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com.cybertivity.powerjournal
Class Base64  

java.lang.Object
  com.cybertivity.powerjournal.Base64

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public class Base64

extends java.lang.Object

Encode arbitrary binary into printable ASCII using BASE64 encoding. very loosely based on the Base64 Reader by Dr. Mark Thornton Optrak Distribution Software Ltd. http://www.optrak.co.uk and Kevin Kelley's http://www.ruralnet.net/~kelley/java/Base64.java Base64 is a way of encoding 8-bit characters using only ASCII printable characters. The spec is described in RFC 2045. Base64 is a scheme where 3 bytes are concatenated, then split to form 4 groups of 6-bits each; and each 6-bits gets translated to an encoded printable ASCII character, via a table lookup. An encoded string is therefore longer than the original by about 1/3. The "=" character is used to pad the end. Base64 is used, among other things, to encode the user:password string in an Authorization: header for HTTP. Don't confuse Base64 with x-www-form-urlencoded which is handled by Java.net.URLEncoder.encode/decode If you wanted to encode a giant file, you could do it in large chunks that are even multiples of 3 bytes, except for the last chunk, and append the outputs. version 1.1 1999 December 04 -- more symmetrical encoding algorithm. more accurate StringBuffer allocation size. version 1.0 1999 December 03 -- posted in comp.lang.java.programmer.

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Field Summary
(package private) static int[]	charToValue           binary value encoded by a given letter of the alphabet 0..63
private static boolean	debug           used to disable test driver
(package private) static int	IGNORE           Marker value for chars we just ignore, e.g.
private static int	lineLength           max chars per line.
(package private) static java.lang.String	lineSeparator           how we separate lines, e.g.
(package private) static int	PAD           Marker for = trailing pad
(package private) static char[]	valueToChar           letter of the alphabet used to encode binary values 0..63

 

Constructor Summary

Base64()

 

Method Summary
static byte[]	decode(java.lang.String s)           decode a well-formed complete Base64 string back into an array of bytes.
static java.lang.String	encode(byte[] b)           Encode an arbitrary array of bytes as Base64 printable ASCII.
static void	main(java.lang.String[] args)           test driver
static void	setLineLength(int length)           determines how long the lines are that are generated by encode.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

lineSeparator

static java.lang.String lineSeparator

how we separate lines, e.g. \n, \r\n, \r etc.

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lineLength

private static int lineLength

max chars per line. A multiple of 4.

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valueToChar

static final char[] valueToChar

letter of the alphabet used to encode binary values 0..63

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charToValue

static final int[] charToValue

binary value encoded by a given letter of the alphabet 0..63

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IGNORE

static final int IGNORE

Marker value for chars we just ignore, e.g. \n \r high ascii

See Also:

Constant Field Values

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PAD

static final int PAD

Marker for = trailing pad

See Also:

Constant Field Values

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debug

private static final boolean debug

used to disable test driver

See Also:

Constant Field Values

Constructor Detail

Base64

public Base64()

Method Detail

encode

public static java.lang.String encode(byte[] b)

Encode an arbitrary array of bytes as Base64 printable ASCII. It will be broken into lines of 72 chars each. The last line is not terminated with a line separator.

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decode

public static byte[] decode(java.lang.String s)

decode a well-formed complete Base64 string back into an array of bytes.

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setLineLength

public static void setLineLength(int length)

determines how long the lines are that are generated by encode. Ignored by decode.

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main

public static void main(java.lang.String[] args)

test driver

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