1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/gdrom/gdrom.c	Sun Apr 30 01:51:08 2006 +0000
     1.3 @@ -0,0 +1,138 @@
     1.4 +/**
     1.5 + * $Id: gdrom.c,v 1.1 2006-04-30 01:51:08 nkeynes Exp $
     1.6 + *
     1.7 + * GD-Rom  access functions.
     1.8 + *
     1.9 + * Copyright (c) 2005 Nathan Keynes.
    1.10 + *
    1.11 + * This program is free software; you can redistribute it and/or modify
    1.12 + * it under the terms of the GNU General Public License as published by
    1.13 + * the Free Software Foundation; either version 2 of the License, or
    1.14 + * (at your option) any later version.
    1.15 + *
    1.16 + * This program is distributed in the hope that it will be useful,
    1.17 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.18 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.19 + * GNU General Public License for more details.
    1.20 + */
    1.21 +
    1.22 +#include <stdio.h>
    1.23 +
    1.24 +#include "gdrom/ide.h"
    1.25 +#include "gdrom/gdrom.h"
    1.26 +#include "dream.h"
    1.27 +
    1.28 +static void gdrom_image_destroy( gdrom_disc_t );
    1.29 +static uint32_t gdrom_image_read_sectors( gdrom_disc_t, uint32_t, uint32_t, char * );
    1.30 +
    1.31 +
    1.32 +gdrom_disc_t gdrom_disc = NULL;
    1.33 +
    1.34 +char *gdrom_mode_names[] = { "Mode1", "Mode2", "XA 1", "XA2", "Audio", "GD-Rom" };
    1.35 +uint32_t gdrom_sector_size[] = { 2048, 2336, 2048, 2324, 2352, 2336 };
    1.36 +
    1.37 +gdrom_disc_t gdrom_image_open( const gchar *filename )
    1.38 +{
    1.39 +    return nrg_image_open( filename );
    1.40 +}
    1.41 +
    1.42 +
    1.43 +gdrom_disc_t gdrom_image_new( FILE *file )
    1.44 +{
    1.45 +    struct gdrom_disc *disc = (struct gdrom_disc *)calloc(1, sizeof(struct gdrom_disc));
    1.46 +    if( disc == NULL )
    1.47 +	return NULL;
    1.48 +    disc->read_sectors = gdrom_image_read_sectors;
    1.49 +    disc->close = gdrom_image_destroy;
    1.50 +    disc->disc_type = IDE_DISC_CDROM;
    1.51 +    disc->file = file;
    1.52 +    return disc;
    1.53 +}
    1.54 +
    1.55 +static void gdrom_image_destroy( gdrom_disc_t disc )
    1.56 +{
    1.57 +    if( disc->file != NULL ) {
    1.58 +	fclose(disc->file);
    1.59 +	disc->file = NULL;
    1.60 +    }
    1.61 +    free( disc );
    1.62 +}
    1.63 +
    1.64 +static uint32_t gdrom_image_read_sectors( gdrom_disc_t disc, uint32_t sector,
    1.65 +				   uint32_t sector_count, char *buf )
    1.66 +{
    1.67 +    int i, track = -1, track_offset, read_len;
    1.68 +
    1.69 +    for( i=0; i<disc->track_count; i++ ) {
    1.70 +	if( disc->track[i].lba <= sector && 
    1.71 +	    disc->track[i].lba + disc->track[i].sector_count <= sector + sector_count ) {
    1.72 +	    track = i;
    1.73 +	    break;
    1.74 +	}
    1.75 +    }
    1.76 +    if( track == -1 )
    1.77 +	return 0;
    1.78 +    
    1.79 +    track_offset = disc->track[track].sector_size * (sector - disc->track[track].lba);
    1.80 +    read_len = disc->track[track].sector_size * sector_count;
    1.81 +    fseek( disc->file, disc->track[track].offset + track_offset, SEEK_SET );
    1.82 +    fread( buf, disc->track[track].sector_size, sector_count, disc->file );
    1.83 +    return read_len;
    1.84 +}
    1.85 +
    1.86 +uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count,
    1.87 +			     char *buf )
    1.88 +{
    1.89 +    if( gdrom_disc == NULL )
    1.90 +	return 0; /* No media */
    1.91 +    return gdrom_disc->read_sectors( gdrom_disc, sector, sector_count, buf );
    1.92 +}
    1.93 +
    1.94 +
    1.95 +void gdrom_dump_disc( gdrom_disc_t disc ) {
    1.96 +    int i;
    1.97 +    INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, 
    1.98 +	  disc->track[disc->track_count-1].session + 1 );
    1.99 +    for( i=0; i<disc->track_count; i++ ) {
   1.100 +	INFO( "Sess %d Trk %d: Start %06X Length %06X, %s",
   1.101 +	      disc->track[i].session+1, i+1, disc->track[i].lba,
   1.102 +	      disc->track[i].sector_count, gdrom_mode_names[disc->track[i].mode] );
   1.103 +    }
   1.104 +}
   1.105 +
   1.106 +gboolean gdrom_get_toc( char *buf ) 
   1.107 +{
   1.108 +    if( gdrom_disc == NULL )
   1.109 +	return FALSE;
   1.110 +    return TRUE;
   1.111 +}
   1.112 +
   1.113 +void gdrom_mount_disc( gdrom_disc_t disc ) 
   1.114 +{
   1.115 +    gdrom_unmount_disc();
   1.116 +    gdrom_disc = disc;
   1.117 +    idereg.disc = disc->disc_type | IDE_DISC_READY;
   1.118 +    gdrom_dump_disc( disc );
   1.119 +}
   1.120 +
   1.121 +gdrom_disc_t gdrom_mount_image( const gchar *filename )
   1.122 +{
   1.123 +    gdrom_disc_t disc = gdrom_image_open(filename);
   1.124 +    if( disc != NULL )
   1.125 +	gdrom_mount_disc( disc );
   1.126 +    return disc;
   1.127 +}
   1.128 +
   1.129 +void gdrom_unmount_disc( ) 
   1.130 +{
   1.131 +    if( gdrom_disc != NULL ) {
   1.132 +	gdrom_disc->close(gdrom_disc);
   1.133 +    }
   1.134 +    gdrom_disc = NULL;
   1.135 +    idereg.disc = IDE_DISC_NONE;
   1.136 +}
   1.137 +
   1.138 +gboolean gdrom_is_mounted( void ) 
   1.139 +{
   1.140 +    return gdrom_disc != NULL;
   1.141 +}