feedback.c File Reference

ROHC feedback routines. More...

#include "feedback.h"
#include "rohc_traces.h"

Include dependency graph for feedback.c:

Functions
int	f_append_cid (struct d_feedback *feedback, int cid, int largecidUsed)
	Append the CID to the feedback packet.
int	f_feedback1 (int sn, struct d_feedback *feedback)
	Build a FEEDBACK-1 packet.
void	f_feedback2 (int acktype, int mode, int sn, struct d_feedback *feedback)
	Build a FEEDBACK-2 packet.
int	f_add_option (struct d_feedback *feedback, int opt_type, unsigned char *data)
	Add an option data to the FEEDBACK-2 packet.
unsigned char *	f_wrap_feedback (struct d_feedback *feedback, int cid, int largecidUsed, int with_crc, int *final_size)
	Wrap the feedback packet and add a CRC option if specified.

---

Detailed Description

ROHC feedback routines.

Author:

Didier Barvaux <didier.barvaux@toulouse.viveris.com>

The hackers from ROHC for Linux

---

Function Documentation

int f_add_option	(	struct d_feedback *	feedback,
		int	opt_type,
		unsigned char *	data
	)

Add an option data to the FEEDBACK-2 packet.

Parameters:

feedback	The feedback packet to which the option must be added
opt_type	The type of option to add
data	The option data

Returns:

Whether the option is successfully added or not

References d_feedback::data, OPT_TYPE_CRC, d_feedback::size, and d_feedback::type.

Referenced by d_optimistic_feedback(), f_feedback2(), and f_wrap_feedback().

int f_append_cid	(	struct d_feedback *	feedback,
		int	cid,
		int	largecidUsed
	)

Append the CID to the feedback packet.

Parameters:

feedback	The feedback packet to which the CID must be appended
cid	The Context ID (CID) to append
largecidUsed	Whether large CIDs are used or not

Returns:

Whether the CID is successfully appended or not

References c_bytesSdvl(), c_encodeSdvl(), d_feedback::data, rohc_debugf, d_feedback::size, and zfree.

Referenced by f_wrap_feedback().

int f_feedback1	(	int	sn,
		struct d_feedback *	feedback
	)

Build a FEEDBACK-1 packet.

Parameters:

sn	The Sequence Number (SN) the feedback packet is associated with
feedback	The feedback packet to build

Returns:

Whether the build is successful or not

References d_feedback::data, d_feedback::size, and d_feedback::type.

void f_feedback2	(	int	acktype,
		int	mode,
		int	sn,
		struct d_feedback *	feedback
	)

Build a FEEDBACK-2 packet.

Parameters:

acktype	The type of acknowledgement: ACK, NACK or S-NACK
mode	The mode in which ROHC operates: U_MODE, O_MODE or R_MODE
sn	The Sequence Number (SN) the feedback packet is associated with
feedback	The feedback packet to build

References d_feedback::data, f_add_option(), OPT_TYPE_SN, rohc_debugf, d_feedback::size, and d_feedback::type.

Referenced by d_change_mode_feedback(), and d_optimistic_feedback().

unsigned char* f_wrap_feedback	(	struct d_feedback *	feedback,
		int	cid,
		int	largecidUsed,
		int	with_crc,
		int *	final_size
	)

Wrap the feedback packet and add a CRC option if specified.

Parameters:

feedback	The feedback packet to which the CID must be appended
cid	The Context ID (CID) to append
largecidUsed	Whether large CIDs are used or not
with_crc	Whether the CRC option must be added or not
final_size	OUT: The final size of the feedback packet

Returns:

The feedback packet if successful, NULL otherwise

References crc_calculate(), CRC_INIT_8, CRC_TYPE_8, d_feedback::data, f_add_option(), f_append_cid(), OPT_TYPE_CRC, rohc_debugf, and d_feedback::size.

Referenced by d_change_mode_feedback(), and d_optimistic_feedback().