text: //
  // ip/impl/address_v6.ipp
  // ~~~~~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
  //
  // Distributed under the Boost Software License, Version 1.0. (See accompanying
  // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  //
  
  #ifndef BOOST_ASIO_IP_IMPL_ADDRESS_V6_IPP
  #define BOOST_ASIO_IP_IMPL_ADDRESS_V6_IPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include <boost/asio/detail/config.hpp>
  #include <cstring>
  #include <stdexcept>
  #include <typeinfo>
  #include <boost/asio/detail/socket_ops.hpp>
  #include <boost/asio/detail/throw_error.hpp>
  #include <boost/asio/detail/throw_exception.hpp>
  #include <boost/asio/error.hpp>
  #include <boost/asio/ip/address_v6.hpp>
  #include <boost/asio/ip/bad_address_cast.hpp>
  
  #include <boost/asio/detail/push_options.hpp>
  
  namespace boost {
  namespace asio {
  namespace ip {
  
  address_v6::address_v6() BOOST_ASIO_NOEXCEPT
    : addr_(),
      scope_id_(0)
  {
  }
  
  address_v6::address_v6(const address_v6::bytes_type& bytes,
      scope_id_type scope)
    : scope_id_(scope)
  {
  #if UCHAR_MAX > 0xFF
    for (std::size_t i = 0; i < bytes.size(); ++i)
    {
      if (bytes[i] > 0xFF)
      {
        std::out_of_range ex("address_v6 from bytes_type");
        boost::asio::detail::throw_exception(ex);
      }
    }
  #endif // UCHAR_MAX > 0xFF
  
    using namespace std; // For memcpy.
    memcpy(addr_.s6_addr, bytes.data(), 16);
  }
  
  address_v6::address_v6(const address_v6& other) BOOST_ASIO_NOEXCEPT
    : addr_(other.addr_),
      scope_id_(other.scope_id_)
  {
  }
  
  #if defined(BOOST_ASIO_HAS_MOVE)
  address_v6::address_v6(address_v6&& other) BOOST_ASIO_NOEXCEPT
    : addr_(other.addr_),
      scope_id_(other.scope_id_)
  {
  }
  #endif // defined(BOOST_ASIO_HAS_MOVE)
  
  address_v6& address_v6::operator=(const address_v6& other) BOOST_ASIO_NOEXCEPT
  {
    addr_ = other.addr_;
    scope_id_ = other.scope_id_;
    return *this;
  }
  
  #if defined(BOOST_ASIO_HAS_MOVE)
  address_v6& address_v6::operator=(address_v6&& other) BOOST_ASIO_NOEXCEPT
  {
    addr_ = other.addr_;
    scope_id_ = other.scope_id_;
    return *this;
  }
  #endif // defined(BOOST_ASIO_HAS_MOVE)
  
  address_v6::bytes_type address_v6::to_bytes() const BOOST_ASIO_NOEXCEPT
  {
    using namespace std; // For memcpy.
    bytes_type bytes;
  #if defined(BOOST_ASIO_HAS_STD_ARRAY)
    memcpy(bytes.data(), addr_.s6_addr, 16);
  #else // defined(BOOST_ASIO_HAS_STD_ARRAY)
    memcpy(bytes.elems, addr_.s6_addr, 16);
  #endif // defined(BOOST_ASIO_HAS_STD_ARRAY)
    return bytes;
  }
  
  std::string address_v6::to_string() const
  {
    boost::system::error_code ec;
    char addr_str[boost::asio::detail::max_addr_v6_str_len];
    const char* addr =
      boost::asio::detail::socket_ops::inet_ntop(
          BOOST_ASIO_OS_DEF(AF_INET6), &addr_, addr_str,
          boost::asio::detail::max_addr_v6_str_len, scope_id_, ec);
    if (addr == 0)
      boost::asio::detail::throw_error(ec);
    return addr;
  }
  
  #if !defined(BOOST_ASIO_NO_DEPRECATED)
  std::string address_v6::to_string(boost::system::error_code& ec) const
  {
    char addr_str[boost::asio::detail::max_addr_v6_str_len];
    const char* addr =
      boost::asio::detail::socket_ops::inet_ntop(
          BOOST_ASIO_OS_DEF(AF_INET6), &addr_, addr_str,
          boost::asio::detail::max_addr_v6_str_len, scope_id_, ec);
    if (addr == 0)
      return std::string();
    return addr;
  }
  
  address_v4 address_v6::to_v4() const
  {
    if (!is_v4_mapped() && !is_v4_compatible())
    {
      bad_address_cast ex;
      boost::asio::detail::throw_exception(ex);
    }
  
    address_v4::bytes_type v4_bytes = { { addr_.s6_addr[12],
      addr_.s6_addr[13], addr_.s6_addr[14], addr_.s6_addr[15] } };
    return address_v4(v4_bytes);
  }
  #endif // !defined(BOOST_ASIO_NO_DEPRECATED)
  
  bool address_v6::is_loopback() const BOOST_ASIO_NOEXCEPT
  {
    return ((addr_.s6_addr[0] == 0) && (addr_.s6_addr[1] == 0)
        && (addr_.s6_addr[2] == 0) && (addr_.s6_addr[3] == 0)
        && (addr_.s6_addr[4] == 0) && (addr_.s6_addr[5] == 0)
        && (addr_.s6_addr[6] == 0) && (addr_.s6_addr[7] == 0)
        && (addr_.s6_addr[8] == 0) && (addr_.s6_addr[9] == 0)
        && (addr_.s6_addr[10] == 0) && (addr_.s6_addr[11] == 0)
        && (addr_.s6_addr[12] == 0) && (addr_.s6_addr[13] == 0)
        && (addr_.s6_addr[14] == 0) && (addr_.s6_addr[15] == 1));
  }
  
  bool address_v6::is_unspecified() const BOOST_ASIO_NOEXCEPT
  {
    return ((addr_.s6_addr[0] == 0) && (addr_.s6_addr[1] == 0)
        && (addr_.s6_addr[2] == 0) && (addr_.s6_addr[3] == 0)
        && (addr_.s6_addr[4] == 0) && (addr_.s6_addr[5] == 0)
        && (addr_.s6_addr[6] == 0) && (addr_.s6_addr[7] == 0)
        && (addr_.s6_addr[8] == 0) && (addr_.s6_addr[9] == 0)
        && (addr_.s6_addr[10] == 0) && (addr_.s6_addr[11] == 0)
        && (addr_.s6_addr[12] == 0) && (addr_.s6_addr[13] == 0)
        && (addr_.s6_addr[14] == 0) && (addr_.s6_addr[15] == 0));
  }
  
  bool address_v6::is_link_local() const BOOST_ASIO_NOEXCEPT
  {
    return ((addr_.s6_addr[0] == 0xfe) && ((addr_.s6_addr[1] & 0xc0) == 0x80));
  }
  
  bool address_v6::is_site_local() const BOOST_ASIO_NOEXCEPT
  {
    return ((addr_.s6_addr[0] == 0xfe) && ((addr_.s6_addr[1] & 0xc0) == 0xc0));
  }
  
  bool address_v6::is_v4_mapped() const BOOST_ASIO_NOEXCEPT
  {
    return ((addr_.s6_addr[0] == 0) && (addr_.s6_addr[1] == 0)
        && (addr_.s6_addr[2] == 0) && (addr_.s6_addr[3] == 0)
        && (addr_.s6_addr[4] == 0) && (addr_.s6_addr[5] == 0)
        && (addr_.s6_addr[6] == 0) && (addr_.s6_addr[7] == 0)
        && (addr_.s6_addr[8] == 0) && (addr_.s6_addr[9] == 0)
        && (addr_.s6_addr[10] == 0xff) && (addr_.s6_addr[11] == 0xff));
  }
  
  #if !defined(BOOST_ASIO_NO_DEPRECATED)
  bool address_v6::is_v4_compatible() const
  {
    return ((addr_.s6_addr[0] == 0) && (addr_.s6_addr[1] == 0)
        && (addr_.s6_addr[2] == 0) && (addr_.s6_addr[3] == 0)
        && (addr_.s6_addr[4] == 0) && (addr_.s6_addr[5] == 0)
        && (addr_.s6_addr[6] == 0) && (addr_.s6_addr[7] == 0)
        && (addr_.s6_addr[8] == 0) && (addr_.s6_addr[9] == 0)
        && (addr_.s6_addr[10] == 0) && (addr_.s6_addr[11] == 0)
        && !((addr_.s6_addr[12] == 0)
          && (addr_.s6_addr[13] == 0)
          && (addr_.s6_addr[14] == 0)
          && ((addr_.s6_addr[15] == 0) || (addr_.s6_addr[15] == 1))));
  }
  #endif // !defined(BOOST_ASIO_NO_DEPRECATED)
  
  bool address_v6::is_multicast() const BOOST_ASIO_NOEXCEPT
  {
    return (addr_.s6_addr[0] == 0xff);
  }
  
  bool address_v6::is_multicast_global() const BOOST_ASIO_NOEXCEPT
  {
    return ((addr_.s6_addr[0] == 0xff) && ((addr_.s6_addr[1] & 0x0f) == 0x0e));
  }
  
  bool address_v6::is_multicast_link_local() const BOOST_ASIO_NOEXCEPT
  {
    return ((addr_.s6_addr[0] == 0xff) && ((addr_.s6_addr[1] & 0x0f) == 0x02));
  }
  
  bool address_v6::is_multicast_node_local() const BOOST_ASIO_NOEXCEPT
  {
    return ((addr_.s6_addr[0] == 0xff) && ((addr_.s6_addr[1] & 0x0f) == 0x01));
  }
  
  bool address_v6::is_multicast_org_local() const BOOST_ASIO_NOEXCEPT
  {
    return ((addr_.s6_addr[0] == 0xff) && ((addr_.s6_addr[1] & 0x0f) == 0x08));
  }
  
  bool address_v6::is_multicast_site_local() const BOOST_ASIO_NOEXCEPT
  {
    return ((addr_.s6_addr[0] == 0xff) && ((addr_.s6_addr[1] & 0x0f) == 0x05));
  }
  
  bool operator==(const address_v6& a1, const address_v6& a2) BOOST_ASIO_NOEXCEPT
  {
    using namespace std; // For memcmp.
    return memcmp(&a1.addr_, &a2.addr_,
        sizeof(boost::asio::detail::in6_addr_type)) == 0
      && a1.scope_id_ == a2.scope_id_;
  }
  
  bool operator<(const address_v6& a1, const address_v6& a2) BOOST_ASIO_NOEXCEPT
  {
    using namespace std; // For memcmp.
    int memcmp_result = memcmp(&a1.addr_, &a2.addr_,
        sizeof(boost::asio::detail::in6_addr_type));
    if (memcmp_result < 0)
      return true;
    if (memcmp_result > 0)
      return false;
    return a1.scope_id_ < a2.scope_id_;
  }
  
  address_v6 address_v6::loopback() BOOST_ASIO_NOEXCEPT
  {
    address_v6 tmp;
    tmp.addr_.s6_addr[15] = 1;
    return tmp;
  }
  
  #if !defined(BOOST_ASIO_NO_DEPRECATED)
  address_v6 address_v6::v4_mapped(const address_v4& addr)
  {
    address_v4::bytes_type v4_bytes = addr.to_bytes();
    bytes_type v6_bytes = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF,
      v4_bytes[0], v4_bytes[1], v4_bytes[2], v4_bytes[3] } };
    return address_v6(v6_bytes);
  }
  
  address_v6 address_v6::v4_compatible(const address_v4& addr)
  {
    address_v4::bytes_type v4_bytes = addr.to_bytes();
    bytes_type v6_bytes = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      v4_bytes[0], v4_bytes[1], v4_bytes[2], v4_bytes[3] } };
    return address_v6(v6_bytes);
  }
  #endif // !defined(BOOST_ASIO_NO_DEPRECATED)
  
  address_v6 make_address_v6(const char* str)
  {
    boost::system::error_code ec;
    address_v6 addr = make_address_v6(str, ec);
    boost::asio::detail::throw_error(ec);
    return addr;
  }
  
  address_v6 make_address_v6(const char* str,
      boost::system::error_code& ec) BOOST_ASIO_NOEXCEPT
  {
    address_v6::bytes_type bytes;
    unsigned long scope_id = 0;
    if (boost::asio::detail::socket_ops::inet_pton(
          BOOST_ASIO_OS_DEF(AF_INET6), str, &bytes[0], &scope_id, ec) <= 0)
      return address_v6();
    return address_v6(bytes, scope_id);
  }
  
  address_v6 make_address_v6(const std::string& str)
  {
    return make_address_v6(str.c_str());
  }
  
  address_v6 make_address_v6(const std::string& str,
      boost::system::error_code& ec) BOOST_ASIO_NOEXCEPT
  {
    return make_address_v6(str.c_str(), ec);
  }
  
  #if defined(BOOST_ASIO_HAS_STRING_VIEW)
  
  address_v6 make_address_v6(string_view str)
  {
    return make_address_v6(static_cast<std::string>(str));
  }
  
  address_v6 make_address_v6(string_view str,
      boost::system::error_code& ec) BOOST_ASIO_NOEXCEPT
  {
    return make_address_v6(static_cast<std::string>(str), ec);
  }
  
  #endif // defined(BOOST_ASIO_HAS_STRING_VIEW)
  
  address_v4 make_address_v4(
      v4_mapped_t, const address_v6& v6_addr)
  {
    if (!v6_addr.is_v4_mapped())
    {
      bad_address_cast ex;
      boost::asio::detail::throw_exception(ex);
    }
  
    address_v6::bytes_type v6_bytes = v6_addr.to_bytes();
    address_v4::bytes_type v4_bytes = { { v6_bytes[12],
      v6_bytes[13], v6_bytes[14], v6_bytes[15] } };
    return address_v4(v4_bytes);
  }
  
  address_v6 make_address_v6(
      v4_mapped_t, const address_v4& v4_addr)
  {
    address_v4::bytes_type v4_bytes = v4_addr.to_bytes();
    address_v6::bytes_type v6_bytes = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0xFF, 0xFF, v4_bytes[0], v4_bytes[1], v4_bytes[2], v4_bytes[3] } };
    return address_v6(v6_bytes);
  }
  
  } // namespace ip
  } // namespace asio
  } // namespace boost
  
  #include <boost/asio/detail/pop_options.hpp>
  
  #endif // BOOST_ASIO_IP_IMPL_ADDRESS_V6_IPP
  