# SDL_murmur3_32

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

## Header File

Defined in [<SDL3/SDL_stdinc.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_stdinc.h)

## Syntax

```c
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](Uint32) | **seed** | a value that alters the final hash value. |

## Return Value

([Uint32](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](SDL_crc16) and [SDL_crc32](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 3.2.0.

----
[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryStdinc](CategoryStdinc)

