diff options
Diffstat (limited to 'src/lib')
| -rw-r--r-- | src/lib/crc_byte.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/lib/crc_byte.c b/src/lib/crc_byte.c index 0ac006363a..c04449d13f 100644 --- a/src/lib/crc_byte.c +++ b/src/lib/crc_byte.c @@ -36,3 +36,17 @@ uint16_t crc16_byte(uint16_t prev_crc, uint8_t data) prev_crc ^= ((prev_crc & 0xff) << 4) << 1; return prev_crc; } + +uint32_t crc32_byte(uint32_t prev_crc, uint8_t data) +{ + prev_crc ^= (uint32_t)data << 24; + + for (int i = 0; i < 8; i++) { + if ((prev_crc & 0x80000000UL) != 0) + prev_crc = ((prev_crc << 1) ^ 0x04C11DB7UL); + else + prev_crc <<= 1; + } + + return prev_crc; +} |