Showing the changes to java/pkg/sun/rmi/log/LogInputStream.java (1 of 18352 files). Show all
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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 1999, 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 sun.rmi.log; | ||
| 27 | |||
| 28 | import java.io.*; | ||
| 29 | |||
| 30 | public | ||
| 31 | class LogInputStream extends InputStream { | ||
| 32 | private InputStream in; | ||
| 33 | private int length; | ||
| 34 | |||
| 35 | /** | ||
| 36 | * Creates a log input file with the specified system dependent | ||
| 37 | * file descriptor. | ||
| 38 | * @param fd the system dependent file descriptor | ||
| 39 | * @param length the total number of bytes allowed to be read | ||
| 40 | * @exception IOException If an I/O error has occurred. | ||
| 41 | */ | ||
| 42 | public LogInputStream(InputStream in, int length) throws IOException { | ||
| 43 | this.in = in; | ||
| 44 | this.length = length; | ||
| 45 | } | ||
| 46 | |||
| 47 | /** | ||
| 48 | * Reads a byte of data. This method will block if no input is | ||
| 49 | * available. | ||
| 50 | * @return the byte read, or -1 if the end of the log or end of the | ||
| 51 | * stream is reached. | ||
| 52 | * @exception IOException If an I/O error has occurred. | ||
| 53 | */ | ||
| 54 | public int read() throws IOException { | ||
| 55 | if (length == 0) | ||
| 56 | return -1; | ||
| 57 | int c = in.read(); | ||
| 58 | length = (c != -1) ? length - 1 : 0; | ||
| 59 | return c; | ||
| 60 | } | ||
| 61 | |||
| 62 | /** | ||
| 63 | * Reads data into an array of bytes. | ||
| 64 | * This method blocks until some input is available. | ||
| 65 | * @param b the buffer into which the data is read | ||
| 66 | * @return the actual number of bytes read, or -1 if the end of the log | ||
| 67 | * or end of the stream is reached. | ||
| 68 | * @exception IOException If an I/O error has occurred. | ||
| 69 | */ | ||
| 70 | public int read(byte b[]) throws IOException { | ||
| 71 | return read(b, 0, b.length); | ||
| 72 | } | ||
| 73 | |||
| 74 | /** | ||
| 75 | * Reads data into an array of bytes. | ||
| 76 | * This method blocks until some input is available. | ||
| 77 | * @param b the buffer into which the data is read | ||
| 78 | * @param off the start offset of the data | ||
| 79 | * @param len the maximum number of bytes read | ||
| 80 | * @return the actual number of bytes read, or -1 if the end of the log or | ||
| 81 | * end of the stream is reached. | ||
| 82 | * @exception IOException If an I/O error has occurred. | ||
| 83 | */ | ||
| 84 | public int read(byte b[], int off, int len) throws IOException { | ||
| 85 | if (length == 0) | ||
| 86 | return -1; | ||
| 87 | len = (length < len) ? length : len; | ||
| 88 | int n = in.read(b, off, len); | ||
| 89 | length = (n != -1) ? length - n : 0; | ||
| 90 | return n; | ||
| 91 | } | ||
| 92 | |||
| 93 | /** | ||
| 94 | * Skips n bytes of input. | ||
| 95 | * @param n the number of bytes to be skipped | ||
| 96 | * @return the actual number of bytes skipped. | ||
| 97 | * @exception IOException If an I/O error has occurred. | ||
| 98 | */ | ||
| 99 | public long skip(long n) throws IOException { | ||
| 100 | if (n > Integer.MAX_VALUE) | ||
| 101 | throw new IOException("Too many bytes to skip - " + n); | ||
| 102 | if (length == 0) | ||
| 103 | return 0; | ||
| 104 | n = (length < n) ? length : n; | ||
| 105 | n = in.skip(n); | ||
| 106 | length -= n; | ||
| 107 | return n; | ||
| 108 | } | ||
| 109 | |||
| 110 | /** | ||
| 111 | * Returns the number of bytes that can be read without blocking. | ||
| 112 | * @return the number of available bytes, which is initially | ||
| 113 | * equal to the file size. | ||
| 114 | */ | ||
| 115 | public int available() throws IOException { | ||
| 116 | int avail = in.available(); | ||
| 117 | return (length < avail) ? length : avail; | ||
| 118 | } | ||
| 119 | |||
| 120 | /** | ||
| 121 | * Closes the input stream. No further input can be read. | ||
| 122 | * the stream. | ||
| 123 | */ | ||
| 124 | public void close() { | ||
| 125 | length = 0; | ||
| 126 | } | ||
| 127 | |||
| 128 | /** | ||
| 129 | * Closes the stream when garbage is collected. | ||
| 130 | */ | ||
| 131 | protected void finalize() throws IOException { | ||
| 132 | close(); | ||
| 133 | } | ||
| 134 | } | ||