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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 | } | ||