mirror of
https://github.com/aaru-dps/Aaru.git
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731 lines
33 KiB
C#
731 lines
33 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : ReadBuffer.cs
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// Author(s) : Rebecca Wallander <sakcheen@gmail.com>
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//
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// Component : SCSI READ BUFFER command.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Contains generic SCSI READ BUFFER command implementation.
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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 © 2011-2026 Rebecca Wallander
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// ****************************************************************************/
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using System;
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using System.Collections.Generic;
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using Aaru.CommonTypes.Enums;
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using Aaru.Helpers;
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using Aaru.Logging;
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namespace Aaru.Devices;
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public partial class Device
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{
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// ReadBuffer 3C detection fields
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private byte _detectedReadBufferMode; // Detected buffer mode (0x00, 0x01, 0x02)
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private byte _detectedReadBufferId; // Detected buffer ID (0x00, 0x01, 0x02)
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private uint _detectedBufferStride; // Detected stride in bytes per sector
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private bool _readBuffer3CDetected; // Flag to track if detection has been performed
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// Buffer format and management fields
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private enum BufferFormat
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{
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Unknown = 0,
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FullEccInterleaved,
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PoOnly,
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SectorDataOnly,
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FullEccWithPadding
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}
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private uint _bufferOffset;
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private uint _bufferCapacityInSectors;
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private BufferFormat _bufferFormat;
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private uint _totalSectorsRead; // Tracks cumulative sectors read successfully since last buffer reset
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/// <summary>Reads from device buffer using SCSI READ BUFFER command with specified variant</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 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">Number of bytes to read</param>
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/// <param name="timeout">Timeout in seconds</param>
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/// <param name="duration">Duration in milliseconds</param>
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/// <param name="mode">Buffer mode (CDB byte 1, e.g., 0x01 for data, 0x02 for descriptors)</param>
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/// <param name="bufferId">Buffer ID (CDB byte 2, e.g., 0x01, 0x00)</param>
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public bool ScsiReadBuffer(out byte[] buffer, out ReadOnlySpan<byte> senseBuffer, uint bufferOffset,
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uint transferLength, uint timeout, out double duration, byte mode, byte bufferId)
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{
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senseBuffer = SenseBuffer;
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Span<byte> cdb = CdbBuffer[..10];
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cdb.Clear();
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buffer = new byte[transferLength];
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cdb[0] = (byte)ScsiCommands.ReadBuffer;
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cdb[1] = mode;
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cdb[2] = bufferId;
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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, ref buffer, timeout, ScsiDirection.In, out duration, out bool sense);
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return sense;
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}
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/// <summary>
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/// Makes sure the data's sector number is the one expected.
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/// </summary>
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/// <param name="buffer">Data buffer</param>
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/// <param name="firstLba">First consecutive LBA of the buffer</param>
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/// <param name="transferLength">How many blocks in buffer</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><c>false</c> if any sector is not matching expected value, else <c>true</c></returns>
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static bool CheckSectorNumber(IReadOnlyList<byte> buffer, uint firstLba, uint transferLength, uint layerbreak,
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bool otp)
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{
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for(var i = 0; i < transferLength; i++)
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{
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var layer = (byte)(buffer[0 + 2064 * i] & 0x1);
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byte[] sectorBuffer = [0x0, buffer[1 + 2064 * i], buffer[2 + 2064 * i], buffer[3 + 2064 * i]];
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uint sectorNumber = BigEndianBitConverter.ToUInt32(sectorBuffer, 0);
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if(otp)
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{
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if(!IsCorrectDlOtpPsn(sectorNumber, (ulong)(firstLba + i), layer, layerbreak)) return false;
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}
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else
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{
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if(!IsCorrectSlPsn(sectorNumber, (ulong)(firstLba + i))) return false;
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}
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}
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return true;
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}
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/// <summary>
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/// Checks if the PSN for a raw sector matches the expected LBA for a single layer DVD
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/// </summary>
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/// <param name="sectorNumber">The Sector Number from Identification Data (ID)</param>
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/// <param name="lba">The expected LBA</param>
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/// <returns><c>false</c> if the sector is not matching expected value, else <c>true</c></returns>
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static bool IsCorrectSlPsn(uint sectorNumber, ulong lba) => sectorNumber == lba + 0x30000;
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/// <summary>
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/// Checks if the PSN for a raw sector matches the expected LBA for a dual layer DVD with parallel track path
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/// </summary>
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/// <param name="sectorNumber">The Sector Number from Identification Data (ID)</param>
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/// <param name="lba">The expected LBA</param>
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/// <param name="layer">Layer number</param>
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/// <param name="layerbreak">The address in which the layerbreak occur</param>
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/// <returns><c>false</c> if the sector is not matching expected value, else <c>true</c></returns>
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static bool IsCorrectDlPtpPsn(uint sectorNumber, ulong lba, byte layer, uint layerbreak)
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{
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if(layer != 1) return IsCorrectSlPsn(sectorNumber, lba);
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return sectorNumber == lba - layerbreak + 0x30000;
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}
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/// <summary>
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/// Checks if the PSN for a raw sector matches the expected LBA for a dual layer DVD with opposite track path
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/// </summary>
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/// <param name="sectorNumber">The Sector Number from Identification Data (ID)</param>
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/// <param name="lba">The expected LBA</param>
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/// <param name="layer">Layer number</param>
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/// <param name="layerbreak">The address in which the layerbreak occur</param>
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/// <returns><c>false</c> if the sector is not matching expected value, else <c>true</c></returns>
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static bool IsCorrectDlOtpPsn(uint sectorNumber, ulong lba, byte layer, uint layerbreak)
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{
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if(layer != 1) return IsCorrectSlPsn(sectorNumber, lba);
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ulong n = ~(layerbreak + 1 + (layerbreak - (lba + 0x30000))) & 0x00ffffff;
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return sectorNumber == n;
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}
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/// <summary>
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/// Deinterleave full ECC block with interleaved PI (e.g., 2384 bytes)
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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="stride">Bytes per sector in buffer</param>
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/// <returns>The deinterleaved sectors</returns>
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static byte[] DeinterleaveFullEccInterleaved(byte[] buffer, uint transferLength, uint stride)
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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++) Array.Copy(buffer, j * stride + i * 182, deinterleaved, j * 2064 + i * 172, 172);
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}
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return deinterleaved;
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}
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/// <summary>
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/// Extract sector data from PO-only format (e.g., 2236 bytes)
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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="stride">Bytes per sector in buffer</param>
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/// <returns>The extracted sector data</returns>
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static byte[] DeinterleavePoOnly(byte[] buffer, uint transferLength, uint stride)
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{
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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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Array.Copy(buffer, j * stride, deinterleaved, j * 2064, 2064);
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}
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return deinterleaved;
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}
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/// <summary>
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/// Deinterleave full ECC block with padding (e.g., 2816 bytes)
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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="stride">Bytes per sector in buffer</param>
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/// <returns>The deinterleaved sectors</returns>
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static byte[] DeinterleaveFullEccWithPadding(byte[] buffer, uint transferLength, uint stride)
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{
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// Same as FullEccInterleaved, padding is ignored
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return DeinterleaveFullEccInterleaved(buffer, transferLength, stride);
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}
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/// <summary>
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/// Detects which ReadBuffer 3C command variant works for this drive
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/// Tries variants in order: 3c0000, 3c0100, 3c0101, 3c0102, 3c0200
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/// </summary>
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/// <param name="lba">LBA to use for filling the buffer</param>
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/// <param name="timeout">Timeout in seconds</param>
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/// <param name="duration">Duration in milliseconds</param>
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/// <returns>Tuple with (mode, bufferId) if a working variant is found, null otherwise</returns>
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private (byte mode, byte bufferId)? DetectReadBufferVariant(uint lba, uint timeout, out double duration)
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{
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duration = 0;
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// Variants to try in order: 3c0000, 3c0100, 3c0101, 3c0102, 3c0200
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(byte mode, byte bufferId)[] variants =
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[
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(0x00, 0x00), // 3c0000
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(0x01, 0x00), // 3c0100
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(0x01, 0x01), // 3c0101
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(0x01, 0x02), // 3c0102
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(0x02, 0x00) // 3c0200
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];
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// Fill buffer with sectors 0-16
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Read12(out _, out _, 0, false, false, false, false, lba, 2048, 0, 16, false, timeout, out double readDuration);
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duration += readDuration;
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foreach((byte mode, byte bufferId) variant in variants)
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{
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// Try to read buffer with this variant
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// Read enough for at least 3 sectors (minimum needed for stride detection)
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uint readSize = 3 * 3000; // Enough for 3 sectors even with large stride
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bool sense = ScsiReadBuffer(out byte[] buffer, out _, 0, readSize, timeout, out double readBufferDuration,
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variant.mode, variant.bufferId);
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duration += readBufferDuration;
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// Check if command succeeded, returned valid data, and has correct sector header (00 03 00)
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if(!sense && buffer != null && buffer.Length >= 2236 * 3)
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{
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// Validate that the data starts with the expected DVD sector header pattern
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if(buffer.Length >= 3 &&
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buffer[0] == 0x00 &&
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buffer[1] == 0x03 &&
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buffer[2] == 0x00)
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{
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AaruLogging.Debug(SCSI_MODULE_NAME, "ReadBuffer 3C variant {0:x2}{1:x2} detected", variant.mode,
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variant.bufferId);
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return (variant.mode, variant.bufferId);
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}
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AaruLogging.Debug(SCSI_MODULE_NAME,
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"ReadBuffer 3C variant {0:x2}{1:x2} returned data but header pattern incorrect",
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variant.mode, variant.bufferId);
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}
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}
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AaruLogging.Debug(SCSI_MODULE_NAME, "No working ReadBuffer 3C variant found");
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return null;
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}
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/// <summary>
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/// Detects the stride (bytes per sector) in the buffer by searching for
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/// the 00 03 00 pattern that appears at the start of each sector
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/// </summary>
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/// <param name="lba">LBA to use for filling the buffer (sectors 0-16)</param>
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/// <param name="timeout">Timeout in seconds</param>
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/// <param name="mode">Buffer mode to use</param>
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/// <param name="bufferId">Buffer ID to use</param>
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/// <param name="duration">Duration in milliseconds</param>
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/// <returns>Detected stride in bytes, or 0 if detection failed</returns>
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private uint DetectBufferStride(uint lba, uint timeout, byte mode, byte bufferId, out double duration)
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{
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// Fill buffer with sectors 0-16
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Read12(out _, out _, 0, false, false, false, false, lba, 2048, 0, 16, false, timeout, out duration);
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// Read a large buffer chunk (enough for 16+ sectors)
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uint readSize = 16 * 3000; // Enough for 16 sectors even with large stride
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bool sense = ScsiReadBuffer(out byte[] buffer, out _, 0, readSize, timeout, out double readDuration, mode,
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bufferId);
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duration += readDuration;
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if(sense || buffer == null || buffer.Length < 2236 * 3) // Need at least 3 sectors worth
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{
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AaruLogging.Debug(SCSI_MODULE_NAME,
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"ReadBuffer stride detection failed, sense or buffer too small, using default");
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return 0; // Detection failed
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}
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// Search for pattern 00 03 00 starting from beginning
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// Find first occurrence
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int firstOffset = -1;
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for(int i = 0; i < buffer.Length - 3; i++)
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{
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if(buffer[i] == 0x00 && buffer[i + 1] == 0x03 && buffer[i + 2] == 0x00)
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{
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firstOffset = i;
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break;
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}
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}
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if(firstOffset != 0)
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{
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AaruLogging.Debug(SCSI_MODULE_NAME,
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"ReadBuffer stride detection failed, pattern not at start, using default");
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return 0; // Pattern not at start
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}
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// Find second occurrence to calculate stride
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int secondOffset = -1;
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for(int i = firstOffset + 2064; i < Math.Min(firstOffset + 2500, buffer.Length - 3); i++)
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{
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if(buffer[i] == 0x00 && buffer[i + 1] == 0x03 && buffer[i + 2] == 0x00)
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{
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secondOffset = i;
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break;
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}
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}
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if(secondOffset == -1)
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{
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AaruLogging.Debug(SCSI_MODULE_NAME,
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"ReadBuffer stride detection failed, couldn't find second sector, using default");
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return 0; // Couldn't find second sector
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}
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uint stride = (uint)(secondOffset - firstOffset);
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// Verify stride by checking 3rd and 4th sectors
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for(int sectorNum = 2; sectorNum <= 3; sectorNum++)
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{
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int expectedOffset = (int)(firstOffset + stride * sectorNum);
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if(expectedOffset + 3 >= buffer.Length) break;
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if(buffer[expectedOffset] != 0x00 ||
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buffer[expectedOffset + 1] != 0x03 ||
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buffer[expectedOffset + 2] != 0x00)
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{
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return 0; // Verification failed
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}
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}
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AaruLogging.Debug(SCSI_MODULE_NAME, "ReadBuffer stride detection succeeded, stride: {0}", stride);
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return stride;
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}
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/// <summary>
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/// Detects ReadBuffer 3C support: finds working variant and stride
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/// </summary>
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/// <param name="lba">LBA to use for detection</param>
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/// <param name="timeout">Timeout in seconds</param>
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/// <param name="duration">Duration in milliseconds</param>
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/// <returns><c>true</c> if detection succeeded, <c>false</c> otherwise</returns>
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private bool DetectReadBuffer3C(uint lba, uint timeout, out double duration)
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{
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duration = 0;
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// If already detected, return success
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if(_readBuffer3CDetected)
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{
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if(_detectedBufferStride == 0) return false;
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return true;
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}
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// Try to detect variant
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(byte mode, byte bufferId)? variant = DetectReadBufferVariant(lba, timeout, out double variantDuration);
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duration += variantDuration;
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if(!variant.HasValue)
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{
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_readBuffer3CDetected = true; // Mark as attempted even if failed
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return false;
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}
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_detectedReadBufferMode = variant.Value.mode;
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_detectedReadBufferId = variant.Value.bufferId;
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// Detect stride using the found variant
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uint stride = DetectBufferStride(lba, timeout, _detectedReadBufferMode, _detectedReadBufferId,
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out double strideDuration);
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duration += strideDuration;
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if(stride == 0 || stride < 2064 || stride > 10000)
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{
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AaruLogging.Debug(SCSI_MODULE_NAME,
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"ReadBuffer 3C stride detection failed or invalid stride: {0}, using default", stride);
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_detectedBufferStride = 2384; // Default to known value
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_readBuffer3CDetected = true;
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return false; // Detection partially succeeded but stride failed
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}
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_detectedBufferStride = stride;
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_readBuffer3CDetected = true;
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AaruLogging.Debug(SCSI_MODULE_NAME,
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"ReadBuffer 3C detection succeeded, variant: {0:x2}{1:x2}, stride: {2}",
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_detectedReadBufferMode, _detectedReadBufferId, _detectedBufferStride);
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return true;
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}
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/// <summary>Reads a "raw" sector from DVD using ReadBuffer 3C command.</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="lba">Start block address.</param>
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/// <param name="transferLength">How many blocks to read.</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="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 ReadBuffer3CRawDvd(out byte[] buffer, out ReadOnlySpan<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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// Detect ReadBuffer 3C variant and stride on first call
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if(!_readBuffer3CDetected)
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{
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bool detected = DetectReadBuffer3C(lba, timeout, out double detectDuration);
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if(!detected || _detectedBufferStride == 0 || _detectedBufferStride < 2064 || _detectedBufferStride > 10000)
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{
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// Detection failed - raw reading is not supported on this drive
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AaruLogging.Debug(SCSI_MODULE_NAME,
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"ReadBuffer 3C detection failed - raw reading is not supported on this drive");
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buffer = Array.Empty<byte>();
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senseBuffer = SenseBuffer;
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duration = detectDuration;
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Error = true;
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_readBuffer3CDetected = true;
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return true; // Return failure - raw reading not supported
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}
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// Detect format based on stride
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_bufferFormat = _detectedBufferStride switch
|
|
{
|
|
2064 => BufferFormat.SectorDataOnly,
|
|
2236 => BufferFormat.PoOnly,
|
|
2384 => BufferFormat.FullEccInterleaved,
|
|
> 2384 => BufferFormat.FullEccWithPadding,
|
|
_ => BufferFormat.FullEccInterleaved // Default for backward compatibility
|
|
};
|
|
|
|
AaruLogging.Debug(SCSI_MODULE_NAME,
|
|
"ReadBuffer 3C buffer format detected based on stride: {0}, format: {1}",
|
|
_detectedBufferStride, _bufferFormat);
|
|
|
|
// Initialize buffer capacity with default value (will be refined dynamically when offset is lost)
|
|
_bufferCapacityInSectors = 714;
|
|
_totalSectorsRead = 0; // Initialize tracking for dynamic capacity detection
|
|
_readBuffer3CDetected = true;
|
|
}
|
|
|
|
_bufferOffset %= _bufferCapacityInSectors;
|
|
|
|
bool sense;
|
|
|
|
if(layerbreak > 0 && transferLength > 1 && lba + 0x30000 > layerbreak - 256 && lba + 0x30000 < layerbreak + 256)
|
|
{
|
|
buffer = new byte[transferLength * 2064];
|
|
duration = 0;
|
|
senseBuffer = SenseBuffer;
|
|
|
|
return true;
|
|
}
|
|
|
|
if(_bufferCapacityInSectors - _bufferOffset < transferLength)
|
|
{
|
|
sense = ReadSectorsAcrossBufferBorder(out buffer,
|
|
out senseBuffer,
|
|
lba,
|
|
transferLength,
|
|
timeout,
|
|
out duration,
|
|
layerbreak,
|
|
otp);
|
|
}
|
|
else
|
|
{
|
|
sense = ReadSectorsFromBuffer(out buffer,
|
|
out senseBuffer,
|
|
lba,
|
|
transferLength,
|
|
timeout,
|
|
out duration,
|
|
layerbreak,
|
|
otp);
|
|
}
|
|
|
|
Error = LastError != 0;
|
|
|
|
AaruLogging.Debug(SCSI_MODULE_NAME, "ReadBuffer 3C READ DVD RAW took {0} ms", duration);
|
|
|
|
return sense;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Reads the device's memory buffer and returns raw sector data
|
|
/// </summary>
|
|
/// <param name="buffer">Buffer where the ReadBuffer (RAW) response will be stored</param>
|
|
/// <param name="senseBuffer">Sense buffer.</param>
|
|
/// <param name="bufferOffset">The offset to read the buffer at</param>
|
|
/// <param name="transferLength">How many blocks to read.</param>
|
|
/// <param name="timeout">Timeout in seconds.</param>
|
|
/// <param name="duration">Duration in milliseconds it took for the device to execute the command.</param>
|
|
/// <param name="lba">Start block address.</param>
|
|
/// <returns><c>true</c> if the command failed and <paramref name="senseBuffer" /> contains the sense buffer.</returns>
|
|
private bool ReadBuffer3CInternal(out byte[] buffer, out ReadOnlySpan<byte> senseBuffer, uint bufferOffset,
|
|
uint transferLength, uint timeout, out double duration, uint lba)
|
|
{
|
|
// We need to fill the buffer before reading it with the ReadBuffer command. We don't care about sense,
|
|
// because the data can be wrong anyway, so we check the buffer data later instead.
|
|
Read12(out _, out _, 0, false, false, false, false, lba, 2048, 0, 16, false, timeout, out duration);
|
|
|
|
// Use generic ReadBuffer method with detected variant
|
|
return ScsiReadBuffer(out buffer, out senseBuffer, bufferOffset, transferLength, timeout, out duration,
|
|
_detectedReadBufferMode, _detectedReadBufferId);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Reads raw sectors from the device's memory
|
|
/// </summary>
|
|
/// <returns><c>true</c> if the command failed and <paramref name="senseBuffer" /> contains the sense buffer.</returns>
|
|
/// <param name="buffer">Buffer where the ReadBuffer (RAW) response will be stored</param>
|
|
/// <param name="senseBuffer">Sense buffer.</param>
|
|
/// <param name="timeout">Timeout in seconds.</param>
|
|
/// <param name="duration">Duration in milliseconds it took for the device to execute the command.</param>
|
|
/// <param name="lba">Start block address.</param>
|
|
/// <param name="transferLength">How many blocks to read.</param>
|
|
/// <param name="layerbreak">The address in which the layerbreak occur</param>
|
|
/// <param name="otp">Set to <c>true</c> if disk is Opposite Track Path (OTP)</param>
|
|
private bool ReadSectorsFromBuffer(out byte[] buffer, out ReadOnlySpan<byte> senseBuffer, uint lba,
|
|
uint transferLength, uint timeout, out double duration, uint layerbreak,
|
|
bool otp)
|
|
{
|
|
bool sense = ReadBuffer3CInternal(out buffer,
|
|
out senseBuffer,
|
|
_bufferOffset * _detectedBufferStride,
|
|
transferLength * _detectedBufferStride,
|
|
timeout,
|
|
out duration,
|
|
lba);
|
|
|
|
byte[] deinterleaved = DeinterleaveEccBlock(buffer, transferLength, _detectedBufferStride, _bufferFormat);
|
|
|
|
if(!CheckSectorNumber(deinterleaved, lba, transferLength, layerbreak, true))
|
|
{
|
|
// Buffer offset lost - this means we've wrapped around
|
|
// Use the number of sectors read to detect buffer capacity
|
|
if(_totalSectorsRead > 0 && _totalSectorsRead >= 16 && _totalSectorsRead <= 2000)
|
|
{
|
|
uint detectedCapacity = _totalSectorsRead;
|
|
uint oldCapacity = _bufferCapacityInSectors;
|
|
|
|
// If we already have a capacity, verify new detection is consistent
|
|
if(_bufferCapacityInSectors == 714 || // Update if using default
|
|
(detectedCapacity >= _bufferCapacityInSectors * 9 / 10 &&
|
|
detectedCapacity <= _bufferCapacityInSectors * 11 / 10)) // Or within 10%
|
|
{
|
|
_bufferCapacityInSectors = detectedCapacity;
|
|
AaruLogging.Debug(SCSI_MODULE_NAME,
|
|
"Buffer capacity dynamically detected: {0} sectors (was {1})",
|
|
detectedCapacity, oldCapacity);
|
|
}
|
|
}
|
|
|
|
// Reset tracking for next cycle
|
|
_totalSectorsRead = 0;
|
|
|
|
// Buffer offset lost, try to find it again
|
|
int offset = FindBufferOffset(lba, timeout, layerbreak, otp);
|
|
|
|
if(offset == -1) return true;
|
|
|
|
_bufferOffset = (uint)offset;
|
|
|
|
sense = ReadBuffer3CInternal(out buffer,
|
|
out senseBuffer,
|
|
_bufferOffset * _detectedBufferStride,
|
|
transferLength * _detectedBufferStride,
|
|
timeout,
|
|
out duration,
|
|
lba);
|
|
|
|
deinterleaved = DeinterleaveEccBlock(buffer, transferLength, _detectedBufferStride, _bufferFormat);
|
|
|
|
if(!CheckSectorNumber(deinterleaved, lba, transferLength, layerbreak, otp)) return true;
|
|
}
|
|
|
|
if(_decoding.Scramble(deinterleaved, transferLength, out byte[] scrambledBuffer) != ErrorNumber.NoError)
|
|
return true;
|
|
|
|
buffer = scrambledBuffer;
|
|
|
|
_bufferOffset += transferLength;
|
|
_totalSectorsRead += transferLength; // Track successful read for capacity detection
|
|
|
|
return sense;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Reads raw sectors when they cross the device's memory border
|
|
/// </summary>
|
|
/// <returns><c>true</c> if the command failed and <paramref name="senseBuffer" /> contains the sense buffer.</returns>
|
|
/// <param name="buffer">Buffer where the ReadBuffer (RAW) response will be stored</param>
|
|
/// <param name="senseBuffer">Sense buffer.</param>
|
|
/// <param name="timeout">Timeout in seconds.</param>
|
|
/// <param name="duration">Duration in milliseconds it took for the device to execute the command.</param>
|
|
/// <param name="lba">Start block address.</param>
|
|
/// <param name="transferLength">How many blocks to read.</param>
|
|
/// <param name="layerbreak">The address in which the layerbreak occur</param>
|
|
/// <param name="otp">Set to <c>true</c> if disk is Opposite Track Path (OTP)</param>
|
|
private bool ReadSectorsAcrossBufferBorder(out byte[] buffer, out ReadOnlySpan<byte> senseBuffer, uint lba,
|
|
uint transferLength, uint timeout, out double duration,
|
|
uint layerbreak, bool otp)
|
|
{
|
|
uint newTransferLength1 = _bufferCapacityInSectors - _bufferOffset;
|
|
uint newTransferLength2 = transferLength - newTransferLength1;
|
|
|
|
bool sense1 = ReadBuffer3CInternal(out byte[] buffer1,
|
|
out _,
|
|
_bufferOffset * _detectedBufferStride,
|
|
newTransferLength1 * _detectedBufferStride,
|
|
timeout,
|
|
out double duration1,
|
|
lba);
|
|
|
|
bool sense2 = ReadBuffer3CInternal(out byte[] buffer2,
|
|
out _,
|
|
0,
|
|
newTransferLength2 * _detectedBufferStride,
|
|
timeout,
|
|
out double duration2,
|
|
lba);
|
|
|
|
senseBuffer = SenseBuffer; // TODO
|
|
|
|
buffer = new byte[_detectedBufferStride * transferLength];
|
|
Array.Copy(buffer1, buffer, buffer1.Length);
|
|
Array.Copy(buffer2, 0, buffer, buffer1.Length, buffer2.Length);
|
|
|
|
duration = duration1 + duration2;
|
|
|
|
byte[] deinterleaved = DeinterleaveEccBlock(buffer, transferLength, _detectedBufferStride, _bufferFormat);
|
|
|
|
if(!CheckSectorNumber(deinterleaved, lba, transferLength, layerbreak, otp)) return true;
|
|
|
|
if(_decoding.Scramble(deinterleaved, transferLength, out byte[] scrambledBuffer) != ErrorNumber.NoError)
|
|
return true;
|
|
|
|
buffer = scrambledBuffer;
|
|
|
|
_bufferOffset = newTransferLength2;
|
|
_totalSectorsRead += transferLength; // Track successful read for capacity detection
|
|
|
|
return sense1 && sense2;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Sometimes the offset on the drive memory can get lost. This tries to find it again.
|
|
/// </summary>
|
|
/// <param name="lba">The expected LBA</param>
|
|
/// <param name="timeout">Timeout in seconds.</param>
|
|
/// <param name="layerbreak">The address in which the layerbreak occur</param>
|
|
/// <param name="otp">Set to <c>true</c> if disk is Opposite Track Path (OTP)</param>
|
|
/// <returns>The offset on the device memory, or -1 if not found</returns>
|
|
private int FindBufferOffset(uint lba, uint timeout, uint layerbreak, bool otp)
|
|
{
|
|
for(uint i = 0; i < _bufferCapacityInSectors; i++)
|
|
{
|
|
ReadBuffer3CInternal(out byte[] buffer, out _, i * _detectedBufferStride, _detectedBufferStride, timeout,
|
|
out double _, lba);
|
|
|
|
byte[] deinterleaved = DeinterleaveEccBlock(buffer, 1, _detectedBufferStride, _bufferFormat);
|
|
|
|
if(CheckSectorNumber(deinterleaved, lba, 1, layerbreak, otp)) return (int)i;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Deinterleave the ECC block based on detected format
|
|
/// </summary>
|
|
/// <param name="buffer">Data buffer</param>
|
|
/// <param name="transferLength">How many blocks in buffer</param>
|
|
/// <param name="stride">Bytes per sector in buffer</param>
|
|
/// <param name="format">Buffer format type</param>
|
|
/// <returns>The deinterleaved sectors</returns>
|
|
private byte[] DeinterleaveEccBlock(byte[] buffer, uint transferLength, uint stride, BufferFormat format)
|
|
{
|
|
return format switch
|
|
{
|
|
BufferFormat.FullEccInterleaved => DeinterleaveFullEccInterleaved(buffer, transferLength, stride),
|
|
BufferFormat.PoOnly => DeinterleavePoOnly(buffer, transferLength, stride),
|
|
BufferFormat.SectorDataOnly => buffer, // No deinterleaving needed for sector-data-only format
|
|
BufferFormat.FullEccWithPadding => DeinterleaveFullEccWithPadding(buffer, transferLength, stride),
|
|
_ => DeinterleaveFullEccInterleaved(buffer, transferLength, stride) // Default fallback
|
|
};
|
|
}
|
|
}
|
|
|