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API for interpreting runs of binary as values humans can understand
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/*
* Hex - a hex viewer and annotator
* Copyright (C) 2009-2014,2016-2017 Trejkaz, Hex Project
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see .
*/
package org.trypticon.hex.interpreters.dates;
import org.trypticon.hex.binary.Binary;
import org.trypticon.hex.interpreters.AbstractFixedLengthInterpreter;
import org.trypticon.hex.interpreters.primitives.BigEndian;
import javax.annotation.Nonnull;
/**
* Interpreter for NeXTSTEP/Mac OS X {@code NSDate} / {@code CFDateRef} values.
*
* @author trejkaz
*/
public class MacNSDateInterpreter extends AbstractFixedLengthInterpreter {
// Computed using Calendar for January 1, 2001 00:00 UTC and then just taking the value.
private static final long EPOCH = 978307200000L;
public MacNSDateInterpreter() {
super(DateTime.class, 8);
}
@Nonnull
@Override
protected DateTime interpret(@Nonnull Binary binary, long position) {
// Value is the number of seconds since January 1, 2001 (UTC)
double value = Double.longBitsToDouble(BigEndian.getLong(binary, position));
long wholeSeconds = (long) Math.floor(value);
long nanosInSecond = (long) (Math.abs(value - wholeSeconds) * DateConversion.NANOS_IN_SECOND);
long millis = wholeSeconds * DateConversion.MILLIS_IN_SECOND +
nanosInSecond / DateConversion.NANOS_IN_MILLISECOND;
int remainingNanos = (int) (nanosInSecond % DateConversion.NANOS_IN_MILLISECOND);
return new EpochDateTime(8, EPOCH, millis, remainingNanos);
}
}