org.opennms.core.utils
Class Base64

java.lang.Object
  org.opennms.core.utils.Base64

public final class Base64

extends java.lang.Object

Performs base 64 encoding and decoding on byte arrays.

Version:

CVS 1.1.1.1

Author:

Brian Weaver, OpenNMS

Field Summary

private static char[]	BASE64_CHARS The base64 encoding map.
private static char	BASE64_PAD The base64 padding character
private static byte[]	BASE64_VALUES

Constructor Summary

private

Base64() Empty, private constructor so this object will not be instantiated.

Method Summary

static byte[]	decodeBase64(char[] data) Decodes a character array into the corresponding byte array.
static char[]	encodeBase64(byte[] data) Encodes the passed byte array using the base64 rules.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

BASE64_CHARS

private static final char[] BASE64_CHARS

The base64 encoding map. Using 6-bit values it is possible to map 24-bits into 4 characters. If there are not sufficent amount of bits to makeup six then it is padded with BASE64_PAD.

BASE64_VALUES

private static final byte[] BASE64_VALUES

BASE64_PAD

private static final char BASE64_PAD

The base64 padding character

See Also:

Constant Field Values

Constructor Detail

Base64

private Base64()

Empty, private constructor so this object will not be instantiated.

Method Detail

encodeBase64

public static char[] encodeBase64(byte[] data)

Encodes the passed byte array using the base64 rules. The base64 encoding schema is performed by grouping the bytes in to 6-bit quantities and then encoding them.

For more information see RFC1341 for the format used for base64 encoding.

Parameters:

data - The input byte array

Returns:

The converted data in a character stream.

decodeBase64

public static byte[] decodeBase64(char[] data)

Decodes a character array into the corresponding byte array. The buffer must be an intergral number of 4 character. I.E. size mod 4 is equal to zero or an exception will be thrown. Likewise, if there is an invalid character in the input array then an exception will be thrown.

Parameters:

data - The data stream to be filtered.

Returns:

The coverted array of bytes.

Throws:

java.lang.IllegalArgumentException - Thrown if an invalid buffer that cannot be decoded is passed.