001 /**************************************************************** 002 * Licensed to the Apache Software Foundation (ASF) under one * 003 * or more contributor license agreements. See the NOTICE file * 004 * distributed with this work for additional information * 005 * regarding copyright ownership. The ASF licenses this file * 006 * to you under the Apache License, Version 2.0 (the * 007 * "License"); you may not use this file except in compliance * 008 * with the License. You may obtain a copy of the License at * 009 * * 010 * http://www.apache.org/licenses/LICENSE-2.0 * 011 * * 012 * Unless required by applicable law or agreed to in writing, * 013 * software distributed under the License is distributed on an * 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * 015 * KIND, either express or implied. See the License for the * 016 * specific language governing permissions and limitations * 017 * under the License. * 018 ****************************************************************/ 019 020 package org.apache.james.mime4j.codec; 021 022 import java.io.FilterOutputStream; 023 import java.io.IOException; 024 import java.io.OutputStream; 025 026 /** 027 * Performs Quoted-Printable encoding on an underlying stream. 028 */ 029 public class QuotedPrintableOutputStream extends FilterOutputStream { 030 031 private QuotedPrintableEncoder encoder; 032 private boolean closed = false; 033 034 public QuotedPrintableOutputStream(OutputStream out, boolean binary) { 035 super(out); 036 encoder = new QuotedPrintableEncoder(CodecUtil.DEFAULT_ENCODING_BUFFER_SIZE, binary); 037 encoder.initEncoding(out); 038 } 039 040 @Override 041 public void close() throws IOException { 042 if (closed) 043 return; 044 045 try { 046 encoder.completeEncoding(); 047 // do not close the wrapped stream 048 } finally { 049 closed = true; 050 } 051 } 052 053 @Override 054 public void flush() throws IOException { 055 encoder.flushOutput(); 056 } 057 058 @Override 059 public void write(int b) throws IOException { 060 this.write(new byte[] { (byte) b }, 0, 1); 061 } 062 063 @Override 064 public void write(byte[] b, int off, int len) throws IOException { 065 if (closed) { 066 throw new IOException("QuotedPrintableOutputStream has been closed"); 067 } 068 069 encoder.encodeChunk(b, off, len); 070 } 071 072 }