+// This file is Copyright its original authors, visible in version control
+// history.
+//
+// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
+// or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
+// You may not use this file except in accordance with one or both of these
+// licenses.
+
//! A very simple serialization framework which is used to serialize/deserialize messages as well
//! as ChannelsManagers and ChannelMonitors.
-use std::result::Result;
-use std::io::{Read, Write};
-use std::collections::HashMap;
-use std::hash::Hash;
-use std::sync::Mutex;
-use std::cmp;
+use prelude::*;
+use io::{self, Read, Write};
+use io_extras::{copy, sink};
+use core::hash::Hash;
+use sync::Mutex;
+use core::cmp;
-use secp256k1::Signature;
-use secp256k1::key::{PublicKey, SecretKey};
+use bitcoin::secp256k1::Signature;
+use bitcoin::secp256k1::key::{PublicKey, SecretKey};
+use bitcoin::secp256k1::constants::{PUBLIC_KEY_SIZE, SECRET_KEY_SIZE, COMPACT_SIGNATURE_SIZE};
use bitcoin::blockdata::script::Script;
use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
use bitcoin::consensus;
use bitcoin::consensus::Encodable;
-use bitcoin_hashes::sha256d::Hash as Sha256dHash;
-use std::marker::Sized;
+use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hash_types::{Txid, BlockHash};
+use core::marker::Sized;
use ln::msgs::DecodeError;
-use ln::channelmanager::{PaymentPreimage, PaymentHash, PaymentSecret};
-use util::byte_utils;
+use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
-use util::byte_utils::{be64_to_array, be48_to_array, be32_to_array, be16_to_array, slice_to_be16, slice_to_be32, slice_to_be48, slice_to_be64};
+use util::byte_utils::{be48_to_array, slice_to_be48};
-const MAX_BUF_SIZE: usize = 64 * 1024;
+/// serialization buffer size
+pub const MAX_BUF_SIZE: usize = 64 * 1024;
/// A trait that is similar to std::io::Write but has one extra function which can be used to size
/// buffers being written into.
/// An impl is provided for any type that also impls std::io::Write which simply ignores size
/// hints.
+///
+/// (C-not exported) as we only export serialization to/from byte arrays instead
pub trait Writer {
/// Writes the given buf out. See std::io::Write::write_all for more
- fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error>;
+ fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error>;
/// Hints that data of the given size is about the be written. This may not always be called
/// prior to data being written and may be safely ignored.
fn size_hint(&mut self, size: usize);
impl<W: Write> Writer for W {
#[inline]
- fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
- <Self as ::std::io::Write>::write_all(self, buf)
+ fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
+ <Self as io::Write>::write_all(self, buf)
}
#[inline]
fn size_hint(&mut self, _size: usize) { }
pub(crate) struct WriterWriteAdaptor<'a, W: Writer + 'a>(pub &'a mut W);
impl<'a, W: Writer + 'a> Write for WriterWriteAdaptor<'a, W> {
- fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
+ #[inline]
+ fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
self.0.write_all(buf)
}
- fn write(&mut self, buf: &[u8]) -> Result<usize, ::std::io::Error> {
+ #[inline]
+ fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
self.0.write_all(buf)?;
Ok(buf.len())
}
- fn flush(&mut self) -> Result<(), ::std::io::Error> {
+ #[inline]
+ fn flush(&mut self) -> Result<(), io::Error> {
Ok(())
}
}
pub(crate) struct VecWriter(pub Vec<u8>);
impl Writer for VecWriter {
- fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
+ #[inline]
+ fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
self.0.extend_from_slice(buf);
Ok(())
}
+ #[inline]
fn size_hint(&mut self, size: usize) {
self.0.reserve_exact(size);
}
pub(crate) struct LengthCalculatingWriter(pub usize);
impl Writer for LengthCalculatingWriter {
#[inline]
- fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
+ fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
self.0 += buf.len();
Ok(())
}
Self { read, bytes_read: 0, total_bytes }
}
+ #[inline]
pub fn bytes_remain(&mut self) -> bool {
self.bytes_read != self.total_bytes
}
+ #[inline]
pub fn eat_remaining(&mut self) -> Result<(), DecodeError> {
- ::std::io::copy(self, &mut ::std::io::sink()).unwrap();
+ copy(self, &mut sink()).unwrap();
if self.bytes_read != self.total_bytes {
Err(DecodeError::ShortRead)
} else {
}
}
impl<R: Read> Read for FixedLengthReader<R> {
- fn read(&mut self, dest: &mut [u8]) -> Result<usize, ::std::io::Error> {
+ #[inline]
+ fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
if self.total_bytes == self.bytes_read {
Ok(0)
} else {
}
}
impl<R: Read> Read for ReadTrackingReader<R> {
- fn read(&mut self, dest: &mut [u8]) -> Result<usize, ::std::io::Error> {
+ #[inline]
+ fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
match self.read.read(dest) {
Ok(0) => Ok(0),
Ok(len) => {
}
/// A trait that various rust-lightning types implement allowing them to be written out to a Writer
+///
+/// (C-not exported) as we only export serialization to/from byte arrays instead
pub trait Writeable {
/// Writes self out to the given Writer
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error>;
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error>;
/// Writes self out to a Vec<u8>
fn encode(&self) -> Vec<u8> {
0u16.write(&mut msg).unwrap();
self.write(&mut msg).unwrap();
let len = msg.0.len();
- msg.0[..2].copy_from_slice(&byte_utils::be16_to_array(len as u16 - 2));
+ msg.0[..2].copy_from_slice(&(len as u16 - 2).to_be_bytes());
msg.0
}
+
+ /// Gets the length of this object after it has been serialized. This can be overridden to
+ /// optimize cases where we prepend an object with its length.
+ // Note that LLVM optimizes this away in most cases! Check that it isn't before you override!
+ #[inline]
+ fn serialized_length(&self) -> usize {
+ let mut len_calc = LengthCalculatingWriter(0);
+ self.write(&mut len_calc).expect("No in-memory data may fail to serialize");
+ len_calc.0
+ }
}
impl<'a, T: Writeable> Writeable for &'a T {
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> { (*self).write(writer) }
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> { (*self).write(writer) }
}
/// A trait that various rust-lightning types implement allowing them to be read in from a Read
+///
+/// (C-not exported) as we only export serialization to/from byte arrays instead
pub trait Readable
where Self: Sized
{
/// A trait that various higher-level rust-lightning types implement allowing them to be read in
/// from a Read given some additional set of arguments which is required to deserialize.
+///
+/// (C-not exported) as we only export serialization to/from byte arrays instead
pub trait ReadableArgs<P>
where Self: Sized
{
}
/// A trait that various rust-lightning types implement allowing them to (maybe) be read in from a Read
+///
+/// (C-not exported) as we only export serialization to/from byte arrays instead
pub trait MaybeReadable
where Self: Sized
{
fn read<R: Read>(reader: &mut R) -> Result<Option<Self>, DecodeError>;
}
+pub(crate) struct OptionDeserWrapper<T: Readable>(pub Option<T>);
+impl<T: Readable> Readable for OptionDeserWrapper<T> {
+ #[inline]
+ fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
+ Ok(Self(Some(Readable::read(reader)?)))
+ }
+}
+
+/// Wrapper to write each element of a Vec with no length prefix
+pub(crate) struct VecWriteWrapper<'a, T: Writeable>(pub &'a Vec<T>);
+impl<'a, T: Writeable> Writeable for VecWriteWrapper<'a, T> {
+ #[inline]
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
+ for ref v in self.0.iter() {
+ v.write(writer)?;
+ }
+ Ok(())
+ }
+}
+
+/// Wrapper to read elements from a given stream until it reaches the end of the stream.
+pub(crate) struct VecReadWrapper<T: Readable>(pub Vec<T>);
+impl<T: Readable> Readable for VecReadWrapper<T> {
+ #[inline]
+ fn read<R: Read>(mut reader: &mut R) -> Result<Self, DecodeError> {
+ let mut values = Vec::new();
+ loop {
+ let mut track_read = ReadTrackingReader::new(&mut reader);
+ match Readable::read(&mut track_read) {
+ Ok(v) => { values.push(v); },
+ // If we failed to read any bytes at all, we reached the end of our TLV
+ // stream and have simply exhausted all entries.
+ Err(ref e) if e == &DecodeError::ShortRead && !track_read.have_read => break,
+ Err(e) => return Err(e),
+ }
+ }
+ Ok(Self(values))
+ }
+}
+
pub(crate) struct U48(pub u64);
impl Writeable for U48 {
#[inline]
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
writer.write_all(&be48_to_array(self.0))
}
}
pub(crate) struct BigSize(pub u64);
impl Writeable for BigSize {
#[inline]
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
match self.0 {
0...0xFC => {
(self.0 as u8).write(writer)
pub(crate) struct HighZeroBytesDroppedVarInt<T>(pub T);
macro_rules! impl_writeable_primitive {
- ($val_type:ty, $meth_write:ident, $len: expr, $meth_read:ident) => {
+ ($val_type:ty, $len: expr) => {
impl Writeable for $val_type {
#[inline]
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
- writer.write_all(&$meth_write(*self))
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
+ writer.write_all(&self.to_be_bytes())
}
}
impl Writeable for HighZeroBytesDroppedVarInt<$val_type> {
#[inline]
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
// Skip any full leading 0 bytes when writing (in BE):
- writer.write_all(&$meth_write(self.0)[(self.0.leading_zeros()/8) as usize..$len])
+ writer.write_all(&self.0.to_be_bytes()[(self.0.leading_zeros()/8) as usize..$len])
}
}
impl Readable for $val_type {
fn read<R: Read>(reader: &mut R) -> Result<$val_type, DecodeError> {
let mut buf = [0; $len];
reader.read_exact(&mut buf)?;
- Ok($meth_read(&buf))
+ Ok(<$val_type>::from_be_bytes(buf))
}
}
impl Readable for HighZeroBytesDroppedVarInt<$val_type> {
}
if total_read_len == 0 || buf[$len] != 0 {
let first_byte = $len - ($len - total_read_len);
- Ok(HighZeroBytesDroppedVarInt($meth_read(&buf[first_byte..first_byte + $len])))
+ let mut bytes = [0; $len];
+ bytes.copy_from_slice(&buf[first_byte..first_byte + $len]);
+ Ok(HighZeroBytesDroppedVarInt(<$val_type>::from_be_bytes(bytes)))
} else {
// If the encoding had extra zero bytes, return a failure even though we know
// what they meant (as the TLV test vectors require this)
}
}
-impl_writeable_primitive!(u64, be64_to_array, 8, slice_to_be64);
-impl_writeable_primitive!(u32, be32_to_array, 4, slice_to_be32);
-impl_writeable_primitive!(u16, be16_to_array, 2, slice_to_be16);
+impl_writeable_primitive!(u64, 8);
+impl_writeable_primitive!(u32, 4);
+impl_writeable_primitive!(u16, 2);
impl Writeable for u8 {
#[inline]
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
writer.write_all(&[*self])
}
}
impl Writeable for bool {
#[inline]
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
writer.write_all(&[if *self {1} else {0}])
}
}
impl Writeable for [u8; $size]
{
#[inline]
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
w.write_all(self)
}
}
impl_array!(10); // for OnionV2
impl_array!(16); // for IPv6
impl_array!(32); // for channel id & hmac
-impl_array!(33); // for PublicKey
-impl_array!(64); // for Signature
+impl_array!(PUBLIC_KEY_SIZE); // for PublicKey
+impl_array!(COMPACT_SIGNATURE_SIZE); // for Signature
impl_array!(1300); // for OnionPacket.hop_data
// HashMap
V: Writeable
{
#[inline]
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
(self.len() as u16).write(w)?;
for (key, value) in self.iter() {
key.write(w)?;
// Vectors
impl Writeable for Vec<u8> {
#[inline]
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
(self.len() as u16).write(w)?;
w.write_all(&self)
}
}
impl Writeable for Vec<Signature> {
#[inline]
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
(self.len() as u16).write(w)?;
for e in self.iter() {
e.write(w)?;
fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
let len: u16 = Readable::read(r)?;
let byte_size = (len as usize)
- .checked_mul(33)
+ .checked_mul(COMPACT_SIGNATURE_SIZE)
.ok_or(DecodeError::BadLengthDescriptor)?;
if byte_size > MAX_BUF_SIZE {
return Err(DecodeError::BadLengthDescriptor);
}
impl Writeable for Script {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
(self.len() as u16).write(w)?;
w.write_all(self.as_bytes())
}
}
impl Writeable for PublicKey {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
self.serialize().write(w)
}
+ #[inline]
+ fn serialized_length(&self) -> usize {
+ PUBLIC_KEY_SIZE
+ }
}
impl Readable for PublicKey {
fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
- let buf: [u8; 33] = Readable::read(r)?;
+ let buf: [u8; PUBLIC_KEY_SIZE] = Readable::read(r)?;
match PublicKey::from_slice(&buf) {
Ok(key) => Ok(key),
Err(_) => return Err(DecodeError::InvalidValue),
}
impl Writeable for SecretKey {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
- let mut ser = [0; 32];
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+ let mut ser = [0; SECRET_KEY_SIZE];
ser.copy_from_slice(&self[..]);
ser.write(w)
}
+ #[inline]
+ fn serialized_length(&self) -> usize {
+ SECRET_KEY_SIZE
+ }
}
impl Readable for SecretKey {
fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
- let buf: [u8; 32] = Readable::read(r)?;
+ let buf: [u8; SECRET_KEY_SIZE] = Readable::read(r)?;
match SecretKey::from_slice(&buf) {
Ok(key) => Ok(key),
Err(_) => return Err(DecodeError::InvalidValue),
}
impl Writeable for Sha256dHash {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
w.write_all(&self[..])
}
}
impl Readable for Sha256dHash {
fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
- use bitcoin_hashes::Hash;
+ use bitcoin::hashes::Hash;
let buf: [u8; 32] = Readable::read(r)?;
Ok(Sha256dHash::from_slice(&buf[..]).unwrap())
}
impl Writeable for Signature {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
self.serialize_compact().write(w)
}
+ #[inline]
+ fn serialized_length(&self) -> usize {
+ COMPACT_SIGNATURE_SIZE
+ }
}
impl Readable for Signature {
fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
- let buf: [u8; 64] = Readable::read(r)?;
+ let buf: [u8; COMPACT_SIGNATURE_SIZE] = Readable::read(r)?;
match Signature::from_compact(&buf) {
Ok(sig) => Ok(sig),
Err(_) => return Err(DecodeError::InvalidValue),
}
impl Writeable for PaymentPreimage {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
self.0.write(w)
}
}
}
impl Writeable for PaymentHash {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
self.0.write(w)
}
}
}
impl Writeable for PaymentSecret {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
self.0.write(w)
}
}
}
}
+impl<T: Writeable> Writeable for Box<T> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+ T::write(&**self, w)
+ }
+}
+
+impl<T: Readable> Readable for Box<T> {
+ fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+ Ok(Box::new(Readable::read(r)?))
+ }
+}
+
impl<T: Writeable> Writeable for Option<T> {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
match *self {
None => 0u8.write(w)?,
Some(ref data) => {
- let mut len_calc = LengthCalculatingWriter(0);
- data.write(&mut len_calc).expect("No in-memory data may fail to serialize");
- BigSize(len_calc.0 as u64 + 1).write(w)?;
+ BigSize(data.serialized_length() as u64 + 1).write(w)?;
data.write(w)?;
}
}
}
}
+impl Writeable for Txid {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+ w.write_all(&self[..])
+ }
+}
+
+impl Readable for Txid {
+ fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+ use bitcoin::hashes::Hash;
+
+ let buf: [u8; 32] = Readable::read(r)?;
+ Ok(Txid::from_slice(&buf[..]).unwrap())
+ }
+}
+
+impl Writeable for BlockHash {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+ w.write_all(&self[..])
+ }
+}
+
+impl Readable for BlockHash {
+ fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+ use bitcoin::hashes::Hash;
+
+ let buf: [u8; 32] = Readable::read(r)?;
+ Ok(BlockHash::from_slice(&buf[..]).unwrap())
+ }
+}
+
impl Writeable for OutPoint {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
self.txid.write(w)?;
self.vout.write(w)?;
Ok(())
macro_rules! impl_consensus_ser {
($bitcoin_type: ty) => {
impl Writeable for $bitcoin_type {
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
match self.consensus_encode(WriterWriteAdaptor(writer)) {
Ok(_) => Ok(()),
- Err(consensus::encode::Error::Io(e)) => Err(e),
- Err(_) => panic!("We shouldn't get a consensus::encode::Error unless our Write generated an std::io::Error"),
+ Err(e) => Err(e),
}
}
}
fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
match consensus::encode::Decodable::consensus_decode(r) {
Ok(t) => Ok(t),
- Err(consensus::encode::Error::Io(ref e)) if e.kind() == ::std::io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
- Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e)),
+ Err(consensus::encode::Error::Io(ref e)) if e.kind() == io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
+ Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e.kind())),
Err(_) => Err(DecodeError::InvalidValue),
}
}
}
}
impl<T: Writeable> Writeable for Mutex<T> {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
self.lock().unwrap().write(w)
}
}
}
}
impl<A: Writeable, B: Writeable> Writeable for (A, B) {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
self.0.write(w)?;
self.1.write(w)
}
}
+
+impl<A: Readable, B: Readable, C: Readable> Readable for (A, B, C) {
+ fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+ let a: A = Readable::read(r)?;
+ let b: B = Readable::read(r)?;
+ let c: C = Readable::read(r)?;
+ Ok((a, b, c))
+ }
+}
+impl<A: Writeable, B: Writeable, C: Writeable> Writeable for (A, B, C) {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+ self.0.write(w)?;
+ self.1.write(w)?;
+ self.2.write(w)
+ }
+}
projects / rust-lightning / blobdiff