1  // Copyright (c) 2020-present The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <consensus/amount.h>
 6  #include <policy/feerate.h>
 7  #include <test/fuzz/FuzzedDataProvider.h>
 8  #include <test/fuzz/fuzz.h>
 9  #include <test/fuzz/util.h>
10  
11  #include <cstdint>
12  #include <limits>
13  #include <string>
14  #include <vector>
15  
16  FUZZ_TARGET(fee_rate)
17  {
18      FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
19      const CAmount satoshis_per_k = ConsumeMoney(fuzzed_data_provider);
20      const CFeeRate fee_rate{satoshis_per_k};
21  
22      (void)fee_rate.GetFeePerK();
23      const auto bytes = fuzzed_data_provider.ConsumeIntegralInRange<int32_t>(0, std::numeric_limits<int32_t>::max());
24      if (!MultiplicationOverflow(int64_t{bytes}, satoshis_per_k)) {
25          (void)fee_rate.GetFee(bytes);
26      }
27      (void)fee_rate.ToString();
28  
29      const CAmount another_satoshis_per_k = ConsumeMoney(fuzzed_data_provider);
30      CFeeRate larger_fee_rate{another_satoshis_per_k};
31      larger_fee_rate += fee_rate;
32      if (satoshis_per_k != 0 && another_satoshis_per_k != 0) {
33          assert(fee_rate < larger_fee_rate);
34          assert(!(fee_rate > larger_fee_rate));
35          assert(!(fee_rate == larger_fee_rate));
36          assert(fee_rate <= larger_fee_rate);
37          assert(!(fee_rate >= larger_fee_rate));
38          assert(fee_rate != larger_fee_rate);
39      }
40  }