filename | src/gdrom/gdrom.c |
changeset | 245:a1d0655a88d3 |
prev | 237:6f1a429c9d12 |
next | 342:850502f0e8de |
author | nkeynes |
date | Fri Dec 29 00:24:43 2006 +0000 (17 years ago) |
permissions | -rw-r--r-- |
last change | Limit number of sectors read at once (linux driver seems to throw a hissy fit if you request too many at a time) |
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1 /**
2 * $Id: gdrom.c,v 1.11 2006-12-19 09:52:56 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>
20 #include <fcntl.h>
21 #include <errno.h>
22 #include "gdrom/ide.h"
23 #include "gdrom/gdrom.h"
24 #include "gdrom/packet.h"
25 #include "dream.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 )
38 {
39 const gchar *ext = strrchr(filename, '.');
40 gdrom_disc_t disc = NULL;
42 int fd = open( filename, O_RDONLY | O_NONBLOCK );
43 FILE *f;
44 int i,j;
45 gdrom_image_class_t extclz = NULL;
47 if( fd == -1 ) {
48 ERROR("Unable to open file '%s': %s", filename, strerror(errno));
49 return NULL;
50 }
52 f = fdopen(fd, "ro");
55 /* try extensions */
56 if( ext != NULL ) {
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);
64 if( disc != NULL )
65 return disc;
66 }
67 break;
68 }
69 }
70 }
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) ) {
77 recognized = TRUE;
78 disc = gdrom_image_classes[i]->open_image_file(filename, f);
79 if( disc != NULL )
80 return disc;
81 }
82 }
84 if( !recognized ) {
85 ERROR( "Unable to open disc %s: Unsupported format", filename );
86 }
87 fclose(f);
88 return NULL;
89 }
92 gdrom_disc_t gdrom_image_new( FILE *file )
93 {
94 struct gdrom_disc *disc = (struct gdrom_disc *)calloc(1, sizeof(struct gdrom_disc));
95 if( disc == NULL )
96 return NULL;
97 disc->read_sectors = gdrom_image_read_sectors;
98 disc->close = gdrom_image_destroy;
99 disc->disc_type = IDE_DISC_CDROM;
100 disc->file = file;
101 return disc;
102 }
104 static void gdrom_image_destroy( gdrom_disc_t disc )
105 {
106 if( disc->file != NULL ) {
107 fclose(disc->file);
108 disc->file = NULL;
109 }
110 free( disc );
111 }
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,
115 uint32_t *length )
116 {
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];
124 break;
125 }
126 }
127 if( track == NULL )
128 return PKT_ERR_BADREAD;
130 file_offset = track->offset + track->sector_size * (sector - track->lba);
131 read_len = track->sector_size * sector_count;
133 switch( mode ) {
134 case GDROM_GD:
135 // Temporarily comment this out - it's wrong, but...
136 // if( track->mode != GDROM_GD )
137 // return PKT_ERR_BADREADMODE;
138 // break;
139 case GDROM_MODE1:
140 case GDROM_MODE2_XA1:
141 switch( track->mode ) {
142 case GDROM_MODE1:
143 case GDROM_MODE2_XA1:
144 fseek( disc->file, file_offset, SEEK_SET );
145 fread( buf, track->sector_size, sector_count, disc->file );
146 break;
147 case GDROM_MODE2:
148 read_len = sector_count * 2048;
149 file_offset += 8; /* skip the subheader */
150 while( sector_count > 0 ) {
151 fseek( disc->file, file_offset, SEEK_SET );
152 fread( buf, 2048, 1, disc->file );
153 file_offset += track->sector_size;
154 buf += 2048;
155 sector_count--;
156 }
157 break;
158 default:
159 return PKT_ERR_BADREADMODE;
160 }
161 break;
162 default:
163 return PKT_ERR_BADREADMODE;
164 }
166 *length = read_len;
167 return PKT_ERR_OK;
168 }
170 uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count,
171 int mode, char *buf, uint32_t *length )
172 {
173 if( gdrom_disc == NULL )
174 return PKT_ERR_NODISC; /* No media */
175 return gdrom_disc->read_sectors( gdrom_disc, sector, sector_count, mode, buf, length );
176 }
179 void gdrom_dump_disc_info( gdrom_disc_t disc ) {
180 int i;
181 int last_session = disc->track[disc->track_count-1].session;
182 gboolean is_bootable = FALSE;
184 INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
185 disc->track[disc->track_count-1].session + 1 );
186 if( last_session > 0 ) {
187 /* Boot track is the first data track of the last session, provided that it
188 * cannot be a single-session disc.
189 */
190 int boot_track = -1;
191 for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
192 if( disc->track[i].flags & TRACK_DATA ) {
193 boot_track = i;
194 }
195 }
196 if( boot_track != -1 ) {
197 char boot_sector[2048];
198 uint32_t length = sizeof(boot_sector);
199 if( disc->read_sectors( disc, disc->track[boot_track].lba, 1, GDROM_MODE1,
200 boot_sector, &length ) == PKT_ERR_OK ) {
201 bootstrap_dump(boot_sector, FALSE);
202 is_bootable = TRUE;
203 }
204 }
205 }
206 if( !is_bootable )
207 WARN( "Disc does not appear to be bootable" );
208 }
210 gdrom_error_t gdrom_get_toc( char *buf )
211 {
212 struct gdrom_toc *toc = (struct gdrom_toc *)buf;
213 int i;
215 if( gdrom_disc == NULL )
216 return PKT_ERR_NODISC;
218 for( i=0; i<gdrom_disc->track_count; i++ ) {
219 toc->track[i] = htonl( gdrom_disc->track[i].lba ) | gdrom_disc->track[i].flags;
220 }
221 toc->first = 0x0100 | gdrom_disc->track[0].flags;
222 toc->last = (gdrom_disc->track_count<<8) | gdrom_disc->track[i-1].flags;
223 toc->leadout = htonl(gdrom_disc->track[i-1].lba + gdrom_disc->track[i-1].sector_count) |
224 gdrom_disc->track[i-1].flags;
225 for( ;i<99; i++ )
226 toc->track[i] = 0xFFFFFFFF;
227 return PKT_ERR_OK;
228 }
230 gdrom_error_t gdrom_get_info( char *buf, int session )
231 {
232 if( gdrom_disc == NULL )
233 return PKT_ERR_NODISC;
234 struct gdrom_track *last_track = &gdrom_disc->track[gdrom_disc->track_count-1];
235 unsigned int end_of_disc = last_track->lba + last_track->sector_count;
236 int i;
237 buf[0] = 0x01; /* Disc status? */
238 buf[1] = 0;
240 if( session == 0 ) {
241 buf[2] = last_track->session+1; /* last session */
242 buf[3] = (end_of_disc >> 16) & 0xFF;
243 buf[4] = (end_of_disc >> 8) & 0xFF;
244 buf[5] = end_of_disc & 0xFF;
245 return PKT_ERR_OK;
246 } else {
247 session--;
248 for( i=0; i<gdrom_disc->track_count; i++ ) {
249 if( gdrom_disc->track[i].session == session ) {
250 buf[2] = i+1; /* first track of session */
251 buf[3] = (gdrom_disc->track[i].lba >> 16) & 0xFF;
252 buf[4] = (gdrom_disc->track[i].lba >> 8) & 0xFF;
253 buf[5] = gdrom_disc->track[i].lba & 0xFF;
254 return PKT_ERR_OK;
255 }
256 }
257 return PKT_ERR_BADFIELD; /* No such session */
258 }
260 }
262 gdrom_track_t gdrom_get_track( int trackno ) {
263 if( gdrom_disc == NULL || trackno < 1 || trackno > 99 ) {
264 return NULL;
265 } else {
266 return &gdrom_disc->track[trackno-1];
267 }
268 }
270 uint8_t gdrom_get_track_no_by_lba( uint32_t lba ) {
271 int i;
272 if( gdrom_disc != NULL ) {
273 for( i=0; i<gdrom_disc->track_count; i++ ) {
274 if( gdrom_disc->track[i].lba <= lba &&
275 lba <= (gdrom_disc->track[i].lba + gdrom_disc->track[i].sector_count) ) {
276 return i+1;
277 }
278 }
279 }
280 return -1;
281 }
283 void gdrom_mount_disc( gdrom_disc_t disc )
284 {
285 gdrom_unmount_disc();
286 gdrom_disc = disc;
287 idereg.disc = disc->disc_type | IDE_DISC_READY;
288 gdrom_dump_disc_info( disc );
289 }
291 gdrom_disc_t gdrom_mount_image( const gchar *filename )
292 {
293 gdrom_disc_t disc = gdrom_image_open(filename);
294 if( disc != NULL )
295 gdrom_mount_disc( disc );
296 return disc;
297 }
299 void gdrom_unmount_disc( )
300 {
301 if( gdrom_disc != NULL ) {
302 gdrom_disc->close(gdrom_disc);
303 }
304 gdrom_disc = NULL;
305 idereg.disc = IDE_DISC_NONE;
306 }
308 gboolean gdrom_is_mounted( void )
309 {
310 return gdrom_disc != NULL;
311 }
.