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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
package org.ietf.ldap.util;
/** Implements a plaintext -> Base64 encoder.
*/
public final class MimeBase64Encoder extends MimeEncoder {
static final long serialVersionUID = 8781620079813078315L;
private int buf = 0; // a 24-bit quantity
private int buf_bytes = 0; // how many octets are set in it
private byte line[] = new byte[74]; // output buffer
private int line_length = 0; // output buffer fill pointer
static private final byte crlf[] = "\r\n".getBytes();
static private final char map[] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 0-7
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 8-15
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 16-23
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', // 24-31
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', // 32-39
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', // 40-47
'w', 'x', 'y', 'z', '0', '1', '2', '3', // 48-55
'4', '5', '6', '7', '8', '9', '+', '/', // 56-63
};
private final void encode_token() {
int i = line_length;
line[i] = (byte)map[0x3F & (buf >> 18)]; // sextet 1 (octet 1)
line[i+1] = (byte)map[0x3F & (buf >> 12)]; // sextet 2 (octet 1 and 2)
line[i+2] = (byte)map[0x3F & (buf >> 6)]; // sextet 3 (octet 2 and 3)
line[i+3] = (byte)map[0x3F & buf]; // sextet 4 (octet 3)
line_length += 4;
buf = 0;
buf_bytes = 0;
}
private final void encode_partial_token() {
int i = line_length;
line[i] = (byte)map[0x3F & (buf >> 18)]; // sextet 1 (octet 1)
line[i+1] = (byte)map[0x3F & (buf >> 12)]; // sextet 2 (octet 1 and 2)
if (buf_bytes == 1)
line[i+2] = (byte)'=';
else
line[i+2] = (byte)map[0x3F & (buf >> 6)]; // sextet 3 (octet 2 and 3)
if (buf_bytes <= 2)
line[i+3] = (byte)'=';
else
line[i+3] = (byte)map[0x3F & buf]; // sextet 4 (octet 3)
line_length += 4;
buf = 0;
buf_bytes = 0;
}
private final void flush_line(ByteBuf out) {
out.append(line, 0, line_length);
line_length = 0;
}
/** Given a sequence of input bytes, produces a sequence of output bytes
using the base64 encoding. If there are bytes in `out' already, the
new bytes are appended, so the caller should do `out.setLength(0)'
first if that's desired.
*/
public final void translate(ByteBuf in, ByteBuf out) {
byte inb[] = in.toBytes();
int in_length = in.length();
for (int i = 0; i < in_length; i++) {
if (buf_bytes == 0)
buf = (buf & 0x00FFFF) | (inb[i] << 16);
else if (buf_bytes == 1)
buf = (buf & 0xFF00FF) | ((inb[i] << 8) & 0x00FFFF);
else
buf = (buf & 0xFFFF00) | (inb[i] & 0x0000FF);
if ((++buf_bytes) == 3) {
encode_token();
if (line_length >= 72) {
flush_line(out);
}
}
if (i == (in_length-1)) {
if ((buf_bytes > 0) && (buf_bytes < 3))
encode_partial_token();
if (line_length > 0)
flush_line(out);
}
}
for (int i=0; i<line.length; i++)
line[i] = 0;
}
/** Tell the base64 encoder that no more input data will be forthcoming.
This may result in output, as a result of flushing the internal buffer.
This object must not be used again after calling eof(). If there are
bytes in `out' already, the new bytes are appended, so the caller should
do `out.setLength(0)' first if that's desired.
*/
public final void eof(ByteBuf out) {
if (buf_bytes != 0)
encode_partial_token();
flush_line(out);
for (int i=0; i<line.length; i++)
line[i] = 0;
}
}
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