a4bb58007f
These implementations are often backed by a Dictionary, and tend to live a long time after being loaded. Ensure TrimExcess is called on the backing dictionaries to reduce the long term memory usage. In some cases, we can also preallocate the dictionary size for efficiency.
105 lines
2.3 KiB
C#
105 lines
2.3 KiB
C#
#region Copyright & License Information
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/*
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* Copyright (c) The OpenRA Developers and Contributors
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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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namespace OpenRA.Mods.D2k.PackageLoaders
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{
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public class D2kSoundResourcesLoader : IPackageLoader
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{
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sealed class D2kSoundResources : IReadOnlyPackage
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{
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readonly struct Entry
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{
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public readonly uint Offset;
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public readonly uint Length;
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public Entry(uint offset, uint length)
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{
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Offset = offset;
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Length = length;
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}
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}
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public string Name { get; }
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public IEnumerable<string> Contents => index.Keys;
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readonly Stream s;
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readonly Dictionary<string, Entry> index = new();
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public D2kSoundResources(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 headerLength = s.ReadUInt32();
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while (s.Position < headerLength + 4)
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{
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var name = s.ReadASCIIZ();
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var offset = s.ReadUInt32();
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var length = s.ReadUInt32();
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index.Add(name, new Entry(offset, length));
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}
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index.TrimExcess();
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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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public Stream GetStream(string filename)
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{
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if (!index.TryGetValue(filename, out var e))
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return null;
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return SegmentStream.CreateWithoutOwningStream(s, e.Offset, (int)e.Length);
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}
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public IReadOnlyPackage OpenPackage(string filename, FileSystem.FileSystem 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 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 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, FileSystem.FileSystem context, out IReadOnlyPackage package)
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{
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if (!filename.EndsWith(".rs", StringComparison.InvariantCultureIgnoreCase))
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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 D2kSoundResources(s, filename);
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return true;
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}
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}
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}
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