ROHC compression context for the uncompressed profile. More...

#include "rohc_comp.h"

Include dependency graph for c_uncompressed.h:

This graph shows which files directly or indirectly include this file:

Classes
struct	sc_uncompressed_context
	The Uncompressed context. More...
Functions
void	uncompressed_decide_state (struct c_context *context)
	Decide the state that should be used for the next packet.
void	uncompressed_periodic_down_transition (struct c_context *context)
	Periodically change the context state after a certain number of packets.
void	uncompressed_change_mode (struct c_context *c, rohc_mode new_mode)
	Change the mode of the context.
void	uncompressed_change_state (struct c_context *c, rohc_c_state new_state)
	Change the state of the context.
int	uncompressed_code_packet (struct c_context context, const struct ip_packet ip, unsigned char dest, int *payload_offset, int dest_size)
	Build the ROHC packet to send.
int	uncompressed_code_IR_packet (struct c_context context, const struct ip_packet ip, unsigned char dest, int *payload_offset, int dest_size)
	Build the IR packet.
int	uncompressed_code_normal_packet (struct c_context context, const struct ip_packet ip, unsigned char dest, int *payload_offset, int dest_size)
	Build the Normal packet.

Detailed Description

ROHC compression context for the uncompressed profile.

Author:: Didier Barvaux <didier.barvaux@toulouse.viveris.com>; The hackers from ROHC for Linux

Function Documentation

void uncompressed_change_mode	(	struct c_context *	context,
		rohc_mode	new_mode
	)

Change the mode of the context.

Parameters:

context	The compression context
new_mode	The new mode the context must enter in

References IR, c_context::mode, and uncompressed_change_state().

Referenced by c_uncompressed_feedback().

void uncompressed_change_state	(	struct c_context *	context,
		rohc_c_state	new_state
	)

Change the state of the context.

Parameters:

context	The compression context
new_state	The new state the context must enter in

References sc_uncompressed_context::ir_count, sc_uncompressed_context::normal_count, c_context::specific, and c_context::state.

Referenced by c_uncompressed_feedback(), uncompressed_change_mode(), uncompressed_decide_state(), and uncompressed_periodic_down_transition().

int uncompressed_code_IR_packet	(	struct c_context *	context,
		const struct ip_packet	ip,
		unsigned char *	dest,
		int *	payload_offset,
		int	dest_size
	)

Build the IR packet.


 IR packet (5.10.1)

     0   1   2   3   4   5   6   7
    --- --- --- --- --- --- --- ---
 1 :         Add-CID octet         : if for small CIDs and (CID != 0)
   +---+---+---+---+---+---+---+---+
 2 | 1   1   1   1   1   1   0 |res|
   +---+---+---+---+---+---+---+---+
   :                               :
 3 /    0-2 octets of CID info     / 1-2 octets if for large CIDs
   :                               :
   +---+---+---+---+---+---+---+---+
 4 |          Profile = 0          | 1 octet
   +---+---+---+---+---+---+---+---+
 5 |              CRC              | 1 octet
   +---+---+---+---+---+---+---+---+
   :                               : (optional)
 6 /           IP packet           / variable length
   :                               :
    --- --- --- --- --- --- --- ---

Part 6 is not managed by this function.

Parameters:

context	The compression context
ip	The IP header
dest	The rohc-packet-under-build buffer
payload_offset	OUT: the offset of the payload in the buffer
dest_size	The maximal size of the ROHC packet

Returns:: The position in the rohc-packet-under-build buffer if successful, -1 otherwise

References c_context::cid, code_cid_values(), crc_calculate(), CRC_INIT_8, CRC_TYPE_8, rohc_debugf, and ROHC_PROFILE_UNCOMPRESSED.

Referenced by uncompressed_code_packet().

int uncompressed_code_normal_packet	(	struct c_context *	context,
		const struct ip_packet	ip,
		unsigned char *	dest,
		int *	payload_offset,
		int	dest_size
	)

Build the Normal packet.


 Normal packet (5.10.2)

     0   1   2   3   4   5   6   7
    --- --- --- --- --- --- --- ---
 1 :         Add-CID octet         : if for small CIDs and (CID != 0)
   +---+---+---+---+---+---+---+---+
 2 |   first octet of IP packet    |
   +---+---+---+---+---+---+---+---+
   :                               :
 3 /    0-2 octets of CID info     / 1-2 octets if for large CIDs
   :                               :
   +---+---+---+---+---+---+---+---+
   |                               |
 4 /      rest of IP packet        / variable length
   |                               |
   +---+---+---+---+---+---+---+---+

Part 4 is not managed by this function.

Parameters:

context	The compression context
ip	The IP header
dest	The rohc-packet-under-build buffer
payload_offset	OUT: the offset of the payload in the buffer
dest_size	The maximal size of the ROHC packet

Returns:: The position in the rohc-packet-under-build buffer if successful, -1 otherwise

References c_context::cid, code_cid_values(), ip_get_raw_data(), and rohc_debugf.

Referenced by uncompressed_code_packet().

int uncompressed_code_packet	(	struct c_context *	context,
		const struct ip_packet	ip,
		unsigned char *	dest,
		int *	payload_offset,
		int	dest_size
	)

Build the ROHC packet to send.

Parameters:

context	The compression context
ip	The IP header
dest	The rohc-packet-under-build buffer
payload_offset	OUT: the offset of the payload in the buffer
dest_size	The maximal size of the ROHC packet