2 * $Id: gdrom.c,v 1.10 2006-12-14 12:31:38 nkeynes Exp $
4 * GD-Rom access functions.
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.
22 #include "gdrom/ide.h"
23 #include "gdrom/gdrom.h"
24 #include "gdrom/packet.h"
27 static void gdrom_image_destroy( gdrom_disc_t );
28 static gdrom_error_t gdrom_image_read_sectors( gdrom_disc_t, uint32_t, uint32_t, int, char *, uint32_t * );
30 gdrom_image_class_t gdrom_image_classes[] = { &linux_device_class, &nrg_image_class, &cdi_image_class, NULL };
32 gdrom_disc_t gdrom_disc = NULL;
34 char *gdrom_mode_names[] = { "Mode1", "Mode2", "XA 1", "XA2", "Audio", "GD-Rom" };
35 uint32_t gdrom_sector_size[] = { 2048, 2336, 2048, 2324, 2352, 2336 };
37 gdrom_disc_t gdrom_image_open( const gchar *filename )
39 const gchar *ext = strrchr(filename, '.');
40 gdrom_disc_t disc = NULL;
42 int fd = open( filename, O_RDONLY | O_NONBLOCK );
45 gdrom_image_class_t extclz = NULL;
48 ERROR("Unable to open file '%s': %s", filename, strerror(errno));
57 ext++; /* Skip the '.' */
58 for( i=0; gdrom_image_classes[i] != NULL; i++ ) {
59 if( gdrom_image_classes[i]->extension != NULL &&
60 strcasecmp( gdrom_image_classes[i]->extension, ext ) == 0 ) {
61 extclz = gdrom_image_classes[i];
62 if( extclz->is_valid_file(f) ) {
63 disc = extclz->open_image_file(filename, f);
72 /* Okay, fall back to magic */
73 gboolean recognized = FALSE;
74 for( i=0; gdrom_image_classes[i] != NULL; i++ ) {
75 if( gdrom_image_classes[i] != extclz &&
76 gdrom_image_classes[i]->is_valid_file(f) ) {
78 disc = gdrom_image_classes[i]->open_image_file(filename, f);
85 ERROR( "Unable to open disc %s: Unsupported format", filename );
92 gdrom_disc_t gdrom_image_new( FILE *file )
94 struct gdrom_disc *disc = (struct gdrom_disc *)calloc(1, sizeof(struct gdrom_disc));
97 disc->read_sectors = gdrom_image_read_sectors;
98 disc->close = gdrom_image_destroy;
99 disc->disc_type = IDE_DISC_CDROM;
104 static void gdrom_image_destroy( gdrom_disc_t disc )
106 if( disc->file != NULL ) {
113 static gdrom_error_t gdrom_image_read_sectors( gdrom_disc_t disc, uint32_t sector,
114 uint32_t sector_count, int mode, char *buf,
117 int i, file_offset, read_len;
118 struct gdrom_track *track = NULL;
120 for( i=0; i<disc->track_count; i++ ) {
121 if( disc->track[i].lba <= sector &&
122 (sector + sector_count) <= (disc->track[i].lba + disc->track[i].sector_count) ) {
123 track = &disc->track[i];
128 return PKT_ERR_BADREAD;
130 file_offset = track->offset + track->sector_size * (sector - track->lba);
131 read_len = track->sector_size * sector_count;
135 // Temporarily comment this out - it's wrong, but...
136 // if( track->mode != GDROM_GD )
137 // return PKT_ERR_BADREADMODE;
140 switch( track->mode ) {
142 case GDROM_MODE2_XA1:
143 fseek( disc->file, file_offset, SEEK_SET );
144 fread( buf, track->sector_size, sector_count, disc->file );
147 read_len = sector_count * 2048;
148 file_offset += 8; /* skip the subheader */
149 while( sector_count > 0 ) {
150 fseek( disc->file, file_offset, SEEK_SET );
151 fread( buf, 2048, 1, disc->file );
152 file_offset += track->sector_size;
158 return PKT_ERR_BADREADMODE;
162 return PKT_ERR_BADREADMODE;
169 uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count,
170 int mode, char *buf, uint32_t *length )
172 if( gdrom_disc == NULL )
173 return PKT_ERR_NODISC; /* No media */
174 return gdrom_disc->read_sectors( gdrom_disc, sector, sector_count, mode, buf, length );
178 void gdrom_dump_disc_info( gdrom_disc_t disc ) {
180 int last_session = disc->track[disc->track_count-1].session;
181 gboolean is_bootable = FALSE;
183 INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
184 disc->track[disc->track_count-1].session + 1 );
185 if( last_session > 0 ) {
186 /* Boot track is the first data track of the last session, provided that it
187 * cannot be a single-session disc.
190 for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
191 if( disc->track[i].flags & TRACK_DATA ) {
195 if( boot_track != -1 ) {
196 char boot_sector[2048];
197 uint32_t length = sizeof(boot_sector);
198 if( disc->read_sectors( disc, disc->track[boot_track].lba, 1, GDROM_MODE1,
199 boot_sector, &length ) == PKT_ERR_OK ) {
200 bootstrap_dump(boot_sector, FALSE);
206 WARN( "Disc does not appear to be bootable" );
209 gdrom_error_t gdrom_get_toc( char *buf )
211 struct gdrom_toc *toc = (struct gdrom_toc *)buf;
214 if( gdrom_disc == NULL )
215 return PKT_ERR_NODISC;
217 for( i=0; i<gdrom_disc->track_count; i++ ) {
218 toc->track[i] = htonl( gdrom_disc->track[i].lba ) | gdrom_disc->track[i].flags;
220 toc->first = 0x0100 | gdrom_disc->track[0].flags;
221 toc->last = (gdrom_disc->track_count<<8) | gdrom_disc->track[i-1].flags;
222 toc->leadout = htonl(gdrom_disc->track[i-1].lba + gdrom_disc->track[i-1].sector_count) |
223 gdrom_disc->track[i-1].flags;
225 toc->track[i] = 0xFFFFFFFF;
229 gdrom_error_t gdrom_get_info( char *buf, int session )
231 if( gdrom_disc == NULL )
232 return PKT_ERR_NODISC;
233 struct gdrom_track *last_track = &gdrom_disc->track[gdrom_disc->track_count-1];
234 unsigned int end_of_disc = last_track->lba + last_track->sector_count;
236 buf[0] = 0x01; /* Disc status? */
240 buf[2] = last_track->session+1; /* last session */
241 buf[3] = (end_of_disc >> 16) & 0xFF;
242 buf[4] = (end_of_disc >> 8) & 0xFF;
243 buf[5] = end_of_disc & 0xFF;
247 for( i=0; i<gdrom_disc->track_count; i++ ) {
248 if( gdrom_disc->track[i].session == session ) {
249 buf[2] = i+1; /* first track of session */
250 buf[3] = (gdrom_disc->track[i].lba >> 16) & 0xFF;
251 buf[4] = (gdrom_disc->track[i].lba >> 8) & 0xFF;
252 buf[5] = gdrom_disc->track[i].lba & 0xFF;
256 return PKT_ERR_BADFIELD; /* No such session */
261 void gdrom_mount_disc( gdrom_disc_t disc )
263 gdrom_unmount_disc();
265 idereg.disc = disc->disc_type | IDE_DISC_READY;
266 gdrom_dump_disc_info( disc );
269 gdrom_disc_t gdrom_mount_image( const gchar *filename )
271 gdrom_disc_t disc = gdrom_image_open(filename);
273 gdrom_mount_disc( disc );
277 void gdrom_unmount_disc( )
279 if( gdrom_disc != NULL ) {
280 gdrom_disc->close(gdrom_disc);
283 idereg.disc = IDE_DISC_NONE;
286 gboolean gdrom_is_mounted( void )
288 return gdrom_disc != NULL;
.