lxdream 0.9.1| filename | src/gdrom/gdrom.c |
| changeset | 167:71c0cc416a64 |
| prev | 158:a0a82246b44e |
| next | 168:203a72138e16 |
| author | nkeynes |
| date | Mon Jun 19 11:00:42 2006 +0000 (17 years ago) |
| permissions | -rw-r--r-- |
| last change | Add config value retrieval for pathnames Implement default path for disc + save state loaders Dump disc ID when mounting a CD |
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1 /**
2 * $Id: gdrom.c,v 1.8 2006-06-19 11:00:42 nkeynes Exp $
3 *
4 * GD-Rom access functions.
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 <stdio.h>
21 #include "gdrom/ide.h"
22 #include "gdrom/gdrom.h"
23 #include "gdrom/packet.h"
24 #include "dream.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 * );
30 gdrom_disc_t gdrom_disc = NULL;
32 char *gdrom_mode_names[] = { "Mode1", "Mode2", "XA 1", "XA2", "Audio", "GD-Rom" };
33 uint32_t gdrom_sector_size[] = { 2048, 2336, 2048, 2324, 2352, 2336 };
35 gdrom_disc_t gdrom_image_open( const gchar *filename )
36 {
37 return nrg_image_open( filename );
38 }
41 gdrom_disc_t gdrom_image_new( FILE *file )
42 {
43 struct gdrom_disc *disc = (struct gdrom_disc *)calloc(1, sizeof(struct gdrom_disc));
44 if( disc == NULL )
45 return NULL;
46 disc->read_sectors = gdrom_image_read_sectors;
47 disc->close = gdrom_image_destroy;
48 disc->disc_type = IDE_DISC_CDROM;
49 disc->file = file;
50 return disc;
51 }
53 static void gdrom_image_destroy( gdrom_disc_t disc )
54 {
55 if( disc->file != NULL ) {
56 fclose(disc->file);
57 disc->file = NULL;
58 }
59 free( disc );
60 }
62 static gdrom_error_t gdrom_image_read_sectors( gdrom_disc_t disc, uint32_t sector,
63 uint32_t sector_count, int mode, char *buf,
64 uint32_t *length )
65 {
66 int i, file_offset, read_len;
67 struct gdrom_track *track = NULL;
69 for( i=0; i<disc->track_count; i++ ) {
70 if( disc->track[i].lba <= sector &&
71 (sector + sector_count) <= (disc->track[i].lba + disc->track[i].sector_count) ) {
72 track = &disc->track[i];
73 break;
74 }
75 }
76 if( track == NULL )
77 return PKT_ERR_BADREAD;
79 file_offset = track->offset + track->sector_size * (sector - track->lba);
80 read_len = track->sector_size * sector_count;
82 switch( mode ) {
83 case GDROM_GD:
84 // Temporarily comment this out - it's wrong, but...
85 // if( track->mode != GDROM_GD )
86 // return PKT_ERR_BADREADMODE;
87 // break;
88 case GDROM_MODE1:
89 switch( track->mode ) {
90 case GDROM_MODE1:
91 case GDROM_MODE2_XA1:
92 fseek( disc->file, file_offset, SEEK_SET );
93 fread( buf, track->sector_size, sector_count, disc->file );
94 break;
95 case GDROM_MODE2:
96 read_len = sector_count * 2048;
97 file_offset += 8; /* skip the subheader */
98 while( sector_count > 0 ) {
99 fseek( disc->file, file_offset, SEEK_SET );
100 fread( buf, 2048, 1, disc->file );
101 file_offset += track->sector_size;
102 buf += 2048;
103 sector_count--;
104 }
105 break;
106 default:
107 return PKT_ERR_BADREADMODE;
108 }
109 break;
110 default:
111 return PKT_ERR_BADREADMODE;
112 }
114 *length = read_len;
115 return PKT_ERR_OK;
116 }
118 uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count,
119 int mode, char *buf, uint32_t *length )
120 {
121 if( gdrom_disc == NULL )
122 return PKT_ERR_NODISC; /* No media */
123 return gdrom_disc->read_sectors( gdrom_disc, sector, sector_count, mode, buf, length );
124 }
127 void gdrom_dump_disc_info( gdrom_disc_t disc ) {
128 int i;
129 int last_session = disc->track[disc->track_count-1].session;
130 gboolean is_bootable = FALSE;
132 INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
133 disc->track[disc->track_count-1].session + 1 );
134 if( last_session > 0 ) {
135 /* Boot track is the first data track of the last session, provided that it
136 * cannot be a single-session disc.
137 */
138 int boot_track = -1;
139 for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
140 if( disc->track[i].flags & TRACK_DATA ) {
141 boot_track = i;
142 }
143 }
144 if( boot_track != -1 ) {
145 char boot_sector[2048];
146 uint32_t length = sizeof(boot_sector);
147 if( disc->read_sectors( disc, disc->track[boot_track].lba, 1, GDROM_MODE1,
148 boot_sector, &length ) == PKT_ERR_OK ) {
149 bootstrap_dump(boot_sector, FALSE);
150 is_bootable = TRUE;
151 }
152 }
153 }
154 if( !is_bootable )
155 WARN( "Disc does not appear to be bootable" );
156 }
158 gdrom_error_t gdrom_get_toc( char *buf )
159 {
160 struct gdrom_toc *toc = (struct gdrom_toc *)buf;
161 int i;
163 if( gdrom_disc == NULL )
164 return PKT_ERR_NODISC;
166 for( i=0; i<gdrom_disc->track_count; i++ ) {
167 toc->track[i] = htonl( gdrom_disc->track[i].lba ) | gdrom_disc->track[i].flags;
168 }
169 toc->first = 0x0100 | gdrom_disc->track[0].flags;
170 toc->last = (gdrom_disc->track_count<<8) | gdrom_disc->track[i-1].flags;
171 toc->leadout = htonl(gdrom_disc->track[i-1].lba + gdrom_disc->track[i-1].sector_count) |
172 gdrom_disc->track[i-1].flags;
173 for( ;i<99; i++ )
174 toc->track[i] = 0xFFFFFFFF;
175 return PKT_ERR_OK;
176 }
178 gdrom_error_t gdrom_get_info( char *buf, int session )
179 {
180 if( gdrom_disc == NULL )
181 return PKT_ERR_NODISC;
182 struct gdrom_track *last_track = &gdrom_disc->track[gdrom_disc->track_count-1];
183 unsigned int end_of_disc = last_track->lba + last_track->sector_count;
184 int i;
185 buf[0] = 0x01; /* Disc status? */
186 buf[1] = 0;
188 if( session == 0 ) {
189 buf[2] = last_track->session+1; /* last session */
190 buf[3] = (end_of_disc >> 16) & 0xFF;
191 buf[4] = (end_of_disc >> 8) & 0xFF;
192 buf[5] = end_of_disc & 0xFF;
193 return PKT_ERR_OK;
194 } else {
195 session--;
196 for( i=0; i<gdrom_disc->track_count; i++ ) {
197 if( gdrom_disc->track[i].session == session ) {
198 buf[2] = i+1; /* first track of session */
199 buf[3] = (gdrom_disc->track[i].lba >> 16) & 0xFF;
200 buf[4] = (gdrom_disc->track[i].lba >> 8) & 0xFF;
201 buf[5] = gdrom_disc->track[i].lba & 0xFF;
202 return PKT_ERR_OK;
203 }
204 }
205 return PKT_ERR_BADFIELD; /* No such session */
206 }
208 }
210 void gdrom_mount_disc( gdrom_disc_t disc )
211 {
212 gdrom_unmount_disc();
213 gdrom_disc = disc;
214 idereg.disc = disc->disc_type | IDE_DISC_READY;
215 gdrom_dump_disc_info( disc );
216 }
218 gdrom_disc_t gdrom_mount_image( const gchar *filename )
219 {
220 gdrom_disc_t disc = gdrom_image_open(filename);
221 if( disc != NULL )
222 gdrom_mount_disc( disc );
223 return disc;
224 }
226 void gdrom_unmount_disc( )
227 {
228 if( gdrom_disc != NULL ) {
229 gdrom_disc->close(gdrom_disc);
230 }
231 gdrom_disc = NULL;
232 idereg.disc = IDE_DISC_NONE;
233 }
235 gboolean gdrom_is_mounted( void )
236 {
237 return gdrom_disc != NULL;
238 }
.