| /* |
| * Copyright (c) 2009, 2017 Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * IOUtils: A collection of IO-related public static methods. |
| */ |
| |
| package sun.security.util; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Arrays; |
| |
| public class IOUtils { |
| |
| /** |
| * Read up to <code>length</code> of bytes from <code>in</code> |
| * until EOF is detected. |
| * @param is input stream, must not be null |
| * @param length number of bytes to read |
| * @param readAll if true, an EOFException will be thrown if not enough |
| * bytes are read. |
| * @return bytes read |
| * @throws IOException Any IO error or a premature EOF is detected |
| */ |
| public static byte[] readFully(InputStream is, int length, boolean readAll) |
| throws IOException { |
| if (length < 0) { |
| throw new IOException("Invalid length"); |
| } |
| byte[] output = {}; |
| int pos = 0; |
| while (pos < length) { |
| int bytesToRead; |
| if (pos >= output.length) { // Only expand when there's no room |
| bytesToRead = Math.min(length - pos, output.length + 1024); |
| if (output.length < pos + bytesToRead) { |
| output = Arrays.copyOf(output, pos + bytesToRead); |
| } |
| } else { |
| bytesToRead = output.length - pos; |
| } |
| int cc = is.read(output, pos, bytesToRead); |
| if (cc < 0) { |
| if (readAll) { |
| throw new EOFException("Detect premature EOF"); |
| } else { |
| if (output.length != pos) { |
| output = Arrays.copyOf(output, pos); |
| } |
| break; |
| } |
| } |
| pos += cc; |
| } |
| return output; |
| } |
| } |