36 lines
791 B
C#
36 lines
791 B
C#
namespace Monitor.Protocol;
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/// <summary>CRC-32C（Castagnoli），RawChunk 的完整性校验。</summary>
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public static class Crc32c
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{
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private static readonly uint[] s_table = BuildTable();
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public static uint Compute(ReadOnlySpan<byte> data)
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{
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uint crc = uint.MaxValue;
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foreach (byte b in data)
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{
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crc = s_table[(crc ^ b) & 0xFF] ^ (crc >> 8);
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}
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return ~crc;
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}
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private static uint[] BuildTable()
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{
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var table = new uint[256];
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for (uint i = 0; i < 256; i++)
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{
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uint c = i;
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for (int k = 0; k < 8; k++)
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{
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c = (c & 1) != 0 ? (c >> 1) ^ 0x82F63B78u : c >> 1;
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}
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table[i] = c;
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}
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return table;
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}
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}
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