#include <nitro/math/crc.h>
static inline u8 MATH_CRC8GetHash( MATHCRC8Context *context );
static inline u16 MATH_CRC16GetHash( MATHCRC16Context *context );
static inline u16 MATH_CRC16CCITTGetHash( MATHCRC16Context *context );
static inline u32 MATH_CRC32GetHash( MATHCRC32Context *context );
static inline u32 MATH_CRC32POSIXGetHash( MATHCRC32Context *context );
context |
Pointer to the context structure for CRC* generation. |
None.
Obtains the hash value based on various CRCs. You must first initialize the 'context' argument using MATH_CRC*Init
and then provide the input data using MATH_CRC*Update
.
CRC-8 is an algorithm that finds an 8-bit hash value.
CRC-16 and CRC-16/CCITT are algorithms that find 16-bit hash values.
CRC-32 and CRC-32/POSIX are algorithms that find 32-bit hash values. CRC-16 is the algorithm used in the ARC and LHA compression programs. One restriction is that the hash value does not change when a 0
byte is appended to the top. CRC-16/CCITT is an algorithm that is used in many data link layer standards as a FCS (Frame Check Sequence). It is defined in the x.25 standard of the CCITT (Comite Consultatif International Telegraphique et Telephonique). CRC-32 is an algorithm used in compression programs, such as PKZIP, and image formats, such as PNG. For details, see ISO 3309 and RFC 2083. CRC-32/POSIX is an algorithm used in the cksum command, which is included in POSIX-compliant Unix. It is defined in POSIX 1003.2. With the cksum
command, CRC is taken after the file length is appended to the end of the input file.
MATH_CRC*Init
, MATH_CRC*Update
04/12/2005 Initial version.