42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2020 James Buren
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdint.h>
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#include <stdbool.h>
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#ifndef _CHECKSUM_H
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#define _CHECKSUM_H
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/* rockbox firmware checksum algorithm */
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static inline uint32_t calc_checksum(uint32_t sum, const uint8_t* buf, size_t len)
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{
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for (size_t i = 0; i < len; i++)
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sum += buf[i];
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return sum;
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}
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/* similar to above but only used for verification */
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static inline bool verify_checksum(uint32_t cs, const uint8_t* buf, size_t len)
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{
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return (calc_checksum(MODEL_NUMBER, buf, len) == cs);
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}
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#endif
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