+++ /dev/null
-/**
- * Jexer - Java Text User Interface
- *
- * License: LGPLv3 or later
- *
- * This module is licensed under the GNU Lesser General Public License
- * Version 3. Please see the file "COPYING" in this directory for more
- * information about the GNU Lesser General Public License Version 3.
- *
- * Copyright (C) 2015 Kevin Lamonte
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public License
- * as published by the Free Software Foundation; either version 3 of
- * the License, or (at your option) any later version.
- *
- * This program 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 Lesser General Public
- * License along with this program; if not, see
- * http://www.gnu.org/licenses/, or write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- *
- * @author Kevin Lamonte [kevin.lamonte@gmail.com]
- * @version 1
- */
-package jexer.net;
-
-import java.io.OutputStream;
-import java.io.IOException;
-
-/**
- * TelnetOutputStream works with TelnetSocket to perform the telnet protocol.
- */
-public final class TelnetOutputStream extends OutputStream {
-
- /**
- * The root TelnetSocket that has my telnet protocol state.
- */
- private TelnetSocket master;
-
- /**
- * The raw socket's OutputStream.
- */
- private OutputStream output;
-
- /**
- * Package private constructor.
- *
- * @param master the master TelnetSocket
- * @param output the underlying socket's OutputStream
- */
- TelnetOutputStream(TelnetSocket master, OutputStream output) {
- this.master = master;
- this.output = output;
- }
-
- // OutputStream interface -------------------------------------------------
-
- /**
- * Closes this output stream and releases any system resources associated
- * with this stream.
- */
- @Override
- public void close() throws IOException {
- if (output != null) {
- output.close();
- output = null;
- }
- }
-
- /**
- * Flushes this output stream and forces any buffered output bytes to be
- * written out.
- */
- @Override
- public void flush() throws IOException {
- if ((master.nvt.binaryMode == false) && (master.nvt.writeCR == true)) {
- // The last byte sent to this.write() was a CR, which was never
- // actually sent. So send the CR in ascii mode, then flush.
- // CR <anything> -> CR NULL
- output.write(master.C_CR);
- output.write(master.C_NUL);
- master.nvt.writeCR = false;
- }
- output.flush();
- }
-
- /**
- * Writes b.length bytes from the specified byte array to this output
- * stream.
- */
- @Override
- public void write(byte[] b) throws IOException {
- writeImpl(b, 0, b.length);
- }
-
- /**
- * Writes len bytes from the specified byte array starting at offset off
- * to this output stream.
- */
- @Override
- public void write(byte[] b, int off, int len) throws IOException {
- writeImpl(b, off, len);
- }
-
- /**
- * Writes the specified byte to this output stream.
- */
- @Override
- public void write(int b) throws IOException {
- byte [] bytes = new byte[1];
- bytes[0] = (byte)b;
- writeImpl(bytes, 0, 1);
- }
-
- /**
- * Writes b.length bytes from the specified byte array to this output
- * stream. Note package private access.
- */
- void rawWrite(byte[] b) throws IOException {
- output.write(b, 0, b.length);
- }
-
- /**
- * Writes len bytes from the specified byte array starting at offset off
- * to this output stream.
- */
- private void writeImpl(final byte[] b, final int off,
- final int len) throws IOException {
-
- byte [] writeBuffer = new byte[Math.max(len, 4)];
- int writeBufferI = 0;
-
- for (int i = 0; i < len; i++) {
- if (writeBufferI >= writeBuffer.length - 4) {
- // Flush what we have generated so far and reset the buffer,
- // because the next byte could generate up to 4 output bytes
- // (CR <something> <IAC> <IAC>).
- super.write(writeBuffer, 0, writeBufferI);
- writeBufferI = 0;
- }
-
- // Pull the next byte
- byte ch = b[i + off];
-
- if (master.nvt.binaryMode == true) {
-
- if (ch == master.TELNET_IAC) {
- // IAC -> IAC IAC
- writeBuffer[writeBufferI++] = (byte)master.TELNET_IAC;
- writeBuffer[writeBufferI++] = (byte)master.TELNET_IAC;
- } else {
- // Anything else -> just send
- writeBuffer[writeBufferI++] = ch;
- }
- continue;
- }
-
- // Non-binary mode: more complicated. We use writeCR to handle
- // the case that the last byte of b was a CR.
-
- // Bare carriage return -> CR NUL
- if (ch == master.C_CR) {
- if (master.nvt.writeCR == true) {
- // Flush the previous CR to the stream.
- // CR <anything> -> CR NULL
- writeBuffer[writeBufferI++] = (byte)master.C_CR;
- writeBuffer[writeBufferI++] = (byte)master.C_NUL;
- }
- master.nvt.writeCR = true;
- } else if (ch == master.C_LF) {
- if (master.nvt.writeCR == true) {
- // CR LF -> CR LF
- writeBuffer[writeBufferI++] = (byte)master.C_CR;
- writeBuffer[writeBufferI++] = (byte)master.C_LF;
- master.nvt.writeCR = false;
- } else {
- // Bare LF -> LF
- writeBuffer[writeBufferI++] = ch;
- }
- } else if (ch == master.TELNET_IAC) {
- if (master.nvt.writeCR == true) {
- // CR <anything> -> CR NULL
- writeBuffer[writeBufferI++] = (byte)master.C_CR;
- writeBuffer[writeBufferI++] = (byte)master.C_NUL;
- master.nvt.writeCR = false;
- }
- // IAC -> IAC IAC
- writeBuffer[writeBufferI++] = (byte)master.TELNET_IAC;
- writeBuffer[writeBufferI++] = (byte)master.TELNET_IAC;
- } else {
- if (master.nvt.writeCR == true) {
- // CR <anything> -> CR NULL
- writeBuffer[writeBufferI++] = (byte)master.C_CR;
- writeBuffer[writeBufferI++] = (byte)master.C_NUL;
- master.nvt.writeCR = false;
- } else {
- // Normal character */
- writeBuffer[writeBufferI++] = ch;
- }
- }
-
- } // while (i < userbuf.length)
-
- if (writeBufferI > 0) {
- // Flush what we have generated so far and reset the buffer.
- super.write(writeBuffer, 0, writeBufferI);
- }
- }
-
-
-}
git://git.nikiroo.be / fanfix.git / blobdiff