diff options
Diffstat (limited to 'firmware/include')
| -rw-r--r-- | firmware/include/checksum.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/firmware/include/checksum.h b/firmware/include/checksum.h new file mode 100644 index 0000000000..6e66368bcf --- /dev/null +++ b/firmware/include/checksum.h @@ -0,0 +1,41 @@ +/*************************************************************************** + * __________ __ ___. + * 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 |