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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 342:850502f0e8de
next422:61a0598e07ff
author nkeynes
date Wed Jan 31 10:58:42 2007 +0000 (15 years ago)
permissions -rw-r--r--
last change Refactor gdrom module to be more conducive to real device support
file annotate diff log raw
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/**
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 * $Id: gdimage.c,v 1.1 2007-01-31 10:58:42 nkeynes Exp $
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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 "gdrom/gdrom.h"
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#include "gdrom/packet.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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					      char *buf, uint32_t *readlength );
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static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, char *buf );
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static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, char *buf );
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static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, char *buf );
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static int gdrom_image_drive_status( gdrom_disc_t disc );
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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( FILE *f )
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{
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    gdrom_image_t image = (gdrom_image_t)calloc(sizeof(struct gdrom_image), 1);
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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_CDROM;
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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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    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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    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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    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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static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
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					      int mode, 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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    int i, file_offset, read_len, track_no;
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    track_no = gdrom_image_get_track_by_lba( image, lba );
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    if( track_no == -1 ) {
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	return PKT_ERR_BADREAD;
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    }
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    struct gdrom_track *track = &image->track[track_no-1];
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    file_offset = track->offset + track->sector_size * (lba - track->lba);
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    read_len = track->sector_size;
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    switch( mode ) {
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    case 0x24:
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    case 0x28:
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	switch( track->mode ) {
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	case GDROM_MODE1:
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	case GDROM_MODE2_XA1:
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	    fseek( image->file, file_offset, SEEK_SET );
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	    fread( buf, track->sector_size, 1, image->file );
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	    break;
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	case GDROM_MODE2:
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	    read_len = 2048;
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	    file_offset += 8; /* skip the subheader */
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	    fseek( image->file, file_offset, SEEK_SET );
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	    fread( buf, 2048, 1, image->file );
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	    break;
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	default:
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	    return PKT_ERR_BADREADMODE;
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	}
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	break;
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    default:
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	return PKT_ERR_BADREADMODE;
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    }
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    *length = read_len;
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    return PKT_ERR_OK;
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}
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static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, char *buf ) 
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{
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    gdrom_image_t image = (gdrom_image_t)disc;
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    struct gdrom_toc *toc = (struct gdrom_toc *)buf;
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    int i;
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    for( i=0; i<image->track_count; i++ ) {
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	toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
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    }
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    toc->first = 0x0100 | image->track[0].flags;
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    toc->last = (image->track_count<<8) | image->track[i-1].flags;
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    toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
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	image->track[i-1].flags;
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    for( ;i<99; i++ )
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	toc->track[i] = 0xFFFFFFFF;
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    return PKT_ERR_OK;
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}
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static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, char *buf )
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{
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    gdrom_image_t image = (gdrom_image_t)disc;
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    struct gdrom_track *last_track = &image->track[image->track_count-1];
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    unsigned int end_of_disc = last_track->lba + last_track->sector_count;
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    int i;
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    buf[0] = 0x01; /* Disc status? */
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    buf[1] = 0;
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    if( session == 0 ) {
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	buf[2] = last_track->session+1; /* last session */
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	buf[3] = (end_of_disc >> 16) & 0xFF;
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	buf[4] = (end_of_disc >> 8) & 0xFF;
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	buf[5] = end_of_disc & 0xFF;
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	return PKT_ERR_OK;
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    } else {
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	session--;
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	for( i=0; i<image->track_count; i++ ) {
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	    if( image->track[i].session == session ) {
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		buf[2] = i+1; /* first track of session */
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		buf[3] = (image->track[i].lba >> 16) & 0xFF;
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		buf[4] = (image->track[i].lba >> 8) & 0xFF;
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		buf[5] = image->track[i].lba & 0xFF;
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		return PKT_ERR_OK;
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	    }
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	}
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	return PKT_ERR_BADFIELD; /* No such session */
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    }
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}
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static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, char *buf )
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{
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    gdrom_image_t image = (gdrom_image_t)disc;
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    int track_no = gdrom_image_get_track_by_lba( image, lba );
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    if( track_no == -1 ) {
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	track_no = 1;
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	lba = 150;
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    }
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    struct gdrom_track *track = &image->track[track_no-1];
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    uint32_t offset = lba - track->lba;
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    buf[4] = track->flags;
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    buf[5] = track_no;
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    buf[6] = 0x01; /* ?? */
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    buf[7] = (offset >> 16) & 0xFF;
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    buf[8] = (offset >> 8) & 0xFF;
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    buf[9] = offset & 0xFF;
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    buf[10] = 0;
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    buf[11] = (lba >> 16) & 0xFF;
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    buf[12] = (lba >> 8) & 0xFF;
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    buf[13] = lba & 0xFF;
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}
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static int gdrom_image_drive_status( gdrom_disc_t disc ) 
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{
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    gdrom_image_t image = (gdrom_image_t)disc;
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    return image->disc_type | IDE_DISC_READY;
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}
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void gdrom_image_dump_info( gdrom_disc_t d ) {
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    gdrom_image_t disc = (gdrom_image_t)d;
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    int i;
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    int last_session = disc->track[disc->track_count-1].session;
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    gboolean is_bootable = FALSE;
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    INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, 
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	  disc->track[disc->track_count-1].session + 1 );
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    if( last_session > 0 ) {
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	/* Boot track is the first data track of the last session, provided that it 
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	 * cannot be a single-session disc.
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	 */
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	int boot_track = -1;
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	for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
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	    if( disc->track[i].flags & TRACK_DATA ) {
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		boot_track = i;
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	    }
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	}
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	if( boot_track != -1 ) {
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	    char boot_sector[MAX_SECTOR_SIZE];
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	    uint32_t length = sizeof(boot_sector);
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	    if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
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				   boot_sector, &length ) == PKT_ERR_OK ) {
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		bootstrap_dump(boot_sector, FALSE);
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		is_bootable = TRUE;
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	    }
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	}
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    }
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    if( !is_bootable ) {
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	WARN( "Disc does not appear to be bootable" );
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    }
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}
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.