Kenji Arai / mbed-os_TYBLE16

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Dependents:   TYBLE16_simple_data_logger TYBLE16_MP3_Air

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Show/hide line numbers lfs_util.c Source File

lfs_util.c

00001 /*
00002  * lfs util functions
00003  *
00004  * Copyright (c) 2017, Arm Limited. All rights reserved.
00005  * SPDX-License-Identifier: BSD-3-Clause
00006  */
00007 #include "lfs_util.h"
00008 
00009 
00010 // Only compile if user does not provide custom config
00011 #ifndef LFS_CONFIG
00012 #ifndef __MBED__
00013 void lfs_crc(uint32_t *restrict crc, const void *buffer, size_t size) {
00014     static const uint32_t rtable[16] = {
00015         0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
00016         0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
00017         0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
00018         0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c,
00019     };
00020 
00021     const uint8_t *data = buffer;
00022     for (size_t i = 0; i < size; i++) {
00023         *crc = (*crc >> 4) ^ rtable[(*crc ^ (data[i] >> 0)) & 0xf];
00024         *crc = (*crc >> 4) ^ rtable[(*crc ^ (data[i] >> 4)) & 0xf];
00025     }
00026 }
00027 #endif
00028 #endif