0N/A/*
3261N/A * Copyright (c) 1995, 2010, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
0N/A */
0N/A
0N/Apackage java.net;
0N/A
0N/Aimport java.io.FileDescriptor;
0N/Aimport java.io.FileInputStream;
0N/Aimport java.io.IOException;
0N/Aimport java.nio.channels.FileChannel;
0N/A
5503N/Aimport sun.misc.IoTrace;
0N/Aimport sun.net.ConnectionResetException;
0N/A
0N/A/**
0N/A * This stream extends FileInputStream to implement a
0N/A * SocketInputStream. Note that this class should <b>NOT</b> be
0N/A * public.
0N/A *
0N/A * @author Jonathan Payne
0N/A * @author Arthur van Hoff
0N/A */
0N/Aclass SocketInputStream extends FileInputStream
0N/A{
0N/A static {
0N/A init();
0N/A }
0N/A
0N/A private boolean eof;
0N/A private AbstractPlainSocketImpl impl = null;
0N/A private byte temp[];
0N/A private Socket socket = null;
0N/A
0N/A /**
0N/A * Creates a new SocketInputStream. Can only be called
0N/A * by a Socket. This method needs to hang on to the owner Socket so
0N/A * that the fd will not be closed.
0N/A * @param impl the implemented socket input stream
0N/A */
0N/A SocketInputStream(AbstractPlainSocketImpl impl) throws IOException {
0N/A super(impl.getFileDescriptor());
0N/A this.impl = impl;
0N/A socket = impl.getSocket();
0N/A }
0N/A
0N/A /**
0N/A * Returns the unique {@link java.nio.channels.FileChannel FileChannel}
0N/A * object associated with this file input stream.</p>
0N/A *
0N/A * The <code>getChannel</code> method of <code>SocketInputStream</code>
0N/A * returns <code>null</code> since it is a socket based stream.</p>
0N/A *
0N/A * @return the file channel associated with this file input stream
0N/A *
0N/A * @since 1.4
0N/A * @spec JSR-51
0N/A */
0N/A public final FileChannel getChannel() {
0N/A return null;
0N/A }
0N/A
0N/A /**
0N/A * Reads into an array of bytes at the specified offset using
0N/A * the received socket primitive.
0N/A * @param fd the FileDescriptor
0N/A * @param b the buffer into which the data is read
0N/A * @param off the start offset of the data
0N/A * @param len the maximum number of bytes read
0N/A * @param timeout the read timeout in ms
0N/A * @return the actual number of bytes read, -1 is
0N/A * returned when the end of the stream is reached.
0N/A * @exception IOException If an I/O error has occurred.
0N/A */
0N/A private native int socketRead0(FileDescriptor fd,
0N/A byte b[], int off, int len,
0N/A int timeout)
0N/A throws IOException;
0N/A
0N/A /**
0N/A * Reads into a byte array data from the socket.
0N/A * @param b the buffer into which the data is read
0N/A * @return the actual number of bytes read, -1 is
0N/A * returned when the end of the stream is reached.
0N/A * @exception IOException If an I/O error has occurred.
0N/A */
0N/A public int read(byte b[]) throws IOException {
0N/A return read(b, 0, b.length);
0N/A }
0N/A
0N/A /**
0N/A * Reads into a byte array <i>b</i> at offset <i>off</i>,
0N/A * <i>length</i> bytes of data.
0N/A * @param b the buffer into which the data is read
0N/A * @param off the start offset of the data
0N/A * @param len the maximum number of bytes read
0N/A * @return the actual number of bytes read, -1 is
0N/A * returned when the end of the stream is reached.
0N/A * @exception IOException If an I/O error has occurred.
0N/A */
0N/A public int read(byte b[], int off, int length) throws IOException {
2226N/A return read(b, off, length, impl.getTimeout());
2226N/A }
2226N/A
2226N/A int read(byte b[], int off, int length, int timeout) throws IOException {
5503N/A int n = 0;
0N/A
0N/A // EOF already encountered
0N/A if (eof) {
0N/A return -1;
0N/A }
0N/A
0N/A // connection reset
0N/A if (impl.isConnectionReset()) {
0N/A throw new SocketException("Connection reset");
0N/A }
0N/A
0N/A // bounds check
0N/A if (length <= 0 || off < 0 || off + length > b.length) {
0N/A if (length == 0) {
0N/A return 0;
0N/A }
0N/A throw new ArrayIndexOutOfBoundsException();
0N/A }
0N/A
0N/A boolean gotReset = false;
0N/A
5766N/A Object traceContext = IoTrace.socketReadBegin();
0N/A // acquire file descriptor and do the read
0N/A FileDescriptor fd = impl.acquireFD();
0N/A try {
2226N/A n = socketRead0(fd, b, off, length, timeout);
0N/A if (n > 0) {
0N/A return n;
0N/A }
0N/A } catch (ConnectionResetException rstExc) {
0N/A gotReset = true;
0N/A } finally {
0N/A impl.releaseFD();
5766N/A IoTrace.socketReadEnd(traceContext, impl.address, impl.port,
5766N/A timeout, n > 0 ? n : 0);
0N/A }
0N/A
0N/A /*
0N/A * We receive a "connection reset" but there may be bytes still
0N/A * buffered on the socket
0N/A */
0N/A if (gotReset) {
5766N/A traceContext = IoTrace.socketReadBegin();
0N/A impl.setConnectionResetPending();
0N/A impl.acquireFD();
0N/A try {
2226N/A n = socketRead0(fd, b, off, length, timeout);
0N/A if (n > 0) {
0N/A return n;
0N/A }
0N/A } catch (ConnectionResetException rstExc) {
0N/A } finally {
0N/A impl.releaseFD();
5766N/A IoTrace.socketReadEnd(traceContext, impl.address, impl.port,
5766N/A timeout, n > 0 ? n : 0);
0N/A }
0N/A }
0N/A
0N/A /*
0N/A * If we get here we are at EOF, the socket has been closed,
0N/A * or the connection has been reset.
0N/A */
0N/A if (impl.isClosedOrPending()) {
0N/A throw new SocketException("Socket closed");
0N/A }
0N/A if (impl.isConnectionResetPending()) {
0N/A impl.setConnectionReset();
0N/A }
0N/A if (impl.isConnectionReset()) {
0N/A throw new SocketException("Connection reset");
0N/A }
0N/A eof = true;
0N/A return -1;
0N/A }
0N/A
0N/A /**
0N/A * Reads a single byte from the socket.
0N/A */
0N/A public int read() throws IOException {
0N/A if (eof) {
0N/A return -1;
0N/A }
0N/A temp = new byte[1];
0N/A int n = read(temp, 0, 1);
0N/A if (n <= 0) {
0N/A return -1;
0N/A }
0N/A return temp[0] & 0xff;
0N/A }
0N/A
0N/A /**
0N/A * Skips n bytes of input.
0N/A * @param n the number of bytes to skip
0N/A * @return the actual number of bytes skipped.
0N/A * @exception IOException If an I/O error has occurred.
0N/A */
0N/A public long skip(long numbytes) throws IOException {
0N/A if (numbytes <= 0) {
0N/A return 0;
0N/A }
0N/A long n = numbytes;
0N/A int buflen = (int) Math.min(1024, n);
0N/A byte data[] = new byte[buflen];
0N/A while (n > 0) {
0N/A int r = read(data, 0, (int) Math.min((long) buflen, n));
0N/A if (r < 0) {
0N/A break;
0N/A }
0N/A n -= r;
0N/A }
0N/A return numbytes - n;
0N/A }
0N/A
0N/A /**
0N/A * Returns the number of bytes that can be read without blocking.
0N/A * @return the number of immediately available bytes
0N/A */
0N/A public int available() throws IOException {
0N/A return impl.available();
0N/A }
0N/A
0N/A /**
0N/A * Closes the stream.
0N/A */
0N/A private boolean closing = false;
0N/A public void close() throws IOException {
0N/A // Prevent recursion. See BugId 4484411
0N/A if (closing)
0N/A return;
0N/A closing = true;
0N/A if (socket != null) {
0N/A if (!socket.isClosed())
0N/A socket.close();
0N/A } else
0N/A impl.close();
0N/A closing = false;
0N/A }
0N/A
0N/A void setEOF(boolean eof) {
0N/A this.eof = eof;
0N/A }
0N/A
0N/A /**
0N/A * Overrides finalize, the fd is closed by the Socket.
0N/A */
0N/A protected void finalize() {}
0N/A
0N/A /**
0N/A * Perform class load-time initializations.
0N/A */
0N/A private native static void init();
0N/A}