    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.io;
    019
    020import java.io.IOException;
    021import java.io.RandomAccessFile;
    022
    023/**
    024 * Works on RandomAccessFile.
    025 *
    026 * @since 2.13.0
    027 */
    028public class RandomAccessFiles {
    029
    030    /**
    031     * Reads a byte array starting at "position" for "length" bytes.
    032     *
    033     * @param input    The source RandomAccessFile.
    034     * @param position The offset position, measured in bytes from the beginning of the file, at which to set the file pointer.
    035     * @param length   How many bytes to read.
    036     * @return a new byte array.
    037     * @throws IOException If the first byte cannot be read for any reason other than end of file, or if the random access file has been closed, or if some
    038     *                     other I/O error occurs.
    039     */
    040    public static byte[] read(final RandomAccessFile input, final long position, final int length) throws IOException {
    041        input.seek(position);
    042        return IOUtils.toByteArray(input::read, length);
    043    }
    044
    045}