2 * $Id: cdi.c,v 1.4 2006-12-14 11:58:18 nkeynes Exp $
4 * CDI CD-image file support
6 * Copyright (c) 2005 Nathan Keynes.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
25 #include "gdrom/gdrom.h"
27 #define CDI_V2_ID 0x80000004
28 #define CDI_V3_ID 0x80000005
29 #define CDI_V35_ID 0x80000006
32 static gboolean cdi_image_is_valid( FILE *f );
33 static gdrom_disc_t cdi_image_open( const gchar *filename, FILE *f );
35 struct gdrom_image_class cdi_image_class = { "DiscJuggler", "cdi",
36 cdi_image_is_valid, cdi_image_open };
38 static char track_start_marker[20] = { 0,0,1,0,0,0,255,255,255,255,
39 0,0,1,0,0,0,255,255,255,255 };
43 uint32_t header_offset;
46 struct cdi_track_data {
48 uint32_t pregap_length;
54 uint32_t total_length;
58 } __attribute__((packed));
60 gboolean cdi_image_is_valid( FILE *f )
63 struct cdi_trailer trail;
65 fseek( f, -8, SEEK_END );
67 fread( &trail, sizeof(trail), 1, f );
68 if( trail.header_offset >= len ||
69 trail.header_offset == 0 )
71 return trail.cdi_version == CDI_V2_ID || trail.cdi_version == CDI_V3_ID;
74 gdrom_disc_t cdi_image_open( const gchar *filename, FILE *f )
76 gdrom_disc_t disc = NULL;
77 int fd = -1, i,j, tmp;
78 uint16_t session_count;
83 struct cdi_trailer trail;
88 fseek( f, -8, SEEK_END );
90 fread( &trail, sizeof(trail), 1, f );
91 if( trail.header_offset >= len ||
92 trail.header_offset == 0 )
95 if( trail.cdi_version == CDI_V2_ID ) trail.cdi_version = 2;
96 else if( trail.cdi_version == CDI_V3_ID ) trail.cdi_version = 3;
99 fseek( f, trail.header_offset, SEEK_SET );
100 fread( &session_count, sizeof(session_count), 1, f );
102 disc = gdrom_image_new(f);
104 for( i=0; i< session_count; i++ ) {
105 fread( &track_count, sizeof(track_count), 1, f );
106 for( j=0; j<track_count; j++ ) {
107 struct cdi_track_data trk;
108 uint32_t new_fmt = 0;
109 uint8_t fnamelen = 0;
110 fread( &new_fmt, sizeof(new_fmt), 1, f );
111 if( new_fmt != 0 ) { /* Additional data 3.00.780+ ?? */
112 fseek( f, 8, SEEK_CUR ); /* Skip */
114 fread( marker, 20, 1, f );
115 if( memcmp( marker, track_start_marker, 20) != 0 ) {
116 ERROR( "Track start marker not found, error reading cdi image\n" );
120 fseek( f, 4, SEEK_CUR );
121 fread( &fnamelen, 1, 1, f );
122 fseek( f, (int)fnamelen, SEEK_CUR ); /* skip over the filename */
123 fread( &trk, sizeof(trk), 1, f );
124 disc->track[total_tracks].session = i;
125 disc->track[total_tracks].lba = trk.start_lba + 150;
126 disc->track[total_tracks].sector_count = trk.length;
129 disc->track[total_tracks].mode = GDROM_CDDA;
130 disc->track[total_tracks].sector_size = 2352;
131 disc->track[total_tracks].flags = 0x01;
132 if( trk.sector_size != 2 ) {
133 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
139 disc->track[total_tracks].mode = GDROM_MODE1;
140 disc->track[total_tracks].sector_size = 2048;
141 disc->track[total_tracks].flags = 0x41;
142 if( trk.sector_size != 0 ) {
143 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
149 disc->track[total_tracks].flags = 0x41;
150 switch( trk.sector_size ) {
152 disc->track[total_tracks].mode = GDROM_MODE2_XA1;
153 disc->track[total_tracks].sector_size = 2048;
156 disc->track[total_tracks].mode = GDROM_MODE2;
157 disc->track[total_tracks].sector_size = 2336;
161 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
167 ERROR( "Unsupported track mode %d", trk.mode );
171 disc->track[total_tracks].offset = posn +
172 trk.pregap_length * disc->track[total_tracks].sector_size ;
173 posn += trk.total_length * disc->track[total_tracks].sector_size;
175 lseek( fd, 12, SEEK_CUR );
177 fseek( f, 90, SEEK_CUR );
179 fseek( f, 12, SEEK_CUR );
183 disc->track_count = total_tracks;
185 disc->filename = filename;
.