124 lines
2.7 KiB
C#
124 lines
2.7 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2020 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, either version 3 of
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* the License, or (at your option) any later version. For more
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* information, 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 OpenRA.FileSystem;
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using OpenRA.Primitives;
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using FS = OpenRA.FileSystem.FileSystem;
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namespace OpenRA.Mods.Cnc.FileSystem
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{
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public class BigLoader : IPackageLoader
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{
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sealed class BigFile : IReadOnlyPackage
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{
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public string Name { get; private set; }
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public IEnumerable<string> Contents { get { return index.Keys; } }
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readonly Dictionary<string, Entry> index = new Dictionary<string, Entry>();
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readonly Stream s;
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public BigFile(Stream s, string filename)
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{
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Name = filename;
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this.s = s;
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try
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{
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/* var signature = */ s.ReadASCII(4);
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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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index.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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public readonly uint Offset;
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public 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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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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}
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public Stream GetStream(string filename)
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{
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var entry = index[filename];
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return SegmentStream.CreateWithoutOwningStream(s, entry.Offset, (int)entry.Size);
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}
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public bool Contains(string filename)
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{
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return index.ContainsKey(filename);
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}
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public IReadOnlyPackage OpenPackage(string filename, FS context)
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{
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// Not implemented
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return null;
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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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bool IPackageLoader.TryParsePackage(Stream s, string filename, FS context, out IReadOnlyPackage package)
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{
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// Take a peek at the file signature
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var signature = s.ReadASCII(4);
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s.Position -= 4;
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if (signature != "BIGF")
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{
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package = null;
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return false;
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}
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package = new BigFile(s, filename);
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return true;
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}
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}
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}
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