119 lines
3.3 KiB
C#
119 lines
3.3 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 System.Runtime.InteropServices;
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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 $"{filename} - offset 0x{Offset:x8} - length 0x{Length:x8}";
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else
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return $"0x{Hash:x8} - offset 0x{Offset:x8} - length 0x{Length:x8}";
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}
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public static uint HashFilename(string name, PackageHashType type)
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{
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var padding = name.Length % 4 != 0 ? 4 - name.Length % 4 : 0;
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var paddedLength = name.Length + padding;
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// Avoid stack overflows by only allocating small buffers on the stack, and larger ones on the heap.
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// 64 chars covers most real filenames.
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var upperPaddedName = paddedLength < 64 ? stackalloc char[paddedLength] : new char[paddedLength];
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name.AsSpan().ToUpperInvariant(upperPaddedName);
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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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for (var p = 0; p < padding; p++)
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upperPaddedName[paddedLength - 1 - p] = '\0';
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var asciiBytes = paddedLength < 64 ? stackalloc byte[paddedLength] : new byte[paddedLength];
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Encoding.ASCII.GetBytes(upperPaddedName, asciiBytes);
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var data = MemoryMarshal.Cast<byte, uint>(asciiBytes);
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var result = 0u;
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foreach (var next in data)
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result = ((result << 1) | (result >> 31)) + next;
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return result;
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}
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case PackageHashType.CRC32:
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{
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var length = name.Length;
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var lengthRoundedDownToFour = length / 4 * 4;
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if (length != lengthRoundedDownToFour)
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{
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upperPaddedName[length] = (char)(length - lengthRoundedDownToFour);
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for (var p = 1; p < padding; p++)
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upperPaddedName[length + p] = upperPaddedName[lengthRoundedDownToFour];
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}
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var asciiBytes = paddedLength < 64 ? stackalloc byte[paddedLength] : new byte[paddedLength];
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Encoding.ASCII.GetBytes(upperPaddedName, asciiBytes);
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return CRC32.Calculate(asciiBytes);
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}
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default: throw new NotImplementedException($"Unknown hash type `{type}`");
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}
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}
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static readonly Dictionary<uint, string> Names = new();
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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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