feedback_create.c File Reference

Functions to create ROHC feedback. More...

#include "feedback_create.h"
#include "crc.h"
#include "rohc_debug.h"
#include "rohc_bit_ops.h"
#include "sdvl.h"
#include <string.h>
#include <assert.h>

Include dependency graph for feedback_create.c:

Functions
static bool	f_append_cid (struct d_feedback *const feedback, const uint16_t cid, const rohc_cid_type_t cid_type)
	Append the CID to the feedback packet.
void	f_feedback1 (const uint32_t sn, struct d_feedback *const feedback)
	Build a FEEDBACK-1 packet.
bool	f_feedback2 (const rohc_ack_type_t ack_type, const rohc_mode_t mode, const uint32_t sn, struct d_feedback *const feedback)
	Build a FEEDBACK-2 packet.
bool	f_add_option (struct d_feedback *const feedback, const rohc_feedback_opt_t opt_type, const unsigned char *const data, const size_t data_len)
	Add an option data to the FEEDBACK-2 packet.
uint8_t *	f_wrap_feedback (struct d_feedback *const feedback, const uint16_t cid, const rohc_cid_type_t cid_type, const rohc_feedback_crc_t protect_with_crc, const uint8_t *const crc_table, size_t *const final_size)
	Wrap the feedback packet and add a CRC option if specified.

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Detailed Description

Functions to create ROHC feedback.

Author:

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

Didier Barvaux <didier@barvaux.org>

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Function Documentation

bool f_add_option	(	struct d_feedback *const	feedback,
		const rohc_feedback_opt_t	opt_type,
		const unsigned char *const	data,
		const size_t	data_len
	)

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
data_len	The length of option data (in bytes)

Returns:

true if the option is successfully added, false otherwise

static bool f_append_cid	(	struct d_feedback *const	feedback,
		const uint16_t	cid,
		const rohc_cid_type_t	cid_type
	)		[static]

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
cid_type	The type of CID used for the feedback

Returns:

Whether the CID is successfully appended or not

void f_feedback1	(	const uint32_t	sn,
		struct d_feedback *const	feedback
	)

Build a FEEDBACK-1 packet.

Parameters:

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

bool f_feedback2	(	const rohc_ack_type_t	ack_type,
		const rohc_mode_t	mode,
		const uint32_t	sn,
		struct d_feedback *const	feedback
	)

Build a FEEDBACK-2 packet.

Parameters:

ack_type	The type of acknowledgement: ROHC_ACK_TYPE_ACK, ROHC_ACK_TYPE_NACK, ROHC_ACK_TYPE_STATIC_NACK
mode	The mode in which ROHC operates: ROHC_U_MODE, ROHC_O_MODE, ROHC_R_MODE
sn	The Sequence Number (SN) the feedback packet is associated with, zero if unknown
feedback	The feedback packet to build

Returns:

true if the packet is successfully built, false otherwise

uint8_t* f_wrap_feedback	(	struct d_feedback *const	feedback,
		const uint16_t	cid,
		const rohc_cid_type_t	cid_type,
		const rohc_feedback_crc_t	protect_with_crc,
		const uint8_t *const	crc_table,
		size_t *const	final_size
	)

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

Warning:

CID may be greater than MAX_CID if the context was not found and generated a No Context feedback; it must however respect CID type

Parameters:

feedback	The feedback packet to which the CID must be appended
cid	The Context ID (CID) to append
cid_type	The type of CID used for the feedback
protect_with_crc	Whether the CRC option must be added or not
crc_table	The pre-computed table for fast CRC computation
final_size	OUT: The final size of the feedback packet

Returns:

The feedback packet if successful, NULL otherwise