1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/gdrom/gdimage.c	Sat Sep 08 04:38:38 2007 +0000
     1.3 @@ -0,0 +1,233 @@
     1.4 +/**
     1.5 + * $Id: gdimage.c,v 1.1 2007-01-31 10:58:42 nkeynes Exp $
     1.6 + *
     1.7 + * GD-Rom image-file common 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 "gdrom/gdrom.h"
    1.23 +#include "gdrom/packet.h"
    1.24 +
    1.25 +static void gdrom_image_destroy( gdrom_disc_t disc );
    1.26 +static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode, 
    1.27 +					      char *buf, uint32_t *readlength );
    1.28 +static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, char *buf );
    1.29 +static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, char *buf );
    1.30 +static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, char *buf );
    1.31 +static int gdrom_image_drive_status( gdrom_disc_t disc );
    1.32 +
    1.33 +
    1.34 +/**
    1.35 + * Initialize a gdrom_disc structure with the gdrom_image_* methods
    1.36 + */
    1.37 +void gdrom_image_init( gdrom_disc_t disc )
    1.38 +{
    1.39 +    memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
    1.40 +    disc->read_sector = gdrom_image_read_sector;
    1.41 +    disc->read_toc = gdrom_image_read_toc;
    1.42 +    disc->read_session = gdrom_image_read_session;
    1.43 +    disc->read_position = gdrom_image_read_position;
    1.44 +    disc->drive_status = gdrom_image_drive_status;
    1.45 +    disc->play_audio = NULL; /* not supported yet */
    1.46 +    disc->run_time_slice = NULL; /* not needed */
    1.47 +    disc->close = gdrom_image_destroy;
    1.48 +}
    1.49 +
    1.50 +gdrom_disc_t gdrom_image_new( FILE *f )
    1.51 +{
    1.52 +    gdrom_image_t image = (gdrom_image_t)calloc(sizeof(struct gdrom_image), 1);
    1.53 +    if( image == NULL ) {
    1.54 +	return NULL;
    1.55 +    }
    1.56 +    image->disc_type = IDE_DISC_CDROM;
    1.57 +    image->file = f;
    1.58 +
    1.59 +    gdrom_disc_t disc = (gdrom_disc_t)image;
    1.60 +    gdrom_image_init(disc);
    1.61 +    return disc;
    1.62 +}
    1.63 +
    1.64 +static void gdrom_image_destroy( gdrom_disc_t disc )
    1.65 +{
    1.66 +    gdrom_image_t img = (gdrom_image_t)disc;
    1.67 +    if( img->file != NULL ) {
    1.68 +	fclose(img->file);
    1.69 +	img->file = NULL;
    1.70 +    }
    1.71 +    free( disc );
    1.72 +}
    1.73 +
    1.74 +static int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
    1.75 +{
    1.76 +    int i;
    1.77 +    for( i=0; i<image->track_count; i++ ) {
    1.78 +	if( image->track[i].lba <= lba && 
    1.79 +	    lba < (image->track[i].lba + image->track[i].sector_count) ) {
    1.80 +	    return i+1;
    1.81 +	}
    1.82 +    }
    1.83 +    return -1;
    1.84 +}
    1.85 +
    1.86 +static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
    1.87 +					      int mode, char *buf, uint32_t *length )
    1.88 +{
    1.89 +    gdrom_image_t image = (gdrom_image_t)disc;
    1.90 +    int i, file_offset, read_len, track_no;
    1.91 +
    1.92 +    track_no = gdrom_image_get_track_by_lba( image, lba );
    1.93 +    if( track_no == -1 ) {
    1.94 +	return PKT_ERR_BADREAD;
    1.95 +    }
    1.96 +    struct gdrom_track *track = &image->track[track_no-1];
    1.97 +    file_offset = track->offset + track->sector_size * (lba - track->lba);
    1.98 +    read_len = track->sector_size;
    1.99 +
   1.100 +    switch( mode ) {
   1.101 +    case 0x24:
   1.102 +    case 0x28:
   1.103 +	switch( track->mode ) {
   1.104 +	case GDROM_MODE1:
   1.105 +	case GDROM_MODE2_XA1:
   1.106 +	    fseek( image->file, file_offset, SEEK_SET );
   1.107 +	    fread( buf, track->sector_size, 1, image->file );
   1.108 +	    break;
   1.109 +	case GDROM_MODE2:
   1.110 +	    read_len = 2048;
   1.111 +	    file_offset += 8; /* skip the subheader */
   1.112 +	    fseek( image->file, file_offset, SEEK_SET );
   1.113 +	    fread( buf, 2048, 1, image->file );
   1.114 +	    break;
   1.115 +	default:
   1.116 +	    return PKT_ERR_BADREADMODE;
   1.117 +	}
   1.118 +	break;
   1.119 +    default:
   1.120 +	return PKT_ERR_BADREADMODE;
   1.121 +    }
   1.122 +	    
   1.123 +    *length = read_len;
   1.124 +    return PKT_ERR_OK;
   1.125 +
   1.126 +}
   1.127 +
   1.128 +static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, char *buf ) 
   1.129 +{
   1.130 +    gdrom_image_t image = (gdrom_image_t)disc;
   1.131 +    struct gdrom_toc *toc = (struct gdrom_toc *)buf;
   1.132 +    int i;
   1.133 +
   1.134 +    for( i=0; i<image->track_count; i++ ) {
   1.135 +	toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
   1.136 +    }
   1.137 +    toc->first = 0x0100 | image->track[0].flags;
   1.138 +    toc->last = (image->track_count<<8) | image->track[i-1].flags;
   1.139 +    toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
   1.140 +	image->track[i-1].flags;
   1.141 +    for( ;i<99; i++ )
   1.142 +	toc->track[i] = 0xFFFFFFFF;
   1.143 +    return PKT_ERR_OK;
   1.144 +}
   1.145 +
   1.146 +static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, char *buf )
   1.147 +{
   1.148 +    gdrom_image_t image = (gdrom_image_t)disc;
   1.149 +    struct gdrom_track *last_track = &image->track[image->track_count-1];
   1.150 +    unsigned int end_of_disc = last_track->lba + last_track->sector_count;
   1.151 +    int i;
   1.152 +    buf[0] = 0x01; /* Disc status? */
   1.153 +    buf[1] = 0;
   1.154 +
   1.155 +    if( session == 0 ) {
   1.156 +	buf[2] = last_track->session+1; /* last session */
   1.157 +	buf[3] = (end_of_disc >> 16) & 0xFF;
   1.158 +	buf[4] = (end_of_disc >> 8) & 0xFF;
   1.159 +	buf[5] = end_of_disc & 0xFF;
   1.160 +	return PKT_ERR_OK;
   1.161 +    } else {
   1.162 +	session--;
   1.163 +	for( i=0; i<image->track_count; i++ ) {
   1.164 +	    if( image->track[i].session == session ) {
   1.165 +		buf[2] = i+1; /* first track of session */
   1.166 +		buf[3] = (image->track[i].lba >> 16) & 0xFF;
   1.167 +		buf[4] = (image->track[i].lba >> 8) & 0xFF;
   1.168 +		buf[5] = image->track[i].lba & 0xFF;
   1.169 +		return PKT_ERR_OK;
   1.170 +	    }
   1.171 +	}
   1.172 +	return PKT_ERR_BADFIELD; /* No such session */
   1.173 +    }
   1.174 +}
   1.175 +
   1.176 +static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, char *buf )
   1.177 +{
   1.178 +    gdrom_image_t image = (gdrom_image_t)disc;
   1.179 +    int track_no = gdrom_image_get_track_by_lba( image, lba );
   1.180 +    if( track_no == -1 ) {
   1.181 +	track_no = 1;
   1.182 +	lba = 150;
   1.183 +    }
   1.184 +    struct gdrom_track *track = &image->track[track_no-1];
   1.185 +    uint32_t offset = lba - track->lba;
   1.186 +    buf[4] = track->flags;
   1.187 +    buf[5] = track_no;
   1.188 +    buf[6] = 0x01; /* ?? */
   1.189 +    buf[7] = (offset >> 16) & 0xFF;
   1.190 +    buf[8] = (offset >> 8) & 0xFF;
   1.191 +    buf[9] = offset & 0xFF;
   1.192 +    buf[10] = 0;
   1.193 +    buf[11] = (lba >> 16) & 0xFF;
   1.194 +    buf[12] = (lba >> 8) & 0xFF;
   1.195 +    buf[13] = lba & 0xFF;
   1.196 +}
   1.197 +
   1.198 +static int gdrom_image_drive_status( gdrom_disc_t disc ) 
   1.199 +{
   1.200 +    gdrom_image_t image = (gdrom_image_t)disc;
   1.201 +    return image->disc_type | IDE_DISC_READY;
   1.202 +}
   1.203 +
   1.204 +void gdrom_image_dump_info( gdrom_disc_t d ) {
   1.205 +    gdrom_image_t disc = (gdrom_image_t)d;
   1.206 +    int i;
   1.207 +    int last_session = disc->track[disc->track_count-1].session;
   1.208 +    gboolean is_bootable = FALSE;
   1.209 +
   1.210 +    INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, 
   1.211 +	  disc->track[disc->track_count-1].session + 1 );
   1.212 +    if( last_session > 0 ) {
   1.213 +	/* Boot track is the first data track of the last session, provided that it 
   1.214 +	 * cannot be a single-session disc.
   1.215 +	 */
   1.216 +	int boot_track = -1;
   1.217 +	for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
   1.218 +	    if( disc->track[i].flags & TRACK_DATA ) {
   1.219 +		boot_track = i;
   1.220 +	    }
   1.221 +	}
   1.222 +	if( boot_track != -1 ) {
   1.223 +	    char boot_sector[MAX_SECTOR_SIZE];
   1.224 +	    uint32_t length = sizeof(boot_sector);
   1.225 +	    if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
   1.226 +				   boot_sector, &length ) == PKT_ERR_OK ) {
   1.227 +		bootstrap_dump(boot_sector, FALSE);
   1.228 +		is_bootable = TRUE;
   1.229 +	    }
   1.230 +	}
   1.231 +    }
   1.232 +    if( !is_bootable ) {
   1.233 +	WARN( "Disc does not appear to be bootable" );
   1.234 +    }
   1.235 +}
   1.236 +