mirror of
https://git.do.srb2.org/STJr/UltimateZoneBuilder.git
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109 lines
2.6 KiB
C#
109 lines
2.6 KiB
C#
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#region ================== Copyright (c) 2007 Pascal vd Heiden
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/*
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* Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
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* This program is released under GNU General Public License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#endregion
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#region ================== Namespaces
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Text;
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using System.Runtime.InteropServices;
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using System.Diagnostics;
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#endregion
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namespace CodeImp.DoomBuilder
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{
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public class CRC
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{
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#region ================== Constants
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private static readonly uint[] Table;
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#endregion
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#region ================== Variables
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private uint _value = 0xFFFFFFFF;
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#endregion
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#region ================== Properties
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public long Value { get { return _value ^ 0xFFFFFFFF; } }
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#endregion
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#region ================== Constructor / Disposer
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// Constructor
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public CRC()
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{
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// We have no destructor
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GC.SuppressFinalize(this);
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}
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static CRC()
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{
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Table = new uint[256];
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const uint kPoly = 0xEDB88320;
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for (uint i = 0; i < 256; i++)
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{
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uint r = i;
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for (int j = 0; j < 8; j++)
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if ((r & 1) != 0)
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r = (r >> 1) ^ kPoly;
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else
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r >>= 1;
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Table[i] = r;
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}
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}
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#endregion
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#region ================== Methods
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public void Add(long value)
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{
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uint lo = (uint)((ulong)value & 0x00000000FFFFFFFF);
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uint hi = (uint)(((ulong)value & 0xFFFFFFFF00000000) >> 32);
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Add(unchecked((int)lo));
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Add(unchecked((int)hi));
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}
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public void Add(int value)
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{
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_value = Table[(((byte)(_value)) ^ (value & 0xFF))] ^ (_value >> 8);
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_value = Table[(((byte)(_value)) ^ ((value >> 8) & 0xFF))] ^ (_value >> 8);
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_value = Table[(((byte)(_value)) ^ ((value >> 16) & 0xFF))] ^ (_value >> 8);
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_value = Table[(((byte)(_value)) ^ ((value >> 24) & 0xFF))] ^ (_value >> 8);
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}
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public void Add(byte[] data)
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{
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for (uint i = 0; i < data.Length; i++)
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_value = Table[(((byte)(_value)) ^ data[i])] ^ (_value >> 8);
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}
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public void Reset()
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{
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_value = 0xFFFFFFFF;
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}
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#endregion
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}
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}
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