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// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
package com.intellij.util.io.zip;

import java.util.Calendar;

public final class DosTime {
  private DosTime() {
  }

  /*
   * Converts DOS time to Java time (number of milliseconds since epoch).
   */
  public static long dosToJavaTime(long dtime) {
    Calendar cal = Calendar.getInstance();
    cal.set((int)(((dtime >> 25) & 0x7f) + 1980), (int)(((dtime >> 21) & 0x0f) - 1), (int)((dtime >> 16) & 0x1f),
            (int)((dtime >> 11) & 0x1f), (int)((dtime >> 5) & 0x3f), (int)((dtime << 1) & 0x3e));
    cal.clear(Calendar.MILLISECOND);
    return cal.getTimeInMillis();
  }

  /*
   * Converts Java time to DOS time.
   */
  public static long javaToDosTime(long time) {
    Calendar cal = Calendar.getInstance();
    cal.setTimeInMillis(time);
    int year = cal.get(Calendar.YEAR);
    if (year < 1980) {
      return (1 << 21) | (1 << 16);
    }
    return (year - 1980L) << 25
           | (cal.get(Calendar.MONTH) + 1) << 21
           | cal.get(Calendar.DAY_OF_MONTH) << 16
           | cal.get(Calendar.HOUR_OF_DAY) << 11
           | cal.get(Calendar.MINUTE) << 5
           | cal.get(Calendar.SECOND) >> 1;
  }
}