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 */ readFully(InputStream is, int length, boolean readAll)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 } 81