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## org.apache.poi.hpsf
Class Util

    java.lang.Object
      org.apache.poi.hpsf.Util

public class Util
extends java.lang.Object

Provides various static utility methods.

Since:
  2002-02-09
Version:
  $Id: Util.java,v 1.7.4.1 2004/02/22 11:54:45 glens Exp $
Author:
  Rainer Klute (klute@rainer-klute.de)

Field Summary
`static long` | `EPOCH_DIFF` The difference between the Windows epoch (1601-01-01 00:00:00) and the Unix epoch (1970-01-01 00:00:00) in milliseconds: 11644473600000L.

Constructor Summary
`Util()`

Method Summary
`static byte[]` | `cat(byte[][] byteArrays)` Concatenates the contents of several byte arrays into a single one.
`static byte[]` | `copy(byte[] src, int offset, int length)` Copies bytes from a source byte array into a new byte array.
`static void` | `copy(byte[] src, int srcOffset, int length, byte[] dst, int dstOffset)` Copies a part of a byte array into another byte array.
`static boolean` | `equal(byte[] a, byte[] b)` Checks whether two byte arrays a and b are equal.
`static java.util.Date` | `filetimeToDate(int high, int low)` Converts a Windows FILETIME into a `Date`.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### EPOCH_DIFF

    public static final long EPOCH_DIFF

  The difference between the Windows epoch (1601-01-01 00:00:00) and the Unix epoch (1970-01-01 00:00:00) in milliseconds: 11644473600000L. (Use your favorite spreadsheet program to verify the correctness of this value. By the way, did you notice that you can tell from the epochs which operating system is the modern one? :-))

  See Also:
    Constant Field Values

Constructor Detail

### Util

    public Util()

Method Detail

### equal

    public static boolean equal(byte[] a,
                                byte[] b)

  Checks whether two byte arrays a and b are equal. They are equal

  - if they have the same length and

  - if for each i with i >= 0 and i < a.length holds a[i] == b[i].

  Parameters:
    `a` - The first byte array
    `b` - The first byte array
  Returns:
    `true` if the byte arrays are equal, else `false`

### copy

    public static void copy(byte[] src,
                            int srcOffset,
                            int length,
                            byte[] dst,
                            int dstOffset)

  Copies a part of a byte array into another byte array.

  Parameters:
    `src` - The source byte array.
    `srcOffset` - Offset in the source byte array.
    `length` - The number of bytes to copy.
    `dst` - The destination byte array.
    `dstOffset` - Offset in the destination byte array.

### cat

    public static byte[] cat(byte[][] byteArrays)

  Concatenates the contents of several byte arrays into a single one.

  Parameters:
    `byteArrays` - The byte arrays to be concatened.
  Returns:
    A new byte array containing the concatenated byte arrays.

### copy

    public static byte[] copy(byte[] src,
                              int offset,
                              int length)

  Copies bytes from a source byte array into a new byte array.

  Parameters:
    `src` - Copy from this byte array.
    `offset` - Start copying here.
    `length` - Copy this many bytes.
  Returns:
    The new byte array. Its length is number of copied bytes.

### filetimeToDate

    public static java.util.Date filetimeToDate(int high,
                                                int low)

  Converts a Windows FILETIME into a `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. This 64-bit value is split into the two double words stored in the structure.

  Parameters:
    `high` - The higher double word of the FILETIME structure.
    `low` - The lower double word of the FILETIME structure.
  Returns:
    The Windows FILETIME as a `Date`.

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Copyright © 2003 Apache Software Foundation.