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https://github.com/aaru-dps/Aaru.Server.git
synced 2025-12-16 19:24:27 +00:00
Add writing support to QEMU Copy-On-Write v2 disk image.
This commit is contained in:
@@ -33,6 +33,7 @@
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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.Linq;
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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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@@ -42,7 +43,7 @@ using SharpCompress.Compressors.Deflate;
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namespace DiscImageChef.DiscImages
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{
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public class Qcow2 : IMediaImage
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public class Qcow2 : IWritableImage
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{
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/// <summary>
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/// Magic number: 'Q', 'F', 'I', 0xFB
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@@ -89,9 +90,11 @@ namespace DiscImageChef.DiscImages
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int maxL2TableCache;
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QCow2Header qHdr;
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ulong[] refCountTable;
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Dictionary<ulong, byte[]> sectorCache;
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ulong sectorMask;
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FileStream writingStream;
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public Qcow2()
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{
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@@ -207,11 +210,6 @@ namespace DiscImageChef.DiscImages
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if(qHdr.backing_file_offset != 0)
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throw new NotImplementedException("Differencing images not yet supported");
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int shift = (int)(qHdr.cluster_bits + l2Bits);
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if(qHdr.size > ulong.MaxValue - (ulong)(1 << shift))
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throw new ArgumentOutOfRangeException(nameof(qHdr.size), "Image is too large");
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clusterSize = 1 << (int)qHdr.cluster_bits;
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clusterSectors = 1 << ((int)qHdr.cluster_bits - 9);
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l2Bits = (int)(qHdr.cluster_bits - 3);
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@@ -496,6 +494,326 @@ namespace DiscImageChef.DiscImages
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return null;
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}
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public IEnumerable<MediaTagType> SupportedMediaTags => new MediaTagType[] { };
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public IEnumerable<SectorTagType> SupportedSectorTags => new SectorTagType[] { };
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public IEnumerable<MediaType> SupportedMediaTypes =>
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new[] {MediaType.Unknown, MediaType.GENERIC_HDD};
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public IEnumerable<(string name, Type type, string description)> SupportedOptions =>
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new (string name, Type type, string description)[] { };
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public IEnumerable<string> KnownExtensions => new[] {".qcow2", ".qc2", ".qcow3", ".qc3"};
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public bool IsWriting { get; private set; }
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public string ErrorMessage { get; private set; }
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public bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors,
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uint sectorSize)
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{
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if(sectorSize != 512)
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{
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ErrorMessage = "Unsupported sector size";
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return false;
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}
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if(!SupportedMediaTypes.Contains(mediaType))
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{
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ErrorMessage = $"Unsupport media format {mediaType}";
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return false;
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}
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// TODO: Correct this calculation
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if(sectors * sectorSize / 65536 > uint.MaxValue)
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{
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ErrorMessage = "Too many sectors for selected cluster size";
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return false;
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}
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imageInfo = new ImageInfo {MediaType = mediaType, SectorSize = sectorSize, Sectors = sectors};
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try { writingStream = new FileStream(path, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.None); }
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catch(IOException e)
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{
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ErrorMessage = $"Could not create new image file, exception {e.Message}";
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return false;
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}
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string extension = Path.GetExtension(path);
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bool version3 = extension == ".qcow3" || extension == ".qc3";
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qHdr = new QCow2Header
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{
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magic = QCOW_MAGIC,
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version = version3 ? QCOW_VERSION3 : QCOW_VERSION2,
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size = sectors * sectorSize,
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cluster_bits = 16,
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header_length = (uint)Marshal.SizeOf(typeof(QCow2Header))
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};
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clusterSize = 1 << (int)qHdr.cluster_bits;
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clusterSectors = 1 << ((int)qHdr.cluster_bits - 9);
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l2Bits = (int)(qHdr.cluster_bits - 3);
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l2Size = 1 << l2Bits;
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l1Mask = 0;
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int c = 0;
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l1Shift = (int)(l2Bits + qHdr.cluster_bits);
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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) continue;
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l1Mask += 1;
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c++;
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}
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l2Mask = 0;
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for(int i = 0; i < l2Bits; i++) l2Mask = (l2Mask << 1) + 1;
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l2Mask <<= (int)qHdr.cluster_bits;
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sectorMask = 0;
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for(int i = 0; i < qHdr.cluster_bits; i++) sectorMask = (sectorMask << 1) + 1;
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qHdr.l1_size = (uint)(qHdr.size >> l1Shift);
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if(qHdr.l1_size == 0) qHdr.l1_size = 1;
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l1Table = new ulong[qHdr.l1_size];
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ulong clusters = qHdr.size / (ulong)clusterSize;
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ulong refCountBlocks = clusters * 2 / (ulong)clusterSize;
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if(refCountBlocks == 0) refCountBlocks = 1;
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qHdr.refcount_table_offset = (ulong)clusterSize;
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qHdr.refcount_table_clusters =
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(uint)(refCountBlocks * 8 / (ulong)clusterSize);
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if(qHdr.refcount_table_clusters == 0) qHdr.refcount_table_clusters = 1;
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refCountTable = new ulong[refCountBlocks];
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qHdr.l1_table_offset =
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qHdr.refcount_table_offset + (ulong)(qHdr.refcount_table_clusters * clusterSize);
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ulong l1TableClusters =
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qHdr.l1_size * 8 / (ulong)clusterSize;
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if(l1TableClusters == 0) l1TableClusters = 1;
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byte[] empty = new byte[qHdr.l1_table_offset + l1TableClusters * (ulong)clusterSize];
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writingStream.Write(empty, 0, empty.Length);
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IsWriting = true;
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ErrorMessage = null;
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return true;
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}
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public bool WriteMediaTag(byte[] data, MediaTagType tag)
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{
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ErrorMessage = "Writing media tags is not supported.";
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return false;
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}
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public bool WriteSector(byte[] data, ulong sectorAddress)
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{
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if(!IsWriting)
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{
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ErrorMessage = "Tried to write on a non-writable image";
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return false;
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}
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if(data.Length != imageInfo.SectorSize)
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{
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ErrorMessage = "Incorrect data size";
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return false;
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}
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if(sectorAddress >= imageInfo.Sectors)
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{
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ErrorMessage = "Tried to write past image size";
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return false;
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}
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// Ignore empty sectors
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if(ArrayHelpers.ArrayIsNullOrEmpty(data)) return true;
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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),
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$"Trying to write past L1 table, position {l1Off} of a max {l1Table.LongLength}");
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if(l1Table[l1Off] == 0)
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{
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writingStream.Seek(0, SeekOrigin.End);
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l1Table[l1Off] = (ulong)writingStream.Position;
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byte[] l2TableB = new byte[l2Size * 8];
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writingStream.Seek(0, SeekOrigin.End);
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writingStream.Write(l2TableB, 0, l2TableB.Length);
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}
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writingStream.Position = (long)l1Table[l1Off];
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ulong l2Off = (byteAddress & l2Mask) >> (int)qHdr.cluster_bits;
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writingStream.Seek((long)(l1Table[l1Off] + l2Off * 8), SeekOrigin.Begin);
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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byte[] entry = new byte[8];
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writingStream.Read(entry, 0, 8);
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ulong offset = BigEndianBitConverter.ToUInt64(entry, 0);
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if(offset == 0)
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{
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offset = (ulong)writingStream.Length;
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byte[] cluster = new byte[clusterSize];
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entry = BigEndianBitConverter.GetBytes(offset);
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writingStream.Seek((long)(l1Table[l1Off] + l2Off * 8), SeekOrigin.Begin);
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writingStream.Write(entry, 0, 8);
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writingStream.Seek(0, SeekOrigin.End);
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writingStream.Write(cluster, 0, cluster.Length);
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}
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writingStream.Seek((long)(offset + (byteAddress & sectorMask)), SeekOrigin.Begin);
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writingStream.Write(data, 0, data.Length);
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int refCountBlockEntries = clusterSize * 8 / 16;
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ulong refCountBlockIndex = offset / (ulong)clusterSize % (ulong)refCountBlockEntries;
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ulong refCountTableIndex = offset / (ulong)clusterSize / (ulong)refCountBlockEntries;
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ulong refBlockOffset = refCountTable[refCountTableIndex];
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if(refBlockOffset == 0)
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{
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refBlockOffset = (ulong)writingStream.Length;
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refCountTable[refCountTableIndex] = refBlockOffset;
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byte[] cluster = new byte[clusterSize];
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writingStream.Seek(0, SeekOrigin.End);
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writingStream.Write(cluster, 0, cluster.Length);
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}
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writingStream.Seek((long)(refBlockOffset + refCountBlockIndex), SeekOrigin.Begin);
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writingStream.Write(new byte[] {0, 1}, 0, 2);
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ErrorMessage = "";
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return true;
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}
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// TODO: This can be optimized
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public bool WriteSectors(byte[] data, ulong sectorAddress, uint length)
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{
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if(!IsWriting)
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{
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ErrorMessage = "Tried to write on a non-writable image";
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return false;
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}
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if(data.Length % imageInfo.SectorSize != 0)
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{
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ErrorMessage = "Incorrect data size";
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return false;
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}
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if(sectorAddress + length > imageInfo.Sectors)
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{
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ErrorMessage = "Tried to write past image size";
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return false;
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}
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// Ignore empty sectors
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if(ArrayHelpers.ArrayIsNullOrEmpty(data)) return true;
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for(uint i = 0; i < length; i++)
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{
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byte[] tmp = new byte[imageInfo.SectorSize];
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Array.Copy(data, i * imageInfo.SectorSize, tmp, 0, imageInfo.SectorSize);
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if(!WriteSector(tmp, sectorAddress + i)) return false;
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}
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ErrorMessage = "";
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return true;
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}
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public bool WriteSectorLong(byte[] data, ulong sectorAddress)
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{
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ErrorMessage = "Writing sectors with tags is not supported.";
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return false;
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}
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public bool WriteSectorsLong(byte[] data, ulong sectorAddress, uint length)
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{
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ErrorMessage = "Writing sectors with tags is not supported.";
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return false;
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}
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public bool SetTracks(List<Track> tracks)
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{
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ErrorMessage = "Unsupported feature";
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return false;
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}
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public bool Close()
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{
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if(!IsWriting)
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{
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ErrorMessage = "Image is not opened for writing";
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return false;
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}
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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writingStream.Seek(0, SeekOrigin.Begin);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.magic), 0, 4);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.version), 0, 4);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.backing_file_offset), 0, 8);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.backing_file_size), 0, 4);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.cluster_bits), 0, 4);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.size), 0, 8);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.crypt_method), 0, 4);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.l1_size), 0, 4);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.l1_table_offset), 0, 8);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.refcount_table_offset), 0, 8);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.refcount_table_clusters), 0, 4);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.nb_snapshots), 0, 4);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.snapshots_offset), 0, 8);
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if(qHdr.version == QCOW_VERSION3)
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{
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.features), 0, 8);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.compat_features), 0, 8);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.autoclear_features), 0, 8);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.refcount_order), 0, 4);
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writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.header_length), 0, 4);
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}
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writingStream.Seek((long)qHdr.refcount_table_offset, SeekOrigin.Begin);
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for(long i = 0; i < refCountTable.LongLength; i++)
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writingStream.Write(BigEndianBitConverter.GetBytes(refCountTable[i]), 0, 8);
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writingStream.Seek((long)qHdr.l1_table_offset, SeekOrigin.Begin);
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for(long i = 0; i < l1Table.LongLength; i++)
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writingStream.Write(BigEndianBitConverter.GetBytes(l1Table[i]), 0, 8);
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return true;
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}
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public bool SetMetadata(ImageInfo metadata)
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{
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return true;
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}
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public bool SetGeometry(uint cylinders, uint heads, uint sectorsPerTrack)
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{
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// Not stored in image
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return true;
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}
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public bool WriteSectorTag(byte[] data, ulong sectorAddress, SectorTagType tag)
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{
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ErrorMessage = "Writing sectors with tags is not supported.";
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return false;
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}
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public bool WriteSectorsTag(byte[] data, ulong sectorAddress, uint length, SectorTagType tag)
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{
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ErrorMessage = "Writing sectors with tags is not supported.";
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return false;
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}
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/// <summary>
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/// QCOW header, big-endian
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/// </summary>
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Reference in New Issue
Block a user