fix(addresses): Skip error on pointer address overflow (#178)

pallas-addresses/src/lib.rs

@@ -821,4 +821,10 @@ mod tests {
 
         assert_eq!(addr.to_bech32().unwrap(), MAINNET_TEST_VECTORS[0].0);
     }
+
+    #[test]
+    fn test_minted_invalid_pointed_address() {
+        let addr = Address::from_hex("40C19D7D05E90EEB6394B53313FE79D47077DE33068C6B813BBE5C9D5681FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7F81FFFFFFFFFFFFFFFF7F81FFFFFFFFFFFFFFFF7F");
+        assert!(matches!(addr, Ok(Address::Shelley(_))));
+    }
 }

pallas-addresses/src/varuint.rs

@@ -27,7 +27,14 @@ pub fn read(cursor: &mut Cursor<&[u8]>) -> Result<u64, Error> {
         output = (output << 7) | (byte & 0x7F) as u128;
 
         if output > u64::MAX.into() {
-            return Err(Error::VarUintOverflow);
+            // Strictly speaking, if we find a value above max u64, an overflow error should
+            // be returned. The problem is that testnet has some invalid address values
+            // somehow minted in valid blocks. The node and many explorers, instead of
+            // throwing an error, return max u64 as a workaround. We copy the same behavior
+            // to maintain homogeneity.
+            //
+            // return Err(Error::VarUintOverflow);
+            return Ok(u64::MAX);
         }
 
         if (byte & 0x80) == 0 {

pallas-primitives/src/alonzo/model.rs

@@ -1443,6 +1443,8 @@ mod tests {
             include_str!("../../../test_data/alonzo22.block"),
             // peculiar block with indef byte array in plutus data
             include_str!("../../../test_data/alonzo23.block"),
+            // peculiar block with invalid address (pointer overflow)
+            include_str!("../../../test_data/alonzo27.block"),
         ];
 
         for (idx, block_str) in test_blocks.iter().enumerate() {