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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.

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 long` | `dateToFileTime(java.util.Date date)` Converts a `Date` into a filetime.
`static boolean` | `equal(byte[] a, byte[] b)` Checks whether two byte arrays a and b are equal.
`static boolean` | `equals(java.util.Collection c1, java.util.Collection c2)` Checks whether two collections are equal.
`static boolean` | `equals(java.lang.Object[] c1, java.lang.Object[] c2)` Compares to object arrays with regarding the objects' order.
`static java.util.Date` | `filetimeToDate(int high, int low)` Converts a Windows FILETIME into a `Date`.
`static java.util.Date` | `filetimeToDate(long filetime)` Converts a Windows FILETIME into a `Date`.
`static byte[]` | `pad4(byte[] ba)` Pads a byte array with 0x00 bytes so that its length is a multiple of 4.
`static char[]` | `pad4(char[] ca)` Pads a character array with 0x0000 characters so that its length is a multiple of 4.
`static char[]` | `pad4(java.lang.String s)` Pads a string with 0x0000 characters so that its length is a multiple of 4.
`static java.lang.String` | `toString(java.lang.Throwable t)` Returns a textual representation of a `Throwable`, including a stacktrace.

Methods inherited from class java.lang.Object
`equals, 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`.

### filetimeToDate

    public static java.util.Date filetimeToDate(long filetime)

  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.

  Parameters:
    `filetime` - The filetime to convert.
  Returns:
    The Windows FILETIME as a `Date`.

### dateToFileTime

    public static long dateToFileTime(java.util.Date date)

  Converts a `Date` into a filetime.

  Parameters:
    `date` - The date to be converted
  Returns:
    The filetime
  See Also:
    `filetimeToDate(long)`, `filetimeToDate(int, int)`

### equals

    public static boolean equals(java.util.Collection c1,
                                 java.util.Collection c2)

  Checks whether two collections are equal. Two collections C1 and C2 are equal, if the following conditions are true:

  - For each c1i (element of C1) there is a c2j (element of C2), and c1i equals c2j.

  - For each c2i (element of C2) there is a c1j (element of C1) and c2i equals c1j.

  Parameters:
    `c1` - the first collection
    `c2` - the second collection
  Returns:
    `true` if the collections are equal, else `false`.

### equals

    public static boolean equals(java.lang.Object[] c1,
                                 java.lang.Object[] c2)

  Compares to object arrays with regarding the objects' order. For example, [1, 2, 3] and [2, 1, 3] are equal.

  Parameters:
    `c1` - The first object array.
    `c2` - The second object array.
  Returns:
    `true` if the object arrays are equal, `false` if they are not.

### pad4

    public static byte[] pad4(byte[] ba)

  Pads a byte array with 0x00 bytes so that its length is a multiple of 4.

  Parameters:
    `ba` - The byte array to pad.
  Returns:
    The padded byte array.

### pad4

    public static char[] pad4(char[] ca)

  Pads a character array with 0x0000 characters so that its length is a multiple of 4.

  Parameters:
    `ca` - The character array to pad.
  Returns:
    The padded character array.

### pad4

    public static char[] pad4(java.lang.String s)

  Pads a string with 0x0000 characters so that its length is a multiple of 4.

  Parameters:
    `s` - The string to pad.
  Returns:
    The padded string as a character array.

### toString

    public static java.lang.String toString(java.lang.Throwable t)

  Returns a textual representation of a `Throwable`, including a stacktrace.

  Parameters:
    `t` - The `Throwable`
  Returns:
    a string containing the output of a call to `t.printStacktrace()`.

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