HaloMods "Classic" Read-only Archive

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            FileStream fs = new FileStream((map.path,
                FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);

            BinaryReader br = new BinaryReader(fs);
            BinaryWriter bw = new BinaryWriter(fs);

            int sig = 0;
            long length = br.BaseStream.Length;

            br.BaseStream.Position = 2048;

            for (long i = 2048; i < length; i += 4)
                sig ^= br.ReadInt32();

            bw.BaseStream.Position = 720;
            bw.Write(sig);

            br.Close();
            bw.Close();