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;
    }
}