Function write_png_chunk

native/linux/src/lib.rs:2879–2886

(out: &mut Vec<u8>, chunk_type: &[u8; 4], data: &[u8])

}

fn write_png_chunk(out: &mut Vec<u8>, chunk_type: &[u8; 4], data: &[u8]) {
    let len = data.len() as u32;
    out.extend_from_slice(&len.to_be_bytes());
    out.extend_from_slice(chunk_type);
    out.extend_from_slice(data);
    let crc = crc32(&[chunk_type.as_slice(), data].concat());
    out.extend_from_slice(&crc.to_be_bytes());
}

fn crc32(data: &[u8]) -> u32 {
    let mut crc: u32 = 0xFFFFFFFF;