_ Git - rust-lightning/blob - lightning/src/util/ser_macros.rs

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   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
   8 // licenses.
   9
  10 macro_rules! encode_tlv {
  11         ($stream: expr, {$(($type: expr, $field: expr)),*}, {$(($optional_type: expr, $optional_field: expr)),*}) => { {
  12                 #[allow(unused_imports)]
  13                 use util::ser::{BigSize, LengthCalculatingWriter};
  14                 // Fields must be serialized in order, so we have to potentially switch between optional
  15                 // fields and normal fields while serializing. Thus, we end up having to loop over the type
  16                 // counts.
  17                 // Sadly, while LLVM does appear smart enough to make `max_field` a constant, it appears to
  18                 // refuse to unroll the loop. If we have enough entries that this is slow we can revisit
  19                 // this design in the future.
  20                 #[allow(unused_mut)]
  21                 let mut max_field: u64 = 0;
  22                 $(
  23                         if $type >= max_field { max_field = $type + 1; }
  24                 )*
  25                 $(
  26                         if $optional_type >= max_field { max_field = $optional_type + 1; }
  27                 )*
  28                 #[allow(unused_variables)]
  29                 for i in 0..max_field {
  30                         $(
  31                                 if i == $type {
  32                                         BigSize($type).write($stream)?;
  33                                         let mut len_calc = LengthCalculatingWriter(0);
  34                                         $field.write(&mut len_calc)?;
  35                                         BigSize(len_calc.0 as u64).write($stream)?;
  36                                         $field.write($stream)?;
  37                                 }
  38                         )*
  39                         $(
  40                                 if i == $optional_type {
  41                                         if let Some(ref field) = $optional_field {
  42                                                 BigSize($optional_type).write($stream)?;
  43                                                 let mut len_calc = LengthCalculatingWriter(0);
  44                                                 field.write(&mut len_calc)?;
  45                                                 BigSize(len_calc.0 as u64).write($stream)?;
  46                                                 field.write($stream)?;
  47                                         }
  48                                 }
  49                         )*
  50                 }
  51         } }
  52 }
  53
  54 macro_rules! encode_varint_length_prefixed_tlv {
  55         ($stream: expr, {$(($type: expr, $field: expr)),*}, {$(($optional_type: expr, $optional_field: expr)),*}) => { {
  56                 use util::ser::{BigSize, LengthCalculatingWriter};
  57                 #[allow(unused_mut)]
  58                 let mut len = LengthCalculatingWriter(0);
  59                 {
  60                         $(
  61                                 BigSize($type).write(&mut len)?;
  62                                 let mut field_len = LengthCalculatingWriter(0);
  63                                 $field.write(&mut field_len)?;
  64                                 BigSize(field_len.0 as u64).write(&mut len)?;
  65                                 len.0 += field_len.0;
  66                         )*
  67                         $(
  68                                 if let Some(ref field) = $optional_field {
  69                                         BigSize($optional_type).write(&mut len)?;
  70                                         let mut field_len = LengthCalculatingWriter(0);
  71                                         field.write(&mut field_len)?;
  72                                         BigSize(field_len.0 as u64).write(&mut len)?;
  73                                         len.0 += field_len.0;
  74                                 }
  75                         )*
  76                 }
  77
  78                 BigSize(len.0 as u64).write($stream)?;
  79                 encode_tlv!($stream, { $(($type, $field)),* }, { $(($optional_type, $optional_field)),* });
  80         } }
  81 }
  82
  83 macro_rules! decode_tlv {
  84         ($stream: expr, {$(($reqtype: expr, $reqfield: ident)),*}, {$(($type: expr, $field: ident)),*}) => { {
  85                 use ln::msgs::DecodeError;
  86                 let mut last_seen_type: Option<u64> = None;
  87                 'tlv_read: loop {
  88                         use util::ser;
  89
  90                         // First decode the type of this TLV:
  91                         let typ: ser::BigSize = {
  92                                 // We track whether any bytes were read during the consensus_decode call to
  93                                 // determine whether we should break or return ShortRead if we get an
  94                                 // UnexpectedEof. This should in every case be largely cosmetic, but its nice to
  95                                 // pass the TLV test vectors exactly, which requre this distinction.
  96                                 let mut tracking_reader = ser::ReadTrackingReader::new($stream);
  97                                 match ser::Readable::read(&mut tracking_reader) {
  98                                         Err(DecodeError::ShortRead) => {
  99                                                 if !tracking_reader.have_read {
 100                                                         break 'tlv_read
 101                                                 } else {
 102                                                         Err(DecodeError::ShortRead)?
 103                                                 }
 104                                         },
 105                                         Err(e) => Err(e)?,
 106                                         Ok(t) => t,
 107                                 }
 108                         };
 109
 110                         // Types must be unique and monotonically increasing:
 111                         match last_seen_type {
 112                                 Some(t) if typ.0 <= t => {
 113                                         Err(DecodeError::InvalidValue)?
 114                                 },
 115                                 _ => {},
 116                         }
 117                         // As we read types, make sure we hit every required type:
 118                         $(if (last_seen_type.is_none() || last_seen_type.unwrap() < $reqtype) && typ.0 > $reqtype {
 119                                 Err(DecodeError::InvalidValue)?
 120                         })*
 121                         last_seen_type = Some(typ.0);
 122
 123                         // Finally, read the length and value itself:
 124                         let length: ser::BigSize = Readable::read($stream)?;
 125                         let mut s = ser::FixedLengthReader::new($stream, length.0);
 126                         match typ.0 {
 127                                 $($reqtype => {
 128                                         $reqfield = ser::Readable::read(&mut s)?;
 129                                         if s.bytes_remain() {
 130                                                 s.eat_remaining()?; // Return ShortRead if there's actually not enough bytes
 131                                                 Err(DecodeError::InvalidValue)?
 132                                         }
 133                                 },)*
 134                                 $($type => {
 135                                         $field = Some(ser::Readable::read(&mut s)?);
 136                                         if s.bytes_remain() {
 137                                                 s.eat_remaining()?; // Return ShortRead if there's actually not enough bytes
 138                                                 Err(DecodeError::InvalidValue)?
 139                                         }
 140                                 },)*
 141                                 x if x % 2 == 0 => {
 142                                         Err(DecodeError::UnknownRequiredFeature)?
 143                                 },
 144                                 _ => {},
 145                         }
 146                         s.eat_remaining()?;
 147                 }
 148                 // Make sure we got to each required type after we've read every TLV:
 149                 $(if last_seen_type.is_none() || last_seen_type.unwrap() < $reqtype {
 150                         Err(DecodeError::InvalidValue)?
 151                 })*
 152         } }
 153 }
 154
 155 macro_rules! impl_writeable {
 156         ($st:ident, $len: expr, {$($field:ident),*}) => {
 157                 impl ::util::ser::Writeable for $st {
 158                         fn write<W: ::util::ser::Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 159                                 if $len != 0 {
 160                                         w.size_hint($len);
 161                                 }
 162                                 #[cfg(any(test, feature = "fuzztarget"))]
 163                                 {
 164                                         // In tests, assert that the hard-coded length matches the actual one
 165                                         if $len != 0 {
 166                                                 use util::ser::LengthCalculatingWriter;
 167                                                 let mut len_calc = LengthCalculatingWriter(0);
 168                                                 $( self.$field.write(&mut len_calc)?; )*
 169                                                 assert_eq!(len_calc.0, $len);
 170                                         }
 171                                 }
 172                                 $( self.$field.write(w)?; )*
 173                                 Ok(())
 174                         }
 175                 }
 176
 177                 impl ::util::ser::Readable for $st {
 178                         fn read<R: ::std::io::Read>(r: &mut R) -> Result<Self, ::ln::msgs::DecodeError> {
 179                                 Ok(Self {
 180                                         $($field: ::util::ser::Readable::read(r)?),*
 181                                 })
 182                         }
 183                 }
 184         }
 185 }
 186 macro_rules! impl_writeable_len_match {
 187         ($struct: ident, $cmp: tt, {$({$match: pat, $length: expr}),*}, {$($field:ident),*}) => {
 188                 impl Writeable for $struct {
 189                         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 190                                 let len = match *self {
 191                                         $($match => $length,)*
 192                                 };
 193                                 w.size_hint(len);
 194                                 #[cfg(any(test, feature = "fuzztarget"))]
 195                                 {
 196                                         // In tests, assert that the hard-coded length matches the actual one
 197                                         use util::ser::LengthCalculatingWriter;
 198                                         let mut len_calc = LengthCalculatingWriter(0);
 199                                         $( self.$field.write(&mut len_calc)?; )*
 200                                         assert!(len_calc.0 $cmp len);
 201                                 }
 202                                 $( self.$field.write(w)?; )*
 203                                 Ok(())
 204                         }
 205                 }
 206
 207                 impl ::util::ser::Readable for $struct {
 208                         fn read<R: ::std::io::Read>(r: &mut R) -> Result<Self, DecodeError> {
 209                                 Ok(Self {
 210                                         $($field: Readable::read(r)?),*
 211                                 })
 212                         }
 213                 }
 214         };
 215         ($struct: ident, {$({$match: pat, $length: expr}),*}, {$($field:ident),*}) => {
 216                 impl_writeable_len_match!($struct, ==, { $({ $match, $length }),* }, { $($field),* });
 217         }
 218 }
 219
 220 /// Write out two bytes to indicate the version of an object.
 221 /// $this_version represents a unique version of a type. Incremented whenever the type's
 222 ///               serialization format has changed or has a new interpretation. Used by a type's
 223 ///               reader to determine how to interpret fields or if it can understand a serialized
 224 ///               object.
 225 /// $min_version_that_can_read_this is the minimum reader version which can understand this
 226 ///                                 serialized object. Previous versions will simply err with a
 227 ///                                 DecodeError::UnknownVersion.
 228 ///
 229 /// Updates to either $this_version or $min_version_that_can_read_this should be included in
 230 /// release notes.
 231 ///
 232 /// Both version fields can be specific to this type of object.
 233 macro_rules! write_ver_prefix {
 234         ($stream: expr, $this_version: expr, $min_version_that_can_read_this: expr) => {
 235                 $stream.write_all(&[$this_version; 1])?;
 236                 $stream.write_all(&[$min_version_that_can_read_this; 1])?;
 237         }
 238 }
 239
 240 /// Writes out a suffix to an object which contains potentially backwards-compatible, optional
 241 /// fields which old nodes can happily ignore.
 242 ///
 243 /// It is written out in TLV format and, as with all TLV fields, unknown even fields cause a
 244 /// DecodeError::UnknownRequiredFeature error, with unknown odd fields ignored.
 245 ///
 246 /// This is the preferred method of adding new fields that old nodes can ignore and still function
 247 /// correctly.
 248 macro_rules! write_tlv_fields {
 249         ($stream: expr, {$(($type: expr, $field: expr)),*}, {$(($optional_type: expr, $optional_field: expr)),*}) => {
 250                 encode_varint_length_prefixed_tlv!($stream, {$(($type, $field)),*} , {$(($optional_type, $optional_field)),*});
 251         }
 252 }
 253
 254 /// Reads a prefix added by write_ver_prefix!(), above. Takes the current version of the
 255 /// serialization logic for this object. This is compared against the
 256 /// $min_version_that_can_read_this added by write_ver_prefix!().
 257 macro_rules! read_ver_prefix {
 258         ($stream: expr, $this_version: expr) => { {
 259                 let ver: u8 = Readable::read($stream)?;
 260                 let min_ver: u8 = Readable::read($stream)?;
 261                 if min_ver > $this_version {
 262                         return Err(DecodeError::UnknownVersion);
 263                 }
 264                 ver
 265         } }
 266 }
 267
 268 /// Reads a suffix added by write_tlv_fields.
 269 macro_rules! read_tlv_fields {
 270         ($stream: expr, {$(($reqtype: expr, $reqfield: ident)),*}, {$(($type: expr, $field: ident)),*}) => { {
 271                 let tlv_len = ::util::ser::BigSize::read($stream)?;
 272                 let mut rd = ::util::ser::FixedLengthReader::new($stream, tlv_len.0);
 273                 decode_tlv!(&mut rd, {$(($reqtype, $reqfield)),*}, {$(($type, $field)),*});
 274                 rd.eat_remaining().map_err(|_| DecodeError::ShortRead)?;
 275         } }
 276 }
 277
 278 #[cfg(test)]
 279 mod tests {
 280         use std::io::{Cursor, Read};
 281         use ln::msgs::DecodeError;
 282         use util::ser::{Readable, Writeable, HighZeroBytesDroppedVarInt, VecWriter};
 283         use bitcoin::secp256k1::PublicKey;
 284
 285         // The BOLT TLV test cases don't include any tests which use our "required-value" logic since
 286         // the encoding layer in the BOLTs has no such concept, though it makes our macros easier to
 287         // work with so they're baked into the decoder. Thus, we have a few additional tests below
 288         fn tlv_reader(s: &[u8]) -> Result<(u64, u32, Option<u32>), DecodeError> {
 289                 let mut s = Cursor::new(s);
 290                 let mut a: u64 = 0;
 291                 let mut b: u32 = 0;
 292                 let mut c: Option<u32> = None;
 293                 decode_tlv!(&mut s, {(2, a), (3, b)}, {(4, c)});
 294                 Ok((a, b, c))
 295         }
 296
 297         #[test]
 298         fn tlv_v_short_read() {
 299                 // We only expect a u32 for type 3 (which we are given), but the L says its 8 bytes.
 300                 if let Err(DecodeError::ShortRead) = tlv_reader(&::hex::decode(
 301                                 concat!("0100", "0208deadbeef1badbeef", "0308deadbeef")
 302                                 ).unwrap()[..]) {
 303                 } else { panic!(); }
 304         }
 305
 306         #[test]
 307         fn tlv_types_out_of_order() {
 308                 if let Err(DecodeError::InvalidValue) = tlv_reader(&::hex::decode(
 309                                 concat!("0100", "0304deadbeef", "0208deadbeef1badbeef")
 310                                 ).unwrap()[..]) {
 311                 } else { panic!(); }
 312                 // ...even if its some field we don't understand
 313                 if let Err(DecodeError::InvalidValue) = tlv_reader(&::hex::decode(
 314                                 concat!("0208deadbeef1badbeef", "0100", "0304deadbeef")
 315                                 ).unwrap()[..]) {
 316                 } else { panic!(); }
 317         }
 318
 319         #[test]
 320         fn tlv_req_type_missing_or_extra() {
 321                 // It's also bad if they included even fields we don't understand
 322                 if let Err(DecodeError::UnknownRequiredFeature) = tlv_reader(&::hex::decode(
 323                                 concat!("0100", "0208deadbeef1badbeef", "0304deadbeef", "0600")
 324                                 ).unwrap()[..]) {
 325                 } else { panic!(); }
 326                 // ... or if they're missing fields we need
 327                 if let Err(DecodeError::InvalidValue) = tlv_reader(&::hex::decode(
 328                                 concat!("0100", "0208deadbeef1badbeef")
 329                                 ).unwrap()[..]) {
 330                 } else { panic!(); }
 331                 // ... even if that field is even
 332                 if let Err(DecodeError::InvalidValue) = tlv_reader(&::hex::decode(
 333                                 concat!("0304deadbeef", "0500")
 334                                 ).unwrap()[..]) {
 335                 } else { panic!(); }
 336         }
 337
 338         #[test]
 339         fn tlv_simple_good_cases() {
 340                 assert_eq!(tlv_reader(&::hex::decode(
 341                                 concat!("0208deadbeef1badbeef", "03041bad1dea")
 342                                 ).unwrap()[..]).unwrap(),
 343                         (0xdeadbeef1badbeef, 0x1bad1dea, None));
 344                 assert_eq!(tlv_reader(&::hex::decode(
 345                                 concat!("0208deadbeef1badbeef", "03041bad1dea", "040401020304")
 346                                 ).unwrap()[..]).unwrap(),
 347                         (0xdeadbeef1badbeef, 0x1bad1dea, Some(0x01020304)));
 348         }
 349
 350         impl Readable for (PublicKey, u64, u64) {
 351                 #[inline]
 352                 fn read<R: Read>(reader: &mut R) -> Result<(PublicKey, u64, u64), DecodeError> {
 353                         Ok((Readable::read(reader)?, Readable::read(reader)?, Readable::read(reader)?))
 354                 }
 355         }
 356
 357         // BOLT TLV test cases
 358         fn tlv_reader_n1(s: &[u8]) -> Result<(Option<HighZeroBytesDroppedVarInt<u64>>, Option<u64>, Option<(PublicKey, u64, u64)>, Option<u16>), DecodeError> {
 359                 let mut s = Cursor::new(s);
 360                 let mut tlv1: Option<HighZeroBytesDroppedVarInt<u64>> = None;
 361                 let mut tlv2: Option<u64> = None;
 362                 let mut tlv3: Option<(PublicKey, u64, u64)> = None;
 363                 let mut tlv4: Option<u16> = None;
 364                 decode_tlv!(&mut s, {}, {(1, tlv1), (2, tlv2), (3, tlv3), (254, tlv4)});
 365                 Ok((tlv1, tlv2, tlv3, tlv4))
 366         }
 367
 368         #[test]
 369         fn bolt_tlv_bogus_stream() {
 370                 macro_rules! do_test {
 371                         ($stream: expr, $reason: ident) => {
 372                                 if let Err(DecodeError::$reason) = tlv_reader_n1(&::hex::decode($stream).unwrap()[..]) {
 373                                 } else { panic!(); }
 374                         }
 375                 }
 376
 377                 // TLVs from the BOLT test cases which should not decode as either n1 or n2
 378                 do_test!(concat!("fd01"), ShortRead);
 379                 do_test!(concat!("fd0001", "00"), InvalidValue);
 380                 do_test!(concat!("fd0101"), ShortRead);
 381                 do_test!(concat!("0f", "fd"), ShortRead);
 382                 do_test!(concat!("0f", "fd26"), ShortRead);
 383                 do_test!(concat!("0f", "fd2602"), ShortRead);
 384                 do_test!(concat!("0f", "fd0001", "00"), InvalidValue);
 385                 do_test!(concat!("0f", "fd0201", "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"), ShortRead);
 386
 387                 do_test!(concat!("12", "00"), UnknownRequiredFeature);
 388                 do_test!(concat!("fd0102", "00"), UnknownRequiredFeature);
 389                 do_test!(concat!("fe01000002", "00"), UnknownRequiredFeature);
 390                 do_test!(concat!("ff0100000000000002", "00"), UnknownRequiredFeature);
 391         }
 392
 393         #[test]
 394         fn bolt_tlv_bogus_n1_stream() {
 395                 macro_rules! do_test {
 396                         ($stream: expr, $reason: ident) => {
 397                                 if let Err(DecodeError::$reason) = tlv_reader_n1(&::hex::decode($stream).unwrap()[..]) {
 398                                 } else { panic!(); }
 399                         }
 400                 }
 401
 402                 // TLVs from the BOLT test cases which should not decode as n1
 403                 do_test!(concat!("01", "09", "ffffffffffffffffff"), InvalidValue);
 404                 do_test!(concat!("01", "01", "00"), InvalidValue);
 405                 do_test!(concat!("01", "02", "0001"), InvalidValue);
 406                 do_test!(concat!("01", "03", "000100"), InvalidValue);
 407                 do_test!(concat!("01", "04", "00010000"), InvalidValue);
 408                 do_test!(concat!("01", "05", "0001000000"), InvalidValue);
 409                 do_test!(concat!("01", "06", "000100000000"), InvalidValue);
 410                 do_test!(concat!("01", "07", "00010000000000"), InvalidValue);
 411                 do_test!(concat!("01", "08", "0001000000000000"), InvalidValue);
 412                 do_test!(concat!("02", "07", "01010101010101"), ShortRead);
 413                 do_test!(concat!("02", "09", "010101010101010101"), InvalidValue);
 414                 do_test!(concat!("03", "21", "023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb"), ShortRead);
 415                 do_test!(concat!("03", "29", "023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb0000000000000001"), ShortRead);
 416                 do_test!(concat!("03", "30", "023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb000000000000000100000000000001"), ShortRead);
 417                 do_test!(concat!("03", "31", "043da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb00000000000000010000000000000002"), InvalidValue);
 418                 do_test!(concat!("03", "32", "023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb0000000000000001000000000000000001"), InvalidValue);
 419                 do_test!(concat!("fd00fe", "00"), ShortRead);
 420                 do_test!(concat!("fd00fe", "01", "01"), ShortRead);
 421                 do_test!(concat!("fd00fe", "03", "010101"), InvalidValue);
 422                 do_test!(concat!("00", "00"), UnknownRequiredFeature);
 423
 424                 do_test!(concat!("02", "08", "0000000000000226", "01", "01", "2a"), InvalidValue);
 425                 do_test!(concat!("02", "08", "0000000000000231", "02", "08", "0000000000000451"), InvalidValue);
 426                 do_test!(concat!("1f", "00", "0f", "01", "2a"), InvalidValue);
 427                 do_test!(concat!("1f", "00", "1f", "01", "2a"), InvalidValue);
 428
 429                 // The last BOLT test modified to not require creating a new decoder for one trivial test.
 430                 do_test!(concat!("ffffffffffffffffff", "00", "01", "00"), InvalidValue);
 431         }
 432
 433         #[test]
 434         fn bolt_tlv_valid_n1_stream() {
 435                 macro_rules! do_test {
 436                         ($stream: expr, $tlv1: expr, $tlv2: expr, $tlv3: expr, $tlv4: expr) => {
 437                                 if let Ok((tlv1, tlv2, tlv3, tlv4)) = tlv_reader_n1(&::hex::decode($stream).unwrap()[..]) {
 438                                         assert_eq!(tlv1.map(|v| v.0), $tlv1);
 439                                         assert_eq!(tlv2, $tlv2);
 440                                         assert_eq!(tlv3, $tlv3);
 441                                         assert_eq!(tlv4, $tlv4);
 442                                 } else { panic!(); }
 443                         }
 444                 }
 445
 446                 do_test!(concat!(""), None, None, None, None);
 447                 do_test!(concat!("21", "00"), None, None, None, None);
 448                 do_test!(concat!("fd0201", "00"), None, None, None, None);
 449                 do_test!(concat!("fd00fd", "00"), None, None, None, None);
 450                 do_test!(concat!("fd00ff", "00"), None, None, None, None);
 451                 do_test!(concat!("fe02000001", "00"), None, None, None, None);
 452                 do_test!(concat!("ff0200000000000001", "00"), None, None, None, None);
 453
 454                 do_test!(concat!("01", "00"), Some(0), None, None, None);
 455                 do_test!(concat!("01", "01", "01"), Some(1), None, None, None);
 456                 do_test!(concat!("01", "02", "0100"), Some(256), None, None, None);
 457                 do_test!(concat!("01", "03", "010000"), Some(65536), None, None, None);
 458                 do_test!(concat!("01", "04", "01000000"), Some(16777216), None, None, None);
 459                 do_test!(concat!("01", "05", "0100000000"), Some(4294967296), None, None, None);
 460                 do_test!(concat!("01", "06", "010000000000"), Some(1099511627776), None, None, None);
 461                 do_test!(concat!("01", "07", "01000000000000"), Some(281474976710656), None, None, None);
 462                 do_test!(concat!("01", "08", "0100000000000000"), Some(72057594037927936), None, None, None);
 463                 do_test!(concat!("02", "08", "0000000000000226"), None, Some((0 << 30) | (0 << 5) | (550 << 0)), None, None);
 464                 do_test!(concat!("03", "31", "023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb00000000000000010000000000000002"),
 465                         None, None, Some((
 466                                 PublicKey::from_slice(&::hex::decode("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb").unwrap()[..]).unwrap(), 1, 2)),
 467                         None);
 468                 do_test!(concat!("fd00fe", "02", "0226"), None, None, None, Some(550));
 469         }
 470
 471         fn do_simple_test_tlv_write() -> Result<(), ::std::io::Error> {
 472                 let mut stream = VecWriter(Vec::new());
 473
 474                 stream.0.clear();
 475                 encode_varint_length_prefixed_tlv!(&mut stream, { (1, 1u8) }, { (42, None::<u64>) });
 476                 assert_eq!(stream.0, ::hex::decode("03010101").unwrap());
 477
 478                 stream.0.clear();
 479                 encode_varint_length_prefixed_tlv!(&mut stream, { }, { (1, Some(1u8)) });
 480                 assert_eq!(stream.0, ::hex::decode("03010101").unwrap());
 481
 482                 stream.0.clear();
 483                 encode_varint_length_prefixed_tlv!(&mut stream, { (4, 0xabcdu16) }, { (42, None::<u64>) });
 484                 assert_eq!(stream.0, ::hex::decode("040402abcd").unwrap());
 485
 486                 stream.0.clear();
 487                 encode_varint_length_prefixed_tlv!(&mut stream, { (0xff, 0xabcdu16) }, { (42, None::<u64>) });
 488                 assert_eq!(stream.0, ::hex::decode("06fd00ff02abcd").unwrap());
 489
 490                 stream.0.clear();
 491                 encode_varint_length_prefixed_tlv!(&mut stream, { (0, 1u64), (0xff, HighZeroBytesDroppedVarInt(0u64)) }, { (42, None::<u64>) });
 492                 assert_eq!(stream.0, ::hex::decode("0e00080000000000000001fd00ff00").unwrap());
 493
 494                 stream.0.clear();
 495                 encode_varint_length_prefixed_tlv!(&mut stream, { (0xff, HighZeroBytesDroppedVarInt(0u64)) }, { (0, Some(1u64)) });
 496                 assert_eq!(stream.0, ::hex::decode("0e00080000000000000001fd00ff00").unwrap());
 497
 498                 Ok(())
 499         }
 500
 501         #[test]
 502         fn simple_test_tlv_write() {
 503                 do_simple_test_tlv_write().unwrap();
 504         }
 505 }