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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 464:8e099fad42a6
prev453:20f9c11e69e5
next468:3a49695e081a
author nkeynes
date Sat Oct 27 05:44:54 2007 +0000 (13 years ago)
permissions -rw-r--r--
last change Initial gdrom attachment menu
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     1 /**
     2  * $Id: cdi.c,v 1.9 2007-10-27 05:44:54 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 	trail.cdi_version == CDI_V35_ID;
    74 }
    76 gdrom_disc_t cdi_image_open( const gchar *filename, FILE *f )
    77 {
    78     gdrom_disc_t disc = NULL;
    79     gdrom_image_t image;
    80     int i,j;
    81     uint16_t session_count;
    82     uint16_t track_count;
    83     int total_tracks = 0;
    84     int posn = 0;
    85     long len;
    86     struct cdi_trailer trail;
    87     char marker[20];
    89     fseek( f, -8, SEEK_END );
    90     len = ftell(f)+8;
    91     fread( &trail, sizeof(trail), 1, f );
    92     if( trail.header_offset >= len ||
    93         trail.header_offset == 0 )
    94 	return NULL;
    96     if( trail.cdi_version != CDI_V2_ID && trail.cdi_version != CDI_V3_ID &&
    97 	trail.cdi_version != CDI_V35_ID ) {
    98 	return NULL;
    99     }
   101     if( trail.cdi_version == CDI_V35_ID ) {
   102 	fseek( f, -trail.header_offset, SEEK_END );
   103     } else {
   104 	fseek( f, trail.header_offset, SEEK_SET );
   105     }
   106     fread( &session_count, sizeof(session_count), 1, f );
   108     disc = gdrom_image_new(filename, f);
   109     if( disc == NULL ) {
   110 	fclose(f);
   111 	ERROR("Unable to allocate memory!");
   112 	return NULL;
   113     }
   114     image = (gdrom_image_t)disc;
   116     for( i=0; i< session_count; i++ ) {        
   117 	fread( &track_count, sizeof(track_count), 1, f );
   118 	if( track_count + total_tracks > 99 ) {
   119 	    ERROR( "Invalid number of tracks, bad cdi image\n" );
   120 	    disc->close(disc);
   121 	    return NULL;
   122 	}
   123         for( j=0; j<track_count; j++ ) {
   124             struct cdi_track_data trk;
   125             uint32_t new_fmt = 0;
   126 	    uint8_t fnamelen = 0;
   127             fread( &new_fmt, sizeof(new_fmt), 1, f );
   128             if( new_fmt != 0 ) { /* Additional data 3.00.780+ ?? */
   129 		fseek( f, 8, SEEK_CUR ); /* Skip */
   130             }
   131             fread( marker, 20, 1, f );
   132             if( memcmp( marker, TRACK_START_MARKER, 20) != 0 ) {
   133 		ERROR( "Track start marker not found, error reading cdi image\n" );
   134 		disc->close(disc);
   135 		return NULL;
   136 	    }
   137 	    fseek( f, 4, SEEK_CUR );
   138             fread( &fnamelen, 1, 1, f );
   139             fseek( f, (int)fnamelen, SEEK_CUR ); /* skip over the filename */
   140             fread( &trk, sizeof(trk), 1, f );
   141 	    image->track[total_tracks].session = i;
   142 	    image->track[total_tracks].lba = trk.start_lba + 150;
   143 	    image->track[total_tracks].sector_count = trk.length;
   144 	    switch( trk.mode ) {
   145 	    case 0:
   146 		image->track[total_tracks].mode = GDROM_CDDA;
   147 		image->track[total_tracks].sector_size = 2352;
   148 		image->track[total_tracks].flags = 0x01;
   149 		if( trk.sector_size != 2 ) {
   150 		    ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
   151 		    disc->close(disc);
   152 		    return NULL;
   153 		}
   154 		break;
   155 	    case 1:
   156 		image->track[total_tracks].mode = GDROM_MODE1;
   157 		image->track[total_tracks].sector_size = 2048;
   158 		image->track[total_tracks].flags = 0x41;
   159 		if( trk.sector_size != 0 ) {
   160 		    ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
   161 		    disc->close(disc);
   162 		    return NULL;
   163 		}
   164 		break;
   165 	    case 2:
   166 		image->track[total_tracks].flags = 0x41;
   167 		switch( trk.sector_size ) {
   168 		case 0:
   169 		    image->track[total_tracks].mode = GDROM_MODE2_XA1;
   170 		    image->track[total_tracks].sector_size = 2048;
   171 		    break;
   172 		case 1:
   173 		    image->track[total_tracks].mode = GDROM_MODE2;
   174 		    image->track[total_tracks].sector_size = 2336;
   175 		    break;
   176 		case 2:
   177 		default:
   178 		    ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
   179 		    disc->close(disc);
   180 		    return NULL;
   181 		}
   182 		break;
   183 	    default:
   184 		ERROR( "Unsupported track mode %d", trk.mode );
   185 		disc->close(disc);
   186 		return NULL;
   187 	    }
   188 	    image->track[total_tracks].offset = posn + 
   189 		trk.pregap_length * image->track[total_tracks].sector_size ;
   190 	    posn += trk.total_length * image->track[total_tracks].sector_size;
   191 	    total_tracks++;
   192 	    fread( marker, 1, 9, f );
   193 	    if( memcmp( marker, EXT_MARKER, 9 ) == 0 ) {
   194 		fseek( f, 91, SEEK_CUR );
   195 	    } else {
   196 		fseek( f, 3, SEEK_CUR );
   197 	    }
   198 	}
   199     }
   200     image->track_count = total_tracks;
   201     return disc;
   202 }
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