Search
lxdream.org :: lxdream/src/gdrom/gdimage.c
lxdream 0.9.1
released Jun 29
Download Now
filename src/gdrom/gdimage.c
changeset 796:a2dc83592467
prev782:1af8b5ce627c
next837:4eae2ddccf9c
author nkeynes
date Wed Jul 30 22:50:44 2008 +0000 (12 years ago)
permissions -rw-r--r--
last change Bug #61: OpenBSD support
(Modified) patch from bsdmaniak, thanks!
file annotate diff log raw
nkeynes@342
     1
/**
nkeynes@561
     2
 * $Id$
nkeynes@342
     3
 *
nkeynes@342
     4
 * GD-Rom image-file common functions. 
nkeynes@342
     5
 *
nkeynes@342
     6
 * Copyright (c) 2005 Nathan Keynes.
nkeynes@342
     7
 *
nkeynes@342
     8
 * This program is free software; you can redistribute it and/or modify
nkeynes@342
     9
 * it under the terms of the GNU General Public License as published by
nkeynes@342
    10
 * the Free Software Foundation; either version 2 of the License, or
nkeynes@342
    11
 * (at your option) any later version.
nkeynes@342
    12
 *
nkeynes@342
    13
 * This program is distributed in the hope that it will be useful,
nkeynes@342
    14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@342
    15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@342
    16
 * GNU General Public License for more details.
nkeynes@342
    17
 */
nkeynes@342
    18
nkeynes@644
    19
#include <assert.h>
nkeynes@759
    20
#include <stdlib.h>
nkeynes@736
    21
#include <string.h>
nkeynes@796
    22
#include <sys/types.h>
nkeynes@422
    23
#include <netinet/in.h>
nkeynes@422
    24
nkeynes@678
    25
#include "gdrom/gddriver.h"
nkeynes@342
    26
#include "gdrom/packet.h"
nkeynes@644
    27
#include "ecc.h"
nkeynes@422
    28
#include "bootstrap.h"
nkeynes@342
    29
nkeynes@342
    30
static void gdrom_image_destroy( gdrom_disc_t disc );
nkeynes@342
    31
static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode, 
nkeynes@736
    32
                                              unsigned char *buf, uint32_t *readlength );
nkeynes@422
    33
static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf );
nkeynes@422
    34
static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf );
nkeynes@422
    35
static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf );
nkeynes@342
    36
static int gdrom_image_drive_status( gdrom_disc_t disc );
nkeynes@342
    37
nkeynes@644
    38
static uint8_t gdrom_default_sync[12] = { 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0 };
nkeynes@644
    39
nkeynes@644
    40
#define SECTOR_HEADER_SIZE 16
nkeynes@644
    41
#define SECTOR_SUBHEADER_SIZE 8
nkeynes@644
    42
nkeynes@644
    43
/* Data offset (from start of raw sector) by sector mode */
nkeynes@644
    44
static int gdrom_data_offset[] = { 16, 16, 16, 24, 24, 0, 8, 0, 0 };
nkeynes@644
    45
nkeynes@644
    46
nkeynes@644
    47
nkeynes@498
    48
struct cdrom_sector_header {
nkeynes@498
    49
    uint8_t sync[12];
nkeynes@498
    50
    uint8_t msf[3];
nkeynes@498
    51
    uint8_t mode;
nkeynes@644
    52
    uint8_t subhead[8]; // Mode-2 XA sectors only
nkeynes@498
    53
};
nkeynes@342
    54
nkeynes@342
    55
/**
nkeynes@342
    56
 * Initialize a gdrom_disc structure with the gdrom_image_* methods
nkeynes@342
    57
 */
nkeynes@342
    58
void gdrom_image_init( gdrom_disc_t disc )
nkeynes@342
    59
{
nkeynes@342
    60
    memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
nkeynes@342
    61
    disc->read_sector = gdrom_image_read_sector;
nkeynes@342
    62
    disc->read_toc = gdrom_image_read_toc;
nkeynes@342
    63
    disc->read_session = gdrom_image_read_session;
nkeynes@342
    64
    disc->read_position = gdrom_image_read_position;
nkeynes@342
    65
    disc->drive_status = gdrom_image_drive_status;
nkeynes@342
    66
    disc->play_audio = NULL; /* not supported yet */
nkeynes@342
    67
    disc->run_time_slice = NULL; /* not needed */
nkeynes@342
    68
    disc->close = gdrom_image_destroy;
nkeynes@342
    69
}
nkeynes@342
    70
nkeynes@464
    71
gdrom_disc_t gdrom_image_new( const gchar *filename, FILE *f )
nkeynes@342
    72
{
nkeynes@736
    73
    gdrom_image_t image = (gdrom_image_t)g_malloc0(sizeof(struct gdrom_image));
nkeynes@342
    74
    if( image == NULL ) {
nkeynes@736
    75
        return NULL;
nkeynes@342
    76
    }
nkeynes@644
    77
    image->disc_type = IDE_DISC_CDROMXA;
nkeynes@342
    78
    image->file = f;
nkeynes@342
    79
    gdrom_disc_t disc = (gdrom_disc_t)image;
nkeynes@342
    80
    gdrom_image_init(disc);
nkeynes@464
    81
    if( filename == NULL ) {
nkeynes@736
    82
        disc->name = NULL;
nkeynes@464
    83
    } else {
nkeynes@736
    84
        disc->name = g_strdup(filename);
nkeynes@464
    85
    }
nkeynes@464
    86
nkeynes@342
    87
    return disc;
nkeynes@342
    88
}
nkeynes@342
    89
nkeynes@342
    90
static void gdrom_image_destroy( gdrom_disc_t disc )
nkeynes@342
    91
{
nkeynes@492
    92
    int i;
nkeynes@492
    93
    FILE *lastfile = NULL;
nkeynes@342
    94
    gdrom_image_t img = (gdrom_image_t)disc;
nkeynes@342
    95
    if( img->file != NULL ) {
nkeynes@736
    96
        fclose(img->file);
nkeynes@736
    97
        img->file = NULL;
nkeynes@342
    98
    }
nkeynes@492
    99
    for( i=0; i<img->track_count; i++ ) {
nkeynes@736
   100
        if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
nkeynes@736
   101
            lastfile = img->track[i].file;
nkeynes@736
   102
            fclose(lastfile);
nkeynes@736
   103
            img->track[i].file = NULL;
nkeynes@736
   104
        }
nkeynes@492
   105
    }
nkeynes@464
   106
    if( disc->name != NULL ) {
nkeynes@736
   107
        g_free( (gpointer)disc->name );
nkeynes@736
   108
        disc->name = NULL;
nkeynes@464
   109
    }
nkeynes@342
   110
    free( disc );
nkeynes@342
   111
}
nkeynes@342
   112
nkeynes@468
   113
void gdrom_image_destroy_no_close( gdrom_disc_t disc )
nkeynes@468
   114
{
nkeynes@492
   115
    int i;
nkeynes@492
   116
    FILE *lastfile = NULL;
nkeynes@468
   117
    gdrom_image_t img = (gdrom_image_t)disc;
nkeynes@468
   118
    if( img->file != NULL ) {
nkeynes@736
   119
        img->file = NULL;
nkeynes@468
   120
    }
nkeynes@492
   121
    for( i=0; i<img->track_count; i++ ) {
nkeynes@736
   122
        if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
nkeynes@736
   123
            lastfile = img->track[i].file;
nkeynes@736
   124
            fclose(lastfile);
nkeynes@736
   125
            img->track[i].file = NULL;
nkeynes@736
   126
        }
nkeynes@492
   127
    }
nkeynes@468
   128
    if( disc->name != NULL ) {
nkeynes@736
   129
        g_free( (gpointer)disc->name );
nkeynes@736
   130
        disc->name = NULL;
nkeynes@468
   131
    }
nkeynes@468
   132
    free( disc );
nkeynes@468
   133
}
nkeynes@468
   134
nkeynes@782
   135
int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
nkeynes@342
   136
{
nkeynes@342
   137
    int i;
nkeynes@342
   138
    for( i=0; i<image->track_count; i++ ) {
nkeynes@736
   139
        if( image->track[i].lba <= lba && 
nkeynes@736
   140
                lba < (image->track[i].lba + image->track[i].sector_count) ) {
nkeynes@736
   141
            return i+1;
nkeynes@736
   142
        }
nkeynes@342
   143
    }
nkeynes@342
   144
    return -1;
nkeynes@342
   145
}
nkeynes@342
   146
nkeynes@492
   147
/**
nkeynes@492
   148
 * Read a block from an image file, handling negative file offsets
nkeynes@492
   149
 * with 0-fill.
nkeynes@492
   150
 */
nkeynes@644
   151
static gboolean gdrom_read_block( unsigned char *buf, int file_offset, int length, FILE *f )
nkeynes@492
   152
{
nkeynes@492
   153
    if( file_offset < 0 ) {
nkeynes@736
   154
        int size = -file_offset;
nkeynes@736
   155
        if( size >= length ) {
nkeynes@736
   156
            memset( buf, 0, length );
nkeynes@736
   157
            return TRUE;
nkeynes@736
   158
        } else {
nkeynes@736
   159
            memset( buf, 0, size );
nkeynes@736
   160
            file_offset = 0;
nkeynes@736
   161
            length -= size;
nkeynes@736
   162
        }
nkeynes@492
   163
    }
nkeynes@492
   164
    fseek( f, file_offset, SEEK_SET );
nkeynes@644
   165
    return fread( buf, length, 1, f ) == 1;
nkeynes@492
   166
}
nkeynes@492
   167
nkeynes@644
   168
static void gdrom_build_sector_header( unsigned char *buf, uint32_t lba, 
nkeynes@736
   169
                                       gdrom_track_mode_t sector_mode )
nkeynes@644
   170
{
nkeynes@644
   171
    memcpy( buf, gdrom_default_sync, 12 );
nkeynes@644
   172
    cd_build_address( buf, sector_mode, lba );
nkeynes@644
   173
}
nkeynes@644
   174
nkeynes@644
   175
/**
nkeynes@644
   176
 * Return TRUE if the given read mode + track modes are compatible,
nkeynes@644
   177
 * otherwise FALSE.
nkeynes@644
   178
 * @param track_mode one of the GDROM_MODE* constants
nkeynes@644
   179
 * @param read_mode the READ_CD_MODE from the read request
nkeynes@644
   180
 */
nkeynes@644
   181
static gboolean gdrom_is_compatible_read_mode( int track_mode, int read_mode )
nkeynes@644
   182
{
nkeynes@644
   183
    switch( read_mode ) {
nkeynes@644
   184
    case READ_CD_MODE_ANY:
nkeynes@736
   185
        return TRUE;
nkeynes@644
   186
    case READ_CD_MODE_CDDA:
nkeynes@736
   187
        return track_mode == GDROM_CDDA;
nkeynes@644
   188
    case READ_CD_MODE_1:
nkeynes@736
   189
        return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1;
nkeynes@644
   190
    case READ_CD_MODE_2_FORM_1:
nkeynes@736
   191
        return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1;
nkeynes@644
   192
    case READ_CD_MODE_2_FORM_2:
nkeynes@736
   193
        return track_mode == GDROM_MODE2_FORM2;
nkeynes@644
   194
    case READ_CD_MODE_2:
nkeynes@736
   195
        return track_mode == GDROM_MODE2_FORMLESS;
nkeynes@644
   196
    default:
nkeynes@736
   197
        return FALSE;
nkeynes@644
   198
    }
nkeynes@644
   199
}
nkeynes@644
   200
nkeynes@644
   201
/**
nkeynes@644
   202
 * Determine the start position in a raw sector, and the amount of data to read
nkeynes@644
   203
 * in bytes, for a given combination of sector mode and read mode.
nkeynes@644
   204
 */ 
nkeynes@644
   205
static void gdrom_get_read_bounds( int sector_mode, int read_mode, int *start, int *size )
nkeynes@644
   206
{
nkeynes@644
   207
    if( READ_CD_RAW(read_mode) ) {
nkeynes@736
   208
        // whole sector
nkeynes@736
   209
        *start = 0;
nkeynes@736
   210
        *size = 2352;
nkeynes@644
   211
    } else {
nkeynes@736
   212
        *size = 0;
nkeynes@736
   213
        if( READ_CD_DATA(read_mode) ) {
nkeynes@736
   214
            *start = gdrom_data_offset[sector_mode];
nkeynes@736
   215
            *size = gdrom_sector_size[sector_mode];
nkeynes@736
   216
        }
nkeynes@644
   217
nkeynes@736
   218
        if( READ_CD_SUBHEAD(read_mode) && 
nkeynes@736
   219
                (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
nkeynes@736
   220
            *start = SECTOR_HEADER_SIZE;
nkeynes@736
   221
            *size += SECTOR_SUBHEADER_SIZE;
nkeynes@736
   222
        }
nkeynes@644
   223
nkeynes@736
   224
        if( READ_CD_HEADER(read_mode) ) {
nkeynes@736
   225
            *size += SECTOR_HEADER_SIZE;
nkeynes@736
   226
            *start = 0;
nkeynes@736
   227
        }
nkeynes@644
   228
nkeynes@644
   229
    }
nkeynes@644
   230
}
nkeynes@644
   231
nkeynes@782
   232
void gdrom_extract_raw_data_sector( char *sector_data, int channels, unsigned char *buf, uint32_t *length )
nkeynes@782
   233
{
nkeynes@782
   234
    int sector_mode;
nkeynes@782
   235
    int start, size;
nkeynes@782
   236
    struct cdrom_sector_header *secthead = (struct cdrom_sector_header *)sector_data;
nkeynes@782
   237
    if( secthead->mode == 1 ) {
nkeynes@782
   238
        sector_mode = GDROM_MODE1;
nkeynes@782
   239
    } else {
nkeynes@782
   240
        sector_mode = ((secthead->subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
nkeynes@782
   241
    }
nkeynes@782
   242
    gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@782
   243
    
nkeynes@782
   244
    memcpy( buf, sector_data+start, size );
nkeynes@782
   245
    *length = size;
nkeynes@782
   246
}
nkeynes@782
   247
nkeynes@644
   248
/**
nkeynes@644
   249
 * Read a single sector from a disc image. If you thought this would be simple, 
nkeynes@644
   250
 * I have just one thing to say to you: Bwahahahahahahahah.
nkeynes@644
   251
 *
nkeynes@644
   252
 * Once we've decided that there's a real sector at the requested lba, there's 
nkeynes@644
   253
 * really two things we need to care about:
nkeynes@644
   254
 *   1. Is the sector mode compatible with the requested read mode
nkeynes@644
   255
 *   2. Which parts of the sector do we need to return? 
nkeynes@644
   256
 *      (header/subhead/data/raw sector)
nkeynes@644
   257
 *
nkeynes@644
   258
 * Also note that the disc image may supply us with just the data (most common 
nkeynes@644
   259
 * case), or may have the full raw sector. In the former case we may need to 
nkeynes@644
   260
 * generate the missing data on the fly, for which we use libedc to compute the
nkeynes@644
   261
 * data correction codes.
nkeynes@644
   262
 */
nkeynes@342
   263
static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
nkeynes@736
   264
                                              int mode, unsigned char *buf, uint32_t *length )
nkeynes@342
   265
{
nkeynes@342
   266
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@498
   267
    struct cdrom_sector_header secthead;
nkeynes@422
   268
    int file_offset, read_len, track_no;
nkeynes@498
   269
nkeynes@492
   270
    FILE *f;
nkeynes@342
   271
nkeynes@342
   272
    track_no = gdrom_image_get_track_by_lba( image, lba );
nkeynes@342
   273
    if( track_no == -1 ) {
nkeynes@736
   274
        return PKT_ERR_BADREAD;
nkeynes@342
   275
    }
nkeynes@342
   276
    struct gdrom_track *track = &image->track[track_no-1];
nkeynes@342
   277
    file_offset = track->offset + track->sector_size * (lba - track->lba);
nkeynes@342
   278
    read_len = track->sector_size;
nkeynes@492
   279
    if( track->file != NULL ) {
nkeynes@736
   280
        f = track->file;
nkeynes@492
   281
    } else {
nkeynes@736
   282
        f = image->file;
nkeynes@492
   283
    }
nkeynes@492
   284
nkeynes@644
   285
    /* First figure out what the real sector mode is for raw/semiraw sectors */
nkeynes@644
   286
    int sector_mode;
nkeynes@644
   287
    switch( track->mode ) {
nkeynes@644
   288
    case GDROM_RAW_NONXA:
nkeynes@736
   289
        gdrom_read_block( (unsigned char *)(&secthead), file_offset, sizeof(secthead), f );
nkeynes@736
   290
        sector_mode = (secthead.mode == 1) ? GDROM_MODE1 : GDROM_MODE2_FORMLESS;
nkeynes@736
   291
        break;
nkeynes@644
   292
    case GDROM_RAW_XA:
nkeynes@736
   293
        gdrom_read_block( (unsigned char *)(&secthead), file_offset, sizeof(secthead), f );
nkeynes@736
   294
        if( secthead.mode == 1 ) {
nkeynes@736
   295
            sector_mode = GDROM_MODE1;
nkeynes@736
   296
        } else {
nkeynes@736
   297
            sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
nkeynes@736
   298
        }
nkeynes@736
   299
        break;
nkeynes@644
   300
    case GDROM_SEMIRAW_MODE2:
nkeynes@736
   301
        gdrom_read_block( secthead.subhead, file_offset, 8, f );
nkeynes@736
   302
        sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
nkeynes@736
   303
        break;
nkeynes@342
   304
    default:
nkeynes@736
   305
        /* In the other cases, the track mode completely defines the sector mode */
nkeynes@736
   306
        sector_mode = track->mode;
nkeynes@736
   307
        break;
nkeynes@644
   308
    }
nkeynes@644
   309
nkeynes@644
   310
    if( !gdrom_is_compatible_read_mode(sector_mode, READ_CD_MODE(mode)) ) {
nkeynes@736
   311
        return PKT_ERR_BADREADMODE;
nkeynes@342
   312
    }
nkeynes@644
   313
nkeynes@644
   314
    /* Ok, we've got a valid sector, check what parts of the sector we need to
nkeynes@644
   315
     * return - header | subhead | data | everything
nkeynes@644
   316
     */
nkeynes@644
   317
    int channels = READ_CD_CHANNELS(mode);
nkeynes@644
   318
nkeynes@644
   319
    if( channels == 0 ) {
nkeynes@736
   320
        // legal, if weird
nkeynes@736
   321
        *length = 0;
nkeynes@736
   322
        return PKT_ERR_OK;
nkeynes@644
   323
    } else if( channels == 0xA0 && 
nkeynes@736
   324
            (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2 )) {
nkeynes@736
   325
        // caller requested a non-contiguous region
nkeynes@736
   326
        return PKT_ERR_BADFIELD;
nkeynes@644
   327
    } else if( READ_CD_RAW(channels) ) {
nkeynes@736
   328
        channels = 0xF0; // implies everything
nkeynes@644
   329
    }
nkeynes@644
   330
nkeynes@644
   331
    read_len = 0;
nkeynes@644
   332
    int start, size;
nkeynes@644
   333
    switch( track->mode ) {
nkeynes@644
   334
    case GDROM_CDDA:
nkeynes@736
   335
        // audio is nice and simple (assume perfect reads for now)
nkeynes@736
   336
        *length = 2352;
nkeynes@736
   337
        gdrom_read_block( buf, file_offset, track->sector_size, f );
nkeynes@736
   338
        return PKT_ERR_OK;
nkeynes@644
   339
    case GDROM_RAW_XA:
nkeynes@644
   340
    case GDROM_RAW_NONXA:
nkeynes@736
   341
        gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@736
   342
        gdrom_read_block( buf, file_offset+start, size, f );
nkeynes@736
   343
        read_len = size;
nkeynes@736
   344
        break;
nkeynes@644
   345
    case GDROM_SEMIRAW_MODE2:
nkeynes@736
   346
        gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@736
   347
        if( READ_CD_HEADER(channels) ) {
nkeynes@736
   348
            gdrom_build_sector_header( buf, lba, sector_mode );
nkeynes@736
   349
            read_len += SECTOR_HEADER_SIZE;
nkeynes@736
   350
            size -= SECTOR_HEADER_SIZE;
nkeynes@736
   351
        } else {
nkeynes@736
   352
            start -= SECTOR_HEADER_SIZE;
nkeynes@736
   353
        }
nkeynes@736
   354
        gdrom_read_block( buf + read_len, file_offset+start, size, f );
nkeynes@736
   355
        read_len += size;
nkeynes@736
   356
        break;
nkeynes@644
   357
    default: // Data track w/ data only in file
nkeynes@736
   358
        if( READ_CD_RAW(channels) ) {
nkeynes@736
   359
            gdrom_read_block( buf + gdrom_data_offset[track->mode], file_offset, 
nkeynes@736
   360
                    track->sector_size, f );
nkeynes@736
   361
            do_encode_L2( buf, sector_mode, lba );
nkeynes@736
   362
            read_len = 2352;
nkeynes@736
   363
        } else {
nkeynes@736
   364
            if( READ_CD_HEADER(channels) ) {
nkeynes@736
   365
                gdrom_build_sector_header( buf, lba, sector_mode );
nkeynes@736
   366
                read_len += SECTOR_HEADER_SIZE;
nkeynes@736
   367
            }
nkeynes@736
   368
            if( READ_CD_SUBHEAD(channels) && 
nkeynes@736
   369
                    (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
nkeynes@736
   370
                if( sector_mode == GDROM_MODE2_FORM1 ) {
nkeynes@736
   371
                    *((uint32_t *)(buf+read_len)) = 0;
nkeynes@736
   372
                    *((uint32_t *)(buf+read_len+4)) = 0;
nkeynes@736
   373
                } else {
nkeynes@736
   374
                    *((uint32_t *)(buf+read_len)) = 0x00200000;
nkeynes@736
   375
                    *((uint32_t *)(buf+read_len+4)) = 0x00200000;
nkeynes@736
   376
                }
nkeynes@736
   377
                read_len += 8;
nkeynes@736
   378
            }
nkeynes@736
   379
            if( READ_CD_DATA(channels) ) {
nkeynes@736
   380
                gdrom_read_block( buf+read_len, file_offset, track->sector_size, f );
nkeynes@736
   381
                read_len += track->sector_size;
nkeynes@736
   382
            }
nkeynes@736
   383
        }
nkeynes@644
   384
    }
nkeynes@342
   385
    *length = read_len;
nkeynes@342
   386
    return PKT_ERR_OK;
nkeynes@342
   387
}
nkeynes@342
   388
nkeynes@422
   389
static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf ) 
nkeynes@342
   390
{
nkeynes@342
   391
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   392
    struct gdrom_toc *toc = (struct gdrom_toc *)buf;
nkeynes@342
   393
    int i;
nkeynes@342
   394
nkeynes@342
   395
    for( i=0; i<image->track_count; i++ ) {
nkeynes@736
   396
        toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
nkeynes@342
   397
    }
nkeynes@342
   398
    toc->first = 0x0100 | image->track[0].flags;
nkeynes@342
   399
    toc->last = (image->track_count<<8) | image->track[i-1].flags;
nkeynes@342
   400
    toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
nkeynes@736
   401
    image->track[i-1].flags;
nkeynes@342
   402
    for( ;i<99; i++ )
nkeynes@736
   403
        toc->track[i] = 0xFFFFFFFF;
nkeynes@342
   404
    return PKT_ERR_OK;
nkeynes@342
   405
}
nkeynes@342
   406
nkeynes@422
   407
static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf )
nkeynes@342
   408
{
nkeynes@342
   409
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   410
    struct gdrom_track *last_track = &image->track[image->track_count-1];
nkeynes@342
   411
    unsigned int end_of_disc = last_track->lba + last_track->sector_count;
nkeynes@342
   412
    int i;
nkeynes@342
   413
    buf[0] = 0x01; /* Disc status? */
nkeynes@342
   414
    buf[1] = 0;
nkeynes@342
   415
nkeynes@342
   416
    if( session == 0 ) {
nkeynes@736
   417
        buf[2] = last_track->session+1; /* last session */
nkeynes@736
   418
        buf[3] = (end_of_disc >> 16) & 0xFF;
nkeynes@736
   419
        buf[4] = (end_of_disc >> 8) & 0xFF;
nkeynes@736
   420
        buf[5] = end_of_disc & 0xFF;
nkeynes@736
   421
        return PKT_ERR_OK;
nkeynes@342
   422
    } else {
nkeynes@736
   423
        session--;
nkeynes@736
   424
        for( i=0; i<image->track_count; i++ ) {
nkeynes@736
   425
            if( image->track[i].session == session ) {
nkeynes@736
   426
                buf[2] = i+1; /* first track of session */
nkeynes@736
   427
                buf[3] = (image->track[i].lba >> 16) & 0xFF;
nkeynes@736
   428
                buf[4] = (image->track[i].lba >> 8) & 0xFF;
nkeynes@736
   429
                buf[5] = image->track[i].lba & 0xFF;
nkeynes@736
   430
                return PKT_ERR_OK;
nkeynes@736
   431
            }
nkeynes@736
   432
        }
nkeynes@736
   433
        return PKT_ERR_BADFIELD; /* No such session */
nkeynes@342
   434
    }
nkeynes@342
   435
}
nkeynes@342
   436
nkeynes@422
   437
static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf )
nkeynes@342
   438
{
nkeynes@342
   439
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   440
    int track_no = gdrom_image_get_track_by_lba( image, lba );
nkeynes@342
   441
    if( track_no == -1 ) {
nkeynes@736
   442
        track_no = 1;
nkeynes@736
   443
        lba = 150;
nkeynes@342
   444
    }
nkeynes@342
   445
    struct gdrom_track *track = &image->track[track_no-1];
nkeynes@342
   446
    uint32_t offset = lba - track->lba;
nkeynes@342
   447
    buf[4] = track->flags;
nkeynes@342
   448
    buf[5] = track_no;
nkeynes@342
   449
    buf[6] = 0x01; /* ?? */
nkeynes@342
   450
    buf[7] = (offset >> 16) & 0xFF;
nkeynes@342
   451
    buf[8] = (offset >> 8) & 0xFF;
nkeynes@342
   452
    buf[9] = offset & 0xFF;
nkeynes@342
   453
    buf[10] = 0;
nkeynes@342
   454
    buf[11] = (lba >> 16) & 0xFF;
nkeynes@342
   455
    buf[12] = (lba >> 8) & 0xFF;
nkeynes@342
   456
    buf[13] = lba & 0xFF;
nkeynes@422
   457
    return PKT_ERR_OK;
nkeynes@342
   458
}
nkeynes@342
   459
nkeynes@342
   460
static int gdrom_image_drive_status( gdrom_disc_t disc ) 
nkeynes@342
   461
{
nkeynes@342
   462
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@720
   463
    if( image->disc_type == IDE_DISC_NONE ) {
nkeynes@720
   464
        return IDE_DISC_NONE;
nkeynes@720
   465
    } else {
nkeynes@720
   466
        return image->disc_type | IDE_DISC_READY;
nkeynes@720
   467
    }
nkeynes@342
   468
}
nkeynes@342
   469
nkeynes@342
   470
void gdrom_image_dump_info( gdrom_disc_t d ) {
nkeynes@342
   471
    gdrom_image_t disc = (gdrom_image_t)d;
nkeynes@342
   472
    int i;
nkeynes@342
   473
    int last_session = disc->track[disc->track_count-1].session;
nkeynes@342
   474
    gboolean is_bootable = FALSE;
nkeynes@342
   475
nkeynes@342
   476
    INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, 
nkeynes@736
   477
          disc->track[disc->track_count-1].session + 1 );
nkeynes@342
   478
    if( last_session > 0 ) {
nkeynes@736
   479
        /* Boot track is the first data track of the last session, provided that it 
nkeynes@736
   480
         * cannot be a single-session disc.
nkeynes@736
   481
         */
nkeynes@736
   482
        int boot_track = -1;
nkeynes@736
   483
        for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
nkeynes@736
   484
            if( disc->track[i].flags & TRACK_DATA ) {
nkeynes@736
   485
                boot_track = i;
nkeynes@736
   486
            }
nkeynes@736
   487
        }
nkeynes@736
   488
        if( boot_track != -1 ) {
nkeynes@736
   489
            unsigned char boot_sector[MAX_SECTOR_SIZE];
nkeynes@736
   490
            uint32_t length = sizeof(boot_sector);
nkeynes@736
   491
            if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
nkeynes@736
   492
                    boot_sector, &length ) == PKT_ERR_OK ) {
nkeynes@736
   493
                bootstrap_dump(boot_sector, FALSE);
nkeynes@736
   494
                is_bootable = TRUE;
nkeynes@736
   495
            }
nkeynes@736
   496
        }
nkeynes@342
   497
    }
nkeynes@342
   498
    if( !is_bootable ) {
nkeynes@736
   499
        WARN( "Disc does not appear to be bootable" );
nkeynes@342
   500
    }
nkeynes@342
   501
}
nkeynes@342
   502
nkeynes@709
   503
gdrom_device_t gdrom_device_new( const gchar *name, const gchar *dev_name )
nkeynes@709
   504
{
nkeynes@709
   505
    struct gdrom_device *dev = g_malloc0( sizeof(struct gdrom_device) );
nkeynes@709
   506
    dev->name = g_strdup(name);
nkeynes@709
   507
    dev->device_name = g_strdup(dev_name);
nkeynes@709
   508
    return dev;
nkeynes@709
   509
}
nkeynes@709
   510
nkeynes@709
   511
void gdrom_device_destroy( gdrom_device_t dev )
nkeynes@709
   512
{
nkeynes@709
   513
    if( dev->name != NULL ) {
nkeynes@709
   514
        g_free( dev->name );
nkeynes@709
   515
        dev->name = NULL;
nkeynes@709
   516
    }
nkeynes@709
   517
    if( dev->device_name != NULL ) {
nkeynes@709
   518
        g_free( dev->device_name );
nkeynes@709
   519
        dev->device_name = NULL;
nkeynes@709
   520
    }
nkeynes@709
   521
    g_free( dev );
nkeynes@709
   522
}
.