ip_id_offset_decode.c File Reference

Offset IP-ID decoding. More...

#include "ip_id_offset_decode.h"
#include "lsb_decode.h"
#include <stdlib.h>
#include <assert.h>

Include dependency graph for ip_id_offset_decode.c:

Data Structures
struct	ip_id_offset_decode
	Defines a IP-ID object to help computing the IP-ID value from an IP-ID offset. More...
Functions
struct ip_id_offset_decode *	ip_id_offset_new (void)
	Create a new Offset IP-ID decoding context.
void	ip_id_offset_free (struct ip_id_offset_decode *const ipid)
	Destroy a given Offset IP-ID decoding context.
bool	ip_id_offset_decode (const struct ip_id_offset_decode *const ipid, const uint16_t m, const size_t k, const uint32_t sn, uint16_t *const decoded)
	Decode the given IP-ID offset.
void	ip_id_offset_set_ref (struct ip_id_offset_decode *const ipid, const uint16_t id_ref, const uint32_t sn_ref)
	Update the reference values for the IP-ID and the SN.

---

Detailed Description

Offset IP-ID decoding.

Author:

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

Didier Barvaux <didier@barvaux.org>

The hackers from ROHC for Linux

---

Function Documentation

bool ip_id_offset_decode	(	const struct ip_id_offset_decode *const	ipid,
		const uint16_t	m,
		const size_t	k,
		const uint32_t	sn,
		uint16_t *const	decoded
	)

Decode the given IP-ID offset.

Parameters:

ipid	The Offset IP-ID object
m	The IP-ID offset to decode
k	The number of bits used to code the IP-ID offset
sn	The SN of the ROHC packet that contains the IP-ID offset
decoded	OUT: The computed IP-ID

Returns:

true in case of success, false otherwise

References ip_id_offset_decode::lsb, and rohc_lsb_decode16().

void ip_id_offset_free

(

struct ip_id_offset_decode *const

ipid

)

Destroy a given Offset IP-ID decoding context.

See 4.5.5 in the RFC 3095 for details about Offset IP-ID encoding.

Parameters:

ipid	The Offset IP-ID decoding context to destroy

References ip_id_offset_decode::lsb, and rohc_lsb_free().

Referenced by d_generic_create(), and d_generic_destroy().

struct ip_id_offset_decode* ip_id_offset_new

(

void

)

[read]

Create a new Offset IP-ID decoding context.

See 4.5.5 in the RFC 3095 for details about Offset IP-ID encoding.

Returns:

The new Offset IP-ID decoding context in case of success, NULL otherwise

References ip_id_offset_decode::lsb, rohc_lsb_new(), and ROHC_LSB_SHIFT_IP_ID.

Referenced by d_generic_create().

void ip_id_offset_set_ref	(	struct ip_id_offset_decode *const	ipid,
		const uint16_t	id_ref,
		const uint32_t	sn_ref
	)

Update the reference values for the IP-ID and the SN.

Parameters:

ipid	The Offset IP-ID decoding object
id_ref	The new IP-ID reference
sn_ref	The new SN reference

References ip_id_offset_decode::lsb, and rohc_lsb_set_ref().