filename | src/gdrom/nrg.c |
changeset | 142:2f631c3a3946 |
prev | 138:afabd7e6d26d |
next | 168:203a72138e16 |
author | nkeynes |
date | Wed May 03 12:52:38 2006 +0000 (17 years ago) |
permissions | -rw-r--r-- |
last change | Add (track) mode parameter to read sectors call Fix missing interrupt on end-of-packet read. |
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1 /**
2 * $Id: nrg.c,v 1.2 2006-05-02 14:09:11 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 "gdrom/gdrom.h"
24 #include "dream.h"
26 #define NERO_V55_ID 0x4e455235
27 #define NERO_V50_ID 0x4e45524f
29 /* Courtesy of libcdio */
30 /* 5.0 or earlier */
31 #define NERO_ID 0x4e45524f /* Nero pre 5.5.x */
32 #define CUES_ID 0x43554553 /* Nero pre version 5.5.x-6.x */
33 #define DAOI_ID 0x44414f49
34 #define ETNF_ID 0x45544e46
35 #define SINF_ID 0x53494e46 /* Session information */
36 #define END_ID 0x454e4421
37 /* 5.5+ only */
38 #define NER5_ID 0x4e455235 /* Nero version 5.5.x */
39 #define CDTX_ID 0x43445458 /* CD TEXT */
40 #define CUEX_ID 0x43554558 /* Nero version 5.5.x-6.x */
41 #define DAOX_ID 0x44414f58 /* Nero version 5.5.x-6.x */
42 #define ETN2_ID 0x45544e32
43 #define MTYP_ID 0x4d545950 /* Disc Media type? */
46 union nrg_footer {
47 struct nrg_footer_v50 {
48 uint32_t dummy;
49 uint32_t id;
50 uint32_t offset;
51 } v50;
52 struct nrg_footer_v55 {
53 uint32_t id;
54 uint64_t offset;
55 } v55;
56 };
58 struct nrg_chunk {
59 uint32_t id;
60 uint32_t length;
61 };
63 struct nrg_etnf {
64 uint32_t offset;
65 uint32_t length;
66 uint32_t mode;
67 uint32_t lba;
68 uint32_t padding;
69 };
71 struct nrg_cues {
72 uint8_t type;
73 uint8_t track;
74 uint8_t control;
75 uint8_t pad;
76 uint32_t addr;
77 };
79 struct nrg_daoi {
80 uint32_t length;
81 char mcn[14];
82 uint8_t disc_mode;
83 uint8_t unknown[2]; /* always 01 01? */
84 uint8_t track_count;
85 struct nrg_daoi_track {
86 char unknown[10];
87 uint32_t sector_size __attribute__((packed)); /* Always 0? */
88 uint8_t mode;
89 uint8_t unknown2[3]; /* Always 00 00 01? */
90 uint32_t pregap __attribute__((packed));
91 uint32_t offset __attribute__((packed));
92 uint32_t end __attribute__((packed));
93 } track[0];
94 } __attribute__((packed));
96 /**
97 * Convert an 8-bit BCD number to normal integer form.
98 * Eg, 0x79 => 79
99 */
100 uint8_t static bcd_to_uint8( uint8_t bcd )
101 {
102 return (bcd & 0x0F) + (((bcd & 0xF0)>>4)*10);
103 }
106 /**
107 * Convert a 32 bit MSF address (BCD coded) to the
108 * equivalent LBA form.
109 * Eg, 0x
110 */
111 uint32_t static msf_to_lba( uint32_t msf )
112 {
113 msf = ntohl(msf);
114 int f = bcd_to_uint8(msf);
115 int s = bcd_to_uint8(msf>>8);
116 int m = bcd_to_uint8(msf>>16);
117 return (m * 60 + s) * 75 + f;
119 }
121 uint32_t static nrg_track_mode( uint8_t mode )
122 {
123 switch( mode ) {
124 case 0: return GDROM_MODE1;
125 case 2: return GDROM_MODE2_XA1;
126 case 3: return GDROM_MODE2;
127 case 7: return GDROM_CDDA;
128 default:
129 ERROR( "Unrecognized track mode %d in Nero image", mode );
130 return -1;
131 }
132 }
134 gdrom_disc_t nrg_image_open( const gchar *filename )
135 {
136 FILE *f = fopen( filename, "ro" );
137 union nrg_footer footer;
138 struct nrg_chunk chunk;
139 struct nrg_daoi *dao;
140 gdrom_disc_t disc;
141 gboolean end = FALSE;
142 int session_id = 0;
143 int session_track_id = 0;
144 int track_id = 0;
145 int cue_track_id = 0, cue_track_count = 0;
146 int i;
148 if( f == NULL ) {
149 ERROR( "Unable to open file '%s': %s", filename, strerror(errno) );
150 return NULL;
151 }
153 fseek( f, -12, SEEK_END );
154 fread( &footer, sizeof(footer), 1, f );
155 if( ntohl(footer.v50.id) == NERO_V50_ID ) {
156 INFO( "Loading Nero 5.0 image" );
157 fseek( f, ntohl(footer.v50.offset), SEEK_SET );
158 } else if( ntohl(footer.v55.id) == NERO_V55_ID ) {
159 INFO( "Loading Nero 5.5+ image" );
160 fseek( f, ntohl(footer.v55.offset), SEEK_SET );
161 } else {
162 ERROR("Unable to understand file '%s' as a Nero image", filename );
163 return NULL;
164 }
166 disc = gdrom_image_new(f);
167 if( disc == NULL ) {
168 ERROR("Unable to allocate memory!");
169 fclose(f);
170 return NULL;
171 }
173 do {
174 fread( &chunk, sizeof(chunk), 1, f );
175 chunk.length = ntohl(chunk.length);
176 char data[chunk.length];
177 fread( data, chunk.length, 1, f );
178 switch( ntohl(chunk.id) ) {
179 case CUES_ID:
180 cue_track_id = track_id;
181 cue_track_count = ((chunk.length / sizeof(struct nrg_cues)) >> 1) - 1;
182 track_id += cue_track_count;
183 for( i=0; i<chunk.length; i+= sizeof(struct nrg_cues) ) {
184 struct nrg_cues *cue = (struct nrg_cues *)(data+i);
185 int track = 0;
186 if( cue->track == 0 )
187 continue; /* Track 0. Leadin? always 0? */
188 if( cue->track == 0xAA ) { /* end of disc */
189 disc->track[track_id-1].sector_count =
190 msf_to_lba( cue->addr ) - disc->track[track_id-1].lba;
191 } else {
192 track = cue_track_id + bcd_to_uint8(cue->track) - 1;
193 if( (cue->control & 0x01) == 0 ) {
194 /* Pre-gap address. */
195 if( track != 0 ) {
196 disc->track[track-1].sector_count =
197 msf_to_lba( cue->addr ) - disc->track[track-1].lba;
198 }
199 } else { /* Track-start address */
200 disc->track[track].lba = msf_to_lba( cue->addr );
201 disc->track[track].flags = cue->type;
202 }
203 }
204 }
205 break;
206 case DAOI_ID:
207 dao = (struct nrg_daoi *)data;
208 memcpy( disc->mcn, dao->mcn, 13 );
209 disc->mcn[13] = '\0';
210 assert( dao->track_count * 30 + 22 == chunk.length );
211 assert( dao->track_count == cue_track_count );
212 for( i=0; i<dao->track_count; i++ ) {
213 disc->track[cue_track_id].sector_size = ntohl(dao->track[i].sector_size);
214 disc->track[cue_track_id].offset = ntohl(dao->track[i].offset);
215 disc->track[cue_track_id].mode = nrg_track_mode( dao->track[i].mode );
216 assert( disc->track[cue_track_id].sector_count ==
217 (ntohl(dao->track[i].end) - ntohl(dao->track[i].offset))/
218 ntohl(dao->track[i].sector_size) );
219 cue_track_id++;
220 }
221 break;
222 case SINF_ID:
223 /* Data is a single 32-bit number representing number of tracks in session */
224 i = ntohl( *(uint32_t *)data );
225 while( i-- > 0 )
226 disc->track[session_track_id++].session = session_id;
227 session_id++;
228 break;
229 case ETNF_ID:
230 for( i=0; i < chunk.length; i+= 0x14 ) {
231 struct nrg_etnf *etnf = (struct nrg_etnf *)(data+i);
232 disc->track[track_id].offset = ntohl(etnf->offset);
233 disc->track[track_id].lba = ntohl(etnf->lba) + (i+1)*GDROM_PREGAP;
234 disc->track[track_id].mode = nrg_track_mode( ntohl(etnf->mode) );
235 if( disc->track[track_id].mode == -1 ) {
236 disc->close(disc);
237 return NULL;
238 }
239 if( disc->track[track_id].mode == GDROM_CDDA )
240 disc->track[track_id].flags = 0x01;
241 else
242 disc->track[track_id].flags = 0x01 | TRACK_DATA;
243 disc->track[track_id].sector_size = GDROM_SECTOR_SIZE(disc->track[track_id].mode);
244 disc->track[track_id].sector_count = ntohl(etnf->length) /
245 disc->track[track_id].sector_size;
246 track_id++;
247 }
248 break;
249 case END_ID:
250 end = TRUE;
251 break;
252 }
253 } while( !end );
254 disc->track_count = track_id;
255 return disc;
256 }
258 gboolean nrg_read_sectors( struct gdrom_disc *disc, uint32_t lba, uint32_t count, char *buf )
259 {
260 return FALSE;
261 }
.