/*******************************************************************************
 * COPYRIGHT(c) 2015 STMicroelectronics
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *   1. Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *   3. Neither the name of STMicroelectronics nor the names of its contributors
 *      may be used to endorse or promote products derived from this software
 *      without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************/

package com.st.BlueSTSDK.Utils;

/**
 * Class that help to unwrap the timestamp
 *
 * @author STMicroelectronics - Central Labs.
 * @version 1.0
 */
public class UnwrapTimestamp {

    private static final int NEAR_TO_END_TH =(1<<16)-100;

    /** number of time that the ts has reset, the timestamp is reset when we receive a ts with
     * a  value > 65435 and than a package with a smaller value */
    private int mNReset=0;
    /** last raw ts received from the board, it is a number between 0 and 2^16-1 */
    private int mLastTs=0;

    /**
     * If necessary it adds a multiple of (1&lt;&lt;16) for hide the timestamp reset
     * @param ts timestamp
     * @return unwrapped timestamp
     */
    synchronized public long unwrap(int ts){
        if(mLastTs>(NEAR_TO_END_TH) && mLastTs > ts)
            mNReset++;
        mLastTs=ts;
        return (long)mNReset * (1<<16) + (long)ts;
    }


}
