text: // Copyright (c) 2020 The Crown Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <optional>
  #include <pubkey.h>
  #include <script/descriptor.h>
  #include <test/fuzz/FuzzedDataProvider.h>
  #include <test/fuzz/fuzz.h>
  #include <test/fuzz/util.h>
  
  #include <cstdint>
  #include <string>
  #include <vector>
  
  void test_one_input(const std::vector<uint8_t>& buffer)
  {
      FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
      DescriptorCache descriptor_cache;
      while (fuzzed_data_provider.ConsumeBool()) {
          const std::vector<uint8_t> code = fuzzed_data_provider.ConsumeBytes<uint8_t>(BIP32_EXTKEY_SIZE);
          if (code.size() == BIP32_EXTKEY_SIZE) {
              CExtPubKey xpub;
              xpub.Decode(code.data());
              const uint32_t key_exp_pos = fuzzed_data_provider.ConsumeIntegral<uint32_t>();
              CExtPubKey xpub_fetched;
              if (fuzzed_data_provider.ConsumeBool()) {
                  (void)descriptor_cache.GetCachedParentExtPubKey(key_exp_pos, xpub_fetched);
                  descriptor_cache.CacheParentExtPubKey(key_exp_pos, xpub);
                  assert(descriptor_cache.GetCachedParentExtPubKey(key_exp_pos, xpub_fetched));
              } else {
                  const uint32_t der_index = fuzzed_data_provider.ConsumeIntegral<uint32_t>();
                  (void)descriptor_cache.GetCachedDerivedExtPubKey(key_exp_pos, der_index, xpub_fetched);
                  descriptor_cache.CacheDerivedExtPubKey(key_exp_pos, der_index, xpub);
                  assert(descriptor_cache.GetCachedDerivedExtPubKey(key_exp_pos, der_index, xpub_fetched));
              }
              assert(xpub == xpub_fetched);
          }
          (void)descriptor_cache.GetCachedParentExtPubKeys();
          (void)descriptor_cache.GetCachedDerivedExtPubKeys();
      }
  }
  