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 |
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 |
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 |
const char* dmHashReverseSafe64(uint64_t hash)
Returns the original string used to produce a hash.
Always returns a null terminated string. Returns " PARAMETERS RETURNS
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 RETURNSuint64_t
hash
hash value
const char*
Original string value
dmHashReverseSafe64
const char* dmHashReverseSafe64(uint64_t hash, uint32_t* length)
uint64_t
hash
hash to lookup uint32_t*
length
original data length. Optional argument and NULL-pointer is accepted.
const char*
pointer to buffer. 0 if no reverse exists or if reverse lookup is disabled