k3b/libk3bdevice/k3bdevice_mmc.cpp

/*
 *
 * $Id: k3bdevice_mmc.cpp 690628 2007-07-21 16:05:08Z trueg $
 * Copyright (C) 2003-2007 Sebastian Trueg <trueg@k3b.org>
 *
 * This file is part of the K3b project.
 * Copyright (C) 1998-2007 Sebastian Trueg <trueg@k3b.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * See the file "COPYING" for the exact licensing terms.
 */

/**
This file contains all the MMC command implementations of the K3b device class
to make the code more readable.
**/


#include "k3bdevice.h"
#include "k3bscsicommand.h"
#include "k3bdeviceglobals.h"
#include "k3bdebug.h"

#include <string.h>


bool K3bDevice::Device::testUnitReady() const
{
  ScsiCommand cmd( this );
  cmd.enableErrorMessages( false );
  cmd[0] = MMC_TEST_UNIT_READY;
  cmd[5] = 0; // Necessary to set the proper command length
  return( cmd.transport() == 0 );
}


bool K3bDevice::Device::getFeature( unsigned char** data, unsigned int& dataLen, unsigned int feature ) const
{
  unsigned char header[2048];
  ::memset( header, 0, 2048 );

  ScsiCommand cmd( this );
  cmd[0] = MMC_GET_CONFIGURATION;
  cmd[1] = 2;      // read only specified feature
  cmd[2] = feature>>8;
  cmd[3] = feature;
  cmd[8] = 8;      // we only read the data length first
  cmd[9] = 0;      // Necessary to set the proper command length

  // we only read the data length first
  dataLen = 8;
  if( cmd.transport( TR_DIR_READ, header, 8 ) )
    dataLen = from4Byte( header ) + 4;
  else
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": GET CONFIGURATION length det failed." << endl;

  //
  // Some buggy firmwares do not return the size of the available data
  // but the returned data or something invalid altogether.
  // So we simply use the maximum possible value to be on the safe side
  // with these buggy drives.
  // We cannot use this as default since many firmwares fail with a too high data length.
  //
  if( (dataLen-8) % 8 || dataLen <= 8 )
    dataLen = 0xFFFF;

  // again with real length
  *data = new unsigned char[dataLen];
  ::memset( *data, 0, dataLen );

  cmd[7] = dataLen>>8;
  cmd[8] = dataLen;
  if( cmd.transport( TR_DIR_READ, *data, dataLen ) == 0 ) {
    dataLen = TQMIN( dataLen, from4Byte( *data ) + 4 );
    return true;
  }
  else {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": GET CONFIGURATION with real length "
	      << dataLen << " failed." << endl;
    delete [] *data;
  }

  return false;
}


int K3bDevice::Device::featureCurrent( unsigned int feature ) const
{
  unsigned char* data = 0;
  unsigned int dataLen = 0;
  if( getFeature( &data, dataLen, feature ) ) {
    int ret = -1;
    if( dataLen >= 11 )
      ret = ( data[8+2]&1 ? 1 : 0 );  // check the current flag

    delete [] data;

    return ret;
  }
  else
    return -1;
}


bool K3bDevice::Device::readIsrc( unsigned int track, TQCString& isrc ) const
{
  unsigned char* data = 0;
  unsigned int dataLen = 0;

  if( readSubChannel( &data, dataLen, 0x3, track ) ) {
    bool isrcValid = false;

    if( dataLen >= 8+18 ) {
      isrcValid = (data[8+4]>>7 & 0x1);

      if( isrcValid ) {
	isrc = TQCString( reinterpret_cast<char*>(data[8+5]), 13 );

	// TODO: check the range of the chars

      }
    }

    delete [] data;

    return isrcValid;
  }
  else
    return false;
}


bool K3bDevice::Device::readMcn( TQCString& mcn ) const
{
  unsigned char* data = 0;
  unsigned int dataLen = 0;

  if( readSubChannel( &data, dataLen, 0x2, 0 ) ) {
    bool mcnValid = false;

    if( dataLen >= 8+18 ) {
      mcnValid = (data[8+4]>>7 & 0x1);

      if( mcnValid )
	mcn = TQCString( reinterpret_cast<char*>(data[8+5]), 14 );
    }

    delete [] data;

    return mcnValid;
  }
  else
    return false;
}


bool K3bDevice::Device::getPerformance( unsigned char** data, unsigned int& dataLen,
					unsigned int type,
					unsigned int dataType,
					unsigned int lba ) const
{
  unsigned int descLen = 0;
  switch( type ) {
  case 0x0:
    descLen = 16;
    break;
  case 0x1:
    descLen = 8;
    break;
  case 0x2:
    descLen = 2048;
    break;
  case 0x3:
    descLen = 16;
    break;
  case 0x4:
    descLen = 8;
    break;
  case 0x5:
    descLen = 8; // FIXME: ??
    break;
  }

  unsigned char header[8];
  ::memset( header, 0, 8 );
  dataLen = 8;

  ScsiCommand cmd( this );
  cmd[0] = MMC_GET_PERFORMANCE;
  cmd[1] = dataType;
  cmd[2] = lba >> 24;
  cmd[3] = lba >> 16;
  cmd[4] = lba >> 8;
  cmd[5] = lba;
  cmd[9] = 1;      // first we read one descriptor
  cmd[10] = type;
  cmd[11] = 0;     // Necessary to set the proper command length
  if( cmd.transport( TR_DIR_READ, header, 8 ) ) {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName()
	      << ": GET PERFORMANCE length det failed." << endl;
    return false;
  }

  dataLen = from4Byte( header ) + 4;

  k3bDebug() << "(K3bDevice::Device) " << blockDeviceName()
             << ": GET PERFORMANCE dataLen = " << dataLen << endl;

  if( (dataLen-8) % descLen ||
      dataLen <= 8 ||
      dataLen > 2048 ) {
      k3bDebug() << "(K3bDevice::Device) " << blockDeviceName()
                 << ": GET PERFORMANCE reports bogus dataLen: " << dataLen << endl;
      return false;
  }

  *data = new unsigned char[dataLen];
  ::memset( *data, 0, dataLen );

  unsigned int numDesc = (dataLen-8)/descLen;

  cmd[8] = numDesc>>8;
  cmd[9] = numDesc;
  if( cmd.transport( TR_DIR_READ, *data, dataLen ) == 0 ) {
      k3bDebug() << "(K3bDevice::Device) " << blockDeviceName()
                 << ": GET PERFORMANCE successful with reported length: " << from4Byte( *data ) << endl;
      dataLen = TQMIN( dataLen, from4Byte( *data ) + 4 );
      return true;
  }
  else {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName()
	      << ": GET PERFORMANCE with real length "
	      << dataLen << " failed." << endl;
    delete [] *data;
    return false;
  }
}


bool K3bDevice::Device::setSpeed( unsigned int readingSpeed,
				  unsigned int writingSpeed,
				  bool cav ) const
{
  ScsiCommand cmd( this );
  cmd[0] = MMC_SET_SPEED;
  cmd[1] = ( cav ? 0x1 : 0x0 );
  cmd[2] = readingSpeed >> 8;
  cmd[3] = readingSpeed;
  cmd[4] = writingSpeed >> 8;
  cmd[5] = writingSpeed;
  cmd[11] = 0;      // Necessary to set the proper command length
  return ( cmd.transport( TR_DIR_WRITE ) == 0 );
}


bool K3bDevice::Device::seek( unsigned long lba ) const
{
  ScsiCommand cmd( this );
  cmd[0] = MMC_SEEK_10;
  cmd[2] = lba>>24;
  cmd[3] = lba>>16;
  cmd[4] = lba>>8;
  cmd[5] = lba;
  cmd[9] = 0;      // Necessary to set the proper command length
  return !cmd.transport();
}


bool K3bDevice::Device::readTrackInformation( unsigned char** data, unsigned int& dataLen, int type, int value ) const
{
  unsigned char header[2048];
  ::memset( header, 0, 2048 );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_TRACK_INFORMATION;
  cmd[9] = 0;      // Necessary to set the proper command length

  switch( type ) {
  case 0:
  case 1:
  case 2:
    cmd[1] = type & 0x3;
    cmd[2] = value>>24;
    cmd[3] = value>>16;
    cmd[4] = value>>8;
    cmd[5] = value;
    break;
  default:
    k3bDebug() << "(K3bDevice::readTrackInformation) wrong type parameter: " << type << endl;
    return false;
  }

  // first we read the header
  dataLen = 4;
  cmd[8] = 4;
  if( cmd.transport( TR_DIR_READ, header, 4 ) == 0 )
    dataLen = from2Byte( header ) + 2;
  else
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ TRACK INFORMATION length det failed." << endl;

  //
  // Some buggy firmwares do not return the size of the available data
  // but the returned data.
  // So we try to determine the correct size based on the medium type
  // DVD+R:  40 (MMC4)
  // DVD-DL: 48 (MMC5)
  // CD:     36 (MMC2)
  //
  if( dataLen <= 4 ) {
    int m = mediaType();
    if( m & (MEDIA_DVD_R_DL|MEDIA_DVD_R_DL_SEQ|MEDIA_DVD_R_DL_JUMP) )
      dataLen = 48;
    else if( m & (MEDIA_DVD_PLUS_R|MEDIA_DVD_PLUS_R_DL) )
      dataLen = 40;
    else
      dataLen = 36;
  }

  // again with real length
  *data = new unsigned char[dataLen];
  ::memset( *data, 0, dataLen );

  cmd[7] = dataLen>>8;
  cmd[8] = dataLen;
  if( cmd.transport( TR_DIR_READ, *data, dataLen ) == 0 ) {
    dataLen = TQMIN( dataLen, from2Byte( *data ) + 2u );
    return true;
  }
  else {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ TRACK INFORMATION with real length "
	      << dataLen << " failed." << endl;
    delete [] *data;
  }

  return false;
}



bool K3bDevice::Device::read10( unsigned char* data,
				unsigned int dataLen,
				unsigned long startAdress,
				unsigned int length,
				bool fua ) const
{
  ::memset( data, 0, dataLen );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_10;
  cmd[1] = ( fua ? 0x8 : 0x0 );
  cmd[2] = startAdress>>24;
  cmd[3] = startAdress>>16;
  cmd[4] = startAdress>>8;
  cmd[5] = startAdress;
  cmd[7] = length>>8;
  cmd[8] = length;
  cmd[9] = 0;      // Necessary to set the proper command length

  if( cmd.transport( TR_DIR_READ, data, dataLen ) ) {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ 10 failed!" << endl;
    return false;
  }
  else
    return true;
}


bool K3bDevice::Device::read12( unsigned char* data,
				unsigned int dataLen,
				unsigned long startAdress,
				unsigned long length,
				bool streaming,
				bool fua ) const
{
  ::memset( data, 0, dataLen );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_12;
  cmd[1] = ( fua ? 0x8 : 0x0 );
  cmd[2] = startAdress>>24;
  cmd[3] = startAdress>>16;
  cmd[4] = startAdress>>8;
  cmd[5] = startAdress;
  cmd[6] = length>>24;
  cmd[7] = length>>16;
  cmd[8] = length>>8;
  cmd[9] = length;
  cmd[10] = (streaming ? 0x80 : 0 );
  cmd[11] = 0;      // Necessary to set the proper command length

  if( cmd.transport( TR_DIR_READ, data, dataLen ) ) {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ 12 failed!" << endl;
    return false;
  }
  else
    return true;
}


bool K3bDevice::Device::readCd( unsigned char* data,
				unsigned int dataLen,
				int sectorType,
				bool dap,
				unsigned long startAdress,
				unsigned long length,
				bool sync,
				bool header,
				bool subHeader,
				bool userData,
				bool edcEcc,
				int c2,
				int subChannel ) const
{
  ::memset( data, 0, dataLen );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_CD;
  cmd[1] = (sectorType<<2 & 0x1c) | ( dap ? 0x2 : 0x0 );
  cmd[2] = startAdress>>24;
  cmd[3] = startAdress>>16;
  cmd[4] = startAdress>>8;
  cmd[5] = startAdress;
  cmd[6] = length>>16;
  cmd[7] = length>>8;
  cmd[8] = length;
  cmd[9] = ( ( sync      ? 0x80 : 0x0 ) |
	     ( subHeader ? 0x40 : 0x0 ) |
	     ( header    ? 0x20 : 0x0 ) |
	     ( userData  ? 0x10 : 0x0 ) |
	     ( edcEcc    ? 0x8  : 0x0 ) |
	     ( c2<<1 & 0x6 ) );
  cmd[10] = subChannel & 0x7;
  cmd[11] = 0;      // Necessary to set the proper command length

  if( cmd.transport( TR_DIR_READ, data, dataLen ) ) {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ CD failed!" << endl;
    return false;
  }
  else {
    return true;
  }
}


bool K3bDevice::Device::readCdMsf( unsigned char* data,
				   unsigned int dataLen,
				   int sectorType,
				   bool dap,
				   const K3b::Msf& startAdress,
				   const K3b::Msf& endAdress,
				   bool sync,
				   bool header,
				   bool subHeader,
				   bool userData,
				   bool edcEcc,
				   int c2,
				   int subChannel ) const
{
  ::memset( data, 0, dataLen );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_CD_MSF;
  cmd[1] = (sectorType<<2 & 0x1c) | ( dap ? 0x2 : 0x0 );
  cmd[3] = (startAdress+150).minutes();
  cmd[4] = (startAdress+150).seconds();
  cmd[5] = (startAdress+150).frames();
  cmd[6] = (endAdress+150).minutes();
  cmd[7] = (endAdress+150).seconds();
  cmd[8] = (endAdress+150).frames();
  cmd[9] = ( ( sync      ? 0x80 : 0x0 ) |
	     ( subHeader ? 0x40 : 0x0 ) |
	     ( header    ? 0x20 : 0x0 ) |
	     ( userData  ? 0x10 : 0x0 ) |
	     ( edcEcc    ? 0x8  : 0x0 ) |
	     ( c2<<1 & 0x6 ) );
  cmd[10] = subChannel & 0x7;
  cmd[11] = 0;      // Necessary to set the proper command length

  if( cmd.transport( TR_DIR_READ, data, dataLen ) ) {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ CD MSF failed!" << endl;
    return false;
  }
  else
    return true;
}


bool K3bDevice::Device::readSubChannel( unsigned char** data, unsigned int& dataLen,
					unsigned int subchannelParam,
					unsigned int trackNumber ) const
{
  unsigned char header[2048];
  ::memset( header, 0, 2048 );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_SUB_CHANNEL;
  cmd[2] = 0x40;    // SUBQ
  cmd[3] = subchannelParam;
  cmd[6] = trackNumber;   // only used when subchannelParam == 03h (ISRC)
  cmd[8] = 4;
  cmd[9] = 0;      // Necessary to set the proper command length

  // first we read the header
  dataLen = 4;
  if( cmd.transport( TR_DIR_READ, header, 4 ) == 0 )
    dataLen = from2Byte( &header[2] ) + 4;
  else
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ SUB-CHANNEL length det failed." << endl;

  //
  // Some buggy firmwares do not return the size of the available data
  // but the returned data. So we simply use the maximum possible value to be on the safe side
  // with these buggy drives.
  // We cannot use this as default since many firmwares fail with a too high data length.
  //
  if( dataLen <= 4 )
    dataLen = 0xFFFF;

  // again with real length
  *data = new unsigned char[dataLen];
  ::memset( *data, 0, dataLen );

  cmd[7] = dataLen>>8;
  cmd[8] = dataLen;
  if( cmd.transport( TR_DIR_READ, *data, dataLen ) == 0 ) {
    dataLen = TQMIN( dataLen, from2Byte( (*data)+2 ) + 4u );
    return true;
  }
  else {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ SUB-CHANNEL with real length "
	      << dataLen << " failed." << endl;
    delete [] *data;
  }

  return false;
}


bool K3bDevice::Device::readTocPmaAtip( unsigned char** data, unsigned int& dataLen, int format, bool time, int track ) const
{
  unsigned int descLen = 0;

  switch( format ) {
  case 0x0:
    descLen = 8;
    break;
  case 0x1:
    descLen = 8;
    break;
  case 0x2:
    descLen = 11;
    break;
  case 0x3:
    descLen = 11;
    break;
  case 0x4:
    descLen = 4; // MMC2: 24 and MMC4: 28, so we use the highest common factor
    break;
  case 0x5:
    descLen = 18;
    break;
  }

  unsigned char header[2048];
  ::memset( header, 0, 2048 );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_TOC_PMA_ATIP;
  cmd[1] = ( time ? 0x2 : 0x0 );
  cmd[2] = format & 0x0F;
  cmd[6] = track;
  cmd[8] = 4;
  cmd[9] = 0;      // Necessary to set the proper command length

  // we only read the header
  dataLen = 4;
  if( cmd.transport( TR_DIR_READ, header, 4 ) == 0 )
    dataLen = from2Byte( header ) + 2;
  else
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ TOC/PMA/ATIP length det failed." << endl;

  //
  // Some buggy firmwares return an invalid size here
  // So we simply use the maximum possible value to be on the safe side
  // with these buggy drives.
  // We cannot use this as default since many firmwares fail with a too high data length.
  //
  if( (dataLen-4) % descLen || dataLen < 4+descLen ) {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ TOC/PMA/ATIP invalid length returned: " << dataLen << endl;
    dataLen = 0xFFFF;
  }

  //
  // Not all drives like uneven numbers
  //
  if( dataLen%2 )
    ++dataLen;

  // again with real length
  *data = new unsigned char[dataLen];
  ::memset( *data, 0, dataLen );

  cmd[7] = dataLen>>8;
  cmd[8] = dataLen;
  if( cmd.transport( TR_DIR_READ, *data, dataLen ) == 0 ) {
    dataLen = TQMIN( dataLen, from2Byte( *data ) + 2u );
    if( (dataLen-4) % descLen || dataLen < 4+descLen ) {
        // useless length
        delete [] *data;
        return false;
    }
    else
        return true;
  }
  else {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ TOC/PMA/ATIP format "
	      << format << " with real length "
	      << dataLen << " failed." << endl;
    delete [] *data;
  }

  return false;
}


bool K3bDevice::Device::mechanismtqStatus( unsigned char** data, unsigned int& dataLen ) const
{
  unsigned char header[2048];
  ::memset( header, 0, 2048 );

  ScsiCommand cmd( this );
  cmd[0] = MMC_MECHANISM_STATUS;
  cmd[9] = 8;
  cmd[11] = 0;    // Necessary to set the proper command length

  // first we read the header
  dataLen = 8;
  if( cmd.transport( TR_DIR_READ, header, 8 ) == 0 )
    dataLen = from4Byte( &header[6] ) + 8;
  else
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": MECHANISM STATUS length det failed." << endl;

  //
  // Some buggy firmwares do not return the size of the available data
  // but the returned data or something invalid altogether.
  // So we simply use the maximum possible value to be on the safe side
  // with these buggy drives.
  // We cannot use this as default since many firmwares fail with a too high data length.
  //
  if( (dataLen-8) % 4 || dataLen <= 8 )
    dataLen = 0xFFFF;

  k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": MECHANISM STATUS "
	    << (int)header[5] << " slots." << endl;

  // again with real length
  *data = new unsigned char[dataLen];
  ::memset( *data, 0, dataLen );

  cmd[8] = dataLen>>8;
  cmd[9] = dataLen;
  if( cmd.transport( TR_DIR_READ, *data, dataLen ) == 0 ) {
    dataLen = TQMIN( dataLen, from4Byte( (*data)+6 ) + 8 );
    return true;
  }
  else {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": MECHANISM STATUS with real length "
	      << dataLen << " failed." << endl;
    delete [] *data;
  }

  return false;
}



bool K3bDevice::Device::modeSense( unsigned char** pageData, unsigned int& pageLen, int page ) const
{
  unsigned char header[2048];
  ::memset( header, 0, 2048 );

  ScsiCommand cmd( this );
  cmd[0] = MMC_MODE_SENSE;
  cmd[1] = 0x8;        // Disable Block Descriptors
  cmd[2] = page & 0x3F;
  cmd[8] = 8;
  cmd[9] = 0;           // Necessary to set the proper command length

  // first we determine the data length
  pageLen = 8;
  if( cmd.transport( TR_DIR_READ, header, 8 ) == 0 )
    pageLen = from2Byte( header ) + 2;
  else
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": MODE SENSE length det failed." << endl;

  //
  // Some buggy firmwares do not return the size of the available data
  // but the returned data. So we simply use the maximum possible value to be on the safe side
  // with these buggy drives.
  // We cannot use this as default since many firmwares fail with a too high data length.
  //
  if( pageLen == 8 )
    pageLen = 0xFFFF;

  // again with real length
  *pageData = new unsigned char[pageLen];
  ::memset( *pageData, 0, pageLen );

  cmd[7] = pageLen>>8;
  cmd[8] = pageLen;
  if( cmd.transport( TR_DIR_READ, *pageData, pageLen ) == 0 ) {
    pageLen = TQMIN( pageLen, from2Byte( *pageData ) + 2u );
    return true;
  }
  else {
    delete [] *pageData;
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": MODE SENSE with real length "
	      << pageLen << " failed." << endl;
  }

  return false;
}


bool K3bDevice::Device::modeSelect( unsigned char* page, unsigned int pageLen, bool pf, bool sp ) const
{
  page[0] = 0;
  page[1] = 0;
  page[4] = 0;
  page[5] = 0;

  // we do not support Block Descriptors here
  page[6] = 0;
  page[7] = 0;

  // PS bit reserved
  page[8] &= 0x3F;

  ScsiCommand cmd( this );
  cmd[0] = MMC_MODE_SELECT;
  cmd[1] = ( sp ? 1 : 0 ) | ( pf ? 0x10 : 0 );
  cmd[7] = pageLen>>8;
  cmd[8] = pageLen;
  cmd[9] = 0;
  return( cmd.transport( TR_DIR_WRITE, page, pageLen ) == 0 );
}


// does only make sense for complete media
bool K3bDevice::Device::readCapacity( K3b::Msf& r ) const
{
  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_CAPACITY;
  cmd[9] = 0;      // Necessary to set the proper command length
  unsigned char buf[8];
  ::memset( buf, 0, 8 );
  if( cmd.transport( TR_DIR_READ, buf, 8 ) == 0 ) {
    r = from4Byte( buf );
    return true;
  }
  else
    return false;
}


bool K3bDevice::Device::readFormatCapacity( int wantedFormat, K3b::Msf& r,
					    K3b::Msf* currentMax, int* currentMaxFormat ) const
{
  bool success = false;

  // the maximal length as stated in MMC4
  static const unsigned int maxLen = 4 + (8*32);

  unsigned char buffer[maxLen];
  ::memset( buffer, 0, maxLen );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_FORMAT_CAPACITIES;
  cmd[7] = maxLen >> 8;
  cmd[8] = maxLen & 0xFF;
  cmd[9] = 0;      // Necessary to set the proper command length
  if( cmd.transport( TR_DIR_READ, buffer, maxLen ) == 0 ) {

    unsigned int realLength = buffer[3] + 4;

    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << " READ FORMAT CAPACITY: Current/Max "
	      << (int)(buffer[8]&0x3) << " " << from4Byte( &buffer[4] ) << endl;

    if( currentMax )
      *currentMax = from4Byte( &buffer[4] );
    if( currentMaxFormat )
      *currentMaxFormat = (int)(buffer[8]&0x3);

    //
    // Descriptor Type:
    // 0 - reserved
    // 1 - unformatted :)
    // 2 - formatted. Here we get the used capacity (lead-in to last lead-out/border-out)
    // 3 - No media present
    //
    for( unsigned int i = 12; i < realLength-4; i+=8 ) {
      int format = (int)((buffer[i+4]>>2)&0x3f);
      k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << " READ FORMAT CAPACITY: "
		<< format << " " << from4Byte( &buffer[i] )
		<< " " << (int)( buffer[i+5] << 16 & 0xFF0000 |
				 buffer[i+6] << 8  & 0xFF00 |
				 buffer[i+7]       & 0xFF ) << endl;

      if( format == wantedFormat ) {
	// found the descriptor
	r = TQMAX( (int)from4Byte( &buffer[i] ), r.lba() );
	success = true;
      }
    }
  }

  return success;
}


bool K3bDevice::Device::readDiscInformation( unsigned char** data, unsigned int& dataLen ) const
{
  unsigned char header[2];
  ::memset( header, 0, 2 );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_DISC_INFORMATION;
  cmd[8] = 2;
  cmd[9] = 0;      // Necessary to set the proper command length

  if( cmd.transport( TR_DIR_READ, header, 2 ) == 0 )
    dataLen = from2Byte( header ) + 2;
  else
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName()
	       << ": READ DISC INFORMATION length det failed" << endl;

  if( dataLen < 32 ) {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName()
	       << ": Device reports bogus disc information length of " << dataLen << endl;
    dataLen = 32;
  }

  *data = new unsigned char[dataLen];
  ::memset( *data, 0, dataLen );

  cmd[7] = dataLen>>8;
  cmd[8] = dataLen;
  if( cmd.transport( TR_DIR_READ, *data, dataLen ) == 0 ) {
    dataLen = TQMIN( dataLen, from2Byte( *data ) + 2u );
    return true;
  }
  else {
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ DISC INFORMATION with real length "
	      << dataLen << " failed." << endl;
    delete [] *data;
  }

  return false;
}


bool K3bDevice::Device::readDvdStructure( unsigned char** data, unsigned int& dataLen,
					  unsigned int format,
					  unsigned int layer,
					  unsigned long adress,
					  unsigned int agid ) const
{
  return readDiscStructure( data, dataLen, 0x0, format, layer, adress, agid );
}


bool K3bDevice::Device::readDiscStructure( unsigned char** data, unsigned int& dataLen,
					   unsigned int mediaType,
					   unsigned int format,
					   unsigned int layer,
					   unsigned long adress,
					   unsigned int agid ) const
{
  unsigned char header[4];
  ::memset( header, 0, 4 );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_DVD_STRUCTURE;
  cmd[1] = mediaType & 0xF;
  cmd[2] = adress>>24;
  cmd[3] = adress>>16;
  cmd[4] = adress>>8;
  cmd[5] = adress;
  cmd[6] = layer;
  cmd[7] = format;
  cmd[10] = (agid<<6);
  cmd[11] = 0;      // Necessary to set the proper command length

  cmd[9] = 4;
  if( cmd.transport( TR_DIR_READ, header, 4 ) == 0 ) {
    // again with real length
    dataLen = from2Byte( header ) + 2;

    *data = new unsigned char[dataLen];
    ::memset( *data, 0, dataLen );

    cmd[8] = dataLen>>8;
    cmd[9] = dataLen;
    if( cmd.transport( TR_DIR_READ, *data, dataLen ) == 0 ) {
      dataLen = TQMIN( dataLen, from2Byte( *data ) + 2u );
      return true;
    }
    else {
      k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ DVD STRUCTURE with real length failed." << endl;
      delete [] *data;
    }
  }
  else
    k3bDebug() << "(K3bDevice::Device) " << blockDeviceName() << ": READ DVD STRUCTURE length det failed" << endl;

  return false;
}


int K3bDevice::Device::readBufferCapacity( long long& bufferLength, long long& bufferAvail ) const
{
  unsigned char data[12];
  ::memset( data, 0, 12 );

  ScsiCommand cmd( this );
  cmd[0] = MMC_READ_BUFFER_CAPACITY;
  cmd[8] = 12;
  cmd[9] = 0;      // Necessary to set the proper command length
  int r = cmd.transport( TR_DIR_READ, data, 12 );
  if( r )
    return r;

  unsigned int dataLength = from2Byte( data );

  if( dataLength >= 10 ) {
    bufferLength = from4Byte( &data[4] );
    bufferAvail = from4Byte( &data[8] );
  }
  else {
    bufferAvail = bufferLength = 0;
  }

  return 0;
}