Jake Probst
5 years ago
6 changed files with 343 additions and 6 deletions
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1Cargo.toml
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12psopacket/Cargo.toml
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255psopacket/src/lib.rs
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19src/lib.rs
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2src/patch/mod.rs
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58src/patch/packet.rs
@ -0,0 +1,12 @@ |
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[package] |
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name = "psopacket" |
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version = "1.0.0" |
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authors = ["Jake Probst <jake.probst@gmail.com>"] |
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edition = "2018" |
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[lib] |
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proc-macro = true |
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[dependencies] |
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syn = {version = "0.15", features=["full", "extra-traits", "parsing"]} |
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quote = "0.6" |
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@ -0,0 +1,255 @@ |
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#![recursion_limit="128"]
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extern crate proc_macro;
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use proc_macro::TokenStream;
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use syn::{parse_macro_input, ItemStruct};
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use quote::quote;
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#[proc_macro_attribute]
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pub fn pso_packet(attr: TokenStream, item: TokenStream) -> TokenStream {
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let arg = parse_macro_input!(attr as syn::LitInt);
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let pkt_cmd = arg.value() as u16;
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let parsed = parse_macro_input!(item as ItemStruct);
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let mut has_flag: bool = false;
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let mut from_bytes = Vec::new();
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let mut as_bytes = Vec::new();
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let mut dbg_write_vars = Vec::new();
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let mut partialeq = Vec::new();
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for (i, f) in parsed.fields.iter().enumerate() {
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if let Some(ident) = &f.ident {
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let ident_str = ident.to_string();
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match &f.ty {
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syn::Type::Array(arr) => {
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let array_length = if let syn::Expr::Lit(lit) = &arr.len {
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if let syn::Lit::Int(int) = &lit.lit {
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int.value() as usize
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}
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else {
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return syn::Error::new(arr.bracket_token.span, "unknown array size").to_compile_error().into();
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}
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} else {
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return syn::Error::new(arr.bracket_token.span, "unknown array size").to_compile_error().into();
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};
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match *arr.elem {
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syn::Type::Path(ref path) => {
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dbg_write_vars.push(quote! {
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write!(f, " {}: {:?}\n", #ident_str, self.#ident.iter()).unwrap();
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});
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as_bytes.push(quote! {
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for f in self.#ident.iter() {
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buf.extend_from_slice(&f.to_le_bytes())
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}
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});
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let ty = path.path.segments[0].ident.to_string();
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match ty.as_str() {
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"u8" => {
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from_bytes.push(quote! {
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#ident: {
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let mut b: [u8; #array_length] = [0; #array_length];
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if let Ok(len) = cur.read(&mut b) {
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if len != #array_length {
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return Err(PacketParseError::NotEnoughBytes);
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}
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}
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else {
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return Err(PacketParseError::NotEnoughBytes);
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};
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b
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},
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});
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},
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_ => {
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return syn::Error::new(path.path.segments[0].ident.span(), "type not supported")
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.to_compile_error().into();
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}
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}
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partialeq.push(quote! {
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if self.#ident[..] != other.#ident[..] {
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return false;
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}
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});
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}
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_ => {
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panic!("why");
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}
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}
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},
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syn::Type::Path(path) => {
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dbg_write_vars.push(quote! {
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write!(f, " {}: {:?}\n", #ident_str, self.#ident).unwrap();
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});
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as_bytes.push(quote! {
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buf.extend_from_slice(&self.#ident.to_le_bytes());
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});
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let ty = path.path.segments[0].ident.to_string();
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match ty.as_str() {
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"u8" => {
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from_bytes.push(quote! {
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#ident: {
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let mut b: [u8; 1] = [0; 1];
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if let Ok(len) = cur.read(&mut b) {
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if len != 1 {
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return Err(PacketParseError::NotEnoughBytes);
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}
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}
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else {
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return Err(PacketParseError::NotEnoughBytes);
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};
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b[0]
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},
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});
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},
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"u16" => {
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from_bytes.push(quote! {
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#ident: {
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let mut b: [u8; 2] = [0; 2];
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if let Ok(len) = cur.read(&mut b) {
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if len != 2 {
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return Err(PacketParseError::NotEnoughBytes);
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}
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}
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else {
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return Err(PacketParseError::NotEnoughBytes);
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};
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u16::from_le_bytes(b)
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},
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});
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},
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"u32" => {
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if ident_str == "flag" {
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if i != 0 {
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return syn::Error::new(ident.span(), "flag must be first member of struct").to_compile_error().into();
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}
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has_flag = true;
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continue;
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}
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from_bytes.push(quote! {
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#ident: {
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let mut b: [u8; 4] = [0; 4];
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if let Ok(len) = cur.read(&mut b) {
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if len != 4 {
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return Err(PacketParseError::NotEnoughBytes);
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}
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}
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else {
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return Err(PacketParseError::NotEnoughBytes);
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};
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u32::from_le_bytes(b)
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},
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});
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},
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_ => {
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return syn::Error::new(path.path.segments[0].ident.span(), "type not supported")
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.to_compile_error().into();
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}
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}
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partialeq.push(quote! {
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if self.#ident != other.#ident {
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return false;
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}
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});
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}
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_ => {
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}
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}
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}
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}
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let this_struct = parsed.ident.clone();
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let this_struct_str = this_struct.to_string();
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let flag_write = if has_flag {
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quote! {
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buf.extend_from_slice(&u32::to_le_bytes(self.flag));
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}
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}
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else {
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quote! {
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buf.extend_from_slice(&u32::to_le_bytes(0));
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}
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};
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let psopacket = quote! {
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impl PSOPacket for #this_struct {
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fn from_bytes(data: &Vec<u8>) -> Result<#this_struct, PacketParseError> {
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// TODO: assert cmd is correct
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let mut cur = std::io::Cursor::new(data);
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cur.seek(SeekFrom::Start(2));
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let mut b: [u8; 2] = [0; 2];
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cur.read(&mut b);
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let cmd = u16::from_le_bytes(b);
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if cmd != #pkt_cmd {
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return Err(PacketParseError::WrongPacketCommand);
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}
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if #has_flag {
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cur.seek(SeekFrom::Start(4));
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}
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else {
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cur.seek(SeekFrom::Start(8));
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}
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Ok(#this_struct {
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#(#from_bytes)*
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})
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}
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fn as_bytes(&self) -> Vec<u8> {
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let mut buf: Vec<u8> = Vec::new();
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#flag_write
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#(#as_bytes)*
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let pkt_len = buf.len() as u16;
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let mut prebuf: Vec<u8> = Vec::new();
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prebuf.extend_from_slice(&u16::to_le_bytes(pkt_len));
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prebuf.extend_from_slice(&u16::to_le_bytes(#pkt_cmd));
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prebuf.append(&mut buf);
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prebuf
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}
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}
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};
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let psopacket_debug = quote! {
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impl std::fmt::Debug for #this_struct {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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write!(f, "packet {} {{\n", #this_struct_str).unwrap();
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#(#dbg_write_vars)*
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write!(f, "}}")
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}
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}
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};
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let psopacket_partialeq = quote! {
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impl std::cmp::PartialEq for #this_struct {
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fn eq(&self, other: &Self) -> bool {
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#(#partialeq)*
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true
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}
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}
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};
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let q = quote! {
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#parsed
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#psopacket
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#psopacket_debug
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#psopacket_partialeq
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};
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//println!("[[[{}]]]", q.to_string());
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q.into()
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}
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#[proc_macro_attribute]
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pub fn game_command(attr: TokenStream, item: TokenStream) -> TokenStream {
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item
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}
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@ -1,7 +1,16 @@ |
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#[cfg(test)]
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mod tests {
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#[test]
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fn it_works() {
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assert_eq!(2 + 2, 4);
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mod patch;
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#[derive(Debug, PartialEq)]
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pub enum PacketParseError {
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NotEnoughBytes,
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WrongPacketCommand,
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}
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pub trait PSOPacket {
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fn from_bytes(data: &Vec<u8>) -> Result<Self, PacketParseError> where Self: Sized;
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fn as_bytes(&self) -> Vec<u8>;
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}
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@ -0,0 +1,2 @@ |
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mod packet;
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@ -0,0 +1,58 @@ |
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use psopacket::pso_packet;
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use crate::{PSOPacket, PacketParseError};
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use std::io::{Read, Seek, SeekFrom};
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#[pso_packet(0x02)]
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struct PatchWelcome {
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copyright: [u8; 44],
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padding: [u8; 20],
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server_key: u32,
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client_key: u32,
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}
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impl PatchWelcome {
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fn new(server_key: u32, client_key: u32) -> PatchWelcome {
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PatchWelcome {
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copyright: b"Patch Server. Copyright SonicTeam, LTD. 2001".clone(),
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padding: [0; 20],
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server_key: server_key,
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client_key: client_key,
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}
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}
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}
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enum PatchPackets {
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PatchWelcome(PatchWelcome)
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}
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#[cfg(test)]
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mod tests {
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#[test]
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fn patch_welcome() {
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use super::PSOPacket;
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let pkt = super::PatchWelcome::new(123, 456);
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assert!(pkt.as_bytes() == vec![0x4C, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x50, 0x61, 0x74, 0x63, 0x68, 0x20, 0x53, 0x65,
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0x72, 0x76, 0x65, 0x72, 0x2E, 0x20, 0x43, 0x6F, 0x70, 0x79, 0x72, 0x69, 0x67, 0x68, 0x74, 0x20,
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0x53, 0x6F, 0x6E, 0x69, 0x63, 0x54, 0x65, 0x61, 0x6D, 0x2C, 0x20, 0x4C, 0x54, 0x44, 0x2E, 0x20,
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0x32, 0x30, 0x30, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7B, 0x00, 0x00, 0x00, 0xC8, 0x01, 0x00, 0x00,
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]);
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let mut bytes = pkt.as_bytes();
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bytes.splice(32..41, b"Elsewhere".iter().cloned());
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let new_pkt = super::PatchWelcome::from_bytes(&bytes);
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assert!(new_pkt == Ok(super::PatchWelcome {
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copyright: b"Patch Server. Copyright Elsewhere, LTD. 2001".clone(),
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padding: [0; 20],
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server_key: 123,
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client_key: 456,
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}))
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}
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}
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