Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;

public class Main {
    /**
     * Reads a "double" value from a byte array at a given offset. The value is
     * converted to the opposed endian system while reading.
     * @param data source byte array
     * @param offset starting offset in the byte array
     * @return the value read
     */
    public static double readSwappedDouble(byte[] data, int offset) {
        return Double.longBitsToDouble(readSwappedLong(data, offset));
    }

    /**
     * Reads a "double" value from an InputStream. The value is
     * converted to the opposed endian system while reading.
     * @param input source InputStream
     * @return the value just read
     * @throws IOException in case of an I/O problem
     */
    public static double readSwappedDouble(InputStream input) throws IOException {
        return Double.longBitsToDouble(readSwappedLong(input));
    }

    /**
     * Reads a "long" value from a byte array at a given offset. The value is
     * converted to the opposed endian system while reading.
     * @param data source byte array
     * @param offset starting offset in the byte array
     * @return the value read
     */
    public static long readSwappedLong(byte[] data, int offset) {
        long low = ((data[offset + 0] & 0xff) << 0) + ((data[offset + 1] & 0xff) << 8)
                + ((data[offset + 2] & 0xff) << 16) + ((data[offset + 3] & 0xff) << 24);
        long high = ((data[offset + 4] & 0xff) << 0) + ((data[offset + 5] & 0xff) << 8)
                + ((data[offset + 6] & 0xff) << 16) + ((data[offset + 7] & 0xff) << 24);
        return (high << 32) + (0xffffffffL & low);
    }

    /**
     * Reads a "long" value from an InputStream. The value is
     * converted to the opposed endian system while reading.
     * @param input source InputStream
     * @return the value just read
     * @throws IOException in case of an I/O problem
     */
    public static long readSwappedLong(InputStream input) throws IOException {
        byte[] bytes = new byte[8];
        for (int i = 0; i < 8; i++) {
            bytes[i] = (byte) read(input);
        }
        return readSwappedLong(bytes, 0);
    }

    /**
     * Reads the next byte from the input stream.
     * @param input  the stream
     * @return the byte
     * @throws IOException if the end of file is reached
     */
    private static int read(InputStream input) throws IOException {
        int value = input.read();

        if (-1 == value) {
            throw new EOFException("Unexpected EOF reached");
        }

        return value;
    }
}