From 58710dfb9139d3411cd6b1e4aaddec799075f101 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vojt=C4=9Bch=20Toman?= <cry.wolf@centrum.cz>
Date: Sat, 25 Nov 2023 23:26:57 +0100
Subject: [PATCH] Implement LowerHex and UpperHex for CompactTarget

---
 bitcoin/src/pow.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/bitcoin/src/pow.rs b/bitcoin/src/pow.rs
index cc25654a..26fa7d60 100644
--- a/bitcoin/src/pow.rs
+++ b/bitcoin/src/pow.rs
@@ -306,6 +306,16 @@ impl Decodable for CompactTarget {
     }
 }
 
+impl LowerHex for CompactTarget {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { LowerHex::fmt(&self.0, f) }
+}
+
+impl UpperHex for CompactTarget {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { UpperHex::fmt(&self.0, f) }
+}
+
 /// Big-endian 256 bit integer type.
 // (high, low): u.0 contains the high bits, u.1 contains the low bits.
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
@@ -1538,6 +1548,12 @@ mod tests {
         assert!(result.is_err());
     }
 
+    #[test]
+    fn compact_target_lower_hex_and_upper_hex() {
+        assert_eq!(format!("{:08x}", CompactTarget(0x01D0F456)), "01d0f456");
+        assert_eq!(format!("{:08X}", CompactTarget(0x01d0f456)), "01D0F456");
+    }
+
     #[test]
     fn target_from_compact() {
         // (nBits, target)