sun.misc

Class BASE64Decoder

java.lang.Object

sun.misc.CharacterDecoder

sun.misc.BASE64Decoder

public class BASE64Decoder
extends CharacterDecoder

This class implements a BASE64 Character decoder as specified in RFC1521. This RFC is part of the MIME specification which is published by the Internet Engineering Task Force (IETF). Unlike some other encoding schemes there is nothing in this encoding that tells the decoder where a buffer starts or stops, so to use it you will need to isolate your encoded data into a single chunk and then feed them this decoder. The simplest way to do that is to read all of the encoded data into a string and then use:

      byte    mydata[];
      BASE64Decoder base64 = new BASE64Decoder();

      mydata = base64.decodeBuffer(bufferString);
 

This will decode the String in bufferString and give you an array of bytes in the array myData. On errors, this class throws a CEFormatException with the following detail strings:

    "BASE64Decoder: Not enough bytes for an atom."
 

Author:

Chuck McManis

See Also:

CharacterEncoder, BASE64Decoder

Constructor Summary

Constructors

Constructor and Description
BASE64Decoder()

Method Summary

Methods

Modifier and Type	Method and Description
protected int	bytesPerAtom() This class has 4 bytes per atom
protected int	bytesPerLine() Any multiple of 4 will do, 72 might be common
protected void	decodeAtom(java.io.PushbackInputStream inStream, java.io.OutputStream outStream, int rem) Decode one BASE64 atom into 1, 2, or 3 bytes of data.

Methods inherited from class sun.misc.CharacterDecoder

decodeBuffer, decodeBuffer, decodeBuffer, decodeBufferPrefix, decodeBufferSuffix, decodeBufferToByteBuffer, decodeBufferToByteBuffer, decodeLinePrefix, decodeLineSuffix, readFully

Methods inherited from class java.lang.Object

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

Constructor Detail

BASE64Decoder

public BASE64Decoder()

Method Detail

bytesPerAtom

protected int bytesPerAtom()

This class has 4 bytes per atom

Specified by:

bytesPerAtom in class CharacterDecoder

bytesPerLine

protected int bytesPerLine()

Any multiple of 4 will do, 72 might be common

Specified by:

bytesPerLine in class CharacterDecoder

decodeAtom

protected void decodeAtom(java.io.PushbackInputStream inStream,
              java.io.OutputStream outStream,
              int rem)
                   throws java.io.IOException

Decode one BASE64 atom into 1, 2, or 3 bytes of data.

Overrides:

decodeAtom in class CharacterDecoder

Throws:

java.io.IOException