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105 lines
3.9 KiB
C#
105 lines
3.9 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Read.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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// Reads T98 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.IO;
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using Aaru.CommonTypes;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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namespace Aaru.DiscImages
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{
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public sealed partial class T98
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{
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/// <inheritdoc />
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public ErrorNumber Open(IFilter 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 % 256 != 0)
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return ErrorNumber.InvalidArgument;
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byte[] hdrB = new byte[256];
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stream.Read(hdrB, 0, hdrB.Length);
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for(int i = 4; i < 256; i++)
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if(hdrB[i] != 0)
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return ErrorNumber.InvalidArgument;
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int cylinders = BitConverter.ToInt32(hdrB, 0);
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_imageInfo.MediaType = MediaType.GENERIC_HDD;
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_imageInfo.ImageSize = (ulong)(stream.Length - 256);
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_imageInfo.CreationTime = imageFilter.CreationTime;
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_imageInfo.LastModificationTime = imageFilter.LastWriteTime;
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_imageInfo.MediaTitle = Path.GetFileNameWithoutExtension(imageFilter.Filename);
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_imageInfo.Sectors = (ulong)((stream.Length / 256) - 1);
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_imageInfo.XmlMediaType = XmlMediaType.BlockMedia;
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_imageInfo.SectorSize = 256;
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_imageInfo.Cylinders = (uint)cylinders;
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_imageInfo.Heads = 8;
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_imageInfo.SectorsPerTrack = 33;
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_t98ImageFilter = imageFilter;
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber ReadSector(ulong sectorAddress, out byte[] buffer) =>
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ReadSectors(sectorAddress, 1, out buffer);
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/// <inheritdoc />
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public ErrorNumber ReadSectors(ulong sectorAddress, uint length, out byte[] buffer)
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{
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buffer = null;
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if(sectorAddress > _imageInfo.Sectors - 1)
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return ErrorNumber.OutOfRange;
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if(sectorAddress + length > _imageInfo.Sectors)
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return ErrorNumber.OutOfRange;
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buffer = new byte[length * _imageInfo.SectorSize];
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Stream stream = _t98ImageFilter.GetDataForkStream();
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stream.Seek((long)(256 + (sectorAddress * _imageInfo.SectorSize)), SeekOrigin.Begin);
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stream.Read(buffer, 0, (int)(length * _imageInfo.SectorSize));
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return ErrorNumber.NoError;
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}
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}
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} |