124 lines
2.6 KiB
C#
124 lines
2.6 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see COPYING.
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*/
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#endregion
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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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namespace OpenRA.FileSystem
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{
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public sealed class BigFile : IFolder
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{
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public string Name { get; private set; }
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public int Priority { get; private set; }
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readonly Dictionary<string, Entry> entries = new Dictionary<string, Entry>();
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readonly Stream s;
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public BigFile(FileSystem context, string filename, int priority)
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{
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Name = filename;
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Priority = priority;
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s = context.Open(filename);
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try
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{
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if (s.ReadASCII(4) != "BIGF")
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throw new InvalidDataException("Header is not BIGF");
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// Total archive size.
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s.ReadUInt32();
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var entryCount = s.ReadUInt32();
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if (BitConverter.IsLittleEndian)
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entryCount = int2.Swap(entryCount);
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// First entry offset? This is apparently bogus for EA's .big files
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// and we don't have to try seeking there since the entries typically start next in EA's .big files.
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s.ReadUInt32();
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for (var i = 0; i < entryCount; i++)
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{
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var entry = new Entry(s);
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entries.Add(entry.Path, entry);
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}
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}
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catch
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{
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Dispose();
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throw;
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}
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}
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class Entry
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{
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readonly Stream s;
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readonly uint offset;
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readonly uint size;
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public readonly string Path;
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public Entry(Stream s)
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{
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this.s = s;
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offset = s.ReadUInt32();
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size = s.ReadUInt32();
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if (BitConverter.IsLittleEndian)
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{
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offset = int2.Swap(offset);
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size = int2.Swap(size);
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}
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Path = s.ReadASCIIZ();
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}
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public Stream GetData()
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{
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s.Position = offset;
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return new MemoryStream(s.ReadBytes((int)size));
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}
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}
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public Stream GetContent(string filename)
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{
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return entries[filename].GetData();
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}
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public bool Exists(string filename)
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{
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return entries.ContainsKey(filename);
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}
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public IEnumerable<uint> ClassicHashes()
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{
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return entries.Keys.Select(filename => PackageEntry.HashFilename(filename, PackageHashType.Classic));
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}
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public IEnumerable<uint> CrcHashes()
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{
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return Enumerable.Empty<uint>();
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}
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public IEnumerable<string> AllFileNames()
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{
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return entries.Keys;
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}
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public void Write(Dictionary<string, byte[]> contents)
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{
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throw new NotImplementedException();
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}
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public void Dispose()
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{
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s.Dispose();
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}
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}
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} |