290 lines
7.9 KiB
C
290 lines
7.9 KiB
C
/*
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$Id: cd_types.c,v 1.2 2003/08/31 03:35:36 rocky Exp $
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Copyright (C) 2003 Rocky Bernstein <rocky@panix.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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This tries to determine what kind of CD-image or filesystems on a
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track we've got.
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*/
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#include "config.h"
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#ifdef HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <cdio/cdio.h>
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#include <cdio/iso9660.h>
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#include <cdio/logging.h>
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#include <cdio/util.h>
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#include <cdio/cd_types.h>
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/*
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Subject: -65- How can I read an IRIX (EFS) CD-ROM on a machine which
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doesn't use EFS?
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Date: 18 Jun 1995 00:00:01 EST
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You want 'efslook', at
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ftp://viz.tamu.edu/pub/sgi/software/efslook.tar.gz.
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and
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! Robert E. Seastrom <rs@access4.digex.net>'s software (with source
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! code) for using an SGI CD-ROM on a Macintosh is at
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! ftp://bifrost.seastrom.com/pub/mac/CDROM-Jumpstart.sit151.hqx.
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*/
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static char buffer[6][CDIO_CD_FRAMESIZE_RAW]; /* for CD-Data */
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/* Some interesting sector numbers stored in the above buffer. */
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#define UFS_SUPERBLOCK_SECTOR 4 /* buffer[2] */
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#define BOOT_SECTOR 17 /* buffer[3] */
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#define VCD_INFO_SECTOR 150 /* buffer[4] */
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typedef struct signature
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{
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unsigned int buf_num;
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unsigned int offset;
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const char *sig_str;
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const char *description;
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} signature_t;
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static signature_t sigs[] =
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{
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/*buffer[x] off look for description */
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{0, 1, ISO_STANDARD_ID, "ISO 9660"},
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{0, 1, "CD-I", "CD-I"},
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{0, 8, "CDTV", "CDTV"},
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{0, 8, "CD-RTOS", "CD-RTOS"},
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{0, 9, "CDROM", "HIGH SIERRA"},
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{0, 16, "CD-BRIDGE", "BRIDGE"},
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{0, ISO_XA_MARKER_OFFSET, ISO_XA_MARKER_STRING, "XA"},
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{1, 64, "PPPPHHHHOOOOTTTTOOOO____CCCCDDDD", "PHOTO CD"},
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{1, 0x438, "\x53\xef", "EXT2 FS"},
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{2, 1372, "\x54\x19\x01\x0", "UFS"},
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{3, 7, "EL TORITO", "BOOTABLE"},
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{4, 0, "VIDEO_CD", "VIDEO CD"},
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{4, 0, "SUPERVCD", "SVCD or Chaoji VCD"},
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{ 0 }
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};
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/* The below index into the above sigs array. Make sure things match. */
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#define INDEX_ISOFS 0
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#define INDEX_CD_I 1
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#define INDEX_CDTV 2
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#define INDEX_CD_RTOS 3
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#define INDEX_HS 4
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#define INDEX_BRIDGE 5
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#define INDEX_XA 6
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#define INDEX_PHOTO_CD 7
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#define INDEX_EXT2 8
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#define INDEX_UFS 9
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#define INDEX_BOOTABLE 10
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#define INDEX_VIDEO_CD 11 /* Video CD */
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#define INDEX_SVCD 12 /* CVD *or* SVCD */
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/*
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Read a particular block into the global array to be used for further
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analysis later.
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*/
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static int
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_cdio_read_block(CdIo *cdio, int superblock, uint32_t offset, uint8_t bufnum,
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track_t track_num)
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{
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unsigned int track_sec_count = cdio_get_track_sec_count(cdio, track_num);
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memset(buffer[bufnum], 0, CDIO_CD_FRAMESIZE);
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if ( track_sec_count < superblock) {
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cdio_debug("reading block %u skipped track %d has only %u sectors\n",
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superblock, track_num, track_sec_count);
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return -1;
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}
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cdio_debug("about to read sector %u\n", offset+superblock);
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if (cdio_get_track_green(cdio, track_num)) {
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if (0 > cdio_read_mode2_sector(cdio, buffer[bufnum],
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offset+superblock, false))
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return -1;
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} else {
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if (0 > cdio_read_yellow_sector(cdio, buffer[bufnum],
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offset+superblock, false))
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return -1;
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}
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return 0;
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}
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/*
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Return true if the previously read-in buffer contains a "signature" that
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matches index "num".
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*/
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static bool
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_cdio_is_it(int num)
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{
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signature_t *sigp=&sigs[num];
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int len=strlen(sigp->sig_str);
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/* TODO: check that num < largest sig. */
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return 0 == memcmp(&buffer[sigp->buf_num][sigp->offset], sigp->sig_str, len);
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}
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static int
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_cdio_is_hfs(void)
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{
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return (0 == memcmp(&buffer[1][512],"PM",2)) ||
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(0 == memcmp(&buffer[1][512],"TS",2)) ||
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(0 == memcmp(&buffer[1][1024], "BD",2));
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}
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static int
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_cdio_is_3do(void)
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{
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return (0 == memcmp(&buffer[1][0],"\x01\x5a\x5a\x5a\x5a\x5a\x01", 7)) &&
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(0 == memcmp(&buffer[1][40], "CD-ROM", 6));
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}
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static int
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_cdio_is_joliet(void)
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{
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return 2 == buffer[3][0] && buffer[3][88] == 0x25 && buffer[3][89] == 0x2f;
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}
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/* ISO 9660 volume space in M2F1_SECTOR_SIZE byte units */
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static int
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_cdio_get_iso9660_fs_sec_count(void)
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{
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return ((buffer[0][80] & 0xff) |
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((buffer[0][81] & 0xff) << 8) |
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((buffer[0][82] & 0xff) << 16) |
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((buffer[0][83] & 0xff) << 24));
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}
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static int
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_cdio_get_joliet_level( void )
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{
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switch (buffer[3][90]) {
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case 0x40: return 1;
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case 0x43: return 2;
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case 0x45: return 3;
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}
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return 0;
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}
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/*
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Try to determine what kind of CD-image and/or filesystem we
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have at track track_num. Return information about the CD image
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is returned in cdio_analysis and the return value.
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*/
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cdio_fs_anal_t
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cdio_guess_cd_type(/*in*/ CdIo *cdio, int start_session, track_t track_num,
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/*out*/ cdio_analysis_t *cdio_analysis)
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{
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int ret = 0;
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if ( _cdio_read_block(cdio, ISO_PVD_SECTOR, start_session,
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0, track_num) < 0 )
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return CDIO_FS_UNKNOWN;
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/* We have something that smells of a filesystem. */
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if (_cdio_is_it(INDEX_CD_I) && _cdio_is_it(INDEX_CD_RTOS)
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&& !_cdio_is_it(INDEX_BRIDGE) && !_cdio_is_it(INDEX_XA)) {
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return CDIO_FS_INTERACTIVE;
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} else {
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/* read sector 0 ONLY, when NO greenbook CD-I !!!! */
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if ( _cdio_read_block(cdio, 0, start_session, 1, track_num) < 0 )
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return ret;
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if (_cdio_is_it(INDEX_HS))
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ret |= CDIO_FS_HIGH_SIERRA;
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else if (_cdio_is_it(INDEX_ISOFS)) {
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if (_cdio_is_it(INDEX_CD_RTOS) && _cdio_is_it(INDEX_BRIDGE))
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ret = CDIO_FS_ISO_9660_INTERACTIVE;
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else if (_cdio_is_hfs())
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ret = CDIO_FS_ISO_HFS;
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else
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ret = CDIO_FS_ISO_9660;
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cdio_analysis->isofs_size = _cdio_get_iso9660_fs_sec_count();
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sprintf(cdio_analysis->iso_label, buffer[0]+40);
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#if 0
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if (_cdio_is_rockridge())
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ret |= CDIO_FS_ANAL_ROCKRIDGE;
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#endif
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if (_cdio_read_block(cdio, BOOT_SECTOR, start_session, 3, track_num) < 0)
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return ret;
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if (_cdio_is_joliet()) {
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cdio_analysis->joliet_level = _cdio_get_joliet_level();
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ret |= CDIO_FS_ANAL_JOLIET;
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}
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if (_cdio_is_it(INDEX_BOOTABLE))
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ret |= CDIO_FS_ANAL_BOOTABLE;
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if (_cdio_is_it(INDEX_XA) && _cdio_is_it(INDEX_ISOFS)
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&& !_cdio_is_it(INDEX_PHOTO_CD)) {
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if ( _cdio_read_block(cdio, VCD_INFO_SECTOR, start_session, 4,
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track_num) < 0 )
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return ret;
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if (_cdio_is_it(INDEX_BRIDGE) && _cdio_is_it(INDEX_CD_RTOS)) {
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if (_cdio_is_it(INDEX_VIDEO_CD)) ret |= CDIO_FS_ANAL_VIDEOCDI;
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else if (_cdio_is_it(INDEX_SVCD)) ret |= CDIO_FS_ANAL_SVCD;
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} else if (_cdio_is_it(INDEX_SVCD)) ret |= CDIO_FS_ANAL_CVD;
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}
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}
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else if (_cdio_is_hfs()) ret |= CDIO_FS_HFS;
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else if (_cdio_is_it(INDEX_EXT2)) ret |= CDIO_FS_EXT2;
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else if (_cdio_is_3do()) ret |= CDIO_FS_3DO;
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else {
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if ( _cdio_read_block(cdio, UFS_SUPERBLOCK_SECTOR, start_session, 2,
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track_num) < 0 )
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return ret;
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if (_cdio_is_it(INDEX_UFS))
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ret |= CDIO_FS_UFS;
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else
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ret |= CDIO_FS_UNKNOWN;
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}
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}
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/* other checks */
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if (_cdio_is_it(INDEX_XA)) ret |= CDIO_FS_ANAL_XA;
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if (_cdio_is_it(INDEX_PHOTO_CD)) ret |= CDIO_FS_ANAL_PHOTO_CD;
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if (_cdio_is_it(INDEX_CDTV)) ret |= CDIO_FS_ANAL_CDTV;
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return ret;
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}
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