12.1. crc
— Cyclic Redundancy Checks¶
Source code: src/hash/crc.h, src/hash/crc.c
Test code: tst/hash/crc/main.c
Test coverage: src/hash/crc.c
Functions
-
uint32_t
crc_32
(uint32_t crc, const void *buf_p, size_t size)¶
-
uint16_t
crc_ccitt
(uint16_t crc, const void *buf_p, size_t size)¶ Calculate a 16 bits crc using the CCITT algorithm (polynomial
x^16+x^12+x^5+x^1
).- Return
- Calculated crc.
- Parameters
crc
: Initial crc. Should be 0xffff for CCITT.buf_p
: Buffer to calculate crc of.size
: Size of the buffer.
-
uint16_t
crc_xmodem
(uint16_t crc, const void *buf_p, size_t size)¶ Calculate a 16 bits crc using the XModem algorithm (polynomial
x^16+x^12+x^5+x^1
).- Return
- Calculated crc.
- Parameters
crc
: Initial crc. Should be 0x0000 for XModem.buf_p
: Buffer to calculate crc of.size
: Size of the buffer.
-
uint8_t
crc_7
(const void *buf_p, size_t size)¶ Calculate a 8 bits crc using the CRC-7 algorithm (polynomial
x^7+x^3+1
).- Return
- Calculated crc.
- Parameters
buf_p
: Buffer to calculate crc of.size
: Size of the buffer.