test/hotspot/jtreg/vmTestbase/nsk/share/FileUtils.java

/*
 * Copyright (c) 2007, 2018, 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.
 *
 * 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.
 */

package nsk.share;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.FileInputStream;

public class FileUtils {
        private FileUtils() {
        }

        /**
         * Read whole file.
         *
         * @param file file
         * @return contents of file as byte array
         */
        public static byte[] readFile(File file) throws IOException {
                InputStream in = new FileInputStream(file);
                long countl = file.length();
                if (countl > Integer.MAX_VALUE)
                        throw new IOException("File is too huge");
                int count = (int) countl;
                byte[] buffer = new byte[count];
                int n = 0;
                try {
                        while (n < count) {
                                int k = in.read(buffer, n, count - n);
                                if (k < 0)
                                        throw new IOException("Unexpected EOF");
                                n += k;
                        }
                } finally {
                        in.close();
                }
                return buffer;
        }

        /**
         * Read whole file.
         *
         * @param name file name
         * @return contents of file as byte array
         */
        public static byte[] readFile(String name) throws IOException {
                return readFile(new File(name));
        }
}