mp4box 0.8.0

Minimal MP4/ISOBMFF parser with JSON output, box decoding, and UUID support
Documentation 
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use std::io::{Read, Seek, SeekFrom};

pub fn read_slice<R: Read + Seek>(r: &mut R, offset: u64, len: u64) -> std::io::Result<Vec<u8>> {
    r.seek(SeekFrom::Start(offset))?;
    let mut v = vec![0u8; len as usize];
    r.read_exact(&mut v)?;
    Ok(v)
}

pub fn hex_dump(bytes: &[u8], start_offset: u64) -> String {
    // Simple hexdump
    let mut out = String::new();
    for (i, chunk) in bytes.chunks(16).enumerate() {
        let offs = start_offset + (i as u64) * 16;
        let hexs: String = chunk.iter().map(|b| format!("{:02x} ", b)).collect();
        let ascii: String = chunk
            .iter()
            .map(|b| {
                let c = *b;
                if (32..=126).contains(&c) {
                    c as char
                } else {
                    '.'
                }
            })
            .collect();
        out.push_str(&format!("{:08x}  {:<48}  |{}|\n", offs, hexs, ascii));
    }
    out
}