(This is the documentation for SDL3, which is the current stable version. SDL2 was the previous version!)

SDL_murmur3_32

Calculate a 32-bit MurmurHash3 value for a block of data.

Header File

Defined in <SDL3/SDL_stdinc.h>

Syntax

Uint32 SDL_murmur3_32(const void *data, size_t len, Uint32 seed);

Function Parameters

const void *	data	the data to be hashed.
size_t	len	the size of data, in bytes.
Uint32	seed	a value that alters the final hash value.

Return Value

(Uint32) Returns a Murmur3 32-bit hash value.

Remarks

https://en.wikipedia.org/wiki/MurmurHash

A seed may be specified, which changes the final results consistently, but this does not work like SDL_crc16 and SDL_crc32: you can't feed a previous result from this function back into itself as the next seed value to calculate a hash in chunks; it won't produce the same hash as it would if the same data was provided in a single call.

If you aren't sure what to provide for a seed, zero is fine. Murmur3 is not cryptographically secure, so it shouldn't be used for hashing top-secret data.

Thread Safety

It is safe to call this function from any thread.

Version

This function is available since SDL 3.1.3.

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CategoryAPI, CategoryAPIFunction, CategoryStdinc

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