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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 342:850502f0e8de
prev236:581a9f8bf6a6
next347:e686be8b10df
author nkeynes
date Wed Jan 31 10:58:42 2007 +0000 (14 years ago)
permissions -rw-r--r--
last change Refactor gdrom module to be more conducive to real device support
file annotate diff log raw
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/**
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 * $Id: cdi.c,v 1.5 2007-01-31 10:58:42 nkeynes Exp $
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 *
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 * CDI CD-image file support
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 *
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 * Copyright (c) 2005 Nathan Keynes.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 */
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include "gdrom/gdrom.h"
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#define CDI_V2_ID 0x80000004
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#define CDI_V3_ID 0x80000005
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#define CDI_V35_ID 0x80000006
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static gboolean cdi_image_is_valid( FILE *f );
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static gdrom_disc_t cdi_image_open( const gchar *filename, FILE *f );
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struct gdrom_image_class cdi_image_class = { "DiscJuggler", "cdi", 
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					     cdi_image_is_valid, cdi_image_open };
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static char track_start_marker[20] = { 0,0,1,0,0,0,255,255,255,255,
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                                       0,0,1,0,0,0,255,255,255,255 };
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struct cdi_trailer {
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    uint32_t cdi_version;
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    uint32_t header_offset;
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};
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struct cdi_track_data {
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    char unknown[0x19];
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    uint32_t pregap_length;
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    uint32_t length;
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    char unknown2[6];
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    uint32_t mode;
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    char unknown3[0x0c];
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    uint32_t start_lba;
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    uint32_t total_length;
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    char unknown4[0x10];
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    uint32_t sector_size;
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    char unknown5[0x1D];
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} __attribute__((packed));
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gboolean cdi_image_is_valid( FILE *f )
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{
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    int len;
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    struct cdi_trailer trail;
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    fseek( f, -8, SEEK_END );
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    len = ftell(f)+8;
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    fread( &trail, sizeof(trail), 1, f );
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    if( trail.header_offset >= len ||
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        trail.header_offset == 0 )
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	return FALSE;
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    return trail.cdi_version == CDI_V2_ID || trail.cdi_version == CDI_V3_ID;
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}
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gdrom_disc_t cdi_image_open( const gchar *filename, FILE *f )
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{
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    gdrom_disc_t disc = NULL;
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    gdrom_image_t image;
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    int fd = -1, i,j, tmp;
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    uint16_t session_count;
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    uint16_t track_count;
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    int total_tracks = 0;
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    int posn = 0, hdr;
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    long len;
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    struct cdi_trailer trail;
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    uint32_t new_fmt;
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    char tmpc;
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    char marker[20];
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    fseek( f, -8, SEEK_END );
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    len = ftell(f)+8;
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    fread( &trail, sizeof(trail), 1, f );
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    if( trail.header_offset >= len ||
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        trail.header_offset == 0 )
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	return NULL;
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    if( trail.cdi_version == CDI_V2_ID ) trail.cdi_version = 2;
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    else if( trail.cdi_version == CDI_V3_ID ) trail.cdi_version = 3;
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    else return NULL; 
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    fseek( f, trail.header_offset, SEEK_SET );
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    fread( &session_count, sizeof(session_count), 1, f );
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    disc = gdrom_image_new(f);
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    if( disc == NULL ) {
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	fclose(f);
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	ERROR("Unable to allocate memory!");
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	return NULL;
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    }
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    image = (gdrom_image_t)disc;
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    for( i=0; i< session_count; i++ ) {        
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	fread( &track_count, sizeof(track_count), 1, f );
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        for( j=0; j<track_count; j++ ) {
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            struct cdi_track_data trk;
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            uint32_t new_fmt = 0;
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	    uint8_t fnamelen = 0;
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            fread( &new_fmt, sizeof(new_fmt), 1, f );
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            if( new_fmt != 0 ) { /* Additional data 3.00.780+ ?? */
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		fseek( f, 8, SEEK_CUR ); /* Skip */
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            }
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            fread( marker, 20, 1, f );
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            if( memcmp( marker, track_start_marker, 20) != 0 ) {
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		ERROR( "Track start marker not found, error reading cdi image\n" );
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		disc->close(disc);
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		return NULL;
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	    }
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	    fseek( f, 4, SEEK_CUR );
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            fread( &fnamelen, 1, 1, f );
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            fseek( f, (int)fnamelen, SEEK_CUR ); /* skip over the filename */
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            fread( &trk, sizeof(trk), 1, f );
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	    image->track[total_tracks].session = i;
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	    image->track[total_tracks].lba = trk.start_lba + 150;
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	    image->track[total_tracks].sector_count = trk.length;
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	    switch( trk.mode ) {
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	    case 0:
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		image->track[total_tracks].mode = GDROM_CDDA;
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		image->track[total_tracks].sector_size = 2352;
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		image->track[total_tracks].flags = 0x01;
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		if( trk.sector_size != 2 ) {
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		    ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
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		    disc->close(disc);
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		    return NULL;
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		}
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		break;
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	    case 1:
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		image->track[total_tracks].mode = GDROM_MODE1;
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		image->track[total_tracks].sector_size = 2048;
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		image->track[total_tracks].flags = 0x41;
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		if( trk.sector_size != 0 ) {
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		    ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
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		    disc->close(disc);
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		    return NULL;
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		}
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		break;
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	    case 2:
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		image->track[total_tracks].flags = 0x41;
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		switch( trk.sector_size ) {
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		case 0:
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		    image->track[total_tracks].mode = GDROM_MODE2_XA1;
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		    image->track[total_tracks].sector_size = 2048;
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		    break;
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		case 1:
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		    image->track[total_tracks].mode = GDROM_MODE2;
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		    image->track[total_tracks].sector_size = 2336;
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		    break;
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		case 2:
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		default:
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		    ERROR( "Invalid combination of mode %d with size %d", trk.mode, trk.sector_size );
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		    disc->close(disc);
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		    return NULL;
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		}
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		break;
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	    default:
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		ERROR( "Unsupported track mode %d", trk.mode );
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		disc->close(disc);
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		return NULL;
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	    }
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	    image->track[total_tracks].offset = posn + 
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		trk.pregap_length * image->track[total_tracks].sector_size ;
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	    posn += trk.total_length * image->track[total_tracks].sector_size;
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	    total_tracks++;
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            lseek( fd, 12, SEEK_CUR );
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            if( new_fmt ) {
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                fseek( f, 90, SEEK_CUR );
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	    } else {
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		fseek( f, 12, SEEK_CUR );
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	    }
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	}
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    }
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    image->track_count = total_tracks;
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    image->filename = filename;
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    return disc;
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}
.