mirror of
https://github.com/aaru-dps/Aaru.git
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247 lines
8.8 KiB
C#
247 lines
8.8 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 Dunfield's IMD 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;
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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 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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public sealed partial class Imd
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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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var cmt = new MemoryStream();
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stream.Seek(0x1F, SeekOrigin.Begin);
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for(uint i = 0; i < stream.Length; i++)
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{
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var b = (byte)stream.ReadByte();
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if(b == 0x1A) break;
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cmt.WriteByte(b);
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}
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_imageInfo.Comments = StringHandlers.CToString(cmt.ToArray());
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_sectorsData = [];
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byte currentCylinder = 0;
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_imageInfo.Cylinders = 1;
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_imageInfo.Heads = 1;
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ulong currentLba = 0;
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TransferRate mode = TransferRate.TwoHundred;
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while(stream.Position + 5 < stream.Length)
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{
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mode = (TransferRate)stream.ReadByte();
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var cylinder = (byte)stream.ReadByte();
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var head = (byte)stream.ReadByte();
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var spt = (byte)stream.ReadByte();
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var n = (byte)stream.ReadByte();
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var idmap = new byte[spt];
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var cylmap = new byte[spt];
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var headmap = new byte[spt];
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var bps = new ushort[spt];
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if(cylinder != currentCylinder)
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{
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currentCylinder = cylinder;
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_imageInfo.Cylinders++;
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}
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if((head & 1) == 1) _imageInfo.Heads = 2;
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stream.EnsureRead(idmap, 0, idmap.Length);
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if((head & SECTOR_CYLINDER_MAP_MASK) == SECTOR_CYLINDER_MAP_MASK)
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stream.EnsureRead(cylmap, 0, cylmap.Length);
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if((head & SECTOR_HEAD_MAP_MASK) == SECTOR_HEAD_MAP_MASK) stream.EnsureRead(headmap, 0, headmap.Length);
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if(n == 0xFF)
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{
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var bpsbytes = new byte[spt * 2];
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stream.EnsureRead(bpsbytes, 0, bpsbytes.Length);
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for(var i = 0; i < spt; i++) bps[i] = BitConverter.ToUInt16(bpsbytes, i * 2);
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}
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else
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for(var i = 0; i < spt; i++)
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bps[i] = (ushort)(128 << n);
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if(spt > _imageInfo.SectorsPerTrack) _imageInfo.SectorsPerTrack = spt;
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SortedDictionary<byte, byte[]> track = new();
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for(var i = 0; i < spt; i++)
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{
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var type = (SectorType)stream.ReadByte();
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var data = new byte[bps[i]];
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// TODO; Handle disks with different bps in track 0
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if(bps[i] > _imageInfo.SectorSize) _imageInfo.SectorSize = bps[i];
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// TODO: Preserve sector status information
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switch(type)
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{
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case SectorType.Unavailable:
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if(!track.ContainsKey(idmap[i])) track.Add(idmap[i], data);
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break;
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case SectorType.Normal:
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case SectorType.Deleted:
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case SectorType.Error:
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case SectorType.DeletedError:
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stream.EnsureRead(data, 0, data.Length);
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if(!track.ContainsKey(idmap[i])) track.Add(idmap[i], data);
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_imageInfo.ImageSize += (ulong)data.Length;
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break;
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case SectorType.Compressed:
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case SectorType.CompressedDeleted:
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case SectorType.CompressedError:
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case SectorType.CompressedDeletedError:
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var filling = (byte)stream.ReadByte();
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ArrayHelpers.ArrayFill(data, filling);
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if(!track.ContainsKey(idmap[i])) track.Add(idmap[i], data);
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break;
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default:
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AaruLogging.Error(string.Format(Localization.Invalid_sector_type_0, (byte)type));
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return ErrorNumber.InvalidArgument;
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}
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}
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foreach(KeyValuePair<byte, byte[]> kvp in track)
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{
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_sectorsData.Add(kvp.Value);
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currentLba++;
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}
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}
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_imageInfo.Application = "IMD";
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// TODO: The header is the date of dump or the date of the application compilation?
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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.Comments = StringHandlers.CToString(cmt.ToArray());
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_imageInfo.Sectors = currentLba;
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_imageInfo.MediaType = MediaType.Unknown;
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MediaEncoding mediaEncoding = MediaEncoding.MFM;
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if(mode is TransferRate.TwoHundred or TransferRate.ThreeHundred or TransferRate.FiveHundred)
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mediaEncoding = MediaEncoding.FM;
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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, false));
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switch(_imageInfo.MediaType)
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{
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case MediaType.NEC_525_HD when mode == TransferRate.FiveHundredMfm:
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_imageInfo.MediaType = MediaType.NEC_35_HD_8;
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break;
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case MediaType.DOS_525_HD when mode == TransferRate.FiveHundredMfm:
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_imageInfo.MediaType = MediaType.NEC_35_HD_15;
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break;
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case MediaType.RX50 when mode == TransferRate.FiveHundredMfm:
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_imageInfo.MediaType = MediaType.ATARI_35_SS_DD;
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break;
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}
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_imageInfo.MetadataMediaType = MetadataMediaType.BlockMedia;
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AaruLogging.Verbose(Localization.IMD_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.IMD_comments_0, _imageInfo.Comments);
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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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var ms = new MemoryStream();
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sectorStatus = Enumerable.Repeat(SectorStatus.Dumped, (int)length).ToArray();
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for(var i = 0; i < length; i++)
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ms.Write(_sectorsData[(int)sectorAddress + i], 0, _sectorsData[(int)sectorAddress + i].Length);
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buffer = ms.ToArray();
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return ErrorNumber.NoError;
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}
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#endregion
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} |