filename | src/gdrom/gdimage.c |
changeset | 342:850502f0e8de |
next | 422:61a0598e07ff |
author | nkeynes |
date | Fri Sep 28 07:25:22 2007 +0000 (16 years ago) |
permissions | -rw-r--r-- |
last change | Remove MMU check (probably shouldn't be here anyway), and disable TRACE_IO checks by default |
view | annotate | diff | log | raw |
1 /**
2 * $Id: gdimage.c,v 1.1 2007-01-31 10:58:42 nkeynes Exp $
3 *
4 * GD-Rom image-file common 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 "gdrom/gdrom.h"
20 #include "gdrom/packet.h"
22 static void gdrom_image_destroy( gdrom_disc_t disc );
23 static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode,
24 char *buf, uint32_t *readlength );
25 static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, char *buf );
26 static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, char *buf );
27 static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, char *buf );
28 static int gdrom_image_drive_status( gdrom_disc_t disc );
31 /**
32 * Initialize a gdrom_disc structure with the gdrom_image_* methods
33 */
34 void gdrom_image_init( gdrom_disc_t disc )
35 {
36 memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
37 disc->read_sector = gdrom_image_read_sector;
38 disc->read_toc = gdrom_image_read_toc;
39 disc->read_session = gdrom_image_read_session;
40 disc->read_position = gdrom_image_read_position;
41 disc->drive_status = gdrom_image_drive_status;
42 disc->play_audio = NULL; /* not supported yet */
43 disc->run_time_slice = NULL; /* not needed */
44 disc->close = gdrom_image_destroy;
45 }
47 gdrom_disc_t gdrom_image_new( FILE *f )
48 {
49 gdrom_image_t image = (gdrom_image_t)calloc(sizeof(struct gdrom_image), 1);
50 if( image == NULL ) {
51 return NULL;
52 }
53 image->disc_type = IDE_DISC_CDROM;
54 image->file = f;
56 gdrom_disc_t disc = (gdrom_disc_t)image;
57 gdrom_image_init(disc);
58 return disc;
59 }
61 static void gdrom_image_destroy( gdrom_disc_t disc )
62 {
63 gdrom_image_t img = (gdrom_image_t)disc;
64 if( img->file != NULL ) {
65 fclose(img->file);
66 img->file = NULL;
67 }
68 free( disc );
69 }
71 static int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
72 {
73 int i;
74 for( i=0; i<image->track_count; i++ ) {
75 if( image->track[i].lba <= lba &&
76 lba < (image->track[i].lba + image->track[i].sector_count) ) {
77 return i+1;
78 }
79 }
80 return -1;
81 }
83 static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
84 int mode, char *buf, uint32_t *length )
85 {
86 gdrom_image_t image = (gdrom_image_t)disc;
87 int i, file_offset, read_len, track_no;
89 track_no = gdrom_image_get_track_by_lba( image, lba );
90 if( track_no == -1 ) {
91 return PKT_ERR_BADREAD;
92 }
93 struct gdrom_track *track = &image->track[track_no-1];
94 file_offset = track->offset + track->sector_size * (lba - track->lba);
95 read_len = track->sector_size;
97 switch( mode ) {
98 case 0x24:
99 case 0x28:
100 switch( track->mode ) {
101 case GDROM_MODE1:
102 case GDROM_MODE2_XA1:
103 fseek( image->file, file_offset, SEEK_SET );
104 fread( buf, track->sector_size, 1, image->file );
105 break;
106 case GDROM_MODE2:
107 read_len = 2048;
108 file_offset += 8; /* skip the subheader */
109 fseek( image->file, file_offset, SEEK_SET );
110 fread( buf, 2048, 1, image->file );
111 break;
112 default:
113 return PKT_ERR_BADREADMODE;
114 }
115 break;
116 default:
117 return PKT_ERR_BADREADMODE;
118 }
120 *length = read_len;
121 return PKT_ERR_OK;
123 }
125 static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, char *buf )
126 {
127 gdrom_image_t image = (gdrom_image_t)disc;
128 struct gdrom_toc *toc = (struct gdrom_toc *)buf;
129 int i;
131 for( i=0; i<image->track_count; i++ ) {
132 toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
133 }
134 toc->first = 0x0100 | image->track[0].flags;
135 toc->last = (image->track_count<<8) | image->track[i-1].flags;
136 toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
137 image->track[i-1].flags;
138 for( ;i<99; i++ )
139 toc->track[i] = 0xFFFFFFFF;
140 return PKT_ERR_OK;
141 }
143 static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, char *buf )
144 {
145 gdrom_image_t image = (gdrom_image_t)disc;
146 struct gdrom_track *last_track = &image->track[image->track_count-1];
147 unsigned int end_of_disc = last_track->lba + last_track->sector_count;
148 int i;
149 buf[0] = 0x01; /* Disc status? */
150 buf[1] = 0;
152 if( session == 0 ) {
153 buf[2] = last_track->session+1; /* last session */
154 buf[3] = (end_of_disc >> 16) & 0xFF;
155 buf[4] = (end_of_disc >> 8) & 0xFF;
156 buf[5] = end_of_disc & 0xFF;
157 return PKT_ERR_OK;
158 } else {
159 session--;
160 for( i=0; i<image->track_count; i++ ) {
161 if( image->track[i].session == session ) {
162 buf[2] = i+1; /* first track of session */
163 buf[3] = (image->track[i].lba >> 16) & 0xFF;
164 buf[4] = (image->track[i].lba >> 8) & 0xFF;
165 buf[5] = image->track[i].lba & 0xFF;
166 return PKT_ERR_OK;
167 }
168 }
169 return PKT_ERR_BADFIELD; /* No such session */
170 }
171 }
173 static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, char *buf )
174 {
175 gdrom_image_t image = (gdrom_image_t)disc;
176 int track_no = gdrom_image_get_track_by_lba( image, lba );
177 if( track_no == -1 ) {
178 track_no = 1;
179 lba = 150;
180 }
181 struct gdrom_track *track = &image->track[track_no-1];
182 uint32_t offset = lba - track->lba;
183 buf[4] = track->flags;
184 buf[5] = track_no;
185 buf[6] = 0x01; /* ?? */
186 buf[7] = (offset >> 16) & 0xFF;
187 buf[8] = (offset >> 8) & 0xFF;
188 buf[9] = offset & 0xFF;
189 buf[10] = 0;
190 buf[11] = (lba >> 16) & 0xFF;
191 buf[12] = (lba >> 8) & 0xFF;
192 buf[13] = lba & 0xFF;
193 }
195 static int gdrom_image_drive_status( gdrom_disc_t disc )
196 {
197 gdrom_image_t image = (gdrom_image_t)disc;
198 return image->disc_type | IDE_DISC_READY;
199 }
201 void gdrom_image_dump_info( gdrom_disc_t d ) {
202 gdrom_image_t disc = (gdrom_image_t)d;
203 int i;
204 int last_session = disc->track[disc->track_count-1].session;
205 gboolean is_bootable = FALSE;
207 INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
208 disc->track[disc->track_count-1].session + 1 );
209 if( last_session > 0 ) {
210 /* Boot track is the first data track of the last session, provided that it
211 * cannot be a single-session disc.
212 */
213 int boot_track = -1;
214 for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
215 if( disc->track[i].flags & TRACK_DATA ) {
216 boot_track = i;
217 }
218 }
219 if( boot_track != -1 ) {
220 char boot_sector[MAX_SECTOR_SIZE];
221 uint32_t length = sizeof(boot_sector);
222 if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
223 boot_sector, &length ) == PKT_ERR_OK ) {
224 bootstrap_dump(boot_sector, FALSE);
225 is_bootable = TRUE;
226 }
227 }
228 }
229 if( !is_bootable ) {
230 WARN( "Disc does not appear to be bootable" );
231 }
232 }
.