StrHash64.h File Reference

#include <stdint.h>

Include dependency graph for StrHash64.h:

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Macros
#define	INITIAL_CRC64   0xffffffffffffffffULL
	Initial CRC64 seed value. Pass to update_crc64() as the starting crc.

Functions
uint64_t	update_crc64 (const void *buf, uint32_t len, uint64_t crc)
	Updates a running CRC64 checksum with len bytes from buf.
uint64_t	crc64 (const void *buf, uint32_t len)
	Computes the CRC64 of len bytes starting at buf.
uint64_t	CRC64 (const char *t)
	Computes the CRC64 of a null-terminated string t.

Macro Definition Documentation

INITIAL_CRC64

#define INITIAL_CRC64   0xffffffffffffffffULL

Initial CRC64 seed value. Pass to update_crc64() as the starting crc.

Function Documentation

CRC64()

uint64_t CRC64 ( const char *  t )

extern

Computes the CRC64 of a null-terminated string t.

This is the primary hashing function used by the resource system to map virtual resource paths (char*) to their 64-bit CRC identifiers.

Parameters

t	Null-terminated string to hash.

Returns

64-bit CRC hash of t (excluding the null terminator).

crc64()

uint64_t crc64 ( const void *  buf, uint32_t  len  )

extern

Computes the CRC64 of len bytes starting at buf.

Equivalent to calling update_crc64() once with INITIAL_CRC64 as the seed.

Parameters

buf	Pointer to the data to hash.
len	Number of bytes in buf.

Returns

64-bit CRC hash of the input.

update_crc64()

uint64_t update_crc64 ( const void *  buf, uint32_t  len, uint64_t  crc  )

extern

Updates a running CRC64 checksum with len bytes from buf.

Use this function to compute the CRC64 of a multi-part message by chaining calls:

uint64_t crc = INITIAL_CRC64;
crc = update_crc64(part1, len1, crc);
crc = update_crc64(part2, len2, crc);

Parameters

buf	Pointer to the data to hash.
len	Number of bytes in buf.
crc	Running CRC64 value (initialise with INITIAL_CRC64).

Returns

Updated CRC64 value.