1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
7 // You may not use this file except in accordance with one or both of these
10 //! A very simple serialization framework which is used to serialize/deserialize messages as well
11 //! as ChannelsManagers and ChannelMonitors.
14 use io::{self, Read, Write};
15 use io_extras::{copy, sink};
20 use bitcoin::secp256k1::Signature;
21 use bitcoin::secp256k1::key::{PublicKey, SecretKey};
22 use bitcoin::secp256k1::constants::{PUBLIC_KEY_SIZE, SECRET_KEY_SIZE, COMPACT_SIGNATURE_SIZE};
23 use bitcoin::blockdata::script::Script;
24 use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
25 use bitcoin::consensus;
26 use bitcoin::consensus::Encodable;
27 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
28 use bitcoin::hash_types::{Txid, BlockHash};
29 use core::marker::Sized;
30 use ln::msgs::DecodeError;
31 use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
33 use util::byte_utils::{be48_to_array, slice_to_be48};
35 /// serialization buffer size
36 pub const MAX_BUF_SIZE: usize = 64 * 1024;
38 /// A trait that is similar to std::io::Write but has one extra function which can be used to size
39 /// buffers being written into.
40 /// An impl is provided for any type that also impls std::io::Write which simply ignores size
43 /// (C-not exported) as we only export serialization to/from byte arrays instead
45 /// Writes the given buf out. See std::io::Write::write_all for more
46 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error>;
47 /// Hints that data of the given size is about the be written. This may not always be called
48 /// prior to data being written and may be safely ignored.
49 fn size_hint(&mut self, size: usize);
52 impl<W: Write> Writer for W {
54 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
55 <Self as io::Write>::write_all(self, buf)
58 fn size_hint(&mut self, _size: usize) { }
61 pub(crate) struct WriterWriteAdaptor<'a, W: Writer + 'a>(pub &'a mut W);
62 impl<'a, W: Writer + 'a> Write for WriterWriteAdaptor<'a, W> {
64 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
68 fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
69 self.0.write_all(buf)?;
73 fn flush(&mut self) -> Result<(), io::Error> {
78 pub(crate) struct VecWriter(pub Vec<u8>);
79 impl Writer for VecWriter {
81 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
82 self.0.extend_from_slice(buf);
86 fn size_hint(&mut self, size: usize) {
87 self.0.reserve_exact(size);
91 /// Writer that only tracks the amount of data written - useful if you need to calculate the length
92 /// of some data when serialized but don't yet need the full data.
93 pub(crate) struct LengthCalculatingWriter(pub usize);
94 impl Writer for LengthCalculatingWriter {
96 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
101 fn size_hint(&mut self, _size: usize) {}
104 /// Essentially std::io::Take but a bit simpler and with a method to walk the underlying stream
105 /// forward to ensure we always consume exactly the fixed length specified.
106 pub(crate) struct FixedLengthReader<R: Read> {
111 impl<R: Read> FixedLengthReader<R> {
112 pub fn new(read: R, total_bytes: u64) -> Self {
113 Self { read, bytes_read: 0, total_bytes }
117 pub fn bytes_remain(&mut self) -> bool {
118 self.bytes_read != self.total_bytes
122 pub fn eat_remaining(&mut self) -> Result<(), DecodeError> {
123 copy(self, &mut sink()).unwrap();
124 if self.bytes_read != self.total_bytes {
125 Err(DecodeError::ShortRead)
131 impl<R: Read> Read for FixedLengthReader<R> {
133 fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
134 if self.total_bytes == self.bytes_read {
137 let read_len = cmp::min(dest.len() as u64, self.total_bytes - self.bytes_read);
138 match self.read.read(&mut dest[0..(read_len as usize)]) {
140 self.bytes_read += v as u64;
149 /// A Read which tracks whether any bytes have been read at all. This allows us to distinguish
150 /// between "EOF reached before we started" and "EOF reached mid-read".
151 pub(crate) struct ReadTrackingReader<R: Read> {
155 impl<R: Read> ReadTrackingReader<R> {
156 pub fn new(read: R) -> Self {
157 Self { read, have_read: false }
160 impl<R: Read> Read for ReadTrackingReader<R> {
162 fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
163 match self.read.read(dest) {
166 self.have_read = true;
174 /// A trait that various rust-lightning types implement allowing them to be written out to a Writer
176 /// (C-not exported) as we only export serialization to/from byte arrays instead
177 pub trait Writeable {
178 /// Writes self out to the given Writer
179 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error>;
181 /// Writes self out to a Vec<u8>
182 fn encode(&self) -> Vec<u8> {
183 let mut msg = VecWriter(Vec::new());
184 self.write(&mut msg).unwrap();
188 /// Writes self out to a Vec<u8>
189 fn encode_with_len(&self) -> Vec<u8> {
190 let mut msg = VecWriter(Vec::new());
191 0u16.write(&mut msg).unwrap();
192 self.write(&mut msg).unwrap();
193 let len = msg.0.len();
194 msg.0[..2].copy_from_slice(&(len as u16 - 2).to_be_bytes());
198 /// Gets the length of this object after it has been serialized. This can be overridden to
199 /// optimize cases where we prepend an object with its length.
200 // Note that LLVM optimizes this away in most cases! Check that it isn't before you override!
202 fn serialized_length(&self) -> usize {
203 let mut len_calc = LengthCalculatingWriter(0);
204 self.write(&mut len_calc).expect("No in-memory data may fail to serialize");
209 impl<'a, T: Writeable> Writeable for &'a T {
210 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> { (*self).write(writer) }
213 /// A trait that various rust-lightning types implement allowing them to be read in from a Read
215 /// (C-not exported) as we only export serialization to/from byte arrays instead
219 /// Reads a Self in from the given Read
220 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError>;
223 /// A trait that various higher-level rust-lightning types implement allowing them to be read in
224 /// from a Read given some additional set of arguments which is required to deserialize.
226 /// (C-not exported) as we only export serialization to/from byte arrays instead
227 pub trait ReadableArgs<P>
230 /// Reads a Self in from the given Read
231 fn read<R: Read>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
234 /// A trait that various rust-lightning types implement allowing them to (maybe) be read in from a Read
236 /// (C-not exported) as we only export serialization to/from byte arrays instead
237 pub trait MaybeReadable
240 /// Reads a Self in from the given Read
241 fn read<R: Read>(reader: &mut R) -> Result<Option<Self>, DecodeError>;
244 impl<T: Readable> MaybeReadable for T {
246 fn read<R: Read>(reader: &mut R) -> Result<Option<T>, DecodeError> {
247 Ok(Some(Readable::read(reader)?))
251 pub(crate) struct OptionDeserWrapper<T: Readable>(pub Option<T>);
252 impl<T: Readable> Readable for OptionDeserWrapper<T> {
254 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
255 Ok(Self(Some(Readable::read(reader)?)))
259 /// Wrapper to write each element of a Vec with no length prefix
260 pub(crate) struct VecWriteWrapper<'a, T: Writeable>(pub &'a Vec<T>);
261 impl<'a, T: Writeable> Writeable for VecWriteWrapper<'a, T> {
263 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
264 for ref v in self.0.iter() {
271 /// Wrapper to read elements from a given stream until it reaches the end of the stream.
272 pub(crate) struct VecReadWrapper<T>(pub Vec<T>);
273 impl<T: MaybeReadable> Readable for VecReadWrapper<T> {
275 fn read<R: Read>(mut reader: &mut R) -> Result<Self, DecodeError> {
276 let mut values = Vec::new();
278 let mut track_read = ReadTrackingReader::new(&mut reader);
279 match MaybeReadable::read(&mut track_read) {
280 Ok(Some(v)) => { values.push(v); },
282 // If we failed to read any bytes at all, we reached the end of our TLV
283 // stream and have simply exhausted all entries.
284 Err(ref e) if e == &DecodeError::ShortRead && !track_read.have_read => break,
285 Err(e) => return Err(e),
292 pub(crate) struct U48(pub u64);
293 impl Writeable for U48 {
295 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
296 writer.write_all(&be48_to_array(self.0))
299 impl Readable for U48 {
301 fn read<R: Read>(reader: &mut R) -> Result<U48, DecodeError> {
302 let mut buf = [0; 6];
303 reader.read_exact(&mut buf)?;
304 Ok(U48(slice_to_be48(&buf)))
308 /// Lightning TLV uses a custom variable-length integer called BigSize. It is similar to Bitcoin's
309 /// variable-length integers except that it is serialized in big-endian instead of little-endian.
311 /// Like Bitcoin's variable-length integer, it exhibits ambiguity in that certain values can be
312 /// encoded in several different ways, which we must check for at deserialization-time. Thus, if
313 /// you're looking for an example of a variable-length integer to use for your own project, move
314 /// along, this is a rather poor design.
315 pub(crate) struct BigSize(pub u64);
316 impl Writeable for BigSize {
318 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
321 (self.0 as u8).write(writer)
324 0xFDu8.write(writer)?;
325 (self.0 as u16).write(writer)
327 0x10000...0xFFFFFFFF => {
328 0xFEu8.write(writer)?;
329 (self.0 as u32).write(writer)
332 0xFFu8.write(writer)?;
333 (self.0 as u64).write(writer)
338 impl Readable for BigSize {
340 fn read<R: Read>(reader: &mut R) -> Result<BigSize, DecodeError> {
341 let n: u8 = Readable::read(reader)?;
344 let x: u64 = Readable::read(reader)?;
346 Err(DecodeError::InvalidValue)
352 let x: u32 = Readable::read(reader)?;
354 Err(DecodeError::InvalidValue)
356 Ok(BigSize(x as u64))
360 let x: u16 = Readable::read(reader)?;
362 Err(DecodeError::InvalidValue)
364 Ok(BigSize(x as u64))
367 n => Ok(BigSize(n as u64))
372 /// In TLV we occasionally send fields which only consist of, or potentially end with, a
373 /// variable-length integer which is simply truncated by skipping high zero bytes. This type
374 /// encapsulates such integers implementing Readable/Writeable for them.
375 #[cfg_attr(test, derive(PartialEq, Debug))]
376 pub(crate) struct HighZeroBytesDroppedVarInt<T>(pub T);
378 macro_rules! impl_writeable_primitive {
379 ($val_type:ty, $len: expr) => {
380 impl Writeable for $val_type {
382 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
383 writer.write_all(&self.to_be_bytes())
386 impl Writeable for HighZeroBytesDroppedVarInt<$val_type> {
388 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
389 // Skip any full leading 0 bytes when writing (in BE):
390 writer.write_all(&self.0.to_be_bytes()[(self.0.leading_zeros()/8) as usize..$len])
393 impl Readable for $val_type {
395 fn read<R: Read>(reader: &mut R) -> Result<$val_type, DecodeError> {
396 let mut buf = [0; $len];
397 reader.read_exact(&mut buf)?;
398 Ok(<$val_type>::from_be_bytes(buf))
401 impl Readable for HighZeroBytesDroppedVarInt<$val_type> {
403 fn read<R: Read>(reader: &mut R) -> Result<HighZeroBytesDroppedVarInt<$val_type>, DecodeError> {
404 // We need to accept short reads (read_len == 0) as "EOF" and handle them as simply
405 // the high bytes being dropped. To do so, we start reading into the middle of buf
406 // and then convert the appropriate number of bytes with extra high bytes out of
408 let mut buf = [0; $len*2];
409 let mut read_len = reader.read(&mut buf[$len..])?;
410 let mut total_read_len = read_len;
411 while read_len != 0 && total_read_len != $len {
412 read_len = reader.read(&mut buf[($len + total_read_len)..])?;
413 total_read_len += read_len;
415 if total_read_len == 0 || buf[$len] != 0 {
416 let first_byte = $len - ($len - total_read_len);
417 let mut bytes = [0; $len];
418 bytes.copy_from_slice(&buf[first_byte..first_byte + $len]);
419 Ok(HighZeroBytesDroppedVarInt(<$val_type>::from_be_bytes(bytes)))
421 // If the encoding had extra zero bytes, return a failure even though we know
422 // what they meant (as the TLV test vectors require this)
423 Err(DecodeError::InvalidValue)
430 impl_writeable_primitive!(u64, 8);
431 impl_writeable_primitive!(u32, 4);
432 impl_writeable_primitive!(u16, 2);
434 impl Writeable for u8 {
436 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
437 writer.write_all(&[*self])
440 impl Readable for u8 {
442 fn read<R: Read>(reader: &mut R) -> Result<u8, DecodeError> {
443 let mut buf = [0; 1];
444 reader.read_exact(&mut buf)?;
449 impl Writeable for bool {
451 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
452 writer.write_all(&[if *self {1} else {0}])
455 impl Readable for bool {
457 fn read<R: Read>(reader: &mut R) -> Result<bool, DecodeError> {
458 let mut buf = [0; 1];
459 reader.read_exact(&mut buf)?;
460 if buf[0] != 0 && buf[0] != 1 {
461 return Err(DecodeError::InvalidValue);
468 macro_rules! impl_array {
470 impl Writeable for [u8; $size]
473 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
478 impl Readable for [u8; $size]
481 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
482 let mut buf = [0u8; $size];
483 r.read_exact(&mut buf)?;
490 //TODO: performance issue with [u8; size] with impl_array!()
491 impl_array!(3); // for rgb
492 impl_array!(4); // for IPv4
493 impl_array!(10); // for OnionV2
494 impl_array!(16); // for IPv6
495 impl_array!(32); // for channel id & hmac
496 impl_array!(PUBLIC_KEY_SIZE); // for PublicKey
497 impl_array!(COMPACT_SIGNATURE_SIZE); // for Signature
498 impl_array!(1300); // for OnionPacket.hop_data
501 impl<K, V> Writeable for HashMap<K, V>
502 where K: Writeable + Eq + Hash,
506 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
507 (self.len() as u16).write(w)?;
508 for (key, value) in self.iter() {
516 impl<K, V> Readable for HashMap<K, V>
517 where K: Readable + Eq + Hash,
521 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
522 let len: u16 = Readable::read(r)?;
523 let mut ret = HashMap::with_capacity(len as usize);
525 ret.insert(K::read(r)?, V::read(r)?);
532 impl<T> Writeable for HashSet<T>
533 where T: Writeable + Eq + Hash
536 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
537 (self.len() as u16).write(w)?;
538 for item in self.iter() {
545 impl<T> Readable for HashSet<T>
546 where T: Readable + Eq + Hash
549 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
550 let len: u16 = Readable::read(r)?;
551 let mut ret = HashSet::with_capacity(len as usize);
553 if !ret.insert(T::read(r)?) {
554 return Err(DecodeError::InvalidValue)
562 impl Writeable for Vec<u8> {
564 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
565 (self.len() as u16).write(w)?;
570 impl Readable for Vec<u8> {
572 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
573 let len: u16 = Readable::read(r)?;
574 let mut ret = Vec::with_capacity(len as usize);
575 ret.resize(len as usize, 0);
576 r.read_exact(&mut ret)?;
580 impl Writeable for Vec<Signature> {
582 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
583 (self.len() as u16).write(w)?;
584 for e in self.iter() {
591 impl Readable for Vec<Signature> {
593 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
594 let len: u16 = Readable::read(r)?;
595 let byte_size = (len as usize)
596 .checked_mul(COMPACT_SIGNATURE_SIZE)
597 .ok_or(DecodeError::BadLengthDescriptor)?;
598 if byte_size > MAX_BUF_SIZE {
599 return Err(DecodeError::BadLengthDescriptor);
601 let mut ret = Vec::with_capacity(len as usize);
602 for _ in 0..len { ret.push(Readable::read(r)?); }
607 impl Writeable for Script {
608 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
609 (self.len() as u16).write(w)?;
610 w.write_all(self.as_bytes())
614 impl Readable for Script {
615 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
616 let len = <u16 as Readable>::read(r)? as usize;
617 let mut buf = vec![0; len];
618 r.read_exact(&mut buf)?;
619 Ok(Script::from(buf))
623 impl Writeable for PublicKey {
624 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
625 self.serialize().write(w)
628 fn serialized_length(&self) -> usize {
633 impl Readable for PublicKey {
634 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
635 let buf: [u8; PUBLIC_KEY_SIZE] = Readable::read(r)?;
636 match PublicKey::from_slice(&buf) {
638 Err(_) => return Err(DecodeError::InvalidValue),
643 impl Writeable for SecretKey {
644 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
645 let mut ser = [0; SECRET_KEY_SIZE];
646 ser.copy_from_slice(&self[..]);
650 fn serialized_length(&self) -> usize {
655 impl Readable for SecretKey {
656 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
657 let buf: [u8; SECRET_KEY_SIZE] = Readable::read(r)?;
658 match SecretKey::from_slice(&buf) {
660 Err(_) => return Err(DecodeError::InvalidValue),
665 impl Writeable for Sha256dHash {
666 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
667 w.write_all(&self[..])
671 impl Readable for Sha256dHash {
672 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
673 use bitcoin::hashes::Hash;
675 let buf: [u8; 32] = Readable::read(r)?;
676 Ok(Sha256dHash::from_slice(&buf[..]).unwrap())
680 impl Writeable for Signature {
681 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
682 self.serialize_compact().write(w)
685 fn serialized_length(&self) -> usize {
686 COMPACT_SIGNATURE_SIZE
690 impl Readable for Signature {
691 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
692 let buf: [u8; COMPACT_SIGNATURE_SIZE] = Readable::read(r)?;
693 match Signature::from_compact(&buf) {
695 Err(_) => return Err(DecodeError::InvalidValue),
700 impl Writeable for PaymentPreimage {
701 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
706 impl Readable for PaymentPreimage {
707 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
708 let buf: [u8; 32] = Readable::read(r)?;
709 Ok(PaymentPreimage(buf))
713 impl Writeable for PaymentHash {
714 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
719 impl Readable for PaymentHash {
720 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
721 let buf: [u8; 32] = Readable::read(r)?;
726 impl Writeable for PaymentSecret {
727 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
732 impl Readable for PaymentSecret {
733 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
734 let buf: [u8; 32] = Readable::read(r)?;
735 Ok(PaymentSecret(buf))
739 impl<T: Writeable> Writeable for Box<T> {
740 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
745 impl<T: Readable> Readable for Box<T> {
746 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
747 Ok(Box::new(Readable::read(r)?))
751 impl<T: Writeable> Writeable for Option<T> {
752 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
754 None => 0u8.write(w)?,
756 BigSize(data.serialized_length() as u64 + 1).write(w)?;
764 impl<T: Readable> Readable for Option<T>
766 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
767 let len: BigSize = Readable::read(r)?;
771 let mut reader = FixedLengthReader::new(r, len - 1);
772 Ok(Some(Readable::read(&mut reader)?))
778 impl Writeable for Txid {
779 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
780 w.write_all(&self[..])
784 impl Readable for Txid {
785 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
786 use bitcoin::hashes::Hash;
788 let buf: [u8; 32] = Readable::read(r)?;
789 Ok(Txid::from_slice(&buf[..]).unwrap())
793 impl Writeable for BlockHash {
794 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
795 w.write_all(&self[..])
799 impl Readable for BlockHash {
800 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
801 use bitcoin::hashes::Hash;
803 let buf: [u8; 32] = Readable::read(r)?;
804 Ok(BlockHash::from_slice(&buf[..]).unwrap())
808 impl Writeable for OutPoint {
809 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
816 impl Readable for OutPoint {
817 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
818 let txid = Readable::read(r)?;
819 let vout = Readable::read(r)?;
827 macro_rules! impl_consensus_ser {
828 ($bitcoin_type: ty) => {
829 impl Writeable for $bitcoin_type {
830 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
831 match self.consensus_encode(WriterWriteAdaptor(writer)) {
838 impl Readable for $bitcoin_type {
839 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
840 match consensus::encode::Decodable::consensus_decode(r) {
842 Err(consensus::encode::Error::Io(ref e)) if e.kind() == io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
843 Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e.kind())),
844 Err(_) => Err(DecodeError::InvalidValue),
850 impl_consensus_ser!(Transaction);
851 impl_consensus_ser!(TxOut);
853 impl<T: Readable> Readable for Mutex<T> {
854 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
855 let t: T = Readable::read(r)?;
859 impl<T: Writeable> Writeable for Mutex<T> {
860 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
861 self.lock().unwrap().write(w)
865 impl<A: Readable, B: Readable> Readable for (A, B) {
866 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
867 let a: A = Readable::read(r)?;
868 let b: B = Readable::read(r)?;
872 impl<A: Writeable, B: Writeable> Writeable for (A, B) {
873 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
879 impl<A: Readable, B: Readable, C: Readable> Readable for (A, B, C) {
880 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
881 let a: A = Readable::read(r)?;
882 let b: B = Readable::read(r)?;
883 let c: C = Readable::read(r)?;
887 impl<A: Writeable, B: Writeable, C: Writeable> Writeable for (A, B, C) {
888 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
895 impl Readable for () {
896 fn read<R: Read>(_r: &mut R) -> Result<Self, DecodeError> {
901 impl Writeable for String {
903 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
904 (self.len() as u16).write(w)?;
905 w.write_all(self.as_bytes())
909 impl Readable for String {
911 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
912 let v: Vec<u8> = Readable::read(r)?;
913 let ret = String::from_utf8(v).map_err(|_| DecodeError::InvalidValue)?;