/*
* Copyright (c) 2003, KNOPFLERFISH project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* - Neither the name of the KNOPFLERFISH project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.knopflerfish.bundle.consoletelnet;
import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;
/**
* * This extension of a PrintWriter makes the following * translations on data
* in the output stream * * CR LF -> no change * CR <n>, when n != LF -> CR NULL
* <n> * <n> LF -> <n> CR LF * * All characters in the output buffer are * anded
* with a mask from the session. * This mask is either 0x7F (7 bit) or 0xFF (8
* bit) * * It also has a clear method to empty the output buffer * and a
* writeCommand method to send telnet commands. *
*/
public class TelnetPrintWriter extends PrintWriter {
private TelnetSession ts;
private CharArrayWriter caw; // Intermediate array writer
private PrintWriter pw2; // Private PrintWriter
private boolean prevWasCR = false;
public TelnetPrintWriter(OutputStream os, TelnetStateMachine tsm,
TelnetSession ts) {
super(os);
this.ts = ts;
Writer w1 = super.out; // get the underlaying writer
caw = new CharArrayWriter(); // intermediate array writer
super.out = caw; // replace underlying Writer with a CharArrayWriter
pw2 = new PrintWriter(w1); // a private PrintWriter
}
/**
* * Override flusg and close methods,
*/
public void flush() {
caw.flush();
pribuf();
pw2.flush();
}
public void close() {
flush();
caw.close();
pw2.close();
}
/**
* * Override all println methods, add CRLF as end of line
*/
public synchronized void println() {
// super.println();
write(TCC.CR);
write(TCC.LF);
flush();
}
public synchronized void println(boolean b) {
super.print(b);
this.println();
}
public synchronized void println(char c) {
synchronized (this) {
super.print(c);
this.println();
}
}
public synchronized void println(int i) {
super.print(i);
this.println();
}
public synchronized void println(long l) {
super.print(l);
this.println();
}
public synchronized void println(float f) {
super.print(f);
this.println();
}
public synchronized void println(double d) {
super.print(d);
this.println();
}
public synchronized void println(char[] c) {
super.print(c);
this.println();
}
public synchronized void println(String s) {
synchronized (this) {
super.print(s);
this.println();
}
}
public synchronized void println(Object o) {
super.print(o);
this.println();
}
/**
* * Override all write methods, write to internal buffer first
*/
public synchronized void write(char[] buf) {
caw.write(buf, 0, buf.length);
}
public synchronized void write(char[] buf, int off, int len) {
caw.write(buf, off, len);
}
public synchronized void write(String s) {
synchronized (this) {
try {
caw.write(s);
} catch (IOException iox) {
System.out
.println("Exception in TelnetPrintWriter write (String) "
+ iox.toString());
}
}
}
public synchronized void write(int c) {
caw.write(c);
}
public synchronized void write(String s, int off, int len) {
caw.write(s, off, len);
}
/**
* * Scan the output buffer for CR<n> where n != LF, * which is translated
* it to CR NULL n
*/
private synchronized void pribuf() {
char[] buf = caw.toCharArray();
caw.reset();
char mask = ts.getMask();
for (int i = 0; i < buf.length; i++) {
if (prevWasCR == true) {
if (buf[i] != TCC.LF_char) { // add a NULL
pw2.write(TCC.NULL_char);
pw2.write(buf[i] & mask);
} else {
pw2.write(buf[i] & mask);
}
} else {
if (buf[i] == TCC.LF_char) { // a single LF -> CRLF
pw2.write(TCC.CR_char);
pw2.write(TCC.LF_char);
} else {
pw2.write(buf[i] & mask);
}
}
prevWasCR = (buf[i] == TCC.CR_char) ? true : false;
}
// pw2.flush();
}
public synchronized void reset() {
caw.reset();
}
/**
* * Write a telnet command in the output stream. * *
*
* @parameter tc, command string to write
*/
public synchronized void writeCommand(String tc) {
if (tc != null) {
pw2.print(tc);
pw2.flush();
}
}
}