Sdk hash api documentation

Hash functions.

Include:	#include <dmsdk/dlib/hash.h>

FUNCTIONS
uint64_t dmHashBuffer64(const void* buffer, uint32_t buffer_len)	calculate 64-bit hash value from buffer
uint64_t dmHashString64(const char* string)	calculate 64-bit hash value from string
const char* dmHashReverseSafe64(uint64_t hash)	get string value from hash
const char* dmHashReverseSafe64(uint64_t hash, uint32_t* length)	get string value from hash

Functions

dmHashBuffer64

uint64_t dmHashBuffer64(const void* buffer, uint32_t buffer_len)

calculate 64-bit hash value from buffer

PARAMETERS

const void*	buffer	Buffer
uint32_t	buffer_len	Length of buffer

RETURNS

uint64_t

hash value

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dmHashString64

uint64_t dmHashString64(const char* string)

calculate 64-bit hash value from string

PARAMETERS

const char*

string

Null terminated string

RETURNS

uint64_t

hash value

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dmHashReverseSafe64

const char* dmHashReverseSafe64(uint64_t hash)

Returns the original string used to produce a hash. Always returns a null terminated string. Returns "" if the original string wasn't found.

PARAMETERS

uint64_t

hash

hash value

RETURNS

const char*

Original string value

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dmHashReverseSafe64

const char* dmHashReverseSafe64(uint64_t hash, uint32_t* length)

Reverse hash lookup. Maps hash to original data. It is guaranteed that the returned buffer is null-terminated. If the buffer contains a valid c-string it can safely be used in printf and friends.

PARAMETERS

uint64_t	hash	hash to lookup
uint32_t*	length	original data length. Optional argument and NULL-pointer is accepted.

RETURNS

const char*

pointer to buffer. 0 if no reverse exists or if reverse lookup is disabled

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