filename | src/gdrom/cdi.c |
changeset | 347:e686be8b10df |
prev | 342:850502f0e8de |
next | 422:61a0598e07ff |
author | nkeynes |
date | Wed Sep 12 09:20:38 2007 +0000 (16 years ago) |
permissions | -rw-r--r-- |
last change | Start splitting the common SH4 parts into sh4.c, with sh4core.c to become just the emulation core. |
view | annotate | diff | log | raw |
1 /**
2 * $Id: cdi.c,v 1.6 2007-02-04 11:30:41 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 char unknown[0x19];
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 }
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 fd = -1, i,j, tmp;
80 uint16_t session_count;
81 uint16_t track_count;
82 int total_tracks = 0;
83 int posn = 0, hdr;
84 long len;
85 struct cdi_trailer trail;
86 uint32_t new_fmt;
87 char tmpc;
88 char marker[20];
90 fseek( f, -8, SEEK_END );
91 len = ftell(f)+8;
92 fread( &trail, sizeof(trail), 1, f );
93 if( trail.header_offset >= len ||
94 trail.header_offset == 0 )
95 return NULL;
97 if( trail.cdi_version == CDI_V2_ID ) trail.cdi_version = 2;
98 else if( trail.cdi_version == CDI_V3_ID ) trail.cdi_version = 3;
99 else return NULL;
101 fseek( f, trail.header_offset, SEEK_SET );
102 fread( &session_count, sizeof(session_count), 1, f );
104 disc = gdrom_image_new(f);
105 if( disc == NULL ) {
106 fclose(f);
107 ERROR("Unable to allocate memory!");
108 return NULL;
109 }
110 image = (gdrom_image_t)disc;
112 for( i=0; i< session_count; i++ ) {
113 fread( &track_count, sizeof(track_count), 1, f );
114 if( track_count + total_tracks > 99 ) {
115 ERROR( "Invalid number of tracks, bad cdi image\n" );
116 disc->close(disc);
117 return NULL;
118 }
119 for( j=0; j<track_count; j++ ) {
120 struct cdi_track_data trk;
121 uint32_t new_fmt = 0;
122 uint8_t fnamelen = 0;
123 fread( &new_fmt, sizeof(new_fmt), 1, f );
124 if( new_fmt != 0 ) { /* Additional data 3.00.780+ ?? */
125 fseek( f, 8, SEEK_CUR ); /* Skip */
126 }
127 fread( marker, 20, 1, f );
128 if( memcmp( marker, TRACK_START_MARKER, 20) != 0 ) {
129 ERROR( "Track start marker not found, error reading cdi image\n" );
130 disc->close(disc);
131 return NULL;
132 }
133 fseek( f, 4, SEEK_CUR );
134 fread( &fnamelen, 1, 1, f );
135 fseek( f, (int)fnamelen, SEEK_CUR ); /* skip over the filename */
136 fread( &trk, sizeof(trk), 1, f );
137 image->track[total_tracks].session = i;
138 image->track[total_tracks].lba = trk.start_lba + 150;
139 image->track[total_tracks].sector_count = trk.length;
140 switch( trk.mode ) {
141 case 0:
142 image->track[total_tracks].mode = GDROM_CDDA;
143 image->track[total_tracks].sector_size = 2352;
144 image->track[total_tracks].flags = 0x01;
145 if( trk.sector_size != 2 ) {
146 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
147 disc->close(disc);
148 return NULL;
149 }
150 break;
151 case 1:
152 image->track[total_tracks].mode = GDROM_MODE1;
153 image->track[total_tracks].sector_size = 2048;
154 image->track[total_tracks].flags = 0x41;
155 if( trk.sector_size != 0 ) {
156 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
157 disc->close(disc);
158 return NULL;
159 }
160 break;
161 case 2:
162 image->track[total_tracks].flags = 0x41;
163 switch( trk.sector_size ) {
164 case 0:
165 image->track[total_tracks].mode = GDROM_MODE2_XA1;
166 image->track[total_tracks].sector_size = 2048;
167 break;
168 case 1:
169 image->track[total_tracks].mode = GDROM_MODE2;
170 image->track[total_tracks].sector_size = 2336;
171 break;
172 case 2:
173 default:
174 ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
175 disc->close(disc);
176 return NULL;
177 }
178 break;
179 default:
180 ERROR( "Unsupported track mode %d", trk.mode );
181 disc->close(disc);
182 return NULL;
183 }
184 image->track[total_tracks].offset = posn +
185 trk.pregap_length * image->track[total_tracks].sector_size ;
186 posn += trk.total_length * image->track[total_tracks].sector_size;
187 total_tracks++;
188 fread( marker, 1, 9, f );
189 if( memcmp( marker, EXT_MARKER, 9 ) == 0 ) {
190 fseek( f, 91, SEEK_CUR );
191 } else {
192 fseek( f, 3, SEEK_CUR );
193 }
194 }
195 }
196 image->track_count = total_tracks;
197 image->filename = filename;
198 return disc;
199 }
.