1 /*

     2  * Copyright 1996-2007 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 

    27 package sun.security.ssl;

    28 

    29 import java.io.OutputStream;

    30 import java.io.IOException;

    31 

    32 /*

    33  * Output stream for application data. This is the kind of stream

    34  * that's handed out via SSLSocket.getOutputStream(). It's all the application

    35  * ever sees.

    36  *

    37  * Once the initial handshake has completed, application data may be

    38  * interleaved with handshake data. That is handled internally and remains

    39  * transparent to the application.

    40  *

    41  * @author  David Brownell

    42  */

    43 class AppOutputStream extends OutputStream {

    44 

    45     private SSLSocketImpl c;

    46     OutputRecord r;

    47 

    48     // One element array used to implement the write(byte) method

    49     private final byte[] oneByte = new byte[1];

    50 

    51     AppOutputStream(SSLSocketImpl conn) {

    52         r = new OutputRecord(Record.ct_application_data);

    53         c = conn;

    54     }

    55 

    56     /**

    57      * Write the data out, NOW.

    58      */

    59     synchronized public void write(byte b[], int off, int len)

    60             throws IOException {

    61         // check if the Socket is invalid (error or closed)

    62         c.checkWrite();

    63         //

    64         // Always flush at the end of each application level record.

    65         // This lets application synchronize read and write streams

    66         // however they like; if we buffered here, they couldn't.

    67         //

    68         // NOTE: *must* call c.writeRecord() even for len == 0

    69         try {

    70             do {

    71                 int howmuch = Math.min(len, r.availableDataBytes());

    72 

    73                 if (howmuch > 0) {

    74                     r.write(b, off, howmuch);

    75                     off += howmuch;

    76                     len -= howmuch;

    77                 }

    78                 c.writeRecord(r);

    79                 c.checkWrite();

    80             } while (len > 0);

    81         } catch (Exception e) {

    82             // shutdown and rethrow (wrapped) exception as appropriate

    83             c.handleException(e);

    84         }

    85     }

    86 

    87     /**

    88      * Write one byte now.

    89      */

    90     synchronized public void write(int i) throws IOException {

    91         oneByte[0] = (byte)i;

    92         write(oneByte, 0, 1);

    93     }

    94 

    95     /*

    96      * Socket close is already synchronized, no need to block here.

    97      */

    98     public void close() throws IOException {

    99         c.close();

   100     }

   101 

   102     // inherit no-op flush()

   103 }