| /* |
| * Copyright (c) 1995, 2018, 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.net; |
| |
| import java.io.FileDescriptor; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.nio.channels.FileChannel; |
| |
| import sun.net.ConnectionResetException; |
| |
| /** |
| * This stream extends FileInputStream to implement a |
| * SocketInputStream. Note that this class should <b>NOT</b> be |
| * public. |
| * |
| * @author Jonathan Payne |
| * @author Arthur van Hoff |
| */ |
| class SocketInputStream extends FileInputStream { |
| static { |
| init(); |
| } |
| |
| private boolean eof; |
| private AbstractPlainSocketImpl impl = null; |
| private byte temp[]; |
| private Socket socket = null; |
| |
| /** |
| * Creates a new SocketInputStream. Can only be called |
| * by a Socket. This method needs to hang on to the owner Socket so |
| * that the fd will not be closed. |
| * @param impl the implemented socket input stream |
| */ |
| SocketInputStream(AbstractPlainSocketImpl impl) throws IOException { |
| super(impl.getFileDescriptor()); |
| this.impl = impl; |
| socket = impl.getSocket(); |
| } |
| |
| /** |
| * Returns the unique {@link java.nio.channels.FileChannel FileChannel} |
| * object associated with this file input stream.</p> |
| * |
| * The {@code getChannel} method of {@code SocketInputStream} |
| * returns {@code null} since it is a socket based stream.</p> |
| * |
| * @return the file channel associated with this file input stream |
| * |
| * @since 1.4 |
| * @spec JSR-51 |
| */ |
| public final FileChannel getChannel() { |
| return null; |
| } |
| |
| /** |
| * Reads into an array of bytes at the specified offset using |
| * the received socket primitive. |
| * @param fd the FileDescriptor |
| * @param b the buffer into which the data is read |
| * @param off the start offset of the data |
| * @param len the maximum number of bytes read |
| * @param timeout the read timeout in ms |
| * @return the actual number of bytes read, -1 is |
| * returned when the end of the stream is reached. |
| * @exception IOException If an I/O error has occurred. |
| */ |
| private native int socketRead0(FileDescriptor fd, |
| byte b[], int off, int len, |
| int timeout) |
| throws IOException; |
| |
| // wrap native call to allow instrumentation |
| /** |
| * Reads into an array of bytes at the specified offset using |
| * the received socket primitive. |
| * @param fd the FileDescriptor |
| * @param b the buffer into which the data is read |
| * @param off the start offset of the data |
| * @param len the maximum number of bytes read |
| * @param timeout the read timeout in ms |
| * @return the actual number of bytes read, -1 is |
| * returned when the end of the stream is reached. |
| * @exception IOException If an I/O error has occurred. |
| */ |
| private int socketRead(FileDescriptor fd, |
| byte b[], int off, int len, |
| int timeout) |
| throws IOException { |
| return socketRead0(fd, b, off, len, timeout); |
| } |
| |
| /** |
| * Reads into a byte array data from the socket. |
| * @param b the buffer into which the data is read |
| * @return the actual number of bytes read, -1 is |
| * returned when the end of the stream is reached. |
| * @exception IOException If an I/O error has occurred. |
| */ |
| public int read(byte b[]) throws IOException { |
| return read(b, 0, b.length); |
| } |
| |
| /** |
| * Reads into a byte array <i>b</i> at offset <i>off</i>, |
| * <i>length</i> bytes of data. |
| * @param b the buffer into which the data is read |
| * @param off the start offset of the data |
| * @param length the maximum number of bytes read |
| * @return the actual number of bytes read, -1 is |
| * returned when the end of the stream is reached. |
| * @exception IOException If an I/O error has occurred. |
| */ |
| public int read(byte b[], int off, int length) throws IOException { |
| return read(b, off, length, impl.getTimeout()); |
| } |
| |
| int read(byte b[], int off, int length, int timeout) throws IOException { |
| int n; |
| |
| // EOF already encountered |
| if (eof) { |
| return -1; |
| } |
| |
| // connection reset |
| if (impl.isConnectionReset()) { |
| throw new SocketException("Connection reset"); |
| } |
| |
| // bounds check |
| if (length <= 0 || off < 0 || length > b.length - off) { |
| if (length == 0) { |
| return 0; |
| } |
| throw new ArrayIndexOutOfBoundsException("length == " + length |
| + " off == " + off + " buffer length == " + b.length); |
| } |
| |
| // acquire file descriptor and do the read |
| FileDescriptor fd = impl.acquireFD(); |
| try { |
| n = socketRead(fd, b, off, length, timeout); |
| if (n > 0) { |
| return n; |
| } |
| } catch (ConnectionResetException rstExc) { |
| impl.setConnectionReset(); |
| } finally { |
| impl.releaseFD(); |
| } |
| |
| /* |
| * If we get here we are at EOF, the socket has been closed, |
| * or the connection has been reset. |
| */ |
| if (impl.isClosedOrPending()) { |
| throw new SocketException("Socket closed"); |
| } |
| if (impl.isConnectionReset()) { |
| throw new SocketException("Connection reset"); |
| } |
| eof = true; |
| return -1; |
| } |
| |
| /** |
| * Reads a single byte from the socket. |
| */ |
| public int read() throws IOException { |
| if (eof) { |
| return -1; |
| } |
| temp = new byte[1]; |
| int n = read(temp, 0, 1); |
| if (n <= 0) { |
| return -1; |
| } |
| return temp[0] & 0xff; |
| } |
| |
| /** |
| * Skips n bytes of input. |
| * @param numbytes the number of bytes to skip |
| * @return the actual number of bytes skipped. |
| * @exception IOException If an I/O error has occurred. |
| */ |
| public long skip(long numbytes) throws IOException { |
| if (numbytes <= 0) { |
| return 0; |
| } |
| long n = numbytes; |
| int buflen = (int) Math.min(1024, n); |
| byte data[] = new byte[buflen]; |
| while (n > 0) { |
| int r = read(data, 0, (int) Math.min((long) buflen, n)); |
| if (r < 0) { |
| break; |
| } |
| n -= r; |
| } |
| return numbytes - n; |
| } |
| |
| /** |
| * Returns the number of bytes that can be read without blocking. |
| * @return the number of immediately available bytes |
| */ |
| public int available() throws IOException { |
| int available = impl.available(); |
| return eof ? 0 : available; |
| } |
| |
| /** |
| * Closes the stream. |
| */ |
| private boolean closing = false; |
| public void close() throws IOException { |
| // Prevent recursion. See BugId 4484411 |
| if (closing) |
| return; |
| closing = true; |
| if (socket != null) { |
| if (!socket.isClosed()) |
| socket.close(); |
| } else |
| impl.close(); |
| closing = false; |
| } |
| |
| void setEOF(boolean eof) { |
| this.eof = eof; |
| } |
| |
| /** |
| * Overrides finalize, the fd is closed by the Socket. |
| */ |
| @SuppressWarnings({"deprecation", "removal"}) |
| protected void finalize() {} |
| |
| /** |
| * Perform class load-time initializations. |
| */ |
| private static native void init(); |
| } |