| /* CRLFOutputStream.java -- |
| Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.net; |
| |
| import java.io.FilterOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.UnsupportedEncodingException; |
| |
| /** |
| * An output stream that filters LFs into CR/LF pairs. |
| * |
| * @author Chris Burdess (dog@gnu.org) |
| */ |
| public class CRLFOutputStream |
| extends FilterOutputStream |
| { |
| static final String US_ASCII = "US-ASCII"; |
| |
| /** |
| * The CR octet. |
| */ |
| public static final int CR = 13; |
| |
| /** |
| * The LF octet. |
| */ |
| public static final int LF = 10; |
| |
| /** |
| * The CR/LF pair. |
| */ |
| public static final byte[] CRLF = { CR, LF }; |
| |
| /** |
| * The last byte read. |
| */ |
| protected int last; |
| |
| /** |
| * Constructs a CR/LF output stream connected to the specified output stream. |
| */ |
| public CRLFOutputStream(OutputStream out) |
| { |
| super(out); |
| last = -1; |
| } |
| |
| /** |
| * Writes a character to the underlying stream. |
| * @exception IOException if an I/O error occurred |
| */ |
| public void write(int ch) throws IOException |
| { |
| if (ch == CR) |
| { |
| out.write(CRLF); |
| } |
| else if (ch == LF) |
| { |
| if (last != CR) |
| { |
| out.write(CRLF); |
| } |
| } |
| else |
| { |
| out.write(ch); |
| } |
| last = ch; |
| } |
| |
| /** |
| * Writes a byte array to the underlying stream. |
| * @exception IOException if an I/O error occurred |
| */ |
| public void write(byte[] b) |
| throws IOException |
| { |
| write(b, 0, b.length); |
| } |
| |
| /** |
| * Writes a portion of a byte array to the underlying stream. |
| * @exception IOException if an I/O error occurred |
| */ |
| public void write(byte[] b, int off, int len) |
| throws IOException |
| { |
| int d = off; |
| len += off; |
| for (int i = off; i < len; i++) |
| { |
| switch (b[i]) |
| { |
| case CR: |
| out.write (b, d, i - d); |
| out.write (CRLF, 0, 2); |
| d = i + 1; |
| break; |
| case LF: |
| if (last != CR) |
| { |
| out.write (b, d, i - d); |
| out.write (CRLF, 0, 2); |
| } |
| d = i + 1; |
| break; |
| } |
| last = b[i]; |
| } |
| if (len - d > 0) |
| { |
| out.write (b, d, len - d); |
| } |
| } |
| |
| /** |
| * Writes the specified ASCII string to the underlying stream. |
| * @exception IOException if an I/O error occurred |
| */ |
| public void write(String text) |
| throws IOException |
| { |
| try |
| { |
| byte[] bytes = text.getBytes(US_ASCII); |
| write(bytes, 0, bytes.length); |
| } |
| catch (UnsupportedEncodingException e) |
| { |
| throw new IOException("The US-ASCII encoding is not supported " + |
| "on this system"); |
| } |
| } |
| |
| /** |
| * Writes a newline to the underlying stream. |
| * @exception IOException if an I/O error occurred |
| */ |
| public void writeln() |
| throws IOException |
| { |
| out.write(CRLF, 0, 2); |
| } |
| } |
| |