From 724add9545c5d3ec5a33f3d37b2aab54f02102a6 Mon Sep 17 00:00:00 2001 From: Natalia Portillo Date: Fri, 10 Apr 2026 23:20:14 +0100 Subject: [PATCH] [AODOS] Add support for analyze command --- Aaru.Filesystems/AODOS/Analyze.cs | 200 ++++++++++++++++++++++++++++++ 1 file changed, 200 insertions(+) create mode 100644 Aaru.Filesystems/AODOS/Analyze.cs diff --git a/Aaru.Filesystems/AODOS/Analyze.cs b/Aaru.Filesystems/AODOS/Analyze.cs new file mode 100644 index 000000000..a3eb19b1c --- /dev/null +++ b/Aaru.Filesystems/AODOS/Analyze.cs @@ -0,0 +1,200 @@ +// /*************************************************************************** +// Aaru Data Preservation Suite +// ---------------------------------------------------------------------------- +// +// Filename : Analyze.cs +// Author(s) : Natalia Portillo +// +// Component : AO-DOS file system plugin. +// +// --[ License ] -------------------------------------------------------------- +// +// This library is free software; you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as +// published by the Free Software Foundation; either version 2.1 of the +// License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, but +// WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, see . +// +// ---------------------------------------------------------------------------- +// Copyright © 2011-2026 Natalia Portillo +// ****************************************************************************/ + +using System; +using System.Collections.Generic; +using System.Linq; +using Aaru.CommonTypes; +using Aaru.CommonTypes.Enums; +using Aaru.CommonTypes.Structs; +using Aaru.Helpers; + +namespace Aaru.Filesystems; + +// Information has been extracted looking at available disk images +/// +public sealed partial class AODOS +{ +#region IReadOnlyFilesystem Members + + /// + public ErrorNumber GetFilesWithAffectedSectors(IEnumerable<(ulong Start, ulong End)> sectorExtents, + out List files, + InitProgressHandler initProgress = null, + UpdateProgressHandler updateProgress = null, + PulseProgressHandler pulseProgress = null, + EndProgressHandler endProgress = null) + { + files = []; + + if(!_mounted) return ErrorNumber.AccessDenied; + if(sectorExtents is null) return ErrorNumber.InvalidArgument; + + List<(ulong Start, ulong End)> normalizedExtents = NormalizeAnalyzeExtents(sectorExtents); + + if(normalizedExtents.Count == 0 || _directoryCache.Count == 0) return ErrorNumber.NoError; + + try + { + initProgress?.Invoke(); + pulseProgress?.Invoke("/"); + + Dictionary directoryNames = []; + + foreach(DirectoryEntry entry in _directoryCache) + { + if(entry.directoryNumber == 0 || entry.directory != 0) continue; + + string directoryName = StringHandlers.CToString(entry.filename, _encoding).Trim(); + + if(string.IsNullOrWhiteSpace(directoryName) || directoryNames.ContainsKey(entry.directoryNumber)) + continue; + + directoryNames.Add(entry.directoryNumber, directoryName); + } + + List<(string Path, DirectoryEntry Entry)> orderedEntries = []; + + foreach(DirectoryEntry entry in _directoryCache) + { + if(entry.directoryNumber > 0) continue; + + string fileName = StringHandlers.CToString(entry.filename, _encoding).Trim(); + + if(string.IsNullOrWhiteSpace(fileName)) continue; + + if(entry.directory == 0) + orderedEntries.Add(("/" + fileName, entry)); + else if(directoryNames.TryGetValue(entry.directory, out string directoryName)) + orderedEntries.Add(("/" + directoryName + "/" + fileName, entry)); + } + + orderedEntries = orderedEntries.OrderBy(static entry => entry.Path, StringComparer.CurrentCultureIgnoreCase) + .ToList(); + + long maximum = orderedEntries.Count > 0 ? orderedEntries.Count : 1; + + for(var i = 0; i < orderedEntries.Count; i++) + { + updateProgress?.Invoke(orderedEntries[i].Path, i + 1, maximum); + AddOverlappingFile(orderedEntries[i].Path, orderedEntries[i].Entry, normalizedExtents, files); + } + + return ErrorNumber.NoError; + } + finally + { + endProgress?.Invoke(); + } + } + +#endregion + + void AddOverlappingFile(string path, in DirectoryEntry entry, IReadOnlyList<(ulong Start, ulong End)> sectorExtents, + List files) + { + if(entry.directoryNumber > 0 || entry.length == 0 || entry.blocks == 0) return; + + List<(ulong Start, ulong End)> overlaps = FindOverlappingExtents(entry, sectorExtents); + + if(overlaps.Count == 0) return; + + files.Add(new FileSectorInfo + { + Path = path, + Inode = entry.blockNumber, + AffectedSectors = overlaps + }); + } + + List<(ulong Start, ulong End)> FindOverlappingExtents(in DirectoryEntry entry, + IReadOnlyList<(ulong Start, ulong End)> sectorExtents) + { + List<(ulong Start, ulong End)> overlaps = []; + + ulong sectorCount = entry.blocks; + + if(entry.length > 0) + { + ulong logicalSectors = ((ulong)entry.length + SECTOR_SIZE - 1) / SECTOR_SIZE; + + if(logicalSectors > 0 && logicalSectors < sectorCount) sectorCount = logicalSectors; + } + + if(sectorCount == 0) return overlaps; + + ulong startSector = _partition.Start + entry.blockNumber; + + AddExtentOverlaps(startSector, startSector + sectorCount - 1, sectorExtents, overlaps); + + return NormalizeAnalyzeExtents(overlaps); + } + + static void AddExtentOverlaps(ulong startSector, ulong endSector, + IReadOnlyList<(ulong Start, ulong End)> sectorExtents, + List<(ulong Start, ulong End)> overlaps) + { + foreach((ulong Start, ulong End) requestedExtent in sectorExtents) + { + if(requestedExtent.End < startSector || requestedExtent.Start > endSector) continue; + + overlaps.Add((Math.Max(startSector, requestedExtent.Start), Math.Min(endSector, requestedExtent.End))); + } + } + + static List<(ulong Start, ulong End)> NormalizeAnalyzeExtents(IEnumerable<(ulong Start, ulong End)> extents) + { + var orderedExtents = extents.Where(static extent => extent.End >= extent.Start) + .OrderBy(static extent => extent.Start) + .ThenBy(static extent => extent.End) + .ToList(); + + List<(ulong Start, ulong End)> normalizedExtents = []; + + if(orderedExtents.Count == 0) return normalizedExtents; + + (ulong Start, ulong End) currentExtent = orderedExtents[0]; + + for(var i = 1; i < orderedExtents.Count; i++) + { + if(orderedExtents[i].Start <= currentExtent.End + 1) + { + currentExtent.End = Math.Max(currentExtent.End, orderedExtents[i].End); + + continue; + } + + normalizedExtents.Add(currentExtent); + currentExtent = orderedExtents[i]; + } + + normalizedExtents.Add(currentExtent); + + return normalizedExtents; + } +} \ No newline at end of file