# File ipaddr.rb, line 402
  def initialize(addr = '::', family = Socket::AF_UNSPEC)
    if !addr.kind_of?(String)
      if family != Socket::AF_INET6 && family != Socket::AF_INET
        raise ArgumentError, "unsupported address family"
      end
      set(addr, family)
      @mask_addr = (family == Socket::AF_INET) ? IN4MASK : IN6MASK
      return
    end
    prefix, prefixlen = addr.split('/')
    if prefix =~ /^\[(.*)\]$/i
      prefix = $1
      family = Socket::AF_INET6
    end
    # It seems AI_NUMERICHOST doesn't do the job.
    #Socket.getaddrinfo(left, nil, Socket::AF_INET6, Socket::SOCK_STREAM, nil,
    #                  Socket::AI_NUMERICHOST)
    begin
      IPSocket.getaddress(prefix)               # test if address is vaild
    rescue
      raise ArgumentError, "invalid address"
    end
    @addr = @family = nil
    if family == Socket::AF_UNSPEC || family == Socket::AF_INET
      @addr = in_addr(prefix)
      if @addr
        @family = Socket::AF_INET
      end
    end
    if !@addr && (family == Socket::AF_UNSPEC || family == Socket::AF_INET6)
      @addr = in6_addr(prefix)
      @family = Socket::AF_INET6
    end
    if family != Socket::AF_UNSPEC && @family != family
      raise ArgumentError, "address family unmatch"
    end
    if prefixlen
      mask!(prefixlen)
    else
      @mask_addr = (family == Socket::AF_INET) ? IN4MASK : IN6MASK
    end
  end

# File ipaddr.rb, line 90
  def IPAddr::new_ntoh(addr)
    return IPAddr.new(IPAddr::ntop(addr))
  end

# File ipaddr.rb, line 96
  def IPAddr::ntop(addr)
    case addr.size
    when 4
      s = addr.unpack('C4').join('.')
    when 16
      s = IN6FORMAT % addr.unpack('n8')
    else
      raise ArgumentError, "unsupported address family"
    end
    return s
  end

# File ipaddr.rb, line 109
  def &(other)
    return self.clone.set(@addr & other.to_i)
  end

# File ipaddr.rb, line 124
  def <<(num)
    return self.clone.set(addr_mask(@addr << num))
  end

# File ipaddr.rb, line 134
  def ==(other)
    if other.kind_of?(IPAddr) && @family != other.family
      return false
    end
    return (@addr == other.to_i)
  end

# File ipaddr.rb, line 119
  def >>(num)
    return self.clone.set(@addr >> num)
  end

# File ipaddr.rb, line 225
  def hton
    case @family
    when Socket::AF_INET
      return [@addr].pack('N')
    when Socket::AF_INET6
      return (0..7).map { |i|
        (@addr >> (112 - 16 * i)) & 0xffff
      }.pack('n8')
    else
      raise "unsupported address family"
    end
  end

# File ipaddr.rb, line 155
  def include?(other)
    if ipv4_mapped?
      if (@mask_addr >> 32) != 0xffffffffffffffffffffffff
        return false
      end
      mask_addr = (@mask_addr & IN4MASK)
      addr = (@addr & IN4MASK)
      family = Socket::AF_INET
    else
      mask_addr = @mask_addr
      addr = @addr
      family = @family
    end
    if other.kind_of?(IPAddr)
      if other.ipv4_mapped?
        other_addr = (other.to_i & IN4MASK)
        other_family = Socket::AF_INET
      else
        other_addr = other.to_i
        other_family = other.family
      end
    else # Not IPAddr - assume integer in same family as us
      other_addr   = other.to_i
      other_family = family
    end

    if family != other_family
      return false
    end
    return ((addr & mask_addr) == (other_addr & mask_addr))
  end

# File ipaddr.rb, line 321
  def inspect
    case @family
    when Socket::AF_INET
      af = "IPv4"
    when Socket::AF_INET6
      af = "IPv6"
    else
      raise "unsupported address family"
    end
    return sprintf("#<%s: %s:%s/%s>", self.class.name,
                   af, _to_string(@addr), _to_string(@mask_addr))
  end

# File ipaddr.rb, line 304
  def ip6_arpa
    if !ipv6?
      raise ArgumentError, "not an IPv6 address"
    end
    return _reverse + ".ip6.arpa"
  end

# File ipaddr.rb, line 312
  def ip6_int
    if !ipv6?
      raise ArgumentError, "not an IPv6 address"
    end
    return _reverse + ".ip6.int"
  end

# File ipaddr.rb, line 239
  def ipv4?
    return @family == Socket::AF_INET
  end

# File ipaddr.rb, line 273
  def ipv4_compat
    if !ipv4?
      raise ArgumentError, "not an IPv4 address"
    end
    return self.clone.set(@addr, Socket::AF_INET6)
  end

# File ipaddr.rb, line 254
  def ipv4_compat?
    if !ipv6? || (@addr >> 32) != 0
      return false
    end
    a = (@addr & IN4MASK)
    return a != 0 && a != 1
  end

# File ipaddr.rb, line 264
  def ipv4_mapped
    if !ipv4?
      raise ArgumentError, "not an IPv4 address"
    end
    return self.clone.set(@addr | 0xffff00000000, Socket::AF_INET6)
  end

# File ipaddr.rb, line 249
  def ipv4_mapped?
    return ipv6? && (@addr >> 32) == 0xffff
  end

# File ipaddr.rb, line 244
  def ipv6?
    return @family == Socket::AF_INET6
  end

# File ipaddr.rb, line 143
  def mask(prefixlen)
    return self.clone.mask!(prefixlen)
  end

# File ipaddr.rb, line 283
  def native
    if !ipv4_mapped? && !ipv4_compat?
      return self
    end
    return self.clone.set(@addr & IN4MASK, Socket::AF_INET)
  end

# File ipaddr.rb, line 292
  def reverse
    case @family
    when Socket::AF_INET
      return _reverse + ".in-addr.arpa"
    when Socket::AF_INET6
      return ip6_arpa
    else
      raise "unsupported address family"
    end
  end

# File ipaddr.rb, line 189
  def to_i
    return @addr
  end

# File ipaddr.rb, line 194
  def to_s
    str = to_string
    return str if ipv4?

    str.gsub!(/\b0{1,3}([\da-f]+)\b/i, '\1')
    loop do
      break if str.sub!(/\A0:0:0:0:0:0:0:0\Z/, '::')
      break if str.sub!(/\b0:0:0:0:0:0:0\b/, ':')
      break if str.sub!(/\b0:0:0:0:0:0\b/, ':')
      break if str.sub!(/\b0:0:0:0:0\b/, ':')
      break if str.sub!(/\b0:0:0:0\b/, ':')
      break if str.sub!(/\b0:0:0\b/, ':')
      break if str.sub!(/\b0:0\b/, ':')
      break
    end
    str.sub!(/:{3,}/, '::')

    if /\A::(ffff:)?([\da-f]{1,4}):([\da-f]{1,4})\Z/i =~ str
      str = sprintf('::%s%d.%d.%d.%d', $1, $2.hex / 256, $2.hex % 256, $3.hex / 256, $3.hex % 256)
    end

    str
  end

# File ipaddr.rb, line 220
  def to_string
    return _to_string(@addr)
  end

# File ipaddr.rb, line 114
  def |(other)
    return self.clone.set(@addr | other.to_i)
  end

# File ipaddr.rb, line 129
  def ~
    return self.clone.set(addr_mask(~@addr))
  end

# File ipaddr.rb, line 356
  def mask!(mask)
    if mask.kind_of?(String)
      if mask =~ /^\d+$/
        prefixlen = mask.to_i
      else
        m = IPAddr.new(mask)
        if m.family != @family
          raise ArgumentError, "address family is not same"
        end
        @mask_addr = m.to_i
        @addr &= @mask_addr
        return self
      end
    else
      prefixlen = mask
    end
    case @family
    when Socket::AF_INET
      if prefixlen < 0 || prefixlen > 32
        raise ArgumentError, "invalid length"
      end
      masklen = 32 - prefixlen
      @mask_addr = ((IN4MASK >> masklen) << masklen)
    when Socket::AF_INET6
      if prefixlen < 0 || prefixlen > 128
        raise ArgumentError, "invalid length"
      end
      masklen = 128 - prefixlen
      @mask_addr = ((IN6MASK >> masklen) << masklen)
    else
      raise "unsupported address family"
    end
    @addr = ((@addr >> masklen) << masklen)
    return self
  end

# File ipaddr.rb, line 336
  def set(addr, *family)
    case family[0] ? family[0] : @family
    when Socket::AF_INET
      if addr < 0 || addr > IN4MASK
        raise ArgumentError, "invalid address"
      end
    when Socket::AF_INET6
      if addr < 0 || addr > IN6MASK
        raise ArgumentError, "invalid address"
      end
    else
      raise ArgumentError, "unsupported address family"
    end
    @addr = addr
    if family[0]
      @family = family[0]
    end
    return self
  end