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lxdream.org :: lxdream/src/gdrom/nrg.c
lxdream 0.9.1
released Jun 29
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filename src/gdrom/nrg.c
changeset 561:533f6b478071
prev514:97f7e4bb2b54
next644:ccae4bfa5f82
author nkeynes
date Tue Jan 01 05:08:38 2008 +0000 (12 years ago)
branchlxdream-mmu
permissions -rw-r--r--
last change Enable Id keyword on all source files
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     1 /**
     2  * $Id$
     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 <glib/gtypes.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_etn2 {
    79     uint64_t offset;
    80     uint64_t length;
    81     uint32_t mode;
    82     uint32_t lba;
    83     uint64_t padding;
    84 };
    86 struct nrg_cues {
    87     uint8_t type;
    88     uint8_t track;
    89     uint8_t control;
    90     uint8_t pad;
    91     uint32_t addr;
    92 };
    94 struct nrg_daoi {
    95     uint32_t length;
    96     char mcn[14];
    97     uint8_t disc_mode;
    98     uint8_t unknown[2]; /* always 01 01? */
    99     uint8_t track_count;
   100     struct nrg_daoi_track {
   101 	char unknown[10];
   102 	uint32_t sector_size __attribute__((packed)); /* Always 0? */
   103 	uint8_t mode;
   104 	uint8_t unknown2[3]; /* Always 00 00 01? */
   105 	uint32_t pregap __attribute__((packed));
   106 	uint32_t offset __attribute__((packed));
   107 	uint32_t end __attribute__((packed));
   108     } track[0];
   109 } __attribute__((packed));
   111 struct nrg_daox {
   112     uint32_t length;
   113     char mcn[14];
   114     uint8_t disc_mode;
   115     uint8_t unknown[2]; /* always 01 01? */
   116     uint8_t track_count;
   117     struct nrg_daox_track {
   118 	char unknown[10];
   119 	uint32_t sector_size __attribute__((packed)); /* Always 0? */
   120 	uint8_t mode;
   121 	uint8_t unknown2[3]; /* Always 00 00 01? */
   122 	uint64_t pregap __attribute__((packed));
   123 	uint64_t offset __attribute__((packed));
   124 	uint64_t end __attribute__((packed));
   125     } track[0];
   126 } __attribute__((packed));
   128 /**
   129  * Convert an 8-bit BCD number to normal integer form. 
   130  * Eg, 0x79 => 79
   131  */
   132 uint8_t static bcd_to_uint8( uint8_t bcd )
   133 {
   134     return (bcd & 0x0F) + (((bcd & 0xF0)>>4)*10);
   135 }
   138 /**
   139  * Convert a 32 bit MSF address (BCD coded) to the
   140  * equivalent LBA form. 
   141  * Eg, 0x
   142  */
   143 uint32_t static msf_to_lba( uint32_t msf )
   144 {
   145     msf = GUINT32_FROM_BE(msf);
   146     int f = bcd_to_uint8(msf);
   147     int s = bcd_to_uint8(msf>>8);
   148     int m = bcd_to_uint8(msf>>16);
   149     return (m * 60 + s) * 75 + f;
   151 }
   153 uint32_t static nrg_track_mode( uint8_t mode )
   154 {
   155     switch( mode ) {
   156     case 0: return GDROM_MODE1;
   157     case 2: return GDROM_MODE2_XA1;
   158     case 3: return GDROM_MODE2;
   159     case 7: return GDROM_CDDA;
   160     default: 
   161 	ERROR( "Unrecognized track mode %d in Nero image", mode );
   162 	return -1;
   163     }
   164 }
   166 static gboolean nrg_image_is_valid( FILE *f )
   167 {
   168     union nrg_footer footer;
   170     fseek( f, -12, SEEK_END );
   171     fread( &footer, sizeof(footer), 1, f );
   172     if( GUINT32_FROM_BE(footer.v50.id) == NERO_V50_ID ||
   173 	GUINT32_FROM_BE(footer.v55.id) == NERO_V55_ID ) {
   174 	return TRUE;
   175     } else {
   176 	return FALSE;
   177     }
   178 }
   180 static gdrom_disc_t nrg_image_open( const gchar *filename, FILE *f )
   181 {
   182     union nrg_footer footer;
   183     struct nrg_chunk chunk;
   184     struct nrg_daoi *dao;
   185     struct nrg_daox *daox;
   186     struct nrg_etnf *etnf;
   187     struct nrg_etn2 *etn2;
   188     gdrom_disc_t disc;
   189     gdrom_image_t image;
   190     gboolean end = FALSE;
   191     uint32_t chunk_id;
   192     int session_id = 0;
   193     int session_track_id = 0;
   194     int track_id = 0;
   195     int cue_track_id = 0, cue_track_count = 0;
   196     int i, count;
   198     fseek( f, -12, SEEK_END );
   199     fread( &footer, sizeof(footer), 1, f );
   200     if( GUINT32_FROM_BE(footer.v50.id) == NERO_V50_ID ) {
   201 	INFO( "Loading Nero 5.0 image" );
   202 	fseek( f, GUINT32_FROM_BE(footer.v50.offset), SEEK_SET );
   203     } else if( GUINT32_FROM_BE(footer.v55.id) == NERO_V55_ID ) {
   204 	INFO( "Loading Nero 5.5+ image" );
   205 	fseek( f, (uint32_t)GUINT64_FROM_BE(footer.v55.offset), SEEK_SET );
   206     } else {
   207 	/* Not a (recognized) Nero image */
   208 	return NULL;
   209     }
   211     disc = gdrom_image_new(filename, f);
   212     if( disc == NULL ) {
   213 	ERROR("Unable to allocate memory!");
   214 	return NULL;
   215     }
   216     image = (gdrom_image_t)disc;
   218     do {
   219 	fread( &chunk, sizeof(chunk), 1, f );
   220 	chunk.length = GUINT32_FROM_BE(chunk.length);
   221 	char data[chunk.length];
   222 	fread( data, chunk.length, 1, f );
   223 	chunk_id = GUINT32_FROM_BE(chunk.id);
   224 	switch( chunk_id ) {
   225 	case CUES_ID:
   226 	case CUEX_ID:
   227 	    cue_track_id = track_id;
   228 	    cue_track_count = ((chunk.length / sizeof(struct nrg_cues)) >> 1) - 1;
   229 	    track_id += cue_track_count;
   230 	    for( i=0; i<chunk.length; i+= sizeof(struct nrg_cues) ) {
   231 		struct nrg_cues *cue = (struct nrg_cues *)(data+i);
   232 		int track = 0;
   233 		uint32_t lba;
   234 		if( chunk_id == CUEX_ID ) {
   235 		    lba = GUINT32_FROM_BE( cue->addr ) + GDROM_PREGAP;
   236 		} else {
   237 		    lba = msf_to_lba( cue->addr );
   238 		}
   239 		if( cue->track == 0 )
   240 		    continue; /* Track 0. Leadin? always 0? */
   241 		if( cue->track == 0xAA ) { /* end of disc */
   242 		    image->track[track_id-1].sector_count =
   243 			lba - image->track[track_id-1].lba;
   244 		} else {
   245 		    track = cue_track_id + bcd_to_uint8(cue->track) - 1;
   246 		    if( (cue->control & 0x01) == 0 ) { 
   247 			/* Pre-gap address. */
   248 			if( track != 0 ) {
   249 			    image->track[track-1].sector_count = 
   250 				lba - image->track[track-1].lba;
   251 			}
   252 		    } else { /* Track-start address */
   253 			image->track[track].lba = lba;
   254 			image->track[track].flags = cue->type;
   255 		    }
   256 		}
   257 	    }
   258 	    break;
   259 	case DAOI_ID:
   260 	    dao = (struct nrg_daoi *)data;
   261 	    memcpy( image->mcn, dao->mcn, 13 );
   262 	    image->mcn[13] = '\0';
   263 	    assert( dao->track_count * 30 + 22 == chunk.length );
   264 	    assert( dao->track_count == cue_track_count );
   265 	    for( i=0; i<dao->track_count; i++ ) {
   266 		image->track[cue_track_id].sector_size = GUINT32_FROM_BE(dao->track[i].sector_size);
   267 		image->track[cue_track_id].offset = GUINT32_FROM_BE(dao->track[i].offset);
   268 		image->track[cue_track_id].mode = nrg_track_mode( dao->track[i].mode );
   269 		image->track[cue_track_id].sector_count =
   270 		    (GUINT32_FROM_BE(dao->track[i].end) - GUINT32_FROM_BE(dao->track[i].offset))/
   271 		    GUINT32_FROM_BE(dao->track[i].sector_size);
   272 		cue_track_id++;
   273 	    }
   274 	    break;
   275 	case DAOX_ID:
   276 	    daox = (struct nrg_daox *)data;
   277 	    memcpy( image->mcn, daox->mcn, 13 );
   278 	    image->mcn[13] = '\0';
   279 	    assert( daox->track_count * 42 + 22 == chunk.length );
   280 	    assert( daox->track_count == cue_track_count );
   281 	    for( i=0; i<daox->track_count; i++ ) {
   282 		image->track[cue_track_id].sector_size = GUINT32_FROM_BE(daox->track[i].sector_size);
   283 		image->track[cue_track_id].offset = GUINT64_FROM_BE(daox->track[i].offset);
   284 		image->track[cue_track_id].mode = nrg_track_mode( daox->track[i].mode );
   285 		image->track[cue_track_id].sector_count =
   286 		    (GUINT64_FROM_BE(daox->track[i].end) - GUINT64_FROM_BE(daox->track[i].offset))/
   287 		    GUINT32_FROM_BE(daox->track[i].sector_size);
   288 		cue_track_id++;
   289 	    }
   290 	    break;
   292 	case SINF_ID: 
   293 	    /* Data is a single 32-bit number representing number of tracks in session */
   294 	    i = GUINT32_FROM_BE( *(uint32_t *)data );
   295 	    while( i-- > 0 )
   296 		image->track[session_track_id++].session = session_id;
   297 	    session_id++;
   298 	    break;
   299 	case ETNF_ID:
   300 	    etnf = (struct nrg_etnf *)data;
   301 	    count = chunk.length / sizeof(struct nrg_etnf);
   302 	    for( i=0; i < count; i++, etnf++ ) {
   303 		image->track[track_id].offset = GUINT32_FROM_BE(etnf->offset);
   304 		image->track[track_id].lba = GUINT32_FROM_BE(etnf->lba) + (i+1)*GDROM_PREGAP;
   305 		image->track[track_id].mode = nrg_track_mode( GUINT32_FROM_BE(etnf->mode) );
   306 		if( image->track[track_id].mode == -1 ) {
   307 		    gdrom_image_destroy_no_close(disc);
   308 		    return NULL;
   309 		}
   310 		if( image->track[track_id].mode == GDROM_CDDA )
   311 		    image->track[track_id].flags = 0x01;
   312 		else
   313 		    image->track[track_id].flags = 0x01 | TRACK_DATA;
   314 		image->track[track_id].sector_size = GDROM_SECTOR_SIZE(image->track[track_id].mode);
   315 		image->track[track_id].sector_count = GUINT32_FROM_BE(etnf->length) / 
   316 		    image->track[track_id].sector_size;
   317 		track_id++;
   318 	    }
   319 	    break;
   320 	case ETN2_ID:
   321 	    etn2 = (struct nrg_etn2 *)data;
   322 	    count = chunk.length / sizeof(struct nrg_etn2);
   323 	    for( i=0; i < count; i++, etn2++ ) {
   324 		image->track[track_id].offset = (uint32_t)GUINT64_FROM_BE(etn2->offset);
   325 		image->track[track_id].lba = GUINT32_FROM_BE(etn2->lba) + (i+1)*GDROM_PREGAP;
   326 		image->track[track_id].mode = nrg_track_mode( GUINT32_FROM_BE(etn2->mode) );
   327 		if( image->track[track_id].mode == -1 ) {
   328 		    gdrom_image_destroy_no_close(disc);
   329 		    return NULL;
   330 		}
   331 		if( image->track[track_id].mode == GDROM_CDDA )
   332 		    image->track[track_id].flags = 0x01;
   333 		else
   334 		    image->track[track_id].flags = 0x01 | TRACK_DATA;
   335 		image->track[track_id].sector_size = GDROM_SECTOR_SIZE(image->track[track_id].mode);
   336 		image->track[track_id].sector_count = (uint32_t)(GUINT64_FROM_BE(etn2->length) / 
   337 								 image->track[track_id].sector_size);
   338 		track_id++;
   339 	    }
   340 	    break;
   342 	case END_ID:
   343 	    end = TRUE;
   344 	    break;
   345 	}
   346     } while( !end );
   347     image->track_count = track_id;
   348     return disc;
   349 }
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