sonews-drupal: src/org/sonews/util/io/CRLFOutputStream.java@03cc47e9daee

     1 /* CRLFOutputStream.java --

     2 Copyright (C) 2002, 2003, 2004  Free Software Foundation, Inc.

     4 This file is part of GNU Classpath.

     6 GNU Classpath is free software; you can redistribute it and/or modify

     7 it under the terms of the GNU General Public License as published by

     8 the Free Software Foundation; either version 2, or (at your option)

     9 any later version.

    11 GNU Classpath is distributed in the hope that it will be useful, but

    12 WITHOUT ANY WARRANTY; without even the implied warranty of

    13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    14 General Public License for more details.

    16 You should have received a copy of the GNU General Public License

    17 along with GNU Classpath; see the file COPYING.  If not, write to the

    18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

    19 02110-1301 USA.

    21 Linking this library statically or dynamically with other modules is

    22 making a combined work based on this library.  Thus, the terms and

    23 conditions of the GNU General Public License cover the whole

    24 combination.

    26 As a special exception, the copyright holders of this library give you

    27 permission to link this library with independent modules to produce an

    28 executable, regardless of the license terms of these independent

    29 modules, and to copy and distribute the resulting executable under

    30 terms of your choice, provided that you also meet, for each linked

    31 independent module, the terms and conditions of the license of that

    32 module.  An independent module is a module which is not derived from

    33 or based on this library.  If you modify this library, you may extend

    34 this exception to your version of the library, but you are not

    35 obligated to do so.  If you do not wish to do so, delete this

    36 exception statement from your version.

    37  */

    38 package org.sonews.util.io; // original package: gnu.java.net

    40 import java.io.FilterOutputStream;

    41 import java.io.IOException;

    42 import java.io.OutputStream;

    43 import java.io.UnsupportedEncodingException;

    45 /**

    46  * An output stream that filters LFs into CR/LF pairs.

    47  *

    48  * @author Chris Burdess (dog@gnu.org)

    49  * @version classpath-0.98

    50  */

    51 public class CRLFOutputStream extends FilterOutputStream {

    53 	static final String US_ASCII = "US-ASCII";

    54 	/**

    55 	 * The CR octet.

    56 	 */

    57 	public static final int CR = 13;

    58 	/**

    59 	 * The LF octet.

    60 	 */

    61 	public static final int LF = 10;

    62 	/**

    63 	 * The CR/LF pair.

    64 	 */

    65 	public static final byte[] CRLF = {CR, LF};

    66 	/**

    67 	 * The last byte read.

    68 	 */

    69 	protected int last;

    71 	/**

    72 	 * Constructs a CR/LF output stream connected to the specified output stream.

    73 	 */

    74 	public CRLFOutputStream(OutputStream out) {

    75 		super(out);

    76 		last = -1;

    77 	}

    79 	/**

    80 	 * Writes a character to the underlying stream.

    81 	 * @exception IOException if an I/O error occurred

    82 	 */

    83 	@Override

    84 	public void write(int ch) throws IOException {

    85 		if (ch == CR) {

    86 			out.write(CRLF);

    87 		} else if (ch == LF) {

    88 			if (last != CR) {

    89 				out.write(CRLF);

    90 			}

    91 		} else {

    92 			out.write(ch);

    93 		}

    94 		last = ch;

    95 	}

    97 	/**

    98 	 * Writes a byte array to the underlying stream.

    99 	 * @exception IOException if an I/O error occurred

   100 	 */

   101 	@Override

   102 	public void write(byte[] b) throws IOException {

   103 		write(b, 0, b.length);

   104 	}

   106 	/**

   107 	 * Writes a portion of a byte array to the underlying stream.

   108 	 * @exception IOException if an I/O error occurred

   109 	 */

   110 	@Override

   111 	public void write(byte[] b, int off, int len) throws IOException {

   112 		int d = off;

   113 		len += off;

   114 		for (int i = off; i < len; i++) {

   115 			switch (b[i]) {

   116 				case CR:

   117 					out.write(b, d, i - d);

   118 					out.write(CRLF, 0, 2);

   119 					d = i + 1;

   120 					break;

   121 				case LF:

   122 					if (last != CR) {

   123 						out.write(b, d, i - d);

   124 						out.write(CRLF, 0, 2);

   125 					}

   126 					d = i + 1;

   127 					break;

   128 			}

   129 			last = b[i];

   130 		}

   131 		if (len - d > 0) {

   132 			out.write(b, d, len - d);

   133 		}

   134 	}

   136 	/**

   137 	 * Writes the specified ASCII string to the underlying stream.

   138 	 * @exception IOException if an I/O error occurred

   139 	 */

   140 	public void write(String text) throws IOException {

   141 		try {

   142 			byte[] bytes = text.getBytes(US_ASCII);

   143 			write(bytes, 0, bytes.length);

   144 		} catch (UnsupportedEncodingException e) {

   145 			throw new IOException("The US-ASCII encoding is not supported on this system", e);

   146 		}

   147 	}

   149 	/**

   150 	 * Writes a newline to the underlying stream.

   151 	 * @exception IOException if an I/O error occurred

   152 	 */

   153 	public void writeln() throws IOException {

   154 		out.write(CRLF, 0, 2);

   155 	}

   156 }

author	František Kučera <franta-hg@frantovo.cz>
	Tue, 25 Oct 2011 14:10:55 +0200
changeset 109	03cc47e9daee
parent 108	fdc075324ef3
permissions	-rw-r--r--