fix bad compression on sending long packets

THANKS JAM \SHARP

azalea-protocol/src/lib.rs

@@ -79,14 +79,18 @@ impl Display for ServerAddress {
 
 #[cfg(test)]
 mod tests {
-    use std::io::Cursor;
+    use std::{
+        io::Cursor,
+        time::{SystemTime, UNIX_EPOCH},
+    };
 
     use crate::{
-        packets::login::{
-            serverbound_hello_packet::ServerboundHelloPacket, ServerboundLoginPacket,
+        packets::{
+            game::serverbound_chat_packet::{LastSeenMessagesUpdate, ServerboundChatPacket},
+            login::{serverbound_hello_packet::ServerboundHelloPacket, ServerboundLoginPacket},
         },
-        read::read_packet,
-        write::write_packet,
+        read::{compression_decoder, read_packet},
+        write::{compression_encoder, packet_encoder, write_packet},
     };
     use bytes::BytesMut;
     use uuid::Uuid;
@@ -140,4 +144,29 @@ mod tests {
             .await
             .unwrap();
     }
+
+    #[tokio::test]
+    async fn test_read_long_compressed_chat() {
+        let compression_threshold = 256;
+
+        let buf = packet_encoder(
+            &ServerboundChatPacket {
+                message: "a".repeat(256),
+                timestamp: 0,
+                salt: 0,
+                signature: None,
+                last_seen_messages: LastSeenMessagesUpdate::default(),
+            }
+            .get(),
+        )
+        .unwrap();
+
+        let buf = compression_encoder(&buf, compression_threshold)
+            .await
+            .unwrap();
+
+        println!("{:?}", buf);
+
+        compression_decoder(&mut Cursor::new(&buf), compression_threshold).unwrap();
+    }
 }

azalea-protocol/src/read.rs

@@ -163,7 +163,7 @@ pub enum DecompressionError {
 
 /// Get the decompressed bytes from a packet. It must have been decrypted
 /// first.
-fn compression_decoder(
+pub fn compression_decoder(
     stream: &mut Cursor<&[u8]>,
     compression_threshold: u32,
 ) -> Result<Vec<u8>, DecompressionError> {
@@ -264,8 +264,7 @@ mod tests {
     use crate::packets::game::ClientboundGamePacket;
     use std::io::Cursor;
 
-    #[tokio::test]
-    async fn test_read_packet() {
+    fn test_read_packet() {
         let mut buf: Cursor<&[u8]> = Cursor::new(&[
             56, 64, 85, 58, 141, 138, 71, 146, 193, 64, 88, 0, 0, 0, 0, 0, 0, 64, 60, 224, 105, 34,
             119, 8, 228, 67, 50, 51, 68, 194, 177, 230, 101, 0, 17, 0,

azalea-protocol/src/write.rs

@@ -29,7 +29,7 @@ pub enum PacketEncodeError {
     },
 }
 
-fn packet_encoder<P: ProtocolPacket + std::fmt::Debug>(
+pub fn packet_encoder<P: ProtocolPacket + std::fmt::Debug>(
     packet: &P,
 ) -> Result<Vec<u8>, PacketEncodeError> {
     let mut buf = Vec::new();
@@ -51,7 +51,7 @@ pub enum PacketCompressError {
     Io(#[from] std::io::Error),
 }
 
-async fn compression_encoder(
+pub async fn compression_encoder(
     data: &[u8],
     compression_threshold: u32,
 ) -> Result<Vec<u8>, PacketCompressError> {
@@ -60,15 +60,18 @@ async fn compression_encoder(
     if n < compression_threshold as usize {
         let mut buf = Vec::new();
         0.var_write_into(&mut buf)?;
-        buf.write_all(data).await?;
+        std::io::Write::write_all(&mut buf, data)?;
         Ok(buf)
     } else {
         // otherwise, compress
         let mut deflater = ZlibEncoder::new(data);
         // write deflated data to buf
-        let mut buf = Vec::new();
-        deflater.read_to_end(&mut buf).await?;
-        Ok(buf)
+        let mut data = Vec::new();
+        deflater.read_to_end(&mut data).await?;
+        let mut len_prepended_buf = Vec::new();
+        (len_prepended_buf.len() as u32).var_write_into(&mut len_prepended_buf)?;
+        len_prepended_buf.append(&mut data);
+        Ok(len_prepended_buf)
     }
 }
 
@@ -82,7 +85,7 @@ where
     P: ProtocolPacket + Debug,
     W: AsyncWrite + Unpin + Send,
 {
-    trace!("Sending packet: {:?}", packet);
+    trace!("Sending packet: {:?}", packet,);
     let mut buf = packet_encoder(packet).unwrap();
     if let Some(threshold) = compression_threshold {
         buf = compression_encoder(&buf, threshold).await.unwrap();

azalea/examples/echo.rs

@@ -4,6 +4,8 @@ use azalea::prelude::*;
 
 #[tokio::main]
 async fn main() {
+    env_logger::init();
+
     let account = Account::offline("bot");
     // or let account = Account::microsoft("email").await;