filename | src/gdrom/cdi.c |
changeset | 1030:864417a57662 |
prev | 1023:264e2fd90be8 |
author | nkeynes |
date | Sun Jun 28 12:08:16 2009 +0000 (14 years ago) |
permissions | -rw-r--r-- |
last change | Fix creating first VMU (failed to add to list) Fix device-changed causing second device-changed to fire |
view | annotate | diff | log | raw |
1 /**
2 * $Id$
3 *
4 * CDI CD-image file support
5 *
6 * Copyright (c) 2005 Nathan Keynes.
7 *
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.
12 *
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.
17 */
19 #include <stdlib.h>
20 #include <stdio.h>
21 #include <stdint.h>
22 #include <string.h>
23 #include <fcntl.h>
24 #include <errno.h>
25 #include <sys/stat.h>
26 #include "gdrom/gddriver.h"
28 #define CDI_V2_ID 0x80000004
29 #define CDI_V3_ID 0x80000005
30 #define CDI_V35_ID 0x80000006
33 static gboolean cdi_image_is_valid( FILE *f );
34 static gdrom_disc_t cdi_image_open( const gchar *filename, FILE *f );
36 struct gdrom_image_class cdi_image_class = { "DiscJuggler", "cdi",
37 cdi_image_is_valid, cdi_image_open };
39 static const char TRACK_START_MARKER[20] = { 0,0,1,0,0,0,255,255,255,255,
40 0,0,1,0,0,0,255,255,255,255 };
41 static const char EXT_MARKER[9] = {0,255,255,255,255,255,255,255,255 };
43 struct cdi_trailer {
44 uint32_t cdi_version;
45 uint32_t header_offset;
46 };
48 struct cdi_track_data {
49 uint32_t pregap_length;
50 uint32_t length;
51 char unknown2[6];
52 uint32_t mode;
53 char unknown3[0x0c];
54 uint32_t start_lba;
55 uint32_t total_length;
56 char unknown4[0x10];
57 uint32_t sector_size;
58 char unknown5[0x1D];
59 } __attribute__((packed));
61 gboolean cdi_image_is_valid( FILE *f )
62 {
63 int len;
64 struct cdi_trailer trail;
66 fseek( f, -8, SEEK_END );
67 len = ftell(f)+8;
68 fread( &trail, sizeof(trail), 1, f );
69 if( trail.header_offset >= len ||
70 trail.header_offset == 0 )
71 return FALSE;
72 return trail.cdi_version == CDI_V2_ID || trail.cdi_version == CDI_V3_ID ||
73 trail.cdi_version == CDI_V35_ID;
74 }
76 gdrom_disc_t cdi_image_open( const gchar *filename, FILE *f )
77 {
78 gdrom_disc_t disc = NULL;
79 int i,j;
80 uint16_t session_count;
81 uint16_t track_count;
82 int total_tracks = 0;
83 int posn = 0;
84 long len;
85 struct cdi_trailer trail;
86 char marker[20];
88 fseek( f, -8, SEEK_END );
89 len = ftell(f)+8;
90 fread( &trail, sizeof(trail), 1, f );
91 if( trail.header_offset >= len ||
92 trail.header_offset == 0 )
93 return NULL;
95 if( trail.cdi_version != CDI_V2_ID && trail.cdi_version != CDI_V3_ID &&
96 trail.cdi_version != CDI_V35_ID ) {
97 return NULL;
98 }
100 if( trail.cdi_version == CDI_V35_ID ) {
101 fseek( f, -(long)trail.header_offset, SEEK_END );
102 } else {
103 fseek( f, trail.header_offset, SEEK_SET );
104 }
105 fread( &session_count, sizeof(session_count), 1, f );
107 disc = gdrom_image_new(filename, f);
108 if( disc == NULL ) {
109 ERROR("Unable to allocate memory!");
110 return NULL;
111 }
113 for( i=0; i< session_count; i++ ) {
114 fread( &track_count, sizeof(track_count), 1, f );
115 if( track_count + total_tracks > 99 ) {
116 ERROR( "Invalid number of tracks, bad cdi image\n" );
117 disc->destroy(disc,FALSE);
118 return NULL;
119 }
120 for( j=0; j<track_count; j++ ) {
121 struct cdi_track_data trk;
122 uint32_t new_fmt = 0;
123 uint8_t fnamelen = 0;
124 fread( &new_fmt, sizeof(new_fmt), 1, f );
125 if( new_fmt != 0 ) { /* Additional data 3.00.780+ ?? */
126 fseek( f, 8, SEEK_CUR ); /* Skip */
127 }
128 fread( marker, 20, 1, f );
129 if( memcmp( marker, TRACK_START_MARKER, 20) != 0 ) {
130 ERROR( "Track start marker not found, error reading cdi image\n" );
131 disc->destroy(disc,FALSE);
132 return NULL;
133 }
134 fseek( f, 4, SEEK_CUR );
135 fread( &fnamelen, 1, 1, f );
136 fseek( f, (int)fnamelen, SEEK_CUR ); /* skip over the filename */
137 fseek( f, 19, SEEK_CUR );
138 fread( &new_fmt, sizeof(new_fmt), 1, f );
139 if( new_fmt == 0x80000000 ) {
140 fseek( f, 10, SEEK_CUR );
141 } else {
142 fseek( f, 2, SEEK_CUR );
143 }
144 fread( &trk, sizeof(trk), 1, f );
145 disc->track[total_tracks].session = i;
146 disc->track[total_tracks].lba = trk.start_lba + 150;
147 disc->track[total_tracks].sector_count = trk.length;
148 switch( trk.mode ) {
149 case 0:
150 disc->track[total_tracks].mode = GDROM_CDDA;
151 disc->track[total_tracks].sector_size = 2352;
152 disc->track[total_tracks].flags = 0x01;
153 if( trk.sector_size != 2 ) {
154 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
155 disc->destroy(disc,FALSE);
156 return NULL;
157 }
158 break;
159 case 1:
160 disc->track[total_tracks].mode = GDROM_MODE1;
161 disc->track[total_tracks].sector_size = 2048;
162 disc->track[total_tracks].flags = 0x41;
163 if( trk.sector_size != 0 ) {
164 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
165 disc->destroy(disc,FALSE);
166 return NULL;
167 }
168 break;
169 case 2:
170 disc->track[total_tracks].flags = 0x41;
171 switch( trk.sector_size ) {
172 case 0:
173 disc->track[total_tracks].mode = GDROM_MODE2_FORM1;
174 disc->track[total_tracks].sector_size = 2048;
175 break;
176 case 1:
177 disc->track[total_tracks].mode = GDROM_SEMIRAW_MODE2;
178 disc->track[total_tracks].sector_size = 2336;
179 break;
180 case 2:
181 default:
182 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
183 disc->destroy(disc,FALSE);
184 return NULL;
185 }
186 break;
187 default:
188 ERROR( "Unsupported track mode %d", trk.mode );
189 disc->destroy(disc,FALSE);
190 return NULL;
191 }
192 disc->track[total_tracks].offset = posn +
193 trk.pregap_length * disc->track[total_tracks].sector_size ;
194 posn += trk.total_length * disc->track[total_tracks].sector_size;
195 total_tracks++;
196 fread( marker, 1, 9, f );
197 if( memcmp( marker, EXT_MARKER, 9 ) == 0 ) {
198 fseek( f, 79, SEEK_CUR );
199 } else {
200 fseek( f, -9, SEEK_CUR );
201 }
202 }
203 fseek( f, 12, SEEK_CUR );
204 }
205 disc->track_count = total_tracks;
206 gdrom_set_disc_type(disc);
207 return disc;
208 }
.