59 lines
1.2 KiB
C#
59 lines
1.2 KiB
C#
using System.Text;
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namespace CafeLibrary.M2
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{
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class CRC32Hash
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{
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private static uint[] Table = new uint[256];
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private static bool IsInitialized = false;
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public static void Initialize()
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{
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uint Polynomial = 0xedb88320;
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for (uint Value, i = 0; i < Table.Length; i++)
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{
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Value = i;
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for (int j = 8; j > 0; --j)
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{
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Value = (Value >> 1) ^ (Polynomial * (Value & 1));
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}
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Table[i] = Value;
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}
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IsInitialized = true;
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}
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public static uint Hash(byte[] Data)
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{
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if (!IsInitialized) Initialize();
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uint CRC = 0xffffffff;
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for (int i = 0; i < Data.Length; i++)
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{
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CRC = (CRC >> 8) ^ Table[(CRC & 0xff) ^ Data[i]];
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}
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return CRC;
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}
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public static uint Hash(string Text)
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{
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return Hash(Encoding.ASCII.GetBytes(Text));
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}
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public static uint HashNegated(byte[] Data)
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{
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return ~Hash(Data);
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}
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public static uint HashNegated(string Text)
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{
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return ~Hash(Text);
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}
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}
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} |