mirror of
https://github.com/firestar5683/StarPilot.git
synced 2026-11-06 20:43:46 +08:00
Daniel Koepping
27 lines
651 B
C
27 lines
651 B
C
#pragma once
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// standard CRC-32, same as zlib's crc32()
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static uint32_t crc32_table[256];
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void crc32_init(void) {
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for (uint32_t i = 0U; i < 256U; i++) {
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uint32_t c = i;
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for (uint8_t j = 0U; j < 8U; j++) {
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c = ((c & 1U) != 0U) ? (0xEDB88320U ^ (c >> 1U)) : (c >> 1U);
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}
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crc32_table[i] = c;
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}
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}
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uint32_t crc32_update(uint32_t crc, const uint8_t *dat, uint32_t len) {
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uint32_t ret = crc;
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for (uint32_t i = 0U; i < len; i++) {
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ret = crc32_table[(ret ^ dat[i]) & 0xFFU] ^ (ret >> 8U);
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}
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return ret;
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}
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uint32_t crc32(const uint8_t *dat, uint32_t len) {
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return crc32_update(0xFFFFFFFFU, dat, len) ^ 0xFFFFFFFFU;
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}
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