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lxdream.org :: lxdream/src/gdrom/gdimage.c
lxdream 0.9.1
released Jun 29
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filename src/gdrom/gdimage.c
changeset 736:a02d1475ccfd
prev720:b5594d1ac80a
next759:f16975739abc
author nkeynes
date Mon Jul 14 07:44:42 2008 +0000 (14 years ago)
permissions -rw-r--r--
last change Re-indent everything consistently
Fix include guards for consistency as well
file annotate diff log raw
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     1
/**
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 * $Id$
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 *
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 * GD-Rom image-file common functions. 
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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 <assert.h>
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#include <string.h>
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#include <netinet/in.h>
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#include "gdrom/gddriver.h"
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#include "gdrom/packet.h"
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#include "ecc.h"
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#include "bootstrap.h"
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static void gdrom_image_destroy( gdrom_disc_t disc );
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static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode, 
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                                              unsigned char *buf, uint32_t *readlength );
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static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf );
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static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf );
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static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf );
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static int gdrom_image_drive_status( gdrom_disc_t disc );
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static uint8_t gdrom_default_sync[12] = { 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0 };
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#define SECTOR_HEADER_SIZE 16
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#define SECTOR_SUBHEADER_SIZE 8
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/* Data offset (from start of raw sector) by sector mode */
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static int gdrom_data_offset[] = { 16, 16, 16, 24, 24, 0, 8, 0, 0 };
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struct cdrom_sector_header {
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    uint8_t sync[12];
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    uint8_t msf[3];
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    uint8_t mode;
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    uint8_t subhead[8]; // Mode-2 XA sectors only
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};
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/**
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 * Initialize a gdrom_disc structure with the gdrom_image_* methods
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 */
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void gdrom_image_init( gdrom_disc_t disc )
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{
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    memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
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    disc->read_sector = gdrom_image_read_sector;
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    disc->read_toc = gdrom_image_read_toc;
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    disc->read_session = gdrom_image_read_session;
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    disc->read_position = gdrom_image_read_position;
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    disc->drive_status = gdrom_image_drive_status;
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    disc->play_audio = NULL; /* not supported yet */
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    disc->run_time_slice = NULL; /* not needed */
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    disc->close = gdrom_image_destroy;
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}
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gdrom_disc_t gdrom_image_new( const gchar *filename, FILE *f )
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{
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    gdrom_image_t image = (gdrom_image_t)g_malloc0(sizeof(struct gdrom_image));
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    if( image == NULL ) {
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        return NULL;
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    }
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    image->disc_type = IDE_DISC_CDROMXA;
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    image->file = f;
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    gdrom_disc_t disc = (gdrom_disc_t)image;
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    gdrom_image_init(disc);
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    if( filename == NULL ) {
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        disc->name = NULL;
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    } else {
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        disc->name = g_strdup(filename);
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    }
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    return disc;
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}
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static void gdrom_image_destroy( gdrom_disc_t disc )
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{
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    int i;
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    FILE *lastfile = NULL;
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    gdrom_image_t img = (gdrom_image_t)disc;
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    if( img->file != NULL ) {
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        fclose(img->file);
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        img->file = NULL;
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    }
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    for( i=0; i<img->track_count; i++ ) {
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        if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
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            lastfile = img->track[i].file;
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            fclose(lastfile);
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            img->track[i].file = NULL;
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        }
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    }
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    if( disc->name != NULL ) {
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        g_free( (gpointer)disc->name );
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        disc->name = NULL;
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    }
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    free( disc );
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}
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void gdrom_image_destroy_no_close( gdrom_disc_t disc )
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{
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    int i;
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    FILE *lastfile = NULL;
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    gdrom_image_t img = (gdrom_image_t)disc;
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    if( img->file != NULL ) {
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        img->file = NULL;
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    }
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    for( i=0; i<img->track_count; i++ ) {
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        if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
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            lastfile = img->track[i].file;
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            fclose(lastfile);
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            img->track[i].file = NULL;
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        }
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    }
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    if( disc->name != NULL ) {
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        g_free( (gpointer)disc->name );
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        disc->name = NULL;
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    }
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    free( disc );
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}
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static int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
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{
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    int i;
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    for( i=0; i<image->track_count; i++ ) {
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        if( image->track[i].lba <= lba && 
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                lba < (image->track[i].lba + image->track[i].sector_count) ) {
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            return i+1;
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        }
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    }
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    return -1;
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}
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/**
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 * Read a block from an image file, handling negative file offsets
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 * with 0-fill.
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 */
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static gboolean gdrom_read_block( unsigned char *buf, int file_offset, int length, FILE *f )
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{
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    if( file_offset < 0 ) {
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        int size = -file_offset;
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        if( size >= length ) {
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            memset( buf, 0, length );
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            return TRUE;
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        } else {
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            memset( buf, 0, size );
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            file_offset = 0;
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            length -= size;
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        }
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    }
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    fseek( f, file_offset, SEEK_SET );
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    return fread( buf, length, 1, f ) == 1;
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}
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static void gdrom_build_sector_header( unsigned char *buf, uint32_t lba, 
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                                       gdrom_track_mode_t sector_mode )
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{
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    memcpy( buf, gdrom_default_sync, 12 );
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    cd_build_address( buf, sector_mode, lba );
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}
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/**
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 * Return TRUE if the given read mode + track modes are compatible,
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 * otherwise FALSE.
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 * @param track_mode one of the GDROM_MODE* constants
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 * @param read_mode the READ_CD_MODE from the read request
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 */
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static gboolean gdrom_is_compatible_read_mode( int track_mode, int read_mode )
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{
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    switch( read_mode ) {
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    case READ_CD_MODE_ANY:
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        return TRUE;
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    case READ_CD_MODE_CDDA:
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        return track_mode == GDROM_CDDA;
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    case READ_CD_MODE_1:
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        return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1;
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    case READ_CD_MODE_2_FORM_1:
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        return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1;
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    case READ_CD_MODE_2_FORM_2:
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        return track_mode == GDROM_MODE2_FORM2;
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    case READ_CD_MODE_2:
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        return track_mode == GDROM_MODE2_FORMLESS;
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    default:
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        return FALSE;
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    }
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}
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/**
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 * Determine the start position in a raw sector, and the amount of data to read
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 * in bytes, for a given combination of sector mode and read mode.
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 */ 
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static void gdrom_get_read_bounds( int sector_mode, int read_mode, int *start, int *size )
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{
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    if( READ_CD_RAW(read_mode) ) {
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        // whole sector
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        *start = 0;
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        *size = 2352;
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    } else {
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        *size = 0;
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        if( READ_CD_DATA(read_mode) ) {
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            *start = gdrom_data_offset[sector_mode];
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            *size = gdrom_sector_size[sector_mode];
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        }
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        if( READ_CD_SUBHEAD(read_mode) && 
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                (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
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            *start = SECTOR_HEADER_SIZE;
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            *size += SECTOR_SUBHEADER_SIZE;
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        }
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        if( READ_CD_HEADER(read_mode) ) {
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            *size += SECTOR_HEADER_SIZE;
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            *start = 0;
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        }
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    }
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}
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/**
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 * Read a single sector from a disc image. If you thought this would be simple, 
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 * I have just one thing to say to you: Bwahahahahahahahah.
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 *
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 * Once we've decided that there's a real sector at the requested lba, there's 
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 * really two things we need to care about:
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 *   1. Is the sector mode compatible with the requested read mode
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 *   2. Which parts of the sector do we need to return? 
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 *      (header/subhead/data/raw sector)
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 *
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 * Also note that the disc image may supply us with just the data (most common 
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 * case), or may have the full raw sector. In the former case we may need to 
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 * generate the missing data on the fly, for which we use libedc to compute the
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 * data correction codes.
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 */
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static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
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                                              int mode, unsigned char *buf, uint32_t *length )
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{
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    gdrom_image_t image = (gdrom_image_t)disc;
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    struct cdrom_sector_header secthead;
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    int file_offset, read_len, track_no;
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   251
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   252
    FILE *f;
nkeynes@342
   253
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    track_no = gdrom_image_get_track_by_lba( image, lba );
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   255
    if( track_no == -1 ) {
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   256
        return PKT_ERR_BADREAD;
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   257
    }
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   258
    struct gdrom_track *track = &image->track[track_no-1];
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   259
    file_offset = track->offset + track->sector_size * (lba - track->lba);
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   260
    read_len = track->sector_size;
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   261
    if( track->file != NULL ) {
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   262
        f = track->file;
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   263
    } else {
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   264
        f = image->file;
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   265
    }
nkeynes@492
   266
nkeynes@644
   267
    /* First figure out what the real sector mode is for raw/semiraw sectors */
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   268
    int sector_mode;
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   269
    switch( track->mode ) {
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   270
    case GDROM_RAW_NONXA:
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   271
        gdrom_read_block( (unsigned char *)(&secthead), file_offset, sizeof(secthead), f );
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   272
        sector_mode = (secthead.mode == 1) ? GDROM_MODE1 : GDROM_MODE2_FORMLESS;
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   273
        break;
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   274
    case GDROM_RAW_XA:
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   275
        gdrom_read_block( (unsigned char *)(&secthead), file_offset, sizeof(secthead), f );
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   276
        if( secthead.mode == 1 ) {
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   277
            sector_mode = GDROM_MODE1;
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   278
        } else {
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   279
            sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
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   280
        }
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   281
        break;
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   282
    case GDROM_SEMIRAW_MODE2:
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   283
        gdrom_read_block( secthead.subhead, file_offset, 8, f );
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   284
        sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
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   285
        break;
nkeynes@342
   286
    default:
nkeynes@736
   287
        /* In the other cases, the track mode completely defines the sector mode */
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   288
        sector_mode = track->mode;
nkeynes@736
   289
        break;
nkeynes@644
   290
    }
nkeynes@644
   291
nkeynes@644
   292
    if( !gdrom_is_compatible_read_mode(sector_mode, READ_CD_MODE(mode)) ) {
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   293
        return PKT_ERR_BADREADMODE;
nkeynes@342
   294
    }
nkeynes@644
   295
nkeynes@644
   296
    /* Ok, we've got a valid sector, check what parts of the sector we need to
nkeynes@644
   297
     * return - header | subhead | data | everything
nkeynes@644
   298
     */
nkeynes@644
   299
    int channels = READ_CD_CHANNELS(mode);
nkeynes@644
   300
nkeynes@644
   301
    if( channels == 0 ) {
nkeynes@736
   302
        // legal, if weird
nkeynes@736
   303
        *length = 0;
nkeynes@736
   304
        return PKT_ERR_OK;
nkeynes@644
   305
    } else if( channels == 0xA0 && 
nkeynes@736
   306
            (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2 )) {
nkeynes@736
   307
        // caller requested a non-contiguous region
nkeynes@736
   308
        return PKT_ERR_BADFIELD;
nkeynes@644
   309
    } else if( READ_CD_RAW(channels) ) {
nkeynes@736
   310
        channels = 0xF0; // implies everything
nkeynes@644
   311
    }
nkeynes@644
   312
nkeynes@644
   313
    read_len = 0;
nkeynes@644
   314
    int start, size;
nkeynes@644
   315
    switch( track->mode ) {
nkeynes@644
   316
    case GDROM_CDDA:
nkeynes@736
   317
        // audio is nice and simple (assume perfect reads for now)
nkeynes@736
   318
        *length = 2352;
nkeynes@736
   319
        gdrom_read_block( buf, file_offset, track->sector_size, f );
nkeynes@736
   320
        return PKT_ERR_OK;
nkeynes@644
   321
    case GDROM_RAW_XA:
nkeynes@644
   322
    case GDROM_RAW_NONXA:
nkeynes@736
   323
        gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@736
   324
        gdrom_read_block( buf, file_offset+start, size, f );
nkeynes@736
   325
        read_len = size;
nkeynes@736
   326
        break;
nkeynes@644
   327
    case GDROM_SEMIRAW_MODE2:
nkeynes@736
   328
        gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@736
   329
        if( READ_CD_HEADER(channels) ) {
nkeynes@736
   330
            gdrom_build_sector_header( buf, lba, sector_mode );
nkeynes@736
   331
            read_len += SECTOR_HEADER_SIZE;
nkeynes@736
   332
            size -= SECTOR_HEADER_SIZE;
nkeynes@736
   333
        } else {
nkeynes@736
   334
            start -= SECTOR_HEADER_SIZE;
nkeynes@736
   335
        }
nkeynes@736
   336
        gdrom_read_block( buf + read_len, file_offset+start, size, f );
nkeynes@736
   337
        read_len += size;
nkeynes@736
   338
        break;
nkeynes@644
   339
    default: // Data track w/ data only in file
nkeynes@736
   340
        if( READ_CD_RAW(channels) ) {
nkeynes@736
   341
            gdrom_read_block( buf + gdrom_data_offset[track->mode], file_offset, 
nkeynes@736
   342
                    track->sector_size, f );
nkeynes@736
   343
            do_encode_L2( buf, sector_mode, lba );
nkeynes@736
   344
            read_len = 2352;
nkeynes@736
   345
        } else {
nkeynes@736
   346
            if( READ_CD_HEADER(channels) ) {
nkeynes@736
   347
                gdrom_build_sector_header( buf, lba, sector_mode );
nkeynes@736
   348
                read_len += SECTOR_HEADER_SIZE;
nkeynes@736
   349
            }
nkeynes@736
   350
            if( READ_CD_SUBHEAD(channels) && 
nkeynes@736
   351
                    (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
nkeynes@736
   352
                if( sector_mode == GDROM_MODE2_FORM1 ) {
nkeynes@736
   353
                    *((uint32_t *)(buf+read_len)) = 0;
nkeynes@736
   354
                    *((uint32_t *)(buf+read_len+4)) = 0;
nkeynes@736
   355
                } else {
nkeynes@736
   356
                    *((uint32_t *)(buf+read_len)) = 0x00200000;
nkeynes@736
   357
                    *((uint32_t *)(buf+read_len+4)) = 0x00200000;
nkeynes@736
   358
                }
nkeynes@736
   359
                read_len += 8;
nkeynes@736
   360
            }
nkeynes@736
   361
            if( READ_CD_DATA(channels) ) {
nkeynes@736
   362
                gdrom_read_block( buf+read_len, file_offset, track->sector_size, f );
nkeynes@736
   363
                read_len += track->sector_size;
nkeynes@736
   364
            }
nkeynes@736
   365
        }
nkeynes@644
   366
    }
nkeynes@342
   367
    *length = read_len;
nkeynes@342
   368
    return PKT_ERR_OK;
nkeynes@342
   369
}
nkeynes@342
   370
nkeynes@422
   371
static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf ) 
nkeynes@342
   372
{
nkeynes@342
   373
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   374
    struct gdrom_toc *toc = (struct gdrom_toc *)buf;
nkeynes@342
   375
    int i;
nkeynes@342
   376
nkeynes@342
   377
    for( i=0; i<image->track_count; i++ ) {
nkeynes@736
   378
        toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
nkeynes@342
   379
    }
nkeynes@342
   380
    toc->first = 0x0100 | image->track[0].flags;
nkeynes@342
   381
    toc->last = (image->track_count<<8) | image->track[i-1].flags;
nkeynes@342
   382
    toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
nkeynes@736
   383
    image->track[i-1].flags;
nkeynes@342
   384
    for( ;i<99; i++ )
nkeynes@736
   385
        toc->track[i] = 0xFFFFFFFF;
nkeynes@342
   386
    return PKT_ERR_OK;
nkeynes@342
   387
}
nkeynes@342
   388
nkeynes@422
   389
static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf )
nkeynes@342
   390
{
nkeynes@342
   391
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   392
    struct gdrom_track *last_track = &image->track[image->track_count-1];
nkeynes@342
   393
    unsigned int end_of_disc = last_track->lba + last_track->sector_count;
nkeynes@342
   394
    int i;
nkeynes@342
   395
    buf[0] = 0x01; /* Disc status? */
nkeynes@342
   396
    buf[1] = 0;
nkeynes@342
   397
nkeynes@342
   398
    if( session == 0 ) {
nkeynes@736
   399
        buf[2] = last_track->session+1; /* last session */
nkeynes@736
   400
        buf[3] = (end_of_disc >> 16) & 0xFF;
nkeynes@736
   401
        buf[4] = (end_of_disc >> 8) & 0xFF;
nkeynes@736
   402
        buf[5] = end_of_disc & 0xFF;
nkeynes@736
   403
        return PKT_ERR_OK;
nkeynes@342
   404
    } else {
nkeynes@736
   405
        session--;
nkeynes@736
   406
        for( i=0; i<image->track_count; i++ ) {
nkeynes@736
   407
            if( image->track[i].session == session ) {
nkeynes@736
   408
                buf[2] = i+1; /* first track of session */
nkeynes@736
   409
                buf[3] = (image->track[i].lba >> 16) & 0xFF;
nkeynes@736
   410
                buf[4] = (image->track[i].lba >> 8) & 0xFF;
nkeynes@736
   411
                buf[5] = image->track[i].lba & 0xFF;
nkeynes@736
   412
                return PKT_ERR_OK;
nkeynes@736
   413
            }
nkeynes@736
   414
        }
nkeynes@736
   415
        return PKT_ERR_BADFIELD; /* No such session */
nkeynes@342
   416
    }
nkeynes@342
   417
}
nkeynes@342
   418
nkeynes@422
   419
static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf )
nkeynes@342
   420
{
nkeynes@342
   421
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   422
    int track_no = gdrom_image_get_track_by_lba( image, lba );
nkeynes@342
   423
    if( track_no == -1 ) {
nkeynes@736
   424
        track_no = 1;
nkeynes@736
   425
        lba = 150;
nkeynes@342
   426
    }
nkeynes@342
   427
    struct gdrom_track *track = &image->track[track_no-1];
nkeynes@342
   428
    uint32_t offset = lba - track->lba;
nkeynes@342
   429
    buf[4] = track->flags;
nkeynes@342
   430
    buf[5] = track_no;
nkeynes@342
   431
    buf[6] = 0x01; /* ?? */
nkeynes@342
   432
    buf[7] = (offset >> 16) & 0xFF;
nkeynes@342
   433
    buf[8] = (offset >> 8) & 0xFF;
nkeynes@342
   434
    buf[9] = offset & 0xFF;
nkeynes@342
   435
    buf[10] = 0;
nkeynes@342
   436
    buf[11] = (lba >> 16) & 0xFF;
nkeynes@342
   437
    buf[12] = (lba >> 8) & 0xFF;
nkeynes@342
   438
    buf[13] = lba & 0xFF;
nkeynes@422
   439
    return PKT_ERR_OK;
nkeynes@342
   440
}
nkeynes@342
   441
nkeynes@342
   442
static int gdrom_image_drive_status( gdrom_disc_t disc ) 
nkeynes@342
   443
{
nkeynes@342
   444
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@720
   445
    if( image->disc_type == IDE_DISC_NONE ) {
nkeynes@720
   446
        return IDE_DISC_NONE;
nkeynes@720
   447
    } else {
nkeynes@720
   448
        return image->disc_type | IDE_DISC_READY;
nkeynes@720
   449
    }
nkeynes@342
   450
}
nkeynes@342
   451
nkeynes@342
   452
void gdrom_image_dump_info( gdrom_disc_t d ) {
nkeynes@342
   453
    gdrom_image_t disc = (gdrom_image_t)d;
nkeynes@342
   454
    int i;
nkeynes@342
   455
    int last_session = disc->track[disc->track_count-1].session;
nkeynes@342
   456
    gboolean is_bootable = FALSE;
nkeynes@342
   457
nkeynes@342
   458
    INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, 
nkeynes@736
   459
          disc->track[disc->track_count-1].session + 1 );
nkeynes@342
   460
    if( last_session > 0 ) {
nkeynes@736
   461
        /* Boot track is the first data track of the last session, provided that it 
nkeynes@736
   462
         * cannot be a single-session disc.
nkeynes@736
   463
         */
nkeynes@736
   464
        int boot_track = -1;
nkeynes@736
   465
        for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
nkeynes@736
   466
            if( disc->track[i].flags & TRACK_DATA ) {
nkeynes@736
   467
                boot_track = i;
nkeynes@736
   468
            }
nkeynes@736
   469
        }
nkeynes@736
   470
        if( boot_track != -1 ) {
nkeynes@736
   471
            unsigned char boot_sector[MAX_SECTOR_SIZE];
nkeynes@736
   472
            uint32_t length = sizeof(boot_sector);
nkeynes@736
   473
            if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
nkeynes@736
   474
                    boot_sector, &length ) == PKT_ERR_OK ) {
nkeynes@736
   475
                bootstrap_dump(boot_sector, FALSE);
nkeynes@736
   476
                is_bootable = TRUE;
nkeynes@736
   477
            }
nkeynes@736
   478
        }
nkeynes@342
   479
    }
nkeynes@342
   480
    if( !is_bootable ) {
nkeynes@736
   481
        WARN( "Disc does not appear to be bootable" );
nkeynes@342
   482
    }
nkeynes@342
   483
}
nkeynes@342
   484
nkeynes@709
   485
gdrom_device_t gdrom_device_new( const gchar *name, const gchar *dev_name )
nkeynes@709
   486
{
nkeynes@709
   487
    struct gdrom_device *dev = g_malloc0( sizeof(struct gdrom_device) );
nkeynes@709
   488
    dev->name = g_strdup(name);
nkeynes@709
   489
    dev->device_name = g_strdup(dev_name);
nkeynes@709
   490
    return dev;
nkeynes@709
   491
}
nkeynes@709
   492
nkeynes@709
   493
void gdrom_device_destroy( gdrom_device_t dev )
nkeynes@709
   494
{
nkeynes@709
   495
    if( dev->name != NULL ) {
nkeynes@709
   496
        g_free( dev->name );
nkeynes@709
   497
        dev->name = NULL;
nkeynes@709
   498
    }
nkeynes@709
   499
    if( dev->device_name != NULL ) {
nkeynes@709
   500
        g_free( dev->device_name );
nkeynes@709
   501
        dev->device_name = NULL;
nkeynes@709
   502
    }
nkeynes@709
   503
    g_free( dev );
nkeynes@709
   504
}
.