226 lines
8.0 KiB
Rust
226 lines
8.0 KiB
Rust
// SPDX-License-Identifier: CC0-1.0
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//! Internal macros.
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//!
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//! Macros meant to be used inside the Rust Bitcoin library.
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//!
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macro_rules! impl_consensus_encoding {
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($thing:ident, $($field:ident),+) => (
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impl $crate::consensus::Encodable for $thing {
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#[inline]
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fn consensus_encode<R: $crate::io::Write + ?Sized>(
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&self,
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r: &mut R,
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) -> core::result::Result<usize, $crate::io::Error> {
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let mut len = 0;
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$(len += self.$field.consensus_encode(r)?;)+
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Ok(len)
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}
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}
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impl $crate::consensus::Decodable for $thing {
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#[inline]
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fn consensus_decode_from_finite_reader<R: $crate::io::BufRead + ?Sized>(
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r: &mut R,
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) -> core::result::Result<$thing, $crate::consensus::encode::Error> {
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Ok($thing {
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$($field: $crate::consensus::Decodable::consensus_decode_from_finite_reader(r)?),+
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})
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}
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#[inline]
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fn consensus_decode<R: $crate::io::BufRead + ?Sized>(
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r: &mut R,
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) -> core::result::Result<$thing, $crate::consensus::encode::Error> {
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let mut r = r.take($crate::consensus::encode::MAX_VEC_SIZE as u64);
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Ok($thing {
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$($field: $crate::consensus::Decodable::consensus_decode(&mut r)?),+
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})
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}
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}
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);
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}
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pub(crate) use impl_consensus_encoding;
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/// Implements several traits for byte-based newtypes.
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/// Implements:
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/// - core::fmt::LowerHex
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/// - core::fmt::UpperHex
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/// - core::fmt::Display
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/// - core::str::FromStr
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macro_rules! impl_bytes_newtype {
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($t:ident, $len:literal) => {
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impl $t {
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/// Returns a reference the underlying bytes.
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#[inline]
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pub fn as_bytes(&self) -> &[u8; $len] { &self.0 }
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/// Returns the underlying bytes.
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#[inline]
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pub fn to_bytes(self) -> [u8; $len] {
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// We rely on `Copy` being implemented for $t so conversion
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// methods use the correct Rust naming conventions.
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fn check_copy<T: Copy>() {}
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check_copy::<$t>();
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self.0
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}
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/// Creates `Self` from a hex string.
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pub fn from_hex(s: &str) -> Result<Self, hex::HexToArrayError> {
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Ok($t($crate::hex::FromHex::from_hex(s)?))
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}
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}
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impl core::fmt::LowerHex for $t {
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fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
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use $crate::hex::{display, Case};
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display::fmt_hex_exact!(f, $len, &self.0, Case::Lower)
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}
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}
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impl core::fmt::UpperHex for $t {
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fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
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use $crate::hex::{display, Case};
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display::fmt_hex_exact!(f, $len, &self.0, Case::Upper)
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}
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}
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impl core::fmt::Display for $t {
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fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
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core::fmt::LowerHex::fmt(self, f)
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}
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}
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impl core::fmt::Debug for $t {
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fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
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core::fmt::LowerHex::fmt(self, f)
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}
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}
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impl core::str::FromStr for $t {
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type Err = $crate::hex::HexToArrayError;
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fn from_str(s: &str) -> core::result::Result<Self, Self::Err> { Self::from_hex(s) }
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}
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#[cfg(feature = "serde")]
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impl $crate::serde::Serialize for $t {
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fn serialize<S: $crate::serde::Serializer>(&self, s: S) -> core::result::Result<S::Ok, S::Error> {
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if s.is_human_readable() {
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s.collect_str(self)
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} else {
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s.serialize_bytes(&self[..])
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}
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}
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}
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#[cfg(feature = "serde")]
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impl<'de> $crate::serde::Deserialize<'de> for $t {
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fn deserialize<D: $crate::serde::Deserializer<'de>>(d: D) -> core::result::Result<$t, D::Error> {
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if d.is_human_readable() {
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struct HexVisitor;
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impl<'de> $crate::serde::de::Visitor<'de> for HexVisitor {
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type Value = $t;
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fn expecting(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
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f.write_str("an ASCII hex string")
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}
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fn visit_bytes<E>(self, v: &[u8]) -> core::result::Result<Self::Value, E>
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where
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E: $crate::serde::de::Error,
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{
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use $crate::serde::de::Unexpected;
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if let Ok(hex) = core::str::from_utf8(v) {
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core::str::FromStr::from_str(hex).map_err(E::custom)
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} else {
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return Err(E::invalid_value(Unexpected::Bytes(v), &self));
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}
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}
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fn visit_str<E>(self, hex: &str) -> core::result::Result<Self::Value, E>
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where
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E: $crate::serde::de::Error,
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{
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core::str::FromStr::from_str(hex).map_err(E::custom)
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}
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}
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d.deserialize_str(HexVisitor)
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} else {
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struct BytesVisitor;
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impl<'de> $crate::serde::de::Visitor<'de> for BytesVisitor {
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type Value = $t;
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fn expecting(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
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f.write_str("a bytestring")
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}
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fn visit_bytes<E>(self, v: &[u8]) -> core::result::Result<Self::Value, E>
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where
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E: $crate::serde::de::Error,
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{
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if v.len() != $len {
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Err(E::invalid_length(v.len(), &stringify!($len)))
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} else {
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let mut ret = [0; $len];
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ret.copy_from_slice(v);
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Ok($t(ret))
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}
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}
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}
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d.deserialize_bytes(BytesVisitor)
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}
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}
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}
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};
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}
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pub(crate) use impl_bytes_newtype;
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#[rustfmt::skip]
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macro_rules! impl_hashencode {
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($hashtype:ident) => {
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impl $crate::consensus::Encodable for $hashtype {
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fn consensus_encode<W: $crate::io::Write + ?Sized>(&self, w: &mut W) -> core::result::Result<usize, $crate::io::Error> {
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self.0.consensus_encode(w)
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}
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}
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impl $crate::consensus::Decodable for $hashtype {
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fn consensus_decode<R: $crate::io::BufRead + ?Sized>(r: &mut R) -> core::result::Result<Self, $crate::consensus::encode::Error> {
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use $crate::hashes::Hash;
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Ok(Self::from_byte_array(<<$hashtype as $crate::hashes::Hash>::Bytes>::consensus_decode(r)?))
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}
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}
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};
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}
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pub(crate) use impl_hashencode;
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#[rustfmt::skip]
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macro_rules! impl_asref_push_bytes {
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($($hashtype:ident),*) => {
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$(
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impl AsRef<$crate::blockdata::script::PushBytes> for $hashtype {
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fn as_ref(&self) -> &$crate::blockdata::script::PushBytes {
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use $crate::hashes::Hash;
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self.as_byte_array().into()
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}
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}
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impl From<$hashtype> for $crate::blockdata::script::PushBytesBuf {
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fn from(hash: $hashtype) -> Self {
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use $crate::hashes::Hash;
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hash.as_byte_array().into()
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}
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}
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)*
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};
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}
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pub(crate) use impl_asref_push_bytes;
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