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105 lines
4.0 KiB
C#
105 lines
4.0 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 NHD r0 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 © 2011-2025 Natalia Portillo
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// ****************************************************************************/
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using System.IO;
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using System.Text;
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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.Images;
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public sealed partial class Nhdr0
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{
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#region IWritableImage Members
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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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// Even if comment is supposedly ASCII, I'm pretty sure most emulators allow Shift-JIS to be used :p
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var shiftjis = Encoding.GetEncoding("shift_jis");
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if(stream.Length < Marshal.SizeOf<Header>()) return ErrorNumber.InvalidArgument;
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var hdrB = new byte[Marshal.SizeOf<Header>()];
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stream.EnsureRead(hdrB, 0, hdrB.Length);
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_nhdhdr = Marshal.ByteArrayToStructureLittleEndian<Header>(hdrB);
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_imageInfo.MediaType = MediaType.GENERIC_HDD;
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_imageInfo.ImageSize = (ulong)(stream.Length - _nhdhdr.dwHeadSize);
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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)(_nhdhdr.dwCylinder * _nhdhdr.wHead * _nhdhdr.wSect);
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_imageInfo.MetadataMediaType = MetadataMediaType.BlockMedia;
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_imageInfo.SectorSize = (uint)_nhdhdr.wSectLen;
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_imageInfo.Cylinders = (uint)_nhdhdr.dwCylinder;
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_imageInfo.Heads = (uint)_nhdhdr.wHead;
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_imageInfo.SectorsPerTrack = (uint)_nhdhdr.wSect;
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_imageInfo.Comments = StringHandlers.CToString(_nhdhdr.szComment, shiftjis);
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_nhdImageFilter = 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) => 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) return ErrorNumber.OutOfRange;
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if(sectorAddress + length > _imageInfo.Sectors) return ErrorNumber.OutOfRange;
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buffer = new byte[length * _imageInfo.SectorSize];
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Stream stream = _nhdImageFilter.GetDataForkStream();
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stream.Seek((long)((ulong)_nhdhdr.dwHeadSize + sectorAddress * _imageInfo.SectorSize), SeekOrigin.Begin);
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stream.EnsureRead(buffer, 0, (int)(length * _imageInfo.SectorSize));
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return ErrorNumber.NoError;
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}
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#endregion
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} |