001: /*
002: * @(#)Out.java 1.19 02/07/24 @(#)
003: *
004: * Copyright (c) 2000-2002 Sun Microsystems, Inc. All rights reserved.
005: * PROPRIETARY/CONFIDENTIAL
006: * Use is subject to license terms.
007: */
008:
009: package com.sun.portal.kssl;
010:
011: import java.io.OutputStream;
012: import java.io.IOException;
013: import java.io.InterruptedIOException;
014:
015: /**
016: * This class is a subclass of OutputStream and is used for
017: * writing data to an SSL connection.
018: * <P />
019: * @see com.sun.kssl.SSLStreamConnection
020: * @see com.sun.kssl.In
021: */
022: class Out extends OutputStream {
023: /**
024: * The maximum SSL record size to write, currently 2048.
025: * RFC 2246 specifies it can be up to 2^14 + 2048, however
026: * breaking up streams into smaller chunks make more sense, lower
027: * memory usage for small devices and interspacing encryption and
028: * network writes may work better on congested wireless networks.
029: */
030: private static final int MAX_RECORD_SIZE = 2048;
031:
032: /** Underlying SSL record layer to which bytes are written. */
033: private Record rec;
034: /** Handle to current SSL stream connection. */
035: private SSLStreamConnection ssc;
036: /** A reusable buffer for the <code>write</code> method. */
037: private byte[] buf = new byte[1];
038:
039: /**
040: * Creates a new Out object.
041: * <P />
042: * @param r SSL record layer object to which bytes are written
043: * @param c SSLStreamConnection object this Out object is a part of
044: */
045: Out(Record r, SSLStreamConnection c) {
046: rec = r;
047: ssc = c;
048: }
049:
050: /**
051: * Writes the specified byte to this output stream.
052: * <P />
053: * @param b byte to be written
054: * @exception IOException if I/O error occurs
055: */
056: public void write(int b) throws IOException {
057: buf[0] = (byte) b;
058: write(buf, 0, 1);
059: }
060:
061: /**
062: * Writes all the bytes in the specified byte array to this
063: * output stream. This is equivalent to write(b, 0, b.length).
064: * <P />
065: * @param b byte array containing data to be written
066: * @exception IOException if I/O error occurs
067: */
068: public void write(byte[] b) throws IOException {
069: write(b, 0, b.length);
070: }
071:
072: /**
073: * Writes <CODE>len</CODE> bytes starting at offset
074: * <CODE>off</CODE> from byte array <CODE>b</CODE> to this
075: * output stream.
076: * <P />
077: * @param b byte array containing data to be written
078: * @param off starting offset of data to be written
079: * @param len number of bytes to be written
080: * @exception IOException if I/O error occurs
081: */
082: public void write(byte[] b, int off, int len) throws IOException {
083:
084: int bytesToWrite = MAX_RECORD_SIZE;
085:
086: if (rec == null) {
087: throw new InterruptedIOException("Stream closed");
088: }
089:
090: while (len > 0) {
091: bytesToWrite = MAX_RECORD_SIZE;
092: if (len < bytesToWrite) {
093: bytesToWrite = len;
094: }
095: rec.wrRec(Record.APP, b, off, bytesToWrite);
096: len -= bytesToWrite;
097: off += bytesToWrite;
098: }
099: }
100:
101: /**
102: * Close the stream connection.
103: *
104: * @exception IOException is thrown, if an I/O error occurs while
105: * shutting down the connection
106: */
107: synchronized public void close() throws IOException {
108: if (ssc != null) {
109: ssc.outputStreamState = SSLStreamConnection.CLOSED;
110: ssc.cleanupIfNeeded();
111: ssc = null;
112: rec = null;
113: }
114: }
115:
116: // Other methods: flush() need not be over ridden
117: }
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