/*
* Copyright (c) 1996, 2015, 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
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*/
package sun.security.ssl;
import java.io.InputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import javax.net.ssl.SSLProtocolException;
/**
* InputStream for application data as returned by SSLSocket.getInputStream().
*
* @author David Brownell
*/
final class AppInputStream extends InputStream {
// the buffer size for each read of network data
private static final int READ_BUFFER_SIZE = 4096;
// static dummy array we use to implement skip()
private static final byte[] SKIP_ARRAY = new byte[256];
// the related socket of the input stream
private final SSLSocketImpl socket;
// the temporary buffer used to read network
private ByteBuffer buffer;
// Is application data available in the stream?
private boolean appDataIsAvailable;
// One element array used to implement the single byte read() method
private final byte[] oneByte = new byte[1];
AppInputStream(SSLSocketImpl conn) {
this.buffer = ByteBuffer.allocate(READ_BUFFER_SIZE);
this.socket = conn;
this.appDataIsAvailable = false;
}
/**
* Return the minimum number of bytes that can be read without blocking.
*
* Currently not synchronized.
*/
@Override
public int available() throws IOException {
if ((!appDataIsAvailable) || socket.checkEOF()) {
return 0;
}
return buffer.remaining();
}
/**
* Read a single byte, returning -1 on non-fault EOF status.
*/
@Override
public synchronized int read() throws IOException {
int n = read(oneByte, 0, 1);
if (n <= 0) { // EOF
return -1;
}
return oneByte[0] & 0xFF;
}
/**
* Reads up to {@code len} bytes of data from the input stream into an
* array of bytes. An attempt is made to read as many as {@code len} bytes,
* but a smaller number may be read. The number of bytes actually read
* is returned as an integer.
*
* If the layer above needs more data, it asks for more, so we
* are responsible only for blocking to fill at most one buffer,
* and returning "-1" on non-fault EOF status.
*/
@Override
public synchronized int read(byte[] b, int off, int len)
throws IOException {
if (b == null) {
throw new NullPointerException();
} else if (off < 0 || len < 0 || len > b.length - off) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return 0;
}
if (socket.checkEOF()) {
return -1;
}
// Read the available bytes at first.
int remains = available();
if (remains > 0) {
int howmany = Math.min(remains, len);
buffer.get(b, off, howmany);
return howmany;
}
appDataIsAvailable = false;
int volume = 0;
try {
/*
* Read data if needed ... notice that the connection guarantees
* that handshake, alert, and change cipher spec data streams are
* handled as they arrive, so we never see them here.
*/
while(volume == 0) {
// Clear the buffer for a new record reading.
buffer.clear();
//
// grow the buffer if needed
//
// Read the header of a record into the buffer, and return
// the packet size.
int packetLen = socket.bytesInCompletePacket();
if (packetLen < 0) { // EOF
return -1;
}
// Is this packet bigger than SSL/TLS normally allows?
if (packetLen > SSLRecord.maxLargeRecordSize) {
throw new SSLProtocolException(
"Illegal packet size: " + packetLen);
}
if (packetLen > buffer.remaining()) {
buffer = ByteBuffer.allocate(packetLen);
}
volume = socket.readRecord(buffer);
if (volume < 0) { // EOF
return -1;
} else if (volume > 0) {
appDataIsAvailable = true;
break;
}
}
int howmany = Math.min(len, volume);
buffer.get(b, off, howmany);
return howmany;
} catch (Exception e) {
// shutdown and rethrow (wrapped) exception as appropriate
socket.handleException(e);
// dummy for compiler
return -1;
}
}
/**
* Skip n bytes. This implementation is somewhat less efficient
* than possible, but not badly so (redundant copy). We reuse
* the read() code to keep things simpler. Note that SKIP_ARRAY
* is static and may garbled by concurrent use, but we are not interested
* in the data anyway.
*/
@Override
public synchronized long skip(long n) throws IOException {
long skipped = 0;
while (n > 0) {
int len = (int)Math.min(n, SKIP_ARRAY.length);
int r = read(SKIP_ARRAY, 0, len);
if (r <= 0) {
break;
}
n -= r;
skipped += r;
}
return skipped;
}
/*
* Socket close is already synchronized, no need to block here.
*/
@Override
public void close() throws IOException {
socket.close();
}
// inherit default mark/reset behavior (throw Exceptions) from InputStream
}