libbrasero-media/scsi-read10.c

   1 /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
   2 /*
   3  * Libbrasero-media
   4  * Copyright (C) Philippe Rouquier 2005-2009 <bonfire-app@wanadoo.fr>
   5  *
   6  * Libbrasero-media is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * The Libbrasero-media authors hereby grant permission for non-GPL compatible
  12  * GStreamer plugins to be used and distributed together with GStreamer
  13  * and Libbrasero-media. This permission is above and beyond the permissions granted
  14  * by the GPL license by which Libbrasero-media is covered. If you modify this code
  15  * you may extend this exception to your version of the code, but you are not
  16  * obligated to do so. If you do not wish to do so, delete this exception
  17  * statement from your version.
  18  *
  19  * Libbrasero-media is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to:
  26  *      The Free Software Foundation, Inc.,
  27  *      51 Franklin Street, Fifth Floor
  28  *      Boston, MA  02110-1301, USA.
  29  */
  30
  31 #ifdef HAVE_CONFIG_H
  32 #  include <config.h>
  33 #endif
  34
  35 #include <glib.h>
  36
  37 #include "scsi-sbc.h"
  38
  39 #include "scsi-error.h"
  40 #include "scsi-utils.h"
  41 #include "scsi-base.h"
  42 #include "scsi-command.h"
  43 #include "scsi-opcodes.h"
  44
  45 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
  46
  47 struct _BraseroRead10CDB {
  48         uchar opcode;
  49
  50         uchar reladr            :1;
  51         uchar reserved1         :2;
  52         uchar FUA               :1;
  53         uchar DPO               :1;
  54         uchar reserved2         :3;
  55
  56         uchar start_address     [4];
  57
  58         uchar reserved3;
  59
  60         uchar len               [2];
  61
  62         uchar ctl;
  63 };
  64
  65 #else
  66
  67 struct _BraseroRead10CDB {
  68         uchar opcode;
  69
  70         uchar reserved2         :3;
  71         uchar DPO               :1;
  72         uchar FUA               :1;
  73         uchar reserved1         :2;
  74         uchar reladr            :1;
  75
  76         uchar start_address     [4];
  77
  78         uchar reserved3;
  79
  80         uchar len               [2];
  81
  82         uchar ctl;
  83 };
  84
  85 #endif
  86
  87 typedef struct _BraseroRead10CDB BraseroRead10CDB;
  88
  89 BRASERO_SCSI_COMMAND_DEFINE (BraseroRead10CDB,
  90                              READ10,
  91                              BRASERO_SCSI_READ);
  92
  93 BraseroScsiResult
  94 brasero_sbc_read10_block (BraseroDeviceHandle *handle,
  95                           int start,
  96                           int num_blocks,
  97                           unsigned char *buffer,
  98                           int buffer_size,
  99                           BraseroScsiErrCode *error)
 100 {
 101         BraseroRead10CDB *cdb;
 102         BraseroScsiResult res;
 103
 104         g_return_val_if_fail (handle != NULL, BRASERO_SCSI_FAILURE);
 105
 106         cdb = brasero_scsi_command_new (&info, handle);
 107         BRASERO_SET_32 (cdb->start_address, start);
 108
 109         /* NOTE: if we just want to test if block is readable len can be 0 */
 110         BRASERO_SET_16 (cdb->len, num_blocks);
 111
 112         /* reladr should be 0 */
 113         /* DPO should be 0 */
 114
 115         /* This is to force reading media ==> no caching (set to 1) */
 116         /* On the other hand caching improves dramatically the performances. */
 117         cdb->FUA = 0;
 118
 119         memset (buffer, 0, buffer_size);
 120         res = brasero_scsi_command_issue_sync (cdb,
 121                                                buffer,
 122                                                buffer_size,
 123                                                error);
 124         brasero_scsi_command_free (cdb);
 125         return res;
 126 }