nkeynes@31: /**
nkeynes@561:  * $Id$
nkeynes@31:  *
nkeynes@31:  * CDI CD-image file support
nkeynes@31:  *
nkeynes@31:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@31:  *
nkeynes@31:  * This program is free software; you can redistribute it and/or modify
nkeynes@31:  * it under the terms of the GNU General Public License as published by
nkeynes@31:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@31:  * (at your option) any later version.
nkeynes@31:  *
nkeynes@31:  * This program is distributed in the hope that it will be useful,
nkeynes@31:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@31:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@31:  * GNU General Public License for more details.
nkeynes@31:  */
nkeynes@1: 
nkeynes@1: #include <stdlib.h>
nkeynes@1: #include <stdio.h>
nkeynes@1: #include <stdint.h>
nkeynes@759: #include <string.h>
nkeynes@1: #include <fcntl.h>
nkeynes@1: #include <errno.h>
nkeynes@1: #include <sys/stat.h>
nkeynes@1097: #include "drivers/cdrom/cdimpl.h"
nkeynes@1: 
nkeynes@168: #define CDI_V2_ID 0x80000004
nkeynes@168: #define CDI_V3_ID 0x80000005
nkeynes@168: #define CDI_V35_ID 0x80000006
nkeynes@168: 
nkeynes@168: 
nkeynes@168: static gboolean cdi_image_is_valid( FILE *f );
nkeynes@1097: static gboolean cdi_image_read_toc( cdrom_disc_t disc, ERROR *err );
nkeynes@168: 
nkeynes@1097: struct cdrom_disc_factory cdi_disc_factory = { "DiscJuggler", "cdi",
nkeynes@1097:         cdi_image_is_valid, NULL, cdi_image_read_toc };
nkeynes@1: 
nkeynes@347: static const char TRACK_START_MARKER[20] = { 0,0,1,0,0,0,255,255,255,255,
nkeynes@736:         0,0,1,0,0,0,255,255,255,255 };
nkeynes@347: static const char EXT_MARKER[9] = {0,255,255,255,255,255,255,255,255 };
nkeynes@1: 
nkeynes@1: struct cdi_trailer {
nkeynes@1:     uint32_t cdi_version;
nkeynes@1:     uint32_t header_offset;
nkeynes@1: };
nkeynes@1: 
nkeynes@1: struct cdi_track_data {
nkeynes@1:     uint32_t pregap_length;
nkeynes@1:     uint32_t length;
nkeynes@1:     char unknown2[6];
nkeynes@1:     uint32_t mode;
nkeynes@1:     char unknown3[0x0c];
nkeynes@1:     uint32_t start_lba;
nkeynes@1:     uint32_t total_length;
nkeynes@1:     char unknown4[0x10];
nkeynes@1:     uint32_t sector_size;
nkeynes@1:     char unknown5[0x1D];
nkeynes@1: } __attribute__((packed));
nkeynes@1: 
nkeynes@168: gboolean cdi_image_is_valid( FILE *f )
nkeynes@1: {
nkeynes@168:     int len;
nkeynes@168:     struct cdi_trailer trail;
nkeynes@1: 
nkeynes@168:     fseek( f, -8, SEEK_END );
nkeynes@168:     len = ftell(f)+8;
nkeynes@168:     fread( &trail, sizeof(trail), 1, f );
nkeynes@168:     if( trail.header_offset >= len ||
nkeynes@736:             trail.header_offset == 0 )
nkeynes@736:         return FALSE;
nkeynes@453:     return trail.cdi_version == CDI_V2_ID || trail.cdi_version == CDI_V3_ID ||
nkeynes@736:     trail.cdi_version == CDI_V35_ID;
nkeynes@168: }
nkeynes@168: 
nkeynes@1109: #define RETURN_PARSE_ERROR( ... ) do { SET_ERROR(err, LX_ERR_FILE_INVALID, __VA_ARGS__); return FALSE; } while(0)
nkeynes@1097: 
nkeynes@1097: static gboolean cdi_image_read_toc( cdrom_disc_t disc, ERROR *err )
nkeynes@168: {
nkeynes@422:     int i,j;
nkeynes@168:     uint16_t session_count;
nkeynes@168:     uint16_t track_count;
nkeynes@168:     int total_tracks = 0;
nkeynes@422:     int posn = 0;
nkeynes@1:     long len;
nkeynes@1:     struct cdi_trailer trail;
nkeynes@1:     char marker[20];
nkeynes@1: 
nkeynes@1097:     FILE *f = cdrom_disc_get_base_file(disc);
nkeynes@168:     fseek( f, -8, SEEK_END );
nkeynes@168:     len = ftell(f)+8;
nkeynes@168:     fread( &trail, sizeof(trail), 1, f );
nkeynes@168:     if( trail.header_offset >= len ||
nkeynes@1097:             trail.header_offset == 0 ) {
nkeynes@1097:         RETURN_PARSE_ERROR( "Invalid CDI image" );
nkeynes@1097:     }
nkeynes@736: 
nkeynes@453:     if( trail.cdi_version != CDI_V2_ID && trail.cdi_version != CDI_V3_ID &&
nkeynes@736:             trail.cdi_version != CDI_V35_ID ) {
nkeynes@1097:         RETURN_PARSE_ERROR( "Invalid CDI image" );
nkeynes@453:     }
nkeynes@1: 
nkeynes@453:     if( trail.cdi_version == CDI_V35_ID ) {
nkeynes@999:         fseek( f, -(long)trail.header_offset, SEEK_END );
nkeynes@453:     } else {
nkeynes@736:         fseek( f, trail.header_offset, SEEK_SET );
nkeynes@453:     }
nkeynes@168:     fread( &session_count, sizeof(session_count), 1, f );
nkeynes@736: 
nkeynes@168:     for( i=0; i< session_count; i++ ) {        
nkeynes@736:         fread( &track_count, sizeof(track_count), 1, f );
nkeynes@736:         if( track_count + total_tracks > 99 ) {
nkeynes@1097:             RETURN_PARSE_ERROR("Invalid number of tracks, bad cdi image" );
nkeynes@736:         }
nkeynes@168:         for( j=0; j<track_count; j++ ) {
nkeynes@1:             struct cdi_track_data trk;
nkeynes@168:             uint32_t new_fmt = 0;
nkeynes@736:             uint8_t fnamelen = 0;
nkeynes@168:             fread( &new_fmt, sizeof(new_fmt), 1, f );
nkeynes@1:             if( new_fmt != 0 ) { /* Additional data 3.00.780+ ?? */
nkeynes@736:                 fseek( f, 8, SEEK_CUR ); /* Skip */
nkeynes@1:             }
nkeynes@168:             fread( marker, 20, 1, f );
nkeynes@347:             if( memcmp( marker, TRACK_START_MARKER, 20) != 0 ) {
nkeynes@1097:                 RETURN_PARSE_ERROR( "Track start marker not found, error reading cdi image" );
nkeynes@736:             }
nkeynes@736:             fseek( f, 4, SEEK_CUR );
nkeynes@168:             fread( &fnamelen, 1, 1, f );
nkeynes@168:             fseek( f, (int)fnamelen, SEEK_CUR ); /* skip over the filename */
nkeynes@736:             fseek( f, 19, SEEK_CUR );
nkeynes@736:             fread( &new_fmt, sizeof(new_fmt), 1, f );
nkeynes@736:             if( new_fmt == 0x80000000 ) {
nkeynes@736:                 fseek( f, 10, SEEK_CUR );
nkeynes@736:             } else {
nkeynes@736:                 fseek( f, 2, SEEK_CUR );
nkeynes@736:             }
nkeynes@168:             fread( &trk, sizeof(trk), 1, f );
nkeynes@1097:             disc->track[total_tracks].sessionno = i+1;
nkeynes@1097:             disc->track[total_tracks].lba = trk.start_lba;
nkeynes@1097:             cdrom_count_t sector_count = trk.length;
nkeynes@1097:             sector_mode_t mode;
nkeynes@736:             switch( trk.mode ) {
nkeynes@736:             case 0:
nkeynes@1097:                 mode = SECTOR_CDDA;
nkeynes@1023:                 disc->track[total_tracks].flags = 0x01;
nkeynes@736:                 if( trk.sector_size != 2 ) {
nkeynes@1097:                     RETURN_PARSE_ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
nkeynes@736:                 }
nkeynes@736:                 break;
nkeynes@736:             case 1:
nkeynes@1097:                 mode = SECTOR_MODE1;
nkeynes@1023:                 disc->track[total_tracks].flags = 0x41;
nkeynes@736:                 if( trk.sector_size != 0 ) {
nkeynes@1097:                     RETURN_PARSE_ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
nkeynes@736:                 }
nkeynes@736:                 break;
nkeynes@736:             case 2:
nkeynes@1023:                 disc->track[total_tracks].flags = 0x41;
nkeynes@736:                 switch( trk.sector_size ) {
nkeynes@736:                 case 0:
nkeynes@1097:                     mode = SECTOR_MODE2_FORM1;
nkeynes@736:                     break;
nkeynes@736:                 case 1:
nkeynes@1097:                     mode = SECTOR_SEMIRAW_MODE2;
nkeynes@736:                     break;
nkeynes@736:                 case 2:
nkeynes@736:                 default:
nkeynes@1097:                     RETURN_PARSE_ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
nkeynes@736:                 }
nkeynes@736:                 break;
nkeynes@1097:             default:
nkeynes@1097:                 RETURN_PARSE_ERROR( "Unsupported track mode %d", trk.mode );
nkeynes@736:             }
nkeynes@1097:             uint32_t offset = posn +
nkeynes@1097:                     trk.pregap_length * CDROM_SECTOR_SIZE(mode);
nkeynes@1097:             disc->track[total_tracks].source = file_sector_source_new_source( disc->base_source, mode, offset, sector_count );
nkeynes@1097:             posn += trk.total_length * CDROM_SECTOR_SIZE(mode);
nkeynes@736:             total_tracks++;
nkeynes@736:             fread( marker, 1, 9, f );
nkeynes@736:             if( memcmp( marker, EXT_MARKER, 9 ) == 0 ) {
nkeynes@736:                 fseek( f, 79, SEEK_CUR );
nkeynes@736:             } else {
nkeynes@736:                 fseek( f, -9, SEEK_CUR );
nkeynes@736:             }
nkeynes@736:         }
nkeynes@736:         fseek( f, 12, SEEK_CUR );
nkeynes@1:     }
nkeynes@1097: 
nkeynes@1023:     disc->track_count = total_tracks;
nkeynes@1097:     disc->session_count = session_count;
nkeynes@1097:     return TRUE;
nkeynes@1: }