Subversion Repositories SmartDukaan

package in.shop2020.support.utils;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

public class FileUtils {

    /**

     * Reads a file and converts its contents to a byte array.

     * 

     * @param file

     *            Name of the file to process

     * @return the contents of the file in a byte array.

     * @throws IOException

     *             if the file could not be found or read or is too big to

     *             convert to a byte array.

     */

    public static byte[] getBytesFromFile(File file) throws IOException {

        FileInputStream is = new FileInputStream(file);

        // Get the size of the file

        long length = file.length();

        // You cannot create an array using a long type.

        // It needs to be an int type.

        // Before converting to an int type, check

        // to ensure that file is not larger than Integer.MAX_VALUE.

        if (length > Integer.MAX_VALUE) {

            // File is too large

            throw new IOException(file.getName() + " is too large to stream");

        }

        // Create the byte array to hold the data

        byte[] bytes = new byte[(int)length];

        // Read in the bytes

        int offset = 0;

        int numRead = 0;

        while (offset < bytes.length

               && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {

            offset += numRead;

        }

        // Ensure all the bytes have been read in

        if (offset < bytes.length) {

            throw new IOException("Could not completely read file "+file.getName());

        }

        // Close the input stream and return bytes

        is.close();

        return bytes;

    }

}