87a5e4cd2d
Squashed commit of the following:
Author: Gregory Nutt <gnutt@nuttx.org>
fs/littlefs: Fix some compilation errors.
fs/littlefs: Brings code a little closer to NuttX coding standard. Not 100%, but closer.
fs/littlefs: Convert all C++ style comments to C comments.
Author: lihaichen <li8303@163.com>
fs/littlefs: Adds port of the mbed littlefs.
depends on !DISABLE_MOUNTPOINT && MTD_BYTE_WRITE
register_mtddriver("/dev/w25", mtd, 0755, NULL);
mount("/dev/w25", "/w25", "littlefs", 0, NULL);
84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
/****************************************************************************
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* fs/littlefs/lfs_util.c
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*
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* This file is a part of NuttX:
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*
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* Copyright (C) 2019 Gregory Nutt. All rights reserved.
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*
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* Ported by:
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*
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* Copyright (C) 2019 Pinecone Inc. All rights reserved.
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* Author: lihaichen <li8303@163.com>
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*
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* This port derives from ARM mbed logic which has a compatible 3-clause
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* BSD license:
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*
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* Copyright (c) 2017, Arm Limited. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include "lfs.h"
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#include "lfs_util.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/* Only compile if user does not provide custom config */
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#ifndef LFS_CONFIG
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/* Software CRC implementation with small lookup table */
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void lfs_crc(FAR uint32_t *restrict crc, FAR const void *buffer, size_t size)
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{
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static const uint32_t rtable[16] =
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{
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0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190, 0x6b6b51f4,
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0x4db26158, 0x5005713c, 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
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0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c,
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};
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FAR const uint8_t *data = buffer;
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size_t i;
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for (i = 0; i < size; i++)
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{
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*crc = (*crc >> 4) ^ rtable[(*crc ^ (data[i] >> 0)) & 0xf];
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*crc = (*crc >> 4) ^ rtable[(*crc ^ (data[i] >> 4)) & 0xf];
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}
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}
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#endif
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