tests: Fuzz additional functions in the hex fuzzing harness

src/test/fuzz/hex.cpp

@@ -2,8 +2,12 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <core_io.h>
+#include <primitives/block.h>
+#include <rpc/util.h>
 #include <test/fuzz/fuzz.h>
-
+#include <uint256.h>
+#include <univalue.h>
 #include <util/strencodings.h>
 
 #include <cassert>
@@ -19,4 +23,14 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     if (IsHex(random_hex_string)) {
         assert(ToLower(random_hex_string) == hex_data);
     }
+    (void)IsHexNumber(random_hex_string);
+    uint256 result;
+    (void)ParseHashStr(random_hex_string, result);
+    (void)uint256S(random_hex_string);
+    try {
+        (void)HexToPubKey(random_hex_string);
+    } catch (const UniValue&) {
+    }
+    CBlockHeader block_header;
+    (void)DecodeHexBlockHeader(block_header, random_hex_string);
 }