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Aaru/DiscImageChef.DiscImages/QCOW2/Write.cs

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Refactor image classes and split them to smaller files.
2018-07-23 23:25:43 +01:00
// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename : Write.cs
// Author(s) : Natalia Portillo <claunia@claunia.com>
//
// Component : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
// Writes QEMU Copy-On-Write v2 disk images.
//
// --[ License ] --------------------------------------------------------------
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
Update copyright year.
2018-12-29 17:34:38 +00:00
// Copyright © 2011-2019 Natalia Portillo
Refactor image classes and split them to smaller files.
2018-07-23 23:25:43 +01:00
// ****************************************************************************/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using DiscImageChef.CommonTypes;
using DiscImageChef.CommonTypes.Enums;
using DiscImageChef.CommonTypes.Structs;
using Schemas;
namespace DiscImageChef.DiscImages
{
public partial class Qcow2
{
public bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors,
uint sectorSize)
{
if(sectorSize != 512)
{
ErrorMessage = "Unsupported sector size";
return false;
}
if(!SupportedMediaTypes.Contains(mediaType))
{
ErrorMessage = $"Unsupport media format {mediaType}";
return false;
}
// TODO: Correct this calculation
if(sectors * sectorSize / 65536 > uint.MaxValue)
{
ErrorMessage = "Too many sectors for selected cluster size";
return false;
}
imageInfo = new ImageInfo {MediaType = mediaType, SectorSize = sectorSize, Sectors = sectors};
try { writingStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None); }
catch(IOException e)
{
ErrorMessage = $"Could not create new image file, exception {e.Message}";
return false;
}
string extension = Path.GetExtension(path);
bool version3 = extension == ".qcow3" || extension == ".qc3";
qHdr = new QCow2Header
{
magic = QCOW_MAGIC,
version = version3 ? QCOW_VERSION3 : QCOW_VERSION2,
size = sectors * sectorSize,
cluster_bits = 16,
header_length = (uint)Marshal.SizeOf(typeof(QCow2Header))
};
clusterSize = 1 << (int)qHdr.cluster_bits;
clusterSectors = 1 << ((int)qHdr.cluster_bits - 9);
l2Bits = (int)(qHdr.cluster_bits - 3);
l2Size = 1 << l2Bits;
l1Mask = 0;
int c = 0;
l1Shift = (int)(l2Bits + qHdr.cluster_bits);
for(int i = 0; i < 64; i++)
{
l1Mask <<= 1;
if(c >= 64 - l1Shift) continue;
l1Mask += 1;
c++;
}
l2Mask = 0;
for(int i = 0; i < l2Bits; i++) l2Mask = (l2Mask << 1) + 1;
l2Mask <<= (int)qHdr.cluster_bits;
sectorMask = 0;
for(int i = 0; i < qHdr.cluster_bits; i++) sectorMask = (sectorMask << 1) + 1;
qHdr.l1_size = (uint)(qHdr.size >> l1Shift);
if(qHdr.l1_size == 0) qHdr.l1_size = 1;
l1Table = new ulong[qHdr.l1_size];
ulong clusters = qHdr.size / (ulong)clusterSize;
ulong refCountBlocks = clusters * 2 / (ulong)clusterSize;
if(refCountBlocks == 0) refCountBlocks = 1;
qHdr.refcount_table_offset = (ulong)clusterSize;
qHdr.refcount_table_clusters = (uint)(refCountBlocks * 8 / (ulong)clusterSize);
if(qHdr.refcount_table_clusters == 0) qHdr.refcount_table_clusters = 1;
refCountTable = new ulong[refCountBlocks];
qHdr.l1_table_offset = qHdr.refcount_table_offset + (ulong)(qHdr.refcount_table_clusters * clusterSize);
ulong l1TableClusters =
qHdr.l1_size * 8 / (ulong)clusterSize;
if(l1TableClusters == 0) l1TableClusters = 1;
byte[] empty = new byte[qHdr.l1_table_offset + l1TableClusters * (ulong)clusterSize];
writingStream.Write(empty, 0, empty.Length);
IsWriting = true;
ErrorMessage = null;
return true;
}
public bool WriteMediaTag(byte[] data, MediaTagType tag)
{
ErrorMessage = "Writing media tags is not supported.";
return false;
}
public bool WriteSector(byte[] data, ulong sectorAddress)
{
if(!IsWriting)
{
ErrorMessage = "Tried to write on a non-writable image";
return false;
}
if(data.Length != imageInfo.SectorSize)
{
ErrorMessage = "Incorrect data size";
return false;
}
if(sectorAddress >= imageInfo.Sectors)
{
ErrorMessage = "Tried to write past image size";
return false;
}
// Ignore empty sectors
if(ArrayHelpers.ArrayIsNullOrEmpty(data)) return true;
ulong byteAddress = sectorAddress * 512;
ulong l1Off = (byteAddress & l1Mask) >> l1Shift;
if((long)l1Off >= l1Table.LongLength)
throw new ArgumentOutOfRangeException(nameof(l1Off),
$"Trying to write past L1 table, position {l1Off} of a max {l1Table.LongLength}");
if(l1Table[l1Off] == 0)
{
writingStream.Seek(0, SeekOrigin.End);
l1Table[l1Off] = (ulong)writingStream.Position;
byte[] l2TableB = new byte[l2Size * 8];
writingStream.Seek(0, SeekOrigin.End);
writingStream.Write(l2TableB, 0, l2TableB.Length);
}
writingStream.Position = (long)l1Table[l1Off];
ulong l2Off = (byteAddress & l2Mask) >> (int)qHdr.cluster_bits;
writingStream.Seek((long)(l1Table[l1Off] + l2Off * 8), SeekOrigin.Begin);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
byte[] entry = new byte[8];
writingStream.Read(entry, 0, 8);
ulong offset = BigEndianBitConverter.ToUInt64(entry, 0);
if(offset == 0)
{
offset = (ulong)writingStream.Length;
byte[] cluster = new byte[clusterSize];
entry = BigEndianBitConverter.GetBytes(offset);
writingStream.Seek((long)(l1Table[l1Off] + l2Off * 8), SeekOrigin.Begin);
writingStream.Write(entry, 0, 8);
writingStream.Seek(0, SeekOrigin.End);
writingStream.Write(cluster, 0, cluster.Length);
}
writingStream.Seek((long)(offset + (byteAddress & sectorMask)), SeekOrigin.Begin);
writingStream.Write(data, 0, data.Length);
int refCountBlockEntries = clusterSize * 8 / 16;
ulong refCountBlockIndex = offset / (ulong)clusterSize % (ulong)refCountBlockEntries;
ulong refCountTableIndex = offset / (ulong)clusterSize / (ulong)refCountBlockEntries;
ulong refBlockOffset = refCountTable[refCountTableIndex];
if(refBlockOffset == 0)
{
refBlockOffset = (ulong)writingStream.Length;
refCountTable[refCountTableIndex] = refBlockOffset;
byte[] cluster = new byte[clusterSize];
writingStream.Seek(0, SeekOrigin.End);
writingStream.Write(cluster, 0, cluster.Length);
}
writingStream.Seek((long)(refBlockOffset + refCountBlockIndex), SeekOrigin.Begin);
writingStream.Write(new byte[] {0, 1}, 0, 2);
ErrorMessage = "";
return true;
}
// TODO: This can be optimized
public bool WriteSectors(byte[] data, ulong sectorAddress, uint length)
{
if(!IsWriting)
{
ErrorMessage = "Tried to write on a non-writable image";
return false;
}
if(data.Length % imageInfo.SectorSize != 0)
{
ErrorMessage = "Incorrect data size";
return false;
}
if(sectorAddress + length > imageInfo.Sectors)
{
ErrorMessage = "Tried to write past image size";
return false;
}
// Ignore empty sectors
if(ArrayHelpers.ArrayIsNullOrEmpty(data)) return true;
for(uint i = 0; i < length; i++)
{
byte[] tmp = new byte[imageInfo.SectorSize];
Array.Copy(data, i * imageInfo.SectorSize, tmp, 0, imageInfo.SectorSize);
if(!WriteSector(tmp, sectorAddress + i)) return false;
}
ErrorMessage = "";
return true;
}
public bool WriteSectorLong(byte[] data, ulong sectorAddress)
{
ErrorMessage = "Writing sectors with tags is not supported.";
return false;
}
public bool WriteSectorsLong(byte[] data, ulong sectorAddress, uint length)
{
ErrorMessage = "Writing sectors with tags is not supported.";
return false;
}
public bool SetTracks(List<Track> tracks)
{
ErrorMessage = "Unsupported feature";
return false;
}
public bool Close()
{
if(!IsWriting)
{
ErrorMessage = "Image is not opened for writing";
return false;
}
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
writingStream.Seek(0, SeekOrigin.Begin);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.magic), 0, 4);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.version), 0, 4);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.backing_file_offset), 0, 8);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.backing_file_size), 0, 4);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.cluster_bits), 0, 4);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.size), 0, 8);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.crypt_method), 0, 4);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.l1_size), 0, 4);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.l1_table_offset), 0, 8);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.refcount_table_offset), 0, 8);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.refcount_table_clusters), 0, 4);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.nb_snapshots), 0, 4);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.snapshots_offset), 0, 8);
if(qHdr.version == QCOW_VERSION3)
{
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.features), 0, 8);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.compat_features), 0, 8);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.autoclear_features), 0, 8);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.refcount_order), 0, 4);
writingStream.Write(BigEndianBitConverter.GetBytes(qHdr.header_length), 0, 4);
}
writingStream.Seek((long)qHdr.refcount_table_offset, SeekOrigin.Begin);
for(long i = 0; i < refCountTable.LongLength; i++)
writingStream.Write(BigEndianBitConverter.GetBytes(refCountTable[i]), 0, 8);
writingStream.Seek((long)qHdr.l1_table_offset, SeekOrigin.Begin);
for(long i = 0; i < l1Table.LongLength; i++)
writingStream.Write(BigEndianBitConverter.GetBytes(l1Table[i]), 0, 8);
writingStream.Flush();
writingStream.Close();
IsWriting = false;
ErrorMessage = "";
return true;
}
public bool SetMetadata(ImageInfo metadata)
{
return true;
}
public bool SetGeometry(uint cylinders, uint heads, uint sectorsPerTrack)
{
// Not stored in image
return true;
}
public bool WriteSectorTag(byte[] data, ulong sectorAddress, SectorTagType tag)
{
ErrorMessage = "Writing sectors with tags is not supported.";
return false;
}
public bool WriteSectorsTag(byte[] data, ulong sectorAddress, uint length, SectorTagType tag)
{
ErrorMessage = "Writing sectors with tags is not supported.";
return false;
}
public bool SetDumpHardware(List<DumpHardwareType> dumpHardware)
{
// Not supported
return false;
}
public bool SetCicmMetadata(CICMMetadataType metadata)
{
// Not supported
return false;
}
}
}
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