--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gdrom/gdrom.c	Sun Apr 30 01:51:08 2006 +0000
@@ -0,0 +1,138 @@
+/**
+ * $Id: gdrom.c,v 1.1 2006-04-30 01:51:08 nkeynes Exp $
+ *
+ * GD-Rom  access functions.
+ *
+ * Copyright (c) 2005 Nathan Keynes.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdio.h>
+
+#include "gdrom/ide.h"
+#include "gdrom/gdrom.h"
+#include "dream.h"
+
+static void gdrom_image_destroy( gdrom_disc_t );
+static uint32_t gdrom_image_read_sectors( gdrom_disc_t, uint32_t, uint32_t, char * );
+
+
+gdrom_disc_t gdrom_disc = NULL;
+
+char *gdrom_mode_names[] = { "Mode1", "Mode2", "XA 1", "XA2", "Audio", "GD-Rom" };
+uint32_t gdrom_sector_size[] = { 2048, 2336, 2048, 2324, 2352, 2336 };
+
+gdrom_disc_t gdrom_image_open( const gchar *filename )
+{
+    return nrg_image_open( filename );
+}
+
+
+gdrom_disc_t gdrom_image_new( FILE *file )
+{
+    struct gdrom_disc *disc = (struct gdrom_disc *)calloc(1, sizeof(struct gdrom_disc));
+    if( disc == NULL )
+	return NULL;
+    disc->read_sectors = gdrom_image_read_sectors;
+    disc->close = gdrom_image_destroy;
+    disc->disc_type = IDE_DISC_CDROM;
+    disc->file = file;
+    return disc;
+}
+
+static void gdrom_image_destroy( gdrom_disc_t disc )
+{
+    if( disc->file != NULL ) {
+	fclose(disc->file);
+	disc->file = NULL;
+    }
+    free( disc );
+}
+
+static uint32_t gdrom_image_read_sectors( gdrom_disc_t disc, uint32_t sector,
+				   uint32_t sector_count, char *buf )
+{
+    int i, track = -1, track_offset, read_len;
+
+    for( i=0; i<disc->track_count; i++ ) {
+	if( disc->track[i].lba <= sector && 
+	    disc->track[i].lba + disc->track[i].sector_count <= sector + sector_count ) {
+	    track = i;
+	    break;
+	}
+    }
+    if( track == -1 )
+	return 0;
+    
+    track_offset = disc->track[track].sector_size * (sector - disc->track[track].lba);
+    read_len = disc->track[track].sector_size * sector_count;
+    fseek( disc->file, disc->track[track].offset + track_offset, SEEK_SET );
+    fread( buf, disc->track[track].sector_size, sector_count, disc->file );
+    return read_len;
+}
+
+uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count,
+			     char *buf )
+{
+    if( gdrom_disc == NULL )
+	return 0; /* No media */
+    return gdrom_disc->read_sectors( gdrom_disc, sector, sector_count, buf );
+}
+
+
+void gdrom_dump_disc( gdrom_disc_t disc ) {
+    int i;
+    INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, 
+	  disc->track[disc->track_count-1].session + 1 );
+    for( i=0; i<disc->track_count; i++ ) {
+	INFO( "Sess %d Trk %d: Start %06X Length %06X, %s",
+	      disc->track[i].session+1, i+1, disc->track[i].lba,
+	      disc->track[i].sector_count, gdrom_mode_names[disc->track[i].mode] );
+    }
+}
+
+gboolean gdrom_get_toc( char *buf ) 
+{
+    if( gdrom_disc == NULL )
+	return FALSE;
+    return TRUE;
+}
+
+void gdrom_mount_disc( gdrom_disc_t disc ) 
+{
+    gdrom_unmount_disc();
+    gdrom_disc = disc;
+    idereg.disc = disc->disc_type | IDE_DISC_READY;
+    gdrom_dump_disc( disc );
+}
+
+gdrom_disc_t gdrom_mount_image( const gchar *filename )
+{
+    gdrom_disc_t disc = gdrom_image_open(filename);
+    if( disc != NULL )
+	gdrom_mount_disc( disc );
+    return disc;
+}
+
+void gdrom_unmount_disc( ) 
+{
+    if( gdrom_disc != NULL ) {
+	gdrom_disc->close(gdrom_disc);
+    }
+    gdrom_disc = NULL;
+    idereg.disc = IDE_DISC_NONE;
+}
+
+gboolean gdrom_is_mounted( void ) 
+{
+    return gdrom_disc != NULL;
+}