I'm looking for the name of a vietnam book.?

My teacher read it to us when I took the Vietnam war cl. It was sort of told in diary entries but I don't quite remember. The part of the story I remember was he had finally been captured by the vietcong and he made out some sort of tapping code to one of his fellow PoWs in the cell next to him. They made him march in a parade so the vietnamese townspeople could throw food at them.. Then they made him appear on this Christmas video and pretend he was being treated nicely and having an okay time in exchange for seeing his family. I don't really remember anything else but if you ask questions about it to help specify I could probably answer. I need this book for a cl.