Decompress zstd into frames

unzstd.rs

use std::fs::File;
use std::io::{self, Read, Write, BufReader, Seek};

use zstd::Decoder;

fn main() {
    let src = std::env::args().skip(1).next().unwrap();
    let mut input = Some(File::open(src).unwrap());
    let mut buf = Vec::with_capacity(100000000);
    let mut prev = None;
    for i in 0.. {
        dbg!(i);
        let mut decoder = if let Some(input) = input.take() {
            Decoder::new(input).unwrap().single_frame()
        } else {
            let mut prev: BufReader<_> = prev.unwrap();
            dbg!(prev.stream_position().unwrap());
            Decoder::with_buffer(prev).unwrap().single_frame()
        };
        let mut output = File::create(format!("out{}", i)).unwrap();
        match decoder.read_to_end(&mut buf) {
            Ok(size) => {
                dbg!(size);
                output.write_all(&buf).unwrap();
            }
            Err(e) => {
                dbg!(e);
                break;
            }
        }
        buf.clear();
        prev = Some(decoder.finish());
    }
}