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| 1 | /* | ||
| 2 | * Copyright (c) 1995, 2010, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.net; | ||
| 27 | |||
| 28 | import java.io.FileDescriptor; | ||
| 29 | import java.io.FileInputStream; | ||
| 30 | import java.io.IOException; | ||
| 31 | import java.nio.channels.FileChannel; | ||
| 32 | |||
| 33 | import sun.net.ConnectionResetException; | ||
| 34 | |||
| 35 | /** | ||
| 36 | * This stream extends FileInputStream to implement a | ||
| 37 | * SocketInputStream. Note that this class should <b>NOT</b> be | ||
| 38 | * public. | ||
| 39 | * | ||
| 40 | * @author Jonathan Payne | ||
| 41 | * @author Arthur van Hoff | ||
| 42 | */ | ||
| 43 | class SocketInputStream extends FileInputStream | ||
| 44 | { | ||
| 45 | static { | ||
| 46 | init(); | ||
| 47 | } | ||
| 48 | |||
| 49 | private boolean eof; | ||
| 50 | private AbstractPlainSocketImpl impl = null; | ||
| 51 | private byte temp[]; | ||
| 52 | private Socket socket = null; | ||
| 53 | |||
| 54 | /** | ||
| 55 | * Creates a new SocketInputStream. Can only be called | ||
| 56 | * by a Socket. This method needs to hang on to the owner Socket so | ||
| 57 | * that the fd will not be closed. | ||
| 58 | * @param impl the implemented socket input stream | ||
| 59 | */ | ||
| 60 | SocketInputStream(AbstractPlainSocketImpl impl) throws IOException { | ||
| 61 | super(impl.getFileDescriptor()); | ||
| 62 | this.impl = impl; | ||
| 63 | socket = impl.getSocket(); | ||
| 64 | } | ||
| 65 | |||
| 66 | /** | ||
| 67 | * Returns the unique {@link java.nio.channels.FileChannel FileChannel} | ||
| 68 | * object associated with this file input stream.</p> | ||
| 69 | * | ||
| 70 | * The <code>getChannel</code> method of <code>SocketInputStream</code> | ||
| 71 | * returns <code>null</code> since it is a socket based stream.</p> | ||
| 72 | * | ||
| 73 | * @return the file channel associated with this file input stream | ||
| 74 | * | ||
| 75 | * @since 1.4 | ||
| 76 | * @spec JSR-51 | ||
| 77 | */ | ||
| 78 | public final FileChannel getChannel() { | ||
| 79 | return null; | ||
| 80 | } | ||
| 81 | |||
| 82 | /** | ||
| 83 | * Reads into an array of bytes at the specified offset using | ||
| 84 | * the received socket primitive. | ||
| 85 | * @param fd the FileDescriptor | ||
| 86 | * @param b the buffer into which the data is read | ||
| 87 | * @param off the start offset of the data | ||
| 88 | * @param len the maximum number of bytes read | ||
| 89 | * @param timeout the read timeout in ms | ||
| 90 | * @return the actual number of bytes read, -1 is | ||
| 91 | * returned when the end of the stream is reached. | ||
| 92 | * @exception IOException If an I/O error has occurred. | ||
| 93 | */ | ||
| 94 | private native int socketRead0(FileDescriptor fd, | ||
| 95 | byte b[], int off, int len, | ||
| 96 | int timeout) | ||
| 97 | throws IOException; | ||
| 98 | |||
| 99 | /** | ||
| 100 | * Reads into a byte array data from the socket. | ||
| 101 | * @param b the buffer into which the data is read | ||
| 102 | * @return the actual number of bytes read, -1 is | ||
| 103 | * returned when the end of the stream is reached. | ||
| 104 | * @exception IOException If an I/O error has occurred. | ||
| 105 | */ | ||
| 106 | public int read(byte b[]) throws IOException { | ||
| 107 | return read(b, 0, b.length); | ||
| 108 | } | ||
| 109 | |||
| 110 | /** | ||
| 111 | * Reads into a byte array <i>b</i> at offset <i>off</i>, | ||
| 112 | * <i>length</i> bytes of data. | ||
| 113 | * @param b the buffer into which the data is read | ||
| 114 | * @param off the start offset of the data | ||
| 115 | * @param len the maximum number of bytes read | ||
| 116 | * @return the actual number of bytes read, -1 is | ||
| 117 | * returned when the end of the stream is reached. | ||
| 118 | * @exception IOException If an I/O error has occurred. | ||
| 119 | */ | ||
| 120 | public int read(byte b[], int off, int length) throws IOException { | ||
| 121 | return read(b, off, length, impl.getTimeout()); | ||
| 122 | } | ||
| 123 | |||
| 124 | int read(byte b[], int off, int length, int timeout) throws IOException { | ||
| 125 | int n; | ||
| 126 | |||
| 127 | // EOF already encountered | ||
| 128 | if (eof) { | ||
| 129 | return -1; | ||
| 130 | } | ||
| 131 | |||
| 132 | // connection reset | ||
| 133 | if (impl.isConnectionReset()) { | ||
| 134 | throw new SocketException("Connection reset"); | ||
| 135 | } | ||
| 136 | |||
| 137 | // bounds check | ||
| 138 | if (length <= 0 || off < 0 || off + length > b.length) { | ||
| 139 | if (length == 0) { | ||
| 140 | return 0; | ||
| 141 | } | ||
| 142 | throw new ArrayIndexOutOfBoundsException(); | ||
| 143 | } | ||
| 144 | |||
| 145 | boolean gotReset = false; | ||
| 146 | |||
| 147 | // acquire file descriptor and do the read | ||
| 148 | FileDescriptor fd = impl.acquireFD(); | ||
| 149 | try { | ||
| 150 | n = socketRead0(fd, b, off, length, timeout); | ||
| 151 | if (n > 0) { | ||
| 152 | return n; | ||
| 153 | } | ||
| 154 | } catch (ConnectionResetException rstExc) { | ||
| 155 | gotReset = true; | ||
| 156 | } finally { | ||
| 157 | impl.releaseFD(); | ||
| 158 | } | ||
| 159 | |||
| 160 | /* | ||
| 161 | * We receive a "connection reset" but there may be bytes still | ||
| 162 | * buffered on the socket | ||
| 163 | */ | ||
| 164 | if (gotReset) { | ||
| 165 | impl.setConnectionResetPending(); | ||
| 166 | impl.acquireFD(); | ||
| 167 | try { | ||
| 168 | n = socketRead0(fd, b, off, length, timeout); | ||
| 169 | if (n > 0) { | ||
| 170 | return n; | ||
| 171 | } | ||
| 172 | } catch (ConnectionResetException rstExc) { | ||
| 173 | } finally { | ||
| 174 | impl.releaseFD(); | ||
| 175 | } | ||
| 176 | } | ||
| 177 | |||
| 178 | /* | ||
| 179 | * If we get here we are at EOF, the socket has been closed, | ||
| 180 | * or the connection has been reset. | ||
| 181 | */ | ||
| 182 | if (impl.isClosedOrPending()) { | ||
| 183 | throw new SocketException("Socket closed"); | ||
| 184 | } | ||
| 185 | if (impl.isConnectionResetPending()) { | ||
| 186 | impl.setConnectionReset(); | ||
| 187 | } | ||
| 188 | if (impl.isConnectionReset()) { | ||
| 189 | throw new SocketException("Connection reset"); | ||
| 190 | } | ||
| 191 | eof = true; | ||
| 192 | return -1; | ||
| 193 | } | ||
| 194 | |||
| 195 | /** | ||
| 196 | * Reads a single byte from the socket. | ||
| 197 | */ | ||
| 198 | public int read() throws IOException { | ||
| 199 | if (eof) { | ||
| 200 | return -1; | ||
| 201 | } | ||
| 202 | temp = new byte[1]; | ||
| 203 | int n = read(temp, 0, 1); | ||
| 204 | if (n <= 0) { | ||
| 205 | return -1; | ||
| 206 | } | ||
| 207 | return temp[0] & 0xff; | ||
| 208 | } | ||
| 209 | |||
| 210 | /** | ||
| 211 | * Skips n bytes of input. | ||
| 212 | * @param n the number of bytes to skip | ||
| 213 | * @return the actual number of bytes skipped. | ||
| 214 | * @exception IOException If an I/O error has occurred. | ||
| 215 | */ | ||
| 216 | public long skip(long numbytes) throws IOException { | ||
| 217 | if (numbytes <= 0) { | ||
| 218 | return 0; | ||
| 219 | } | ||
| 220 | long n = numbytes; | ||
| 221 | int buflen = (int) Math.min(1024, n); | ||
| 222 | byte data[] = new byte[buflen]; | ||
| 223 | while (n > 0) { | ||
| 224 | int r = read(data, 0, (int) Math.min((long) buflen, n)); | ||
| 225 | if (r < 0) { | ||
| 226 | break; | ||
| 227 | } | ||
| 228 | n -= r; | ||
| 229 | } | ||
| 230 | return numbytes - n; | ||
| 231 | } | ||
| 232 | |||
| 233 | /** | ||
| 234 | * Returns the number of bytes that can be read without blocking. | ||
| 235 | * @return the number of immediately available bytes | ||
| 236 | */ | ||
| 237 | public int available() throws IOException { | ||
| 238 | return impl.available(); | ||
| 239 | } | ||
| 240 | |||
| 241 | /** | ||
| 242 | * Closes the stream. | ||
| 243 | */ | ||
| 244 | private boolean closing = false; | ||
| 245 | public void close() throws IOException { | ||
| 246 | // Prevent recursion. See BugId 4484411 | ||
| 247 | if (closing) | ||
| 248 | return; | ||
| 249 | closing = true; | ||
| 250 | if (socket != null) { | ||
| 251 | if (!socket.isClosed()) | ||
| 252 | socket.close(); | ||
| 253 | } else | ||
| 254 | impl.close(); | ||
| 255 | closing = false; | ||
| 256 | } | ||
| 257 | |||
| 258 | void setEOF(boolean eof) { | ||
| 259 | this.eof = eof; | ||
| 260 | } | ||
| 261 | |||
| 262 | /** | ||
| 263 | * Overrides finalize, the fd is closed by the Socket. | ||
| 264 | */ | ||
| 265 | protected void finalize() {} | ||
| 266 | |||
| 267 | /** | ||
| 268 | * Perform class load-time initializations. | ||
| 269 | */ | ||
| 270 | private native static void init(); | ||
| 271 | } | ||