lsb.c File Reference

Least Significant Bits (LSB) encoding. More...

#include "lsb.h"

Include dependency graph for lsb.c:

Functions
void	d_lsb_init (struct d_lsb_decode *s, int v_ref_d, int p)
	Initialize a Least Significant Bits (LSB) encoding object.
int	d_lsb_decode (struct d_lsb_decode *s, int m, int k)
	Decode a LSB-encoded value.
void	d_lsb_update (struct d_lsb_decode *s, int v_ref_d)
	Update the LSB reference value.
void	d_lsb_sync_ref (struct d_lsb_decode *s)
	Replace the previous LSB reference value with the current one.
int	d_get_lsb_old_ref (struct d_lsb_decode *s)
	Get the previous LSB reference value.
int	d_get_lsb_ref (struct d_lsb_decode *s)
	Get the current LSB reference value.

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Detailed Description

Least Significant Bits (LSB) encoding.

Author:

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

The hackers from ROHC for Linux

---

Function Documentation

int d_get_lsb_old_ref

(

struct d_lsb_decode *

s

)

Get the previous LSB reference value.

Parameters:

s	The LSB object

References d_lsb_decode::old_v_ref_d.

Referenced by act_on_crc_failure().

int d_get_lsb_ref

(

struct d_lsb_decode *

s

)

Get the current LSB reference value.

Parameters:

s	The LSB object

References d_lsb_decode::v_ref_d.

Referenced by act_on_crc_failure(), d_decode_ts(), and d_generic_get_sn().

int d_lsb_decode	(	struct d_lsb_decode *	s,
		int	m,
		int	k
	)

Decode a LSB-encoded value.

See 4.5.1 in the RFC 3095 for details about LSB encoding.

Parameters:

s	The LSB object used to decode
m	The LSB value to decode
k	The length of the LSB value to decode

Returns:

The decoded value

References f(), d_lsb_decode::p, and d_lsb_decode::v_ref_d.

Referenced by act_on_crc_failure(), d_decode_ts(), decode_extension3(), and do_decode_uor2().

void d_lsb_init	(	struct d_lsb_decode *	s,
		int	v_ref_d,
		int	p
	)

Initialize a Least Significant Bits (LSB) encoding object.

See 4.5.1 in the RFC 3095 for details about LSB encoding.

Parameters:

s	The LSB object to initialize
v_ref_d	The reference value
p	The p value used to efficiently encode the values

References d_lsb_decode::old_v_ref_d, d_lsb_decode::p, and d_lsb_decode::v_ref_d.

Referenced by ip_decode_dynamic_ip(), and rtp_decode_dynamic_rtp().

void d_lsb_sync_ref

(

struct d_lsb_decode *

s

)

Replace the previous LSB reference value with the current one.

Parameters:

s	The LSB object

References d_lsb_decode::old_v_ref_d, and d_lsb_decode::v_ref_d.

Referenced by act_on_crc_failure(), decode_uo0(), decode_uo1(), decode_uor2(), and update_ts_sc().

void d_lsb_update	(	struct d_lsb_decode *	s,
		int	v_ref_d
	)

Update the LSB reference value.

This function is called after a CRC success to update the last decoded value (for example, the SN value). See 4.5.1 in the RFC 3095 for details about LSB encoding.

Parameters:

s	The LSB object
v_ref_d	The new reference value

References d_lsb_decode::v_ref_d.

Referenced by act_on_crc_failure(), decode_uo0(), decode_uo1(), decode_uor2(), and update_ts_sc().