+++ /dev/null
-/*
- * Jexer - Java Text User Interface
- *
- * The MIT License (MIT)
- *
- * Copyright (C) 2019 Kevin Lamonte
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- *
- * @author Kevin Lamonte [kevin.lamonte@gmail.com]
- * @version 1
- */
-package jexer.net;
-
-import java.io.OutputStream;
-import java.io.IOException;
-
-import static jexer.net.TelnetSocket.*;
-
-/**
- * TelnetOutputStream works with TelnetSocket to perform the telnet protocol.
- */
-public class TelnetOutputStream extends OutputStream {
-
- // ------------------------------------------------------------------------
- // Variables --------------------------------------------------------------
- // ------------------------------------------------------------------------
-
- /**
- * The root TelnetSocket that has my telnet protocol state.
- */
- private TelnetSocket master;
-
- /**
- * The raw socket's OutputStream.
- */
- private OutputStream output;
-
- /**
- * When true, the last byte the caller passed to write() was a CR.
- */
- private boolean writeCR = false;
-
- // ------------------------------------------------------------------------
- // Constructors -----------------------------------------------------------
- // ------------------------------------------------------------------------
-
- /**
- * Package private constructor.
- *
- * @param master the master TelnetSocket
- * @param output the underlying socket's OutputStream
- */
- TelnetOutputStream(final TelnetSocket master, final OutputStream output) {
- this.master = master;
- this.output = output;
- }
-
- // ------------------------------------------------------------------------
- // OutputStrem ------------------------------------------------------------
- // ------------------------------------------------------------------------
-
- /**
- * Closes this output stream and releases any system resources associated
- * with this stream.
- *
- * @throws IOException if an I/O error occurs
- */
- @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.
- *
- * @throws IOException if an I/O error occurs
- */
- @Override
- public void flush() throws IOException {
- if ((master.binaryMode == false) && (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(C_CR);
- output.write(C_NUL);
- writeCR = false;
- }
- output.flush();
- }
-
- /**
- * Writes b.length bytes from the specified byte array to this output
- * stream.
- *
- * @param b the data.
- * @throws IOException if an I/O error occurs
- */
- @Override
- public void write(final 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.
- *
- * @param b the data.
- * @param off the start offset in the data.
- * @param len the number of bytes to write.
- * @throws IOException if an I/O error occurs
- */
- @Override
- public void write(final byte[] b, final int off,
- final int len) throws IOException {
-
- writeImpl(b, off, len);
- }
-
- /**
- * Writes the specified byte to this output stream.
- *
- * @param b the byte to write.
- * @throws IOException if an I/O error occurs
- */
- @Override
- public void write(final int b) throws IOException {
- byte [] bytes = new byte[1];
- bytes[0] = (byte) b;
- writeImpl(bytes, 0, 1);
- }
-
- // ------------------------------------------------------------------------
- // TelnetOutputStrem ------------------------------------------------------
- // ------------------------------------------------------------------------
-
- /**
- * Writes b.length bytes from the specified byte array to this output
- * stream. Note package private access.
- *
- * @param b the data.
- * @throws IOException if an I/O error occurs
- */
- void rawWrite(final 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.
- *
- * @param b the data.
- * @param off the start offset in the data.
- * @param len the number of bytes to write.
- * @throws IOException if an I/O error occurs
- */
- 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>).
- output.write(writeBuffer, 0, writeBufferI);
- writeBufferI = 0;
- }
-
- // Pull the next byte
- byte ch = b[i + off];
-
- if (master.binaryMode == true) {
-
- if (ch == TELNET_IAC) {
- // IAC -> IAC IAC
- writeBuffer[writeBufferI++] = (byte) TELNET_IAC;
- writeBuffer[writeBufferI++] = (byte) 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 == C_CR) {
- if (writeCR == true) {
- // Flush the previous CR to the stream.
- // CR <anything> -> CR NULL
- writeBuffer[writeBufferI++] = (byte) C_CR;
- writeBuffer[writeBufferI++] = (byte) C_NUL;
- }
- writeCR = true;
- } else if (ch == C_LF) {
- if (writeCR == true) {
- // CR LF -> CR LF
- writeBuffer[writeBufferI++] = (byte) C_CR;
- writeBuffer[writeBufferI++] = (byte) C_LF;
- writeCR = false;
- } else {
- // Bare LF -> LF
- writeBuffer[writeBufferI++] = ch;
- }
- } else if (ch == TELNET_IAC) {
- if (writeCR == true) {
- // CR <anything> -> CR NULL
- writeBuffer[writeBufferI++] = (byte) C_CR;
- writeBuffer[writeBufferI++] = (byte) C_NUL;
- writeCR = false;
- }
- // IAC -> IAC IAC
- writeBuffer[writeBufferI++] = (byte) TELNET_IAC;
- writeBuffer[writeBufferI++] = (byte) TELNET_IAC;
- } else {
- if (writeCR == true) {
- // CR <anything> -> CR NULL
- writeBuffer[writeBufferI++] = (byte) C_CR;
- writeBuffer[writeBufferI++] = (byte) C_NUL;
- 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.
- output.write(writeBuffer, 0, writeBufferI);
- }
- }
-
-}
git://git.nikiroo.be / fanfix.git / blobdiff