text: // Copyright (c) 2020 The Finalcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <netaddress.h>
  #include <test/fuzz/fuzz.h>
  #include <util/asmap.h>
  
  #include <cstdint>
  #include <vector>
  
  //! asmap code that consumes nothing
  static const std::vector<bool> IPV6_PREFIX_ASMAP = {};
  
  //! asmap code that consumes the 96 prefix bits of ::ffff:0/96 (IPv4-in-IPv6 map)
  static const std::vector<bool> IPV4_PREFIX_ASMAP = {
      true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      true, true, false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true,         // Match 0xFF
      true, true, false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true          // Match 0xFF
  };
  
  FUZZ_TARGET(asmap)
  {
      // Encoding: [7 bits: asmap size] [1 bit: ipv6?] [3-130 bytes: asmap] [4 or 16 bytes: addr]
      if (buffer.size() < 1 + 3 + 4) return;
      int asmap_size = 3 + (buffer[0] & 127);
      bool ipv6 = buffer[0] & 128;
      const size_t addr_size = ipv6 ? ADDR_IPV6_SIZE : ADDR_IPV4_SIZE;
      if (buffer.size() < size_t(1 + asmap_size + addr_size)) return;
      std::vector<bool> asmap = ipv6 ? IPV6_PREFIX_ASMAP : IPV4_PREFIX_ASMAP;
      asmap.reserve(asmap.size() + 8 * asmap_size);
      for (int i = 0; i < asmap_size; ++i) {
          for (int j = 0; j < 8; ++j) {
              asmap.push_back((buffer[1 + i] >> j) & 1);
          }
      }
      if (!SanityCheckASMap(asmap, 128)) return;
  
      const uint8_t* addr_data = buffer.data() + 1 + asmap_size;
      CNetAddr net_addr;
      if (ipv6) {
          assert(addr_size == ADDR_IPV6_SIZE);
          net_addr.SetLegacyIPv6(Span<const uint8_t>(addr_data, addr_size));
      } else {
          assert(addr_size == ADDR_IPV4_SIZE);
          in_addr ipv4;
          memcpy(&ipv4, addr_data, addr_size);
          net_addr.SetIP(CNetAddr{ipv4});
      }
      (void)net_addr.GetMappedAS(asmap);
  }
  