org.ka2ddo.util

Class Ascii85

java.lang.Object

org.ka2ddo.util.Ascii85

public class Ascii85
extends java.lang.Object

This class provides means to encode and decode byte arrays into ASCII85 (base-85) strings.

An ASCII85 string encodes a sequence of bytes by taking the byte data 4 bytes at a time and factoring it into modulo-85 chunks, and then converting the modulos into printable US-ASCII characters, where modulo=0 -> '!', modulo=1 -> '"', etc., up to modulo=84 -> 'u' through the US-ASCII character set. 'z' is reserved to handle the special case of a 4-byte block that is all zero.

For more information, see https://en.wikipedia.org/wiki/Ascii85 for a description of the encoding algorithm.

Author:

Andrew Pavlin, KA2DDO

Method Summary

Modifier and Type	Method and Description
static byte[]	decode(java.lang.String enc) Decode a String in ASCII-85 encoding into a byte array
static java.lang.String	encode(byte[] sequence) Encode a byte array into an ASCII-85-encoded string.

Methods inherited from class java.lang.Object

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

Method Detail

encode

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

Encode a byte array into an ASCII-85-encoded string.

Parameters:

sequence - byte array to encode

Returns:

encoded String

decode

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

Decode a String in ASCII-85 encoding into a byte array

Parameters:

enc - encoded String

Returns:

byte array decoded from the String