463 lines
18 KiB
Rust
463 lines
18 KiB
Rust
// SPDX-License-Identifier: CC0-1.0
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#[macro_export]
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/// Adds hexadecimal formatting implementation of a trait `$imp` to a given type `$ty`.
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macro_rules! hex_fmt_impl(
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($reverse:expr, $ty:ident) => (
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$crate::hex_fmt_impl!($reverse, $ty, );
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);
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($reverse:expr, $ty:ident, $($gen:ident: $gent:ident),*) => (
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impl<$($gen: $gent),*> $crate::_export::_core::fmt::LowerHex for $ty<$($gen),*> {
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#[inline]
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fn fmt(&self, f: &mut $crate::_export::_core::fmt::Formatter) -> $crate::_export::_core::fmt::Result {
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if $reverse {
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$crate::_export::_core::fmt::LowerHex::fmt(&self.0.backward_hex(), f)
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} else {
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$crate::_export::_core::fmt::LowerHex::fmt(&self.0.forward_hex(), f)
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}
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}
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}
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impl<$($gen: $gent),*> $crate::_export::_core::fmt::UpperHex for $ty<$($gen),*> {
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#[inline]
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fn fmt(&self, f: &mut $crate::_export::_core::fmt::Formatter) -> $crate::_export::_core::fmt::Result {
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if $reverse {
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$crate::_export::_core::fmt::UpperHex::fmt(&self.0.backward_hex(), f)
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} else {
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$crate::_export::_core::fmt::UpperHex::fmt(&self.0.forward_hex(), f)
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}
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}
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}
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impl<$($gen: $gent),*> $crate::_export::_core::fmt::Display for $ty<$($gen),*> {
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#[inline]
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fn fmt(&self, f: &mut $crate::_export::_core::fmt::Formatter) -> $crate::_export::_core::fmt::Result {
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$crate::_export::_core::fmt::LowerHex::fmt(&self, f)
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}
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}
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impl<$($gen: $gent),*> $crate::_export::_core::fmt::Debug for $ty<$($gen),*> {
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#[inline]
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fn fmt(&self, f: &mut $crate::_export::_core::fmt::Formatter) -> $crate::_export::_core::fmt::Result {
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write!(f, "{:#}", self)
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}
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}
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);
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);
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/// Adds slicing traits implementations to a given type `$ty`
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#[macro_export]
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macro_rules! borrow_slice_impl(
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($ty:ident) => (
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$crate::borrow_slice_impl!($ty, );
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);
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($ty:ident, $($gen:ident: $gent:ident),*) => (
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impl<$($gen: $gent),*> $crate::_export::_core::borrow::Borrow<[u8]> for $ty<$($gen),*> {
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fn borrow(&self) -> &[u8] {
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&self[..]
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}
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}
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impl<$($gen: $gent),*> $crate::_export::_core::convert::AsRef<[u8]> for $ty<$($gen),*> {
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fn as_ref(&self) -> &[u8] {
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&self[..]
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}
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}
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)
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);
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macro_rules! engine_input_impl(
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() => (
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#[cfg(not(hashes_fuzz))]
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fn input(&mut self, mut inp: &[u8]) {
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while !inp.is_empty() {
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let buf_idx = self.length % <Self as crate::HashEngine>::BLOCK_SIZE;
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let rem_len = <Self as crate::HashEngine>::BLOCK_SIZE - buf_idx;
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let write_len = cmp::min(rem_len, inp.len());
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self.buffer[buf_idx..buf_idx + write_len]
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.copy_from_slice(&inp[..write_len]);
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self.length += write_len;
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if self.length % <Self as crate::HashEngine>::BLOCK_SIZE == 0 {
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self.process_block();
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}
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inp = &inp[write_len..];
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}
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}
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#[cfg(hashes_fuzz)]
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fn input(&mut self, inp: &[u8]) {
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for c in inp {
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self.buffer[0] ^= *c;
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}
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self.length += inp.len();
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}
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)
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);
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/// Creates a new newtype around a [`Hash`] type.
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///
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/// The syntax is similar to the usual tuple struct syntax:
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///
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/// ```
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/// # use bitcoin_hashes::{hash_newtype, sha256};
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/// hash_newtype! {
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/// /// Hash of `Foo`.
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/// pub struct MyNewtype(pub sha256::Hash);
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/// }
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/// ```
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///
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/// You can use any valid visibility specifier in place of `pub` or you can omit either or both, if
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/// you want the type or its field to be private.
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///
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/// Whether the hash is reversed or not when displaying depends on the inner type. However you can
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/// override it like this:
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///
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/// ```
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/// # use bitcoin_hashes::{hash_newtype, sha256};
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/// hash_newtype! {
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/// #[hash_newtype(backward)]
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/// struct MyNewtype(sha256::Hash);
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/// }
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/// ```
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///
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/// This will display the hash backwards regardless of what the inner type does. Use `forward`
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/// instead of `backward` to force displaying forward.
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///
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/// You can add arbitrary doc comments or other attributes to the struct or it's field. Note that
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/// the macro already derives [`Copy`], [`Clone`], [`Eq`], [`PartialEq`],
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/// [`Hash`](core::hash::Hash), [`Ord`], [`PartialOrd`]. With the `serde` feature on, this also adds
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/// `Serialize` and `Deserialize` implementations.
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///
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/// You can also define multiple newtypes within one macro call:
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///
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/// ```
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/// # use bitcoin_hashes::{hash_newtype, sha256, hash160};
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///
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/// hash_newtype! {
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/// /// My custom type 1
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/// pub struct Newtype1(sha256::Hash);
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///
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/// /// My custom type 2
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/// struct Newtype2(hash160::Hash);
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/// }
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/// ```
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///
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/// Note: the macro is internally recursive. If you use too many attributes (> 256 tokens) you may
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/// hit recursion limit. If you have so many attributes for a good reason, just raising the limit
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/// should be OK. Note however that attribute-processing part has to use [TT muncher] which has
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/// quadratic complexity, so having many attributes may blow up compile time. This should be rare.
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///
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/// [TT muncher]: https://danielkeep.github.io/tlborm/book/pat-incremental-tt-munchers.html
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///
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// Ever heard of legendary comments warning developers to not touch the code? Yep, here's another
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// one. The following code is written the way it is for some specific reasons. If you think you can
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// simplify it, I suggest spending your time elsewhere.
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//
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// If you looks at the code carefully you might ask these questions:
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//
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// * Why are attributes using `tt` and not `meta`?!
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// * Why are the macros split like that?!
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// * Why use recursion instead of `$()*`?
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//
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// None of these are here by accident. For some reason unknown to me, if you accept an argument to
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// macro with any fragment specifier other than `tt` it will **not** match any of the rules
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// requiring a specific token. Yep, I tried it, I literally got error that `hash_newtype` doesn't
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// match `hash_newtype`. So all input attributes must be `tt`.
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//
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// Originally I wanted to define a bunch of macros that would filter-out hash_type attributes. Then
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// I remembered (by seeing compiler error) that calling macros is not allowed inside attributes.
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// And no, you can't bypass it by calling a helper macro and passing "output of another macro" into
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// it. The whole macro gets passed, not the resulting value. So we have to generate the entire
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// attributes. And you can't just place an attribute-producing macro above struct - they are
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// considered separate items. This is not C.
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//
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// Thus struct is generated in a separate macro together with attributes. And since the macro needs
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// attributes as the input and I didn't want to create confusion by using `#[]` syntax *after*
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// struct, I opted to use `{}` as a separator. Yes, a separator is required because an attribute
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// may be composed of multiple token trees - that's the point of "double repetition".
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#[macro_export]
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macro_rules! hash_newtype {
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($($(#[$($type_attrs:tt)*])* $type_vis:vis struct $newtype:ident($(#[$field_attrs:tt])* $field_vis:vis $hash:path);)+) => {
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$(
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$($crate::hash_newtype_known_attrs!(#[ $($type_attrs)* ]);)*
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$crate::hash_newtype_struct! {
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$type_vis struct $newtype($(#[$field_attrs])* $field_vis $hash);
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$({ $($type_attrs)* })*
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}
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$crate::hex_fmt_impl!(<$newtype as $crate::Hash>::DISPLAY_BACKWARD, $newtype);
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$crate::serde_impl!($newtype, <$newtype as $crate::Hash>::LEN);
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$crate::borrow_slice_impl!($newtype);
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impl $newtype {
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/// Creates this wrapper type from the inner hash type.
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#[allow(unused)] // the user of macro may not need this
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pub fn from_raw_hash(inner: $hash) -> $newtype {
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$newtype(inner)
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}
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/// Returns the inner hash (sha256, sh256d etc.).
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#[allow(unused)] // the user of macro may not need this
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pub fn to_raw_hash(self) -> $hash {
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self.0
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}
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/// Returns a reference to the inner hash (sha256, sh256d etc.).
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#[allow(unused)] // the user of macro may not need this
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pub fn as_raw_hash(&self) -> &$hash {
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&self.0
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}
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}
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impl $crate::_export::_core::convert::From<$hash> for $newtype {
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fn from(inner: $hash) -> $newtype {
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// Due to rust 1.22 we have to use this instead of simple `Self(inner)`
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Self { 0: inner }
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}
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}
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impl $crate::_export::_core::convert::From<$newtype> for $hash {
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fn from(hashtype: $newtype) -> $hash {
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hashtype.0
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}
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}
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impl $crate::Hash for $newtype {
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type Engine = <$hash as $crate::Hash>::Engine;
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type Bytes = <$hash as $crate::Hash>::Bytes;
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const LEN: usize = <$hash as $crate::Hash>::LEN;
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const DISPLAY_BACKWARD: bool = $crate::hash_newtype_get_direction!($hash, $(#[$($type_attrs)*])*);
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fn engine() -> Self::Engine {
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<$hash as $crate::Hash>::engine()
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}
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fn from_engine(e: Self::Engine) -> Self {
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Self::from(<$hash as $crate::Hash>::from_engine(e))
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}
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#[inline]
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fn from_slice(sl: &[u8]) -> $crate::_export::_core::result::Result<$newtype, $crate::FromSliceError> {
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Ok($newtype(<$hash as $crate::Hash>::from_slice(sl)?))
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}
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#[inline]
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fn from_byte_array(bytes: Self::Bytes) -> Self {
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$newtype(<$hash as $crate::Hash>::from_byte_array(bytes))
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}
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#[inline]
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fn to_byte_array(self) -> Self::Bytes {
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self.0.to_byte_array()
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}
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#[inline]
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fn as_byte_array(&self) -> &Self::Bytes {
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self.0.as_byte_array()
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}
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#[inline]
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fn all_zeros() -> Self {
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let zeros = <$hash>::all_zeros();
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$newtype(zeros)
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}
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}
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impl $crate::_export::_core::str::FromStr for $newtype {
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type Err = $crate::hex::HexToArrayError;
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fn from_str(s: &str) -> $crate::_export::_core::result::Result<$newtype, Self::Err> {
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use $crate::hex::{FromHex, HexToBytesIter};
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use $crate::Hash;
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let inner: <$hash as Hash>::Bytes = if <Self as $crate::Hash>::DISPLAY_BACKWARD {
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FromHex::from_byte_iter(HexToBytesIter::new(s)?.rev())?
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} else {
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FromHex::from_byte_iter(HexToBytesIter::new(s)?)?
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};
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Ok($newtype(<$hash>::from_byte_array(inner)))
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}
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}
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impl $crate::_export::_core::convert::AsRef<[u8; <$hash as $crate::Hash>::LEN]> for $newtype {
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fn as_ref(&self) -> &[u8; <$hash as $crate::Hash>::LEN] {
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AsRef::<[u8; <$hash as $crate::Hash>::LEN]>::as_ref(&self.0)
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}
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}
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impl<I: $crate::_export::_core::slice::SliceIndex<[u8]>> $crate::_export::_core::ops::Index<I> for $newtype {
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type Output = I::Output;
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#[inline]
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fn index(&self, index: I) -> &Self::Output {
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&self.0[index]
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}
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}
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)+
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};
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}
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// Generates the struct only (no impls)
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//
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// This is a separate macro to make it more readable and have a separate interface that allows for
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// two groups of type attributes: processed and not-yet-processed ones (think about it like
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// computation via recursion). The macro recursively matches unprocessed attributes, popping them
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// one at a time and either ignoring them (`hash_newtype`) or appending them to the list of
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// processed attributes to be added to the struct.
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//
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// Once the list of not-yet-processed attributes is empty the struct is generated with processed
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// attributes added.
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#[doc(hidden)]
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#[macro_export]
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macro_rules! hash_newtype_struct {
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($(#[$other_attrs:meta])* $type_vis:vis struct $newtype:ident($(#[$field_attrs:meta])* $field_vis:vis $hash:path);) => {
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$(#[$other_attrs])*
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#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
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$type_vis struct $newtype($(#[$field_attrs])* $field_vis $hash);
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};
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($(#[$other_attrs:meta])* $type_vis:vis struct $newtype:ident($(#[$field_attrs:meta])* $field_vis:vis $hash:path); { hash_newtype($($ignore:tt)*) } $($type_attrs:tt)*) => {
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$crate::hash_newtype_struct! {
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$(#[$other_attrs])*
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$type_vis struct $newtype($(#[$field_attrs])* $field_vis $hash);
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$($type_attrs)*
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}
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};
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($(#[$other_attrs:meta])* $type_vis:vis struct $newtype:ident($(#[$field_attrs:meta])* $field_vis:vis $hash:path); { $other_attr:meta } $($type_attrs:tt)*) => {
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$crate::hash_newtype_struct! {
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$(#[$other_attrs])*
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#[$other_attr]
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$type_vis struct $newtype($(#[$field_attrs])* $field_vis $hash);
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$($type_attrs)*
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}
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};
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}
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// Extracts `hash_newtype(forward)` and `hash_newtype(backward)` attributes if any and turns them
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// into bool, defaulting to `DISPLAY_BACKWARD` of the wrapped type if the attribute is omitted.
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//
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// Once an appropriate attribute is found we pass the remaining ones into another macro to detect
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// duplicates/conflicts and report an error.
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//
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// FYI, no, we can't use a helper macro to first filter all `hash_newtype` attributes. We would be
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// attempting to match on macros instead. So we must write `hashe_newtype` in each branch.
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#[doc(hidden)]
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#[macro_export]
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macro_rules! hash_newtype_get_direction {
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($hash:ty, ) => { <$hash as $crate::Hash>::DISPLAY_BACKWARD };
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($hash:ty, #[hash_newtype(forward)] $($others:tt)*) => { { $crate::hash_newtype_forbid_direction!(forward, $($others)*); false } };
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($hash:ty, #[hash_newtype(backward)] $($others:tt)*) => { { $crate::hash_newtype_forbid_direction!(backward, $($others)*); true } };
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($hash:ty, #[$($ignore:tt)*] $($others:tt)*) => { $crate::hash_newtype_get_direction!($hash, $($others)*) };
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}
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// Reports an error if any of the attributes is `hash_newtype($direction)`.
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//
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// This is used for detection of duplicates/conflicts, see the macro above.
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#[doc(hidden)]
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#[macro_export]
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macro_rules! hash_newtype_forbid_direction {
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($direction:ident, ) => {};
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($direction:ident, #[hash_newtype(forward)] $(others:tt)*) => {
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compile_error!(concat!("Cannot set display direction to forward: ", stringify!($direction), " was already specified"));
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};
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($direction:ident, #[hash_newtype(backward)] $(others:tt)*) => {
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compile_error!(concat!("Cannot set display direction to backward: ", stringify!($direction), " was already specified"));
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};
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($direction:ident, #[$($ignore:tt)*] $(#[$others:tt])*) => {
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$crate::hash_newtype_forbid_direction!($direction, $(#[$others])*)
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};
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}
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// Checks (at compile time) that all `hash_newtype` attributes are known.
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//
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// An unknown attribute could be a typo that could cause problems - e.g. wrong display direction if
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// it's missing. To prevent this, we call this macro above. The macro produces nothing unless an
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// unknown attribute is found in which case it produces `compile_error!`.
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#[doc(hidden)]
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#[macro_export]
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macro_rules! hash_newtype_known_attrs {
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(#[hash_newtype(forward)]) => {};
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(#[hash_newtype(backward)]) => {};
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(#[hash_newtype($($unknown:tt)*)]) => { compile_error!(concat!("Unrecognized attribute ", stringify!($($unknown)*))); };
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($($ignore:tt)*) => {};
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}
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#[cfg(test)]
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mod test {
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use crate::{sha256, Hash};
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#[test]
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fn hash_as_ref_array() {
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let hash = sha256::Hash::hash(&[3, 50]);
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let r = AsRef::<[u8; 32]>::as_ref(&hash);
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assert_eq!(r, hash.as_byte_array());
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}
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#[test]
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fn hash_as_ref_slice() {
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let hash = sha256::Hash::hash(&[3, 50]);
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let r = AsRef::<[u8]>::as_ref(&hash);
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assert_eq!(r, hash.as_byte_array());
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}
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#[test]
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fn hash_borrow() {
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use core::borrow::Borrow;
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let hash = sha256::Hash::hash(&[3, 50]);
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let borrowed: &[u8] = hash.borrow();
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assert_eq!(borrowed, hash.as_byte_array());
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}
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hash_newtype! {
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/// Test hash.
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struct TestHash(crate::sha256d::Hash);
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}
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#[test]
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fn display() {
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let want = "0000000000000000000000000000000000000000000000000000000000000000";
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let got = format!("{}", TestHash::all_zeros());
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assert_eq!(got, want)
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}
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#[test]
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fn display_alternate() {
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let want = "0x0000000000000000000000000000000000000000000000000000000000000000";
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let got = format!("{:#}", TestHash::all_zeros());
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assert_eq!(got, want)
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}
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#[test]
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fn lower_hex() {
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let want = "0000000000000000000000000000000000000000000000000000000000000000";
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let got = format!("{:x}", TestHash::all_zeros());
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assert_eq!(got, want)
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}
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#[test]
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fn lower_hex_alternate() {
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let want = "0x0000000000000000000000000000000000000000000000000000000000000000";
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|
let got = format!("{:#x}", TestHash::all_zeros());
|
|
assert_eq!(got, want)
|
|
}
|
|
|
|
#[test]
|
|
fn inner_hash_as_ref_array() {
|
|
let hash = TestHash::all_zeros();
|
|
let r = AsRef::<[u8; 32]>::as_ref(&hash);
|
|
assert_eq!(r, hash.as_byte_array());
|
|
}
|
|
|
|
#[test]
|
|
fn inner_hash_as_ref_slice() {
|
|
let hash = TestHash::all_zeros();
|
|
let r = AsRef::<[u8]>::as_ref(&hash);
|
|
assert_eq!(r, hash.as_byte_array());
|
|
}
|
|
}
|