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Java example source code file (SaslOutputStream.java)

This example Java source code file (SaslOutputStream.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

cannot, close, dispose, filteroutputstream, illegalargumentexception, ioexception, numberformatexception, saslclient\'s, saslexception, sasloutputstream, string

The SaslOutputStream.java Java example source code

/*
 * Copyright (c) 2001, 2003, Oracle and/or its affiliates. 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.jndi.ldap.sasl;

import javax.security.sasl.Sasl;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslException;
import java.io.IOException;
import java.io.FilterOutputStream;
import java.io.OutputStream;

class SaslOutputStream extends FilterOutputStream {
    private static final boolean debug = false;

    private byte[] lenBuf = new byte[4];  // buffer for storing length
    private int rawSendSize = 65536;
    private SaslClient sc;

    SaslOutputStream(SaslClient sc, OutputStream out) throws SaslException {
        super(out);
        this.sc = sc;

        if (debug) {
            System.err.println("SaslOutputStream: " + out);
        }

        String str = (String) sc.getNegotiatedProperty(Sasl.RAW_SEND_SIZE);
        if (str != null) {
            try {
                rawSendSize = Integer.parseInt(str);
            } catch (NumberFormatException e) {
                throw new SaslException(Sasl.RAW_SEND_SIZE +
                    " property must be numeric string: " + str);
            }
        }
    }

    // Override this method to call write(byte[], int, int) counterpart
    // super.write(int) simply calls out.write(int)

    public void write(int b) throws IOException {
        byte[] buffer = new byte[1];
        buffer[0] = (byte)b;
        write(buffer, 0, 1);
    }

    /**
     * Override this method to "wrap" the outgoing buffer before
     * writing it to the underlying output stream.
     */
    public void write(byte[] buffer, int offset, int total) throws IOException {
        int count;
        byte[] wrappedToken, saslBuffer;

        // "Packetize" buffer to be within rawSendSize
        if (debug) {
            System.err.println("Total size: " + total);
        }

        for (int i = 0; i < total; i += rawSendSize) {

            // Calculate length of current "packet"
            count = (total - i) < rawSendSize ? (total - i) : rawSendSize;

            // Generate wrapped token
            wrappedToken = sc.wrap(buffer, offset+i, count);

            // Write out length
            intToNetworkByteOrder(wrappedToken.length, lenBuf, 0, 4);

            if (debug) {
                System.err.println("sending size: " + wrappedToken.length);
            }
            out.write(lenBuf, 0, 4);

            // Write out wrapped token
            out.write(wrappedToken, 0, wrappedToken.length);
        }
    }

    public void close() throws IOException {
        SaslException save = null;
        try {
            sc.dispose();  // Dispose of SaslClient's state
        } catch (SaslException e) {
            // Save exception for throwing after closing 'in'
            save = e;
        }
        super.close();  // Close underlying output stream

        if (save != null) {
            throw save;
        }
    }

    // Copied from com.sun.security.sasl.util.SaslImpl
    /**
     * Encodes an integer into 4 bytes in network byte order in the buffer
     * supplied.
     */
    private static void intToNetworkByteOrder(int num, byte[] buf, int start,
        int count) {
        if (count > 4) {
            throw new IllegalArgumentException("Cannot handle more than 4 bytes");
        }

        for (int i = count-1; i >= 0; i--) {
            buf[start+i] = (byte)(num & 0xff);
            num >>>= 8;
        }
    }
}

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