Pre serde-delete

Cargo.lock

@@ -11,6 +11,8 @@ dependencies = [
  "serde",
  "serde_json",
  "tokio",
+ "tokio-stream",
+ "tokio-util",
 ]
 
 [[package]]
@@ -31,6 +33,18 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "futures-core"
+version = "0.3.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c09fd04b7e4073ac7156a9539b57a484a8ea920f79c7c675d05d289ab6110d3"
+
+[[package]]
+name = "futures-sink"
+version = "0.3.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21163e139fa306126e6eedaf49ecdb4588f939600f0b1e770f4205ee4b7fa868"
+
 [[package]]
 name = "hermit-abi"
 version = "0.1.19"
@@ -297,6 +311,31 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "tokio-stream"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50145484efff8818b5ccd256697f36863f587da82cf8b409c53adf1e840798e3"
+dependencies = [
+ "futures-core",
+ "pin-project-lite",
+ "tokio",
+]
+
+[[package]]
+name = "tokio-util"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64910e1b9c1901aaf5375561e35b9c057d95ff41a44ede043a03e09279eabaf1"
+dependencies = [
+ "bytes",
+ "futures-core",
+ "futures-sink",
+ "log",
+ "pin-project-lite",
+ "tokio",
+]
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.2"

Cargo.toml

@@ -6,7 +6,9 @@ edition = "2018"
 
 [dependencies]
 tokio = { version = "1.15", features = ["full"] }
+tokio-util = { version = "0.7", features = ["codec"] }
+tokio-stream = "0.1"
 serde = { version = "1.0", features = ["derive", "std"] }
-bytes = "1.1"
 serde_json = "1.0"
+bytes = "1.1"
 lixcraft-derive = { path = "lixcraft-derive" }

lixcraft-derive/src/lib.rs

@@ -1,55 +1,91 @@
 use proc_macro::TokenStream;
-use syn::{Data, DeriveInput, parse_macro_input};
+use syn::{Data, DeriveInput, Fields, parse_macro_input};
 use quote::quote;
 
-#[proc_macro_derive(Wrapper)]
+macro_rules! iter_named_fields {
-pub fn derive_wrapper(input: TokenStream) -> TokenStream {
+    ($f:expr, $m:expr, $r:expr) => {
-    let input = parse_macro_input!(input as DeriveInput);
+        $f.iter().map(|field| {
-
+            let ty = &field.ty;
-    let ident = &input.ident;
+            let ident = &field.ident.as_ref().unwrap();
-
+            $m(ty, ident)
-    match &input.data {
+        }).reduce($r).unwrap_or_default()
-        Data::Struct(s) => {
-            if s.fields.len() != 1 {
-                panic!("#[derive(Wrapper)] only usable with one value")
-            }
-            for field in s.fields.iter() {
-                if field.ident.is_some() {
-                    panic!("#[derive(Wrapper)] only usable on newtype structs")
-                }
-
-                let field_type = &field.ty;
-                let output = quote!{
-                    impl From<#ident> for #field_type {
-                        fn from(v: #ident) -> Self {
-                            v.0
-                        }
-                    }
-
-                    impl Deref for #ident {
-                        type Target = #field_type;
-
-                        fn deref(&self) -> &Self::Target {
-                            &self.0
-                        }
-                    }
-                    impl DerefMut for #ident {
-                        fn deref_mut(&mut self) -> &mut Self::Target {
-                            &mut self.0
-                        }
-                    }
-
-                    impl From<#field_type> for #ident {
-                        fn from(v: #field_type) -> Self {
-                            #ident(v)
-                        }
-                    }
-                };
-
-                return output.into();
-            }
-            panic!("Unreachable")
-        },
-        _ => panic!("#[derive(Wrapper)] only usable on structs")
     }
 }
+macro_rules! iter_unnamed_fields {
+    ($f:expr, $m:expr, $r:expr) => {
+        $f.iter().enumerate().map(|(id, field)| {
+            let ty = &field.ty;
+            $m(ty, id)
+        }).reduce($r).unwrap_or_default()
+    }
+}
+
+macro_rules! impl_serializable {
+    ($struct_ident:expr, $size:expr, $serialize:expr, $deserialize:expr) => {
+        {
+            let struct_ident = $struct_ident;
+            let mut size = $size;
+            if size.is_empty() {
+                size = quote!{ 0 }
+            }
+            let serialize = $serialize;
+            let deserialize = $deserialize;
+            quote!{
+                impl JavaSerializable for #struct_ident {
+                    fn size_in_bytes(&self) -> usize {
+                        #size
+                    }
+
+                    fn serialize(&self, buf: &mut bytes::BytesMut) {
+                        #serialize
+                    }
+
+                    fn deserialize(buf: &mut bytes::Bytes) -> Result<Self, crate::serde::JavaDeserError> {
+                        Ok(#deserialize)
+                    }
+                }
+            }
+        }
+    }
+}
+
+#[proc_macro_derive(JavaSerializable)]
+pub fn derive_serializable(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+
+    let struct_ident = &input.ident;
+
+    let s = match &input.data {
+        Data::Struct(s) => s,
+        _ => panic!("#[derive(JavaSerializable)] currently only usable on structs")
+    };
+
+    let result = match &s.fields {
+        Fields::Named(named) => {
+            let fields = &named.named;
+            fields.iter().map(|field| {
+                let ty = &field.ty;
+                let ident = &field.ident.as_ref().unwrap();
+                quote!{ #ident: #ty::deserialize(buf)? }
+            }).reduce(|a, b| quote!{ #a, #b }).unwrap_or_default();
+            let (size_in_bytes, serialize, deserialize) = (
+                iter_named_fields!(fields, |_, ident| quote!{ self.#ident.size_in_bytes() }, |a, b| quote!{ #a + #b }),
+                iter_named_fields!(fields, |_, ident| quote!{ self.#ident.serialize(buf); }, |a, b| quote!{ #a #b }),
+                iter_named_fields!(fields, |ty, ident| quote!{ #ident: #ty::deserialize(buf)? }, |a, b| quote!{ #a, #b })
+            );
+            impl_serializable!(struct_ident, size_in_bytes, serialize, quote! { #struct_ident {#deserialize} })
+        },
+        Fields::Unnamed(unnamed) => {
+            let fields = &unnamed.unnamed;
+            let (size_in_bytes, serialize, deserialize) = (
+                iter_unnamed_fields!(fields, |_, ident| quote!{ self.#ident.size_in_bytes() }, |a, b| quote!{ #a + #b }),
+                iter_unnamed_fields!(fields, |_, ident| quote!{ self.#ident.serialize(buf); }, |a, b| quote!{ #a #b }),
+                iter_unnamed_fields!(fields, |ty, _| quote!{ #ty::deserialize(buf)? }, |a, b| quote!{ #a, #b })
+            );
+            impl_serializable!(struct_ident, size_in_bytes, serialize, quote! { #struct_ident (#deserialize) })
+        },
+        Fields::Unit => impl_serializable!(struct_ident, quote! { 0 }, quote! {}, quote! { #struct_ident {} })
+    }.into();
+    println!("{}", result);
+    result
+}

src/datatypes.rs

@@ -1,6 +1,7 @@
+use std::fmt::{Formatter, Write};
 use std::ops::{Deref, DerefMut};
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
-use serde::de::Error;
+use serde::de::{EnumAccess, Error, MapAccess, SeqAccess, Visitor};
 use lixcraft_derive::Wrapper;
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Wrapper)]
@@ -21,12 +22,14 @@ impl From<usize> for VarInt {
 impl Serialize for VarInt {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer {
         let mut v = self.0 as u32;
+        let mut result = Vec::with_capacity(5);
         loop {
             if v & 0x80 == 0 {
-                return serializer.serialize_u8(v as u8);
+                result.push(v as u8);
+                return serializer.serialize_bytes(&result);
             }
 
-            serializer.serialize_u8((v as u8 & 0x7f) | 0x80)?;
+            result.push((v as u8 & 0x7f) | 0x80);
             v >>= 7;
         }
     }
@@ -37,7 +40,7 @@ impl<'de> Deserialize<'de> for VarInt {
         let mut num_read = 0;
         let mut result = 0;
         loop {
-            let read = u8::deserialize(deserializer)?;
+            let read = (&mut *deserializer).deserialize_u8(VarIntVisitor{})?;
             let value = i32::from(read & 0b0111_1111);
             result |= value.overflowing_shl(7 * num_read).0;
 
@@ -81,35 +84,35 @@ impl<'de> Deserialize<'de> for NextState {
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct StatusResponseVersion {
-    name: String,
+    pub name: String,
-    protocol: i32
+    pub protocol: i32
 }
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct StatusResponseSample {
-    name: String,
+    pub name: String,
-    id: String
+    pub id: String
 }
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct StatusResponsePlayers {
-    max: i32,
+    pub max: i32,
-    online: i32,
+    pub online: i32,
-    sample: Vec<StatusResponseSample>
+    pub sample: Vec<StatusResponseSample>
 }
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct StatusResponseDescription {
-    text: String
+    pub text: String
 }
 
 #[derive(Debug)]
 pub struct StatusResponse {
-    version: StatusResponseVersion,
+    pub version: StatusResponseVersion,
-    players: StatusResponsePlayers,
+    pub players: StatusResponsePlayers,
-    description: StatusResponseDescription,
+    pub description: StatusResponseDescription,
     //#[serde(skip_serializing_if = "Option::is_none")]
-    favicon: Option<String>
+    pub favicon: Option<String>
 }
 
 impl Serialize for StatusResponse {
@@ -132,3 +135,102 @@ impl<'de> Deserialize<'de> for StatusResponse {
         }
     }
 }
+
+#[derive(Debug, Serialize, Deserialize)]
+//TODO: Serialize, Deserialize
+pub enum Font {
+    Uniform, //minecraft:uniform
+    Alt, //minecraft:alt
+    Default //minecraft:default
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum ClickEventAction {
+    open_url,
+    run_command,
+    suggest_command,
+    change_page,
+    copy_to_clipboard
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ClickEvent {
+    action: ClickEventAction,
+    value: String
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum HoverEventAction {
+    show_text,
+    show_item,
+    show_entity
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct HoverEvent {
+    action: HoverEventAction,
+    value: String //or Chat (Recursion!)
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct SharedChat {
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    bold: bool,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    italic: bool,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    underlined: bool,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    strikethrough: bool,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    obfuscated: bool,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    font: Font,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    color: String, //TODO Color code, format code or hex code
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    insertion: String,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    clickEvent: ClickEvent,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    hoverEvent: HoverEvent,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    extra: Vec<Chat>
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Score {
+    name: String, //Or UUID
+    objective: String,
+    value: String
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+//TODO: Serialize, Deserialize
+pub enum Chat {
+    StringComponent {
+        #[serde(flatten)]
+        options: SharedChat,
+        text: String
+    },
+    TranslationComponent {
+        #[serde(flatten)]
+        options: SharedChat,
+        translate: String //TODO Special strings
+    },
+    KeybindComponent {
+        #[serde(flatten)]
+        options: SharedChat,
+        keybind: String
+    },
+    ScoreComponent {
+        #[serde(flatten)]
+        options: SharedChat,
+        score: Score
+    },
+    SelectorComponent {
+        #[serde(flatten)]
+        options: SharedChat,
+        selector: String //TODO ominous
+    }
+}

src/deserializer.rs

@@ -30,6 +30,10 @@ pub struct JavaDeserializer {
 }
 
 impl JavaDeserializer {
+    pub fn from_bytes<'a, T: Deserialize<'a>>(data: Bytes) -> Result<T, JavaDeserError> {
+        let mut deserializer = JavaDeserializer{input : data };
+        T::deserialize(&mut deserializer)
+    }
 
     fn assert_remaining(&self, size: usize) -> Result<(), JavaDeserError> {
         match self.input.remaining() >= size {
@@ -114,7 +118,7 @@ impl<'a, 'de> Deserializer<'de> for &'a mut JavaDeserializer {
     }
 
     fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error> where V: Visitor<'de> {
-        let size = VarInt::deserialize(self)?;
+        let size = VarInt::deserialize(&mut *self)?;
         if *size > 32767 {
             return Err(JavaDeserError::InvalidValue)
         }
@@ -151,12 +155,12 @@ impl<'a, 'de> Deserializer<'de> for &'a mut JavaDeserializer {
     }
 
     fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error> where V: Visitor<'de> {
-        let size = VarInt::deserialize(self)?;
+        let size = VarInt::deserialize(&mut *self)?;
-        visitor.visit_seq(LengthPrefixedSeq { de: self, remaining: usize::from(size) })
+        visitor.visit_seq(KnownLengthSeq { de: self, remaining: usize::from(size) })
     }
 
     fn deserialize_tuple<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> where V: Visitor<'de> {
-        panic!("Tuple not deserializable in Java protocol")
+        visitor.visit_seq(KnownLengthSeq { de: self, remaining: len })
     }
 
     fn deserialize_tuple_struct<V>(self, name: &'static str, len: usize, visitor: V) -> Result<V::Value, Self::Error> where V: Visitor<'de> {
@@ -184,12 +188,12 @@ impl<'a, 'de> Deserializer<'de> for &'a mut JavaDeserializer {
     }
 }
 
-struct LengthPrefixedSeq<'a> {
+struct KnownLengthSeq<'a> {
     de: &'a mut JavaDeserializer,
     remaining: usize
 }
 
-impl<'de, 'a> SeqAccess<'de> for LengthPrefixedSeq<'a> {
+impl<'de, 'a> SeqAccess<'de> for KnownLengthSeq<'a> {
     type Error = <&'a mut JavaDeserializer as Deserializer<'de>>::Error;
 
     fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> where T: DeserializeSeed<'de> {
@@ -197,7 +201,7 @@ impl<'de, 'a> SeqAccess<'de> for LengthPrefixedSeq<'a> {
             0 => Ok(None),
             _ => {
                 self.remaining -= 1;
-                seed.deserialize(self.de).map(Some)
+                seed.deserialize(&mut *self.de).map(Some)
             }
         }
     }

src/main.rs

@@ -1,103 +1,11 @@
 extern crate core;
 
-mod serializer;
+pub mod serde;
-mod datatypes;
-mod deserializer;
 mod packets;
 
-use tokio::io::{AsyncRead};
-use tokio::net::{TcpListener, TcpStream};
-
 use std::error::Error;
-use std::sync::Arc;
-use tokio::net::tcp::{OwnedReadHalf, OwnedWriteHalf};
-use async_trait::async_trait;
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn Error>> {
-    let listen_addr = String::from("127.0.0.1:25565");
-
-    println!("Listening on: {}", listen_addr);
-
-    let listener = TcpListener::bind(listen_addr).await?;
-
-    while let Ok((inbound, addr)) = listener.accept().await {
-        //TODO
-    }
-
     Ok(())
 }
-pub struct Stoppable {
-    interruptor: tokio::sync::oneshot::Receiver<bool>,
-    interrupted: tokio::sync::oneshot::Sender<bool>
-}
-
-pub struct Stopper {
-    interruptable: tokio::sync::oneshot::Sender<bool>,
-    interrupted: tokio::sync::oneshot::Receiver<bool>
-}
-
-impl Stopper {
-    pub fn new() -> (Stopper, Stoppable) {
-        let (interruptable, interruptor) = tokio::sync::oneshot::channel();
-        let (interrupted_s, interrupted_r) = tokio::sync::oneshot::channel();
-
-        (Stopper {interruptable, interrupted: interrupted_r}, Stoppable {interruptor, interrupted: interrupted_s})
-    }
-
-    pub async fn stop(&mut self) {
-        if self.interruptable.is_closed() {
-            return;
-        }
-        self.interruptable.send(true).unwrap_or_default();
-        self.interrupted.await.expect_err("Send on Stopper.interrupted occured");
-    }
-}
-
-pub trait InputStream {}
-pub trait OutputStream {}
-
-pub struct StoppableAsyncRead<T: AsyncRead> {
-    inner: T,
-    stoppable: Stoppable
-}
-
-impl <T: AsyncRead> StoppableAsyncRead<T> {
-    pub fn new(inner: T, stoppable: Stoppable) -> StoppableAsyncRead<T> {
-        StoppableAsyncRead { inner, stoppable }
-    }
-
-    pub fn unwrap(self) -> T {
-        self.inner
-    }
-}
-
-impl <T: AsyncRead> InputStream for StoppableAsyncRead<T> {}
-
-impl OutputStream for OwnedWriteHalf {}
-
-#[async_trait]
-pub trait Reader<T: InputStream> {
-    async fn run(self, stream: T, connection: Arc<Connection>);
-}
-
-pub struct Connection {
-    writer: Box<parking_lot::Mutex<dyn OutputStream>>,
-    stopper: Stopper
-}
-
-impl Connection {
-    pub fn new<T: 'static + Reader<StoppableAsyncRead<OwnedReadHalf>>>(stream: TcpStream, reader: T) -> Arc<Connection> {
-        let (read, write) = stream.into_split();
-        let (stopper, stoppable) = Stopper::new();
-
-        let connection = Arc::new(Connection {
-            writer: Box::new(parking_lot::Mutex::new(write)),
-            stopper
-        });
-
-        tokio::spawn(reader.run(StoppableAsyncRead::new(read, stoppable), connection.clone()));
-
-        connection
-    }
-}

src/oldmain.rs

@@ -0,0 +1,128 @@
+use tokio::io;
+use tokio::io::{AsyncRead, AsyncWriteExt};
+use tokio::net::{TcpListener, TcpStream};
+
+use futures::FutureExt;
+use std::error::Error;
+use std::sync::Arc;
+use tokio::net::tcp::{OwnedReadHalf, OwnedWriteHalf};
+use async_trait::async_trait;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn Error>> {
+    let listen_addr = String::from("127.0.0.1:25565");
+    let server_addr = String::from("steamwar.de:25565");
+
+    println!("Listening on: {}", listen_addr);
+    println!("Proxying to: {}", server_addr);
+
+    let listener = TcpListener::bind(listen_addr).await?;
+
+    while let Ok((inbound, _)) = listener.accept().await {
+        let transfer = transfer(inbound, server_addr.clone()).map(|r| {
+            if let Err(e) = r {
+                println!("Failed to transfer; error={}", e);
+            }
+        });
+
+        tokio::spawn(transfer);
+    }
+
+    Ok(())
+}
+
+pub struct Stoppable {
+    interruptor: tokio::sync::oneshot::Receiver<bool>,
+    interrupted: tokio::sync::oneshot::Sender<bool>
+}
+
+pub struct Stopper {
+    interruptable: tokio::sync::oneshot::Sender<bool>,
+    interrupted: tokio::sync::oneshot::Receiver<bool>
+}
+
+impl Stopper {
+    pub fn new() -> (Stopper, Stoppable) {
+        let (interruptable, interruptor) = tokio::sync::oneshot::channel();
+        let (interrupted_s, interrupted_r) = tokio::sync::oneshot::channel();
+
+        (Stopper {interruptable, interrupted: interrupted_r}, Stoppable {interruptor, interrupted: interrupted_s})
+    }
+
+    pub async fn stop(&mut self) {
+        if self.interruptable.is_closed() {
+            return;
+        }
+        self.interruptable.send(true).unwrap_or_default();
+        self.interrupted.await.expect_err("Send on Stopper.interrupted occured");
+    }
+}
+
+pub trait InputStream {}
+pub trait OutputStream {}
+
+pub struct StoppableAsyncRead<T: AsyncRead> {
+    inner: T,
+    stoppable: Stoppable
+}
+
+impl <T: AsyncRead> StoppableAsyncRead<T> {
+    pub fn new(inner: T, stoppable: Stoppable) -> StoppableAsyncRead<T> {
+        StoppableAsyncRead { inner, stoppable }
+    }
+
+    pub fn unwrap(self) -> T {
+        self.inner
+    }
+}
+
+impl <T: AsyncRead> InputStream for StoppableAsyncRead<T> {}
+
+impl OutputStream for OwnedWriteHalf {}
+
+#[async_trait]
+pub trait Reader<T: InputStream> {
+    async fn run(self, stream: T, connection: Arc<Connection>);
+}
+
+pub struct Connection {
+    writer: Box<parking_lot::Mutex<dyn OutputStream>>,
+    stopper: Stopper
+}
+
+impl Connection {
+    pub fn new<T: 'static + Reader<StoppableAsyncRead<OwnedReadHalf>>>(stream: TcpStream, reader: T) -> Arc<Connection> {
+        let (read, write) = stream.into_split();
+        let (stopper, stoppable) = Stopper::new();
+
+        let connection = Arc::new(Connection {
+            writer: Box::new(parking_lot::Mutex::new(write)),
+            stopper
+        });
+
+        tokio::spawn(reader.run(StoppableAsyncRead::new(read, stoppable), connection.clone()));
+
+        connection
+    }
+}
+
+async fn transfer(mut inbound: TcpStream, proxy_addr: String) -> Result<(), Box<dyn Error>> {
+    let mut outbound = TcpStream::connect(proxy_addr).await?;
+
+    let (mut ri, mut wi) = inbound.split();
+    let (mut ro, mut wo) = outbound.split();
+
+    let client_to_server = async {
+        io::copy(&mut ri, &mut wo).await?;
+        wo.shutdown().await
+    };
+
+    let server_to_client = async {
+        io::copy(&mut ro, &mut wi).await?;
+        wi.shutdown().await
+    };
+
+    tokio::try_join!(client_to_server, server_to_client)?;
+
+    Ok(())
+}

src/packets.rs

@@ -1,31 +1,111 @@
-mod handshake {
+pub mod handshake {
-    use serde::{Serialize, Deserialize};
+    use crate::serde::{VarInt, JavaSerializable, NextState};
-    use crate::datatypes::{NextState, VarInt};
 
-    #[derive(Serialize, Deserialize, Debug)]
+    #[derive(JavaSerializable, Debug)]
     pub struct HandshakePacket {
-        protocol_version: VarInt,
+        pub protocol_version: VarInt,
-        server_address: String,
+        pub server_address: String,
-        server_port: u16,
+        pub server_port: u16,
-        next_state: NextState
+        pub next_state: NextState
     }
 }
 
-mod status {
+pub mod status {
-    use serde::{Serialize, Deserialize};
+    use crate::serde::{JavaSerializable, StatusResponse};
-    use crate::datatypes::StatusResponse;
 
-    #[derive(Serialize, Deserialize, Debug)]
+    #[derive(JavaSerializable, Debug)]
-    pub struct RequestPacket {}
+    pub struct RequestPacket{}
 
-    #[derive(Serialize, Deserialize, Debug)]
+    #[derive(JavaSerializable, Debug)]
     pub struct ResponsePacket {
-        response: StatusResponse
+        pub response: StatusResponse
     }
 
-    #[derive(Serialize, Deserialize, Debug)]
+    #[derive(JavaSerializable, Debug)]
     pub struct PingPacket {
-        payload: u64
+        pub payload: i64
     }
 }
 
+pub mod login {
+    use bytes::{BufMut, Bytes, BytesMut};
+    use crate::serde::{VarInt, JavaSerializable, Chat, JavaDeserError};
+
+    #[derive(JavaSerializable, Debug)]
+    pub struct DisconnectPacket{
+        reason: Chat
+    }
+
+    #[derive(JavaSerializable, Debug)]
+    pub struct EncryptionRequestPacket {
+        server_id: String,
+        public_key: Vec::<u8>,
+        verify_token: Vec::<u8>
+    }
+
+    #[derive(JavaSerializable, Debug)]
+    pub struct LoginSuccessPacket {
+        uuid: String, //TODO: UUID
+        username: String
+    }
+
+    #[derive(JavaSerializable, Debug)]
+    pub struct SetCompressionPacket {
+        threshold: VarInt
+    }
+
+    #[derive(JavaSerializable, Debug)]
+    pub struct PluginRequestPacket {
+        message_id: VarInt,
+        channel: String, //TODO: Identifier
+        data: Vec::<u8> //TODO: Length inferred by packet length
+    }
+
+    #[derive(JavaSerializable, Debug)]
+    pub struct LoginStartPacket {
+        name: String
+    }
+
+    #[derive(JavaSerializable, Debug)]
+    pub struct EncryptionResponsePacket {
+        shared_secret: Vec::<u8>,
+        verify_token: Vec::<u8>
+    }
+
+    #[derive(Debug)]
+    pub enum PluginResponseSuccessful {
+        Successful(Vec<u8>),
+        Failed
+    }
+    impl JavaSerializable for PluginResponseSuccessful {
+        fn size_in_bytes(&self) -> usize {
+            match self {
+                PluginResponseSuccessful::Successful(v) => true.size_in_bytes() + v.len(),
+                PluginResponseSuccessful::Failed => false.size_in_bytes()
+            }
+        }
+
+        fn serialize(&self, buf: &mut BytesMut) {
+            match self {
+                PluginResponseSuccessful::Successful(v) => {
+                    true.serialize(buf);
+                    buf.put_slice(v.as_slice())
+                }
+                PluginResponseSuccessful::Failed => false.serialize(buf)
+            }
+        }
+
+        fn deserialize(buf: &mut Bytes) -> Result<Self, JavaDeserError> {
+            match bool::deserialize(buf)? {
+                true => Ok(PluginResponseSuccessful::Successful(buf.to_vec())),
+                false => Ok(PluginResponseSuccessful::Failed)
+            }
+        }
+    }
+
+    #[derive(JavaSerializable, Debug)]
+    pub struct PluginResponsePacket {
+        message_id: VarInt,
+        data: PluginResponseSuccessful
+    }
+}

src/serde.rs

@@ -0,0 +1,431 @@
+use std::ops::{DerefMut, Deref};
+use bytes::{Buf, BufMut, Bytes, BytesMut};
+use crate::serde::JavaDeserError::{InvalidValue, MissingBytes};
+
+pub use lixcraft_derive::JavaSerializable;
+
+pub enum JavaDeserError {
+    InvalidValue,
+    MissingBytes
+}
+
+pub trait JavaSerializable: Sized {
+    fn size_in_bytes(&self) -> usize;
+    fn serialize(&self, buf: &mut BytesMut);
+    fn deserialize(buf: &mut Bytes) -> Result<Self, JavaDeserError>; // where Self: Sized
+}
+
+impl JavaSerializable for bool {
+    fn size_in_bytes(&self) -> usize {
+        1
+    }
+
+    fn serialize(&self, buf: &mut BytesMut) {
+        match *self {
+            true => buf.put_u8(1),
+            false => buf.put_u8(0)
+        }
+    }
+
+    fn deserialize(buf: &mut Bytes) -> Result<Self, JavaDeserError> {
+        match buf.len() > 0 {
+            true => match buf.get_u8() {
+                0 => Ok(false),
+                1 => Ok(true),
+                _ => Err(InvalidValue)
+            },
+            false => Err(MissingBytes)
+        }
+    }
+}
+
+macro_rules! save_get {
+    ($s:expr, $b:expr, $g:ident) => {
+        match $b.len() >= $s {
+            true => Ok($b.$g()),
+            false => Err(MissingBytes)
+        }
+    }
+}
+
+macro_rules! impl_num {
+    ($t:ty, $s:expr, $p:ident, $g:ident) => {
+        impl JavaSerializable for $t {
+            fn size_in_bytes(&self) -> usize {
+                $s
+            }
+
+            fn serialize(&self, buf: &mut BytesMut) {
+                buf.$p(*self)
+            }
+
+            fn deserialize(buf: &mut Bytes) -> Result<Self, JavaDeserError> {
+                save_get!($s, buf, $g)
+            }
+        }
+    }
+}
+
+impl_num!(i8, 1, put_i8, get_i8);
+impl_num!(u8, 1, put_u8, get_u8);
+impl_num!(i16, 2, put_i16, get_i16);
+impl_num!(u16, 2, put_u16, get_u16);
+impl_num!(i32, 4, put_i32, get_i32);
+impl_num!(i64, 8, put_i64, get_i64);
+impl_num!(f32, 4, put_f32, get_f32);
+impl_num!(f64, 8, put_f64, get_f64);
+
+macro_rules! impl_wrapper {
+    ($t:ty, $f:ty, $c:expr) => {
+        impl From<$t> for $f {
+            fn from(v: $t) -> Self {
+                v.0
+            }
+        }
+
+        impl Deref for $t {
+            type Target = $f;
+
+            fn deref(&self) -> &Self::Target {
+                &self.0
+            }
+        }
+        impl DerefMut for $t {
+            fn deref_mut(&mut self) -> &mut Self::Target {
+                &mut self.0
+            }
+        }
+
+        impl From<$f> for $t {
+            fn from(v: $f) -> Self {
+                $c(v)
+            }
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct VarInt(pub i32);
+impl_wrapper!(VarInt, i32, VarInt);
+
+impl From<VarInt> for usize {
+    fn from(v: VarInt) -> Self {
+        v.0 as usize
+    }
+}
+
+impl From<usize> for VarInt {
+    fn from(v: usize) -> Self {
+        VarInt(v as i32)
+    }
+}
+
+macro_rules! impl_varnum_ser {
+    ($u:ty, $v:expr, $b:expr) => {
+        {
+            let mut v = $v as $u;
+            loop {
+                if v & 0x80 == 0 {
+                    $b.put_u8(v as u8);
+                    return;
+                }
+
+                $b.put_u8((v as u8 & 0x7f) | 0x80);
+                v >>= 7;
+            }
+        }
+    }
+}
+
+macro_rules! impl_varnum_de {
+    ($t:ty, $r:expr, $b:expr, $m:expr) => {
+        let mut num_read = 0;
+        loop {
+            let read = save_get!(1, $b, get_u8)?;
+            let value = <$t>::from(read & 0x7f);
+            $r |= value.overflowing_shl(7 * num_read).0;
+
+            num_read += 1;
+
+            if num_read > $m {
+                return Err(InvalidValue);
+            }
+            if read & 0x80 == 0 {
+                break;
+            }
+        }
+    }
+}
+
+impl JavaSerializable for VarInt {
+    fn size_in_bytes(&self) -> usize {
+        match **self {
+            0..=127 => 1,
+            128..=16383 => 2,
+            16384..=2097151 => 3,
+            2097152..=268435455 => 4,
+            _ => 5
+        }
+    }
+
+    fn serialize(&self, buf: &mut BytesMut) {
+        impl_varnum_ser!(u32, **self, buf)
+    }
+
+    fn deserialize(buf: &mut Bytes) -> Result<Self, JavaDeserError> {
+        let mut result = 0;
+        impl_varnum_de!(i32, result, buf, 5);
+        Ok(VarInt(result))
+    }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct VarLong(pub i64);
+impl_wrapper!(VarLong, i64, VarLong);
+
+impl JavaSerializable for VarLong {
+    fn size_in_bytes(&self) -> usize {
+        match **self {
+            0..=127 => 1,
+            128..=16383 => 2,
+            16384..=2097151 => 3,
+            2097152..=268435455 => 4,
+            268435456..=34359738367 => 5,
+            34359738368..=4398046511103 => 6,
+            4398046511104..=562949953421311 => 7,
+            562949953421312..=72057594037927935 => 8,
+            72057594037927936..=9223372036854775807 => 9,
+            _ => 10
+        }
+    }
+
+    fn serialize(&self, buf: &mut BytesMut) {
+        impl_varnum_ser!(u64, **self, buf)
+    }
+
+    fn deserialize(buf: &mut Bytes) -> Result<Self, JavaDeserError> {
+        let mut result = 0;
+        impl_varnum_de!(i64, result, buf, 10);
+        Ok(VarLong(result))
+    }
+}
+
+impl JavaSerializable for String {
+    fn size_in_bytes(&self) -> usize {
+        VarInt(self.len() as i32).size_in_bytes() + self.len()
+    }
+
+    fn serialize(&self, buf: &mut BytesMut) {
+        VarInt(self.len() as i32).serialize(buf);
+        buf.put_slice(self.as_bytes())
+    }
+
+    fn deserialize(buf: &mut Bytes) -> Result<Self, JavaDeserError> {
+        let len = VarInt::deserialize(buf)?;
+        Ok(String::from_utf8(buf.split_to(usize::from(len)).to_vec()).map_err(|_| InvalidValue)?)
+    }
+}
+
+impl<T: JavaSerializable> JavaSerializable for Vec<T> {
+    fn size_in_bytes(&self) -> usize {
+        VarInt(self.len() as i32).size_in_bytes() + self.len()
+    }
+
+    fn serialize(&self, buf: &mut BytesMut) {
+        VarInt(self.len() as i32).serialize(buf);
+        for i in self.iter() {
+            i.serialize(buf)
+        }
+    }
+
+    fn deserialize(buf: &mut Bytes) -> Result<Self, JavaDeserError> {
+        let len = VarInt::deserialize(buf)?;
+        let mut result = Vec::with_capacity(usize::from(len));
+        for _ in 0..*len {
+            result.push(T::deserialize(buf)?)
+        }
+        Ok(result)
+    }
+}
+
+#[derive(Debug)]
+pub enum NextState {
+    Status,
+    Login
+}
+
+impl JavaSerializable for NextState {
+    fn size_in_bytes(&self) -> usize {
+        1
+    }
+
+    fn serialize(&self, buf: &mut BytesMut) {
+        VarInt::from(match self {
+            NextState::Status => 1,
+            NextState::Login => 2
+        }).serialize(buf)
+    }
+
+    fn deserialize(buf: &mut Bytes) -> Result<Self, JavaDeserError> {
+        match VarInt::deserialize(buf)? {
+            VarInt(1) => Ok(NextState::Status),
+            VarInt(2) => Ok(NextState::Login),
+            _ => Err(InvalidValue)
+        }
+    }
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub struct StatusResponseVersion {
+    pub name: String,
+    pub protocol: i32
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub struct StatusResponseSample {
+    pub name: String,
+    pub id: String
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub struct StatusResponsePlayers {
+    pub max: i32,
+    pub online: i32,
+    pub sample: Vec<StatusResponseSample>
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub struct StatusResponseDescription {
+    pub text: String
+}
+
+macro_rules! impl_json {
+    ($t:ty) => {
+        impl JavaSerializable for $t {
+            fn size_in_bytes(&self) -> usize {
+                serde_json::to_string(self).unwrap().size_in_bytes()
+            }
+
+            fn serialize(&self, buf: &mut BytesMut) {
+                serde_json::to_string(self).unwrap().serialize(buf)
+            }
+
+            fn deserialize(buf: &mut Bytes) -> Result<Self, JavaDeserError> {
+                match serde_json::from_str(&String::deserialize(buf)?) {
+                    Ok(v) => Ok(v),
+                    Err(_) => Err(InvalidValue)
+                }
+            }
+        }
+    }
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub struct StatusResponse {
+    pub version: StatusResponseVersion,
+    pub players: StatusResponsePlayers,
+    pub description: StatusResponseDescription,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub favicon: Option<String>
+}
+impl_json!(StatusResponse);
+
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+//TODO: Serialize, Deserialize
+pub enum Font {
+    Uniform, //minecraft:uniform
+    Alt, //minecraft:alt
+    Default //minecraft:default
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub enum ClickEventAction {
+    open_url,
+    run_command,
+    suggest_command,
+    change_page,
+    copy_to_clipboard
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub struct ClickEvent {
+    action: ClickEventAction,
+    value: String
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub enum HoverEventAction {
+    show_text,
+    show_item,
+    show_entity
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub struct HoverEvent {
+    action: HoverEventAction,
+    value: String //or Chat (Recursion!)
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub struct SharedChat {
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    bold: bool,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    italic: bool,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    underlined: bool,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    strikethrough: bool,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    obfuscated: bool,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    font: Font,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    color: String, //TODO Color code, format code or hex code
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    insertion: String,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    clickEvent: ClickEvent,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    hoverEvent: HoverEvent,
+    //#[serde(skip_serializing_if = "Option::is_none")]
+    extra: Vec<Chat>
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub struct Score {
+    name: String, //Or UUID
+    objective: String,
+    value: String
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+pub enum Chat {
+    StringComponent {
+        #[serde(flatten)]
+        options: SharedChat,
+        text: String
+    },
+    TranslationComponent {
+        #[serde(flatten)]
+        options: SharedChat,
+        translate: String //TODO Special strings
+    },
+    KeybindComponent {
+        #[serde(flatten)]
+        options: SharedChat,
+        keybind: String
+    },
+    ScoreComponent {
+        #[serde(flatten)]
+        options: SharedChat,
+        score: Score
+    },
+    SelectorComponent {
+        #[serde(flatten)]
+        options: SharedChat,
+        selector: String //TODO ominous
+    }
+}
+impl_json!(Chat);

src/serdemain.rs

@@ -0,0 +1,127 @@
+extern crate core;
+
+mod serializer;
+mod datatypes;
+mod deserializer;
+mod packets;
+mod ser;
+
+use tokio::net::{TcpListener, TcpStream};
+use tokio_stream::StreamExt;
+
+use std::error::Error;
+use std::io::ErrorKind;
+use std::net::SocketAddr;
+use bytes::{Buf, BufMut, Bytes, BytesMut};
+use tokio_util::codec::{Decoder, Encoder, Framed};
+use crate::datatypes::VarInt;
+use crate::deserializer::JavaDeserializer;
+use crate::packets::handshake::HandshakePacket;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn Error>> {
+    let listen_addr = String::from("127.0.0.1:25565");
+
+    println!("Listening on: {}", listen_addr);
+
+    let listener = TcpListener::bind(listen_addr).await?;
+
+    while let Ok((inbound, addr)) = listener.accept().await {
+        tokio::spawn(async move {process_initial(inbound, addr)});
+    }
+
+    Ok(())
+}
+
+async fn process_initial(stream: TcpStream, addr: SocketAddr) {
+    let mut framed = Framed::new(stream, LengthPrefixedFrame {});
+    match framed.next().await {
+        Some(Ok(buf)) => {
+            match JavaDeserializer::from_bytes(buf.freeze()) {
+                Ok(v) => {
+                    let v: HandshakePacket = v;
+                    println!("{:?}", v);
+                },
+                Err(_) => {}
+            }
+        },
+        None | Some(Err(_)) => {}
+    }
+}
+
+
+enum VarIntReadError {
+    BytesMissing,
+    InvalidData
+}
+
+pub struct LengthPrefixedFrame {}//TODO: Max expected length
+
+impl LengthPrefixedFrame {
+    fn try_read_var_int(src: &mut BytesMut) -> Result<(VarInt, usize), VarIntReadError> {
+        let src = src.chunk();
+        let mut num_read = 0;
+        let mut result = 0;
+        loop {
+            if src.len() <= num_read {
+                return Err(VarIntReadError::BytesMissing)
+            }
+            let read = src[num_read];
+            let value = i32::from(read & 0b0111_1111);
+            result |= value.overflowing_shl((7 * num_read) as u32).0;
+
+            num_read += 1;
+
+            if num_read > 5 {
+                return Err(VarIntReadError::InvalidData);
+            }
+            if read & 0b1000_0000 == 0 {
+                break;
+            }
+        }
+        Ok((VarInt(result), num_read))
+    }
+}
+
+impl Decoder for LengthPrefixedFrame {
+    type Item = BytesMut;
+    type Error = tokio::io::Error;
+
+    fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
+        match LengthPrefixedFrame::try_read_var_int(src) {
+            Ok((length, prefix_length)) => {
+                let total_length = prefix_length + usize::from(length);
+
+                if src.len() >= total_length {
+                    src.advance(prefix_length);
+                    Ok(Some(src.split_to(usize::from(length))))
+                } else {
+                    Ok(None)
+                }
+            },
+            Err(VarIntReadError::BytesMissing) => Ok(None),
+            Err(VarIntReadError::InvalidData) => Err(tokio::io::Error::from(ErrorKind::InvalidData))
+        }
+    }
+}
+impl Encoder<Bytes> for LengthPrefixedFrame {
+    type Error = tokio::io::Error;
+
+    fn encode(&mut self, data: Bytes, dst: &mut BytesMut) -> Result<(), Self::Error> {
+        dst.reserve(5 + data.len());
+
+        let mut v = data.len();
+        loop {
+            if v & 0x80 == 0 {
+                dst.put_u8(v as u8);
+                break;
+            }
+
+            dst.put_u8((v as u8 & 0x7f) | 0x80);
+            v >>= 7;
+        }
+
+        dst.put_slice(&data);
+        Ok(())
+    }
+}

src/serializer.rs

@@ -113,7 +113,7 @@ impl<'a> Serializer for &'a mut JavaSerializer {
 
     fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
         let v = v.as_bytes();
-        VarInt::serialize(&VarInt::from(v.len()), self)?;
+        VarInt::serialize(&VarInt::from(v.len()), &mut *self)?;
         self.serialize_bytes(v)
     }
 
@@ -155,7 +155,7 @@ impl<'a> Serializer for &'a mut JavaSerializer {
 
     fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
         match len {
-            Some(v) => VarInt::from(v).serialize(self)?,
+            Some(v) => VarInt::from(v).serialize(&mut *self)?,
             None => ()
         }
         Ok(self)
@@ -191,7 +191,7 @@ impl<'a> SerializeSeq for &'a mut JavaSerializer {
     type Error = <&'a mut JavaSerializer as Serializer>::Error;
 
     fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error> where T: Serialize {
-        value.serialize(*self)
+        value.serialize(&mut **self)
     }
 
     fn end(self) -> Result<Self::Ok, Self::Error> {
@@ -204,7 +204,7 @@ impl<'a> SerializeStruct for &'a mut JavaSerializer {
     type Error = <&'a mut JavaSerializer as Serializer>::Error;
 
     fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), Self::Error> where T: Serialize {
-        value.serialize(*self)
+        value.serialize(&mut **self)
     }
 
     fn end(self) -> Result<Self::Ok, Self::Error> {