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https://github.com/aaru-dps/Aaru.git
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270 lines
9.2 KiB
C#
270 lines
9.2 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 DIM 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.Diagnostics.CodeAnalysis;
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using System.IO;
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using System.Linq;
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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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using Aaru.Logging;
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namespace Aaru.Images;
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[SuppressMessage("ReSharper", "UnusedType.Global")]
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public sealed partial class Dim
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{
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#region IMediaImage 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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if(stream.Length < DATA_OFFSET) return ErrorNumber.InvalidArgument;
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long diskSize = stream.Length - DATA_OFFSET;
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_comment = new byte[60];
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_hdrId = new byte[13];
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stream.Seek(0, SeekOrigin.Begin);
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_dskType = (DiskType)stream.ReadByte();
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stream.Seek(0xAB, SeekOrigin.Begin);
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stream.EnsureRead(_hdrId, 0, 13);
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stream.Seek(0xC2, SeekOrigin.Begin);
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stream.EnsureRead(_comment, 0, 60);
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if(!_headerId.SequenceEqual(_hdrId)) return ErrorNumber.InvalidArgument;
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_imageInfo.MediaType = MediaType.Unknown;
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switch(_dskType)
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{
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// 8 spt, 1024 bps
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case DiskType.Hd2:
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if(diskSize % (2 * 8 * 1024) != 0)
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{
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AaruLogging.Error(Localization.DIM_shows_unknown_image_with_0_tracks, diskSize / (2 * 8 * 1024));
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return ErrorNumber.NotSupported;
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}
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if(diskSize / (2 * 8 * 1024) == 77) _imageInfo.MediaType = MediaType.SHARP_525;
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_imageInfo.SectorSize = 1024;
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break;
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// 9 spt, 1024 bps
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case DiskType.Hs2:
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if(diskSize % (2 * 9 * 512) != 0)
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{
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AaruLogging.Error(Localization.DIM_shows_unknown_image_with_0_tracks, diskSize / (2 * 9 * 512));
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return ErrorNumber.NotSupported;
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}
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if(diskSize / (2 * 9 * 512) == 80) _imageInfo.MediaType = MediaType.SHARP_525_9;
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_imageInfo.SectorSize = 512;
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break;
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// 15 spt, 512 bps
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case DiskType.Hc2:
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if(diskSize % (2 * 15 * 512) != 0)
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{
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AaruLogging.Error(Localization.DIM_shows_unknown_image_with_0_tracks, diskSize / (2 * 15 * 512));
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return ErrorNumber.NotSupported;
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}
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if(diskSize / (2 * 15 * 512) == 80) _imageInfo.MediaType = MediaType.DOS_525_HD;
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_imageInfo.SectorSize = 512;
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break;
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// 9 spt, 1024 bps
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case DiskType.Hde2:
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if(diskSize % (2 * 9 * 512) != 0)
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{
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AaruLogging.Error(Localization.DIM_shows_unknown_image_with_0_tracks, diskSize / (2 * 9 * 512));
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return ErrorNumber.NotSupported;
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}
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if(diskSize / (2 * 9 * 512) == 80) _imageInfo.MediaType = MediaType.SHARP_35_9;
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_imageInfo.SectorSize = 512;
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break;
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// 18 spt, 512 bps
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case DiskType.Hq2:
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if(diskSize % (2 * 18 * 512) != 0)
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{
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AaruLogging.Error(Localization.DIM_shows_unknown_image_with_0_tracks, diskSize / (2 * 18 * 512));
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return ErrorNumber.NotSupported;
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}
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if(diskSize / (2 * 18 * 512) == 80) _imageInfo.MediaType = MediaType.DOS_35_HD;
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_imageInfo.SectorSize = 512;
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break;
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// 26 spt, 256 bps
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case DiskType.N88:
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if(diskSize % (2 * 26 * 256) == 0)
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{
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if(diskSize % (2 * 26 * 256) == 77) _imageInfo.MediaType = MediaType.NEC_8_DD;
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_imageInfo.SectorSize = 256;
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}
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else if(diskSize % (2 * 26 * 128) == 0)
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{
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if(diskSize % (2 * 26 * 128) == 77) _imageInfo.MediaType = MediaType.NEC_8_SD;
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_imageInfo.SectorSize = 256;
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}
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else
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{
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AaruLogging.Error(Localization.DIM_shows_unknown_image_with_0_tracks, diskSize / (2 * 26 * 256));
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return ErrorNumber.NotSupported;
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}
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break;
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default:
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return ErrorNumber.InvalidArgument;
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}
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AaruLogging.Verbose(Localization.DIM_image_contains_a_disk_of_type_0, _imageInfo.MediaType);
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if(!string.IsNullOrEmpty(_imageInfo.Comments))
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AaruLogging.Verbose(Localization.DIM_comments_0, _imageInfo.Comments);
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_dimImageFilter = imageFilter;
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_imageInfo.ImageSize = (ulong)diskSize;
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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 = _imageInfo.ImageSize / _imageInfo.SectorSize;
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_imageInfo.Comments = StringHandlers.CToString(_comment, Encoding.GetEncoding(932));
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_imageInfo.MetadataMediaType = MetadataMediaType.BlockMedia;
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switch(_imageInfo.MediaType)
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{
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case MediaType.SHARP_525:
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_imageInfo.Cylinders = 77;
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_imageInfo.Heads = 2;
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_imageInfo.SectorsPerTrack = 8;
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break;
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case MediaType.SHARP_525_9:
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_imageInfo.Cylinders = 80;
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_imageInfo.Heads = 2;
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_imageInfo.SectorsPerTrack = 9;
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break;
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case MediaType.DOS_525_HD:
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_imageInfo.Cylinders = 80;
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_imageInfo.Heads = 2;
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_imageInfo.SectorsPerTrack = 15;
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break;
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case MediaType.SHARP_35_9:
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_imageInfo.Cylinders = 80;
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_imageInfo.Heads = 2;
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_imageInfo.SectorsPerTrack = 9;
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break;
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case MediaType.DOS_35_HD:
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_imageInfo.Cylinders = 80;
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_imageInfo.Heads = 2;
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_imageInfo.SectorsPerTrack = 18;
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break;
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case MediaType.NEC_8_DD:
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case MediaType.NEC_8_SD:
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_imageInfo.Cylinders = 77;
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_imageInfo.Heads = 2;
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_imageInfo.SectorsPerTrack = 26;
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break;
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}
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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, bool negative, out byte[] buffer, out SectorStatus sectorStatus)
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{
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sectorStatus = SectorStatus.Dumped;
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return ReadSectors(sectorAddress, negative, 1, out buffer, out _);
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}
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/// <inheritdoc />
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public ErrorNumber ReadSectors(ulong sectorAddress, bool negative, uint length, out byte[] buffer,
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out SectorStatus[] sectorStatus)
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{
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buffer = null;
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sectorStatus = null;
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if(negative) return ErrorNumber.NotSupported;
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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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sectorStatus = new SectorStatus[length];
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for(uint i = 0; i < length; i++) sectorStatus[i] = SectorStatus.Dumped;
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Stream stream = _dimImageFilter.GetDataForkStream();
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stream.Seek((long)(DATA_OFFSET + 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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} |