/*

 *

 *    Copyright (c) 2013-2017 Nest Labs, Inc.

 *    All rights reserved.

 *

 *    Licensed under the Apache License, Version 2.0 (the "License");

 *    you may not use this file except in compliance with the License.

 *    You may obtain a copy of the License at

 *

 *        http://www.apache.org/licenses/LICENSE-2.0

 *

 *    Unless required by applicable law or agreed to in writing, software

 *    distributed under the License is distributed on an "AS IS" BASIS,

 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 *    See the License for the specific language governing permissions and

 *    limitations under the License.

 */

/**

 *    @file

 *      This file implements the concrete class

 *      <tt>nl::Inet::IPPrefix</tt>, which comprise two member fields:

 *      a) a IP address and b) a length field. The Nest Inet Layer

 *      uses objects of this class to represent Internet protocol

 *      address prefixes of both IPv4 and IPv6 address families.

 *

 */

#include <InetLayer/IPPrefix.h>

#include <Weave/Core/WeaveEncoding.h>

namespace nl {

namespace Inet {

IPPrefix IPPrefix::Zero;

bool IPPrefix::IsZero() const

{

    return  IPAddr.Addr[0] == 0 &&

            IPAddr.Addr[1] == 0 &&

            IPAddr.Addr[2] == 0 &&

            IPAddr.Addr[3] == 0 &&

            Length == 0;

}

bool IPPrefix::operator==(const IPPrefix& other) const

{

    return IPAddr == other.IPAddr && Length == other.Length;

}

bool IPPrefix::operator!=(const IPPrefix& other) const

{

    return IPAddr != other.IPAddr || Length != other.Length;

}

bool IPPrefix::MatchAddress(const IPAddress& addr) const

{

    uint8_t l = (Length <= 128) ? Length : 128;

    int i;

    for (i = 0; l >= 32; i++, l -= 32)

        if (IPAddr.Addr[i] != addr.Addr[i])

            return false;

    if (l == 0)

        return true;

    uint32_t mask = nl::Weave::Encoding::BigEndian::HostSwap32(0xFFFFFFFF << (32 - l));

    return (IPAddr.Addr[i] & mask) == (addr.Addr[i] & mask);

}

} // namespace Inet

} // namespace nl