+ 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);
+ }