/*************************************************************************
 *                                                                       *
 *  CERT-CVC: EAC 1.11 Card Verifiable Certificate Library               * 
 *                                                                       *
 *  This software is free software; you can redistribute it and/or       *
 *  modify it under the terms of the GNU Lesser General Public           *
 *  License as published by the Free Software Foundation; either         *
 *  version 2.1 of the License, or any later version.                    *
 *                                                                       *
 *  See terms of license at gnu.org.                                     *
 *                                                                       *
 *************************************************************************/
package org.ejbca.cvc.example;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Utility for reading and writing files.
 * 
 * @author Keijo Kurkinen, Swedish National Police Board
 * @version $Id: FileHelper.java 9077 2010-05-20 10:57:01Z anatom $
 */
public final class FileHelper {

    private FileHelper() {
    }

    /**
     * Loads a file
     * 
     * @param path
     * @return
     * @throws IOException
     */
    public static byte[] loadFile(final String path) throws IOException {
	return loadFile(new File(path));
    }

    /**
     * Loads a file
     * 
     * @param file
     * @return
     * @throws IOException
     */
    public static byte[] loadFile(final File file) throws IOException {
	byte[] dataBuffer = null;
	FileInputStream inStream = null;
	try {
	    // Simple file loader...
	    final int length = (int) file.length();
	    dataBuffer = new byte[length];
	    inStream = new FileInputStream(file);

	    int offset = 0;
	    int readBytes = 0;
	    boolean readMore = true;
	    while (readMore) {
		readBytes = inStream.read(dataBuffer, offset, length - offset);
		offset += readBytes;
		readMore = readBytes > 0 && offset != length;
	    }
	} finally {
	    try {
		if (inStream != null) {
		    inStream.close();
		}
	    } catch (IOException e1) {
		System.out.println("loadFile - error when closing: " + e1);
	    }
	}
	return dataBuffer;
    }

    /**
     * Writes data to a file
     * 
     * @param file
     * @param data
     * @throws IOException
     */
    public static void writeFile(final File file, final byte[] data) throws IOException {
	FileOutputStream outStream = null;
	BufferedOutputStream bout = null;
	try {
	    outStream = new FileOutputStream(file);
	    bout = new BufferedOutputStream(outStream, 1000);
	    bout.write(data);
	} finally {
	    if (bout != null) {
		bout.close();
	    }
	}
    }

}