mirror of
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643 lines
19 KiB
C#
643 lines
19 KiB
C#
//! \file FileSystem.cs
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//! \date Fri Jun 05 15:32:27 2015
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//! \brief Gameres file system abstraction.
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//
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// Copyright (C) 2015 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text.RegularExpressions;
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using GameRes.Strings;
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namespace GameRes
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{
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public interface IFileSystem : IDisposable
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{
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/// <summary>
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/// Returns entry corresponding to the given file or directory within filesystem.
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/// </summary>
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/// <exception cref="FileNotFoundException">File is not found.</exception>
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Entry FindFile (string filename);
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/// <summary>
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/// System.IO.File.Exists() analog.
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/// </summary>
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bool FileExists (string filename);
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/// <summary>
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/// Open file for reading as stream.
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/// </summary>
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Stream OpenStream (Entry entry);
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Stream OpenSeekableStream (Entry entry);
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/// <summary>
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/// Open file for reading as memory-mapped view.
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/// </summary>
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ArcView OpenView (Entry entry);
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/// <summary>
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/// Enumerates subdirectories and files in current directory.
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/// </summary>
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IEnumerable<Entry> GetFiles ();
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/// <summary>
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/// System.IO.Path.Combine() analog.
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/// </summary>
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string CombinePath (string path1, string path2);
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/// <summary>
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/// Recursively enumerates files in the current directory and its subdirectories.
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/// Subdirectory entries are omitted from resulting set.
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/// </summary>
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IEnumerable<Entry> GetFilesRecursive ();
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string CurrentDirectory { get; set; }
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}
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public class SubDirEntry : Entry
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{
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public override string Type { get { return "directory"; } }
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public SubDirEntry (string name)
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{
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Name = name;
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Size = 0;
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}
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}
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public sealed class PhysicalFileSystem : IFileSystem
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{
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public string CurrentDirectory
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{
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get { return Directory.GetCurrentDirectory(); }
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set { Directory.SetCurrentDirectory (value); }
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}
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public string CombinePath (string path1, string path2)
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{
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return Path.Combine (path1, path2);
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}
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public Entry FindFile (string filename)
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{
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var attr = File.GetAttributes (filename);
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if ((attr & FileAttributes.Directory) == FileAttributes.Directory)
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return new SubDirEntry (filename);
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else
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return EntryFromFileInfo (new FileInfo (filename));
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}
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public bool FileExists (string filename)
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{
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return File.Exists (filename);
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}
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public IEnumerable<Entry> GetFiles ()
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{
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var info = new DirectoryInfo (CurrentDirectory);
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foreach (var subdir in info.EnumerateDirectories())
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{
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if (0 != (subdir.Attributes & (FileAttributes.Hidden | FileAttributes.System)))
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continue;
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yield return new SubDirEntry (subdir.FullName);
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}
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foreach (var file in info.EnumerateFiles())
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{
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if (0 != (file.Attributes & FileAttributes.System))
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continue;
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yield return EntryFromFileInfo (file);
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}
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}
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public IEnumerable<Entry> GetFilesRecursive ()
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{
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var info = new DirectoryInfo (CurrentDirectory);
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foreach (var file in info.EnumerateFiles ("*", SearchOption.AllDirectories))
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{
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if (0 != (file.Attributes & (FileAttributes.Hidden | FileAttributes.System)))
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continue;
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yield return EntryFromFileInfo (file);
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}
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}
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private Entry EntryFromFileInfo (FileInfo file)
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{
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var entry = FormatCatalog.Instance.Create<Entry> (file.FullName);
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entry.Size = (uint)Math.Min (file.Length, uint.MaxValue);
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return entry;
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}
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public Stream OpenStream (Entry entry)
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{
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return File.OpenRead (entry.Name);
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}
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public Stream OpenSeekableStream (Entry entry)
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{
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return OpenStream (entry);
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}
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public ArcView OpenView (Entry entry)
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{
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return new ArcView (entry.Name);
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}
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public void Dispose ()
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{
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GC.SuppressFinalize (this);
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}
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}
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public class FlatArchiveFileSystem : IFileSystem
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{
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protected readonly ArcFile m_arc;
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protected readonly Dictionary<string, Entry> m_dir;
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public ArcFile Source { get { return m_arc; } }
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public virtual string CurrentDirectory
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{
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get { return ""; }
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set
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{
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if (string.IsNullOrEmpty (value))
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return;
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if (".." == value || "." == value)
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return;
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if ("\\" == value || "/" == value)
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return;
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throw new DirectoryNotFoundException();
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}
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}
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public FlatArchiveFileSystem (ArcFile arc)
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{
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m_arc = arc;
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m_dir = new Dictionary<string, Entry> (arc.Dir.Count, StringComparer.InvariantCultureIgnoreCase);
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foreach (var entry in arc.Dir)
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{
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m_dir.Add (entry.Name, entry);
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}
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}
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public bool FileExists (string filename)
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{
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return m_dir.ContainsKey (filename);
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}
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public Stream OpenStream (Entry entry)
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{
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return m_arc.OpenEntry (entry);
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}
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public Stream OpenSeekableStream (Entry entry)
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{
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return m_arc.OpenSeekableEntry (entry);
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}
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public ArcView OpenView (Entry entry)
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{
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return m_arc.OpenView (entry);
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}
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public virtual Entry FindFile (string filename)
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{
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Entry entry = null;
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if (!m_dir.TryGetValue (filename, out entry))
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throw new FileNotFoundException();
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return entry;
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}
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public virtual IEnumerable<Entry> GetFiles ()
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{
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return m_arc.Dir;
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}
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public virtual IEnumerable<Entry> GetFilesRecursive ()
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{
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return m_arc.Dir;
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}
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public virtual string CombinePath (string path1, string path2)
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{
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return Path.Combine (path1, path2);
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}
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#region IDisposable Members
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bool _arc_disposed = false;
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public void Dispose ()
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{
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Dispose (true);
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GC.SuppressFinalize (this);
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}
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protected virtual void Dispose (bool disposing)
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{
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if (!_arc_disposed)
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{
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if (disposing)
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{
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m_arc.Dispose();
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}
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_arc_disposed = true;
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}
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}
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#endregion
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}
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public class ArchiveFileSystem : FlatArchiveFileSystem
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{
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private string m_cwd;
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private string PathDelimiter { get; set; }
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private static readonly char[] m_path_delimiters = { '/', '\\' };
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public ArchiveFileSystem (ArcFile arc) : base (arc)
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{
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m_cwd = "";
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PathDelimiter = "/";
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}
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public override string CurrentDirectory
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{
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get { return m_cwd; }
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set { ChDir (value); }
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}
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public override string CombinePath (string path1, string path2)
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{
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return string.Join (PathDelimiter, path1, path2);
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}
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public override Entry FindFile (string filename)
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{
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Entry entry = null;
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if (m_dir.TryGetValue (filename, out entry))
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return entry;
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if (m_dir.Keys.Any (n => n.StartsWith (filename + PathDelimiter)))
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return new SubDirEntry (filename);
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throw new FileNotFoundException();
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}
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static readonly Regex path_re = new Regex (@"\G[/\\]?([^/\\]+)([/\\])");
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public override IEnumerable<Entry> GetFiles ()
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{
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var root_dir = "";
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IEnumerable<Entry> dir = m_arc.Dir;
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if (!string.IsNullOrEmpty (m_cwd))
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{
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root_dir = m_cwd+PathDelimiter;
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dir = from entry in dir
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where entry.Name.StartsWith (root_dir)
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select entry;
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if (!dir.Any())
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{
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throw new DirectoryNotFoundException();
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}
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}
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var subdirs = new HashSet<string>();
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foreach (var entry in dir)
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{
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var match = path_re.Match (entry.Name, root_dir.Length);
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if (match.Success)
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{
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string name = match.Groups[1].Value;
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if (subdirs.Add (name))
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{
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PathDelimiter = match.Groups[2].Value;
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yield return new SubDirEntry (root_dir+name);
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}
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}
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else
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{
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yield return entry;
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}
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}
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}
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public override IEnumerable<Entry> GetFilesRecursive ()
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{
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if (0 == m_cwd.Length)
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return m_arc.Dir;
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else
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return from file in m_arc.Dir
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where file.Name.StartsWith (m_cwd + PathDelimiter)
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select file;
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}
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private void ChDir (string path)
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{
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if (string.IsNullOrEmpty (path))
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{
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m_cwd = "";
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return;
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}
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var cur_dir = new List<string>();
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if (-1 != Array.IndexOf (m_path_delimiters, path[0]))
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{
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path = path.TrimStart (m_path_delimiters);
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}
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else if (".." == path && !string.IsNullOrEmpty (m_cwd))
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{
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cur_dir.AddRange (m_cwd.Split (m_path_delimiters));
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}
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var path_list = path.Split (m_path_delimiters);
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foreach (var dir in path_list)
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{
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if ("." == dir)
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{
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continue;
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}
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else if (".." == dir)
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{
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if (0 == cur_dir.Count)
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continue;
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cur_dir.RemoveAt (cur_dir.Count-1);
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}
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else
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{
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cur_dir.Add (dir);
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}
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}
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string new_path = string.Join (PathDelimiter, cur_dir);
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if (0 != new_path.Length)
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{
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var entry = m_arc.Dir.FirstOrDefault (e => e.Name.StartsWith (new_path + PathDelimiter));
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if (null == entry)
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throw new DirectoryNotFoundException();
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}
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m_cwd = new_path;
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}
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}
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public sealed class FileSystemStack : IDisposable
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{
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Stack<IFileSystem> m_fs_stack = new Stack<IFileSystem>();
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Stack<string> m_arc_name_stack = new Stack<string>();
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public IEnumerable<IFileSystem> All { get { return m_fs_stack; } }
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public IFileSystem Top { get { return m_fs_stack.Peek(); } }
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public int Count { get { return m_fs_stack.Count; } }
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public IEnumerable<string> ArcStack { get { return m_arc_name_stack; } }
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public ArcFile CurrentArchive { get; private set; }
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private IFileSystem LastVisitedArc { get; set; }
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private string LastVisitedPath { get; set; }
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public FileSystemStack ()
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{
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m_fs_stack.Push (new PhysicalFileSystem());
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}
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public void ChDir (Entry entry)
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{
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if (entry is SubDirEntry)
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{
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if (Count > 1 && ".." == entry.Name && string.IsNullOrEmpty (Top.CurrentDirectory))
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{
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Pop();
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}
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else
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{
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Top.CurrentDirectory = entry.Name;
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}
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return;
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}
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if (entry.Name == LastVisitedPath && null != LastVisitedArc)
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{
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Push (LastVisitedPath, LastVisitedArc);
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if (LastVisitedArc is FlatArchiveFileSystem)
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CurrentArchive = (LastVisitedArc as FlatArchiveFileSystem).Source;
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return;
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}
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Flush();
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var arc = ArcFile.TryOpen (entry.Name);
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if (null == arc)
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throw new UnknownFormatException();
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try
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{
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Push (entry.Name, arc.CreateFileSystem());
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CurrentArchive = arc;
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}
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catch
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{
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arc.Dispose();
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throw;
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}
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}
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private void Push (string path, IFileSystem fs)
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{
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m_fs_stack.Push (fs);
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m_arc_name_stack.Push (path);
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}
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internal void Pop ()
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{
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if (m_fs_stack.Count > 1)
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{
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Flush();
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LastVisitedArc = m_fs_stack.Pop();
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LastVisitedPath = m_arc_name_stack.Pop();
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if (m_fs_stack.Count > 1 && m_fs_stack.Peek() is FlatArchiveFileSystem)
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CurrentArchive = (m_fs_stack.Peek() as FlatArchiveFileSystem).Source;
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else
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CurrentArchive = null;
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}
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}
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public void Flush ()
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{
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if (LastVisitedArc != null)
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{
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LastVisitedArc.Dispose();
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LastVisitedArc = null;
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LastVisitedPath = null;
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}
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}
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private bool _disposed = false;
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public void Dispose ()
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{
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if (!_disposed)
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{
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Flush();
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foreach (var fs in m_fs_stack.Reverse())
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fs.Dispose();
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_disposed = true;
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}
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GC.SuppressFinalize (this);
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}
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}
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public static class VFS
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{
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private static FileSystemStack m_vfs = new FileSystemStack();
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/// <summary>
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/// Top, or "current" filesystem in VFS hierarchy.
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/// </summary>
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public static IFileSystem Top { get { return m_vfs.Top; } }
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/// <summary>
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/// Whether top filesystem is virtual (i.e. represents an archive).
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/// </summary>
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public static bool IsVirtual { get { return m_vfs.Count > 1; } }
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/// <summary>
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/// Number of filesystems in hierarchy. ==1 when only physical file system is represented.
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/// Always >= 1
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/// </summary>
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public static int Count { get { return m_vfs.Count; } }
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/// <summary>
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/// Archive corresponding to the top filesystem, or null if file system doesn't have underlying
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/// archive file.
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/// </summary>
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public static ArcFile CurrentArchive { get { return m_vfs.CurrentArchive; } }
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private static string[] m_top_path = new string[1];
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public static IEnumerable<string> FullPath
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{
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get
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{
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m_top_path[0] = Top.CurrentDirectory;
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if (1 == Count)
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return m_top_path;
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else
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return m_vfs.ArcStack.Reverse().Concat (m_top_path);
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}
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set
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{
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if (!value.Any())
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return;
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var desired = value.ToArray();
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if (desired.Length == Count)
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{
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var cur_stack = m_vfs.ArcStack.Reverse();
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if (1 == Count || cur_stack.SequenceEqual (desired.Take (desired.Length-1)))
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{
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// desired path is identical to current, adjust final component only
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m_vfs.Top.CurrentDirectory = desired.Last();
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return;
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}
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}
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// desired path is different, rebuild filesystem hierarchy from scratch
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var new_vfs = new FileSystemStack();
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try
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{
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for (int i = 0; i < desired.Length-1; ++i)
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new_vfs.ChDir (new_vfs.Top.FindFile (desired[i]));
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new_vfs.Top.CurrentDirectory = desired.Last();
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m_vfs.Dispose();
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}
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catch
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{
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new_vfs.Dispose();
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throw;
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}
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m_vfs = new_vfs;
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}
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}
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public static string CombinePath (string path1, string path2)
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{
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return m_vfs.Top.CombinePath (path1, path2);
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}
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public static Entry FindFile (string filename)
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{
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if (".." == filename)
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return new SubDirEntry ("..");
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return m_vfs.Top.FindFile (filename);
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}
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public static bool FileExists (string filename)
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{
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return m_vfs.Top.FileExists (filename);
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}
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public static Stream OpenStream (Entry entry)
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{
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return m_vfs.Top.OpenStream (entry);
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}
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public static Stream OpenSeekableStream (Entry entry)
|
|
{
|
|
return m_vfs.Top.OpenSeekableStream (entry);
|
|
}
|
|
|
|
public static ArcView OpenView (Entry entry)
|
|
{
|
|
return m_vfs.Top.OpenView (entry);
|
|
}
|
|
|
|
public static Stream OpenStream (string filename)
|
|
{
|
|
return m_vfs.Top.OpenStream (m_vfs.Top.FindFile (filename));
|
|
}
|
|
|
|
public static Stream OpenSeekableStream (string filename)
|
|
{
|
|
return m_vfs.Top.OpenSeekableStream (m_vfs.Top.FindFile (filename));
|
|
}
|
|
|
|
public static ArcView OpenView (string filename)
|
|
{
|
|
return m_vfs.Top.OpenView (m_vfs.Top.FindFile (filename));
|
|
}
|
|
|
|
public static void ChDir (Entry entry)
|
|
{
|
|
m_vfs.ChDir (entry);
|
|
}
|
|
|
|
public static void ChDir (string path)
|
|
{
|
|
m_vfs.ChDir (FindFile (path));
|
|
}
|
|
|
|
public static void Flush ()
|
|
{
|
|
m_vfs.Flush();
|
|
}
|
|
|
|
public static IEnumerable<Entry> GetFiles ()
|
|
{
|
|
return m_vfs.Top.GetFiles();
|
|
}
|
|
}
|
|
|
|
public class UnknownFormatException : FileFormatException
|
|
{
|
|
public UnknownFormatException () : base (garStrings.MsgUnknownFormat) { }
|
|
}
|
|
}
|