LimitedInputStream , this reads chunks of data from a file rather than a whole file.

LimitedInputStream

/**
 * The Class LimitedInputStream.
 *
 * @author sysadmin
 */
public class LimitedInputStream extends FileInputStream {

	/** The length. */
	private long length;
	
	/** The counter. */
	private long counter = 0;
	
	/** The input stream. */
	private InputStream inputStream;

	/**
	 * Instantiates a new limited input stream.
	 *
	 * @param length the length
	 * @param inputStream the input stream
	 * @throws Exception the exception
	 */
	public LimitedInputStream(long length, FileInputStream inputStream)
			throws Exception {
		this(length, inputStream, inputStream.getFD());
	}

	/**
	 * Instantiates a new limited input stream.
	 *
	 * @param length the length
	 * @param inputStream the input stream
	 * @param file the file
	 * @throws FileNotFoundException the file not found exception
	 */
	protected LimitedInputStream(long length, InputStream inputStream, File file)
			throws FileNotFoundException {
		super(file);
		this.length = length;
		this.inputStream = inputStream;
	}

	/**
	 * Instantiates a new limited input stream.
	 *
	 * @param file the file
	 * @throws FileNotFoundException the file not found exception
	 */
	protected LimitedInputStream(File file) throws FileNotFoundException {
		super(file);
	}

	/**
	 * Instantiates a new limited input stream.
	 *
	 * @param fdObj the fd obj
	 */
	protected LimitedInputStream(FileDescriptor fdObj) {
		super(fdObj);
	}

	/**
	 * Instantiates a new limited input stream.
	 *
	 * @param name the name
	 * @throws FileNotFoundException the file not found exception
	 */
	protected LimitedInputStream(String name) throws FileNotFoundException {
		super(name);
	}

	/**
	 * Instantiates a new limited input stream.
	 *
	 * @param length the length
	 * @param inputStream the input stream
	 * @param fdObj the fd obj
	 */
	protected LimitedInputStream(long length, InputStream inputStream,
			FileDescriptor fdObj) {
		super(fdObj);
		this.length = length;
		this.inputStream = inputStream;
	}

	/**
	 * Instantiates a new limited input stream.
	 *
	 * @param length the length
	 * @param inputStream the input stream
	 * @param name the name
	 * @throws FileNotFoundException the file not found exception
	 */
	protected LimitedInputStream(long length, InputStream inputStream,
			String name) throws FileNotFoundException {
		super(name);
		this.length = length;
		this.inputStream = inputStream;
	}

	/* (non-Javadoc)
	 * @see java.io.FileInputStream#read()
	 */
	@Override
	public int read() throws IOException {
		if (counter < length) {
			int read = inputStream.read();
			counter = counter + read;
			return read;
		} else {
			return -1;
		}
	}
}