lxdream 0.9.1| filename | src/gdrom/cdi.c |
| changeset | 513:ae1dea71613d |
| prev | 468:3a49695e081a |
| next | 561:533f6b478071 |
| author | nkeynes |
| date | Thu Nov 22 11:10:15 2007 +0000 (16 years ago) |
| permissions | -rw-r--r-- |
| last change | Re-add "Load Binary" menu item (misplaced in GUI rewrite) Prevent running with no code loaded |
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1 /**
2 * $Id: cdi.c,v 1.10 2007-10-28 07:23:46 nkeynes Exp $
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 <fcntl.h>
23 #include <errno.h>
24 #include <sys/stat.h>
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 const 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 };
40 static const char EXT_MARKER[9] = {0,255,255,255,255,255,255,255,255 };
42 struct cdi_trailer {
43 uint32_t cdi_version;
44 uint32_t header_offset;
45 };
47 struct cdi_track_data {
48 uint32_t pregap_length;
49 uint32_t length;
50 char unknown2[6];
51 uint32_t mode;
52 char unknown3[0x0c];
53 uint32_t start_lba;
54 uint32_t total_length;
55 char unknown4[0x10];
56 uint32_t sector_size;
57 char unknown5[0x1D];
58 } __attribute__((packed));
60 gboolean cdi_image_is_valid( FILE *f )
61 {
62 int len;
63 struct cdi_trailer trail;
65 fseek( f, -8, SEEK_END );
66 len = ftell(f)+8;
67 fread( &trail, sizeof(trail), 1, f );
68 if( trail.header_offset >= len ||
69 trail.header_offset == 0 )
70 return FALSE;
71 return trail.cdi_version == CDI_V2_ID || trail.cdi_version == CDI_V3_ID ||
72 trail.cdi_version == CDI_V35_ID;
73 }
75 gdrom_disc_t cdi_image_open( const gchar *filename, FILE *f )
76 {
77 gdrom_disc_t disc = NULL;
78 gdrom_image_t image;
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, -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 }
112 image = (gdrom_image_t)disc;
114 for( i=0; i< session_count; i++ ) {
115 fread( &track_count, sizeof(track_count), 1, f );
116 if( track_count + total_tracks > 99 ) {
117 ERROR( "Invalid number of tracks, bad cdi image\n" );
118 gdrom_image_destroy_no_close(disc);
119 return NULL;
120 }
121 for( j=0; j<track_count; j++ ) {
122 struct cdi_track_data trk;
123 uint32_t new_fmt = 0;
124 uint8_t fnamelen = 0;
125 fread( &new_fmt, sizeof(new_fmt), 1, f );
126 if( new_fmt != 0 ) { /* Additional data 3.00.780+ ?? */
127 fseek( f, 8, SEEK_CUR ); /* Skip */
128 }
129 fread( marker, 20, 1, f );
130 if( memcmp( marker, TRACK_START_MARKER, 20) != 0 ) {
131 ERROR( "Track start marker not found, error reading cdi image\n" );
132 gdrom_image_destroy_no_close(disc);
133 return NULL;
134 }
135 fseek( f, 4, SEEK_CUR );
136 fread( &fnamelen, 1, 1, f );
137 fseek( f, (int)fnamelen, SEEK_CUR ); /* skip over the filename */
138 fseek( f, 19, SEEK_CUR );
139 fread( &new_fmt, sizeof(new_fmt), 1, f );
140 if( new_fmt == 0x80000000 ) {
141 fseek( f, 10, SEEK_CUR );
142 } else {
143 fseek( f, 2, SEEK_CUR );
144 }
145 fread( &trk, sizeof(trk), 1, f );
146 image->track[total_tracks].session = i;
147 image->track[total_tracks].lba = trk.start_lba + 150;
148 image->track[total_tracks].sector_count = trk.length;
149 switch( trk.mode ) {
150 case 0:
151 image->track[total_tracks].mode = GDROM_CDDA;
152 image->track[total_tracks].sector_size = 2352;
153 image->track[total_tracks].flags = 0x01;
154 if( trk.sector_size != 2 ) {
155 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
156 gdrom_image_destroy_no_close(disc);
157 return NULL;
158 }
159 break;
160 case 1:
161 image->track[total_tracks].mode = GDROM_MODE1;
162 image->track[total_tracks].sector_size = 2048;
163 image->track[total_tracks].flags = 0x41;
164 if( trk.sector_size != 0 ) {
165 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
166 gdrom_image_destroy_no_close(disc);
167 return NULL;
168 }
169 break;
170 case 2:
171 image->track[total_tracks].flags = 0x41;
172 switch( trk.sector_size ) {
173 case 0:
174 image->track[total_tracks].mode = GDROM_MODE2_XA1;
175 image->track[total_tracks].sector_size = 2048;
176 break;
177 case 1:
178 image->track[total_tracks].mode = GDROM_MODE2;
179 image->track[total_tracks].sector_size = 2336;
180 break;
181 case 2:
182 default:
183 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
184 gdrom_image_destroy_no_close(disc);
185 return NULL;
186 }
187 break;
188 default:
189 ERROR( "Unsupported track mode %d", trk.mode );
190 gdrom_image_destroy_no_close(disc);
191 return NULL;
192 }
193 image->track[total_tracks].offset = posn +
194 trk.pregap_length * image->track[total_tracks].sector_size ;
195 posn += trk.total_length * image->track[total_tracks].sector_size;
196 total_tracks++;
197 fread( marker, 1, 9, f );
198 if( memcmp( marker, EXT_MARKER, 9 ) == 0 ) {
199 fseek( f, 79, SEEK_CUR );
200 } else {
201 fseek( f, -9, SEEK_CUR );
202 }
203 }
204 fseek( f, 12, SEEK_CUR );
205 }
206 image->track_count = total_tracks;
207 return disc;
208 }
.