34 lines
744 B
C++
34 lines
744 B
C++
#include <stdio.h>
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#include <ctype.h>
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#include "tinycrc.h"
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/*
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CRC32
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*/
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uint32_t tinycrc_crc32(const uint8_t* data, uint16_t size)
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{
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const unsigned long crc_table[16] = {
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0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
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0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
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0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
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0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
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};
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if (data == nullptr) {
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return 0;
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}
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unsigned long crc = ~0L;
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for (int index = 0 ; index < size ; ++index) {
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crc = crc_table[(crc ^ data[index]) & 0x0f] ^ (crc >> 4);
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crc = crc_table[(crc ^ (data[index] >> 4)) & 0x0f] ^ (crc >> 4);
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crc = ~crc;
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}
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return crc & 0xFFFFFFFF;
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};
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