global: one big snapshot

crates/brk_structs/src/structs/blockhashprefix.rs

@@ -0,0 +1,54 @@
+use byteview::ByteView;
+use derive_deref::Deref;
+use zerocopy::{FromBytes, IntoBytes};
+use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
+
+use crate::copy_first_8bytes;
+
+use super::BlockHash;
+
+#[derive(
+    Debug,
+    Deref,
+    Clone,
+    Copy,
+    PartialEq,
+    Eq,
+    PartialOrd,
+    Ord,
+    FromBytes,
+    Immutable,
+    IntoBytes,
+    KnownLayout,
+)]
+pub struct BlockHashPrefix([u8; 8]);
+
+impl From<BlockHash> for BlockHashPrefix {
+    fn from(value: BlockHash) -> Self {
+        Self::from(&value)
+    }
+}
+
+impl From<&BlockHash> for BlockHashPrefix {
+    fn from(value: &BlockHash) -> Self {
+        Self(copy_first_8bytes(&value[..]).unwrap())
+    }
+}
+
+impl From<ByteView> for BlockHashPrefix {
+    fn from(value: ByteView) -> Self {
+        Self::read_from_bytes(&value).unwrap()
+    }
+}
+
+impl From<&BlockHashPrefix> for ByteView {
+    fn from(value: &BlockHashPrefix) -> Self {
+        Self::new(value.as_bytes())
+    }
+}
+
+impl From<BlockHashPrefix> for ByteView {
+    fn from(value: BlockHashPrefix) -> Self {
+        Self::from(&value)
+    }
+}