2 * $Id: gdrom.c,v 1.9 2006-06-26 10:30:42 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.
21 #include "gdrom/ide.h"
22 #include "gdrom/gdrom.h"
23 #include "gdrom/packet.h"
26 static void gdrom_image_destroy( gdrom_disc_t );
27 static gdrom_error_t gdrom_image_read_sectors( gdrom_disc_t, uint32_t, uint32_t, int, char *, uint32_t * );
29 gdrom_image_class_t gdrom_image_classes[] = { &nrg_image_class, &cdi_image_class, NULL };
31 gdrom_disc_t gdrom_disc = NULL;
33 char *gdrom_mode_names[] = { "Mode1", "Mode2", "XA 1", "XA2", "Audio", "GD-Rom" };
34 uint32_t gdrom_sector_size[] = { 2048, 2336, 2048, 2324, 2352, 2336 };
36 gdrom_disc_t gdrom_image_open( const gchar *filename )
38 const gchar *ext = strrchr(filename, '.');
39 gdrom_disc_t disc = NULL;
40 FILE *f = fopen(filename, "ro");
42 gdrom_image_class_t extclz = NULL;
45 ERROR("Unable to open file '%s': %s", filename, strerror(errno));
51 ext++; /* Skip the '.' */
52 for( i=0; gdrom_image_classes[i] != NULL; i++ ) {
53 if( strcasecmp( gdrom_image_classes[i]->extension, ext ) == 0 ) {
54 extclz = gdrom_image_classes[i];
55 if( extclz->is_valid_file(f) ) {
56 disc = extclz->open_image_file(filename, f);
65 /* Okay, fall back to magic */
66 for( i=0; gdrom_image_classes[i] != NULL; i++ ) {
67 if( gdrom_image_classes[i] != extclz &&
68 gdrom_image_classes[i]->is_valid_file(f) ) {
69 disc = gdrom_image_classes[i]->open_image_file(filename, f);
80 gdrom_disc_t gdrom_image_new( FILE *file )
82 struct gdrom_disc *disc = (struct gdrom_disc *)calloc(1, sizeof(struct gdrom_disc));
85 disc->read_sectors = gdrom_image_read_sectors;
86 disc->close = gdrom_image_destroy;
87 disc->disc_type = IDE_DISC_CDROM;
92 static void gdrom_image_destroy( gdrom_disc_t disc )
94 if( disc->file != NULL ) {
101 static gdrom_error_t gdrom_image_read_sectors( gdrom_disc_t disc, uint32_t sector,
102 uint32_t sector_count, int mode, char *buf,
105 int i, file_offset, read_len;
106 struct gdrom_track *track = NULL;
108 for( i=0; i<disc->track_count; i++ ) {
109 if( disc->track[i].lba <= sector &&
110 (sector + sector_count) <= (disc->track[i].lba + disc->track[i].sector_count) ) {
111 track = &disc->track[i];
116 return PKT_ERR_BADREAD;
118 file_offset = track->offset + track->sector_size * (sector - track->lba);
119 read_len = track->sector_size * sector_count;
123 // Temporarily comment this out - it's wrong, but...
124 // if( track->mode != GDROM_GD )
125 // return PKT_ERR_BADREADMODE;
128 switch( track->mode ) {
130 case GDROM_MODE2_XA1:
131 fseek( disc->file, file_offset, SEEK_SET );
132 fread( buf, track->sector_size, sector_count, disc->file );
135 read_len = sector_count * 2048;
136 file_offset += 8; /* skip the subheader */
137 while( sector_count > 0 ) {
138 fseek( disc->file, file_offset, SEEK_SET );
139 fread( buf, 2048, 1, disc->file );
140 file_offset += track->sector_size;
146 return PKT_ERR_BADREADMODE;
150 return PKT_ERR_BADREADMODE;
157 uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count,
158 int mode, char *buf, uint32_t *length )
160 if( gdrom_disc == NULL )
161 return PKT_ERR_NODISC; /* No media */
162 return gdrom_disc->read_sectors( gdrom_disc, sector, sector_count, mode, buf, length );
166 void gdrom_dump_disc_info( gdrom_disc_t disc ) {
168 int last_session = disc->track[disc->track_count-1].session;
169 gboolean is_bootable = FALSE;
171 INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
172 disc->track[disc->track_count-1].session + 1 );
173 if( last_session > 0 ) {
174 /* Boot track is the first data track of the last session, provided that it
175 * cannot be a single-session disc.
178 for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
179 if( disc->track[i].flags & TRACK_DATA ) {
183 if( boot_track != -1 ) {
184 char boot_sector[2048];
185 uint32_t length = sizeof(boot_sector);
186 if( disc->read_sectors( disc, disc->track[boot_track].lba, 1, GDROM_MODE1,
187 boot_sector, &length ) == PKT_ERR_OK ) {
188 bootstrap_dump(boot_sector, FALSE);
194 WARN( "Disc does not appear to be bootable" );
197 gdrom_error_t gdrom_get_toc( char *buf )
199 struct gdrom_toc *toc = (struct gdrom_toc *)buf;
202 if( gdrom_disc == NULL )
203 return PKT_ERR_NODISC;
205 for( i=0; i<gdrom_disc->track_count; i++ ) {
206 toc->track[i] = htonl( gdrom_disc->track[i].lba ) | gdrom_disc->track[i].flags;
208 toc->first = 0x0100 | gdrom_disc->track[0].flags;
209 toc->last = (gdrom_disc->track_count<<8) | gdrom_disc->track[i-1].flags;
210 toc->leadout = htonl(gdrom_disc->track[i-1].lba + gdrom_disc->track[i-1].sector_count) |
211 gdrom_disc->track[i-1].flags;
213 toc->track[i] = 0xFFFFFFFF;
217 gdrom_error_t gdrom_get_info( char *buf, int session )
219 if( gdrom_disc == NULL )
220 return PKT_ERR_NODISC;
221 struct gdrom_track *last_track = &gdrom_disc->track[gdrom_disc->track_count-1];
222 unsigned int end_of_disc = last_track->lba + last_track->sector_count;
224 buf[0] = 0x01; /* Disc status? */
228 buf[2] = last_track->session+1; /* last session */
229 buf[3] = (end_of_disc >> 16) & 0xFF;
230 buf[4] = (end_of_disc >> 8) & 0xFF;
231 buf[5] = end_of_disc & 0xFF;
235 for( i=0; i<gdrom_disc->track_count; i++ ) {
236 if( gdrom_disc->track[i].session == session ) {
237 buf[2] = i+1; /* first track of session */
238 buf[3] = (gdrom_disc->track[i].lba >> 16) & 0xFF;
239 buf[4] = (gdrom_disc->track[i].lba >> 8) & 0xFF;
240 buf[5] = gdrom_disc->track[i].lba & 0xFF;
244 return PKT_ERR_BADFIELD; /* No such session */
249 void gdrom_mount_disc( gdrom_disc_t disc )
251 gdrom_unmount_disc();
253 idereg.disc = disc->disc_type | IDE_DISC_READY;
254 gdrom_dump_disc_info( disc );
257 gdrom_disc_t gdrom_mount_image( const gchar *filename )
259 gdrom_disc_t disc = gdrom_image_open(filename);
261 gdrom_mount_disc( disc );
265 void gdrom_unmount_disc( )
267 if( gdrom_disc != NULL ) {
268 gdrom_disc->close(gdrom_disc);
271 idereg.disc = IDE_DISC_NONE;
274 gboolean gdrom_is_mounted( void )
276 return gdrom_disc != NULL;
.