feat: impl Encode Decode for alloy_primitves::Bloom (#30)

* feat: impl Encode Decode alloy_primitves::Bloom

* Some basic tests

* Fix long bytes lengths

---------

Co-authored-by: Michael Sproul <michael@sigmaprime.io>

ssz/src/decode/impls.rs

@@ -1,6 +1,6 @@
 use super::*;
 use crate::decode::try_from_iter::{TryCollect, TryFromIter};
-use alloy_primitives::{Address, Bytes, FixedBytes, U128, U256};
+use alloy_primitives::{Address, Bloom, Bytes, FixedBytes, U128, U256};
 use core::num::NonZeroUsize;
 use itertools::process_results;
 use smallvec::SmallVec;
@@ -320,6 +320,27 @@ impl<const N: usize> Decode for FixedBytes<N> {
     }
 }
 
+impl Decode for Bloom {
+    fn is_ssz_fixed_len() -> bool {
+        true
+    }
+
+    fn ssz_fixed_len() -> usize {
+        256
+    }
+
+    fn from_ssz_bytes(bytes: &[u8]) -> Result<Self, DecodeError> {
+        let len = bytes.len();
+        let expected = <Self as Decode>::ssz_fixed_len();
+
+        if len != expected {
+            Err(DecodeError::InvalidByteLength { len, expected })
+        } else {
+            Ok(Self::from_slice(bytes))
+        }
+    }
+}
+
 impl Decode for U256 {
     fn is_ssz_fixed_len() -> bool {
         true

ssz/src/encode/impls.rs

@@ -1,5 +1,5 @@
 use super::*;
-use alloy_primitives::{Address, Bytes, FixedBytes, U128, U256};
+use alloy_primitives::{Address, Bloom, Bytes, FixedBytes, U128, U256};
 use core::num::NonZeroUsize;
 use smallvec::SmallVec;
 use std::collections::{BTreeMap, BTreeSet};
@@ -454,6 +454,33 @@ impl<const N: usize> Encode for FixedBytes<N> {
     }
 }
 
+impl Encode for Bloom {
+    #[inline]
+    fn is_ssz_fixed_len() -> bool {
+        true
+    }
+
+    #[inline]
+    fn ssz_bytes_len(&self) -> usize {
+        256
+    }
+
+    #[inline]
+    fn ssz_fixed_len() -> usize {
+        256
+    }
+
+    #[inline]
+    fn ssz_append(&self, buf: &mut Vec<u8>) {
+        buf.extend_from_slice(&self.0 .0);
+    }
+
+    #[inline]
+    fn as_ssz_bytes(&self) -> Vec<u8> {
+        self.0.to_vec()
+    }
+}
+
 impl Encode for Bytes {
     #[inline]
     fn is_ssz_fixed_len() -> bool {

ssz/tests/tests.rs

@@ -1,4 +1,4 @@
-use alloy_primitives::{Address, Bytes, B256, U128, U256};
+use alloy_primitives::{Address, Bloom, Bytes, B256, U128, U256};
 use ssz::{Decode, DecodeError, Encode};
 use ssz_derive::{Decode, Encode};
 use std::num::NonZeroUsize;
@@ -540,6 +540,26 @@ mod round_trip {
         let data = vec![(48u8, Some(0u64)), (0u8, None), (u8::MAX, Some(u64::MAX))];
         round_trip(data);
     }
+
+    #[test]
+    fn bloom() {
+        let data = vec![
+            Bloom::ZERO,
+            Bloom::with_last_byte(5),
+            Bloom::repeat_byte(73),
+        ];
+        round_trip(data);
+    }
+
+    #[test]
+    fn vec_bloom() {
+        let data = vec![
+            vec![Bloom::ZERO, Bloom::ZERO, Bloom::with_last_byte(5)],
+            vec![],
+            vec![Bloom::repeat_byte(73), Bloom::repeat_byte(72)],
+        ];
+        round_trip(data);
+    }
 }
 
 /// Decode tests that are expected to fail.
@@ -560,7 +580,13 @@ mod decode_fail {
 
     #[test]
     fn hash256() {
-        let long_bytes = vec![0xff; 257];
+        let long_bytes = vec![0xff; 33];
         assert!(B256::from_ssz_bytes(&long_bytes).is_err());
     }
+
+    #[test]
+    fn bloom() {
+        let long_bytes = vec![0xff; 257];
+        assert!(Bloom::from_ssz_bytes(&long_bytes).is_err());
+    }
 }