Gets an unsigned 32-bit integer at the current {@code readerIndex}and increases the {@code readerIndex} by {@code 4} in this buffer.
@throws IndexOutOfBoundsException if {@code this.readableBytes} is less than {@code 4}
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.