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22 lines
602 B
C++
22 lines
602 B
C++
//Module name: crc32
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//Author: Alcaro
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//Date: June 3, 2015
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//Licence: GPL v3.0 or higher
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#include "crc32.h"
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static const uint32_t crctable_4bits[]={
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0x00000000, 0x1DB71064, 0x3B6E20C8, 0x26D930AC, 0x76DC4190, 0x6B6B51F4, 0x4DB26158, 0x5005713C,
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0xEDB88320, 0xF00F9344, 0xD6D6A3E8, 0xCB61B38C, 0x9B64C2B0, 0x86D3D2D4, 0xA00AE278, 0xBDBDF21C,
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};
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uint32_t crc32_update(const uint8_t* data, size_t len, uint32_t crc)
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{
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crc = ~crc;
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for (size_t i=0;i<len;i++)
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{
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crc = crctable_4bits[(crc^ data[i] )&0x0F] ^ (crc>>4);
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crc = crctable_4bits[(crc^(data[i]>>4))&0x0F] ^ (crc>>4);
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}
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return ~crc;
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}
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