fuqr

A small and hackable QR code generator

Dependency-free, heap-free no_std port of the Typescript library.

Usage

use fuqr::{generate, render_svg_into, GenerateOptions, QrCode, SvgOptions};

let qr = generate("Hello, World!", GenerateOptions::default(), &mut [])?;

// Any core::fmt::Write sink works: String, or a fixed buffer to stay heap-free.
let mut svg = String::new();
render_svg_into(&qr, SvgOptions::default(), &mut svg)?;

Reducing memory usage

This library is heap-free, so QrCode<const N: usize> defaults to fitting a maximum size version 40 QR code. Shrink N with modules_for to cap memory.

// supports maximum size qr code; matrix is ~31KB
let qr = generate(content, options, &mut [])?;

// for up to 134 chars; matrix is ~1.7kb
let qr = generate::<{ modules_for(6) }>(content, options, &mut [])?;

// for up to 425 chars; matrix is ~4.8kb
let qr = generate::<{ modules_for(13) }>(content, options, &mut [])?;

render_svg_into()'s stack use also scales with the same parameter.

Advanced

The extra plugins and encoders from the Typescript library are not yet implemented here.