com.vgrs.xcode.common
Class Base32

java.lang.Object
  com.vgrs.xcode.common.Base32

public final class Base32
extends java.lang.Object

Implements a Base 32 algorithm with encode and decode operations. The encode operation converts data on the range [0x00 - 0xff] to data on the range [a-z, 2-7]. The following table describes the conversion:

input		base-32
bits	hex	hex	char
00000	0x00	0x61	a
00001	0x01	0x62	b
00010	0x02	0x63	c
00011	0x03	0x64	d
00100	0x04	0x65	e
00101	0x05	0x66	f
00110	0x06	0x67	g
00111	0x07	0x68	h
01000	0x08	0x69	i
01001	0x09	0x6A	j
01010	0x0A	0x6B	k
01011	0x0B	0x6C	l
01100	0x0C	0x6D	m
01101	0x0D	0x6E	n
01110	0x0E	0x6F	o
01111	0x0F	0x70	p
10000	0x10	0x71	q
10001	0x11	0x72	r
10010	0x12	0x73	s
10011	0x13	0x74	t
10100	0x14	0x75	u
10101	0x15	0x76	v
10110	0x16	0x77	w
10111	0x17	0x78	x
11000	0x18	0x79	y
11001	0x19	0x7A	z
11010	0x1A	0x32	2
11011	0x1B	0x33	3
11100	0x1C	0x34	4
11101	0x1D	0x35	5
11110	0x1E	0x36	6
11111	0x1F	0x37	7

data of size 1 bytes will be converted to 2 base-32 characters.
data of size 2 bytes will be converted to 4 base-32 characters.
data of size 3 bytes will be converted to 5 base-32 characters.
data of size 4 bytes will be converted to 7 base-32 characters.
data of size 5 bytes will be converted to 8 base-32 characters.

Field Summary

static byte

ZERO Value of Ox0000

Constructor Summary

Base32()

Method Summary

static byte[]	decode(char[] aInput) Decode a base 32 sequence into an array of bytes
static char[]	encode(byte[] aInput) Encode a byte array into a base 32 sequence

Methods inherited from class java.lang.Object

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

Field Detail

ZERO

public static final byte ZERO

Value of Ox0000

See Also:

Constant Field Values

Constructor Detail

Base32

public Base32()

Method Detail

encode

public static char[] encode(byte[] aInput)
                     throws XcodeException

Encode a byte array into a base 32 sequence

Parameters:

aInput - the array of bytes on the range [0x00 - 0xff]

Returns:

Base 32 encoded string

Throws:

XcodeException - if the input string is null or with length == 0 or the input cannot be convert to a base-32 string.

decode

public static byte[] decode(char[] aInput)
                     throws XcodeException

Decode a base 32 sequence into an array of bytes

Parameters:

aInput - Base 32 encoded string

Returns:

a byte array

Throws:

XcodeException - if the input string is null or with length == 0 or the input cannot be convert to a native string.