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[AmigaDOS] Add support for analyze command
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293
Aaru.Filesystems/AmigaDOS/Analyze.cs
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293
Aaru.Filesystems/AmigaDOS/Analyze.cs
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// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Analyze.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Amiga Fast File System plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Sector overlap analysis for AmigaDOS volumes.
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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 © 2011-2026 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.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.CommonTypes.Structs;
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using Aaru.Helpers;
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namespace Aaru.Filesystems;
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/// <inheritdoc />
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public sealed partial class AmigaDOSPlugin
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{
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#region IReadOnlyFilesystem Members
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/// <inheritdoc />
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public ErrorNumber GetFilesWithAffectedSectors(IEnumerable<(ulong Start, ulong End)> sectorExtents,
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out List<FileSectorInfo> files,
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InitProgressHandler initProgress = null,
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UpdateProgressHandler updateProgress = null,
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PulseProgressHandler pulseProgress = null,
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EndProgressHandler endProgress = null)
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{
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files = [];
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if(!_mounted) return ErrorNumber.AccessDenied;
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if(sectorExtents is null) return ErrorNumber.InvalidArgument;
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List<(ulong Start, ulong End)> normalizedExtents = NormalizeAnalyzeExtents(sectorExtents);
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if(normalizedExtents.Count == 0) return ErrorNumber.NoError;
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try
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{
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initProgress?.Invoke();
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return TraverseDirectoryForAffectedSectors("/", normalizedExtents, files, updateProgress, pulseProgress);
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}
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finally
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{
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endProgress?.Invoke();
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}
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}
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#endregion
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ErrorNumber TraverseDirectoryForAffectedSectors(string path, IReadOnlyList<(ulong Start, ulong End)> sectorExtents,
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List<FileSectorInfo> files, UpdateProgressHandler updateProgress,
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PulseProgressHandler pulseProgress)
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{
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pulseProgress?.Invoke(path);
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ErrorNumber errno = OpenDir(path, out IDirNode node);
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if(errno != ErrorNumber.NoError) return errno;
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try
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{
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List<string> entries = [];
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while(true)
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{
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errno = ReadDir(node, out string entryName);
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if(errno != ErrorNumber.NoError) return errno;
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if(entryName is null) break;
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entries.Add(entryName);
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}
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string[] orderedEntries = entries.Where(static entry => !string.IsNullOrWhiteSpace(entry))
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.OrderBy(static entry => entry, StringComparer.OrdinalIgnoreCase)
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.ToArray();
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long maximum = orderedEntries.Length > 0 ? orderedEntries.Length : 1;
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for(var i = 0; i < orderedEntries.Length; i++)
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{
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string entryPath = path == "/" ? "/" + orderedEntries[i] : path + "/" + orderedEntries[i];
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updateProgress?.Invoke(entryPath, i + 1, maximum);
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errno = GetBlockForPath(entryPath, out uint blockNumber);
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if(errno != ErrorNumber.NoError) return errno;
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errno = ReadBlock(blockNumber, out byte[] blockData);
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if(errno != ErrorNumber.NoError) return errno;
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var secType = BigEndianBitConverter.ToUInt32(blockData, blockData.Length - 4);
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int signedSecType = ToSignedSecType(secType);
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if(signedSecType is 1 or 2 or 4)
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{
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errno = TraverseDirectoryForAffectedSectors(entryPath,
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sectorExtents,
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files,
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updateProgress,
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pulseProgress);
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if(errno != ErrorNumber.NoError) return errno;
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continue;
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}
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if(signedSecType is not (-3 or -4 or 3)) continue;
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errno = AddOverlappingFile(entryPath, blockNumber, blockData, sectorExtents, files);
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if(errno != ErrorNumber.NoError) return errno;
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}
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return ErrorNumber.NoError;
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}
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finally
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{
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CloseDir(node);
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}
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}
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ErrorNumber AddOverlappingFile(string path, uint headerBlock, byte[] headerData,
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IReadOnlyList<(ulong Start, ulong End)> sectorExtents, List<FileSectorInfo> files)
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{
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int byteSizeOffset = headerData.Length - 47 * 4;
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var fileSize = BigEndianBitConverter.ToUInt32(headerData, byteSizeOffset);
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if(fileSize == 0) return ErrorNumber.NoError;
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ErrorNumber errno = FindOverlappingExtents(headerBlock,
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headerData,
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fileSize,
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sectorExtents,
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out List<(ulong Start, ulong End)> overlaps);
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if(errno != ErrorNumber.NoError) return errno;
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if(overlaps.Count == 0) return ErrorNumber.NoError;
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files.Add(new FileSectorInfo
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{
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Path = path,
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Inode = headerBlock,
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AffectedSectors = overlaps
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});
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return ErrorNumber.NoError;
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}
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ErrorNumber FindOverlappingExtents(uint currentBlockNumber, byte[] currentBlockData, uint fileSize,
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IReadOnlyList<(ulong Start, ulong End)> sectorExtents,
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out List<(ulong Start, ulong End)> overlaps)
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{
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overlaps = [];
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ulong remainingBytes = fileSize;
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while(remainingBytes > 0 && currentBlockData != null)
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{
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int sizeBlock = currentBlockData.Length / 4;
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int tableEnd = sizeBlock - 51;
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int extensionOffset = sizeBlock - 2;
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for(int key = tableEnd; key >= BLK_TABLE_START && remainingBytes > 0; key--)
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{
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var dataBlockNumber = BigEndianBitConverter.ToUInt32(currentBlockData, key * 4);
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if(dataBlockNumber == 0) continue;
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ulong bytesInBlock = Math.Min(_blockSize, remainingBytes);
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AddBlockOverlaps(dataBlockNumber, bytesInBlock, sectorExtents, overlaps);
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remainingBytes -= bytesInBlock;
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}
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if(remainingBytes == 0) break;
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var nextExtension = BigEndianBitConverter.ToUInt32(currentBlockData, extensionOffset * 4);
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if(nextExtension == 0 || nextExtension == currentBlockNumber) break;
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currentBlockNumber = nextExtension;
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ErrorNumber errno = ReadBlock(nextExtension, out currentBlockData);
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if(errno != ErrorNumber.NoError) return errno;
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}
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overlaps = NormalizeAnalyzeExtents(overlaps);
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return ErrorNumber.NoError;
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}
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void AddBlockOverlaps(uint blockNumber, ulong lengthBytes, IReadOnlyList<(ulong Start, ulong End)> sectorExtents,
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List<(ulong Start, ulong End)> overlaps)
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{
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if(lengthBytes == 0) return;
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ulong absoluteByteOffset = (ulong)blockNumber * _blockSize;
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ulong sectorSize = _imagePlugin.Info.SectorSize;
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ulong startSector = _partition.Start + absoluteByteOffset / sectorSize;
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ulong offsetInSector = absoluteByteOffset % sectorSize;
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ulong sectorsInRun = (lengthBytes + offsetInSector + sectorSize - 1) / sectorSize;
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if(sectorsInRun == 0) sectorsInRun = 1;
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AddExtentOverlaps(startSector, startSector + sectorsInRun - 1, sectorExtents, overlaps);
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}
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static int ToSignedSecType(uint secType)
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{
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var signedSecType = (int)secType;
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if(secType > 0x7FFFFFFF) signedSecType = (int)(secType - 0x100000000);
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return signedSecType;
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}
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static void AddExtentOverlaps(ulong startSector, ulong endSector,
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IReadOnlyList<(ulong Start, ulong End)> sectorExtents,
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List<(ulong Start, ulong End)> overlaps)
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{
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foreach((ulong Start, ulong End) requestedExtent in sectorExtents)
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{
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if(requestedExtent.End < startSector || requestedExtent.Start > endSector) continue;
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overlaps.Add((Math.Max(startSector, requestedExtent.Start), Math.Min(endSector, requestedExtent.End)));
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}
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}
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static List<(ulong Start, ulong End)> NormalizeAnalyzeExtents(IEnumerable<(ulong Start, ulong End)> extents)
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{
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var orderedExtents = extents.Where(static extent => extent.End >= extent.Start)
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.OrderBy(static extent => extent.Start)
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.ThenBy(static extent => extent.End)
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.ToList();
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List<(ulong Start, ulong End)> normalizedExtents = [];
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if(orderedExtents.Count == 0) return normalizedExtents;
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(ulong Start, ulong End) currentExtent = orderedExtents[0];
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for(var i = 1; i < orderedExtents.Count; i++)
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{
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if(orderedExtents[i].Start <= currentExtent.End + 1)
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{
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currentExtent.End = Math.Max(currentExtent.End, orderedExtents[i].End);
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continue;
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}
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normalizedExtents.Add(currentExtent);
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currentExtent = orderedExtents[i];
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}
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normalizedExtents.Add(currentExtent);
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return normalizedExtents;
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}
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}
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