Showing the changes to java/pkg/sun/misc/IOUtils.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 2009, 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 | +/** | |
| 27 | + * IOUtils: A collection of IO-related public static methods. | |
| 28 | + */ | |
| 29 | + | |
| 30 | +package sun.misc; | |
| 31 | + | |
| 32 | +import java.io.EOFException; | |
| 33 | +import java.io.IOException; | |
| 34 | +import java.io.InputStream; | |
| 35 | +import java.util.Arrays; | |
| 36 | + | |
| 37 | +public class IOUtils { | |
| 38 | + | |
| 39 | + /** | |
| 40 | + * Read up to <code>length</code> of bytes from <code>in</code> | |
| 41 | + * until EOF is detected. | |
| 42 | + * @param in input stream, must not be null | |
| 43 | + * @param length number of bytes to read, -1 or Integer.MAX_VALUE means | |
| 44 | + * read as much as possible | |
| 45 | + * @param readAll if true, an EOFException will be thrown if not enough | |
| 46 | + * bytes are read. Ignored when length is -1 or Integer.MAX_VALUE | |
| 47 | + * @return bytes read | |
| 48 | + * @throws IOException Any IO error or a premature EOF is detected | |
| 49 | + */ | |
| 50 | + public static byte[] readFully(InputStream is, int length, boolean readAll) | |
| 51 | + throws IOException { | |
| 52 | + byte[] output = {}; | |
| 53 | + if (length == -1) length = Integer.MAX_VALUE; | |
| 54 | + int pos = 0; | |
| 55 | + while (pos < length) { | |
| 56 | + int bytesToRead; | |
| 57 | + if (pos >= output.length) { // Only expand when there's no room | |
| 58 | + bytesToRead = Math.min(length - pos, output.length + 1024); | |
| 59 | + if (output.length < pos + bytesToRead) { | |
| 60 | + output = Arrays.copyOf(output, pos + bytesToRead); | |
| 61 | + } | |
| 62 | + } else { | |
| 63 | + bytesToRead = output.length - pos; | |
| 64 | + } | |
| 65 | + int cc = is.read(output, pos, bytesToRead); | |
| 66 | + if (cc < 0) { | |
| 67 | + if (readAll && length != Integer.MAX_VALUE) { | |
| 68 | + throw new EOFException("Detect premature EOF"); | |
| 69 | + } else { | |
| 70 | + if (output.length != pos) { | |
| 71 | + output = Arrays.copyOf(output, pos); | |
| 72 | + } | |
| 73 | + break; | |
| 74 | + } | |
| 75 | + } | |
| 76 | + pos += cc; | |
| 77 | + } | |
| 78 | + return output; | |
| 79 | + } | |
| 80 | +} | |