--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/net/TelnetOutputStream.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,140 @@
+/*
+ * Copyright 1994-2002 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package sun.net;
+
+import java.io.*;
+
+/**
+ * This class provides input and output streams for telnet clients.
+ * This class overrides write to do CRLF processing as specified in
+ * RFC 854. The class assumes it is running on a system where lines
+ * are terminated with a single newline <LF> character.
+ *
+ * This is the relevant section of RFC 824 regarding CRLF processing:
+ *
+ * <pre>
+ * The sequence "CR LF", as defined, will cause the NVT to be
+ * positioned at the left margin of the next print line (as would,
+ * for example, the sequence "LF CR").  However, many systems and
+ * terminals do not treat CR and LF independently, and will have to
+ * go to some effort to simulate their effect.  (For example, some
+ * terminals do not have a CR independent of the LF, but on such
+ * terminals it may be possible to simulate a CR by backspacing.)
+ * Therefore, the sequence "CR LF" must be treated as a single "new
+ * line" character and used whenever their combined action is
+ * intended; the sequence "CR NUL" must be used where a carriage
+ * return alone is actually desired; and the CR character must be
+ * avoided in other contexts.  This rule gives assurance to systems
+ * which must decide whether to perform a "new line" function or a
+ * multiple-backspace that the TELNET stream contains a character
+ * following a CR that will allow a rational decision.
+ *
+ *    Note that "CR LF" or "CR NUL" is required in both directions
+ *    (in the default ASCII mode), to preserve the symmetry of the
+ *    NVT model.  Even though it may be known in some situations
+ *    (e.g., with remote echo and suppress go ahead options in
+ *    effect) that characters are not being sent to an actual
+ *    printer, nonetheless, for the sake of consistency, the protocol
+ *    requires that a NUL be inserted following a CR not followed by
+ *    a LF in the data stream.  The converse of this is that a NUL
+ *    received in the data stream after a CR (in the absence of
+ *    options negotiations which explicitly specify otherwise) should
+ *    be stripped out prior to applying the NVT to local character
+ *    set mapping.
+ * </pre>
+ *
+ * @author      Jonathan Payne
+ */
+
+public class TelnetOutputStream extends BufferedOutputStream {
+    boolean         stickyCRLF = false;
+    boolean         seenCR = false;
+
+    public boolean  binaryMode = false;
+
+    public TelnetOutputStream(OutputStream fd, boolean binary) {
+        super(fd);
+        binaryMode = binary;
+    }
+
+    /**
+     * set the stickyCRLF flag. Tells wether the terminal considers CRLF as a single
+     * char.
+     *
+     * @param   on      the <code>boolean</code> to set the flag to.
+     */
+    public void setStickyCRLF(boolean on) {
+        stickyCRLF = on;
+    }
+
+    /**
+     * Writes the int to the stream and does CR LF processing if necessary.
+     */
+    public void write(int c) throws IOException {
+        if (binaryMode) {
+            super.write(c);
+            return;
+        }
+
+        if (seenCR) {
+            if (c != '\n')
+                super.write(0);
+            super.write(c);
+            if (c != '\r')
+                seenCR = false;
+        } else { // !seenCR
+            if (c == '\n') {
+                super.write('\r');
+                super.write('\n');
+                return;
+            }
+            if (c == '\r') {
+                if (stickyCRLF)
+                    seenCR = true;
+                else {
+                    super.write('\r');
+                    c = 0;
+                }
+            }
+            super.write(c);
+        }
+    }
+
+    /**
+     * Write the bytes at offset <i>off</i> in buffer <i>bytes</i> for
+     * <i>length</i> bytes.
+     */
+    public void write(byte bytes[], int off, int length) throws IOException {
+        if (binaryMode) {
+            super.write(bytes, off, length);
+            return;
+        }
+
+        while (--length >= 0) {
+            write(bytes[off++]);
+        }
+    }
+}