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PackageEntry.cs
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PackageEntry.cs
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#region Copyright & License Information
/*
* Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
* This file is part of OpenRA, which is free software. It is made
* available to you under the terms of the GNU General Public License
* as published by the Free Software Foundation. For more information,
* see LICENSE.
*/
#endregion
using System.Collections.Generic;
using System.IO;
using System.Text;
namespace OpenRA.FileFormats
{
public class PackageEntry
{
public readonly uint Hash;
public readonly uint Offset;
public readonly uint Length;
public PackageEntry(uint hash, uint offset, uint length)
{
Hash = hash;
Offset = offset;
Length = length;
}
public PackageEntry(BinaryReader r)
{
Hash = r.ReadUInt32();
Offset = r.ReadUInt32();
Length = r.ReadUInt32();
}
public void Write(BinaryWriter w)
{
w.Write(Hash);
w.Write(Offset);
w.Write(Length);
}
public override string ToString()
{
string filename;
if (Names.TryGetValue(Hash, out filename))
return string.Format("{0} - offset 0x{1:x8} - length 0x{2:x8}", filename, Offset, Length);
else
return string.Format("0x{0:x8} - offset 0x{1:x8} - length 0x{2:x8}", Hash, Offset, Length);
}
public static uint HashFilename(string name)
{
if (name.Length > 12)
name = name.Substring(0, 12);
name = name.ToUpperInvariant();
if (name.Length % 4 != 0)
name = name.PadRight(name.Length + (4 - name.Length % 4), '\0');
MemoryStream ms = new MemoryStream(Encoding.ASCII.GetBytes(name));
BinaryReader reader = new BinaryReader(ms);
int len = name.Length >> 2;
uint result = 0;
while (len-- != 0)
result = ((result << 1) | (result >> 31)) + reader.ReadUInt32();
return result;
}
static Dictionary<uint, string> Names = new Dictionary<uint,string>();
public static void AddStandardName(string s)
{
uint hash = HashFilename(s);
Names.Add(hash, s);
}
public const int Size = 12;
}
}