vByte code in Rust

vbyte.rs

pub fn encode_vbyte(li: &[usize]) -> Vec<u8> {
    fn encode(k: usize) -> Vec<u8> {
        let mut vbytes = Vec::new();
        let mut tmp = k;
        while tmp >= 128 {
            vbytes.push(128 + (tmp & 127) as u8);
            tmp >>= 7;
        }
        vbytes.push(tmp as u8);
        vbytes
    }

    let mut bytes_all = Vec::new();
    for &k in li {
        let mut vbytes = encode(k);
        bytes_all.append(&mut vbytes);
    }
    bytes_all
}