Search
lxdream.org :: lxdream/src/gdrom/gdimage.c
lxdream 0.9.1
released Jun 29
Download Now
filename src/gdrom/gdimage.c
changeset 759:f16975739abc
prev736:a02d1475ccfd
next782:1af8b5ce627c
author nkeynes
date Mon Jul 21 01:01:39 2008 +0000 (14 years ago)
permissions -rw-r--r--
last change Fix batch of -Wall warnings
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@422
    22
#include <netinet/in.h>
nkeynes@422
    23
nkeynes@678
    24
#include "gdrom/gddriver.h"
nkeynes@342
    25
#include "gdrom/packet.h"
nkeynes@644
    26
#include "ecc.h"
nkeynes@422
    27
#include "bootstrap.h"
nkeynes@342
    28
nkeynes@342
    29
static void gdrom_image_destroy( gdrom_disc_t disc );
nkeynes@342
    30
static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode, 
nkeynes@736
    31
                                              unsigned char *buf, uint32_t *readlength );
nkeynes@422
    32
static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf );
nkeynes@422
    33
static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf );
nkeynes@422
    34
static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf );
nkeynes@342
    35
static int gdrom_image_drive_status( gdrom_disc_t disc );
nkeynes@342
    36
nkeynes@644
    37
static uint8_t gdrom_default_sync[12] = { 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0 };
nkeynes@644
    38
nkeynes@644
    39
#define SECTOR_HEADER_SIZE 16
nkeynes@644
    40
#define SECTOR_SUBHEADER_SIZE 8
nkeynes@644
    41
nkeynes@644
    42
/* Data offset (from start of raw sector) by sector mode */
nkeynes@644
    43
static int gdrom_data_offset[] = { 16, 16, 16, 24, 24, 0, 8, 0, 0 };
nkeynes@644
    44
nkeynes@644
    45
nkeynes@644
    46
nkeynes@498
    47
struct cdrom_sector_header {
nkeynes@498
    48
    uint8_t sync[12];
nkeynes@498
    49
    uint8_t msf[3];
nkeynes@498
    50
    uint8_t mode;
nkeynes@644
    51
    uint8_t subhead[8]; // Mode-2 XA sectors only
nkeynes@498
    52
};
nkeynes@342
    53
nkeynes@342
    54
/**
nkeynes@342
    55
 * Initialize a gdrom_disc structure with the gdrom_image_* methods
nkeynes@342
    56
 */
nkeynes@342
    57
void gdrom_image_init( gdrom_disc_t disc )
nkeynes@342
    58
{
nkeynes@342
    59
    memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
nkeynes@342
    60
    disc->read_sector = gdrom_image_read_sector;
nkeynes@342
    61
    disc->read_toc = gdrom_image_read_toc;
nkeynes@342
    62
    disc->read_session = gdrom_image_read_session;
nkeynes@342
    63
    disc->read_position = gdrom_image_read_position;
nkeynes@342
    64
    disc->drive_status = gdrom_image_drive_status;
nkeynes@342
    65
    disc->play_audio = NULL; /* not supported yet */
nkeynes@342
    66
    disc->run_time_slice = NULL; /* not needed */
nkeynes@342
    67
    disc->close = gdrom_image_destroy;
nkeynes@342
    68
}
nkeynes@342
    69
nkeynes@464
    70
gdrom_disc_t gdrom_image_new( const gchar *filename, FILE *f )
nkeynes@342
    71
{
nkeynes@736
    72
    gdrom_image_t image = (gdrom_image_t)g_malloc0(sizeof(struct gdrom_image));
nkeynes@342
    73
    if( image == NULL ) {
nkeynes@736
    74
        return NULL;
nkeynes@342
    75
    }
nkeynes@644
    76
    image->disc_type = IDE_DISC_CDROMXA;
nkeynes@342
    77
    image->file = f;
nkeynes@342
    78
    gdrom_disc_t disc = (gdrom_disc_t)image;
nkeynes@342
    79
    gdrom_image_init(disc);
nkeynes@464
    80
    if( filename == NULL ) {
nkeynes@736
    81
        disc->name = NULL;
nkeynes@464
    82
    } else {
nkeynes@736
    83
        disc->name = g_strdup(filename);
nkeynes@464
    84
    }
nkeynes@464
    85
nkeynes@342
    86
    return disc;
nkeynes@342
    87
}
nkeynes@342
    88
nkeynes@342
    89
static void gdrom_image_destroy( gdrom_disc_t disc )
nkeynes@342
    90
{
nkeynes@492
    91
    int i;
nkeynes@492
    92
    FILE *lastfile = NULL;
nkeynes@342
    93
    gdrom_image_t img = (gdrom_image_t)disc;
nkeynes@342
    94
    if( img->file != NULL ) {
nkeynes@736
    95
        fclose(img->file);
nkeynes@736
    96
        img->file = NULL;
nkeynes@342
    97
    }
nkeynes@492
    98
    for( i=0; i<img->track_count; i++ ) {
nkeynes@736
    99
        if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
nkeynes@736
   100
            lastfile = img->track[i].file;
nkeynes@736
   101
            fclose(lastfile);
nkeynes@736
   102
            img->track[i].file = NULL;
nkeynes@736
   103
        }
nkeynes@492
   104
    }
nkeynes@464
   105
    if( disc->name != NULL ) {
nkeynes@736
   106
        g_free( (gpointer)disc->name );
nkeynes@736
   107
        disc->name = NULL;
nkeynes@464
   108
    }
nkeynes@342
   109
    free( disc );
nkeynes@342
   110
}
nkeynes@342
   111
nkeynes@468
   112
void gdrom_image_destroy_no_close( gdrom_disc_t disc )
nkeynes@468
   113
{
nkeynes@492
   114
    int i;
nkeynes@492
   115
    FILE *lastfile = NULL;
nkeynes@468
   116
    gdrom_image_t img = (gdrom_image_t)disc;
nkeynes@468
   117
    if( img->file != NULL ) {
nkeynes@736
   118
        img->file = NULL;
nkeynes@468
   119
    }
nkeynes@492
   120
    for( i=0; i<img->track_count; i++ ) {
nkeynes@736
   121
        if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
nkeynes@736
   122
            lastfile = img->track[i].file;
nkeynes@736
   123
            fclose(lastfile);
nkeynes@736
   124
            img->track[i].file = NULL;
nkeynes@736
   125
        }
nkeynes@492
   126
    }
nkeynes@468
   127
    if( disc->name != NULL ) {
nkeynes@736
   128
        g_free( (gpointer)disc->name );
nkeynes@736
   129
        disc->name = NULL;
nkeynes@468
   130
    }
nkeynes@468
   131
    free( disc );
nkeynes@468
   132
}
nkeynes@468
   133
nkeynes@342
   134
static int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
nkeynes@342
   135
{
nkeynes@342
   136
    int i;
nkeynes@342
   137
    for( i=0; i<image->track_count; i++ ) {
nkeynes@736
   138
        if( image->track[i].lba <= lba && 
nkeynes@736
   139
                lba < (image->track[i].lba + image->track[i].sector_count) ) {
nkeynes@736
   140
            return i+1;
nkeynes@736
   141
        }
nkeynes@342
   142
    }
nkeynes@342
   143
    return -1;
nkeynes@342
   144
}
nkeynes@342
   145
nkeynes@492
   146
/**
nkeynes@492
   147
 * Read a block from an image file, handling negative file offsets
nkeynes@492
   148
 * with 0-fill.
nkeynes@492
   149
 */
nkeynes@644
   150
static gboolean gdrom_read_block( unsigned char *buf, int file_offset, int length, FILE *f )
nkeynes@492
   151
{
nkeynes@492
   152
    if( file_offset < 0 ) {
nkeynes@736
   153
        int size = -file_offset;
nkeynes@736
   154
        if( size >= length ) {
nkeynes@736
   155
            memset( buf, 0, length );
nkeynes@736
   156
            return TRUE;
nkeynes@736
   157
        } else {
nkeynes@736
   158
            memset( buf, 0, size );
nkeynes@736
   159
            file_offset = 0;
nkeynes@736
   160
            length -= size;
nkeynes@736
   161
        }
nkeynes@492
   162
    }
nkeynes@492
   163
    fseek( f, file_offset, SEEK_SET );
nkeynes@644
   164
    return fread( buf, length, 1, f ) == 1;
nkeynes@492
   165
}
nkeynes@492
   166
nkeynes@644
   167
static void gdrom_build_sector_header( unsigned char *buf, uint32_t lba, 
nkeynes@736
   168
                                       gdrom_track_mode_t sector_mode )
nkeynes@644
   169
{
nkeynes@644
   170
    memcpy( buf, gdrom_default_sync, 12 );
nkeynes@644
   171
    cd_build_address( buf, sector_mode, lba );
nkeynes@644
   172
}
nkeynes@644
   173
nkeynes@644
   174
/**
nkeynes@644
   175
 * Return TRUE if the given read mode + track modes are compatible,
nkeynes@644
   176
 * otherwise FALSE.
nkeynes@644
   177
 * @param track_mode one of the GDROM_MODE* constants
nkeynes@644
   178
 * @param read_mode the READ_CD_MODE from the read request
nkeynes@644
   179
 */
nkeynes@644
   180
static gboolean gdrom_is_compatible_read_mode( int track_mode, int read_mode )
nkeynes@644
   181
{
nkeynes@644
   182
    switch( read_mode ) {
nkeynes@644
   183
    case READ_CD_MODE_ANY:
nkeynes@736
   184
        return TRUE;
nkeynes@644
   185
    case READ_CD_MODE_CDDA:
nkeynes@736
   186
        return track_mode == GDROM_CDDA;
nkeynes@644
   187
    case READ_CD_MODE_1:
nkeynes@736
   188
        return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1;
nkeynes@644
   189
    case READ_CD_MODE_2_FORM_1:
nkeynes@736
   190
        return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1;
nkeynes@644
   191
    case READ_CD_MODE_2_FORM_2:
nkeynes@736
   192
        return track_mode == GDROM_MODE2_FORM2;
nkeynes@644
   193
    case READ_CD_MODE_2:
nkeynes@736
   194
        return track_mode == GDROM_MODE2_FORMLESS;
nkeynes@644
   195
    default:
nkeynes@736
   196
        return FALSE;
nkeynes@644
   197
    }
nkeynes@644
   198
}
nkeynes@644
   199
nkeynes@644
   200
/**
nkeynes@644
   201
 * Determine the start position in a raw sector, and the amount of data to read
nkeynes@644
   202
 * in bytes, for a given combination of sector mode and read mode.
nkeynes@644
   203
 */ 
nkeynes@644
   204
static void gdrom_get_read_bounds( int sector_mode, int read_mode, int *start, int *size )
nkeynes@644
   205
{
nkeynes@644
   206
    if( READ_CD_RAW(read_mode) ) {
nkeynes@736
   207
        // whole sector
nkeynes@736
   208
        *start = 0;
nkeynes@736
   209
        *size = 2352;
nkeynes@644
   210
    } else {
nkeynes@736
   211
        *size = 0;
nkeynes@736
   212
        if( READ_CD_DATA(read_mode) ) {
nkeynes@736
   213
            *start = gdrom_data_offset[sector_mode];
nkeynes@736
   214
            *size = gdrom_sector_size[sector_mode];
nkeynes@736
   215
        }
nkeynes@644
   216
nkeynes@736
   217
        if( READ_CD_SUBHEAD(read_mode) && 
nkeynes@736
   218
                (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
nkeynes@736
   219
            *start = SECTOR_HEADER_SIZE;
nkeynes@736
   220
            *size += SECTOR_SUBHEADER_SIZE;
nkeynes@736
   221
        }
nkeynes@644
   222
nkeynes@736
   223
        if( READ_CD_HEADER(read_mode) ) {
nkeynes@736
   224
            *size += SECTOR_HEADER_SIZE;
nkeynes@736
   225
            *start = 0;
nkeynes@736
   226
        }
nkeynes@644
   227
nkeynes@644
   228
    }
nkeynes@644
   229
}
nkeynes@644
   230
nkeynes@644
   231
/**
nkeynes@644
   232
 * Read a single sector from a disc image. If you thought this would be simple, 
nkeynes@644
   233
 * I have just one thing to say to you: Bwahahahahahahahah.
nkeynes@644
   234
 *
nkeynes@644
   235
 * Once we've decided that there's a real sector at the requested lba, there's 
nkeynes@644
   236
 * really two things we need to care about:
nkeynes@644
   237
 *   1. Is the sector mode compatible with the requested read mode
nkeynes@644
   238
 *   2. Which parts of the sector do we need to return? 
nkeynes@644
   239
 *      (header/subhead/data/raw sector)
nkeynes@644
   240
 *
nkeynes@644
   241
 * Also note that the disc image may supply us with just the data (most common 
nkeynes@644
   242
 * case), or may have the full raw sector. In the former case we may need to 
nkeynes@644
   243
 * generate the missing data on the fly, for which we use libedc to compute the
nkeynes@644
   244
 * data correction codes.
nkeynes@644
   245
 */
nkeynes@342
   246
static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
nkeynes@736
   247
                                              int mode, unsigned char *buf, uint32_t *length )
nkeynes@342
   248
{
nkeynes@342
   249
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@498
   250
    struct cdrom_sector_header secthead;
nkeynes@422
   251
    int file_offset, read_len, track_no;
nkeynes@498
   252
nkeynes@492
   253
    FILE *f;
nkeynes@342
   254
nkeynes@342
   255
    track_no = gdrom_image_get_track_by_lba( image, lba );
nkeynes@342
   256
    if( track_no == -1 ) {
nkeynes@736
   257
        return PKT_ERR_BADREAD;
nkeynes@342
   258
    }
nkeynes@342
   259
    struct gdrom_track *track = &image->track[track_no-1];
nkeynes@342
   260
    file_offset = track->offset + track->sector_size * (lba - track->lba);
nkeynes@342
   261
    read_len = track->sector_size;
nkeynes@492
   262
    if( track->file != NULL ) {
nkeynes@736
   263
        f = track->file;
nkeynes@492
   264
    } else {
nkeynes@736
   265
        f = image->file;
nkeynes@492
   266
    }
nkeynes@492
   267
nkeynes@644
   268
    /* First figure out what the real sector mode is for raw/semiraw sectors */
nkeynes@644
   269
    int sector_mode;
nkeynes@644
   270
    switch( track->mode ) {
nkeynes@644
   271
    case GDROM_RAW_NONXA:
nkeynes@736
   272
        gdrom_read_block( (unsigned char *)(&secthead), file_offset, sizeof(secthead), f );
nkeynes@736
   273
        sector_mode = (secthead.mode == 1) ? GDROM_MODE1 : GDROM_MODE2_FORMLESS;
nkeynes@736
   274
        break;
nkeynes@644
   275
    case GDROM_RAW_XA:
nkeynes@736
   276
        gdrom_read_block( (unsigned char *)(&secthead), file_offset, sizeof(secthead), f );
nkeynes@736
   277
        if( secthead.mode == 1 ) {
nkeynes@736
   278
            sector_mode = GDROM_MODE1;
nkeynes@736
   279
        } else {
nkeynes@736
   280
            sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
nkeynes@736
   281
        }
nkeynes@736
   282
        break;
nkeynes@644
   283
    case GDROM_SEMIRAW_MODE2:
nkeynes@736
   284
        gdrom_read_block( secthead.subhead, file_offset, 8, f );
nkeynes@736
   285
        sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
nkeynes@736
   286
        break;
nkeynes@342
   287
    default:
nkeynes@736
   288
        /* In the other cases, the track mode completely defines the sector mode */
nkeynes@736
   289
        sector_mode = track->mode;
nkeynes@736
   290
        break;
nkeynes@644
   291
    }
nkeynes@644
   292
nkeynes@644
   293
    if( !gdrom_is_compatible_read_mode(sector_mode, READ_CD_MODE(mode)) ) {
nkeynes@736
   294
        return PKT_ERR_BADREADMODE;
nkeynes@342
   295
    }
nkeynes@644
   296
nkeynes@644
   297
    /* Ok, we've got a valid sector, check what parts of the sector we need to
nkeynes@644
   298
     * return - header | subhead | data | everything
nkeynes@644
   299
     */
nkeynes@644
   300
    int channels = READ_CD_CHANNELS(mode);
nkeynes@644
   301
nkeynes@644
   302
    if( channels == 0 ) {
nkeynes@736
   303
        // legal, if weird
nkeynes@736
   304
        *length = 0;
nkeynes@736
   305
        return PKT_ERR_OK;
nkeynes@644
   306
    } else if( channels == 0xA0 && 
nkeynes@736
   307
            (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2 )) {
nkeynes@736
   308
        // caller requested a non-contiguous region
nkeynes@736
   309
        return PKT_ERR_BADFIELD;
nkeynes@644
   310
    } else if( READ_CD_RAW(channels) ) {
nkeynes@736
   311
        channels = 0xF0; // implies everything
nkeynes@644
   312
    }
nkeynes@644
   313
nkeynes@644
   314
    read_len = 0;
nkeynes@644
   315
    int start, size;
nkeynes@644
   316
    switch( track->mode ) {
nkeynes@644
   317
    case GDROM_CDDA:
nkeynes@736
   318
        // audio is nice and simple (assume perfect reads for now)
nkeynes@736
   319
        *length = 2352;
nkeynes@736
   320
        gdrom_read_block( buf, file_offset, track->sector_size, f );
nkeynes@736
   321
        return PKT_ERR_OK;
nkeynes@644
   322
    case GDROM_RAW_XA:
nkeynes@644
   323
    case GDROM_RAW_NONXA:
nkeynes@736
   324
        gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@736
   325
        gdrom_read_block( buf, file_offset+start, size, f );
nkeynes@736
   326
        read_len = size;
nkeynes@736
   327
        break;
nkeynes@644
   328
    case GDROM_SEMIRAW_MODE2:
nkeynes@736
   329
        gdrom_get_read_bounds( sector_mode, channels, &start, &size );
nkeynes@736
   330
        if( READ_CD_HEADER(channels) ) {
nkeynes@736
   331
            gdrom_build_sector_header( buf, lba, sector_mode );
nkeynes@736
   332
            read_len += SECTOR_HEADER_SIZE;
nkeynes@736
   333
            size -= SECTOR_HEADER_SIZE;
nkeynes@736
   334
        } else {
nkeynes@736
   335
            start -= SECTOR_HEADER_SIZE;
nkeynes@736
   336
        }
nkeynes@736
   337
        gdrom_read_block( buf + read_len, file_offset+start, size, f );
nkeynes@736
   338
        read_len += size;
nkeynes@736
   339
        break;
nkeynes@644
   340
    default: // Data track w/ data only in file
nkeynes@736
   341
        if( READ_CD_RAW(channels) ) {
nkeynes@736
   342
            gdrom_read_block( buf + gdrom_data_offset[track->mode], file_offset, 
nkeynes@736
   343
                    track->sector_size, f );
nkeynes@736
   344
            do_encode_L2( buf, sector_mode, lba );
nkeynes@736
   345
            read_len = 2352;
nkeynes@736
   346
        } else {
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
            }
nkeynes@736
   351
            if( READ_CD_SUBHEAD(channels) && 
nkeynes@736
   352
                    (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
nkeynes@736
   353
                if( sector_mode == GDROM_MODE2_FORM1 ) {
nkeynes@736
   354
                    *((uint32_t *)(buf+read_len)) = 0;
nkeynes@736
   355
                    *((uint32_t *)(buf+read_len+4)) = 0;
nkeynes@736
   356
                } else {
nkeynes@736
   357
                    *((uint32_t *)(buf+read_len)) = 0x00200000;
nkeynes@736
   358
                    *((uint32_t *)(buf+read_len+4)) = 0x00200000;
nkeynes@736
   359
                }
nkeynes@736
   360
                read_len += 8;
nkeynes@736
   361
            }
nkeynes@736
   362
            if( READ_CD_DATA(channels) ) {
nkeynes@736
   363
                gdrom_read_block( buf+read_len, file_offset, track->sector_size, f );
nkeynes@736
   364
                read_len += track->sector_size;
nkeynes@736
   365
            }
nkeynes@736
   366
        }
nkeynes@644
   367
    }
nkeynes@342
   368
    *length = read_len;
nkeynes@342
   369
    return PKT_ERR_OK;
nkeynes@342
   370
}
nkeynes@342
   371
nkeynes@422
   372
static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf ) 
nkeynes@342
   373
{
nkeynes@342
   374
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   375
    struct gdrom_toc *toc = (struct gdrom_toc *)buf;
nkeynes@342
   376
    int i;
nkeynes@342
   377
nkeynes@342
   378
    for( i=0; i<image->track_count; i++ ) {
nkeynes@736
   379
        toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
nkeynes@342
   380
    }
nkeynes@342
   381
    toc->first = 0x0100 | image->track[0].flags;
nkeynes@342
   382
    toc->last = (image->track_count<<8) | image->track[i-1].flags;
nkeynes@342
   383
    toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
nkeynes@736
   384
    image->track[i-1].flags;
nkeynes@342
   385
    for( ;i<99; i++ )
nkeynes@736
   386
        toc->track[i] = 0xFFFFFFFF;
nkeynes@342
   387
    return PKT_ERR_OK;
nkeynes@342
   388
}
nkeynes@342
   389
nkeynes@422
   390
static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf )
nkeynes@342
   391
{
nkeynes@342
   392
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   393
    struct gdrom_track *last_track = &image->track[image->track_count-1];
nkeynes@342
   394
    unsigned int end_of_disc = last_track->lba + last_track->sector_count;
nkeynes@342
   395
    int i;
nkeynes@342
   396
    buf[0] = 0x01; /* Disc status? */
nkeynes@342
   397
    buf[1] = 0;
nkeynes@342
   398
nkeynes@342
   399
    if( session == 0 ) {
nkeynes@736
   400
        buf[2] = last_track->session+1; /* last session */
nkeynes@736
   401
        buf[3] = (end_of_disc >> 16) & 0xFF;
nkeynes@736
   402
        buf[4] = (end_of_disc >> 8) & 0xFF;
nkeynes@736
   403
        buf[5] = end_of_disc & 0xFF;
nkeynes@736
   404
        return PKT_ERR_OK;
nkeynes@342
   405
    } else {
nkeynes@736
   406
        session--;
nkeynes@736
   407
        for( i=0; i<image->track_count; i++ ) {
nkeynes@736
   408
            if( image->track[i].session == session ) {
nkeynes@736
   409
                buf[2] = i+1; /* first track of session */
nkeynes@736
   410
                buf[3] = (image->track[i].lba >> 16) & 0xFF;
nkeynes@736
   411
                buf[4] = (image->track[i].lba >> 8) & 0xFF;
nkeynes@736
   412
                buf[5] = image->track[i].lba & 0xFF;
nkeynes@736
   413
                return PKT_ERR_OK;
nkeynes@736
   414
            }
nkeynes@736
   415
        }
nkeynes@736
   416
        return PKT_ERR_BADFIELD; /* No such session */
nkeynes@342
   417
    }
nkeynes@342
   418
}
nkeynes@342
   419
nkeynes@422
   420
static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf )
nkeynes@342
   421
{
nkeynes@342
   422
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@342
   423
    int track_no = gdrom_image_get_track_by_lba( image, lba );
nkeynes@342
   424
    if( track_no == -1 ) {
nkeynes@736
   425
        track_no = 1;
nkeynes@736
   426
        lba = 150;
nkeynes@342
   427
    }
nkeynes@342
   428
    struct gdrom_track *track = &image->track[track_no-1];
nkeynes@342
   429
    uint32_t offset = lba - track->lba;
nkeynes@342
   430
    buf[4] = track->flags;
nkeynes@342
   431
    buf[5] = track_no;
nkeynes@342
   432
    buf[6] = 0x01; /* ?? */
nkeynes@342
   433
    buf[7] = (offset >> 16) & 0xFF;
nkeynes@342
   434
    buf[8] = (offset >> 8) & 0xFF;
nkeynes@342
   435
    buf[9] = offset & 0xFF;
nkeynes@342
   436
    buf[10] = 0;
nkeynes@342
   437
    buf[11] = (lba >> 16) & 0xFF;
nkeynes@342
   438
    buf[12] = (lba >> 8) & 0xFF;
nkeynes@342
   439
    buf[13] = lba & 0xFF;
nkeynes@422
   440
    return PKT_ERR_OK;
nkeynes@342
   441
}
nkeynes@342
   442
nkeynes@342
   443
static int gdrom_image_drive_status( gdrom_disc_t disc ) 
nkeynes@342
   444
{
nkeynes@342
   445
    gdrom_image_t image = (gdrom_image_t)disc;
nkeynes@720
   446
    if( image->disc_type == IDE_DISC_NONE ) {
nkeynes@720
   447
        return IDE_DISC_NONE;
nkeynes@720
   448
    } else {
nkeynes@720
   449
        return image->disc_type | IDE_DISC_READY;
nkeynes@720
   450
    }
nkeynes@342
   451
}
nkeynes@342
   452
nkeynes@342
   453
void gdrom_image_dump_info( gdrom_disc_t d ) {
nkeynes@342
   454
    gdrom_image_t disc = (gdrom_image_t)d;
nkeynes@342
   455
    int i;
nkeynes@342
   456
    int last_session = disc->track[disc->track_count-1].session;
nkeynes@342
   457
    gboolean is_bootable = FALSE;
nkeynes@342
   458
nkeynes@342
   459
    INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, 
nkeynes@736
   460
          disc->track[disc->track_count-1].session + 1 );
nkeynes@342
   461
    if( last_session > 0 ) {
nkeynes@736
   462
        /* Boot track is the first data track of the last session, provided that it 
nkeynes@736
   463
         * cannot be a single-session disc.
nkeynes@736
   464
         */
nkeynes@736
   465
        int boot_track = -1;
nkeynes@736
   466
        for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
nkeynes@736
   467
            if( disc->track[i].flags & TRACK_DATA ) {
nkeynes@736
   468
                boot_track = i;
nkeynes@736
   469
            }
nkeynes@736
   470
        }
nkeynes@736
   471
        if( boot_track != -1 ) {
nkeynes@736
   472
            unsigned char boot_sector[MAX_SECTOR_SIZE];
nkeynes@736
   473
            uint32_t length = sizeof(boot_sector);
nkeynes@736
   474
            if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
nkeynes@736
   475
                    boot_sector, &length ) == PKT_ERR_OK ) {
nkeynes@736
   476
                bootstrap_dump(boot_sector, FALSE);
nkeynes@736
   477
                is_bootable = TRUE;
nkeynes@736
   478
            }
nkeynes@736
   479
        }
nkeynes@342
   480
    }
nkeynes@342
   481
    if( !is_bootable ) {
nkeynes@736
   482
        WARN( "Disc does not appear to be bootable" );
nkeynes@342
   483
    }
nkeynes@342
   484
}
nkeynes@342
   485
nkeynes@709
   486
gdrom_device_t gdrom_device_new( const gchar *name, const gchar *dev_name )
nkeynes@709
   487
{
nkeynes@709
   488
    struct gdrom_device *dev = g_malloc0( sizeof(struct gdrom_device) );
nkeynes@709
   489
    dev->name = g_strdup(name);
nkeynes@709
   490
    dev->device_name = g_strdup(dev_name);
nkeynes@709
   491
    return dev;
nkeynes@709
   492
}
nkeynes@709
   493
nkeynes@709
   494
void gdrom_device_destroy( gdrom_device_t dev )
nkeynes@709
   495
{
nkeynes@709
   496
    if( dev->name != NULL ) {
nkeynes@709
   497
        g_free( dev->name );
nkeynes@709
   498
        dev->name = NULL;
nkeynes@709
   499
    }
nkeynes@709
   500
    if( dev->device_name != NULL ) {
nkeynes@709
   501
        g_free( dev->device_name );
nkeynes@709
   502
        dev->device_name = NULL;
nkeynes@709
   503
    }
nkeynes@709
   504
    g_free( dev );
nkeynes@709
   505
}
.