Package net.i2p.data

Class Base64

java.lang.Object
net.i2p.data.Base64
public class Base64
extends Object
Encodes and decodes to and from Base64 notation.

Change Log:

  • v1.3.6 - Fixed OutputStream.flush() so that 'position' is reset.
  • v1.3.5 - Added flag to turn on and off line breaks. Fixed bug in input stream where last buffer being read, if not completely full, was not returned.
  • v1.3.4 - Fixed when "improperly padded stream" error was thrown at the wrong time.
  • v1.3.3 - Fixed I/O streams which were totally messed up.

I am placing this code in the Public Domain. Do with it as you will. This software comes with no guarantees or warranties but with plenty of well-wishing instead! Please visit http://iharder.net/xmlizable periodically to check for updates or to contribute improvements.

Modified by jrandom for i2p, using safeEncode / safeDecode to create filesystem and URL safe base64 values (replacing / with ~, and + with -)
Version:
1.3.4
Author:
Robert Harder, rob@iharder.net

  • Field Summary

    Fields 
    Modifier and Type Field Description
    static String ALPHABET_I2P
    The I2P Alphabet.

  • Method Summary

    Modifier and Type Method Description
    static byte[] decode​(String s)
    Decodes data from Base64 notation using the I2P alphabet.
    static byte[] decode​(String s, boolean useStandardAlphabet)
    Decodes data from Base64 notation using the I2P alphabet.
    static String decodeToString​(String s)
    Decodes data from Base64 notation and returns it as a string.
    static String encode​(byte[] source)
    Output will be a multiple of 4 chars, including 0-2 trailing '='
    static String encode​(byte[] source, boolean useStandardAlphabet)
    Output will be a multiple of 4 chars, including 0-2 trailing '='
    static String encode​(byte[] source, int off, int len)
    Output will be a multiple of 4 chars, including 0-2 trailing '='
    static String encode​(byte[] source, int off, int len, boolean useStandardAlphabet)
    Output will be a multiple of 4 chars, including 0-2 trailing '='
    static String encode​(String source)
    Output will be a multiple of 4 chars, including 0-2 trailing '=' As of 0.9.14, encodes the UTF-8 encoding of source.
    static void main​(String[] args)  

    Methods inherited from class java.lang.Object

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

  • Field Details

  • Method Details

    • encode

      public static String encode​(String source)
      Output will be a multiple of 4 chars, including 0-2 trailing '=' As of 0.9.14, encodes the UTF-8 encoding of source. Prior to that, used the platform's encoding.
      Parameters:
      source - if null will return ""

    • encode

      public static String encode​(byte[] source)
      Output will be a multiple of 4 chars, including 0-2 trailing '='
      Parameters:
      source - if null will return ""

    • encode

      public static String encode​(byte[] source, int off, int len)
      Output will be a multiple of 4 chars, including 0-2 trailing '='
      Parameters:
      source - if null will return ""

    • encode

      public static String encode​(byte[] source, boolean useStandardAlphabet)
      Output will be a multiple of 4 chars, including 0-2 trailing '='
      Parameters:
      source - if null will return ""
      useStandardAlphabet - Warning, must be false for I2P compatibility

    • encode

      public static String encode​(byte[] source, int off, int len, boolean useStandardAlphabet)
      Output will be a multiple of 4 chars, including 0-2 trailing '='
      Parameters:
      source - if null will return ""
      useStandardAlphabet - Warning, must be false for I2P compatibility

    • decode

      public static byte[] decode​(String s)
      Decodes data from Base64 notation using the I2P alphabet. As of 0.9.14, does not require trailing '=' if remaining bits are zero. Prior to that, trailing 1, 2, or 3 chars were ignored. As of 0.9.14, trailing garbage after an '=' will cause an error. Prior to that, it was ignored. As of 0.9.14, whitespace will cause an error. Prior to that, it was ignored.
      Parameters:
      s - Base 64 encoded string using the I2P alphabet A-Z, a-z, 0-9, -, ~
      Returns:
      the decoded data, null on error

    • decode

      public static byte[] decode​(String s, boolean useStandardAlphabet)
      Decodes data from Base64 notation using the I2P alphabet.
      Parameters:
      useStandardAlphabet - Warning, must be false for I2P compatibility
      Returns:
      the decoded data, null on error
      Since:
      0.9.25

    • main

      public static void main​(String[] args)

    • decodeToString

      public static String decodeToString​(String s)
      Decodes data from Base64 notation and returns it as a string. Equivlaent to calling new String( decode( s ) ) As of 0.9.14, decodes as UTF-8. Prior to that, it used the platform's encoding. For best results, decoded data should be 7 bit. As of 0.9.14, does not require trailing '=' if remaining bits are zero. Prior to that, trailing 1, 2, or 3 chars were ignored. As of 0.9.14, trailing garbage after an '=' will cause an error. Prior to that, it was ignored. As of 0.9.14, whitespace will cause an error. Prior to that, it was ignored.
      Parameters:
      s - the string to decode
      Returns:
      The data as a string, or null on error
      Since:
      1.4