nkeynes@342: /**
nkeynes@561:  * $Id$
nkeynes@342:  *
nkeynes@342:  * GD-Rom image-file common functions. 
nkeynes@342:  *
nkeynes@342:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@342:  *
nkeynes@342:  * This program is free software; you can redistribute it and/or modify
nkeynes@342:  * it under the terms of the GNU General Public License as published by
nkeynes@342:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@342:  * (at your option) any later version.
nkeynes@342:  *
nkeynes@342:  * This program is distributed in the hope that it will be useful,
nkeynes@342:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@342:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@342:  * GNU General Public License for more details.
nkeynes@342:  */
nkeynes@342: 
nkeynes@644: #include <assert.h>
nkeynes@759: #include <stdlib.h>
nkeynes@736: #include <string.h>
nkeynes@796: #include <sys/types.h>
nkeynes@422: #include <netinet/in.h>
nkeynes@422: 
nkeynes@678: #include "gdrom/gddriver.h"
nkeynes@342: #include "gdrom/packet.h"
nkeynes@644: #include "ecc.h"
nkeynes@422: #include "bootstrap.h"
nkeynes@342: 
nkeynes@342: static void gdrom_image_destroy( gdrom_disc_t disc );
nkeynes@342: static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode, 
nkeynes@736:                                               unsigned char *buf, uint32_t *readlength );
nkeynes@422: static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf );
nkeynes@422: static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf );
nkeynes@422: static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf );
nkeynes@342: static int gdrom_image_drive_status( gdrom_disc_t disc );
nkeynes@342: 
nkeynes@644: static uint8_t gdrom_default_sync[12] = { 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0 };
nkeynes@644: 
nkeynes@644: #define SECTOR_HEADER_SIZE 16
nkeynes@644: #define SECTOR_SUBHEADER_SIZE 8
nkeynes@644: 
nkeynes@644: /* Data offset (from start of raw sector) by sector mode */
nkeynes@644: static int gdrom_data_offset[] = { 16, 16, 16, 24, 24, 0, 8, 0, 0 };
nkeynes@644: 
nkeynes@644: 
nkeynes@644: 
nkeynes@498: struct cdrom_sector_header {
nkeynes@498:     uint8_t sync[12];
nkeynes@498:     uint8_t msf[3];
nkeynes@498:     uint8_t mode;
nkeynes@644:     uint8_t subhead[8]; // Mode-2 XA sectors only
nkeynes@498: };
nkeynes@342: 
nkeynes@342: /**
nkeynes@342:  * Initialize a gdrom_disc structure with the gdrom_image_* methods
nkeynes@342:  */
nkeynes@342: void gdrom_image_init( gdrom_disc_t disc )
nkeynes@342: {
nkeynes@342:     memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
nkeynes@342:     disc->read_sector = gdrom_image_read_sector;
nkeynes@342:     disc->read_toc = gdrom_image_read_toc;
nkeynes@342:     disc->read_session = gdrom_image_read_session;
nkeynes@342:     disc->read_position = gdrom_image_read_position;
nkeynes@342:     disc->drive_status = gdrom_image_drive_status;
nkeynes@342:     disc->play_audio = NULL; /* not supported yet */
nkeynes@342:     disc->run_time_slice = NULL; /* not needed */
nkeynes@342:     disc->close = gdrom_image_destroy;
nkeynes@342: }
nkeynes@342: 
nkeynes@464: gdrom_disc_t gdrom_image_new( const gchar *filename, FILE *f )
nkeynes@342: {
nkeynes@736:     gdrom_image_t image = (gdrom_image_t)g_malloc0(sizeof(struct gdrom_image));
nkeynes@342:     if( image == NULL ) {
nkeynes@736:         return NULL;
nkeynes@342:     }
nkeynes@644:     image->disc_type = IDE_DISC_CDROMXA;
nkeynes@342:     image->file = f;
nkeynes@342:     gdrom_disc_t disc = (gdrom_disc_t)image;
nkeynes@342:     gdrom_image_init(disc);
nkeynes@464:     if( filename == NULL ) {
nkeynes@736:         disc->name = NULL;
nkeynes@464:     } else {
nkeynes@736:         disc->name = g_strdup(filename);
nkeynes@464:     }
nkeynes@464: 
nkeynes@342:     return disc;
nkeynes@342: }
nkeynes@342: 
nkeynes@342: static void gdrom_image_destroy( gdrom_disc_t disc )
nkeynes@342: {
nkeynes@492:     int i;
nkeynes@492:     FILE *lastfile = NULL;
nkeynes@342:     gdrom_image_t img = (gdrom_image_t)disc;
nkeynes@342:     if( img->file != NULL ) {
nkeynes@736:         fclose(img->file);
nkeynes@736:         img->file = NULL;
nkeynes@342:     }
nkeynes@492:     for( i=0; i<img->track_count; i++ ) {
nkeynes@736:         if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
nkeynes@736:             lastfile = img->track[i].file;
nkeynes@736:             fclose(lastfile);
nkeynes@736:             img->track[i].file = NULL;
nkeynes@736:         }
nkeynes@492:     }
nkeynes@464:     if( disc->name != NULL ) {
nkeynes@736:         g_free( (gpointer)disc->name );
nkeynes@736:         disc->name = NULL;
nkeynes@464:     }
nkeynes@342:     free( disc );
nkeynes@342: }
nkeynes@342: 
nkeynes@468: void gdrom_image_destroy_no_close( gdrom_disc_t disc )
nkeynes@468: {
nkeynes@492:     int i;
nkeynes@492:     FILE *lastfile = NULL;
nkeynes@468:     gdrom_image_t img = (gdrom_image_t)disc;
nkeynes@468:     if( img->file != NULL ) {
nkeynes@736:         img->file = NULL;
nkeynes@468:     }
nkeynes@492:     for( i=0; i<img->track_count; i++ ) {
nkeynes@736:         if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
nkeynes@736:             lastfile = img->track[i].file;
nkeynes@736:             fclose(lastfile);
nkeynes@736:             img->track[i].file = NULL;
nkeynes@736:         }
nkeynes@492:     }
nkeynes@468:     if( disc->name != NULL ) {
nkeynes@736:         g_free( (gpointer)disc->name );
nkeynes@736:         disc->name = NULL;
nkeynes@468:     }
nkeynes@468:     free( disc );
nkeynes@468: }
nkeynes@468: 
nkeynes@782: int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
nkeynes@342: {
nkeynes@342:     int i;
nkeynes@342:     for( i=0; i<image->track_count; i++ ) {
nkeynes@736:         if( image->track[i].lba <= lba && 
nkeynes@736:                 lba < (image->track[i].lba + image->track[i].sector_count) ) {
nkeynes@736:             return i+1;
nkeynes@736:         }
nkeynes@342:     }
nkeynes@342:     return -1;
nkeynes@342: }
nkeynes@342: 
nkeynes@492: /**
nkeynes@492:  * Read a block from an image file, handling negative file offsets
nkeynes@492:  * with 0-fill.
nkeynes@492:  */
nkeynes@644: static gboolean gdrom_read_block( unsigned char *buf, int file_offset, int length, FILE *f )
nkeynes@492: {
nkeynes@492:     if( file_offset < 0 ) {
nkeynes@736:         int size = -file_offset;
nkeynes@736:         if( size >= length ) {
nkeynes@736:             memset( buf, 0, length );
nkeynes@736:             return TRUE;
nkeynes@736:         } else {
nkeynes@736:             memset( buf, 0, size );
nkeynes@736:             file_offset = 0;
nkeynes@736:             length -= size;
nkeynes@736:         }
nkeynes@492:     }
nkeynes@492:     fseek( f, file_offset, SEEK_SET );
nkeynes@644:     return fread( buf, length, 1, f ) == 1;
nkeynes@492: }
nkeynes@492: 
nkeynes@644: static void gdrom_build_sector_header( unsigned char *buf, uint32_t lba, 
nkeynes@736:                                        gdrom_track_mode_t sector_mode )
nkeynes@644: {
nkeynes@644:     memcpy( buf, gdrom_default_sync, 12 );
nkeynes@644:     cd_build_address( buf, sector_mode, lba );
nkeynes@644: }
nkeynes@644: 
nkeynes@644: /**
nkeynes@644:  * Return TRUE if the given read mode + track modes are compatible,
nkeynes@644:  * otherwise FALSE.
nkeynes@644:  * @param track_mode one of the GDROM_MODE* constants
nkeynes@644:  * @param read_mode the READ_CD_MODE from the read request
nkeynes@644:  */
nkeynes@644: static gboolean gdrom_is_compatible_read_mode( int track_mode, int read_mode )
nkeynes@644: {
nkeynes@644:     switch( read_mode ) {
nkeynes@644:     case READ_CD_MODE_ANY:
nkeynes@736:         return TRUE;
nkeynes@644:     case READ_CD_MODE_CDDA:
nkeynes@736:         return track_mode == GDROM_CDDA;
nkeynes@644:     case READ_CD_MODE_1:
nkeynes@736:         return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1;
nkeynes@644:     case READ_CD_MODE_2_FORM_1:
nkeynes@736:         return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1;
nkeynes@644:     case READ_CD_MODE_2_FORM_2:
nkeynes@736:         return track_mode == GDROM_MODE2_FORM2;
nkeynes@644:     case READ_CD_MODE_2:
nkeynes@736:         return track_mode == GDROM_MODE2_FORMLESS;
nkeynes@644:     default:
nkeynes@736:         return FALSE;
nkeynes@644:     }
nkeynes@644: }
nkeynes@644: 
nkeynes@644: /**
nkeynes@644:  * Determine the start position in a raw sector, and the amount of data to read
nkeynes@644:  * in bytes, for a given combination of sector mode and read mode.
nkeynes@644:  */ 
nkeynes@644: static void gdrom_get_read_bounds( int sector_mode, int read_mode, int *start, int *size )
nkeynes@644: {
nkeynes@644:     if( READ_CD_RAW(read_mode) ) {
nkeynes@736:         // whole sector
nkeynes@736:         *start = 0;
nkeynes@736:         *size = 2352;
nkeynes@644:     } else {
nkeynes@736:         *size = 0;
nkeynes@736:         if( READ_CD_DATA(read_mode) ) {
nkeynes@736:             *start = gdrom_data_offset[sector_mode];
nkeynes@736:             *size = gdrom_sector_size[sector_mode];
nkeynes@736:         }
nkeynes@644: 
nkeynes@736:         if( READ_CD_SUBHEAD(read_mode) && 
nkeynes@736:                 (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
nkeynes@736:             *start = SECTOR_HEADER_SIZE;
nkeynes@736:             *size += SECTOR_SUBHEADER_SIZE;
nkeynes@736:         }
nkeynes@644: 
nkeynes@736:         if( READ_CD_HEADER(read_mode) ) {
nkeynes@736:             *size += SECTOR_HEADER_SIZE;
nkeynes@736:             *start = 0;
nkeynes@736:         }
nkeynes@644: 
nkeynes@644:     }
nkeynes@644: }
nkeynes@644: 
nkeynes@782: void gdrom_extract_raw_data_sector( char *sector_data, int channels, unsigned char *buf, uint32_t *length )
nkeynes@782: {
nkeynes@782:     int sector_mode;
nkeynes@782:     int start, size;
nkeynes@782:     struct cdrom_sector_header *secthead = (struct cdrom_sector_header *)sector_data;
nkeynes@782:     if( secthead->mode == 1 ) {
nkeynes@782:         sector_mode = GDROM_MODE1;
nkeynes@782:     } else {
nkeynes@782:         sector_mode = ((secthead->subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
nkeynes@782:     }
nkeynes@782:     gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@782:     
nkeynes@782:     memcpy( buf, sector_data+start, size );
nkeynes@782:     *length = size;
nkeynes@782: }
nkeynes@782: 
nkeynes@644: /**
nkeynes@644:  * Read a single sector from a disc image. If you thought this would be simple, 
nkeynes@644:  * I have just one thing to say to you: Bwahahahahahahahah.
nkeynes@644:  *
nkeynes@644:  * Once we've decided that there's a real sector at the requested lba, there's 
nkeynes@644:  * really two things we need to care about:
nkeynes@644:  *   1. Is the sector mode compatible with the requested read mode
nkeynes@644:  *   2. Which parts of the sector do we need to return? 
nkeynes@644:  *      (header/subhead/data/raw sector)
nkeynes@644:  *
nkeynes@644:  * Also note that the disc image may supply us with just the data (most common 
nkeynes@644:  * case), or may have the full raw sector. In the former case we may need to 
nkeynes@644:  * generate the missing data on the fly, for which we use libedc to compute the
nkeynes@644:  * data correction codes.
nkeynes@644:  */
nkeynes@342: static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
nkeynes@736:                                               int mode, unsigned char *buf, uint32_t *length )
nkeynes@342: {
nkeynes@342:     gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@498:     struct cdrom_sector_header secthead;
nkeynes@422:     int file_offset, read_len, track_no;
nkeynes@498: 
nkeynes@492:     FILE *f;
nkeynes@342: 
nkeynes@342:     track_no = gdrom_image_get_track_by_lba( image, lba );
nkeynes@342:     if( track_no == -1 ) {
nkeynes@736:         return PKT_ERR_BADREAD;
nkeynes@342:     }
nkeynes@342:     struct gdrom_track *track = &image->track[track_no-1];
nkeynes@342:     file_offset = track->offset + track->sector_size * (lba - track->lba);
nkeynes@342:     read_len = track->sector_size;
nkeynes@492:     if( track->file != NULL ) {
nkeynes@736:         f = track->file;
nkeynes@492:     } else {
nkeynes@736:         f = image->file;
nkeynes@492:     }
nkeynes@492: 
nkeynes@644:     /* First figure out what the real sector mode is for raw/semiraw sectors */
nkeynes@644:     int sector_mode;
nkeynes@644:     switch( track->mode ) {
nkeynes@644:     case GDROM_RAW_NONXA:
nkeynes@736:         gdrom_read_block( (unsigned char *)(&secthead), file_offset, sizeof(secthead), f );
nkeynes@736:         sector_mode = (secthead.mode == 1) ? GDROM_MODE1 : GDROM_MODE2_FORMLESS;
nkeynes@736:         break;
nkeynes@644:     case GDROM_RAW_XA:
nkeynes@736:         gdrom_read_block( (unsigned char *)(&secthead), file_offset, sizeof(secthead), f );
nkeynes@736:         if( secthead.mode == 1 ) {
nkeynes@736:             sector_mode = GDROM_MODE1;
nkeynes@736:         } else {
nkeynes@736:             sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
nkeynes@736:         }
nkeynes@736:         break;
nkeynes@644:     case GDROM_SEMIRAW_MODE2:
nkeynes@736:         gdrom_read_block( secthead.subhead, file_offset, 8, f );
nkeynes@736:         sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
nkeynes@736:         break;
nkeynes@342:     default:
nkeynes@736:         /* In the other cases, the track mode completely defines the sector mode */
nkeynes@736:         sector_mode = track->mode;
nkeynes@736:         break;
nkeynes@644:     }
nkeynes@644: 
nkeynes@644:     if( !gdrom_is_compatible_read_mode(sector_mode, READ_CD_MODE(mode)) ) {
nkeynes@736:         return PKT_ERR_BADREADMODE;
nkeynes@342:     }
nkeynes@644: 
nkeynes@644:     /* Ok, we've got a valid sector, check what parts of the sector we need to
nkeynes@644:      * return - header | subhead | data | everything
nkeynes@644:      */
nkeynes@644:     int channels = READ_CD_CHANNELS(mode);
nkeynes@644: 
nkeynes@644:     if( channels == 0 ) {
nkeynes@736:         // legal, if weird
nkeynes@736:         *length = 0;
nkeynes@736:         return PKT_ERR_OK;
nkeynes@644:     } else if( channels == 0xA0 && 
nkeynes@736:             (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2 )) {
nkeynes@736:         // caller requested a non-contiguous region
nkeynes@736:         return PKT_ERR_BADFIELD;
nkeynes@644:     } else if( READ_CD_RAW(channels) ) {
nkeynes@736:         channels = 0xF0; // implies everything
nkeynes@644:     }
nkeynes@644: 
nkeynes@644:     read_len = 0;
nkeynes@644:     int start, size;
nkeynes@644:     switch( track->mode ) {
nkeynes@644:     case GDROM_CDDA:
nkeynes@736:         // audio is nice and simple (assume perfect reads for now)
nkeynes@736:         *length = 2352;
nkeynes@736:         gdrom_read_block( buf, file_offset, track->sector_size, f );
nkeynes@736:         return PKT_ERR_OK;
nkeynes@644:     case GDROM_RAW_XA:
nkeynes@644:     case GDROM_RAW_NONXA:
nkeynes@736:         gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@736:         gdrom_read_block( buf, file_offset+start, size, f );
nkeynes@736:         read_len = size;
nkeynes@736:         break;
nkeynes@644:     case GDROM_SEMIRAW_MODE2:
nkeynes@736:         gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@736:         if( READ_CD_HEADER(channels) ) {
nkeynes@736:             gdrom_build_sector_header( buf, lba, sector_mode );
nkeynes@736:             read_len += SECTOR_HEADER_SIZE;
nkeynes@736:             size -= SECTOR_HEADER_SIZE;
nkeynes@736:         } else {
nkeynes@736:             start -= SECTOR_HEADER_SIZE;
nkeynes@736:         }
nkeynes@736:         gdrom_read_block( buf + read_len, file_offset+start, size, f );
nkeynes@736:         read_len += size;
nkeynes@736:         break;
nkeynes@644:     default: // Data track w/ data only in file
nkeynes@736:         if( READ_CD_RAW(channels) ) {
nkeynes@736:             gdrom_read_block( buf + gdrom_data_offset[track->mode], file_offset, 
nkeynes@736:                     track->sector_size, f );
nkeynes@736:             do_encode_L2( buf, sector_mode, lba );
nkeynes@736:             read_len = 2352;
nkeynes@736:         } else {
nkeynes@736:             if( READ_CD_HEADER(channels) ) {
nkeynes@736:                 gdrom_build_sector_header( buf, lba, sector_mode );
nkeynes@736:                 read_len += SECTOR_HEADER_SIZE;
nkeynes@736:             }
nkeynes@736:             if( READ_CD_SUBHEAD(channels) && 
nkeynes@736:                     (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
nkeynes@736:                 if( sector_mode == GDROM_MODE2_FORM1 ) {
nkeynes@736:                     *((uint32_t *)(buf+read_len)) = 0;
nkeynes@736:                     *((uint32_t *)(buf+read_len+4)) = 0;
nkeynes@736:                 } else {
nkeynes@736:                     *((uint32_t *)(buf+read_len)) = 0x00200000;
nkeynes@736:                     *((uint32_t *)(buf+read_len+4)) = 0x00200000;
nkeynes@736:                 }
nkeynes@736:                 read_len += 8;
nkeynes@736:             }
nkeynes@736:             if( READ_CD_DATA(channels) ) {
nkeynes@736:                 gdrom_read_block( buf+read_len, file_offset, track->sector_size, f );
nkeynes@736:                 read_len += track->sector_size;
nkeynes@736:             }
nkeynes@736:         }
nkeynes@644:     }
nkeynes@342:     *length = read_len;
nkeynes@342:     return PKT_ERR_OK;
nkeynes@342: }
nkeynes@342: 
nkeynes@422: static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf ) 
nkeynes@342: {
nkeynes@342:     gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342:     struct gdrom_toc *toc = (struct gdrom_toc *)buf;
nkeynes@342:     int i;
nkeynes@342: 
nkeynes@342:     for( i=0; i<image->track_count; i++ ) {
nkeynes@736:         toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
nkeynes@342:     }
nkeynes@342:     toc->first = 0x0100 | image->track[0].flags;
nkeynes@342:     toc->last = (image->track_count<<8) | image->track[i-1].flags;
nkeynes@342:     toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
nkeynes@736:     image->track[i-1].flags;
nkeynes@342:     for( ;i<99; i++ )
nkeynes@736:         toc->track[i] = 0xFFFFFFFF;
nkeynes@342:     return PKT_ERR_OK;
nkeynes@342: }
nkeynes@342: 
nkeynes@422: static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf )
nkeynes@342: {
nkeynes@342:     gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342:     struct gdrom_track *last_track = &image->track[image->track_count-1];
nkeynes@342:     unsigned int end_of_disc = last_track->lba + last_track->sector_count;
nkeynes@342:     int i;
nkeynes@342:     buf[0] = 0x01; /* Disc status? */
nkeynes@342:     buf[1] = 0;
nkeynes@342: 
nkeynes@342:     if( session == 0 ) {
nkeynes@736:         buf[2] = last_track->session+1; /* last session */
nkeynes@736:         buf[3] = (end_of_disc >> 16) & 0xFF;
nkeynes@736:         buf[4] = (end_of_disc >> 8) & 0xFF;
nkeynes@736:         buf[5] = end_of_disc & 0xFF;
nkeynes@736:         return PKT_ERR_OK;
nkeynes@342:     } else {
nkeynes@736:         session--;
nkeynes@736:         for( i=0; i<image->track_count; i++ ) {
nkeynes@736:             if( image->track[i].session == session ) {
nkeynes@736:                 buf[2] = i+1; /* first track of session */
nkeynes@736:                 buf[3] = (image->track[i].lba >> 16) & 0xFF;
nkeynes@736:                 buf[4] = (image->track[i].lba >> 8) & 0xFF;
nkeynes@736:                 buf[5] = image->track[i].lba & 0xFF;
nkeynes@736:                 return PKT_ERR_OK;
nkeynes@736:             }
nkeynes@736:         }
nkeynes@736:         return PKT_ERR_BADFIELD; /* No such session */
nkeynes@342:     }
nkeynes@342: }
nkeynes@342: 
nkeynes@422: static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf )
nkeynes@342: {
nkeynes@342:     gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342:     int track_no = gdrom_image_get_track_by_lba( image, lba );
nkeynes@342:     if( track_no == -1 ) {
nkeynes@736:         track_no = 1;
nkeynes@736:         lba = 150;
nkeynes@342:     }
nkeynes@342:     struct gdrom_track *track = &image->track[track_no-1];
nkeynes@342:     uint32_t offset = lba - track->lba;
nkeynes@342:     buf[4] = track->flags;
nkeynes@342:     buf[5] = track_no;
nkeynes@342:     buf[6] = 0x01; /* ?? */
nkeynes@342:     buf[7] = (offset >> 16) & 0xFF;
nkeynes@342:     buf[8] = (offset >> 8) & 0xFF;
nkeynes@342:     buf[9] = offset & 0xFF;
nkeynes@342:     buf[10] = 0;
nkeynes@342:     buf[11] = (lba >> 16) & 0xFF;
nkeynes@342:     buf[12] = (lba >> 8) & 0xFF;
nkeynes@342:     buf[13] = lba & 0xFF;
nkeynes@422:     return PKT_ERR_OK;
nkeynes@342: }
nkeynes@342: 
nkeynes@342: static int gdrom_image_drive_status( gdrom_disc_t disc ) 
nkeynes@342: {
nkeynes@342:     gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@720:     if( image->disc_type == IDE_DISC_NONE ) {
nkeynes@720:         return IDE_DISC_NONE;
nkeynes@720:     } else {
nkeynes@720:         return image->disc_type | IDE_DISC_READY;
nkeynes@720:     }
nkeynes@342: }
nkeynes@342: 
nkeynes@342: void gdrom_image_dump_info( gdrom_disc_t d ) {
nkeynes@342:     gdrom_image_t disc = (gdrom_image_t)d;
nkeynes@342:     int i;
nkeynes@342:     int last_session = disc->track[disc->track_count-1].session;
nkeynes@342:     gboolean is_bootable = FALSE;
nkeynes@342: 
nkeynes@342:     INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, 
nkeynes@736:           disc->track[disc->track_count-1].session + 1 );
nkeynes@342:     if( last_session > 0 ) {
nkeynes@736:         /* Boot track is the first data track of the last session, provided that it 
nkeynes@736:          * cannot be a single-session disc.
nkeynes@736:          */
nkeynes@736:         int boot_track = -1;
nkeynes@736:         for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
nkeynes@736:             if( disc->track[i].flags & TRACK_DATA ) {
nkeynes@736:                 boot_track = i;
nkeynes@736:             }
nkeynes@736:         }
nkeynes@736:         if( boot_track != -1 ) {
nkeynes@736:             unsigned char boot_sector[MAX_SECTOR_SIZE];
nkeynes@736:             uint32_t length = sizeof(boot_sector);
nkeynes@736:             if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
nkeynes@736:                     boot_sector, &length ) == PKT_ERR_OK ) {
nkeynes@736:                 bootstrap_dump(boot_sector, FALSE);
nkeynes@736:                 is_bootable = TRUE;
nkeynes@736:             }
nkeynes@736:         }
nkeynes@342:     }
nkeynes@342:     if( !is_bootable ) {
nkeynes@736:         WARN( "Disc does not appear to be bootable" );
nkeynes@342:     }
nkeynes@342: }
nkeynes@342: 
nkeynes@709: gdrom_device_t gdrom_device_new( const gchar *name, const gchar *dev_name )
nkeynes@709: {
nkeynes@709:     struct gdrom_device *dev = g_malloc0( sizeof(struct gdrom_device) );
nkeynes@709:     dev->name = g_strdup(name);
nkeynes@709:     dev->device_name = g_strdup(dev_name);
nkeynes@709:     return dev;
nkeynes@709: }
nkeynes@709: 
nkeynes@709: void gdrom_device_destroy( gdrom_device_t dev )
nkeynes@709: {
nkeynes@709:     if( dev->name != NULL ) {
nkeynes@709:         g_free( dev->name );
nkeynes@709:         dev->name = NULL;
nkeynes@709:     }
nkeynes@709:     if( dev->device_name != NULL ) {
nkeynes@709:         g_free( dev->device_name );
nkeynes@709:         dev->device_name = NULL;
nkeynes@709:     }
nkeynes@709:     g_free( dev );
nkeynes@709: }