ABL electronic PIC12, PIC16, PIC18 Eth_Get_Tcp_Flags, Eth_Get_Tcp_Hdr_Offset

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Eth_Get_Tcp_Hdr_Offset

mikroC - C Compiler for Microchip PIC microcontrollers

Prototype	unsigned short Eth_Get_Tcp_Hdr_Offset(void);
Returns	Returns the length (or offset) of the TCP packet header in bytes.
Description	The function returns the length (or offset) of the TCP packet header in bytes. Upon
	receiving a valid TCP packet, its header is to be analyzed in order to respond properly
	(e.g. respond to other's request, merge several packets into the message, etc.). The head-
	er length is important to know in order to be able to extract the information contained in
	it.
Requires	This function must be called after the Eth_Load_Tcp_Header, since it initializes the
	private variables used for this function.
Example	// calculate offset (TCP header length)
	tcp_options = Eth_Get_Tcp_Hdr_Offset() - 20;

Eth_Get_Tcp_Flags

Prototype	unsigned short Eth_Get_Tcp_Flags(void);
Returns	Returns the flags data from the header of the received TCP packet.
Description	The function returns the flags data from the header of the received TCP packet. TCP
	flags show various information, e.g. SYN (syncronize request), ACK (acknowledge
	receipt), and similar. It is upon these flags that, for example, a proper HTTP communi-
	cation is established.
Requires	This function must be called after the Eth_Load_Tcp_Header, since it initializes the
	private variables used for this function.
Example	flags = Eth_Get_Tcp_Flags();

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