filename | src/gdrom/gdrom.c |
changeset | 167:71c0cc416a64 |
prev | 158:a0a82246b44e |
next | 168:203a72138e16 |
author | nkeynes |
date | Mon Jun 19 11:00:42 2006 +0000 (15 years ago) |
permissions | -rw-r--r-- |
last change | Add config value retrieval for pathnames Implement default path for disc + save state loaders Dump disc ID when mounting a CD |
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nkeynes@138 | 1 | /** |
nkeynes@167 | 2 | * $Id: gdrom.c,v 1.8 2006-06-19 11:00:42 nkeynes Exp $ |
nkeynes@138 | 3 | * |
nkeynes@138 | 4 | * GD-Rom access functions. |
nkeynes@138 | 5 | * |
nkeynes@138 | 6 | * Copyright (c) 2005 Nathan Keynes. |
nkeynes@138 | 7 | * |
nkeynes@138 | 8 | * This program is free software; you can redistribute it and/or modify |
nkeynes@138 | 9 | * it under the terms of the GNU General Public License as published by |
nkeynes@138 | 10 | * the Free Software Foundation; either version 2 of the License, or |
nkeynes@138 | 11 | * (at your option) any later version. |
nkeynes@138 | 12 | * |
nkeynes@138 | 13 | * This program is distributed in the hope that it will be useful, |
nkeynes@138 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
nkeynes@138 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
nkeynes@138 | 16 | * GNU General Public License for more details. |
nkeynes@138 | 17 | */ |
nkeynes@138 | 18 | |
nkeynes@138 | 19 | #include <stdio.h> |
nkeynes@138 | 20 | |
nkeynes@138 | 21 | #include "gdrom/ide.h" |
nkeynes@138 | 22 | #include "gdrom/gdrom.h" |
nkeynes@143 | 23 | #include "gdrom/packet.h" |
nkeynes@138 | 24 | #include "dream.h" |
nkeynes@138 | 25 | |
nkeynes@138 | 26 | static void gdrom_image_destroy( gdrom_disc_t ); |
nkeynes@152 | 27 | static gdrom_error_t gdrom_image_read_sectors( gdrom_disc_t, uint32_t, uint32_t, int, char *, uint32_t * ); |
nkeynes@138 | 28 | |
nkeynes@138 | 29 | |
nkeynes@138 | 30 | gdrom_disc_t gdrom_disc = NULL; |
nkeynes@138 | 31 | |
nkeynes@138 | 32 | char *gdrom_mode_names[] = { "Mode1", "Mode2", "XA 1", "XA2", "Audio", "GD-Rom" }; |
nkeynes@138 | 33 | uint32_t gdrom_sector_size[] = { 2048, 2336, 2048, 2324, 2352, 2336 }; |
nkeynes@138 | 34 | |
nkeynes@138 | 35 | gdrom_disc_t gdrom_image_open( const gchar *filename ) |
nkeynes@138 | 36 | { |
nkeynes@138 | 37 | return nrg_image_open( filename ); |
nkeynes@138 | 38 | } |
nkeynes@138 | 39 | |
nkeynes@138 | 40 | |
nkeynes@138 | 41 | gdrom_disc_t gdrom_image_new( FILE *file ) |
nkeynes@138 | 42 | { |
nkeynes@138 | 43 | struct gdrom_disc *disc = (struct gdrom_disc *)calloc(1, sizeof(struct gdrom_disc)); |
nkeynes@138 | 44 | if( disc == NULL ) |
nkeynes@138 | 45 | return NULL; |
nkeynes@138 | 46 | disc->read_sectors = gdrom_image_read_sectors; |
nkeynes@138 | 47 | disc->close = gdrom_image_destroy; |
nkeynes@138 | 48 | disc->disc_type = IDE_DISC_CDROM; |
nkeynes@138 | 49 | disc->file = file; |
nkeynes@138 | 50 | return disc; |
nkeynes@138 | 51 | } |
nkeynes@138 | 52 | |
nkeynes@138 | 53 | static void gdrom_image_destroy( gdrom_disc_t disc ) |
nkeynes@138 | 54 | { |
nkeynes@138 | 55 | if( disc->file != NULL ) { |
nkeynes@138 | 56 | fclose(disc->file); |
nkeynes@138 | 57 | disc->file = NULL; |
nkeynes@138 | 58 | } |
nkeynes@138 | 59 | free( disc ); |
nkeynes@138 | 60 | } |
nkeynes@138 | 61 | |
nkeynes@152 | 62 | static gdrom_error_t gdrom_image_read_sectors( gdrom_disc_t disc, uint32_t sector, |
nkeynes@152 | 63 | uint32_t sector_count, int mode, char *buf, |
nkeynes@152 | 64 | uint32_t *length ) |
nkeynes@138 | 65 | { |
nkeynes@152 | 66 | int i, file_offset, read_len; |
nkeynes@152 | 67 | struct gdrom_track *track = NULL; |
nkeynes@138 | 68 | |
nkeynes@138 | 69 | for( i=0; i<disc->track_count; i++ ) { |
nkeynes@138 | 70 | if( disc->track[i].lba <= sector && |
nkeynes@142 | 71 | (sector + sector_count) <= (disc->track[i].lba + disc->track[i].sector_count) ) { |
nkeynes@152 | 72 | track = &disc->track[i]; |
nkeynes@138 | 73 | break; |
nkeynes@138 | 74 | } |
nkeynes@138 | 75 | } |
nkeynes@152 | 76 | if( track == NULL ) |
nkeynes@143 | 77 | return PKT_ERR_BADREAD; |
nkeynes@152 | 78 | |
nkeynes@152 | 79 | file_offset = track->offset + track->sector_size * (sector - track->lba); |
nkeynes@152 | 80 | read_len = track->sector_size * sector_count; |
nkeynes@152 | 81 | |
nkeynes@152 | 82 | switch( mode ) { |
nkeynes@152 | 83 | case GDROM_GD: |
nkeynes@158 | 84 | // Temporarily comment this out - it's wrong, but... |
nkeynes@158 | 85 | // if( track->mode != GDROM_GD ) |
nkeynes@158 | 86 | // return PKT_ERR_BADREADMODE; |
nkeynes@158 | 87 | // break; |
nkeynes@152 | 88 | case GDROM_MODE1: |
nkeynes@152 | 89 | switch( track->mode ) { |
nkeynes@152 | 90 | case GDROM_MODE1: |
nkeynes@152 | 91 | case GDROM_MODE2_XA1: |
nkeynes@154 | 92 | fseek( disc->file, file_offset, SEEK_SET ); |
nkeynes@152 | 93 | fread( buf, track->sector_size, sector_count, disc->file ); |
nkeynes@152 | 94 | break; |
nkeynes@152 | 95 | case GDROM_MODE2: |
nkeynes@152 | 96 | read_len = sector_count * 2048; |
nkeynes@154 | 97 | file_offset += 8; /* skip the subheader */ |
nkeynes@152 | 98 | while( sector_count > 0 ) { |
nkeynes@154 | 99 | fseek( disc->file, file_offset, SEEK_SET ); |
nkeynes@152 | 100 | fread( buf, 2048, 1, disc->file ); |
nkeynes@152 | 101 | file_offset += track->sector_size; |
nkeynes@152 | 102 | buf += 2048; |
nkeynes@152 | 103 | sector_count--; |
nkeynes@152 | 104 | } |
nkeynes@152 | 105 | break; |
nkeynes@152 | 106 | default: |
nkeynes@152 | 107 | return PKT_ERR_BADREADMODE; |
nkeynes@152 | 108 | } |
nkeynes@152 | 109 | break; |
nkeynes@152 | 110 | default: |
nkeynes@143 | 111 | return PKT_ERR_BADREADMODE; |
nkeynes@152 | 112 | } |
nkeynes@152 | 113 | |
nkeynes@143 | 114 | *length = read_len; |
nkeynes@143 | 115 | return PKT_ERR_OK; |
nkeynes@138 | 116 | } |
nkeynes@138 | 117 | |
nkeynes@138 | 118 | uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count, |
nkeynes@143 | 119 | int mode, char *buf, uint32_t *length ) |
nkeynes@138 | 120 | { |
nkeynes@138 | 121 | if( gdrom_disc == NULL ) |
nkeynes@143 | 122 | return PKT_ERR_NODISC; /* No media */ |
nkeynes@143 | 123 | return gdrom_disc->read_sectors( gdrom_disc, sector, sector_count, mode, buf, length ); |
nkeynes@138 | 124 | } |
nkeynes@138 | 125 | |
nkeynes@138 | 126 | |
nkeynes@167 | 127 | void gdrom_dump_disc_info( gdrom_disc_t disc ) { |
nkeynes@138 | 128 | int i; |
nkeynes@167 | 129 | int last_session = disc->track[disc->track_count-1].session; |
nkeynes@167 | 130 | gboolean is_bootable = FALSE; |
nkeynes@167 | 131 | |
nkeynes@138 | 132 | INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, |
nkeynes@138 | 133 | disc->track[disc->track_count-1].session + 1 ); |
nkeynes@167 | 134 | if( last_session > 0 ) { |
nkeynes@167 | 135 | /* Boot track is the first data track of the last session, provided that it |
nkeynes@167 | 136 | * cannot be a single-session disc. |
nkeynes@167 | 137 | */ |
nkeynes@167 | 138 | int boot_track = -1; |
nkeynes@167 | 139 | for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) { |
nkeynes@167 | 140 | if( disc->track[i].flags & TRACK_DATA ) { |
nkeynes@167 | 141 | boot_track = i; |
nkeynes@167 | 142 | } |
nkeynes@167 | 143 | } |
nkeynes@167 | 144 | if( boot_track != -1 ) { |
nkeynes@167 | 145 | char boot_sector[2048]; |
nkeynes@167 | 146 | uint32_t length = sizeof(boot_sector); |
nkeynes@167 | 147 | if( disc->read_sectors( disc, disc->track[boot_track].lba, 1, GDROM_MODE1, |
nkeynes@167 | 148 | boot_sector, &length ) == PKT_ERR_OK ) { |
nkeynes@167 | 149 | bootstrap_dump(boot_sector, FALSE); |
nkeynes@167 | 150 | is_bootable = TRUE; |
nkeynes@167 | 151 | } |
nkeynes@167 | 152 | } |
nkeynes@138 | 153 | } |
nkeynes@167 | 154 | if( !is_bootable ) |
nkeynes@167 | 155 | WARN( "Disc does not appear to be bootable" ); |
nkeynes@138 | 156 | } |
nkeynes@138 | 157 | |
nkeynes@149 | 158 | gdrom_error_t gdrom_get_toc( char *buf ) |
nkeynes@138 | 159 | { |
nkeynes@142 | 160 | struct gdrom_toc *toc = (struct gdrom_toc *)buf; |
nkeynes@142 | 161 | int i; |
nkeynes@142 | 162 | |
nkeynes@138 | 163 | if( gdrom_disc == NULL ) |
nkeynes@149 | 164 | return PKT_ERR_NODISC; |
nkeynes@142 | 165 | |
nkeynes@142 | 166 | for( i=0; i<gdrom_disc->track_count; i++ ) { |
nkeynes@142 | 167 | toc->track[i] = htonl( gdrom_disc->track[i].lba ) | gdrom_disc->track[i].flags; |
nkeynes@142 | 168 | } |
nkeynes@142 | 169 | toc->first = 0x0100 | gdrom_disc->track[0].flags; |
nkeynes@142 | 170 | toc->last = (gdrom_disc->track_count<<8) | gdrom_disc->track[i-1].flags; |
nkeynes@142 | 171 | toc->leadout = htonl(gdrom_disc->track[i-1].lba + gdrom_disc->track[i-1].sector_count) | |
nkeynes@142 | 172 | gdrom_disc->track[i-1].flags; |
nkeynes@142 | 173 | for( ;i<99; i++ ) |
nkeynes@142 | 174 | toc->track[i] = 0xFFFFFFFF; |
nkeynes@149 | 175 | return PKT_ERR_OK; |
nkeynes@149 | 176 | } |
nkeynes@149 | 177 | |
nkeynes@152 | 178 | gdrom_error_t gdrom_get_info( char *buf, int session ) |
nkeynes@149 | 179 | { |
nkeynes@149 | 180 | if( gdrom_disc == NULL ) |
nkeynes@149 | 181 | return PKT_ERR_NODISC; |
nkeynes@149 | 182 | struct gdrom_track *last_track = &gdrom_disc->track[gdrom_disc->track_count-1]; |
nkeynes@149 | 183 | unsigned int end_of_disc = last_track->lba + last_track->sector_count; |
nkeynes@152 | 184 | int i; |
nkeynes@152 | 185 | buf[0] = 0x01; /* Disc status? */ |
nkeynes@149 | 186 | buf[1] = 0; |
nkeynes@152 | 187 | |
nkeynes@152 | 188 | if( session == 0 ) { |
nkeynes@152 | 189 | buf[2] = last_track->session+1; /* last session */ |
nkeynes@152 | 190 | buf[3] = (end_of_disc >> 16) & 0xFF; |
nkeynes@152 | 191 | buf[4] = (end_of_disc >> 8) & 0xFF; |
nkeynes@152 | 192 | buf[5] = end_of_disc & 0xFF; |
nkeynes@152 | 193 | return PKT_ERR_OK; |
nkeynes@152 | 194 | } else { |
nkeynes@152 | 195 | session--; |
nkeynes@152 | 196 | for( i=0; i<gdrom_disc->track_count; i++ ) { |
nkeynes@152 | 197 | if( gdrom_disc->track[i].session == session ) { |
nkeynes@152 | 198 | buf[2] = i+1; /* first track of session */ |
nkeynes@152 | 199 | buf[3] = (gdrom_disc->track[i].lba >> 16) & 0xFF; |
nkeynes@152 | 200 | buf[4] = (gdrom_disc->track[i].lba >> 8) & 0xFF; |
nkeynes@152 | 201 | buf[5] = gdrom_disc->track[i].lba & 0xFF; |
nkeynes@152 | 202 | return PKT_ERR_OK; |
nkeynes@152 | 203 | } |
nkeynes@152 | 204 | } |
nkeynes@152 | 205 | return PKT_ERR_BADFIELD; /* No such session */ |
nkeynes@152 | 206 | } |
nkeynes@152 | 207 | |
nkeynes@138 | 208 | } |
nkeynes@138 | 209 | |
nkeynes@138 | 210 | void gdrom_mount_disc( gdrom_disc_t disc ) |
nkeynes@138 | 211 | { |
nkeynes@138 | 212 | gdrom_unmount_disc(); |
nkeynes@138 | 213 | gdrom_disc = disc; |
nkeynes@138 | 214 | idereg.disc = disc->disc_type | IDE_DISC_READY; |
nkeynes@167 | 215 | gdrom_dump_disc_info( disc ); |
nkeynes@138 | 216 | } |
nkeynes@138 | 217 | |
nkeynes@138 | 218 | gdrom_disc_t gdrom_mount_image( const gchar *filename ) |
nkeynes@138 | 219 | { |
nkeynes@138 | 220 | gdrom_disc_t disc = gdrom_image_open(filename); |
nkeynes@138 | 221 | if( disc != NULL ) |
nkeynes@138 | 222 | gdrom_mount_disc( disc ); |
nkeynes@138 | 223 | return disc; |
nkeynes@138 | 224 | } |
nkeynes@138 | 225 | |
nkeynes@138 | 226 | void gdrom_unmount_disc( ) |
nkeynes@138 | 227 | { |
nkeynes@138 | 228 | if( gdrom_disc != NULL ) { |
nkeynes@138 | 229 | gdrom_disc->close(gdrom_disc); |
nkeynes@138 | 230 | } |
nkeynes@138 | 231 | gdrom_disc = NULL; |
nkeynes@138 | 232 | idereg.disc = IDE_DISC_NONE; |
nkeynes@138 | 233 | } |
nkeynes@138 | 234 | |
nkeynes@138 | 235 | gboolean gdrom_is_mounted( void ) |
nkeynes@138 | 236 | { |
nkeynes@138 | 237 | return gdrom_disc != NULL; |
nkeynes@138 | 238 | } |
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