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)¶ Calculate a 32 bits crc using the polynomial
x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0
.- Return
- Calculated crc.
- Parameters
crc
-Initial crc. Often 0x00000000.
buf_p
-Buffer to calculate crc of.
size
-Size of the buffer.
-
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.