nkeynes@342 | 1 | /**
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nkeynes@342 | 2 | * $Id: gdimage.c,v 1.1 2007-01-31 10:58:42 nkeynes Exp $
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nkeynes@342 | 3 | *
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nkeynes@342 | 4 | * GD-Rom image-file common functions.
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nkeynes@342 | 5 | *
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nkeynes@342 | 6 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@342 | 7 | *
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nkeynes@342 | 8 | * This program is free software; you can redistribute it and/or modify
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nkeynes@342 | 9 | * it under the terms of the GNU General Public License as published by
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nkeynes@342 | 10 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@342 | 11 | * (at your option) any later version.
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nkeynes@342 | 12 | *
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nkeynes@342 | 13 | * This program is distributed in the hope that it will be useful,
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nkeynes@342 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@342 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@342 | 16 | * GNU General Public License for more details.
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nkeynes@342 | 17 | */
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nkeynes@342 | 18 |
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nkeynes@342 | 19 | #include "gdrom/gdrom.h"
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nkeynes@342 | 20 | #include "gdrom/packet.h"
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nkeynes@342 | 21 |
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nkeynes@342 | 22 | static void gdrom_image_destroy( gdrom_disc_t disc );
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nkeynes@342 | 23 | static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode,
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nkeynes@342 | 24 | char *buf, uint32_t *readlength );
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nkeynes@342 | 25 | static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, char *buf );
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nkeynes@342 | 26 | static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, char *buf );
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nkeynes@342 | 27 | static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, char *buf );
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nkeynes@342 | 28 | static int gdrom_image_drive_status( gdrom_disc_t disc );
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nkeynes@342 | 29 |
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nkeynes@342 | 30 |
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nkeynes@342 | 31 | /**
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nkeynes@342 | 32 | * Initialize a gdrom_disc structure with the gdrom_image_* methods
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nkeynes@342 | 33 | */
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nkeynes@342 | 34 | void gdrom_image_init( gdrom_disc_t disc )
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nkeynes@342 | 35 | {
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nkeynes@342 | 36 | memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
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nkeynes@342 | 37 | disc->read_sector = gdrom_image_read_sector;
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nkeynes@342 | 38 | disc->read_toc = gdrom_image_read_toc;
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nkeynes@342 | 39 | disc->read_session = gdrom_image_read_session;
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nkeynes@342 | 40 | disc->read_position = gdrom_image_read_position;
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nkeynes@342 | 41 | disc->drive_status = gdrom_image_drive_status;
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nkeynes@342 | 42 | disc->play_audio = NULL; /* not supported yet */
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nkeynes@342 | 43 | disc->run_time_slice = NULL; /* not needed */
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nkeynes@342 | 44 | disc->close = gdrom_image_destroy;
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nkeynes@342 | 45 | }
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nkeynes@342 | 46 |
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nkeynes@342 | 47 | gdrom_disc_t gdrom_image_new( FILE *f )
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nkeynes@342 | 48 | {
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nkeynes@342 | 49 | gdrom_image_t image = (gdrom_image_t)calloc(sizeof(struct gdrom_image), 1);
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nkeynes@342 | 50 | if( image == NULL ) {
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nkeynes@342 | 51 | return NULL;
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nkeynes@342 | 52 | }
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nkeynes@342 | 53 | image->disc_type = IDE_DISC_CDROM;
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nkeynes@342 | 54 | image->file = f;
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nkeynes@342 | 55 |
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nkeynes@342 | 56 | gdrom_disc_t disc = (gdrom_disc_t)image;
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nkeynes@342 | 57 | gdrom_image_init(disc);
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nkeynes@342 | 58 | return disc;
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nkeynes@342 | 59 | }
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nkeynes@342 | 60 |
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nkeynes@342 | 61 | static void gdrom_image_destroy( gdrom_disc_t disc )
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nkeynes@342 | 62 | {
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nkeynes@342 | 63 | gdrom_image_t img = (gdrom_image_t)disc;
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nkeynes@342 | 64 | if( img->file != NULL ) {
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nkeynes@342 | 65 | fclose(img->file);
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nkeynes@342 | 66 | img->file = NULL;
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nkeynes@342 | 67 | }
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nkeynes@342 | 68 | free( disc );
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nkeynes@342 | 69 | }
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nkeynes@342 | 70 |
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nkeynes@342 | 71 | static int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
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nkeynes@342 | 72 | {
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nkeynes@342 | 73 | int i;
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nkeynes@342 | 74 | for( i=0; i<image->track_count; i++ ) {
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nkeynes@342 | 75 | if( image->track[i].lba <= lba &&
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nkeynes@342 | 76 | lba < (image->track[i].lba + image->track[i].sector_count) ) {
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nkeynes@342 | 77 | return i+1;
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nkeynes@342 | 78 | }
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nkeynes@342 | 79 | }
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nkeynes@342 | 80 | return -1;
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nkeynes@342 | 81 | }
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nkeynes@342 | 82 |
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nkeynes@342 | 83 | static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
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nkeynes@342 | 84 | int mode, char *buf, uint32_t *length )
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nkeynes@342 | 85 | {
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nkeynes@342 | 86 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@342 | 87 | int i, file_offset, read_len, track_no;
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nkeynes@342 | 88 |
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nkeynes@342 | 89 | track_no = gdrom_image_get_track_by_lba( image, lba );
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nkeynes@342 | 90 | if( track_no == -1 ) {
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nkeynes@342 | 91 | return PKT_ERR_BADREAD;
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nkeynes@342 | 92 | }
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nkeynes@342 | 93 | struct gdrom_track *track = &image->track[track_no-1];
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nkeynes@342 | 94 | file_offset = track->offset + track->sector_size * (lba - track->lba);
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nkeynes@342 | 95 | read_len = track->sector_size;
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nkeynes@342 | 96 |
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nkeynes@342 | 97 | switch( mode ) {
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nkeynes@342 | 98 | case 0x24:
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nkeynes@342 | 99 | case 0x28:
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nkeynes@342 | 100 | switch( track->mode ) {
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nkeynes@342 | 101 | case GDROM_MODE1:
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nkeynes@342 | 102 | case GDROM_MODE2_XA1:
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nkeynes@342 | 103 | fseek( image->file, file_offset, SEEK_SET );
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nkeynes@342 | 104 | fread( buf, track->sector_size, 1, image->file );
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nkeynes@342 | 105 | break;
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nkeynes@342 | 106 | case GDROM_MODE2:
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nkeynes@342 | 107 | read_len = 2048;
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nkeynes@342 | 108 | file_offset += 8; /* skip the subheader */
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nkeynes@342 | 109 | fseek( image->file, file_offset, SEEK_SET );
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nkeynes@342 | 110 | fread( buf, 2048, 1, image->file );
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nkeynes@342 | 111 | break;
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nkeynes@342 | 112 | default:
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nkeynes@342 | 113 | return PKT_ERR_BADREADMODE;
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nkeynes@342 | 114 | }
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nkeynes@342 | 115 | break;
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nkeynes@342 | 116 | default:
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nkeynes@342 | 117 | return PKT_ERR_BADREADMODE;
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nkeynes@342 | 118 | }
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nkeynes@342 | 119 |
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nkeynes@342 | 120 | *length = read_len;
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nkeynes@342 | 121 | return PKT_ERR_OK;
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nkeynes@342 | 122 |
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nkeynes@342 | 123 | }
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nkeynes@342 | 124 |
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nkeynes@342 | 125 | static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, char *buf )
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nkeynes@342 | 126 | {
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nkeynes@342 | 127 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@342 | 128 | struct gdrom_toc *toc = (struct gdrom_toc *)buf;
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nkeynes@342 | 129 | int i;
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nkeynes@342 | 130 |
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nkeynes@342 | 131 | for( i=0; i<image->track_count; i++ ) {
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nkeynes@342 | 132 | toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
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nkeynes@342 | 133 | }
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nkeynes@342 | 134 | toc->first = 0x0100 | image->track[0].flags;
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nkeynes@342 | 135 | toc->last = (image->track_count<<8) | image->track[i-1].flags;
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nkeynes@342 | 136 | toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
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nkeynes@342 | 137 | image->track[i-1].flags;
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nkeynes@342 | 138 | for( ;i<99; i++ )
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nkeynes@342 | 139 | toc->track[i] = 0xFFFFFFFF;
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nkeynes@342 | 140 | return PKT_ERR_OK;
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nkeynes@342 | 141 | }
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nkeynes@342 | 142 |
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nkeynes@342 | 143 | static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, char *buf )
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nkeynes@342 | 144 | {
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nkeynes@342 | 145 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@342 | 146 | struct gdrom_track *last_track = &image->track[image->track_count-1];
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nkeynes@342 | 147 | unsigned int end_of_disc = last_track->lba + last_track->sector_count;
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nkeynes@342 | 148 | int i;
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nkeynes@342 | 149 | buf[0] = 0x01; /* Disc status? */
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nkeynes@342 | 150 | buf[1] = 0;
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nkeynes@342 | 151 |
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nkeynes@342 | 152 | if( session == 0 ) {
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nkeynes@342 | 153 | buf[2] = last_track->session+1; /* last session */
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nkeynes@342 | 154 | buf[3] = (end_of_disc >> 16) & 0xFF;
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nkeynes@342 | 155 | buf[4] = (end_of_disc >> 8) & 0xFF;
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nkeynes@342 | 156 | buf[5] = end_of_disc & 0xFF;
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nkeynes@342 | 157 | return PKT_ERR_OK;
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nkeynes@342 | 158 | } else {
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nkeynes@342 | 159 | session--;
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nkeynes@342 | 160 | for( i=0; i<image->track_count; i++ ) {
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nkeynes@342 | 161 | if( image->track[i].session == session ) {
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nkeynes@342 | 162 | buf[2] = i+1; /* first track of session */
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nkeynes@342 | 163 | buf[3] = (image->track[i].lba >> 16) & 0xFF;
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nkeynes@342 | 164 | buf[4] = (image->track[i].lba >> 8) & 0xFF;
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nkeynes@342 | 165 | buf[5] = image->track[i].lba & 0xFF;
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nkeynes@342 | 166 | return PKT_ERR_OK;
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nkeynes@342 | 167 | }
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nkeynes@342 | 168 | }
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nkeynes@342 | 169 | return PKT_ERR_BADFIELD; /* No such session */
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nkeynes@342 | 170 | }
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nkeynes@342 | 171 | }
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nkeynes@342 | 172 |
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nkeynes@342 | 173 | static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, char *buf )
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nkeynes@342 | 174 | {
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nkeynes@342 | 175 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@342 | 176 | int track_no = gdrom_image_get_track_by_lba( image, lba );
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nkeynes@342 | 177 | if( track_no == -1 ) {
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nkeynes@342 | 178 | track_no = 1;
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nkeynes@342 | 179 | lba = 150;
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nkeynes@342 | 180 | }
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nkeynes@342 | 181 | struct gdrom_track *track = &image->track[track_no-1];
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nkeynes@342 | 182 | uint32_t offset = lba - track->lba;
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nkeynes@342 | 183 | buf[4] = track->flags;
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nkeynes@342 | 184 | buf[5] = track_no;
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nkeynes@342 | 185 | buf[6] = 0x01; /* ?? */
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nkeynes@342 | 186 | buf[7] = (offset >> 16) & 0xFF;
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nkeynes@342 | 187 | buf[8] = (offset >> 8) & 0xFF;
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nkeynes@342 | 188 | buf[9] = offset & 0xFF;
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nkeynes@342 | 189 | buf[10] = 0;
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nkeynes@342 | 190 | buf[11] = (lba >> 16) & 0xFF;
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nkeynes@342 | 191 | buf[12] = (lba >> 8) & 0xFF;
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nkeynes@342 | 192 | buf[13] = lba & 0xFF;
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nkeynes@342 | 193 | }
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nkeynes@342 | 194 |
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nkeynes@342 | 195 | static int gdrom_image_drive_status( gdrom_disc_t disc )
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nkeynes@342 | 196 | {
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nkeynes@342 | 197 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@342 | 198 | return image->disc_type | IDE_DISC_READY;
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nkeynes@342 | 199 | }
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nkeynes@342 | 200 |
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nkeynes@342 | 201 | void gdrom_image_dump_info( gdrom_disc_t d ) {
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nkeynes@342 | 202 | gdrom_image_t disc = (gdrom_image_t)d;
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nkeynes@342 | 203 | int i;
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nkeynes@342 | 204 | int last_session = disc->track[disc->track_count-1].session;
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nkeynes@342 | 205 | gboolean is_bootable = FALSE;
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nkeynes@342 | 206 |
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nkeynes@342 | 207 | INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
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nkeynes@342 | 208 | disc->track[disc->track_count-1].session + 1 );
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nkeynes@342 | 209 | if( last_session > 0 ) {
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nkeynes@342 | 210 | /* Boot track is the first data track of the last session, provided that it
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nkeynes@342 | 211 | * cannot be a single-session disc.
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nkeynes@342 | 212 | */
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nkeynes@342 | 213 | int boot_track = -1;
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nkeynes@342 | 214 | for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
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nkeynes@342 | 215 | if( disc->track[i].flags & TRACK_DATA ) {
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nkeynes@342 | 216 | boot_track = i;
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nkeynes@342 | 217 | }
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nkeynes@342 | 218 | }
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nkeynes@342 | 219 | if( boot_track != -1 ) {
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nkeynes@342 | 220 | char boot_sector[MAX_SECTOR_SIZE];
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nkeynes@342 | 221 | uint32_t length = sizeof(boot_sector);
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nkeynes@342 | 222 | if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
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nkeynes@342 | 223 | boot_sector, &length ) == PKT_ERR_OK ) {
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nkeynes@342 | 224 | bootstrap_dump(boot_sector, FALSE);
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nkeynes@342 | 225 | is_bootable = TRUE;
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nkeynes@342 | 226 | }
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nkeynes@342 | 227 | }
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nkeynes@342 | 228 | }
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nkeynes@342 | 229 | if( !is_bootable ) {
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nkeynes@342 | 230 | WARN( "Disc does not appear to be bootable" );
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nkeynes@342 | 231 | }
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nkeynes@342 | 232 | }
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nkeynes@342 | 233 |
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