You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/MCHPRS/crates/network/src/packets
    
    the code of the file until where you have to start completion: pub mod clientbound;
pub mod serverbound;

use super::NetworkState;
use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
use flate2::bufread::ZlibDecoder;
use flate2::write::ZlibEncoder;
use flate2::Compression;
use serde::Serialize;
use serverbound::*;
use std::io::{self, Cursor, Read
    
    pub fn write_compressed(&self, mut w: impl Write) -> io::Result<()> {
        // TODO: zero allocation
        let packet_id = PacketEncoder::varint(self.packet_id as i32);
        let data = [packet_id.as_slice(), self.buffer.as_slice()].concat();
        if self.buffer.len() < 256 {
            // Data Length adds another byte
            let packet_length = PacketEncoder::varint((1 + data.len()) as i32);

            w.write_all(&packet_length)?;
            // Data Length: 0 because uncompressed
            w.write_all(&[0])?;
            w.write_all(&data)?;
        } else {
            let data_length = PacketEncoder::varint(data.len() as i32);
            let mut encoder = ZlibEncoder::new(Vec::new(), Compression::default());
            encoder.write_all(&data)?;
            let compressed = encoder.finish().unwrap();
            let packet_length =
                PacketEncoder::varint((data_length.len() + compressed.len()) as i32);

            w.write_all(&packet_length)?;
            w.write_all(&data_length)?;
            w.write_all(&compressed)?;
        }

        // self.c_cache = Some(finished);
        // return self.c_cache.as_ref().unwrap();

        Ok(())
    }