Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * The MIT License
 *
 * Copyright (c) 2016 Andreas Schattney
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;

public class Main {
    static boolean isJPEG(byte[] data) throws IOException {
        return internalIsJPEG(new DataInputStream(new ByteArrayInputStream(data)));
    }

    static boolean isJPEG(File file) throws IOException {
        return internalIsJPEG(new DataInputStream(new BufferedInputStream(new FileInputStream(file))));
    }

    private static boolean internalIsJPEG(DataInputStream in) throws IOException {
        boolean result = false;
        try {
            int headerBytes = in.readInt();
            result = (headerBytes == 0xffd8ffe0);
        } finally {
            in.close();
        }
        return result;
    }
}