brk: first commit

_src/structs/txout_index.rs

@@ -0,0 +1,34 @@
+use allocative::Allocative;
+use bincode::{Decode, Encode};
+use snkrj::{direct_repr, Storable, UnsizedStorable};
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Encode, Decode, Allocative)]
+pub struct TxoutIndex {
+    pub tx_index: u32,
+    pub vout: u16,
+}
+direct_repr!(TxoutIndex);
+
+const SHIFT: u64 = 16;
+const AND: u64 = (1 << SHIFT) - 1;
+
+impl TxoutIndex {
+    #[inline(always)]
+    pub fn new(tx_index: u32, vout: u16) -> Self {
+        Self { tx_index, vout }
+    }
+
+    #[inline(always)]
+    pub fn as_u64(&self) -> u64 {
+        ((self.tx_index as u64) << SHIFT) + self.vout as u64
+    }
+}
+
+impl From<u64> for TxoutIndex {
+    fn from(value: u64) -> Self {
+        Self {
+            tx_index: (value >> SHIFT) as u32,
+            vout: (value & AND) as u16,
+        }
+    }
+}