--- /dev/null
+use std::result::Result;
+use std::io::{Read, Write};
+use std::collections::HashMap;
+use std::hash::Hash;
+use std::mem;
+
+use secp256k1::{Secp256k1, Signature};
+use secp256k1::key::PublicKey;
+use bitcoin::util::hash::Sha256dHash;
+use bitcoin::blockdata::script::Script;
+use std::marker::Sized;
+use ln::msgs::DecodeError;
+
+use util::byte_utils::{be64_to_array, be32_to_array, be16_to_array, slice_to_be16, slice_to_be32, slice_to_be64};
+
+const MAX_BUF_SIZE: usize = 16 * 1024;
+
+pub struct Writer<W> { writer: W }
+pub struct Reader<R> { reader: R }
+
+pub trait Writeable<W: Write> {
+ fn write(&self, writer: &mut Writer<W>) -> Result<(), DecodeError>;
+}
+
+pub trait Readable<R>
+ where Self: Sized,
+ R: Read
+{
+ fn read(reader: &mut Reader<R>) -> Result<Self, DecodeError>;
+}
+
+impl<W: Write> Writer<W> {
+ pub fn new(writer: W) -> Writer<W> {
+ return Writer { writer }
+ }
+ pub fn into_inner(self) -> W { self.writer }
+ pub fn get_ref(&self) -> &W { &self.writer }
+ fn write_u64(&mut self, v: u64) -> Result<(), DecodeError> {
+ Ok(self.writer.write_all(&be64_to_array(v))?)
+ }
+ fn write_u32(&mut self, v: u32) -> Result<(), DecodeError> {
+ Ok(self.writer.write_all(&be32_to_array(v))?)
+ }
+ fn write_u16(&mut self, v: u16) -> Result<(), DecodeError> {
+ Ok(self.writer.write_all(&be16_to_array(v))?)
+ }
+ fn write_u8(&mut self, v: u8) -> Result<(), DecodeError> {
+ Ok(self.writer.write_all(&[v])?)
+ }
+ fn write_bool(&mut self, v: bool) -> Result<(), DecodeError> {
+ Ok(self.writer.write_all(&[if v {1} else {0}])?)
+ }
+ pub fn write_all(&mut self, v: &[u8]) -> Result<(), DecodeError> {
+ Ok(self.writer.write_all(v)?)
+ }
+}
+
+impl<R: Read> Reader<R> {
+ pub fn new(reader: R) -> Reader<R> {
+ return Reader { reader }
+ }
+ pub fn into_inner(self) -> R { self.reader }
+ pub fn get_ref(&self) -> &R { &self.reader }
+
+ fn read_u64(&mut self) -> Result<u64, DecodeError> {
+ let mut buf = [0; 8];
+ self.reader.read_exact(&mut buf)?;
+ Ok(slice_to_be64(&buf))
+ }
+
+ fn read_u32(&mut self) -> Result<u32, DecodeError> {
+ let mut buf = [0; 4];
+ self.reader.read_exact(&mut buf)?;
+ Ok(slice_to_be32(&buf))
+ }
+
+ fn read_u16(&mut self) -> Result<u16, DecodeError> {
+ let mut buf = [0; 2];
+ self.reader.read_exact(&mut buf)?;
+ Ok(slice_to_be16(&buf))
+ }
+
+ fn read_u8(&mut self) -> Result<u8, DecodeError> {
+ let mut buf = [0; 1];
+ self.reader.read_exact(&mut buf)?;
+ Ok(buf[0])
+ }
+ fn read_bool(&mut self) -> Result<bool, DecodeError> {
+ let mut buf = [0; 1];
+ self.reader.read_exact(&mut buf)?;
+ if buf[0] != 0 && buf[0] != 1 {
+ return Err(DecodeError::InvalidValue);
+ }
+ Ok(buf[0] == 1)
+ }
+ pub fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), DecodeError> {
+ Ok(self.reader.read_exact(buf)?)
+ }
+ pub fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, DecodeError> {
+ Ok(self.reader.read_to_end(buf)?)
+ }
+}
+
+macro_rules! impl_writeable_primitive {
+ ($val_type:ty, $meth_write:ident, $meth_read:ident) => {
+ impl<W:Write> Writeable<W> for $val_type {
+ #[inline]
+ fn write(&self, writer: &mut Writer<W>) -> Result<(), DecodeError> {
+ writer.$meth_write(*self)
+ }
+ }
+ impl<R:Read> Readable<R> for $val_type {
+ #[inline]
+ fn read(reader: &mut Reader<R>) -> Result<$val_type, DecodeError> {
+ reader.$meth_read()
+ }
+ }
+ }
+}
+
+impl_writeable_primitive!(u64, write_u64, read_u64);
+impl_writeable_primitive!(u32, write_u32, read_u32);
+impl_writeable_primitive!(u16, write_u16, read_u16);
+impl_writeable_primitive!(u8, write_u8, read_u8);
+impl_writeable_primitive!(bool, write_bool, read_bool);
+
+// u8 arrays
+macro_rules! impl_array {
+ ( $size:expr ) => (
+ impl<W> Writeable<W> for [u8; $size]
+ where W: Write
+ {
+ #[inline]
+ fn write(&self, w: &mut Writer<W>) -> Result<(), DecodeError> {
+ w.write_all(self)?;
+ Ok(())
+ }
+ }
+
+ impl<R> Readable<R> for [u8; $size]
+ where R: Read
+ {
+ #[inline]
+ fn read(r: &mut Reader<R>) -> Result<Self, DecodeError> {
+ let mut buf = [0u8; $size];
+ r.read_exact(&mut buf)?;
+ Ok(buf)
+ }
+ }
+ );
+}
+
+//TODO: performance issue with [u8; size] with impl_array!()
+impl_array!(32); // for channel id & hmac
+impl_array!(33); // for PublicKey
+impl_array!(64); // for Signature
+impl_array!(1300); // for OnionPacket.hop_data
+
+// HashMap
+impl<W, K, V> Writeable<W> for HashMap<K, V>
+ where W: Write,
+ K: Writeable<W> + Eq + Hash,
+ V: Writeable<W>
+{
+ #[inline]
+ fn write(&self, w: &mut Writer<W>) -> Result<(), DecodeError> {
+ (self.len() as u16).write(w)?;
+ for (key, value) in self.iter() {
+ key.write(w)?;
+ value.write(w)?;
+ }
+ Ok(())
+ }
+}
+
+impl<R, K, V> Readable<R> for HashMap<K, V>
+ where R: Read,
+ K: Readable<R> + Eq + Hash,
+ V: Readable<R>
+{
+ #[inline]
+ fn read(r: &mut Reader<R>) -> Result<Self, DecodeError> {
+ let len: u16 = Readable::read(r)?;
+ let mut ret = HashMap::with_capacity(len as usize);
+ for _ in 0..len {
+ ret.insert(K::read(r)?, V::read(r)?);
+ }
+ Ok(ret)
+ }
+}
+
+// Vectors
+impl<W: Write, T: Writeable<W>> Writeable<W> for Vec<T> {
+ #[inline]
+ fn write(&self, w: &mut Writer<W>) -> Result<(), DecodeError> {
+ let byte_size = (self.len() as usize)
+ .checked_mul(mem::size_of::<T>())
+ .ok_or(DecodeError::BadLengthDescriptor)?;
+ if byte_size > MAX_BUF_SIZE {
+ return Err(DecodeError::BadLengthDescriptor);
+ }
+ (self.len() as u16).write(w)?;
+ // performance with Vec<u8>
+ for e in self.iter() {
+ e.write(w)?;
+ }
+ Ok(())
+ }
+}
+
+impl<R: Read, T: Readable<R>> Readable<R> for Vec<T> {
+ #[inline]
+ fn read(r: &mut Reader<R>) -> Result<Self, DecodeError> {
+ let len: u16 = Readable::read(r)?;
+ let byte_size = (len as usize)
+ .checked_mul(mem::size_of::<T>())
+ .ok_or(DecodeError::BadLengthDescriptor)?;
+ if byte_size > MAX_BUF_SIZE {
+ return Err(DecodeError::BadLengthDescriptor);
+ }
+ let mut ret = Vec::with_capacity(len as usize);
+ for _ in 0..len { ret.push(T::read(r)?); }
+ Ok(ret)
+ }
+}
+
+impl<W: Write> Writeable<W> for Script {
+ fn write(&self, w: &mut Writer<W>) -> Result<(), DecodeError> {
+ self.to_bytes().to_vec().write(w)
+ }
+}
+
+impl<R: Read> Readable<R> for Script {
+ fn read(r: &mut Reader<R>) -> Result<Self, DecodeError> {
+ let len = <u16 as Readable<R>>::read(r)? as usize;
+ let mut buf = vec![0; len];
+ r.read_exact(&mut buf)?;
+ Ok(Script::from(buf))
+ }
+}
+
+impl<W: Write> Writeable<W> for Option<Script> {
+ fn write(&self, w: &mut Writer<W>) -> Result<(), DecodeError> {
+ if let &Some(ref script) = self {
+ script.write(w)?;
+ }
+ Ok(())
+ }
+}
+
+impl<R: Read> Readable<R> for Option<Script> {
+ fn read(r: &mut Reader<R>) -> Result<Self, DecodeError> {
+ match <u16 as Readable<R>>::read(r) {
+ Ok(len) => {
+ let mut buf = vec![0; len as usize];
+ r.read_exact(&mut buf)?;
+ Ok(Some(Script::from(buf)))
+ },
+ Err(DecodeError::ShortRead) => Ok(None),
+ Err(e) => Err(e)
+ }
+ }
+}
+
+impl<W: Write> Writeable<W> for PublicKey {
+ fn write(&self, w: &mut Writer<W>) -> Result<(), DecodeError> {
+ self.serialize().write(w)
+ }
+}
+
+impl<R: Read> Readable<R> for PublicKey {
+ fn read(r: &mut Reader<R>) -> Result<Self, DecodeError> {
+ let buf: [u8; 33] = Readable::read(r)?;
+ match PublicKey::from_slice(&Secp256k1::without_caps(), &buf) {
+ Ok(key) => Ok(key),
+ Err(_) => return Err(DecodeError::BadPublicKey),
+ }
+ }
+}
+
+impl<W: Write> Writeable<W> for Sha256dHash {
+ fn write(&self, w: &mut Writer<W>) -> Result<(), DecodeError> {
+ self.as_bytes().write(w)
+ }
+}
+
+impl<R: Read> Readable<R> for Sha256dHash {
+ fn read(r: &mut Reader<R>) -> Result<Self, DecodeError> {
+ let buf: [u8; 32] = Readable::read(r)?;
+ Ok(From::from(&buf[..]))
+ }
+}
+
+impl<W: Write> Writeable<W> for Signature {
+ fn write(&self, w: &mut Writer<W>) -> Result<(), DecodeError> {
+ self.serialize_compact(&Secp256k1::without_caps()).write(w)
+ }
+}
+
+impl<R: Read> Readable<R> for Signature {
+ fn read(r: &mut Reader<R>) -> Result<Self, DecodeError> {
+ let buf: [u8; 64] = Readable::read(r)?;
+ match Signature::from_compact(&Secp256k1::without_caps(), &buf) {
+ Ok(sig) => Ok(sig),
+ Err(_) => return Err(DecodeError::BadSignature),
+ }
+ }
+}
+
+macro_rules! impl_writeable {
+ ($st:ident, {$($field:ident),*}) => {
+ impl<W: ::std::io::Write> Writeable<W> for $st {
+ fn write(&self, w: &mut Writer<W>) -> Result<(), DecodeError> {
+ $( self.$field.write(w)?; )*
+ Ok(())
+ }
+ }
+
+ impl<R: ::std::io::Read> Readable<R> for $st {
+ fn read(r: &mut Reader<R>) -> Result<Self, DecodeError> {
+ Ok(Self {
+ $($field: Readable::read(r)?),*
+ })
+ }
+ }
+ }
+}
projects / rust-lightning / commitdiff