->interleave[0], toi(isodirent->volume_sequence_number,2), isodirent->name_len[0], isodirent->name, isodirent->name_len[0]);
|
||||
}
|
||||
|
||||
|
||||
return (ARCHIVE_OK);
|
||||
}
|
||||
|
||||
static struct dir_rec *
|
||||
next_entry(struct iso9660 *iso9660)
|
||||
{
|
||||
int least_index = 0;
|
||||
uint64_t least_offset = iso9660->pending_files[0]->offset;
|
||||
int i;
|
||||
struct dir_rec *r;
|
||||
|
||||
if (iso9660->pending_files_used < 1)
|
||||
return (NULL);
|
||||
|
||||
for(i = 0; i < iso9660->pending_files_used; i++) {
|
||||
if (iso9660->pending_files[i]->offset < least_offset) {
|
||||
least_offset = iso9660->pending_files[i]->offset;
|
||||
least_index = i;
|
||||
}
|
||||
}
|
||||
r = iso9660->pending_files[least_index];
|
||||
iso9660->pending_files[least_index]
|
||||
= iso9660->pending_files[--iso9660->pending_files_used];
|
||||
return (r);
|
||||
}
|
||||
|
||||
static 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
|
||||
isodate(const void *p)
|
||||
{
|
||||
struct tm tm;
|
||||
const unsigned char *v = (const unsigned char *)p;
|
||||
int offset;
|
||||
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 timezone offset, in 1/4-hour increments. */
|
||||
offset = ((const signed char *)p)[6];
|
||||
tm.tm_hour += offset / 4;
|
||||
tm.tm_min += (offset % 4) * 15;
|
||||
return (timegm(&tm));
|
||||
}
|
||||
|
||||
static const char *
|
||||
build_pathname(struct archive_string *as, struct dir_rec *dr)
|
||||
{
|
||||
if (dr->parent != NULL && dr->parent->name[0] != '\0') {
|
||||
build_pathname(as, dr->parent);
|
||||
archive_strcat(as, "/");
|
||||
}
|
||||
archive_strcat(as, dr->name);
|
||||
return (as->s);
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user