diff options
Diffstat (limited to '')
-rw-r--r-- | include/linux/crc-ccitt.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/crc-ccitt.h b/include/linux/crc-ccitt.h new file mode 100644 index 000000000..72c92c396 --- /dev/null +++ b/include/linux/crc-ccitt.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_CRC_CCITT_H +#define _LINUX_CRC_CCITT_H + +#include <linux/types.h> + +extern u16 const crc_ccitt_table[256]; +extern u16 const crc_ccitt_false_table[256]; + +extern u16 crc_ccitt(u16 crc, const u8 *buffer, size_t len); +extern u16 crc_ccitt_false(u16 crc, const u8 *buffer, size_t len); + +static inline u16 crc_ccitt_byte(u16 crc, const u8 c) +{ + return (crc >> 8) ^ crc_ccitt_table[(crc ^ c) & 0xff]; +} + +static inline u16 crc_ccitt_false_byte(u16 crc, const u8 c) +{ + return (crc << 8) ^ crc_ccitt_false_table[(crc >> 8) ^ c]; +} + +#endif /* _LINUX_CRC_CCITT_H */ |