gnu.java.zrtp.utils

Class Base32

java.lang.Object

gnu.java.zrtp.utils.Base32

public class Base32
extends Object

Author:

Werner Dittmann <Werner.Dittmann@t-online.de>

Constructor Summary

Constructors

Constructor and Description
Base32()

Method Summary

Modifier and Type	Method and Description
static byte[]	ascii2binary(String cs, int lengthInBits) Decode a Base32 string into binary data.
static String	binary2ascii(byte[] os, int lengthInBits) Encode binary data into a Base32 string.
static int	divceil(int a, int b)

Methods inherited from class java.lang.Object

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

Constructor Detail

Base32

public Base32()

Method Detail

divceil

public static int divceil(int a,
                          int b)

binary2ascii

public static String binary2ascii(byte[] os,
                                  int lengthInBits)

Encode binary data into a Base32 string. The method returns a string that contains the base32 encoded data.

Parameters:

os - The byte array containing the binary data. The length must be at least (lengthInBits + 7) / 8 .

lengthInBits - Defines how may bits of the binary data shall be encoded into a base32 string.

Returns:

The string containing the base32 encoded data.

ascii2binary

public static byte[] ascii2binary(String cs,
                                  int lengthInBits)

Decode a Base32 string into binary data. The method returns a byte array that contains the binary data that was decoded from the base32 string.

Parameters:

cs - The String containing the base32 data. The length must be at least (lengthInBits + 5 - 1) / 5 characters .

lengthInBits - Defines how may bits shall be decoded from the String.

Returns:

The byte array containg the decoded data.