sun.misc
Class BASE64Encoder

java.lang.Object
  sun.misc.CharacterEncoder
      sun.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

Field Summary

Fields inherited from class sun.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 sun.misc.CharacterEncoder

encode, encode, encode, encode, encode, encodeBuffer, encodeBuffer, 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.

Specified by:

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.

Specified by:

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.

Specified by:

encodeAtom in class CharacterEncoder

Throws:

IOException