qr_hitchhikers.rs

use image::Luma;
use qrcode::QrCode;

fn main() {
    let bytes_limit = 2953;
    let mut bytes = 1000;
    let mut step = 100;
    let hitchikers_text = std::fs::read_to_string("hitchhikers.txt").unwrap();
    loop {
        let head_bytes = hitchikers_text
            .clone()
            .into_bytes()
            .iter()
            .take(bytes)
            .cloned()
            .collect::<Vec<u8>>();
        let compressed = lzma::compress(&head_bytes, 9).unwrap();
        let compressed_length = compressed.len();
        println!("{}", compressed_length);
        println!("{}", &bytes_limit);
        if compressed_length == bytes_limit {
            println!("{} bytes was perfect!", &bytes);
            break;
        } else if compressed_length < bytes_limit && step == 1 {
            println!(
                "{} bytes is the right amount, any more and it would be too high.",
                &bytes
            );
            break;
        } else if compressed_length > bytes_limit {
            println!(
                "{} bytes was too much! Consuming {} fewer bytes",
                &bytes, step
            );
            step -= 1;
            bytes -= step;
        } else {
            println!(
                "{} bytes was too little! Consuming {} more bytes",
                &bytes, step
            );
            if step == 1 {
                break;
            }
            bytes += step;
        }
    }
    let head_bytes = hitchikers_text
        .clone()
        .into_bytes()
        .iter()
        .take(bytes)
        .cloned()
        .collect::<Vec<u8>>();
    let compressed = lzma::compress(&head_bytes, 9).unwrap();
    // dbg!(&compressed.len());

    let string = qr_code.render().light_color(' ').dark_color('#').build();
    // let qr_code =
    // qrcode::QrCode::with_error_correction_level(&compressed, qrcode::types::EcLevel::L)
    // .unwrap();
    // let image = qr_code.render::<Luma<u8>>().build();

    // image.save("qrcode_max.png").unwrap();

    // let qr_code = qrcode::QrCode::with_error_correction_level(
    // &hitchikers_text
    // .clone()
    // .into_bytes()
    // .iter()
    // .take(2953)
    // .cloned()
    // .collect::<Vec<u8>>(),
    // qrcode::types::EcLevel::L,
    // )
    // .unwrap();
    // let image = qr_code.render::<Luma<u8>>().build();

    // image.save("qrcode_plaintext.png").unwrap();

    // println!("{}", string);

    // println!("{}", test_string.len());
    // println!("{}", decompressed_str);
}