ROHC decompression context for the UDP-Lite profile. More...

#include "d_ip.h"
#include "d_udp.h"
#include "d_generic.h"
#include "rohc_bit_ops.h"
#include "rohc_traces_internal.h"
#include "rohc_debug.h"
#include "rohc_utils.h"
#include "rohc_packets.h"
#include "crc.h"
#include "protocols/udp_lite.h"
#include <string.h>

Include dependency graph for d_udp_lite.c:

Data Structures
struct	d_udp_lite_context
	Define the UDP-Lite part of the decompression profile context. More...
Functions
static void	d_udp_lite_destroy (void *const context)
	Destroy the context.
static rohc_packet_t	udp_lite_detect_packet_type (const struct rohc_decomp_ctxt const context, const uint8_t const rohc_packet, const size_t rohc_length, const size_t large_cid_len)
	Detect the type of ROHC packet for the UDP-Lite profile.
static int	udp_lite_parse_dynamic_udp (const struct rohc_decomp_ctxt const context, const uint8_t packet, const size_t length, struct rohc_extr_bits *const bits)
	Parse the UDP-Lite dynamic part of the ROHC packet.
static int	udp_lite_parse_uo_remainder (const struct rohc_decomp_ctxt const context, const unsigned char packet, unsigned int length, struct rohc_extr_bits *const bits)
	Parse the UDP-Lite remainder of the UO* ROHC packets.
static bool	udp_lite_decode_values_from_bits (const struct rohc_decomp_ctxt context, const struct rohc_extr_bits bits, struct rohc_decoded_values const decoded)
	Decode UDP-Lite values from extracted bits.
static int	udp_lite_build_uncomp_udp (const struct rohc_decomp_ctxt const context, const struct rohc_decoded_values decoded, unsigned char dest, const unsigned int payload_len)
	Build an uncompressed UDP-Lite header.
void *	d_udp_lite_create (const struct rohc_decomp_ctxt *const context)
	Create the UDP-Lite decompression context.
static rohc_status_t	d_udp_lite_decode (struct rohc_decomp const decomp, struct rohc_decomp_ctxt const context, const struct rohc_buf rohc_packet, const size_t add_cid_len, const size_t large_cid_len, struct rohc_buf const uncomp_packet, rohc_packet_t const packet_type)
	Decode one IR, IR-DYN or UO* packet for UDP-Lite profile.
Variables
struct rohc_decomp_profile	d_udplite_profile
	Define the decompression part of the UDP-Lite profile as described in the RFC 4019.

Detailed Description

ROHC decompression context for the UDP-Lite profile.

Author:: Didier Barvaux <didier.barvaux@toulouse.viveris.com>; Didier Barvaux <didier@barvaux.org>

Function Documentation

void* d_udp_lite_create ( const struct rohc_decomp_ctxt *const context )

Create the UDP-Lite decompression context.

This function is one of the functions that must exist in one profile for the framework to work.

Parameters:

context The decompression context

Returns:: The newly-created UDP-Lite decompression context

static rohc_status_t d_udp_lite_decode	(	struct rohc_decomp *const	decomp,
		struct rohc_decomp_ctxt *const	context,
		const struct rohc_buf	rohc_packet,
		const size_t	add_cid_len,
		const size_t	large_cid_len,
		struct rohc_buf *const	uncomp_packet,
		rohc_packet_t *const	packet_type
	)		`[static]`

Decode one IR, IR-DYN or UO* packet for UDP-Lite profile.

This function is one of the functions that must exist in one profile for the framework to work.

Parameters:

	decomp	The ROHC decompressor
	context	The decompression context
	rohc_packet	The ROHC packet to decode
	add_cid_len	The length of the optional Add-CID field
	large_cid_len	The length of the optional large CID field
[out]	uncomp_packet	The uncompressed packet
	packet_type	IN: The type of the ROHC packet to parse OUT: The type of the parsed ROHC packet

Returns:: ROHC_STATUS_OK if packet is successfully decoded, ROHC_STATUS_MALFORMED if packet is malformed, ROHC_STATUS_BAD_CRC if a CRC error occurs, ROHC_STATUS_ERROR if an error occurs

static void d_udp_lite_destroy ( void *const context ) [static]

Destroy the context.

This function is one of the functions that must exist in one profile for the framework to work.

Parameters:

context The compression context

static int udp_lite_build_uncomp_udp	(	const struct rohc_decomp_ctxt *const	context,
		const struct rohc_decoded_values	decoded,
		unsigned char *	dest,
		const unsigned int	payload_len
	)		`[static]`

Build an uncompressed UDP-Lite header.

Todo:: check for dest size before writing into it

Parameters:

context	The decompression context
decoded	The values decoded from the ROHC header
dest	The buffer to store the UDP-Lite header
payload_len	The length of the UDP-Lite payload

Returns:: The length of the next header (ie. the UDP-Lite header), -1 in case of error

static bool udp_lite_decode_values_from_bits	(	const struct rohc_decomp_ctxt *	context,
		const struct rohc_extr_bits	bits,
		struct rohc_decoded_values *const	decoded
	)		`[static]`

Decode UDP-Lite values from extracted bits.

The following values are decoded:

UDP-Lite source port
UDP-Lite destination port
UDP-Lite checksum
UDP-Lite Checksum Coverage (CC)

Parameters:

context	The decompression context
bits	The extracted bits
decoded	OUT: The corresponding decoded values

Returns:: true if decoding is successful, false otherwise

static rohc_packet_t udp_lite_detect_packet_type	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *const	rohc_packet,
		const size_t	rohc_length,
		const size_t	large_cid_len
	)		`[static]`

Detect the type of ROHC packet for the UDP-Lite profile.

Parse optional CCE packet type, then normal packet type.

Parameters:

context	The decompression context
rohc_packet	The ROHC packet
rohc_length	The length of the ROHC packet
large_cid_len	The length of the optional large CID field

Returns:: The packet type

static int udp_lite_parse_dynamic_udp	(	const struct rohc_decomp_ctxt *const	context,
		const uint8_t *	packet,
		const size_t	length,
		struct rohc_extr_bits *const	bits
	)		`[static]`

Parse the UDP-Lite dynamic part of the ROHC packet.

Parameters:

context	The decompression context
packet	The ROHC packet to parse
length	The length of the ROHC packet
bits	OUT: The bits extracted from the ROHC header

Returns:: The number of bytes read in the ROHC packet, -1 in case of failure

static int udp_lite_parse_uo_remainder	(	const struct rohc_decomp_ctxt *const	context,
		const unsigned char *	packet,
		unsigned int	length,
		struct rohc_extr_bits *const	bits
	)		`[static]`

Parse the UDP-Lite remainder of the UO* ROHC packets.

Parameters:

context	The decompression context
packet	The ROHC packet to parse
length	The length of the ROHC packet
bits	OUT: The bits extracted from the ROHC header

Returns:: The number of bytes read in the ROHC packet, -1 in case of failure

Variable Documentation

struct rohc_decomp_profile d_udplite_profile

Initial value:

{
        .id              = ROHC_PROFILE_UDPLITE, 
        .new_context     = d_udp_lite_create,
        .free_context    = d_udp_lite_destroy,
        .decode          = d_udp_lite_decode,
        .detect_pkt_type = udp_lite_detect_packet_type,
        .get_sn          = d_generic_get_sn,
}

Define the decompression part of the UDP-Lite profile as described in the RFC 4019.

Data Structures

Functions

Variables

Detailed Description

Function Documentation

Variable Documentation