lxdream 0.9.1| filename | src/gdrom/nrg.c |
| changeset | 468:3a49695e081a |
| prev | 464:8e099fad42a6 |
| next | 514:97f7e4bb2b54 |
| author | nkeynes |
| date | Sun Oct 28 07:23:46 2007 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Fix CDI with multiple tracks/session Fix file being closed too early |
| view | annotate | diff | log | raw |
1 /**
2 * $Id: nrg.c,v 1.7 2007-10-28 07:23:46 nkeynes Exp $
3 *
4 * Nero (NRG) CD file format. File information stolen shamelessly from
5 * libcdio.
6 *
7 * Copyright (c) 2005 Nathan Keynes.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
20 #include <assert.h>
21 #include <stdio.h>
22 #include <errno.h>
23 #include <netinet/in.h>
24 #include "gdrom/gdrom.h"
25 #include "dream.h"
27 static gboolean nrg_image_is_valid( FILE *f );
28 static gdrom_disc_t nrg_image_open( const gchar *filename, FILE *f );
30 struct gdrom_image_class nrg_image_class = { "Nero", "nrg",
31 nrg_image_is_valid, nrg_image_open };
33 #define NERO_V55_ID 0x4e455235
34 #define NERO_V50_ID 0x4e45524f
36 /* Courtesy of libcdio */
37 /* 5.0 or earlier */
38 #define NERO_ID 0x4e45524f /* Nero pre 5.5.x */
39 #define CUES_ID 0x43554553 /* Nero pre version 5.5.x-6.x */
40 #define DAOI_ID 0x44414f49
41 #define ETNF_ID 0x45544e46
42 #define SINF_ID 0x53494e46 /* Session information */
43 #define END_ID 0x454e4421
44 /* 5.5+ only */
45 #define NER5_ID 0x4e455235 /* Nero version 5.5.x */
46 #define CDTX_ID 0x43445458 /* CD TEXT */
47 #define CUEX_ID 0x43554558 /* Nero version 5.5.x-6.x */
48 #define DAOX_ID 0x44414f58 /* Nero version 5.5.x-6.x */
49 #define ETN2_ID 0x45544e32
50 #define MTYP_ID 0x4d545950 /* Disc Media type? */
53 union nrg_footer {
54 struct nrg_footer_v50 {
55 uint32_t dummy;
56 uint32_t id;
57 uint32_t offset;
58 } v50;
59 struct nrg_footer_v55 {
60 uint32_t id;
61 uint64_t offset;
62 } v55;
63 };
65 struct nrg_chunk {
66 uint32_t id;
67 uint32_t length;
68 };
70 struct nrg_etnf {
71 uint32_t offset;
72 uint32_t length;
73 uint32_t mode;
74 uint32_t lba;
75 uint32_t padding;
76 };
78 struct nrg_cues {
79 uint8_t type;
80 uint8_t track;
81 uint8_t control;
82 uint8_t pad;
83 uint32_t addr;
84 };
86 struct nrg_daoi {
87 uint32_t length;
88 char mcn[14];
89 uint8_t disc_mode;
90 uint8_t unknown[2]; /* always 01 01? */
91 uint8_t track_count;
92 struct nrg_daoi_track {
93 char unknown[10];
94 uint32_t sector_size __attribute__((packed)); /* Always 0? */
95 uint8_t mode;
96 uint8_t unknown2[3]; /* Always 00 00 01? */
97 uint32_t pregap __attribute__((packed));
98 uint32_t offset __attribute__((packed));
99 uint32_t end __attribute__((packed));
100 } track[0];
101 } __attribute__((packed));
103 /**
104 * Convert an 8-bit BCD number to normal integer form.
105 * Eg, 0x79 => 79
106 */
107 uint8_t static bcd_to_uint8( uint8_t bcd )
108 {
109 return (bcd & 0x0F) + (((bcd & 0xF0)>>4)*10);
110 }
113 /**
114 * Convert a 32 bit MSF address (BCD coded) to the
115 * equivalent LBA form.
116 * Eg, 0x
117 */
118 uint32_t static msf_to_lba( uint32_t msf )
119 {
120 msf = ntohl(msf);
121 int f = bcd_to_uint8(msf);
122 int s = bcd_to_uint8(msf>>8);
123 int m = bcd_to_uint8(msf>>16);
124 return (m * 60 + s) * 75 + f;
126 }
128 uint32_t static nrg_track_mode( uint8_t mode )
129 {
130 switch( mode ) {
131 case 0: return GDROM_MODE1;
132 case 2: return GDROM_MODE2_XA1;
133 case 3: return GDROM_MODE2;
134 case 7: return GDROM_CDDA;
135 default:
136 ERROR( "Unrecognized track mode %d in Nero image", mode );
137 return -1;
138 }
139 }
141 static gboolean nrg_image_is_valid( FILE *f )
142 {
143 union nrg_footer footer;
145 fseek( f, -12, SEEK_END );
146 fread( &footer, sizeof(footer), 1, f );
147 if( ntohl(footer.v50.id) == NERO_V50_ID ) {
148 return TRUE;
149 } else {
150 return FALSE;
151 }
152 }
154 static gdrom_disc_t nrg_image_open( const gchar *filename, FILE *f )
155 {
156 union nrg_footer footer;
157 struct nrg_chunk chunk;
158 struct nrg_daoi *dao;
159 gdrom_disc_t disc;
160 gdrom_image_t image;
161 gboolean end = FALSE;
162 int session_id = 0;
163 int session_track_id = 0;
164 int track_id = 0;
165 int cue_track_id = 0, cue_track_count = 0;
166 int i;
168 fseek( f, -12, SEEK_END );
169 fread( &footer, sizeof(footer), 1, f );
170 if( ntohl(footer.v50.id) == NERO_V50_ID ) {
171 INFO( "Loading Nero 5.0 image" );
172 fseek( f, ntohl(footer.v50.offset), SEEK_SET );
173 } else if( ntohl(footer.v55.id) == NERO_V55_ID ) {
174 INFO( "Loading Nero 5.5+ image" );
175 fseek( f, ntohl(footer.v55.offset), SEEK_SET );
176 } else {
177 /* Not a (recognized) Nero image */
178 return NULL;
179 }
181 disc = gdrom_image_new(filename, f);
182 if( disc == NULL ) {
183 ERROR("Unable to allocate memory!");
184 return NULL;
185 }
186 image = (gdrom_image_t)disc;
188 do {
189 fread( &chunk, sizeof(chunk), 1, f );
190 chunk.length = ntohl(chunk.length);
191 char data[chunk.length];
192 fread( data, chunk.length, 1, f );
193 switch( ntohl(chunk.id) ) {
194 case CUES_ID:
195 cue_track_id = track_id;
196 cue_track_count = ((chunk.length / sizeof(struct nrg_cues)) >> 1) - 1;
197 track_id += cue_track_count;
198 for( i=0; i<chunk.length; i+= sizeof(struct nrg_cues) ) {
199 struct nrg_cues *cue = (struct nrg_cues *)(data+i);
200 int track = 0;
201 if( cue->track == 0 )
202 continue; /* Track 0. Leadin? always 0? */
203 if( cue->track == 0xAA ) { /* end of disc */
204 image->track[track_id-1].sector_count =
205 msf_to_lba( cue->addr ) - image->track[track_id-1].lba;
206 } else {
207 track = cue_track_id + bcd_to_uint8(cue->track) - 1;
208 if( (cue->control & 0x01) == 0 ) {
209 /* Pre-gap address. */
210 if( track != 0 ) {
211 image->track[track-1].sector_count =
212 msf_to_lba( cue->addr ) - image->track[track-1].lba;
213 }
214 } else { /* Track-start address */
215 image->track[track].lba = msf_to_lba( cue->addr );
216 image->track[track].flags = cue->type;
217 }
218 }
219 }
220 break;
221 case DAOI_ID:
222 dao = (struct nrg_daoi *)data;
223 memcpy( image->mcn, dao->mcn, 13 );
224 image->mcn[13] = '\0';
225 assert( dao->track_count * 30 + 22 == chunk.length );
226 assert( dao->track_count == cue_track_count );
227 for( i=0; i<dao->track_count; i++ ) {
228 image->track[cue_track_id].sector_size = ntohl(dao->track[i].sector_size);
229 image->track[cue_track_id].offset = ntohl(dao->track[i].offset);
230 image->track[cue_track_id].mode = nrg_track_mode( dao->track[i].mode );
231 image->track[cue_track_id].sector_count =
232 (ntohl(dao->track[i].end) - ntohl(dao->track[i].offset))/
233 ntohl(dao->track[i].sector_size);
234 cue_track_id++;
235 }
236 break;
237 case SINF_ID:
238 /* Data is a single 32-bit number representing number of tracks in session */
239 i = ntohl( *(uint32_t *)data );
240 while( i-- > 0 )
241 image->track[session_track_id++].session = session_id;
242 session_id++;
243 break;
244 case ETNF_ID:
245 for( i=0; i < chunk.length; i+= 0x14 ) {
246 struct nrg_etnf *etnf = (struct nrg_etnf *)(data+i);
247 image->track[track_id].offset = ntohl(etnf->offset);
248 image->track[track_id].lba = ntohl(etnf->lba) + (i+1)*GDROM_PREGAP;
249 image->track[track_id].mode = nrg_track_mode( ntohl(etnf->mode) );
250 if( image->track[track_id].mode == -1 ) {
251 gdrom_image_destroy_no_close(disc);
252 return NULL;
253 }
254 if( image->track[track_id].mode == GDROM_CDDA )
255 image->track[track_id].flags = 0x01;
256 else
257 image->track[track_id].flags = 0x01 | TRACK_DATA;
258 image->track[track_id].sector_size = GDROM_SECTOR_SIZE(image->track[track_id].mode);
259 image->track[track_id].sector_count = ntohl(etnf->length) /
260 image->track[track_id].sector_size;
261 track_id++;
262 }
263 break;
264 case END_ID:
265 end = TRUE;
266 break;
267 }
268 } while( !end );
269 image->track_count = track_id;
270 return disc;
271 }
.