mirror of
https://github.com/aaru-dps/Aaru.git
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339 lines
10 KiB
C#
339 lines
10 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Write.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Disk image plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Writes 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 © 2011-2021 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.Linq;
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using System.Runtime.InteropServices;
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using Aaru.CommonTypes;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Structs;
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using Aaru.Helpers;
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using Schemas;
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using Marshal = Aaru.Helpers.Marshal;
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namespace Aaru.DiscImages
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{
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public sealed partial class Qed
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{
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/// <inheritdoc />
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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 = $"Unsupported 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 / DEFAULT_CLUSTER_SIZE > 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
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{
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MediaType = mediaType,
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SectorSize = sectorSize,
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Sectors = sectors
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};
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try
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{
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_writingStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
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}
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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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_qHdr = new QedHeader
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{
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magic = QED_MAGIC,
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cluster_size = DEFAULT_CLUSTER_SIZE,
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table_size = DEFAULT_TABLE_SIZE,
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header_size = 1,
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l1_table_offset = DEFAULT_CLUSTER_SIZE,
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image_size = sectors * sectorSize
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};
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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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_l1Table = new ulong[_tableSize];
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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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continue;
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_l1Mask += 1;
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c++;
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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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byte[] empty = new byte[_qHdr.l1_table_offset + (_tableSize * 8)];
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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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/// <inheritdoc />
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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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/// <inheritdoc />
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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))
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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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{
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ErrorMessage = $"Trying to write past L1 table, position {l1Off} of a max {_l1Table.LongLength}";
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return false;
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}
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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[_tableSize * 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) >> _clusterBits;
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_writingStream.Seek((long)(_l1Table[l1Off] + (l2Off * 8)), SeekOrigin.Begin);
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byte[] entry = new byte[8];
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_writingStream.Read(entry, 0, 8);
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ulong offset = BitConverter.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[_qHdr.cluster_size];
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entry = BitConverter.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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ErrorMessage = "";
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return true;
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}
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// TODO: This can be optimized
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/// <inheritdoc />
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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))
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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))
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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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/// <inheritdoc />
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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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/// <inheritdoc />
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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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/// <inheritdoc />
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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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byte[] hdr = new byte[Marshal.SizeOf<QedHeader>()];
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MemoryMarshal.Write(hdr, ref _qHdr);
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_writingStream.Seek(0, SeekOrigin.Begin);
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_writingStream.Write(hdr, 0, hdr.Length);
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_writingStream.Seek((long)_qHdr.l1_table_offset, SeekOrigin.Begin);
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byte[] l1TableB = MemoryMarshal.Cast<ulong, byte>(_l1Table).ToArray();
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_writingStream.Write(l1TableB, 0, l1TableB.Length);
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_writingStream.Flush();
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_writingStream.Close();
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IsWriting = false;
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ErrorMessage = "";
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return true;
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}
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/// <inheritdoc />
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public bool SetMetadata(ImageInfo metadata) => true;
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/// <inheritdoc />
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public bool SetGeometry(uint cylinders, uint heads, uint sectorsPerTrack) => true;
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/// <inheritdoc />
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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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/// <inheritdoc />
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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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/// <inheritdoc />
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public bool SetDumpHardware(List<DumpHardwareType> dumpHardware) => false;
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/// <inheritdoc />
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public bool SetCicmMetadata(CICMMetadataType metadata) => false;
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}
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} |