54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/*
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* This file is part of the EasyFlash Library.
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*
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* Copyright (c) 2015-2017, Armink, <armink.ztl@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* 'Software'), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Function: Some utils for this library.
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* Created on: 2015-01-14
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*/
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#include <easyflash.h>
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extern uint32_t om_crc32_tab[];
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/**
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* Calculate the CRC32 value of a memory buffer.
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*
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* @param crc accumulated CRC32 value, must be 0 on first call
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* @param buf buffer to calculate CRC32 value for
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* @param size bytes in buffer
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*
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* @return calculated CRC32 value
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*/
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uint32_t ef_calc_crc32(uint32_t crc, const void *buf, size_t size) {
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const uint8_t *p;
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p = (const uint8_t *)buf;
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crc = crc ^ ~0U;
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while (size--) {
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crc = om_crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
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}
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return crc ^ ~0U;
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}
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