misc/libphysfs/lzma/Java/SevenZip/CRC.java
author nemo
Wed, 09 Aug 2017 12:22:05 -0400
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parent 12218 bb5522e88ab2
permissions -rw-r--r--
don't spawn things on ice. it's too unpredictable what'll happen to them
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// SevenZip/CRC.java
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package SevenZip;
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public class CRC
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{
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	static public int[] Table = new int[256];
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	static
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	{
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		for (int i = 0; i < 256; i++)
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		{
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			int 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) ^ 0xEDB88320;
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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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	int _value = -1;
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	public void Init()
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	{
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		_value = -1;
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	}
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	public void Update(byte[] data, int offset, int size)
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	{
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		for (int i = 0; i < size; i++)
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			_value = Table[(_value ^ data[offset + i]) & 0xFF] ^ (_value >>> 8);
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	}
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	public void Update(byte[] data)
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	{
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		int size = data.length;
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		for (int i = 0; i < size; i++)
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			_value = Table[(_value ^ data[i]) & 0xFF] ^ (_value >>> 8);
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	}
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	public void UpdateByte(int b)
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	{
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		_value = Table[(_value ^ b) & 0xFF] ^ (_value >>> 8);
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	}
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	public int GetDigest()
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	{
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		return _value ^ (-1);
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	}
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}