/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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.
==================================================================== */
package org.apache.poi.hpsf;
import java.io.
IOException;
import java.io.
OutputStream;
import java.util.
Date;
import org.apache.poi.util.
LittleEndian;
import org.apache.poi.util.
LittleEndianByteArrayInputStream;
import org.apache.poi.util.
LittleEndianConsts;
public class
Filetime {
/**
* The difference between the Windows epoch (1601-01-01
* 00:00:00) and the Unix epoch (1970-01-01 00:00:00) in
* milliseconds.
*/
private static final long
EPOCH_DIFF = -11644473600000L;
private static final int
SIZE =
LittleEndian.
INT_SIZE * 2;
private static final long
UINT_MASK = 0x00000000FFFFFFFFL;
private static final long
NANO_100 = 1000L * 10L;
private int
_dwHighDateTime;
private int
_dwLowDateTime;
Filetime() {}
Filetime( int
low, int
high ) {
_dwLowDateTime =
low;
_dwHighDateTime =
high;
}
Filetime(
Date date ) {
long
filetime =
Filetime.
dateToFileTime(
date);
_dwHighDateTime = (int) ((
filetime >>> 32) &
UINT_MASK);
_dwLowDateTime = (int) (
filetime &
UINT_MASK);
}
void
read(
LittleEndianByteArrayInputStream lei ) {
_dwLowDateTime =
lei.
readInt();
_dwHighDateTime =
lei.
readInt();
}
long
getHigh() {
return
_dwHighDateTime;
}
long
getLow() {
return
_dwLowDateTime;
}
byte[]
toByteArray() {
byte[]
result = new byte[
SIZE];
LittleEndian.
putInt(
result, 0 *
LittleEndianConsts.
INT_SIZE,
_dwLowDateTime );
LittleEndian.
putInt(
result, 1 *
LittleEndianConsts.
INT_SIZE,
_dwHighDateTime );
return
result;
}
int
write(
OutputStream out ) throws
IOException {
LittleEndian.
putInt(
_dwLowDateTime,
out );
LittleEndian.
putInt(
_dwHighDateTime,
out );
return
SIZE;
}
Date getJavaValue() {
long
l = (((long)
_dwHighDateTime) << 32) | (
_dwLowDateTime &
UINT_MASK);
return
filetimeToDate(
l );
}
/**
* Converts a Windows FILETIME into a {@link Date}. The Windows
* FILETIME structure holds a date and time associated with a
* file. The structure identifies a 64-bit integer specifying the
* number of 100-nanosecond intervals which have passed since
* January 1, 1601.
*
* @param filetime The filetime to convert.
* @return The Windows FILETIME as a {@link Date}.
*/
public static
Date filetimeToDate(final long
filetime) {
final long
ms_since_16010101 =
filetime /
NANO_100;
final long
ms_since_19700101 =
ms_since_16010101 +
EPOCH_DIFF;
return new
Date(
ms_since_19700101);
}
/**
* Converts a {@link Date} into a filetime.
*
* @param date The date to be converted
* @return The filetime
*
* @see #filetimeToDate(long)
*/
public static long
dateToFileTime(final
Date date) {
long
ms_since_19700101 =
date.
getTime();
long
ms_since_16010101 =
ms_since_19700101 -
EPOCH_DIFF;
return
ms_since_16010101 *
NANO_100;
}
/**
* Return {@code true} if the date is undefined
*
* @param date the date
* @return {@code true} if the date is undefined
*/
public static boolean
isUndefined(
Date date) {
return (
date == null ||
dateToFileTime(
date) == 0);
}
}