use crate::zlib::stream::InflateReader;use std::io::BufReader; pub enum Reader<'a> {    File(usize, InflateReader<BufReader<std::fs::File>>),    Buffer(&'a [u8]),} impl<'a> Reader<'a> {    pub fn from_read(header_size: usize, file: std::fs::File) -> Reader<'a> {        Reader::File(header_size, InflateReader::from_read(std::io::BufReader::new(file)))    }    pub fn from_data(header_size: usize, data: &'a [u8]) -> Reader<'a> {        Reader::Buffer(&data[header_size..])    }} impl<'a> std::io::Read for Reader<'a> {    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {        match self {            Reader::Buffer(data) => data.read(buf),            Reader::File(header_size_left, r) => {                if *header_size_left == 0 {                    r.read(buf)                } else {                    // We must assure we return at least one byte - otherwise it's considered EOF                    while *header_size_left != 0 {                        let bytes_to_read = buf.len().min(*header_size_left);                        r.read_exact(&mut buf[..bytes_to_read])?;                        *header_size_left -= bytes_to_read;                    }                    r.read(buf)                }            }        }    }}