mirror of
https://github.com/aaru-dps/Aaru.git
synced 2025-12-16 19:24:25 +00:00
Natalia Portillo
7363a5d9c5
Rider EAP was having a bug interpreting .editorconfig that didn't generate the code style as we wanted. This is now done with Rider-stable.
458 lines
17 KiB
C#
458 lines
17 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Dir.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 © 2011-2023 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.Globalization;
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using System.Linq;
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using System.Text;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Console;
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using Aaru.Helpers;
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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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/// <summary>Solves a symbolic link.</summary>
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/// <param name="path">Link path.</param>
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/// <param name="dest">Link destination.</param>
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public ErrorNumber ReadLink(string path, out string dest)
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{
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dest = null;
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return ErrorNumber.NotSupported;
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}
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/// <inheritdoc />
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public ErrorNumber OpenDir(string path, out IDirNode node)
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{
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node = null;
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if(!_mounted)
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return ErrorNumber.AccessDenied;
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if(string.IsNullOrWhiteSpace(path) || path == "/")
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{
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node = new FatDirNode
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{
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Path = path,
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_position = 0,
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_entries = _rootDirectoryCache.Values.ToArray()
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};
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return ErrorNumber.NoError;
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}
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string cutPath = path.StartsWith("/", StringComparison.Ordinal)
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? path[1..].ToLower(_cultureInfo)
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: path.ToLower(_cultureInfo);
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if(_directoryCache.TryGetValue(cutPath, out Dictionary<string, CompleteDirectoryEntry> currentDirectory))
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{
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node = new FatDirNode
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{
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Path = path,
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_position = 0,
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_entries = currentDirectory.Values.ToArray()
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};
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return ErrorNumber.NoError;
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}
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string[] pieces = cutPath.Split(new[]
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{
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'/'
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}, StringSplitOptions.RemoveEmptyEntries);
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KeyValuePair<string, CompleteDirectoryEntry> entry =
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_rootDirectoryCache.FirstOrDefault(t => t.Key.ToLower(_cultureInfo) == pieces[0]);
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if(string.IsNullOrEmpty(entry.Key))
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return ErrorNumber.NoSuchFile;
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if(!entry.Value.Dirent.attributes.HasFlag(FatAttributes.Subdirectory))
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return ErrorNumber.NotDirectory;
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string currentPath = pieces[0];
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currentDirectory = _rootDirectoryCache;
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for(var p = 0; p < pieces.Length; p++)
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{
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entry = currentDirectory.FirstOrDefault(t => t.Key.ToLower(_cultureInfo) == pieces[p]);
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if(string.IsNullOrEmpty(entry.Key))
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return ErrorNumber.NoSuchFile;
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if(!entry.Value.Dirent.attributes.HasFlag(FatAttributes.Subdirectory))
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return ErrorNumber.NotDirectory;
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currentPath = p == 0 ? pieces[0] : $"{currentPath}/{pieces[p]}";
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uint currentCluster = entry.Value.Dirent.start_cluster;
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if(_fat32)
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currentCluster += (uint)(entry.Value.Dirent.ea_handle << 16);
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if(_directoryCache.TryGetValue(currentPath, out currentDirectory))
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continue;
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// Reserved unallocated directory, seen in Atari ST
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if(currentCluster == 0)
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{
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_directoryCache[currentPath] = new Dictionary<string, CompleteDirectoryEntry>();
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node = new FatDirNode
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{
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Path = path,
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_position = 0,
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_entries = Array.Empty<CompleteDirectoryEntry>()
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};
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return ErrorNumber.NoError;
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}
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uint[] clusters = GetClusters(currentCluster);
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if(clusters is null)
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return ErrorNumber.InvalidArgument;
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var directoryBuffer = new byte[_bytesPerCluster * clusters.Length];
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for(var i = 0; i < clusters.Length; i++)
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{
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ErrorNumber errno = _image.ReadSectors(_firstClusterSector + clusters[i] * _sectorsPerCluster,
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_sectorsPerCluster, out byte[] buffer);
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if(errno != ErrorNumber.NoError)
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return errno;
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Array.Copy(buffer, 0, directoryBuffer, i * _bytesPerCluster, _bytesPerCluster);
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}
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currentDirectory = new Dictionary<string, CompleteDirectoryEntry>();
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byte[] lastLfnName = null;
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byte lastLfnChecksum = 0;
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for(var pos = 0; pos < directoryBuffer.Length; pos += Marshal.SizeOf<DirectoryEntry>())
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{
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DirectoryEntry dirent =
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Marshal.ByteArrayToStructureLittleEndian<DirectoryEntry>(directoryBuffer, pos,
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Marshal.SizeOf<DirectoryEntry>());
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if(dirent.filename[0] == DIRENT_FINISHED)
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break;
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if(dirent.attributes.HasFlag(FatAttributes.LFN))
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{
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if(_namespace != Namespace.Lfn && _namespace != Namespace.Ecs)
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continue;
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LfnEntry lfnEntry =
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Marshal.ByteArrayToStructureLittleEndian<LfnEntry>(directoryBuffer, pos,
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Marshal.SizeOf<LfnEntry>());
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int lfnSequence = lfnEntry.sequence & LFN_MASK;
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if((lfnEntry.sequence & LFN_ERASED) > 0)
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continue;
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if((lfnEntry.sequence & LFN_LAST) > 0)
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{
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lastLfnName = new byte[lfnSequence * 26];
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lastLfnChecksum = lfnEntry.checksum;
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}
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if(lastLfnName is null)
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continue;
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if(lfnEntry.checksum != lastLfnChecksum)
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continue;
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lfnSequence--;
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Array.Copy(lfnEntry.name1, 0, lastLfnName, lfnSequence * 26, 10);
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Array.Copy(lfnEntry.name2, 0, lastLfnName, lfnSequence * 26 + 10, 12);
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Array.Copy(lfnEntry.name3, 0, lastLfnName, lfnSequence * 26 + 22, 4);
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continue;
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}
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// Not a correct entry
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if(dirent.filename[0] < DIRENT_MIN && dirent.filename[0] != DIRENT_E5)
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continue;
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// Self
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if(_encoding.GetString(dirent.filename).TrimEnd() == ".")
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continue;
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// Parent
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if(_encoding.GetString(dirent.filename).TrimEnd() == "..")
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continue;
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// Deleted
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if(dirent.filename[0] == DIRENT_DELETED)
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continue;
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string filename;
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if(dirent.attributes.HasFlag(FatAttributes.VolumeLabel))
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continue;
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var completeEntry = new CompleteDirectoryEntry
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{
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Dirent = dirent
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};
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if(_namespace is Namespace.Lfn or Namespace.Ecs && lastLfnName != null)
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{
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byte calculatedLfnChecksum = LfnChecksum(dirent.filename, dirent.extension);
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if(calculatedLfnChecksum == lastLfnChecksum)
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{
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filename = StringHandlers.CToString(lastLfnName, Encoding.Unicode, true);
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completeEntry.Lfn = filename;
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lastLfnName = null;
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lastLfnChecksum = 0;
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}
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}
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if(dirent.filename[0] == DIRENT_E5)
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dirent.filename[0] = DIRENT_DELETED;
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string name = _encoding.GetString(dirent.filename).TrimEnd();
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string extension = _encoding.GetString(dirent.extension).TrimEnd();
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if(name == "" && extension == "")
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{
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AaruConsole.DebugWriteLine(MODULE_NAME, Localization.Found_empty_filename_in_0, path);
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if(!_debug || dirent is { size: > 0, start_cluster: 0 })
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continue; // Skip invalid name
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// If debug, add it
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name = ":{EMPTYNAME}:";
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// Try to create a unique filename with an extension from 000 to 999
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for(var uniq = 0; uniq < 1000; uniq++)
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{
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extension = $"{uniq:D03}";
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if(!currentDirectory.ContainsKey($"{name}.{extension}"))
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break;
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}
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// If we couldn't find it, just skip over
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if(currentDirectory.ContainsKey($"{name}.{extension}"))
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continue;
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}
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if(_namespace == Namespace.Nt)
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{
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if(dirent.caseinfo.HasFlag(CaseInfo.LowerCaseExtension))
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extension = extension.ToLower(CultureInfo.CurrentCulture);
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if(dirent.caseinfo.HasFlag(CaseInfo.LowerCaseBasename))
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name = name.ToLower(CultureInfo.CurrentCulture);
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}
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if(extension != "")
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filename = name + "." + extension;
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else
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filename = name;
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if(_namespace == Namespace.Human)
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{
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HumanDirectoryEntry humanEntry =
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Marshal.ByteArrayToStructureLittleEndian<HumanDirectoryEntry>(directoryBuffer, pos,
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Marshal.SizeOf<HumanDirectoryEntry>());
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completeEntry.HumanDirent = humanEntry;
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name = StringHandlers.CToString(humanEntry.name1, _encoding).TrimEnd();
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extension = StringHandlers.CToString(humanEntry.extension, _encoding).TrimEnd();
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string name2 = StringHandlers.CToString(humanEntry.name2, _encoding).TrimEnd();
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if(extension != "")
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filename = name + name2 + "." + extension;
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else
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filename = name + name2;
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completeEntry.HumanName = filename;
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}
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// Atari ST allows slash AND colon so cannot simply substitute one for the other like in Mac filesystems
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filename = filename.Replace('/', '\u2215');
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// Using array accessor ensures that repeated entries just get substituted.
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// Repeated entries are not allowed but some bad implementations (e.g. FAT32.IFS)allow to create them
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// when using spaces
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completeEntry.Shortname = filename;
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currentDirectory[completeEntry.ToString()] = completeEntry;
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}
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// Check OS/2 .LONGNAME
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if(_eaCache != null && _namespace is Namespace.Os2 or Namespace.Ecs && !_fat32)
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{
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var filesWithEas = currentDirectory.Where(t => t.Value.Dirent.ea_handle != 0).ToList();
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foreach(KeyValuePair<string, CompleteDirectoryEntry> fileWithEa in filesWithEas)
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{
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Dictionary<string, byte[]> eas = GetEas(fileWithEa.Value.Dirent.ea_handle);
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if(eas is null)
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continue;
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if(!eas.TryGetValue("com.microsoft.os2.longname", out byte[] longnameEa))
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continue;
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if(BitConverter.ToUInt16(longnameEa, 0) != EAT_ASCII)
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continue;
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var longnameSize = BitConverter.ToUInt16(longnameEa, 2);
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if(longnameSize + 4 > longnameEa.Length)
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continue;
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var longnameBytes = new byte[longnameSize];
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Array.Copy(longnameEa, 4, longnameBytes, 0, longnameSize);
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string longname = StringHandlers.CToString(longnameBytes, _encoding);
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if(string.IsNullOrWhiteSpace(longname))
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continue;
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// Forward slash is allowed in .LONGNAME, so change it to visually similar division slash
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longname = longname.Replace('/', '\u2215');
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fileWithEa.Value.Longname = longname;
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currentDirectory.Remove(fileWithEa.Key);
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currentDirectory[fileWithEa.Value.ToString()] = fileWithEa.Value;
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}
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}
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// Check FAT32.IFS EAs
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if(_fat32 || _debug)
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{
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var fat32EaSidecars = currentDirectory.Where(t => t.Key.EndsWith(FAT32_EA_TAIL, true, _cultureInfo)).
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ToList();
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foreach(KeyValuePair<string, CompleteDirectoryEntry> sidecar in fat32EaSidecars)
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{
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// No real file this sidecar accompanies
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if(!currentDirectory.TryGetValue(sidecar.Key[..^FAT32_EA_TAIL.Length],
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out CompleteDirectoryEntry fileWithEa))
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continue;
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// If not in debug mode we will consider the lack of EA bitflags to mean the EAs are corrupted or not real
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if(!_debug)
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{
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if(!fileWithEa.Dirent.caseinfo.HasFlag(CaseInfo.NormalEaOld) &&
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!fileWithEa.Dirent.caseinfo.HasFlag(CaseInfo.CriticalEa) &&
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!fileWithEa.Dirent.caseinfo.HasFlag(CaseInfo.NormalEa) &&
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!fileWithEa.Dirent.caseinfo.HasFlag(CaseInfo.CriticalEa))
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continue;
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}
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fileWithEa.Fat32Ea = sidecar.Value.Dirent;
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if(!_debug)
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currentDirectory.Remove(sidecar.Key);
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}
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}
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_directoryCache.Add(currentPath, currentDirectory);
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}
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if(currentDirectory is null)
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return ErrorNumber.NoSuchFile;
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node = new FatDirNode
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{
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Path = path,
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_position = 0,
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_entries = currentDirectory.Values.ToArray()
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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 ReadDir(IDirNode node, out string filename)
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{
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filename = null;
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if(!_mounted)
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return ErrorNumber.AccessDenied;
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if(node is not FatDirNode mynode)
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return ErrorNumber.InvalidArgument;
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if(mynode._position < 0)
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return ErrorNumber.InvalidArgument;
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if(mynode._position >= mynode._entries.Length)
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return ErrorNumber.NoError;
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CompleteDirectoryEntry entry = mynode._entries[mynode._position];
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filename = _namespace switch
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{
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Namespace.Ecs when entry.Longname is not null => entry.Longname,
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Namespace.Ecs when entry.Longname is null && entry.Lfn is not null => entry.Lfn,
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Namespace.Lfn when entry.Lfn is not null => entry.Lfn,
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Namespace.Human when entry.HumanName is not null => entry.HumanName,
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Namespace.Os2 when entry.Longname is not null => entry.Longname,
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_ => entry.Shortname
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};
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mynode._position++;
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber CloseDir(IDirNode node)
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{
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if(node is not FatDirNode mynode)
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return ErrorNumber.InvalidArgument;
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mynode._position = -1;
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mynode._entries = null;
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return ErrorNumber.NoError;
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}
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#endregion
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} |