diff --git a/Cargo.toml b/Cargo.toml
index 403a1e4..27a352e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,17 @@
 [package]
-name = "flowen"
+name = "elseware"
 version = "0.1.0"
 authors = ["Jake Probst <jake.probst@gmail.com>"]
 edition = "2018"
 
+[[bin]]
+name = "patch"
+path = "src/patch/main.rs"
+
+
 [dependencies]
-libpso = { path = "../libpso" }
\ No newline at end of file
+futures-preview = "=0.3.0-alpha.16"
+libpso = { path = "../libpso" }
+rand = "0.6.5"
+walkdir = "2"
+mio = "0.6"
diff --git a/src/common/mod.rs b/src/common/mod.rs
new file mode 100644
index 0000000..8aea63d
--- /dev/null
+++ b/src/common/mod.rs
@@ -0,0 +1,72 @@
+use std::net::TcpStream;
+use std::io::{Read, Write};
+use libpso::crypto::{PSOCipher, CipherError};
+use libpso::{PSOPacket, PacketParseError};
+
+#[derive(Debug)]
+pub enum PacketNetworkError {
+    CouldNotSend,
+    CipherError(CipherError),
+    PacketParseError(PacketParseError),
+    IOError(std::io::Error),
+    DataNotReady,
+}
+
+impl From<CipherError> for PacketNetworkError {
+    fn from(err: CipherError) -> PacketNetworkError {
+        PacketNetworkError::CipherError(err)
+    }
+}
+
+impl From<std::io::Error> for PacketNetworkError {
+    fn from(err: std::io::Error) -> PacketNetworkError {
+        PacketNetworkError::IOError(err)
+    }
+}
+
+impl From<PacketParseError> for PacketNetworkError {
+    fn from(err: PacketParseError) -> PacketNetworkError {
+        PacketNetworkError::PacketParseError(err)
+    }
+}
+
+
+
+pub fn recv_packet<T: Read>(socket: &mut T, cipher: &mut dyn PSOCipher) -> Result<Vec<u8>, PacketNetworkError> {
+    let mut size_buf = [0u8; 4];
+    //socket.read_exact(&mut size_buf)?;
+    /*let mut offset = 0;
+    while offset < 4 {
+        offset += socket.read(&mut size_buf[offset..])?;
+    }*/
+    let len = socket.read(&mut size_buf)?;
+    if len != 4 {
+        return Err(PacketNetworkError::DataNotReady)
+    }
+
+    let mut dec_size_buf = cipher.decrypt(&size_buf.to_vec())?;
+    let size = u16::from_le_bytes([dec_size_buf[0], dec_size_buf[1]]);
+
+    let mut data_buf = vec![0u8; (size - 4) as usize];
+    //socket.read_exact(&mut data_buf)?;
+    let mut offset = 0;
+    while offset < size as usize - 4{
+        offset += socket.read(&mut data_buf[offset..])?;
+    }
+    
+    let mut dec_data_buf = cipher.decrypt(&data_buf.to_vec())?;
+    
+    let mut full_buf = Vec::new();
+    full_buf.append(&mut dec_size_buf);
+    full_buf.append(&mut dec_data_buf);
+
+    println!("[recv]: {:X?}", full_buf);
+    Ok(full_buf)
+}
+
+pub fn send_packet<T: Write>(socket: &mut T, cipher: &mut dyn PSOCipher, pkt: &dyn PSOPacket) -> Result<(), PacketNetworkError> {
+    let buf = pkt.as_bytes();
+    println!("[send]: {:X?}", buf);
+    let cbuf = cipher.encrypt(&buf)?;
+    Ok(socket.write_all(&cbuf)?)
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..7917840
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,4 @@
+#![feature(async_await)]
+
+
+pub mod common;
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..428f09d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,8 @@
+#![feature(async_await)]
+
+mod common;
+//mod patch;
+
 fn main() {
-    println!("Hello, world!");
+    // something or other?
 }
diff --git a/src/patch/main.rs b/src/patch/main.rs
new file mode 100644
index 0000000..64ba962
--- /dev/null
+++ b/src/patch/main.rs
@@ -0,0 +1,246 @@
+#![allow(unused_imports)]
+
+use std::collections::HashMap;
+use std::net::{TcpListener, SocketAddr, Ipv4Addr};
+use std::net;
+use std::thread;
+use std::fs;
+use std::path::{Path, PathBuf, Components};
+use std::convert::AsRef;
+use mio::{Events, Poll, Token, Ready, PollOpt};
+use rand::{Rng, RngCore};
+use libpso::{PacketParseError, PSOPacket};
+use libpso::patch::packet::*;
+use libpso::crypto::{CipherError, PSOCipher, NullCipher};
+use libpso::crypto::pc::PSOPCCipher;
+use elseware::common::{send_packet, recv_packet, PacketNetworkError};
+
+const PATCH_PORT: u16 = 11000;
+const DATA_PORT: u16 = 11001;
+
+
+#[derive(Debug)]
+enum PatchError {
+    PacketNetworkError(PacketNetworkError),
+    UnexpectedPacket(Box<dyn PSOPacket>),
+    CloseConnection,
+}
+
+impl From<PacketNetworkError> for PatchError {
+    fn from(err: PacketNetworkError) -> PatchError {
+        PatchError::PacketNetworkError(err)
+    }
+}
+
+#[derive(Debug)]
+pub enum PatchPacket {
+    PatchWelcomeReply(PatchWelcomeReply),
+    LoginReply(LoginReply),
+}
+
+impl PatchPacket {
+    pub fn from_bytes(data: &Vec<u8>) -> Result<PatchPacket, PacketParseError> {
+        match data[2] {
+            0x02 => Ok(PatchPacket::PatchWelcomeReply(PatchWelcomeReply::from_bytes(data)?)),
+            0x04 => Ok(PatchPacket::LoginReply(LoginReply::from_bytes(data)?)),
+            _ => Err(PacketParseError::WrongPacketForServerType)
+        }
+    }
+}
+
+struct Client {
+    running: bool,
+    key_in: u32,
+    key_out: u32,
+    socket: mio::tcp::TcpStream,
+    cipher_in: Box<dyn PSOCipher>,
+    cipher_out: Box<dyn PSOCipher>,
+    patch_file_tree: PatchFileTree,
+    patch_file_lookup: HashMap<u32, PathBuf>,
+}
+
+impl Client {
+    fn new(socket: net::TcpStream, patch_file_tree: PatchFileTree, patch_file_lookup: HashMap<u32, PathBuf>) -> Client {
+        let mut rng = rand::thread_rng();
+        let key_in: u32 = rng.gen();
+        let key_out: u32 = rng.gen();
+
+        Client {
+            running: true,
+            key_in: key_in,
+            key_out: key_out,
+            socket: mio::tcp::TcpStream::from_stream(socket).unwrap(),
+            cipher_in: Box::new(NullCipher {}),
+            cipher_out: Box::new(NullCipher {}),
+            patch_file_tree: patch_file_tree,
+            patch_file_lookup: patch_file_lookup,
+        }
+    }
+
+    fn send(&mut self, pkt: &dyn PSOPacket) {
+        match send_packet(&mut self.socket, &mut *self.cipher_out, pkt) {
+            Ok(_) => {
+                println!("[patch] send ({:?}): {:?}", self.socket, pkt);
+            },
+            Err(err) => {
+                println!("[patch] error sending packet to {:?}: {:?}", self.socket, err);
+                self.running = false;
+            }
+        }
+    }
+
+}
+
+#[derive(Debug, Clone)]
+enum PatchFileTree {
+    Directory(PathBuf, Vec<PatchFileTree>),
+    File(PathBuf, u32), // file_id
+}
+
+fn load_patch_dir(basedir: &str, patchbase: &str, file_ids: &mut HashMap<u32, PathBuf>) -> PatchFileTree {
+    let paths = fs::read_dir(basedir).unwrap();
+
+    let mut files = Vec::new();
+    let mut dirs = Vec::new();
+    for p in paths {
+        let path = p.unwrap().path();
+        if path.is_dir() {
+            let patch_path = path.strip_prefix(basedir).unwrap();
+            dirs.push(load_patch_dir(path.to_str().unwrap(), patch_path.to_str().unwrap(), file_ids));
+        }
+        else {
+            let patch_path = path.strip_prefix(basedir).unwrap();
+            files.push(PatchFileTree::File(patch_path.to_path_buf(), file_ids.len() as u32));
+            file_ids.insert(file_ids.len() as u32, path);
+        }
+    }
+
+    files.append(&mut dirs);
+
+    PatchFileTree::Directory(PathBuf::from(patchbase), files)
+}
+
+fn generate_patch_tree(basedir: &str) -> (PatchFileTree, HashMap<u32, PathBuf>) {
+    let mut file_ids = HashMap::new();
+
+    let patch_tree = load_patch_dir(basedir, "", &mut file_ids);
+    
+    (patch_tree, file_ids)
+}
+
+
+fn get_file_list_packets(patch_file_tree: &PatchFileTree) -> Vec<Box<dyn PSOPacket>> {
+    let mut pkts: Vec<Box<dyn PSOPacket>> = Vec::new();
+
+    match patch_file_tree {
+        PatchFileTree::Directory(dir, files) => {
+            pkts.push(Box::new(ChangeDirectory::new(dir.to_str().unwrap())));
+            for file in files {
+                pkts.append(&mut get_file_list_packets(&file));
+            }
+            pkts.push(Box::new(UpOneDirectory {}));
+        },
+        PatchFileTree::File(path, id) => {
+            pkts.push(Box::new(FileInfo::new(path.to_str().unwrap(), *id)));
+        }
+    }
+
+    pkts
+}
+
+
+// so I can not figure out why this doesnt work!
+fn send_file_list(client: &mut Client) -> Result<(), PatchError> {
+    client.send(&PatchStartList {});
+
+    let pkts = get_file_list_packets(&client.patch_file_tree);
+
+    /*for pkt in pkts {
+        client.send(&*pkt);
+    }*/
+    
+    client.send(&ChangeDirectory::new(""));
+    client.send(&PatchEndList {});
+    client.send(&EndIt {});
+
+    Ok(())
+}
+
+
+fn handle_packet(client: &mut Client, pkt: PatchPacket) -> Result<(), PatchError> {
+    println!("[patch] recv({:?}): {:?}", client.socket, pkt);
+
+    match pkt {
+        PatchPacket::PatchWelcomeReply(pkt) => {
+            client.send(&RequestLogin {});
+        },
+        PatchPacket::LoginReply(pkt) => {
+            client.send(&Message::new("hello player".to_string()));
+            send_file_list(client);
+        },
+    }
+
+    Ok(())
+}
+
+fn client_loop(mut client: Client) {
+    let poll = mio::Poll::new().unwrap();
+    poll.register(&client.socket, Token(0), Ready::readable(), PollOpt::edge());
+
+    let mut events = Events::with_capacity(1024);
+    loop {
+        println!("about to poll {:?}", client.socket);
+        poll.poll(&mut events, None).unwrap();
+        println!("polled!");
+        
+        for event in &events{
+            println!("event! {:?}", event);
+            if event.token() == Token(0) {
+                let pkt = recv_packet(&mut client.socket, &mut *client.cipher_in)
+                    .and_then(|pkt| {
+                        PatchPacket::from_bytes(&pkt)
+                            .map_err(|err| err.into())
+                    });
+
+                match pkt {
+                    Ok(pkt) => {
+                        handle_packet(&mut client, pkt);
+                    },
+                    Err(err) => {
+                        println!("[patch] error recv-ing packet with {:?}: {:?}", client.socket, err);
+                    }
+                }
+            }
+        }
+    }
+}
+
+fn new_client(socket: net::TcpStream, patch_file_tree: PatchFileTree, patch_file_lookup: HashMap<u32, PathBuf>) {
+    let mut client = Client::new(socket, patch_file_tree, patch_file_lookup);
+    let welcome_pkt = PatchWelcome::new(client.key_out, client.key_in);
+    client.send(&welcome_pkt);
+    client.cipher_in = Box::new(PSOPCCipher::new(client.key_in));
+    client.cipher_out = Box::new(PSOPCCipher::new(client.key_out));
+    client_loop(client);
+}
+
+
+fn main() {
+    println!("[patch] starting server");
+
+    let listener = TcpListener::bind(&SocketAddr::from((Ipv4Addr::new(0,0,0,0), PATCH_PORT))).unwrap();
+
+    let (patch_file_tree, patch_file_lookup) = generate_patch_tree("patchfiles/");
+    
+    while let Ok((socket, addr)) = listener.accept() {
+        let local_patch_file_tree = patch_file_tree.clone();
+        let local_patch_file_lookup = patch_file_lookup.clone();
+        thread::spawn(move || {
+            println!("[patch] accepted connection: {}", addr);
+            new_client(socket, local_patch_file_tree, local_patch_file_lookup);
+        });
+    }
+
+    
+    println!("[patch] exiting...");
+}
diff --git a/src/patch/patchserver.rs b/src/patch/patchserver.rs
new file mode 100644
index 0000000..4210887
--- /dev/null
+++ b/src/patch/patchserver.rs
@@ -0,0 +1,154 @@
+use std::net::{TcpListener, TcpStream, SocketAddr, Ipv4Addr};
+use std::thread;
+use elseware::common::{send_packet, recv_packet, PacketNetworkError};
+use rand::{Rng, RngCore};
+use libpso::{PacketParseError, PSOPacket};
+use libpso::patch::packet::*;
+use libpso::crypto::{CipherError, PSOCipher, NullCipher};
+use libpso::crypto::pc::PSOPCCipher;
+
+const PATCH_PORT: u16 = 11000;
+
+
+#[derive(Debug)]
+enum PatchError {
+    PacketNetworkError(PacketNetworkError)
+}
+
+impl From<PacketNetworkError> for PatchError {
+    fn from(err: PacketNetworkError) -> PatchError {
+        PatchError::PacketNetworkError(err)
+    }
+}
+
+#[derive(Debug)]
+pub enum PatchPacket {
+    PatchWelcomeReply(PatchWelcomeReply),
+    StartFilePatching(StartFilePatching),
+}
+
+
+struct Client {
+    running: bool,
+    key_in: u32,
+    key_out: u32,
+    socket: TcpStream,
+    cipher_in: Box<PSOCipher>,
+    cipher_out: Box<PSOCipher>,
+}
+
+
+impl Client {
+    fn new(socket: TcpStream) -> Client {
+        let mut rng = rand::thread_rng();
+        let key_in: u32 = rng.gen();
+        let key_out: u32 = rng.gen();
+
+        Client {
+            running: true,
+            key_in: key_in,
+            key_out: key_out,
+            socket: socket,
+            cipher_in: Box::new(NullCipher {}),
+            cipher_out: Box::new(NullCipher {}),
+            //cipher_in: Box::new(PSOPCCipher::new(key_in)),
+            //cipher_out: Box::new(PSOPCCipher::new(key_out)),
+        }
+    }
+
+    fn send(&mut self, pkt: &PSOPacket) {
+        match send_packet(&mut self.socket, &mut *self.cipher_out, pkt) {
+            Ok(_) => {
+                println!("[patch] send ({:?}): {:?}", self.socket, pkt);
+            },
+            Err(err) => {
+                println!("[patch] error sending packet to {:?}: {:?}", self.socket, err);
+                self.running = false;
+            }
+        }
+    }
+
+    fn handle_packet(&mut self, patch_pkt: &PatchPacket) -> Result<(), PatchError> {
+        println!("[patch] recv({:?}): {:?}", self.socket, patch_pkt);
+
+        match patch_pkt {
+            PatchPacket::PatchWelcomeReply(pkt) => {
+            },
+            PatchPacket::StartFilePatching(pkt) => {
+            },
+        }
+        
+        Ok(())
+    }
+    
+    fn run(mut self) {
+        let welcome_pkt = PatchWelcome::new(self.key_out, self.key_in);
+        self.send(&welcome_pkt);
+        self.cipher_in = Box::new(PSOPCCipher::new(self.key_in));
+        self.cipher_out = Box::new(PSOPCCipher::new(self.key_out));
+        
+        while self.running {
+            let res = recv_packet(&mut self.socket, &mut *self.cipher_in)
+                .and_then(|pkt| {
+                    PatchPacket::from_bytes(&pkt)
+                        .map_err(|err| err.into())
+                })
+                .map(|pkt| {
+                    self.handle_packet(&pkt)
+                });
+
+            println!("res! {:?}", res);
+            match res {
+                Ok(_) => {},
+                Err(err) => {
+                    println!("[patch] error handling packet with {:?}: {:?}", self.socket, err);
+                    self.running = false;
+                }
+            }
+            
+                /*.or_else(|err| {
+                    println!("[patch] error handling packet with {:?}: {:?}", self.socket, err);
+                    self.running = false;
+                })?;*/
+        }
+    }
+}
+
+impl PatchPacket {
+    pub fn from_bytes(data: &Vec<u8>) -> Result<PatchPacket, PacketParseError> {
+        match data[2] {
+            0x02 => Ok(PatchPacket::PatchWelcomeReply(PatchWelcomeReply::from_bytes(data)?)),
+            0x04 => Ok(PatchPacket::StartFilePatching(StartFilePatching::from_bytes(data)?)),
+            _ => Err(PacketParseError::WrongPacketForServerType)
+        }
+    }
+}
+
+
+fn handle_client(socket: TcpStream) {
+    let client = Client::new(socket);
+    client.run();
+}
+
+pub fn patch_server_loop() {
+    println!("[patch] starting server");
+    let listener = TcpListener::bind(&SocketAddr::from((Ipv4Addr::new(0,0,0,0), PATCH_PORT))).unwrap();
+    
+    
+    loop {
+        match listener.accept() {
+            Ok((socket, addr)) => {
+                println!("[patch] accepted connection: {}", addr);
+                thread::spawn(move || {
+                    handle_client(socket);
+                });
+            }
+            Err(e) => {
+                println!("[patch] accepted connection error {:?}", e);
+            }
+        }
+    }
+
+
+    
+}