51 lines
843 B
C++
51 lines
843 B
C++
#pragma once
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#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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typedef uint32_t strhash;
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[[maybe_unused]] static strhash CRC32B(unsigned char* message, int32_t size)
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{
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int32_t byte = 0, crc = 0;
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int32_t mask = 0;
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crc = 0xFFFFFFFF;
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for (int32_t i = 0; i < size; i++)
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{
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byte = message[i];
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crc = crc ^ byte;
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for (int32_t j = 7; j >= 0; j--)
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{
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mask = -(crc & 1);
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crc = (crc >> 1) ^ (0xEDB88320 & mask);
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}
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}
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return ~(uint32_t)(crc);
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}
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[[maybe_unused]] constexpr static strhash CRC32BCT(const char* message, int32_t size)
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{
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int32_t byte = 0, crc = 0;
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int32_t mask = 0;
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crc = 0xFFFFFFFF;
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for (int32_t i = 0; i < size; i++)
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{
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byte = message[i];
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crc = crc ^ byte;
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for (int32_t j = 7; j >= 0; j--)
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{
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mask = -(crc & 1);
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crc = (crc >> 1) ^ (0xEDB88320 & mask);
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}
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}
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return ~(uint32_t)(crc);
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} |