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312 lines
14 KiB
C#
312 lines
14 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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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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// --[ Description ] ----------------------------------------------------------
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//
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// Methods to handle Microsoft FAT filesystem directories.
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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 © 2011-2019 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 DiscImageChef.CommonTypes.Structs;
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using DiscImageChef.Helpers;
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namespace DiscImageChef.Filesystems.FAT
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{
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public partial class FAT
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{
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/// <summary>
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/// Solves a symbolic link.
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/// </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 Errno ReadLink(string path, out string dest)
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{
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dest = null;
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return Errno.NotSupported;
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}
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/// <summary>
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/// Lists contents from a directory.
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/// </summary>
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/// <param name="path">Directory path.</param>
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/// <param name="contents">Directory contents.</param>
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public Errno ReadDir(string path, out List<string> contents)
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{
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contents = null;
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if(!mounted) return Errno.AccessDenied;
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if(string.IsNullOrWhiteSpace(path) || path == "/")
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{
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contents = rootDirectoryCache.Keys.ToList();
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return Errno.NoError;
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}
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string cutPath = path.StartsWith("/", StringComparison.Ordinal)
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? path.Substring(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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contents = currentDirectory.Keys.ToList();
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return Errno.NoError;
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}
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string[] pieces = cutPath.Split(new[] {'/'}, 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)) return Errno.NoSuchFile;
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if(!entry.Value.Dirent.attributes.HasFlag(FatAttributes.Subdirectory)) return Errno.NotDirectory;
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string currentPath = pieces[0];
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currentDirectory = rootDirectoryCache;
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for(int 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)) return Errno.NoSuchFile;
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if(!entry.Value.Dirent.attributes.HasFlag(FatAttributes.Subdirectory)) return Errno.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) currentCluster += (uint)(entry.Value.Dirent.ea_handle << 16);
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if(directoryCache.TryGetValue(currentPath, out currentDirectory)) continue;
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uint[] clusters = GetClusters(currentCluster);
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if(clusters is null) return Errno.InvalidArgument;
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byte[] directoryBuffer = new byte[bytesPerCluster * clusters.Length];
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for(int i = 0; i < clusters.Length; i++)
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{
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byte[] buffer = image.ReadSectors(firstClusterSector + clusters[i] * sectorsPerCluster,
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sectorsPerCluster);
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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(int 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) 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) 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) 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) continue;
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if(lfnEntry.checksum != lastLfnChecksum) 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) continue;
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// Self
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if(Encoding.GetString(dirent.filename).TrimEnd() == ".") continue;
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// Parent
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if(Encoding.GetString(dirent.filename).TrimEnd() == "..") continue;
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// Deleted
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if(dirent.filename[0] == DIRENT_DELETED) continue;
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string filename;
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if(dirent.attributes.HasFlag(FatAttributes.VolumeLabel)) continue;
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CompleteDirectoryEntry completeEntry = new CompleteDirectoryEntry {Dirent = dirent};
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if((@namespace == Namespace.Lfn || @namespace == 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) 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(@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 != "") filename = name + "." + extension;
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else 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
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.SizeOf<HumanDirectoryEntry
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>());
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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 != "") filename = name + name2 + "." + extension;
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else filename = name + name2;
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completeEntry.HumanName = filename;
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}
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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 == Namespace.Os2 || @namespace == Namespace.Ecs))
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{
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List<KeyValuePair<string, CompleteDirectoryEntry>> filesWithEas =
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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) continue;
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if(!eas.TryGetValue("com.microsoft.os2.longname", out byte[] longnameEa)) continue;
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if(BitConverter.ToUInt16(longnameEa, 0) != EAT_ASCII) continue;
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ushort longnameSize = BitConverter.ToUInt16(longnameEa, 2);
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if(longnameSize + 4 > longnameEa.Length) continue;
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byte[] 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)) 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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List<KeyValuePair<string, CompleteDirectoryEntry>> fat32EaSidecars =
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currentDirectory.Where(t => t.Key.EndsWith(FAT32_EA_TAIL, true, cultureInfo)).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
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.TryGetValue(sidecar.Key.Substring(0, sidecar.Key.Length - FAT32_EA_TAIL.Length),
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out CompleteDirectoryEntry fileWithEa)) 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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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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fileWithEa.Fat32Ea = sidecar.Value.Dirent;
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if(!debug) 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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contents = currentDirectory?.Keys.ToList();
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return Errno.NoError;
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}
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}
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} |