27 lines
452 B
C
27 lines
452 B
C
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/*
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* Copyright (c) 2018 Workaround GmbH.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <crc32.h>
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u32_t crc32_ieee(const u8_t *data, size_t len)
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{
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return crc32_ieee_update(0x0, data, len);
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}
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u32_t crc32_ieee_update(u32_t crc, const u8_t *data, size_t len)
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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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crc = crc ^ data[i];
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for (u8_t j = 0; j < 8; j++) {
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crc = (crc >> 1) ^ (0xEDB88320 & -(crc & 1));
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}
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}
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return (~crc);
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}
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