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303 lines
13 KiB
C#
303 lines
13 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : LiteOn.cs
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// Author(s) : Rebecca Wallander <sakcheen@gmail.com>
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//
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// Component : LiteOn vendor commands.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Contains vendor commands for Lite-On SCSI devices.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2025 Rebecca Wallander
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// ****************************************************************************/
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using System;
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using Aaru.CommonTypes.Enums;
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using Aaru.Console;
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namespace Aaru.Devices;
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public partial class Device
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{
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private uint _bufferOffset = 0;
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/// <summary>Reads a "raw" sector from DVD on Lite-On drives.</summary>
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/// <returns><c>true</c> if the command failed and <paramref name="senseBuffer" /> contains the sense buffer.</returns>
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/// <param name="buffer">Buffer where the ReadBuffer (RAW) response will be stored</param>
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/// <param name="senseBuffer">Sense buffer.</param>
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/// <param name="timeout">Timeout in seconds.</param>
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/// <param name="duration">Duration in milliseconds it took for the device to execute the command.</param>
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/// <param name="lba">Start block address.</param>
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/// <param name="transferLength">How many blocks to read.</param>
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/// <param name="layerbreak">The address in which the layerbreak occur</param>
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/// <param name="otp">Set to <c>true</c> if disk is Opposite Track Path (OTP)</param>
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public bool LiteOnReadRawDvd(out byte[] buffer, out byte[] senseBuffer, uint lba, uint transferLength, uint timeout,
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out double duration, uint layerbreak, bool otp)
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{
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_bufferOffset %= 714;
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bool sense;
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if(layerbreak > 0 && transferLength > 1 && lba + 0x30000 > layerbreak - 256 && lba + 0x30000 < layerbreak + 256)
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{
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buffer = new byte[transferLength * 2064];
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duration = 0;
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senseBuffer = new byte[64];
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return true;
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}
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if(714 - _bufferOffset < transferLength)
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{
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sense = LiteOnReadSectorsAcrossBufferBorder(out buffer,
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out senseBuffer,
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lba,
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transferLength,
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timeout,
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out duration,
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layerbreak,
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otp);
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}
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else
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{
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sense = LiteOnReadSectorsFromBuffer(out buffer,
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out senseBuffer,
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lba,
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transferLength,
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timeout,
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out duration,
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layerbreak,
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otp);
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}
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Error = LastError != 0;
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AaruConsole.DebugWriteLine(SCSI_MODULE_NAME, Localization.LiteOn_READ_DVD_RAW_took_0_ms, duration);
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return sense;
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}
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/// <summary>
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/// Reads the Lite-On device's memory buffer and returns raw sector data
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/// </summary>
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/// <param name="buffer">Buffer where the ReadBuffer (RAW) response will be stored</param>
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/// <param name="senseBuffer">Sense buffer.</param>
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/// <param name="bufferOffset">The offset to read the buffer at</param>
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/// <param name="transferLength"></param>
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/// <param name="timeout">Timeout in seconds.</param>
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/// <param name="duration">Duration in milliseconds it took for the device to execute the command.</param>
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/// <param name="lba">Start block address.</param>
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/// <returns><c>true</c> if the command failed and <paramref name="senseBuffer" /> contains the sense buffer.</returns>
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private bool LiteOnReadBuffer(out byte[] buffer, out byte[] senseBuffer, uint bufferOffset, uint transferLength,
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uint timeout, out double duration, uint lba)
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{
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// We need to fill the buffer before reading it with the ReadBuffer command. We don't care about sense,
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// because the data can be wrong anyway, so we check the buffer data later instead.
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Read12(out _, out _, 0, false, false, false, false, lba, 2048, 0, 16, false, timeout, out duration);
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senseBuffer = new byte[64];
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var cdb = new byte[10];
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buffer = new byte[transferLength];
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cdb[0] = (byte)ScsiCommands.ReadBuffer;
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cdb[1] = 0x01;
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cdb[2] = 0x01;
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cdb[3] = (byte)((bufferOffset & 0xFF0000) >> 16);
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cdb[4] = (byte)((bufferOffset & 0xFF00) >> 8);
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cdb[5] = (byte)(bufferOffset & 0xFF);
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cdb[6] = (byte)((buffer.Length & 0xFF0000) >> 16);
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cdb[7] = (byte)((buffer.Length & 0xFF00) >> 8);
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cdb[8] = (byte)(buffer.Length & 0xFF);
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LastError = SendScsiCommand(cdb,
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ref buffer,
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out senseBuffer,
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timeout,
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ScsiDirection.In,
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out duration,
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out bool sense);
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return sense;
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}
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/// <summary>
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/// Reads raw sectors from the device's memory
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/// </summary>
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/// <returns><c>true</c> if the command failed and <paramref name="senseBuffer" /> contains the sense buffer.</returns>
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/// <param name="buffer">Buffer where the ReadBuffer (RAW) response will be stored</param>
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/// <param name="senseBuffer">Sense buffer.</param>
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/// <param name="timeout">Timeout in seconds.</param>
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/// <param name="duration">Duration in milliseconds it took for the device to execute the command.</param>
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/// <param name="lba">Start block address.</param>
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/// <param name="transferLength">How many blocks to read.</param>
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/// <param name="layerbreak">The address in which the layerbreak occur</param>
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/// <param name="otp">Set to <c>true</c> if disk is Opposite Track Path (OTP)</param>
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private bool LiteOnReadSectorsFromBuffer(out byte[] buffer, out byte[] senseBuffer, uint lba, uint transferLength,
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uint timeout, out double duration, uint layerbreak, bool otp)
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{
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bool sense = LiteOnReadBuffer(out buffer,
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out senseBuffer,
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_bufferOffset * 2384,
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transferLength * 2384,
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timeout,
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out duration,
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lba);
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byte[] deinterleaved = DeinterleaveEccBlock(buffer, transferLength);
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if(!CheckSectorNumber(deinterleaved, lba, transferLength, layerbreak, true))
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{
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// Buffer offset lost, try to find it again
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int offset = FindBufferOffset(lba, timeout, layerbreak, otp);
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if(offset == -1) return true;
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_bufferOffset = (uint)offset;
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sense = LiteOnReadBuffer(out buffer,
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out senseBuffer,
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_bufferOffset * 2384,
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transferLength * 2384,
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timeout,
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out duration,
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lba);
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deinterleaved = DeinterleaveEccBlock(buffer, transferLength);
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if(!CheckSectorNumber(deinterleaved, lba, transferLength, layerbreak, otp)) return true;
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}
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if(_decoding.Scramble(deinterleaved, transferLength, out byte[] scrambledBuffer) != ErrorNumber.NoError)
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return true;
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buffer = scrambledBuffer;
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_bufferOffset += transferLength;
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return sense;
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}
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/// <summary>
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/// Reads raw sectors when they cross the device's memory border
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/// </summary>
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/// <returns><c>true</c> if the command failed and <paramref name="senseBuffer" /> contains the sense buffer.</returns>
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/// <param name="buffer">Buffer where the ReadBuffer (RAW) response will be stored</param>
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/// <param name="senseBuffer">Sense buffer.</param>
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/// <param name="timeout">Timeout in seconds.</param>
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/// <param name="duration">Duration in milliseconds it took for the device to execute the command.</param>
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/// <param name="lba">Start block address.</param>
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/// <param name="transferLength">How many blocks to read.</param>
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/// <param name="layerbreak">The address in which the layerbreak occur</param>
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/// <param name="otp">Set to <c>true</c> if disk is Opposite Track Path (OTP)</param>
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private bool LiteOnReadSectorsAcrossBufferBorder(out byte[] buffer, out byte[] senseBuffer, uint lba,
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uint transferLength, uint timeout, out double duration,
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uint layerbreak, bool otp)
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{
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uint newTransferLength1 = 714 - _bufferOffset;
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uint newTransferLength2 = transferLength - newTransferLength1;
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bool sense1 = LiteOnReadBuffer(out byte[] buffer1,
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out byte[] _,
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_bufferOffset * 2384,
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newTransferLength1 * 2384,
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timeout,
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out double duration1,
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lba);
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bool sense2 = LiteOnReadBuffer(out byte[] buffer2,
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out byte[] _,
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0,
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newTransferLength2 * 2384,
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timeout,
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out double duration2,
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lba);
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senseBuffer = new byte[64]; // TODO
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buffer = new byte[2384 * transferLength];
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Array.Copy(buffer1, buffer, buffer1.Length);
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Array.Copy(buffer2, 0, buffer, buffer1.Length, buffer2.Length);
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duration = duration1 + duration2;
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byte[] deinterleaved = DeinterleaveEccBlock(buffer, transferLength);
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if(!CheckSectorNumber(deinterleaved, lba, transferLength, layerbreak, otp)) return true;
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if(_decoding.Scramble(deinterleaved, transferLength, out byte[] scrambledBuffer) != ErrorNumber.NoError)
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return true;
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buffer = scrambledBuffer;
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_bufferOffset = newTransferLength2;
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return sense1 && sense2;
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}
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/// <summary>
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/// Sometimes the offset on the drive memory can get lost. This tries to find it again.
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/// </summary>
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/// <param name="lba">The expected LBA</param>
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/// <param name="timeout">Timeout in seconds.</param>
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/// <param name="layerbreak">The address in which the layerbreak occur</param>
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/// <param name="otp">Set to <c>true</c> if disk is Opposite Track Path (OTP)</param>
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/// <returns>The offset on the device memory, or -1 if not found</returns>
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private int FindBufferOffset(uint lba, uint timeout, uint layerbreak, bool otp)
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{
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for(uint i = 0; i < 714; i++)
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{
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LiteOnReadBuffer(out byte[] buffer, out byte[] _, i * 2384, 2384, timeout, out double _, lba);
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if(CheckSectorNumber(buffer, lba, 1, layerbreak, otp))
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{
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return (int)i;
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}
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}
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return -1;
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}
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/// <summary>
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/// Deinterleave the ECC block stored within a 2384 byte raw sector
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/// </summary>
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/// <param name="buffer">Data buffer</param>
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/// <param name="transferLength">How many blocks in buffer</param>
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/// <param name="deinterleaved"></param>
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/// <returns>The deinterleaved sectors</returns>
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private static byte[] DeinterleaveEccBlock(byte[] buffer, uint transferLength)
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{
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// TODO: Save ECC instead of just throwing it away
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var deinterleaved = new byte[2064 * transferLength];
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for(var j = 0; j < transferLength; j++)
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{
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for(var i = 0; i < 12; i++)
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{
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Array.Copy(buffer, (j * 2384) + (i * 182), deinterleaved, (j * 2064) + (i * 172), 172);
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}
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}
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return deinterleaved;
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}
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} |