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lxdream.org :: lxdream/src/gdrom/gdimage.c
lxdream 0.9.1
released Jun 29
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filename src/gdrom/gdimage.c
changeset 464:8e099fad42a6
prev422:61a0598e07ff
next468:3a49695e081a
author nkeynes
date Sat Oct 27 05:44:54 2007 +0000 (14 years ago)
permissions -rw-r--r--
last change Initial gdrom attachment menu
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     1 /**
     2  * $Id: gdimage.c,v 1.3 2007-10-27 05:44:54 nkeynes Exp $
     3  *
     4  * GD-Rom image-file common functions. 
     5  *
     6  * Copyright (c) 2005 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    19 #include <netinet/in.h>
    21 #include "gdrom/gdrom.h"
    22 #include "gdrom/packet.h"
    23 #include "bootstrap.h"
    25 static void gdrom_image_destroy( gdrom_disc_t disc );
    26 static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode, 
    27 					      unsigned char *buf, uint32_t *readlength );
    28 static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf );
    29 static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf );
    30 static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf );
    31 static int gdrom_image_drive_status( gdrom_disc_t disc );
    34 /**
    35  * Initialize a gdrom_disc structure with the gdrom_image_* methods
    36  */
    37 void gdrom_image_init( gdrom_disc_t disc )
    38 {
    39     memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
    40     disc->read_sector = gdrom_image_read_sector;
    41     disc->read_toc = gdrom_image_read_toc;
    42     disc->read_session = gdrom_image_read_session;
    43     disc->read_position = gdrom_image_read_position;
    44     disc->drive_status = gdrom_image_drive_status;
    45     disc->play_audio = NULL; /* not supported yet */
    46     disc->run_time_slice = NULL; /* not needed */
    47     disc->close = gdrom_image_destroy;
    48 }
    50 gdrom_disc_t gdrom_image_new( const gchar *filename, FILE *f )
    51 {
    52     gdrom_image_t image = (gdrom_image_t)calloc(sizeof(struct gdrom_image), 1);
    53     if( image == NULL ) {
    54 	return NULL;
    55     }
    56     image->disc_type = IDE_DISC_CDROM;
    57     image->file = f;
    58     gdrom_disc_t disc = (gdrom_disc_t)image;
    59     gdrom_image_init(disc);
    60     if( filename == NULL ) {
    61 	disc->name = NULL;
    62     } else {
    63 	disc->name = g_strdup(filename);
    64     }
    66     return disc;
    67 }
    69 static void gdrom_image_destroy( gdrom_disc_t disc )
    70 {
    71     gdrom_image_t img = (gdrom_image_t)disc;
    72     if( img->file != NULL ) {
    73 	fclose(img->file);
    74 	img->file = NULL;
    75     }
    76     if( disc->name != NULL ) {
    77 	g_free( disc->name );
    78 	disc->name = NULL;
    79     }
    80     free( disc );
    81 }
    83 static int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
    84 {
    85     int i;
    86     for( i=0; i<image->track_count; i++ ) {
    87 	if( image->track[i].lba <= lba && 
    88 	    lba < (image->track[i].lba + image->track[i].sector_count) ) {
    89 	    return i+1;
    90 	}
    91     }
    92     return -1;
    93 }
    95 static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
    96 					      int mode, unsigned char *buf, uint32_t *length )
    97 {
    98     gdrom_image_t image = (gdrom_image_t)disc;
    99     int file_offset, read_len, track_no;
   101     track_no = gdrom_image_get_track_by_lba( image, lba );
   102     if( track_no == -1 ) {
   103 	return PKT_ERR_BADREAD;
   104     }
   105     struct gdrom_track *track = &image->track[track_no-1];
   106     file_offset = track->offset + track->sector_size * (lba - track->lba);
   107     read_len = track->sector_size;
   109     switch( mode ) {
   110     case 0x24:
   111     case 0x28:
   112 	switch( track->mode ) {
   113 	case GDROM_MODE1:
   114 	case GDROM_MODE2_XA1:
   115 	    fseek( image->file, file_offset, SEEK_SET );
   116 	    fread( buf, track->sector_size, 1, image->file );
   117 	    break;
   118 	case GDROM_MODE2:
   119 	    read_len = 2048;
   120 	    file_offset += 8; /* skip the subheader */
   121 	    fseek( image->file, file_offset, SEEK_SET );
   122 	    fread( buf, 2048, 1, image->file );
   123 	    break;
   124 	default:
   125 	    return PKT_ERR_BADREADMODE;
   126 	}
   127 	break;
   128     default:
   129 	return PKT_ERR_BADREADMODE;
   130     }
   132     *length = read_len;
   133     return PKT_ERR_OK;
   135 }
   137 static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf ) 
   138 {
   139     gdrom_image_t image = (gdrom_image_t)disc;
   140     struct gdrom_toc *toc = (struct gdrom_toc *)buf;
   141     int i;
   143     for( i=0; i<image->track_count; i++ ) {
   144 	toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
   145     }
   146     toc->first = 0x0100 | image->track[0].flags;
   147     toc->last = (image->track_count<<8) | image->track[i-1].flags;
   148     toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
   149 	image->track[i-1].flags;
   150     for( ;i<99; i++ )
   151 	toc->track[i] = 0xFFFFFFFF;
   152     return PKT_ERR_OK;
   153 }
   155 static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf )
   156 {
   157     gdrom_image_t image = (gdrom_image_t)disc;
   158     struct gdrom_track *last_track = &image->track[image->track_count-1];
   159     unsigned int end_of_disc = last_track->lba + last_track->sector_count;
   160     int i;
   161     buf[0] = 0x01; /* Disc status? */
   162     buf[1] = 0;
   164     if( session == 0 ) {
   165 	buf[2] = last_track->session+1; /* last session */
   166 	buf[3] = (end_of_disc >> 16) & 0xFF;
   167 	buf[4] = (end_of_disc >> 8) & 0xFF;
   168 	buf[5] = end_of_disc & 0xFF;
   169 	return PKT_ERR_OK;
   170     } else {
   171 	session--;
   172 	for( i=0; i<image->track_count; i++ ) {
   173 	    if( image->track[i].session == session ) {
   174 		buf[2] = i+1; /* first track of session */
   175 		buf[3] = (image->track[i].lba >> 16) & 0xFF;
   176 		buf[4] = (image->track[i].lba >> 8) & 0xFF;
   177 		buf[5] = image->track[i].lba & 0xFF;
   178 		return PKT_ERR_OK;
   179 	    }
   180 	}
   181 	return PKT_ERR_BADFIELD; /* No such session */
   182     }
   183 }
   185 static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf )
   186 {
   187     gdrom_image_t image = (gdrom_image_t)disc;
   188     int track_no = gdrom_image_get_track_by_lba( image, lba );
   189     if( track_no == -1 ) {
   190 	track_no = 1;
   191 	lba = 150;
   192     }
   193     struct gdrom_track *track = &image->track[track_no-1];
   194     uint32_t offset = lba - track->lba;
   195     buf[4] = track->flags;
   196     buf[5] = track_no;
   197     buf[6] = 0x01; /* ?? */
   198     buf[7] = (offset >> 16) & 0xFF;
   199     buf[8] = (offset >> 8) & 0xFF;
   200     buf[9] = offset & 0xFF;
   201     buf[10] = 0;
   202     buf[11] = (lba >> 16) & 0xFF;
   203     buf[12] = (lba >> 8) & 0xFF;
   204     buf[13] = lba & 0xFF;
   205     return PKT_ERR_OK;
   206 }
   208 static int gdrom_image_drive_status( gdrom_disc_t disc ) 
   209 {
   210     gdrom_image_t image = (gdrom_image_t)disc;
   211     return image->disc_type | IDE_DISC_READY;
   212 }
   214 void gdrom_image_dump_info( gdrom_disc_t d ) {
   215     gdrom_image_t disc = (gdrom_image_t)d;
   216     int i;
   217     int last_session = disc->track[disc->track_count-1].session;
   218     gboolean is_bootable = FALSE;
   220     INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, 
   221 	  disc->track[disc->track_count-1].session + 1 );
   222     if( last_session > 0 ) {
   223 	/* Boot track is the first data track of the last session, provided that it 
   224 	 * cannot be a single-session disc.
   225 	 */
   226 	int boot_track = -1;
   227 	for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
   228 	    if( disc->track[i].flags & TRACK_DATA ) {
   229 		boot_track = i;
   230 	    }
   231 	}
   232 	if( boot_track != -1 ) {
   233 	    unsigned char boot_sector[MAX_SECTOR_SIZE];
   234 	    uint32_t length = sizeof(boot_sector);
   235 	    if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
   236 				   boot_sector, &length ) == PKT_ERR_OK ) {
   237 		bootstrap_dump(boot_sector, FALSE);
   238 		is_bootable = TRUE;
   239 	    }
   240 	}
   241     }
   242     if( !is_bootable ) {
   243 	WARN( "Disc does not appear to be bootable" );
   244     }
   245 }
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