com.ibm.misc
Class BASE64Encoder

java.lang.Object
  |
  +--com.ibm.misc.CharacterEncoder
        |
        +--com.ibm.misc.BASE64Encoder

public class BASE64Encoder
extends CharacterEncoder

This class implements a BASE64 Character encoder as specified in RFC1521. This RFC is part of the MIME specification as published by the Internet Engineering Task Force (IETF). Unlike some other encoding schemes there is nothing in this encoding that indicates where a buffer starts or ends. This means that the encoded text will simply start with the first line of encoded text and end with the last line of encoded text.

See Also:
CharacterEncoder, BASE64Decoder

Fields inherited from class com.ibm.misc.CharacterEncoder
pStream
 
Constructor Summary
BASE64Encoder()
           
 
Method Summary
protected  int bytesPerAtom()
          this class encodes three bytes per atom.
protected  int bytesPerLine()
          this class encodes 57 bytes per line.
protected  void encodeAtom(OutputStream outStream, byte[] data, int offset, int len)
          encodeAtom - Take three bytes of input and encode it as 4 printable characters.
 
Methods inherited from class com.ibm.misc.CharacterEncoder
encode, encode, encode, encodeBuffer, encodeBuffer, encodeBuffer, encodeBufferPrefix, encodeBufferSuffix, encodeLinePrefix, encodeLineSuffix, readFully
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

BASE64Encoder

public BASE64Encoder()
Method Detail

bytesPerAtom

protected int bytesPerAtom()
this class encodes three bytes per atom.
Overrides:
bytesPerAtom in class CharacterEncoder

bytesPerLine

protected int bytesPerLine()
this class encodes 57 bytes per line. This results in a maximum of 57/3 * 4 or 76 characters per output line. Not counting the line termination.
Overrides:
bytesPerLine in class CharacterEncoder

encodeAtom

protected void encodeAtom(OutputStream outStream,
                          byte[] data,
                          int offset,
                          int len)
                   throws IOException
encodeAtom - Take three bytes of input and encode it as 4 printable characters. Note that if the length in len is less than three is encodes either one or two '=' signs to indicate padding characters.
Overrides:
encodeAtom in class CharacterEncoder