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 | +} | |