lxdream 0.9.1| filename | src/gdrom/gdrom.c |
| changeset | 152:d42a4c5cc709 |
| prev | 149:d88dd2e9a190 |
| next | 154:d62f7b49934b |
| author | nkeynes |
| date | Tue May 23 13:11:45 2006 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Clean up the buffer and i/o handling Implement save/load state |
| view | annotate | diff | log | raw |
1 /**
2 * $Id: gdrom.c,v 1.5 2006-05-23 13:11:45 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;
81 fseek( disc->file, file_offset, SEEK_SET );
83 switch( mode ) {
84 case GDROM_GD:
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 fread( buf, track->sector_size, sector_count, disc->file );
93 break;
94 case GDROM_MODE2:
95 read_len = sector_count * 2048;
96 while( sector_count > 0 ) {
97 fread( buf, 2048, 1, disc->file );
98 file_offset += track->sector_size;
99 buf += 2048;
100 fseek( disc->file, file_offset, SEEK_SET );
101 sector_count--;
102 }
103 break;
104 default:
105 return PKT_ERR_BADREADMODE;
106 }
107 break;
108 default:
109 return PKT_ERR_BADREADMODE;
110 }
112 *length = read_len;
113 return PKT_ERR_OK;
114 }
116 uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count,
117 int mode, char *buf, uint32_t *length )
118 {
119 if( gdrom_disc == NULL )
120 return PKT_ERR_NODISC; /* No media */
121 return gdrom_disc->read_sectors( gdrom_disc, sector, sector_count, mode, buf, length );
122 }
125 void gdrom_dump_disc( gdrom_disc_t disc ) {
126 int i;
127 INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
128 disc->track[disc->track_count-1].session + 1 );
129 for( i=0; i<disc->track_count; i++ ) {
130 INFO( "Sess %d Trk %d: Start %06X Length %06X, %s",
131 disc->track[i].session+1, i+1, disc->track[i].lba,
132 disc->track[i].sector_count, gdrom_mode_names[disc->track[i].mode] );
133 }
134 }
136 gdrom_error_t gdrom_get_toc( char *buf )
137 {
138 struct gdrom_toc *toc = (struct gdrom_toc *)buf;
139 int i;
141 if( gdrom_disc == NULL )
142 return PKT_ERR_NODISC;
144 for( i=0; i<gdrom_disc->track_count; i++ ) {
145 toc->track[i] = htonl( gdrom_disc->track[i].lba ) | gdrom_disc->track[i].flags;
146 }
147 toc->first = 0x0100 | gdrom_disc->track[0].flags;
148 toc->last = (gdrom_disc->track_count<<8) | gdrom_disc->track[i-1].flags;
149 toc->leadout = htonl(gdrom_disc->track[i-1].lba + gdrom_disc->track[i-1].sector_count) |
150 gdrom_disc->track[i-1].flags;
151 for( ;i<99; i++ )
152 toc->track[i] = 0xFFFFFFFF;
153 return PKT_ERR_OK;
154 }
156 gdrom_error_t gdrom_get_info( char *buf, int session )
157 {
158 if( gdrom_disc == NULL )
159 return PKT_ERR_NODISC;
160 struct gdrom_track *last_track = &gdrom_disc->track[gdrom_disc->track_count-1];
161 unsigned int end_of_disc = last_track->lba + last_track->sector_count;
162 int i;
163 buf[0] = 0x01; /* Disc status? */
164 buf[1] = 0;
166 if( session == 0 ) {
167 buf[2] = last_track->session+1; /* last session */
168 buf[3] = (end_of_disc >> 16) & 0xFF;
169 buf[4] = (end_of_disc >> 8) & 0xFF;
170 buf[5] = end_of_disc & 0xFF;
171 return PKT_ERR_OK;
172 } else {
173 session--;
174 for( i=0; i<gdrom_disc->track_count; i++ ) {
175 if( gdrom_disc->track[i].session == session ) {
176 buf[2] = i+1; /* first track of session */
177 buf[3] = (gdrom_disc->track[i].lba >> 16) & 0xFF;
178 buf[4] = (gdrom_disc->track[i].lba >> 8) & 0xFF;
179 buf[5] = gdrom_disc->track[i].lba & 0xFF;
180 return PKT_ERR_OK;
181 }
182 }
183 return PKT_ERR_BADFIELD; /* No such session */
184 }
186 }
188 void gdrom_mount_disc( gdrom_disc_t disc )
189 {
190 gdrom_unmount_disc();
191 gdrom_disc = disc;
192 idereg.disc = disc->disc_type | IDE_DISC_READY;
193 gdrom_dump_disc( disc );
194 }
196 gdrom_disc_t gdrom_mount_image( const gchar *filename )
197 {
198 gdrom_disc_t disc = gdrom_image_open(filename);
199 if( disc != NULL )
200 gdrom_mount_disc( disc );
201 return disc;
202 }
204 void gdrom_unmount_disc( )
205 {
206 if( gdrom_disc != NULL ) {
207 gdrom_disc->close(gdrom_disc);
208 }
209 gdrom_disc = NULL;
210 idereg.disc = IDE_DISC_NONE;
211 }
213 gboolean gdrom_is_mounted( void )
214 {
215 return gdrom_disc != NULL;
216 }
.