oxipng 10.1.1

A lossless PNG compression optimizer
Documentation 
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use crate::{PngError, PngResult};

pub fn deflate(data: &[u8], options: zopfli::Options) -> PngResult<Vec<u8>> {
    let mut output = Vec::with_capacity(data.len());
    // Since Rust v1.74, passing &[u8] directly into zopfli causes a regression in compressed size
    // for some files. Wrapping the slice in another Read implementer such as Box fixes it for now.
    match zopfli::compress(options, zopfli::Format::Zlib, Box::new(data), &mut output) {
        Ok(()) => (),
        Err(_) => return Err(PngError::new("Failed to compress in zopfli")),
    }
    output.shrink_to_fit();
    Ok(output)
}