6b3b4df6f6
Before this was just implemented inline wherever it was needed. Now it is provided as 2 inline functions in a header called checksum.h. There should be no differences in actual behavior. Change-Id: I5d756cc01dc6225f5cc8b6af90911a3fc7b57cd5
41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2020 James Buren
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
|
|
#ifndef _CHECKSUM_H
|
|
#define _CHECKSUM_H
|
|
|
|
/* rockbox firmware checksum algorithm */
|
|
static inline uint32_t calc_checksum(uint32_t sum, const uint8_t* buf, size_t len)
|
|
{
|
|
for (size_t i = 0; i < len; i++)
|
|
sum += buf[i];
|
|
return sum;
|
|
}
|
|
|
|
/* similar to above but only used for verification */
|
|
static inline bool verify_checksum(uint32_t cs, const uint8_t* buf, size_t len)
|
|
{
|
|
return (calc_checksum(MODEL_NUMBER, buf, len) == cs);
|
|
}
|
|
|
|
#endif
|