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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 782:1af8b5ce627c
prev759:f16975739abc
next796:a2dc83592467
author nkeynes
date Tue Jul 29 06:35:28 2008 +0000 (14 years ago)
permissions -rw-r--r--
last change Workaround OS X's inability to handle CD reads of unknown size (ie where the read
request failed to specify an expected sector type) - read raw sectors and parse it
out by hand.
file annotate diff log raw
nkeynes@342
     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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     9
 * 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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    15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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    17
 */
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    18
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    19
#include <assert.h>
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    20
#include <stdlib.h>
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#include <string.h>
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#include <netinet/in.h>
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    23
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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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    27
#include "bootstrap.h"
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    28
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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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    31
                                              unsigned char *buf, uint32_t *readlength );
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    32
static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf );
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    33
static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf );
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    34
static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf );
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    35
static int gdrom_image_drive_status( gdrom_disc_t disc );
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    36
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static uint8_t gdrom_default_sync[12] = { 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0 };
nkeynes@644
    38
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    39
#define SECTOR_HEADER_SIZE 16
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    40
#define SECTOR_SUBHEADER_SIZE 8
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    41
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    42
/* 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 };
nkeynes@644
    44
nkeynes@644
    45
nkeynes@644
    46
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struct cdrom_sector_header {
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    48
    uint8_t sync[12];
nkeynes@498
    49
    uint8_t msf[3];
nkeynes@498
    50
    uint8_t mode;
nkeynes@644
    51
    uint8_t subhead[8]; // Mode-2 XA sectors only
nkeynes@498
    52
};
nkeynes@342
    53
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    54
/**
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 * Initialize a gdrom_disc structure with the gdrom_image_* methods
nkeynes@342
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 */
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    57
void gdrom_image_init( gdrom_disc_t disc )
nkeynes@342
    58
{
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    59
    memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
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    60
    disc->read_sector = gdrom_image_read_sector;
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    61
    disc->read_toc = gdrom_image_read_toc;
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    62
    disc->read_session = gdrom_image_read_session;
nkeynes@342
    63
    disc->read_position = gdrom_image_read_position;
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    64
    disc->drive_status = gdrom_image_drive_status;
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    65
    disc->play_audio = NULL; /* not supported yet */
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    disc->run_time_slice = NULL; /* not needed */
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    67
    disc->close = gdrom_image_destroy;
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    68
}
nkeynes@342
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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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    74
        return NULL;
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    75
    }
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    image->disc_type = IDE_DISC_CDROMXA;
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    77
    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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    82
    } else {
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        disc->name = g_strdup(filename);
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    }
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    85
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    return disc;
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    87
}
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static void gdrom_image_destroy( gdrom_disc_t disc )
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    90
{
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    int i;
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    92
    FILE *lastfile = NULL;
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    gdrom_image_t img = (gdrom_image_t)disc;
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    94
    if( img->file != NULL ) {
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    95
        fclose(img->file);
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        img->file = NULL;
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    97
    }
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    98
    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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   104
    }
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   105
    if( disc->name != NULL ) {
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        g_free( (gpointer)disc->name );
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   107
        disc->name = NULL;
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   108
    }
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    free( disc );
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}
nkeynes@342
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void gdrom_image_destroy_no_close( gdrom_disc_t disc )
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   113
{
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   114
    int i;
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   115
    FILE *lastfile = NULL;
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   116
    gdrom_image_t img = (gdrom_image_t)disc;
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   117
    if( img->file != NULL ) {
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   118
        img->file = NULL;
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   119
    }
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   120
    for( i=0; i<img->track_count; i++ ) {
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   121
        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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   127
    if( disc->name != NULL ) {
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        g_free( (gpointer)disc->name );
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        disc->name = NULL;
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   130
    }
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    free( disc );
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   132
}
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int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
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   135
{
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   136
    int i;
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   137
    for( i=0; i<image->track_count; i++ ) {
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   138
        if( image->track[i].lba <= lba && 
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   139
                lba < (image->track[i].lba + image->track[i].sector_count) ) {
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   140
            return i+1;
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   141
        }
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   142
    }
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    return -1;
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   144
}
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   145
nkeynes@492
   146
/**
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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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   149
 */
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static gboolean gdrom_read_block( unsigned char *buf, int file_offset, int length, FILE *f )
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   151
{
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   152
    if( file_offset < 0 ) {
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   153
        int size = -file_offset;
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   154
        if( size >= length ) {
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   155
            memset( buf, 0, length );
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            return TRUE;
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   157
        } 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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   181
{
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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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        }
nkeynes@644
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nkeynes@736
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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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   221
        }
nkeynes@644
   222
nkeynes@736
   223
        if( READ_CD_HEADER(read_mode) ) {
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            *size += SECTOR_HEADER_SIZE;
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            *start = 0;
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   226
        }
nkeynes@644
   227
nkeynes@644
   228
    }
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   229
}
nkeynes@644
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nkeynes@782
   231
void gdrom_extract_raw_data_sector( char *sector_data, int channels, unsigned char *buf, uint32_t *length )
nkeynes@782
   232
{
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    int sector_mode;
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    int start, size;
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    struct cdrom_sector_header *secthead = (struct cdrom_sector_header *)sector_data;
nkeynes@782
   236
    if( secthead->mode == 1 ) {
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        sector_mode = GDROM_MODE1;
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   238
    } else {
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        sector_mode = ((secthead->subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
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    }
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    gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@782
   242
    
nkeynes@782
   243
    memcpy( buf, sector_data+start, size );
nkeynes@782
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    *length = size;
nkeynes@782
   245
}
nkeynes@782
   246
nkeynes@644
   247
/**
nkeynes@644
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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.
nkeynes@644
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 *
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 * Once we've decided that there's a real sector at the requested lba, there's 
nkeynes@644
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 * really two things we need to care about:
nkeynes@644
   253
 *   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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   255
 *      (header/subhead/data/raw sector)
nkeynes@644
   256
 *
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   257
 * Also note that the disc image may supply us with just the data (most common 
nkeynes@644
   258
 * case), or may have the full raw sector. In the former case we may need to 
nkeynes@644
   259
 * generate the missing data on the fly, for which we use libedc to compute the
nkeynes@644
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 * data correction codes.
nkeynes@644
   261
 */
nkeynes@342
   262
static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
nkeynes@736
   263
                                              int mode, unsigned char *buf, uint32_t *length )
nkeynes@342
   264
{
nkeynes@342
   265
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@498
   266
    struct cdrom_sector_header secthead;
nkeynes@422
   267
    int file_offset, read_len, track_no;
nkeynes@498
   268
nkeynes@492
   269
    FILE *f;
nkeynes@342
   270
nkeynes@342
   271
    track_no = gdrom_image_get_track_by_lba( image, lba );
nkeynes@342
   272
    if( track_no == -1 ) {
nkeynes@736
   273
        return PKT_ERR_BADREAD;
nkeynes@342
   274
    }
nkeynes@342
   275
    struct gdrom_track *track = &image->track[track_no-1];
nkeynes@342
   276
    file_offset = track->offset + track->sector_size * (lba - track->lba);
nkeynes@342
   277
    read_len = track->sector_size;
nkeynes@492
   278
    if( track->file != NULL ) {
nkeynes@736
   279
        f = track->file;
nkeynes@492
   280
    } else {
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   281
        f = image->file;
nkeynes@492
   282
    }
nkeynes@492
   283
nkeynes@644
   284
    /* First figure out what the real sector mode is for raw/semiraw sectors */
nkeynes@644
   285
    int sector_mode;
nkeynes@644
   286
    switch( track->mode ) {
nkeynes@644
   287
    case GDROM_RAW_NONXA:
nkeynes@736
   288
        gdrom_read_block( (unsigned char *)(&secthead), file_offset, sizeof(secthead), f );
nkeynes@736
   289
        sector_mode = (secthead.mode == 1) ? GDROM_MODE1 : GDROM_MODE2_FORMLESS;
nkeynes@736
   290
        break;
nkeynes@644
   291
    case GDROM_RAW_XA:
nkeynes@736
   292
        gdrom_read_block( (unsigned char *)(&secthead), file_offset, sizeof(secthead), f );
nkeynes@736
   293
        if( secthead.mode == 1 ) {
nkeynes@736
   294
            sector_mode = GDROM_MODE1;
nkeynes@736
   295
        } else {
nkeynes@736
   296
            sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
nkeynes@736
   297
        }
nkeynes@736
   298
        break;
nkeynes@644
   299
    case GDROM_SEMIRAW_MODE2:
nkeynes@736
   300
        gdrom_read_block( secthead.subhead, file_offset, 8, f );
nkeynes@736
   301
        sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
nkeynes@736
   302
        break;
nkeynes@342
   303
    default:
nkeynes@736
   304
        /* In the other cases, the track mode completely defines the sector mode */
nkeynes@736
   305
        sector_mode = track->mode;
nkeynes@736
   306
        break;
nkeynes@644
   307
    }
nkeynes@644
   308
nkeynes@644
   309
    if( !gdrom_is_compatible_read_mode(sector_mode, READ_CD_MODE(mode)) ) {
nkeynes@736
   310
        return PKT_ERR_BADREADMODE;
nkeynes@342
   311
    }
nkeynes@644
   312
nkeynes@644
   313
    /* Ok, we've got a valid sector, check what parts of the sector we need to
nkeynes@644
   314
     * return - header | subhead | data | everything
nkeynes@644
   315
     */
nkeynes@644
   316
    int channels = READ_CD_CHANNELS(mode);
nkeynes@644
   317
nkeynes@644
   318
    if( channels == 0 ) {
nkeynes@736
   319
        // legal, if weird
nkeynes@736
   320
        *length = 0;
nkeynes@736
   321
        return PKT_ERR_OK;
nkeynes@644
   322
    } else if( channels == 0xA0 && 
nkeynes@736
   323
            (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2 )) {
nkeynes@736
   324
        // caller requested a non-contiguous region
nkeynes@736
   325
        return PKT_ERR_BADFIELD;
nkeynes@644
   326
    } else if( READ_CD_RAW(channels) ) {
nkeynes@736
   327
        channels = 0xF0; // implies everything
nkeynes@644
   328
    }
nkeynes@644
   329
nkeynes@644
   330
    read_len = 0;
nkeynes@644
   331
    int start, size;
nkeynes@644
   332
    switch( track->mode ) {
nkeynes@644
   333
    case GDROM_CDDA:
nkeynes@736
   334
        // audio is nice and simple (assume perfect reads for now)
nkeynes@736
   335
        *length = 2352;
nkeynes@736
   336
        gdrom_read_block( buf, file_offset, track->sector_size, f );
nkeynes@736
   337
        return PKT_ERR_OK;
nkeynes@644
   338
    case GDROM_RAW_XA:
nkeynes@644
   339
    case GDROM_RAW_NONXA:
nkeynes@736
   340
        gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@736
   341
        gdrom_read_block( buf, file_offset+start, size, f );
nkeynes@736
   342
        read_len = size;
nkeynes@736
   343
        break;
nkeynes@644
   344
    case GDROM_SEMIRAW_MODE2:
nkeynes@736
   345
        gdrom_get_read_bounds( sector_mode, channels, &start, &size );
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
            size -= SECTOR_HEADER_SIZE;
nkeynes@736
   350
        } else {
nkeynes@736
   351
            start -= SECTOR_HEADER_SIZE;
nkeynes@736
   352
        }
nkeynes@736
   353
        gdrom_read_block( buf + read_len, file_offset+start, size, f );
nkeynes@736
   354
        read_len += size;
nkeynes@736
   355
        break;
nkeynes@644
   356
    default: // Data track w/ data only in file
nkeynes@736
   357
        if( READ_CD_RAW(channels) ) {
nkeynes@736
   358
            gdrom_read_block( buf + gdrom_data_offset[track->mode], file_offset, 
nkeynes@736
   359
                    track->sector_size, f );
nkeynes@736
   360
            do_encode_L2( buf, sector_mode, lba );
nkeynes@736
   361
            read_len = 2352;
nkeynes@736
   362
        } else {
nkeynes@736
   363
            if( READ_CD_HEADER(channels) ) {
nkeynes@736
   364
                gdrom_build_sector_header( buf, lba, sector_mode );
nkeynes@736
   365
                read_len += SECTOR_HEADER_SIZE;
nkeynes@736
   366
            }
nkeynes@736
   367
            if( READ_CD_SUBHEAD(channels) && 
nkeynes@736
   368
                    (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
nkeynes@736
   369
                if( sector_mode == GDROM_MODE2_FORM1 ) {
nkeynes@736
   370
                    *((uint32_t *)(buf+read_len)) = 0;
nkeynes@736
   371
                    *((uint32_t *)(buf+read_len+4)) = 0;
nkeynes@736
   372
                } else {
nkeynes@736
   373
                    *((uint32_t *)(buf+read_len)) = 0x00200000;
nkeynes@736
   374
                    *((uint32_t *)(buf+read_len+4)) = 0x00200000;
nkeynes@736
   375
                }
nkeynes@736
   376
                read_len += 8;
nkeynes@736
   377
            }
nkeynes@736
   378
            if( READ_CD_DATA(channels) ) {
nkeynes@736
   379
                gdrom_read_block( buf+read_len, file_offset, track->sector_size, f );
nkeynes@736
   380
                read_len += track->sector_size;
nkeynes@736
   381
            }
nkeynes@736
   382
        }
nkeynes@644
   383
    }
nkeynes@342
   384
    *length = read_len;
nkeynes@342
   385
    return PKT_ERR_OK;
nkeynes@342
   386
}
nkeynes@342
   387
nkeynes@422
   388
static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf ) 
nkeynes@342
   389
{
nkeynes@342
   390
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   391
    struct gdrom_toc *toc = (struct gdrom_toc *)buf;
nkeynes@342
   392
    int i;
nkeynes@342
   393
nkeynes@342
   394
    for( i=0; i<image->track_count; i++ ) {
nkeynes@736
   395
        toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
nkeynes@342
   396
    }
nkeynes@342
   397
    toc->first = 0x0100 | image->track[0].flags;
nkeynes@342
   398
    toc->last = (image->track_count<<8) | image->track[i-1].flags;
nkeynes@342
   399
    toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
nkeynes@736
   400
    image->track[i-1].flags;
nkeynes@342
   401
    for( ;i<99; i++ )
nkeynes@736
   402
        toc->track[i] = 0xFFFFFFFF;
nkeynes@342
   403
    return PKT_ERR_OK;
nkeynes@342
   404
}
nkeynes@342
   405
nkeynes@422
   406
static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf )
nkeynes@342
   407
{
nkeynes@342
   408
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   409
    struct gdrom_track *last_track = &image->track[image->track_count-1];
nkeynes@342
   410
    unsigned int end_of_disc = last_track->lba + last_track->sector_count;
nkeynes@342
   411
    int i;
nkeynes@342
   412
    buf[0] = 0x01; /* Disc status? */
nkeynes@342
   413
    buf[1] = 0;
nkeynes@342
   414
nkeynes@342
   415
    if( session == 0 ) {
nkeynes@736
   416
        buf[2] = last_track->session+1; /* last session */
nkeynes@736
   417
        buf[3] = (end_of_disc >> 16) & 0xFF;
nkeynes@736
   418
        buf[4] = (end_of_disc >> 8) & 0xFF;
nkeynes@736
   419
        buf[5] = end_of_disc & 0xFF;
nkeynes@736
   420
        return PKT_ERR_OK;
nkeynes@342
   421
    } else {
nkeynes@736
   422
        session--;
nkeynes@736
   423
        for( i=0; i<image->track_count; i++ ) {
nkeynes@736
   424
            if( image->track[i].session == session ) {
nkeynes@736
   425
                buf[2] = i+1; /* first track of session */
nkeynes@736
   426
                buf[3] = (image->track[i].lba >> 16) & 0xFF;
nkeynes@736
   427
                buf[4] = (image->track[i].lba >> 8) & 0xFF;
nkeynes@736
   428
                buf[5] = image->track[i].lba & 0xFF;
nkeynes@736
   429
                return PKT_ERR_OK;
nkeynes@736
   430
            }
nkeynes@736
   431
        }
nkeynes@736
   432
        return PKT_ERR_BADFIELD; /* No such session */
nkeynes@342
   433
    }
nkeynes@342
   434
}
nkeynes@342
   435
nkeynes@422
   436
static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf )
nkeynes@342
   437
{
nkeynes@342
   438
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   439
    int track_no = gdrom_image_get_track_by_lba( image, lba );
nkeynes@342
   440
    if( track_no == -1 ) {
nkeynes@736
   441
        track_no = 1;
nkeynes@736
   442
        lba = 150;
nkeynes@342
   443
    }
nkeynes@342
   444
    struct gdrom_track *track = &image->track[track_no-1];
nkeynes@342
   445
    uint32_t offset = lba - track->lba;
nkeynes@342
   446
    buf[4] = track->flags;
nkeynes@342
   447
    buf[5] = track_no;
nkeynes@342
   448
    buf[6] = 0x01; /* ?? */
nkeynes@342
   449
    buf[7] = (offset >> 16) & 0xFF;
nkeynes@342
   450
    buf[8] = (offset >> 8) & 0xFF;
nkeynes@342
   451
    buf[9] = offset & 0xFF;
nkeynes@342
   452
    buf[10] = 0;
nkeynes@342
   453
    buf[11] = (lba >> 16) & 0xFF;
nkeynes@342
   454
    buf[12] = (lba >> 8) & 0xFF;
nkeynes@342
   455
    buf[13] = lba & 0xFF;
nkeynes@422
   456
    return PKT_ERR_OK;
nkeynes@342
   457
}
nkeynes@342
   458
nkeynes@342
   459
static int gdrom_image_drive_status( gdrom_disc_t disc ) 
nkeynes@342
   460
{
nkeynes@342
   461
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@720
   462
    if( image->disc_type == IDE_DISC_NONE ) {
nkeynes@720
   463
        return IDE_DISC_NONE;
nkeynes@720
   464
    } else {
nkeynes@720
   465
        return image->disc_type | IDE_DISC_READY;
nkeynes@720
   466
    }
nkeynes@342
   467
}
nkeynes@342
   468
nkeynes@342
   469
void gdrom_image_dump_info( gdrom_disc_t d ) {
nkeynes@342
   470
    gdrom_image_t disc = (gdrom_image_t)d;
nkeynes@342
   471
    int i;
nkeynes@342
   472
    int last_session = disc->track[disc->track_count-1].session;
nkeynes@342
   473
    gboolean is_bootable = FALSE;
nkeynes@342
   474
nkeynes@342
   475
    INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, 
nkeynes@736
   476
          disc->track[disc->track_count-1].session + 1 );
nkeynes@342
   477
    if( last_session > 0 ) {
nkeynes@736
   478
        /* Boot track is the first data track of the last session, provided that it 
nkeynes@736
   479
         * cannot be a single-session disc.
nkeynes@736
   480
         */
nkeynes@736
   481
        int boot_track = -1;
nkeynes@736
   482
        for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
nkeynes@736
   483
            if( disc->track[i].flags & TRACK_DATA ) {
nkeynes@736
   484
                boot_track = i;
nkeynes@736
   485
            }
nkeynes@736
   486
        }
nkeynes@736
   487
        if( boot_track != -1 ) {
nkeynes@736
   488
            unsigned char boot_sector[MAX_SECTOR_SIZE];
nkeynes@736
   489
            uint32_t length = sizeof(boot_sector);
nkeynes@736
   490
            if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
nkeynes@736
   491
                    boot_sector, &length ) == PKT_ERR_OK ) {
nkeynes@736
   492
                bootstrap_dump(boot_sector, FALSE);
nkeynes@736
   493
                is_bootable = TRUE;
nkeynes@736
   494
            }
nkeynes@736
   495
        }
nkeynes@342
   496
    }
nkeynes@342
   497
    if( !is_bootable ) {
nkeynes@736
   498
        WARN( "Disc does not appear to be bootable" );
nkeynes@342
   499
    }
nkeynes@342
   500
}
nkeynes@342
   501
nkeynes@709
   502
gdrom_device_t gdrom_device_new( const gchar *name, const gchar *dev_name )
nkeynes@709
   503
{
nkeynes@709
   504
    struct gdrom_device *dev = g_malloc0( sizeof(struct gdrom_device) );
nkeynes@709
   505
    dev->name = g_strdup(name);
nkeynes@709
   506
    dev->device_name = g_strdup(dev_name);
nkeynes@709
   507
    return dev;
nkeynes@709
   508
}
nkeynes@709
   509
nkeynes@709
   510
void gdrom_device_destroy( gdrom_device_t dev )
nkeynes@709
   511
{
nkeynes@709
   512
    if( dev->name != NULL ) {
nkeynes@709
   513
        g_free( dev->name );
nkeynes@709
   514
        dev->name = NULL;
nkeynes@709
   515
    }
nkeynes@709
   516
    if( dev->device_name != NULL ) {
nkeynes@709
   517
        g_free( dev->device_name );
nkeynes@709
   518
        dev->device_name = NULL;
nkeynes@709
   519
    }
nkeynes@709
   520
    g_free( dev );
nkeynes@709
   521
}
.