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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 | +} | |