SDL_crc16(3)

✨ SDL_crc16 ✨

okay bestie, welcome to the SDL_crc16(3) page 💖 this one lives in the SDL3 functions lineup, and it's lowkey iconic because it does exactly one thing and does it flawlessly.

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🌸 NAME 🌸

SDL_crc16 — calculate a CRC-16 value. that's it, that's the whole vibe 💅

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🎀 SYNOPSIS 🎀

#include <SDL3/SDL_stdinc.h>

Uint16 SDL_crc16(Uint16 crc, const void *data, size_t len);

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🦋 DESCRIPTION 🦋

first things first, if you wanna know what a CRC even is (cyclic redundancy check, the girlboss of error detection), go peek at this:

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

now the actual tea ☕: you can call this function multiple times to stream your data in blocks and checksum it piece by piece. no need to have the whole thing in one buffer, periodt.

every call needs you to hand back the previous CRC-16 return value so it can be updated with the next block. and the very first call for a set of blocks? pass in a zero CRC value. that's the starting line, no cap. 🌈

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💜 FUNCTION PARAMETERS 💜

• crc — the current checksum for this data set, or 0 if this is a brand new data set. main character energy only.
• data — a new block of data to add to the checksum. bring it in, girl 🫶
• len — the size, in bytes, of that new block of data.

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⭐ RETURN VALUE ⭐

it returns a CRC-16 checksum value of all the blocks in the data set. every single one. the whole squad. 💖

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🧚 THREAD SAFETY 🧚

it is safe to call this function from any thread. go off, multitask, slay in parallel, no drama 🔥

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👑 AVAILABILITY 👑

this function has been available since SDL 3.2.0. a little legend fr fr ✨

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and that's the page, bestie! this was the Simple Directmedia Layer SDL_crc16(3) situation, sitting pretty at SDL version 3.4.18 — thanks for scrolling all the way down here with me, you're a real one 🎀💅