misc/libphysfs/lzma/CS/7zip/Common/CRC.cs
author Wuzzy <almikes@aol.com>
Sat, 15 Apr 2017 23:21:13 +0200
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permissions -rw-r--r--
Add two main menu tips regarding mission panel
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// Common/CRC.cs
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namespace SevenZip
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{
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	class CRC
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	{
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		public static readonly uint[] Table;
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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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		uint _value = 0xFFFFFFFF;
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		public void Init() { _value = 0xFFFFFFFF; }
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		public void UpdateByte(byte b)
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		{
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			_value = Table[(((byte)(_value)) ^ b)] ^ (_value >> 8);
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		}
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		public void Update(byte[] data, uint offset, uint size)
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		{
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			for (uint i = 0; i < size; i++)
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				_value = Table[(((byte)(_value)) ^ data[offset + i])] ^ (_value >> 8);
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		}
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		public uint GetDigest() { return _value ^ 0xFFFFFFFF; }
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		static uint CalculateDigest(byte[] data, uint offset, uint size)
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		{
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			CRC crc = new CRC();
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			// crc.Init();
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			crc.Update(data, offset, size);
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			return crc.GetDigest();
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		}
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		static bool VerifyDigest(uint digest, byte[] data, uint offset, uint size)
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		{
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			return (CalculateDigest(data, offset, size) == digest);
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		}
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	}
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}