| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.commons.net.io; |
| |
| import java.io.FilterOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /*** |
| * This class wraps an output stream, replacing all occurrences |
| * of <CR><LF> (carriage return followed by a linefeed), |
| * which is the NETASCII standard for representing a newline, with the |
| * local line separator representation. You would use this class to |
| * implement ASCII file transfers requiring conversion from NETASCII. |
| * <p> |
| * Because of the translation process, a call to <code>flush()</code> will |
| * not flush the last byte written if that byte was a carriage |
| * return. A call to {@link #close close() }, however, will |
| * flush the carriage return. |
| * <p> |
| * <p> |
| * @author Daniel F. Savarese |
| ***/ |
| |
| public final class FromNetASCIIOutputStream extends FilterOutputStream |
| { |
| private boolean __lastWasCR; |
| |
| /*** |
| * Creates a FromNetASCIIOutputStream instance that wraps an existing |
| * OutputStream. |
| * <p> |
| * @param output The OutputStream to wrap. |
| ***/ |
| public FromNetASCIIOutputStream(OutputStream output) |
| { |
| super(output); |
| __lastWasCR = false; |
| } |
| |
| |
| private void __write(int ch) throws IOException |
| { |
| switch (ch) |
| { |
| case '\r': |
| __lastWasCR = true; |
| // Don't write anything. We need to see if next one is linefeed |
| break; |
| case '\n': |
| if (__lastWasCR) |
| { |
| out.write(FromNetASCIIInputStream._lineSeparatorBytes); |
| __lastWasCR = false; |
| break; |
| } |
| __lastWasCR = false; |
| out.write('\n'); |
| break; |
| default: |
| if (__lastWasCR) |
| { |
| out.write('\r'); |
| __lastWasCR = false; |
| } |
| out.write(ch); |
| break; |
| } |
| } |
| |
| |
| /*** |
| * Writes a byte to the stream. Note that a call to this method |
| * might not actually write a byte to the underlying stream until a |
| * subsequent character is written, from which it can be determined if |
| * a NETASCII line separator was encountered. |
| * This is transparent to the programmer and is only mentioned for |
| * completeness. |
| * <p> |
| * @param ch The byte to write. |
| * @exception IOException If an error occurs while writing to the underlying |
| * stream. |
| ***/ |
| @Override |
| public synchronized void write(int ch) |
| throws IOException |
| { |
| if (FromNetASCIIInputStream._noConversionRequired) |
| { |
| out.write(ch); |
| return ; |
| } |
| |
| __write(ch); |
| } |
| |
| |
| /*** |
| * Writes a byte array to the stream. |
| * <p> |
| * @param buffer The byte array to write. |
| * @exception IOException If an error occurs while writing to the underlying |
| * stream. |
| ***/ |
| @Override |
| public synchronized void write(byte buffer[]) |
| throws IOException |
| { |
| write(buffer, 0, buffer.length); |
| } |
| |
| |
| /*** |
| * Writes a number of bytes from a byte array to the stream starting from |
| * a given offset. |
| * <p> |
| * @param buffer The byte array to write. |
| * @param offset The offset into the array at which to start copying data. |
| * @param length The number of bytes to write. |
| * @exception IOException If an error occurs while writing to the underlying |
| * stream. |
| ***/ |
| @Override |
| public synchronized void write(byte buffer[], int offset, int length) |
| throws IOException |
| { |
| if (FromNetASCIIInputStream._noConversionRequired) |
| { |
| // FilterOutputStream method is very slow. |
| //super.write(buffer, offset, length); |
| out.write(buffer, offset, length); |
| return ; |
| } |
| |
| while (length-- > 0) |
| __write(buffer[offset++]); |
| } |
| |
| |
| /*** |
| * Closes the stream, writing all pending data. |
| * <p> |
| * @exception IOException If an error occurs while closing the stream. |
| ***/ |
| @Override |
| public synchronized void close() |
| throws IOException |
| { |
| if (FromNetASCIIInputStream._noConversionRequired) |
| { |
| super.close(); |
| return ; |
| } |
| |
| if (__lastWasCR) |
| out.write('\r'); |
| super.close(); |
| } |
| } |