fix compression mb

examples/test_compression.rs

@@ -0,0 +1,38 @@
+use std::{net::TcpListener, sync::{atomic::AtomicBool, atomic::Ordering}, thread};
+use std::sync::mpsc::channel;
+use rust_mc_proto::{DataBufferReader, DataBufferWriter, MCConn, MCConnTcp, MinecraftConnection, Packet, ProtocolError};
+
+const LONG_TEXT: &str = "some_long_text_wow_123123123123123123123123";
+
+fn main() {
+    let (tx, rx) = channel::<()>();
+
+    let server_tx = tx.clone();
+    thread::spawn(move || {
+        let listener = TcpListener::bind("localhost:44447").unwrap();
+
+        server_tx.send(()).unwrap();
+
+        for stream in listener.incoming() {
+            let mut stream = MCConnTcp::new(stream.unwrap());
+            stream.set_compression(2);
+
+            let packet = stream.read_packet().unwrap();
+            stream.write_packet(&packet).unwrap();
+        }
+    });
+
+    rx.recv().unwrap();
+
+    let mut conn = MCConnTcp::connect("localhost:44447").unwrap();
+    conn.set_compression(2);
+    
+    let mut packet = Packet::empty(0x12);
+    packet.write_string(LONG_TEXT).unwrap();
+    conn.write_packet(&packet).unwrap();
+
+    let mut packet = conn.read_packet().unwrap();
+    if packet.id == 0x12 && packet.read_string().unwrap() == LONG_TEXT {
+        println!("success");
+    }
+}