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| author | Harald Welte <laforge@gnumonks.org> | 2016-12-23 22:16:08 +0100 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2016-12-23 22:16:08 +0100 |
| commit | a0f74f218bd5c805d1c190af54d80ed781241148 (patch) | |
| tree | 6dce29c5ab8f66742b8f0a2b2226943e08bcfb50 /include | |
| parent | 5e5954db8b2f340a10877ebabc895f27ad319231 (diff) | |
add CRC16-CCITT to libosmocore
Use the implementation from Linux lib/crc-ccitt.c (GPLv2)
Change-Id: I26bb54038f5ab36bbb34da7f5fb8ae6c0c0386a4
Diffstat (limited to 'include')
| -rw-r--r-- | include/osmocom/core/crc16.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/osmocom/core/crc16.h b/include/osmocom/core/crc16.h index 83b2e5f7..f1564bd2 100644 --- a/include/osmocom/core/crc16.h +++ b/include/osmocom/core/crc16.h @@ -29,3 +29,15 @@ static inline uint16_t osmo_crc16_byte(uint16_t crc, const uint8_t data) { return (crc >> 8) ^ osmo_crc16_table[(crc ^ data) & 0xff]; } + + +/* CCITT polynome 0x8408. This corresponds to x^0 + x^5 + x^12 */ + +extern uint16_t const osmo_crc16_ccitt_table[256]; + +extern uint16_t osmo_crc16_ccitt(uint16_t crc, const uint8_t *buffer, size_t len); + +static inline uint16_t osmo_crc16_ccitt_byte(uint16_t crc, const uint8_t data) +{ + return (crc >> 8) ^ osmo_crc16_ccitt_table[(crc ^ data) & 0xff]; +} |