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lxdream.org :: lxdream/src/gdrom/cdi.c
lxdream 0.9.1
released Jun 29
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filename src/gdrom/cdi.c
changeset 422:61a0598e07ff
prev347:e686be8b10df
next453:20f9c11e69e5
author nkeynes
date Sat Oct 06 09:03:24 2007 +0000 (13 years ago)
permissions -rw-r--r--
last change Fix compilation warnings
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     1 /**
     2  * $Id: cdi.c,v 1.7 2007-10-06 08:58:00 nkeynes Exp $
     3  *
     4  * CDI CD-image file support
     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 <stdlib.h>
    20 #include <stdio.h>
    21 #include <stdint.h>
    22 #include <fcntl.h>
    23 #include <errno.h>
    24 #include <sys/stat.h>
    25 #include "gdrom/gdrom.h"
    27 #define CDI_V2_ID 0x80000004
    28 #define CDI_V3_ID 0x80000005
    29 #define CDI_V35_ID 0x80000006
    32 static gboolean cdi_image_is_valid( FILE *f );
    33 static gdrom_disc_t cdi_image_open( const gchar *filename, FILE *f );
    35 struct gdrom_image_class cdi_image_class = { "DiscJuggler", "cdi", 
    36 					     cdi_image_is_valid, cdi_image_open };
    38 static const char TRACK_START_MARKER[20] = { 0,0,1,0,0,0,255,255,255,255,
    39                                        0,0,1,0,0,0,255,255,255,255 };
    40 static const char EXT_MARKER[9] = {0,255,255,255,255,255,255,255,255 };
    42 struct cdi_trailer {
    43     uint32_t cdi_version;
    44     uint32_t header_offset;
    45 };
    47 struct cdi_track_data {
    48     char unknown[0x19];
    49     uint32_t pregap_length;
    50     uint32_t length;
    51     char unknown2[6];
    52     uint32_t mode;
    53     char unknown3[0x0c];
    54     uint32_t start_lba;
    55     uint32_t total_length;
    56     char unknown4[0x10];
    57     uint32_t sector_size;
    58     char unknown5[0x1D];
    59 } __attribute__((packed));
    61 gboolean cdi_image_is_valid( FILE *f )
    62 {
    63     int len;
    64     struct cdi_trailer trail;
    66     fseek( f, -8, SEEK_END );
    67     len = ftell(f)+8;
    68     fread( &trail, sizeof(trail), 1, f );
    69     if( trail.header_offset >= len ||
    70         trail.header_offset == 0 )
    71 	return FALSE;
    72     return trail.cdi_version == CDI_V2_ID || trail.cdi_version == CDI_V3_ID;
    73 }
    75 gdrom_disc_t cdi_image_open( const gchar *filename, FILE *f )
    76 {
    77     gdrom_disc_t disc = NULL;
    78     gdrom_image_t image;
    79     int i,j;
    80     uint16_t session_count;
    81     uint16_t track_count;
    82     int total_tracks = 0;
    83     int posn = 0;
    84     long len;
    85     struct cdi_trailer trail;
    86     char marker[20];
    88     fseek( f, -8, SEEK_END );
    89     len = ftell(f)+8;
    90     fread( &trail, sizeof(trail), 1, f );
    91     if( trail.header_offset >= len ||
    92         trail.header_offset == 0 )
    93 	return NULL;
    95     if( trail.cdi_version == CDI_V2_ID ) trail.cdi_version = 2;
    96     else if( trail.cdi_version == CDI_V3_ID ) trail.cdi_version = 3;
    97     else return NULL; 
    99     fseek( f, trail.header_offset, SEEK_SET );
   100     fread( &session_count, sizeof(session_count), 1, f );
   102     disc = gdrom_image_new(f);
   103     if( disc == NULL ) {
   104 	fclose(f);
   105 	ERROR("Unable to allocate memory!");
   106 	return NULL;
   107     }
   108     image = (gdrom_image_t)disc;
   110     for( i=0; i< session_count; i++ ) {        
   111 	fread( &track_count, sizeof(track_count), 1, f );
   112 	if( track_count + total_tracks > 99 ) {
   113 	    ERROR( "Invalid number of tracks, bad cdi image\n" );
   114 	    disc->close(disc);
   115 	    return NULL;
   116 	}
   117         for( j=0; j<track_count; j++ ) {
   118             struct cdi_track_data trk;
   119             uint32_t new_fmt = 0;
   120 	    uint8_t fnamelen = 0;
   121             fread( &new_fmt, sizeof(new_fmt), 1, f );
   122             if( new_fmt != 0 ) { /* Additional data 3.00.780+ ?? */
   123 		fseek( f, 8, SEEK_CUR ); /* Skip */
   124             }
   125             fread( marker, 20, 1, f );
   126             if( memcmp( marker, TRACK_START_MARKER, 20) != 0 ) {
   127 		ERROR( "Track start marker not found, error reading cdi image\n" );
   128 		disc->close(disc);
   129 		return NULL;
   130 	    }
   131 	    fseek( f, 4, SEEK_CUR );
   132             fread( &fnamelen, 1, 1, f );
   133             fseek( f, (int)fnamelen, SEEK_CUR ); /* skip over the filename */
   134             fread( &trk, sizeof(trk), 1, f );
   135 	    image->track[total_tracks].session = i;
   136 	    image->track[total_tracks].lba = trk.start_lba + 150;
   137 	    image->track[total_tracks].sector_count = trk.length;
   138 	    switch( trk.mode ) {
   139 	    case 0:
   140 		image->track[total_tracks].mode = GDROM_CDDA;
   141 		image->track[total_tracks].sector_size = 2352;
   142 		image->track[total_tracks].flags = 0x01;
   143 		if( trk.sector_size != 2 ) {
   144 		    ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
   145 		    disc->close(disc);
   146 		    return NULL;
   147 		}
   148 		break;
   149 	    case 1:
   150 		image->track[total_tracks].mode = GDROM_MODE1;
   151 		image->track[total_tracks].sector_size = 2048;
   152 		image->track[total_tracks].flags = 0x41;
   153 		if( trk.sector_size != 0 ) {
   154 		    ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
   155 		    disc->close(disc);
   156 		    return NULL;
   157 		}
   158 		break;
   159 	    case 2:
   160 		image->track[total_tracks].flags = 0x41;
   161 		switch( trk.sector_size ) {
   162 		case 0:
   163 		    image->track[total_tracks].mode = GDROM_MODE2_XA1;
   164 		    image->track[total_tracks].sector_size = 2048;
   165 		    break;
   166 		case 1:
   167 		    image->track[total_tracks].mode = GDROM_MODE2;
   168 		    image->track[total_tracks].sector_size = 2336;
   169 		    break;
   170 		case 2:
   171 		default:
   172 		    ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
   173 		    disc->close(disc);
   174 		    return NULL;
   175 		}
   176 		break;
   177 	    default:
   178 		ERROR( "Unsupported track mode %d", trk.mode );
   179 		disc->close(disc);
   180 		return NULL;
   181 	    }
   182 	    image->track[total_tracks].offset = posn + 
   183 		trk.pregap_length * image->track[total_tracks].sector_size ;
   184 	    posn += trk.total_length * image->track[total_tracks].sector_size;
   185 	    total_tracks++;
   186 	    fread( marker, 1, 9, f );
   187 	    if( memcmp( marker, EXT_MARKER, 9 ) == 0 ) {
   188 		fseek( f, 91, SEEK_CUR );
   189 	    } else {
   190 		fseek( f, 3, SEEK_CUR );
   191 	    }
   192 	}
   193     }
   194     image->track_count = total_tracks;
   195     image->filename = filename;
   196     return disc;
   197 }
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