What information is sent in a TCP packet?

Question

Programming

I am sending a parcel of ten bytes. The problem is catching them all at the other end. The partner can only process a certain number of bytes, otherwise the buffer is shifted.
TCP protocol question.
Does the packet being sent contain information about the number of bytes sent?

Answer 1

Does the packet being sent contain information about the number of bytes sent?

About the number of bytes you sent , no. The number of bytes sent by the TCP stack is indicated in the IP header. If you need framing within a TCP stream, you can organize it yourself.

Answer 2

Does the packet being sent contain information about the number of bytes sent?

If there is a TCP segment encapsulated in an IP packet, then the TCP payload length can be found as follows - from the IP payload length (calculated as the difference between the total IP packet length, Total Length, and the header length, Internet Header Length) we subtract TCP header length (Data Offset field).
If the task is different - to find out how many bytes were sent, then this information (the number of bytes transferred), as far as I remember, is returned by the send / write call.

Answer 3

Recommend a book that understands the protocols TCP UDP IP over Ethernet from the bottom. I will be glad if in Russian.