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126 lines
4.9 KiB
C#
126 lines
4.9 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 MaxiDisk 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.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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using Aaru.Helpers;
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namespace Aaru.DiscImages
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{
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public sealed partial class MaxiDisk
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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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if(stream.Length < 8)
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return ErrorNumber.InvalidArgument;
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byte[] buffer = new byte[8];
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stream.Seek(0, SeekOrigin.Begin);
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stream.Read(buffer, 0, buffer.Length);
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Header tmpHeader = Marshal.ByteArrayToStructureLittleEndian<Header>(buffer);
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// This is hardcoded
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// But its possible values are unknown...
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//if(tmp_header.diskType > 11)
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// return false;
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// Only floppies supported
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if(tmpHeader.heads == 0 ||
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tmpHeader.heads > 2)
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return ErrorNumber.InvalidArgument;
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// No floppies with more than this?
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if(tmpHeader.cylinders > 90)
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return ErrorNumber.InvalidArgument;
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// Maximum supported bps is 16384
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if(tmpHeader.bytesPerSector > 7)
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return ErrorNumber.InvalidArgument;
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int expectedFileSize = (tmpHeader.heads * tmpHeader.cylinders * tmpHeader.sectorsPerTrack *
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(128 << tmpHeader.bytesPerSector)) + 8;
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if(expectedFileSize != stream.Length)
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return ErrorNumber.InvalidArgument;
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_imageInfo.Cylinders = tmpHeader.cylinders;
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_imageInfo.Heads = tmpHeader.heads;
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_imageInfo.SectorsPerTrack = tmpHeader.sectorsPerTrack;
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_imageInfo.Sectors = (ulong)(tmpHeader.heads * tmpHeader.cylinders * tmpHeader.sectorsPerTrack);
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_imageInfo.SectorSize = (uint)(128 << tmpHeader.bytesPerSector);
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_hdkImageFilter = imageFilter;
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_imageInfo.ImageSize = (ulong)(stream.Length - 8);
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_imageInfo.CreationTime = imageFilter.CreationTime;
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_imageInfo.LastModificationTime = imageFilter.LastWriteTime;
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_imageInfo.MediaType = Geometry.GetMediaType(((ushort)_imageInfo.Cylinders, (byte)_imageInfo.Heads,
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(ushort)_imageInfo.SectorsPerTrack, _imageInfo.SectorSize,
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MediaEncoding.MFM, false));
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_imageInfo.XmlMediaType = XmlMediaType.BlockMedia;
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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 = _hdkImageFilter.GetDataForkStream();
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stream.Seek((long)(8 + (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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} |