33 lines
715 B
C
Executable File
33 lines
715 B
C
Executable File
#ifndef CRC32_H
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#define CRC32_H
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#include <stdint.h>
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inline uint32_t crc32_core(uint32_t* ptr, uint32_t len){
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uint32_t xbit = 0;
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uint32_t data = 0;
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uint32_t CRC32 = 0xFFFFFFFF;
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const uint32_t dwPolynomial = 0x04c11db7;
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for (uint32_t i = 0; i < len; i++)
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{
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xbit = 1 << 31;
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data = ptr[i];
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for (uint32_t bits = 0; bits < 32; bits++)
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{
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if (CRC32 & 0x80000000)
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{
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CRC32 <<= 1;
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CRC32 ^= dwPolynomial;
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}
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else
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CRC32 <<= 1;
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if (data & xbit)
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CRC32 ^= dwPolynomial;
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xbit >>= 1;
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}
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}
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return CRC32;
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}
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#endif // CRC32_H
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