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https://github.com/aaru-dps/Aaru.git
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[FAT] Add support for analyze command
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230
Aaru.Filesystems/FAT/Analyze.cs
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230
Aaru.Filesystems/FAT/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 : Microsoft FAT filesystem plugin.
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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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namespace Aaru.Filesystems;
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public sealed partial class FAT
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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, List<(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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if(node is not FatDirNode dirNode)
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{
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CloseDir(node);
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return ErrorNumber.InvalidArgument;
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}
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CompleteDirectoryEntry[] entries = dirNode.Entries?.Where(static entry => entry != null)
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.OrderBy(static entry => entry.ToString(),
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StringComparer.CurrentCultureIgnoreCase)
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.ToArray() ?? [];
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CloseDir(node);
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long maximum = entries.Length > 0 ? entries.Length : 1;
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for(var i = 0; i < entries.Length; i++)
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{
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CompleteDirectoryEntry entry = entries[i];
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string entryName = NormalizePathComponent(entry.ToString());
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if(string.IsNullOrWhiteSpace(entryName)) continue;
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string entryPath = path == "/" ? "/" + entryName : path + "/" + entryName;
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updateProgress?.Invoke(entryPath, i + 1, maximum);
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if(entry.Dirent.attributes.HasFlag(FatAttributes.Subdirectory))
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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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AddOverlappingFile(entryPath, entry, sectorExtents, files);
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}
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return ErrorNumber.NoError;
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}
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void AddOverlappingFile(string path, CompleteDirectoryEntry entry,
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IReadOnlyList<(ulong Start, ulong End)> sectorExtents, List<FileSectorInfo> files)
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{
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uint startCluster = GetEntryStartCluster(entry.Dirent);
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if(entry.Dirent.size == 0 || startCluster == 0) return;
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uint[] clusters = GetClusters(startCluster);
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if(clusters is null || clusters.Length == 0) return;
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List<(ulong Start, ulong End)> overlaps = FindOverlappingExtents(clusters, entry.Dirent.size, sectorExtents);
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if(overlaps.Count == 0) return;
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files.Add(new FileSectorInfo
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{
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Path = path,
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Inode = startCluster,
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AffectedSectors = overlaps
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});
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}
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uint GetEntryStartCluster(in DirectoryEntry entry) =>
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_fat32 ? ((uint)entry.ea_handle << 16) + entry.start_cluster : entry.start_cluster;
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List<(ulong Start, ulong End)> FindOverlappingExtents(uint[] clusters, uint logicalSize,
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IReadOnlyList<(ulong Start, ulong End)> sectorExtents)
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{
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List<(ulong Start, ulong End)> overlaps = [];
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ulong remainingBytes = logicalSize;
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ulong sectorSize = _image.Info.SectorSize;
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foreach(uint cluster in clusters)
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{
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if(remainingBytes == 0) break;
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ulong bytesInCluster = Math.Min(_bytesPerCluster, remainingBytes);
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if(bytesInCluster == 0) break;
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ulong startSector = _firstClusterSector + (ulong)cluster * _sectorsPerCluster;
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ulong sectorCount = bytesInCluster / sectorSize;
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if(bytesInCluster % sectorSize > 0) sectorCount++;
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if(sectorCount == 0) sectorCount = 1;
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AddExtentOverlaps(startSector, startSector + sectorCount - 1, sectorExtents, overlaps);
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remainingBytes -= bytesInCluster;
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}
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return NormalizeAnalyzeExtents(overlaps);
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}
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static string NormalizePathComponent(string name) => name ?? string.Empty;
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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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