111 lines
2.6 KiB
C#
111 lines
2.6 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 System.Text;
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using OpenRA.Mods.Cnc.FileFormats;
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namespace OpenRA.Mods.Cnc.FileSystem
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{
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public enum PackageHashType { Classic, CRC32 }
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public class PackageEntry
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{
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public const int Size = 12;
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public readonly uint Hash;
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public readonly uint Offset;
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public readonly uint Length;
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public PackageEntry(uint hash, uint offset, uint length)
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{
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Hash = hash;
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Offset = offset;
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Length = length;
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}
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public PackageEntry(Stream s)
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{
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Hash = s.ReadUInt32();
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Offset = s.ReadUInt32();
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Length = s.ReadUInt32();
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}
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public void Write(BinaryWriter w)
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{
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w.Write(Hash);
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w.Write(Offset);
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w.Write(Length);
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}
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public override string ToString()
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{
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if (names.TryGetValue(Hash, out var filename))
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return "{0} - offset 0x{1:x8} - length 0x{2:x8}".F(filename, Offset, Length);
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else
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return "0x{0:x8} - offset 0x{1:x8} - length 0x{2:x8}".F(Hash, Offset, Length);
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}
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public static uint HashFilename(string name, PackageHashType type)
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{
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switch (type)
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{
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case PackageHashType.Classic:
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{
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name = name.ToUpperInvariant();
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if (name.Length % 4 != 0)
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name = name.PadRight(name.Length + (4 - name.Length % 4), '\0');
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using (var ms = new MemoryStream(Encoding.ASCII.GetBytes(name)))
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{
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var len = name.Length >> 2;
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uint result = 0;
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while (len-- != 0)
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result = ((result << 1) | (result >> 31)) + ms.ReadUInt32();
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return result;
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}
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}
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case PackageHashType.CRC32:
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{
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name = name.ToUpperInvariant();
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var l = name.Length;
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var a = l >> 2;
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if ((l & 3) != 0)
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{
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name += (char)(l - (a << 2));
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var i = 3 - (l & 3);
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while (i-- != 0)
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name += name[a << 2];
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}
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return CRC32.Calculate(Encoding.ASCII.GetBytes(name));
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}
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default: throw new NotImplementedException("Unknown hash type `{0}`".F(type));
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}
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}
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static Dictionary<uint, string> names = new Dictionary<uint, string>();
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public static void AddStandardName(string s)
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{
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var hash = HashFilename(s, PackageHashType.Classic); // RA1 and TD
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names.Add(hash, s);
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var crcHash = HashFilename(s, PackageHashType.CRC32); // TS
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names.Add(crcHash, s);
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}
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}
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}
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