Sets the {@code readerIndex} of this buffer.
@throws IndexOutOfBoundsException if the specified {@code readerIndex} is less than {@code 0} or greater than {@code this.writerIndex}
See Implementation
Sets the {@code readerIndex} of this buffer.
@throws IndexOutOfBoundsException if the specified {@code readerIndex} is less than {@code 0} or greater than {@code this.writerIndex}