// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : SSC.cs
// Version        : 1.0
// Author(s)      : Natalia Portillo
//
// Component      : SCSI Stream Commands
//
// Revision       : $Revision$
// Last change by : $Author$
// Date           : $Date$
//
// --[ Description ] ----------------------------------------------------------
//
// Description
//
// --[ License ] --------------------------------------------------------------
//
//     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 3 of the
//     License, or (at your option) any later version.
//
//     This program is distributed in the hope that it will be useful,
//     but WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//     GNU General Public License for more details.
//
//     You should have received a copy of the GNU General Public License
//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright (C) 2011-2015 Claunia.com
// ****************************************************************************/
// //$Id$
using System;
using DiscImageChef.Console;

namespace DiscImageChef.Devices
{
    public partial class Device
    {
        /// <summary>
        /// Prepares the medium for reading
        /// </summary>
        /// <returns><c>true</c>, if load was successful, <c>false</c> otherwise.</returns>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Load(out byte[] senseBuffer, uint timeout, out double duration)
        {
            return LoadUnload(out senseBuffer, false, true, false, false, false, timeout, out duration);
        }

        /// <summary>
        /// Prepares the medium for ejection
        /// </summary>
        /// <returns><c>true</c>, if unload was successful, <c>false</c> otherwise.</returns>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Unload(out byte[] senseBuffer, uint timeout, out double duration)
        {
            return LoadUnload(out senseBuffer, false, false, false, false, false, timeout, out duration);
        }

        /// <summary>
        /// Prepares the medium for reading or ejection
        /// </summary>
        /// <returns><c>true</c>, if load/unload was successful, <c>false</c> otherwise.</returns>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="immediate">If set to <c>true</c>, return from the command immediately.</param>
        /// <param name="load">If set to <c>true</c> load the medium for reading.</param>
        /// <param name="retense">If set to <c>true</c> retense the tape.</param>
        /// <param name="endOfTape">If set to <c>true</c> move the medium to the EOT mark.</param>
        /// <param name="hold">If set to <c>true</c> and <paramref name="load"/> is also set to <c>true</c>, moves the medium to the drive but does not prepare it for reading.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool LoadUnload(out byte[] senseBuffer, bool immediate, bool load, bool retense, bool endOfTape, bool hold, uint timeout, out double duration)
        {
            senseBuffer = new byte[32];
            byte[] cdb = new byte[6];
            byte[] buffer = new byte[0];
            bool sense;

            cdb[0] = (byte)ScsiCommands.LoadUnload;
            if (immediate)
                cdb[1] = 0x01;
            if (load)
                cdb[4] += 0x01;
            if (retense)
                cdb[4] += 0x02;
            if (endOfTape)
                cdb[4] += 0x04;
            if (hold)
                cdb[4] += 0x08;

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.None, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "LOAD UNLOAD (6) took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Positions the medium to the specified block in the current partition
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="lba">Logical block address.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Locate(out byte[] senseBuffer, uint lba, uint timeout, out double duration)
        {
            return Locate(out senseBuffer, false, false, true, 0, lba, timeout, out duration);
        }

        /// <summary>
        /// Positions the medium to the specified block in the specified partition
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="partition">Partition to position to.</param>
        /// <param name="lba">Logical block address.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Locate(out byte[] senseBuffer, byte partition, uint lba, uint timeout, out double duration)
        {
            return Locate(out senseBuffer, false, false, true, partition, lba, timeout, out duration);
        }

        /// <summary>
        /// Positions the medium to the specified block in the current partition
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="immediate">If set to <c>true</c>, return from the command immediately.</param>
        /// <param name="lba">Logical block address.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Locate(out byte[] senseBuffer, bool immediate, uint lba, uint timeout, out double duration)
        {
            return Locate(out senseBuffer, immediate, false, true, 0, lba, timeout, out duration);
        }

        /// <summary>
        /// Positions the medium to the specified block in the specified partition
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="immediate">If set to <c>true</c>, return from the command immediately.</param>
        /// <param name="partition">Partition to position to.</param>
        /// <param name="lba">Logical block address.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Locate(out byte[] senseBuffer, bool immediate, byte partition, uint lba, uint timeout, out double duration)
        {
            return Locate(out senseBuffer, immediate, false, true, partition, lba, timeout, out duration);
        }

        /// <summary>
        /// Positions the medium to the specified object identifier
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="immediate">If set to <c>true</c>, return from the command immediately.</param>
        /// <param name="blockType">If set to <c>true</c> object identifier is vendor specified.</param>
        /// <param name="changePartition">If set to <c>true</c> change partition.</param>
        /// <param name="partition">Partition to position to.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Locate(out byte[] senseBuffer, bool immediate, bool blockType, bool changePartition, byte partition, uint objectId, uint timeout, out double duration)
        {
            senseBuffer = new byte[32];
            byte[] cdb = new byte[10];
            byte[] buffer = new byte[0];
            bool sense;

            cdb[0] = (byte)ScsiCommands.Locate;
            if (immediate)
                cdb[1] += 0x01;
            if (changePartition)
                cdb[1] += 0x02;
            if (blockType)
                cdb[1] += 0x04;
            cdb[3] = (byte)((objectId & 0xFF000000) >> 24);
            cdb[4] = (byte)((objectId & 0xFF0000) >> 16);
            cdb[5] = (byte)((objectId & 0xFF00) >> 8);
            cdb[6] = (byte)(objectId & 0xFF);
            cdb[8] = partition;

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.None, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "LOCATE (10) took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Positions the medium to the specified block in the current partition
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="lba">Logical block address.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Locate16(out byte[] senseBuffer, ulong lba, uint timeout, out double duration)
        {
            return Locate16(out senseBuffer, false, false, SscLogicalIdTypes.ObjectId, false, 0, lba, timeout, out duration);
        }

        /// <summary>
        /// Positions the medium to the specified block in the specified partition
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="partition">Partition to position to.</param>
        /// <param name="lba">Logical block address.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Locate16(out byte[] senseBuffer, byte partition, ulong lba, uint timeout, out double duration)
        {
            return Locate16(out senseBuffer, false, true, SscLogicalIdTypes.ObjectId, false, partition, lba, timeout, out duration);
        }

        /// <summary>
        /// Positions the medium to the specified block in the current partition
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="immediate">If set to <c>true</c>, return from the command immediately.</param>
        /// <param name="lba">Logical block address.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Locate16(out byte[] senseBuffer, bool immediate, ulong lba, uint timeout, out double duration)
        {
            return Locate16(out senseBuffer, immediate, false, SscLogicalIdTypes.ObjectId, false, 0, lba, timeout, out duration);
        }

        /// <summary>
        /// Positions the medium to the specified block in the specified partition
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="immediate">If set to <c>true</c>, return from the command immediately.</param>
        /// <param name="partition">Partition to position to.</param>
        /// <param name="lba">Logical block address.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Locate16(out byte[] senseBuffer, bool immediate, byte partition, ulong lba, uint timeout, out double duration)
        {
            return Locate16(out senseBuffer, immediate, true, SscLogicalIdTypes.ObjectId, false, partition, lba, timeout, out duration);
        }

        /// <summary>
        /// Positions the medium to the specified object identifier
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="immediate">If set to <c>true</c>, return from the command immediately.</param>
        /// <param name="changePartition">If set to <c>true</c> change partition.</param>
        /// <param name="destType">Destination type.</param>
        /// <param name="bam">If set to <c>true</c> objectId is explicit.</param>
        /// <param name="partition">Partition to position to.</param>
        /// <param name="identifier">Destination identifier.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Locate16(out byte[] senseBuffer, bool immediate, bool changePartition, SscLogicalIdTypes destType, bool bam, byte partition, ulong identifier, uint timeout, out double duration)
        {
            senseBuffer = new byte[32];
            byte[] cdb = new byte[16];
            byte[] buffer = new byte[0];
            bool sense;
            byte[] idBytes = BitConverter.GetBytes(identifier);

            cdb[0] = (byte)ScsiCommands.Locate16;
            cdb[1] = (byte)((byte)destType << 3);
            if (immediate)
                cdb[1] += 0x01;
            if (changePartition)
                cdb[1] += 0x02;
            if (bam)
                cdb[2] = 0x01;
            cdb[3] = partition;

            cdb[4] = idBytes[7];
            cdb[5] = idBytes[6];
            cdb[6] = idBytes[5];
            cdb[7] = idBytes[4];
            cdb[8] = idBytes[3];
            cdb[9] = idBytes[2];
            cdb[10] = idBytes[1];
            cdb[11] = idBytes[0];

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.None, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "LOCATE (16) took {0} ms.", duration);

            return sense;
        }

        /*/// <summary>
        /// Reads the specified number of blocks from the medium
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Block size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Read6(out byte[] buffer, out byte[] senseBuffer, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return Read6(out buffer, out senseBuffer, false, true, blocks, blockSize, timeout, out duration);
        }*/

        /// <summary>
        /// Reads the specified number of bytes or of blocks from the medium
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication.</param>
        /// <param name="transferLen">How many bytes to read.</param>
        /// <param name="blockSize">Block size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Read6(out byte[] buffer, out byte[] senseBuffer, bool sili, uint transferLen, uint blockSize, uint timeout, out double duration)
        {
            return Read6(out buffer, out senseBuffer, sili, false, transferLen, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads the specified number of bytes or of blocks from the medium
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication. Cannot be set while <paramref name="fixedLen"/> is set also.</param>
        /// <param name="fixedLen">If set to <c>true</c> <paramref name="transferLen"/> indicates how many blocks to read of a fixed size.</param>
        /// <param name="transferLen">Transfer length in blocks or bytes depending of <paramref name="fixedLen"/> status.</param>
        /// <param name="blockSize">Block size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Read6(out byte[] buffer, out byte[] senseBuffer, bool sili, bool fixedLen, uint transferLen, uint blockSize, uint timeout, out double duration)
        {
            if (fixedLen)
                buffer = new byte[blockSize * transferLen];
            else
                buffer = new byte[transferLen];
            byte[] cdb = new byte[6];
            senseBuffer = new byte[32];
            bool sense;

            cdb[0] = (byte)ScsiCommands.Read6;
            if (fixedLen)
                cdb[1] += 0x01;
            if (sili)
                cdb[1] += 0x02;
            cdb[2] = (byte)((transferLen & 0xFF0000) >> 16);
            cdb[3] = (byte)((transferLen & 0xFF00) >> 8);
            cdb[4] = (byte)(transferLen & 0xFF);

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "READ (6) took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Reads a number of fixed-length blocks starting at specified object
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Object size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Read16(out byte[] buffer, out byte[] senseBuffer, bool sili, ulong objectId, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return Read16(out buffer, out senseBuffer, sili, false, 0, objectId, blocks, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads a number of fixed-length blocks starting at specified block from the specified partition
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication.</param>
        /// <param name="partition">Partition to read object from.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Object size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Read16(out byte[] buffer, out byte[] senseBuffer, bool sili, byte partition, ulong objectId, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return Read16(out buffer, out senseBuffer, sili, false, partition, objectId, blocks, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads a number of fixed-length blocks starting at specified object
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Object size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Read16(out byte[] buffer, out byte[] senseBuffer, ulong objectId, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return Read16(out buffer, out senseBuffer, false, true, 0, objectId, blocks, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads a number of fixed-length blocks starting at specified block from the specified partition
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="partition">Partition to read object from.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Object size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Read16(out byte[] buffer, out byte[] senseBuffer, byte partition, ulong objectId, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return Read16(out buffer, out senseBuffer, false, true, partition, objectId, blocks, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads a number of bytes or objects starting at specified object from the specified partition
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication. Cannot be set while <paramref name="fixedLen"/> is set also.</param>
        /// <param name="fixedLen">If set to <c>true</c> <paramref name="transferLen"/> indicates how many blocks to read of a fixed size.</param>
        /// <param name="partition">Partition to read object from.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="transferLen">Transfer length in blocks or bytes depending of <paramref name="fixedLen"/> status.</param>
        /// <param name="objectSize">Object size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Read16(out byte[] buffer, out byte[] senseBuffer, bool sili, bool fixedLen, byte partition, ulong objectId, uint transferLen, uint objectSize, uint timeout, out double duration)
        {
            if (fixedLen)
                buffer = new byte[objectSize * transferLen];
            else
                buffer = new byte[transferLen];
            byte[] cdb = new byte[6];
            senseBuffer = new byte[32];
            bool sense;
            byte[] idBytes = BitConverter.GetBytes(objectId);

            cdb[0] = (byte)ScsiCommands.Read16;
            if (fixedLen)
                cdb[1] += 0x01;
            if (sili)
                cdb[1] += 0x02;
            cdb[3] = partition;
            cdb[4] = idBytes[7];
            cdb[5] = idBytes[6];
            cdb[6] = idBytes[5];
            cdb[7] = idBytes[4];
            cdb[8] = idBytes[3];
            cdb[9] = idBytes[2];
            cdb[10] = idBytes[1];
            cdb[11] = idBytes[0];
            cdb[12] = (byte)((transferLen & 0xFF0000) >> 16);
            cdb[13] = (byte)((transferLen & 0xFF00) >> 8);
            cdb[14] = (byte)(transferLen & 0xFF);

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "READ (16) took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Requests the drive the maximum and minimum block size
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadBlockLimits(out byte[] buffer, out byte[] senseBuffer, uint timeout, out double duration)
        {
            buffer = new byte[6];
            byte[] cdb = new byte[6];
            senseBuffer = new byte[32];
            bool sense;

            cdb[0] = (byte)ScsiCommands.ReadBlockLimits;

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "READ BLOCK LIMITS took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Reports current reading/writing elements position on the medium
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadPosition(out byte[] buffer, out byte[] senseBuffer, uint timeout, out double duration)
        {
            return ReadPosition(out buffer, out senseBuffer, SscPositionForms.Short, timeout, out duration);
        }

        /// <summary>
        /// Reports current reading/writing elements position on the medium using 32 bytes response
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadPositionLong(out byte[] buffer, out byte[] senseBuffer, uint timeout, out double duration)
        {
            return ReadPosition(out buffer, out senseBuffer, SscPositionForms.Long, timeout, out duration);
        }

        /// <summary>
        /// Reports current reading/writing elements position on the medium
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="vendorType">Requests the position to be given in vendor-specified meaning.</param>
        /// <param name="longForm">Requests the response to be 32 bytes format.</param>
        /// <param name="totalPosition">Requests current logical position.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadPosition(out byte[] buffer, out byte[] senseBuffer, bool vendorType, bool longForm, bool totalPosition, uint timeout, out double duration)
        {
            byte responseForm = 0;
            if (vendorType)
                responseForm += 0x01;
            if (longForm)
                responseForm += 0x02;
            if (totalPosition)
                responseForm += 0x04;

            return ReadPosition(out buffer, out senseBuffer, (SscPositionForms)responseForm, timeout, out duration);
        }

        /// <summary>
        /// Reports current reading/writing elements position on the medium
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="responseForm">Response form.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadPosition(out byte[] buffer, out byte[] senseBuffer, SscPositionForms responseForm, uint timeout, out double duration)
        {
            switch (responseForm)
            {
                case SscPositionForms.Long:
                case SscPositionForms.OldLong:
                case SscPositionForms.OldLongTclpVendor:
                case SscPositionForms.OldLongVendor:
                case SscPositionForms.Extended:
                    buffer = new byte[32];
                    break;
                case SscPositionForms.OldTclp:
                case SscPositionForms.OldTclpVendor:
                case SscPositionForms.Short:
                case SscPositionForms.VendorShort:
                    buffer = new byte[20];
                    break;
                default:
                    buffer = new byte[32]; // Invalid
                    break;
            }
            byte[] cdb = new byte[10];
            senseBuffer = new byte[32];
            bool sense;

            cdb[0] = (byte)ScsiCommands.ReadPosition;
            cdb[1] = (byte)((byte)responseForm & 0x1F);
            if(responseForm == SscPositionForms.Extended)
            {
                cdb[7] = (byte)((buffer.Length & 0xFF00) >> 8);
                cdb[8] = (byte)(buffer.Length & 0xFF);
            }

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "READ POSITION took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Reads the specified number of blocks from the medium, backwards
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Block size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadReverse6(out byte[] buffer, out byte[] senseBuffer, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return ReadReverse6(out buffer, out senseBuffer, false, false, true, blocks, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads the specified number of bytes or of blocks from the medium, backwards
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication.</param>
        /// <param name="transferLen">How many bytes to read.</param>
        /// <param name="blockSize">Block size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadReverse6(out byte[] buffer, out byte[] senseBuffer, bool sili, uint transferLen, uint blockSize, uint timeout, out double duration)
        {
            return ReadReverse6(out buffer, out senseBuffer, false, sili, false, transferLen, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads the specified number of bytes or of blocks from the medium, backwards
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="byteOrder">If set to <c>true</c> drive should un-reverse the blocks and bytes</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication. Cannot be set while <paramref name="fixedLen"/> is set also.</param>
        /// <param name="fixedLen">If set to <c>true</c> <paramref name="transferLen"/> indicates how many blocks to read of a fixed size.</param>
        /// <param name="transferLen">Transfer length in blocks or bytes depending of <paramref name="fixedLen"/> status.</param>
        /// <param name="blockSize">Block size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadReverse6(out byte[] buffer, out byte[] senseBuffer, bool byteOrder, bool sili, bool fixedLen, uint transferLen, uint blockSize, uint timeout, out double duration)
        {
            if (fixedLen)
                buffer = new byte[blockSize * transferLen];
            else
                buffer = new byte[transferLen];
            byte[] cdb = new byte[6];
            senseBuffer = new byte[32];
            bool sense;

            cdb[0] = (byte)ScsiCommands.ReadReverse;
            if (fixedLen)
                cdb[1] += 0x01;
            if (sili)
                cdb[1] += 0x02;
            if (byteOrder)
                cdb[1] += 0x04;
            cdb[2] = (byte)((transferLen & 0xFF0000) >> 16);
            cdb[3] = (byte)((transferLen & 0xFF00) >> 8);
            cdb[4] = (byte)(transferLen & 0xFF);

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "READ REVERSE (6) took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Reads a number of fixed-length blocks starting at specified object, backwards
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Object size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadReverse16(out byte[] buffer, out byte[] senseBuffer, bool sili, ulong objectId, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return ReadReverse16(out buffer, out senseBuffer, false, sili, false, 0, objectId, blocks, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads a number of fixed-length blocks starting at specified block from the specified partition, backwards
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication.</param>
        /// <param name="partition">Partition to read object from.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Object size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadReverse16(out byte[] buffer, out byte[] senseBuffer, bool sili, byte partition, ulong objectId, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return ReadReverse16(out buffer, out senseBuffer, false, sili, false, partition, objectId, blocks, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads a number of fixed-length blocks starting at specified object, backwards
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Object size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadReverse16(out byte[] buffer, out byte[] senseBuffer, ulong objectId, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return ReadReverse16(out buffer, out senseBuffer, false, false, true, 0, objectId, blocks, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads a number of fixed-length blocks starting at specified block from the specified partition, backwards
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="partition">Partition to read object from.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Object size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadReverse16(out byte[] buffer, out byte[] senseBuffer, byte partition, ulong objectId, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return ReadReverse16(out buffer, out senseBuffer, false, false, true, partition, objectId, blocks, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads a number of bytes or objects starting at specified object from the specified partition, backwards
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="byteOrder">If set to <c>true</c> drive should un-reverse the blocks and bytes</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication. Cannot be set while <paramref name="fixedLen"/> is set also.</param>
        /// <param name="fixedLen">If set to <c>true</c> <paramref name="transferLen"/> indicates how many blocks to read of a fixed size.</param>
        /// <param name="partition">Partition to read object from.</param>
        /// <param name="objectId">Object identifier.</param>
        /// <param name="transferLen">Transfer length in blocks or bytes depending of <paramref name="fixedLen"/> status.</param>
        /// <param name="objectSize">Object size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReadReverse16(out byte[] buffer, out byte[] senseBuffer, bool byteOrder, bool sili, bool fixedLen, byte partition, ulong objectId, uint transferLen, uint objectSize, uint timeout, out double duration)
        {
            if (fixedLen)
                buffer = new byte[objectSize * transferLen];
            else
                buffer = new byte[transferLen];
            byte[] cdb = new byte[6];
            senseBuffer = new byte[32];
            bool sense;
            byte[] idBytes = BitConverter.GetBytes(objectId);

            cdb[0] = (byte)ScsiCommands.Read16;
            if (fixedLen)
                cdb[1] += 0x01;
            if (sili)
                cdb[1] += 0x02;
            if (byteOrder)
                cdb[1] += 0x04;
            cdb[3] = partition;
            cdb[4] = idBytes[7];
            cdb[5] = idBytes[6];
            cdb[6] = idBytes[5];
            cdb[7] = idBytes[4];
            cdb[8] = idBytes[3];
            cdb[9] = idBytes[2];
            cdb[10] = idBytes[1];
            cdb[11] = idBytes[0];
            cdb[12] = (byte)((transferLen & 0xFF0000) >> 16);
            cdb[13] = (byte)((transferLen & 0xFF00) >> 8);
            cdb[14] = (byte)(transferLen & 0xFF);

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "READ REVERSE (16) took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Reads the specified number of blocks from the device's buffer
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="blocks">How many blocks to read.</param>
        /// <param name="blockSize">Block size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool RecoverBufferedData(out byte[] buffer, out byte[] senseBuffer, uint blocks, uint blockSize, uint timeout, out double duration)
        {
            return RecoverBufferedData(out buffer, out senseBuffer, false, true, blocks, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads the specified number of bytes or of blocks from the device's buffer
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication.</param>
        /// <param name="transferLen">How many bytes to read.</param>
        /// <param name="blockSize">Block size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool RecoverBufferedData(out byte[] buffer, out byte[] senseBuffer, bool sili, uint transferLen, uint blockSize, uint timeout, out double duration)
        {
            return RecoverBufferedData(out buffer, out senseBuffer, sili, false, transferLen, blockSize, timeout, out duration);
        }

        /// <summary>
        /// Reads the specified number of bytes or of blocks from the device's buffer
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="sili">If set to <c>true</c> suppress the incorrect-length indication. Cannot be set while <paramref name="fixedLen"/> is set also.</param>
        /// <param name="fixedLen">If set to <c>true</c> <paramref name="transferLen"/> indicates how many blocks to read of a fixed size.</param>
        /// <param name="transferLen">Transfer length in blocks or bytes depending of <paramref name="fixedLen"/> status.</param>
        /// <param name="blockSize">Block size in bytes.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool RecoverBufferedData(out byte[] buffer, out byte[] senseBuffer, bool sili, bool fixedLen, uint transferLen, uint blockSize, uint timeout, out double duration)
        {
            if (fixedLen)
                buffer = new byte[blockSize * transferLen];
            else
                buffer = new byte[transferLen];
            byte[] cdb = new byte[6];
            senseBuffer = new byte[32];
            bool sense;

            cdb[0] = (byte)ScsiCommands.RecoverBufferedData;
            if (fixedLen)
                cdb[1] += 0x01;
            if (sili)
                cdb[1] += 0x02;
            cdb[2] = (byte)((transferLen & 0xFF0000) >> 16);
            cdb[3] = (byte)((transferLen & 0xFF00) >> 8);
            cdb[4] = (byte)(transferLen & 0xFF);

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "RECOVER BUFFERED DATA took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Requests the device to return descriptors for supported densities or medium types
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReportDensitySupport(out byte[] buffer, out byte[] senseBuffer, uint timeout, out double duration)
        {
            return ReportDensitySupport(out buffer, out senseBuffer, false, false, timeout, out duration);
        }

        /// <summary>
        /// Requests the device to return descriptors for supported densities or medium types
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="currentMedia">If set to <c>true</c> descriptors should apply to currently inserted media.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReportDensitySupport(out byte[] buffer, out byte[] senseBuffer, bool currentMedia, uint timeout, out double duration)
        {
            return ReportDensitySupport(out buffer, out senseBuffer, false, currentMedia, timeout, out duration);
        }

        /// <summary>
        /// Requests the device to return descriptors for supported densities or medium types
        /// </summary>
        /// <param name="buffer">Buffer.</param>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="mediumType">If set to <c>true</c> descriptors should be about medium types.</param>
        /// <param name="currentMedia">If set to <c>true</c> descriptors should apply to currently inserted media.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool ReportDensitySupport(out byte[] buffer, out byte[] senseBuffer, bool mediumType, bool currentMedia, uint timeout, out double duration)
        {
            buffer = new byte[256];
            byte[] cdb = new byte[10];
            senseBuffer = new byte[32];
            bool sense;

            cdb[0] = (byte)ScsiCommands.ReportDensitySupport;
            if (mediumType)
                cdb[1] += 0x01;
            if (currentMedia)
                cdb[1] += 0x02;
            cdb[7] = (byte)((buffer.Length & 0xFF00) >> 8);
            cdb[8] = (byte)(buffer.Length & 0xFF);

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out sense);
            error = lastError != 0;

            if (sense)
                return true;

            ushort availableLength = (ushort)(((int)buffer[0] << 8) + buffer[1] + 2);
            buffer = new byte[availableLength];
            cdb[7] = (byte)((buffer.Length & 0xFF00) >> 8);
            cdb[8] = (byte)(buffer.Length & 0xFF);
            senseBuffer = new byte[32];

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.In, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "REPORT DENSITY SUPPORT took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Positions the reading/writing element to the beginning of current partition
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Rewind(out byte[] senseBuffer, uint timeout, out double duration)
        {
            return Rewind(out senseBuffer, false, timeout, out duration);
        }

        /// <summary>
        /// Positions the reading/writing element to the beginning of current partition
        /// </summary>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="immediate">If set to <c>true</c> return from the command immediately.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool Rewind(out byte[] senseBuffer, bool immediate, uint timeout, out double duration)
        {
            senseBuffer = new byte[32];
            byte[] cdb = new byte[6];
            byte[] buffer = new byte[0];
            bool sense;

            cdb[0] = (byte)ScsiCommands.Rewind;
            if (immediate)
                cdb[1] += 0x01;

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.None, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "REWIND took {0} ms.", duration);

            return sense;
        }

        /// <summary>
        /// Selects the specified track
        /// </summary>
        /// <returns><c>true</c>, if select was tracked, <c>false</c> otherwise.</returns>
        /// <param name="senseBuffer">Sense buffer.</param>
        /// <param name="track">Track.</param>
        /// <param name="timeout">Timeout.</param>
        /// <param name="duration">Duration.</param>
        public bool TrackSelect(out byte[] senseBuffer, byte track, uint timeout, out double duration)
        {
            senseBuffer = new byte[32];
            byte[] cdb = new byte[6];
            byte[] buffer = new byte[0];
            bool sense;

            cdb[0] = (byte)ScsiCommands.TrackSelect;
            cdb[5] = track;

            lastError = SendScsiCommand(cdb, ref buffer, out senseBuffer, timeout, ScsiDirection.None, out duration, out sense);
            error = lastError != 0;

            DicConsole.DebugWriteLine("SCSI Device", "TRACK SELECT took {0} ms.", duration);

            return sense;
        }
    }
}