282 lines
8.9 KiB
Java
282 lines
8.9 KiB
Java
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/*
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* Copyright (C) 2014 The Android Open Source Project
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* Copyright (c) 1995, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.net;
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import java.io.FileDescriptor;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.nio.channels.FileChannel;
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import dalvik.system.BlockGuard;
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import sun.net.ConnectionResetException;
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/**
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* This stream extends FileInputStream to implement a
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* SocketInputStream. Note that this class should <b>NOT</b> be
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* public.
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*
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* @author Jonathan Payne
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* @author Arthur van Hoff
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*/
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class SocketInputStream extends FileInputStream {
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// Android-removed: Android doesn't need to call native init.
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// static {
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// init();
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//}
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private boolean eof;
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private AbstractPlainSocketImpl impl = null;
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private byte temp[];
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private Socket socket = null;
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/**
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* Creates a new SocketInputStream. Can only be called
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* by a Socket. This method needs to hang on to the owner Socket so
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* that the fd will not be closed.
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* @param impl the implemented socket input stream
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*/
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SocketInputStream(AbstractPlainSocketImpl impl) throws IOException {
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super(impl.getFileDescriptor());
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this.impl = impl;
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socket = impl.getSocket();
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}
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/**
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* Returns the unique {@link java.nio.channels.FileChannel FileChannel}
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* object associated with this file input stream.</p>
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*
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* The {@code getChannel} method of {@code SocketInputStream}
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* returns {@code null} since it is a socket based stream.</p>
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*
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* @return the file channel associated with this file input stream
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*
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* @since 1.4
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* @spec JSR-51
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*/
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public final FileChannel getChannel() {
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return null;
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}
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/**
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* Reads into an array of bytes at the specified offset using
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* the received socket primitive.
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* @param fd the FileDescriptor
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* @param b the buffer into which the data is read
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* @param off the start offset of the data
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* @param len the maximum number of bytes read
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* @param timeout the read timeout in ms
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* @return the actual number of bytes read, -1 is
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* returned when the end of the stream is reached.
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* @exception IOException If an I/O error has occurred.
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*/
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private native int socketRead0(FileDescriptor fd,
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byte b[], int off, int len,
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int timeout)
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throws IOException;
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// wrap native call to allow instrumentation
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/**
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* Reads into an array of bytes at the specified offset using
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* the received socket primitive.
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* @param fd the FileDescriptor
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* @param b the buffer into which the data is read
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* @param off the start offset of the data
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* @param len the maximum number of bytes read
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* @param timeout the read timeout in ms
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* @return the actual number of bytes read, -1 is
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* returned when the end of the stream is reached.
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* @exception IOException If an I/O error has occurred.
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*/
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private int socketRead(FileDescriptor fd,
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byte b[], int off, int len,
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int timeout)
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throws IOException {
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return socketRead0(fd, b, off, len, timeout);
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}
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/**
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* Reads into a byte array data from the socket.
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* @param b the buffer into which the data is read
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* @return the actual number of bytes read, -1 is
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* returned when the end of the stream is reached.
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* @exception IOException If an I/O error has occurred.
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*/
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public int read(byte b[]) throws IOException {
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return read(b, 0, b.length);
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}
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/**
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* Reads into a byte array <i>b</i> at offset <i>off</i>,
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* <i>length</i> bytes of data.
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* @param b the buffer into which the data is read
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* @param off the start offset of the data
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* @param length the maximum number of bytes read
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* @return the actual number of bytes read, -1 is
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* returned when the end of the stream is reached.
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* @exception IOException If an I/O error has occurred.
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*/
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public int read(byte b[], int off, int length) throws IOException {
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return read(b, off, length, impl.getTimeout());
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}
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int read(byte b[], int off, int length, int timeout) throws IOException {
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int n;
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// EOF already encountered
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if (eof) {
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return -1;
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}
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// connection reset
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if (impl.isConnectionReset()) {
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throw new SocketException("Connection reset");
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}
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// bounds check
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if (length <= 0 || off < 0 || length > b.length - off) {
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if (length == 0) {
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return 0;
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}
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throw new ArrayIndexOutOfBoundsException("length == " + length
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+ " off == " + off + " buffer length == " + b.length);
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}
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// acquire file descriptor and do the read
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FileDescriptor fd = impl.acquireFD();
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try {
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// Android-added: Check BlockGuard policy in read().
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BlockGuard.getThreadPolicy().onNetwork();
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n = socketRead(fd, b, off, length, timeout);
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if (n > 0) {
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return n;
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}
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} catch (ConnectionResetException rstExc) {
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impl.setConnectionReset();
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} finally {
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impl.releaseFD();
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}
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/*
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* If we get here we are at EOF, the socket has been closed,
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* or the connection has been reset.
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*/
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if (impl.isClosedOrPending()) {
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throw new SocketException("Socket closed");
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}
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if (impl.isConnectionReset()) {
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throw new SocketException("Connection reset");
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}
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eof = true;
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return -1;
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}
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/**
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* Reads a single byte from the socket.
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*/
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public int read() throws IOException {
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if (eof) {
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return -1;
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}
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temp = new byte[1];
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int n = read(temp, 0, 1);
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if (n <= 0) {
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return -1;
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}
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return temp[0] & 0xff;
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}
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/**
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* Skips n bytes of input.
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* @param numbytes the number of bytes to skip
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* @return the actual number of bytes skipped.
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* @exception IOException If an I/O error has occurred.
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*/
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public long skip(long numbytes) throws IOException {
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if (numbytes <= 0) {
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return 0;
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}
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long n = numbytes;
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int buflen = (int) Math.min(1024, n);
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byte data[] = new byte[buflen];
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while (n > 0) {
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int r = read(data, 0, (int) Math.min((long) buflen, n));
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if (r < 0) {
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break;
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}
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n -= r;
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}
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return numbytes - n;
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}
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/**
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* Returns the number of bytes that can be read without blocking.
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* @return the number of immediately available bytes
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*/
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public int available() throws IOException {
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// Android-changed: Bug fix, if eof == true, we must indicate that we
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// have 0 bytes available.
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if (eof) {
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return 0;
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} else {
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return impl.available();
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}
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}
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/**
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* Closes the stream.
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*/
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private boolean closing = false;
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public void close() throws IOException {
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// Prevent recursion. See BugId 4484411
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if (closing)
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return;
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closing = true;
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if (socket != null) {
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if (!socket.isClosed())
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socket.close();
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} else
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impl.close();
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closing = false;
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}
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void setEOF(boolean eof) {
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this.eof = eof;
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}
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/**
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* Overrides finalize, the fd is closed by the Socket.
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*/
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protected void finalize() {}
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// Android-removed: Android doesn't need native init.
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/*
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* Perform class load-time initializations.
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*
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private native static void init();
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*/
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}
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