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674 lines
23 KiB
C#
674 lines
23 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : QED.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Disc image plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Manages QEMU Enhanced Disk images.
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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 © 2011-2017 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Runtime.InteropServices;
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using DiscImageChef.CommonTypes;
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using DiscImageChef.Console;
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using DiscImageChef.Filters;
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namespace DiscImageChef.ImagePlugins
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{
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class QED : ImagePlugin
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{
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#region Internal constants
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/// <summary>
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/// Magic number: 'Q', 'E', 'D', 0x00
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/// </summary>
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const uint QedMagic = 0x00444551;
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/// <summary>
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/// Mask of unsupported incompatible features
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/// </summary>
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const ulong QedFeatureMask = 0xFFFFFFFFFFFFFFF8;
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/// <summary>
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/// File is differential (has a backing file)
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/// </summary>
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const ulong QedFeature_BackingFile = 0x01;
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/// <summary>
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/// Image needs a consistency check before writing
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/// </summary>
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const ulong QedFeature_NeedsCheck = 0x02;
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/// <summary>s
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/// Backing file is a raw disk image
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/// </summary>
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const ulong QedFeature_RawBacking = 0x04;
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const int MaxCacheSize = 16777216;
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#endregion
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#region Internal Structures
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/// <summary>
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/// QED header, big-endian
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/// </summary>
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct QedHeader
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{
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/// <summary>
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/// <see cref="QedMagic"/>
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/// </summary>
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public uint magic;
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/// <summary>
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/// Cluster size in bytes
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/// </summary>
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public uint cluster_size;
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/// <summary>
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/// L1 and L2 table size in cluster
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/// </summary>
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public uint table_size;
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/// <summary>
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/// Header size in clusters
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/// </summary>
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public uint header_size;
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/// <summary>
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/// Incompatible features
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/// </summary>
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public ulong features;
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/// <summary>
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/// Compatible features
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/// </summary>
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public ulong compat_features;
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/// <summary>
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/// Self-resetting features
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/// </summary>
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public ulong autoclear_features;
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/// <summary>
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/// Offset to L1 table
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/// </summary>
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public ulong l1_table_offset;
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/// <summary>
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/// Image size
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/// </summary>
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public ulong image_size;
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/// <summary>
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/// Offset inside file to string containing backing file
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/// </summary>
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public ulong backing_file_offset;
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/// <summary>
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/// Size of <see cref="backing_file_offset"/>
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/// </summary>
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public uint backing_file_size;
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}
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#endregion
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QedHeader qHdr;
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uint clusterSectors;
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uint tableSize;
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ulong[] l1Table;
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ulong l1Mask;
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int l1Shift;
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ulong l2Mask;
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ulong sectorMask;
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int clusterBits;
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Dictionary<ulong, byte[]> sectorCache;
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Dictionary<ulong, byte[]> clusterCache;
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Dictionary<ulong, ulong[]> l2TableCache;
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uint maxCachedSectors = MaxCacheSize / 512;
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uint maxL2TableCache;
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uint maxClusterCache;
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Stream imageStream;
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public QED()
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{
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Name = "QEMU Enhanced Disk image";
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PluginUUID = new Guid("B9DBB155-A69A-4C10-BF91-96BF431B9BB6");
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ImageInfo = new ImageInfo();
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ImageInfo.readableSectorTags = new List<SectorTagType>();
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ImageInfo.readableMediaTags = new List<MediaTagType>();
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ImageInfo.imageHasPartitions = false;
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ImageInfo.imageHasSessions = false;
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ImageInfo.imageVersion = "1";
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ImageInfo.imageApplication = "QEMU";
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ImageInfo.imageApplicationVersion = null;
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ImageInfo.imageCreator = null;
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ImageInfo.imageComments = null;
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ImageInfo.mediaManufacturer = null;
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ImageInfo.mediaModel = null;
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ImageInfo.mediaSerialNumber = null;
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ImageInfo.mediaBarcode = null;
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ImageInfo.mediaPartNumber = null;
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ImageInfo.mediaSequence = 0;
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ImageInfo.lastMediaSequence = 0;
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ImageInfo.driveManufacturer = null;
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ImageInfo.driveModel = null;
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ImageInfo.driveSerialNumber = null;
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ImageInfo.driveFirmwareRevision = null;
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}
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public override bool IdentifyImage(Filter imageFilter)
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{
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Stream stream = imageFilter.GetDataForkStream();
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stream.Seek(0, SeekOrigin.Begin);
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if(stream.Length < 512)
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return false;
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byte[] qHdr_b = new byte[64];
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stream.Read(qHdr_b, 0, 64);
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qHdr = new QedHeader();
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IntPtr headerPtr = Marshal.AllocHGlobal(64);
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Marshal.Copy(qHdr_b, 0, headerPtr, 64);
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qHdr = (QedHeader)Marshal.PtrToStructure(headerPtr, typeof(QedHeader));
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Marshal.FreeHGlobal(headerPtr);
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return qHdr.magic == QedMagic;
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}
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public override bool OpenImage(Filter imageFilter)
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{
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Stream stream = imageFilter.GetDataForkStream();
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stream.Seek(0, SeekOrigin.Begin);
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if(stream.Length < 512)
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return false;
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byte[] qHdr_b = new byte[64];
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stream.Read(qHdr_b, 0, 64);
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qHdr = new QedHeader();
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IntPtr headerPtr = Marshal.AllocHGlobal(64);
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Marshal.Copy(qHdr_b, 0, headerPtr, 64);
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qHdr = (QedHeader)Marshal.PtrToStructure(headerPtr, typeof(QedHeader));
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Marshal.FreeHGlobal(headerPtr);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.magic = 0x{0:X8}", qHdr.magic);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.cluster_size = {0}", qHdr.cluster_size);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.table_size = {0}", qHdr.table_size);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.header_size = {0}", qHdr.header_size);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.features = {0}", qHdr.features);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.compat_features = {0}", qHdr.compat_features);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.autoclear_features = {0}", qHdr.autoclear_features);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.l1_table_offset = {0}", qHdr.l1_table_offset);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.image_size = {0}", qHdr.image_size);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.backing_file_offset = {0}", qHdr.backing_file_offset);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.backing_file_size = {0}", qHdr.backing_file_size);
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if(qHdr.image_size <= 1)
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throw new ArgumentOutOfRangeException(nameof(qHdr.image_size), "Image size is too small");
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if(!IsPowerOfTwo(qHdr.cluster_size))
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throw new ArgumentOutOfRangeException(nameof(qHdr.cluster_size), "Cluster size must be a power of 2");
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if(qHdr.cluster_size < 4096 || qHdr.cluster_size > 67108864)
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throw new ArgumentOutOfRangeException(nameof(qHdr.cluster_size), "Cluster size must be between 4 Kbytes and 64 Mbytes");
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if(!IsPowerOfTwo(qHdr.table_size))
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throw new ArgumentOutOfRangeException(nameof(qHdr.table_size), "Table size must be a power of 2");
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if(qHdr.table_size < 1 || qHdr.table_size > 16)
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throw new ArgumentOutOfRangeException(nameof(qHdr.table_size), "Table size must be between 1 and 16 clusters");
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if((qHdr.features & QedFeatureMask) > 0)
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throw new ArgumentOutOfRangeException(nameof(qHdr.features), string.Format("Image uses unknown incompatible features {0:X}", qHdr.features & QedFeatureMask));
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if((qHdr.features & QedFeature_BackingFile) == QedFeature_BackingFile)
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throw new NotImplementedException("Differencing images not yet supported");
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clusterSectors = qHdr.cluster_size / 512;
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tableSize = (qHdr.cluster_size * qHdr.table_size) / 8;
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DicConsole.DebugWriteLine("QED plugin", "qHdr.clusterSectors = {0}", clusterSectors);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.tableSize = {0}", tableSize);
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byte[] l1Table_b = new byte[tableSize * 8];
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stream.Seek((long)qHdr.l1_table_offset, SeekOrigin.Begin);
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stream.Read(l1Table_b, 0, (int)tableSize * 8);
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l1Table = new ulong[tableSize];
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DicConsole.DebugWriteLine("QED plugin", "Reading L1 table");
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for(long i = 0; i < l1Table.LongLength; i++)
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l1Table[i] = BitConverter.ToUInt64(l1Table_b, (int)(i * 8));
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l1Mask = 0;
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int c = 0;
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clusterBits = ctz32(qHdr.cluster_size);
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l2Mask = (tableSize - 1) << clusterBits;
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l1Shift = clusterBits + ctz32(tableSize);
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for(int i = 0; i < 64; i++)
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{
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l1Mask <<= 1;
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if(c < 64 - l1Shift)
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{
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l1Mask += 1;
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c++;
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}
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}
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sectorMask = 0;
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for(int i = 0; i < clusterBits; i++)
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sectorMask = (sectorMask << 1) + 1;
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DicConsole.DebugWriteLine("QED plugin", "qHdr.clusterBits = {0}", clusterBits);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.l1Mask = {0:X}", l1Mask);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.l1Shift = {0}", l1Shift);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.l2Mask = {0:X}", l2Mask);
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DicConsole.DebugWriteLine("QED plugin", "qHdr.sectorMask = {0:X}", sectorMask);
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maxL2TableCache = MaxCacheSize / (tableSize);
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maxClusterCache = MaxCacheSize / qHdr.cluster_size;
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imageStream = stream;
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sectorCache = new Dictionary<ulong, byte[]>();
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l2TableCache = new Dictionary<ulong, ulong[]>();
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clusterCache = new Dictionary<ulong, byte[]>();
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ImageInfo.imageCreationTime = imageFilter.GetCreationTime();
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ImageInfo.imageLastModificationTime = imageFilter.GetLastWriteTime();
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ImageInfo.imageName = Path.GetFileNameWithoutExtension(imageFilter.GetFilename());
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ImageInfo.sectors = qHdr.image_size / 512;
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ImageInfo.sectorSize = 512;
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ImageInfo.xmlMediaType = XmlMediaType.BlockMedia;
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ImageInfo.mediaType = MediaType.GENERIC_HDD;
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ImageInfo.imageSize = qHdr.image_size;
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return true;
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}
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public override byte[] ReadSector(ulong sectorAddress)
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{
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if(sectorAddress > ImageInfo.sectors - 1)
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throw new ArgumentOutOfRangeException(nameof(sectorAddress), string.Format("Sector address {0} not found", sectorAddress));
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byte[] sector;
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// Check cache
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if(sectorCache.TryGetValue(sectorAddress, out sector))
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return sector;
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ulong byteAddress = sectorAddress * 512;
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ulong l1Off = (byteAddress & l1Mask) >> l1Shift;
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if((long)l1Off >= l1Table.LongLength)
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throw new ArgumentOutOfRangeException(nameof(l1Off), string.Format("Trying to read past L1 table, position {0} of a max {1}", l1Off, l1Table.LongLength));
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// TODO: Implement differential images
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if(l1Table[l1Off] == 0)
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return new byte[512];
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ulong[] l2Table;
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if(!l2TableCache.TryGetValue(l1Off, out l2Table))
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{
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l2Table = new ulong[tableSize];
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imageStream.Seek((long)l1Table[l1Off], SeekOrigin.Begin);
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byte[] l2Table_b = new byte[tableSize * 8];
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imageStream.Read(l2Table_b, 0, (int)tableSize * 8);
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DicConsole.DebugWriteLine("QED plugin", "Reading L2 table #{0}", l1Off);
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for(long i = 0; i < l2Table.LongLength; i++)
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l2Table[i] = BitConverter.ToUInt64(l2Table_b, (int)(i * 8));
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if(l2TableCache.Count >= maxL2TableCache)
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l2TableCache.Clear();
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l2TableCache.Add(l1Off, l2Table);
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}
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ulong l2Off = (byteAddress & l2Mask) >> clusterBits;
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ulong offset = l2Table[l2Off];
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sector = new byte[512];
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if(offset != 0 && offset != 1)
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{
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byte[] cluster;
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if(!clusterCache.TryGetValue(offset, out cluster))
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{
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cluster = new byte[qHdr.cluster_size];
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imageStream.Seek((long)offset, SeekOrigin.Begin);
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imageStream.Read(cluster, 0, (int)qHdr.cluster_size);
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if(clusterCache.Count >= maxClusterCache)
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clusterCache.Clear();
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clusterCache.Add(offset, cluster);
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}
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Array.Copy(cluster, (int)(byteAddress & sectorMask), sector, 0, 512);
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}
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if(sectorCache.Count >= maxCachedSectors)
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sectorCache.Clear();
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sectorCache.Add(sectorAddress, sector);
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return sector;
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}
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public override byte[] ReadSectors(ulong sectorAddress, uint length)
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{
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if(sectorAddress > ImageInfo.sectors - 1)
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throw new ArgumentOutOfRangeException(nameof(sectorAddress), string.Format("Sector address {0} not found", sectorAddress));
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if(sectorAddress + length > ImageInfo.sectors)
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throw new ArgumentOutOfRangeException(nameof(length), "Requested more sectors than available");
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MemoryStream ms = new MemoryStream();
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for(uint i = 0; i < length; i++)
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{
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byte[] sector = ReadSector(sectorAddress + i);
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ms.Write(sector, 0, sector.Length);
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}
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return ms.ToArray();
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}
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public override bool ImageHasPartitions()
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{
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return false;
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}
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public override ulong GetImageSize()
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{
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return ImageInfo.imageSize;
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}
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public override ulong GetSectors()
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{
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return ImageInfo.sectors;
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}
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public override uint GetSectorSize()
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{
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return ImageInfo.sectorSize;
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}
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public override string GetImageFormat()
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{
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return "QEMU Enhanced Disk";
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}
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public override string GetImageVersion()
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{
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return ImageInfo.imageVersion;
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}
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public override string GetImageApplication()
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{
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return ImageInfo.imageApplication;
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}
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public override string GetImageApplicationVersion()
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{
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return ImageInfo.imageApplicationVersion;
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}
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public override string GetImageCreator()
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{
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return ImageInfo.imageCreator;
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}
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public override DateTime GetImageCreationTime()
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{
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return ImageInfo.imageCreationTime;
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}
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public override DateTime GetImageLastModificationTime()
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{
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return ImageInfo.imageLastModificationTime;
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}
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public override string GetImageName()
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{
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return ImageInfo.imageName;
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}
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public override string GetImageComments()
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{
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return ImageInfo.imageComments;
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}
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public override MediaType GetMediaType()
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{
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return ImageInfo.mediaType;
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}
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bool IsPowerOfTwo(uint x)
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{
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while(((x & 1) == 0) && x > 1)
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x >>= 1;
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return (x == 1);
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}
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static int ctz32(uint val)
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{
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int cnt = 0;
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if((val & 0xFFFF) == 0)
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{
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cnt += 16;
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val >>= 16;
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}
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if((val & 0xFF) == 0)
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{
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cnt += 8;
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val >>= 8;
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}
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if((val & 0xF) == 0)
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{
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cnt += 4;
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val >>= 4;
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}
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if((val & 0x3) == 0)
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{
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cnt += 2;
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val >>= 2;
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}
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if((val & 0x1) == 0)
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{
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cnt++;
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val >>= 1;
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}
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if((val & 0x1) == 0)
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{
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cnt++;
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}
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return cnt;
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}
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#region Unsupported features
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public override byte[] ReadSectorTag(ulong sectorAddress, SectorTagType tag)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public override byte[] ReadSectorsTag(ulong sectorAddress, uint length, SectorTagType tag)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
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public override byte[] ReadDiskTag(MediaTagType tag)
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{
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throw new FeatureUnsupportedImageException("Feature not supported by image format");
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}
|
|
|
|
public override byte[] ReadSector(ulong sectorAddress, uint track)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override byte[] ReadSectorTag(ulong sectorAddress, uint track, SectorTagType tag)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override byte[] ReadSectors(ulong sectorAddress, uint length, uint track)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override byte[] ReadSectorsTag(ulong sectorAddress, uint length, uint track, SectorTagType tag)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override byte[] ReadSectorLong(ulong sectorAddress)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override byte[] ReadSectorLong(ulong sectorAddress, uint track)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override byte[] ReadSectorsLong(ulong sectorAddress, uint length)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override byte[] ReadSectorsLong(ulong sectorAddress, uint length, uint track)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override string GetMediaManufacturer()
|
|
{
|
|
return null;
|
|
}
|
|
|
|
public override string GetMediaModel()
|
|
{
|
|
return null;
|
|
}
|
|
|
|
public override string GetMediaSerialNumber()
|
|
{
|
|
return null;
|
|
}
|
|
|
|
public override string GetMediaBarcode()
|
|
{
|
|
return null;
|
|
}
|
|
|
|
public override string GetMediaPartNumber()
|
|
{
|
|
return null;
|
|
}
|
|
|
|
public override int GetMediaSequence()
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
public override int GetLastDiskSequence()
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
public override string GetDriveManufacturer()
|
|
{
|
|
return null;
|
|
}
|
|
|
|
public override string GetDriveModel()
|
|
{
|
|
return null;
|
|
}
|
|
|
|
public override string GetDriveSerialNumber()
|
|
{
|
|
return null;
|
|
}
|
|
|
|
public override List<Partition> GetPartitions()
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override List<Track> GetTracks()
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override List<Track> GetSessionTracks(Session session)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override List<Track> GetSessionTracks(ushort session)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override List<Session> GetSessions()
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override bool? VerifySector(ulong sectorAddress)
|
|
{
|
|
return null;
|
|
}
|
|
|
|
public override bool? VerifySector(ulong sectorAddress, uint track)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override bool? VerifySectors(ulong sectorAddress, uint length, out List<ulong> FailingLBAs, out List<ulong> UnknownLBAs)
|
|
{
|
|
FailingLBAs = new List<ulong>();
|
|
UnknownLBAs = new List<ulong>();
|
|
for(ulong i = 0; i < ImageInfo.sectors; i++)
|
|
UnknownLBAs.Add(i);
|
|
return null;
|
|
}
|
|
|
|
public override bool? VerifySectors(ulong sectorAddress, uint length, uint track, out List<ulong> FailingLBAs, out List<ulong> UnknownLBAs)
|
|
{
|
|
throw new FeatureUnsupportedImageException("Feature not supported by image format");
|
|
}
|
|
|
|
public override bool? VerifyMediaImage()
|
|
{
|
|
return null;
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|
|
|