The generic decompression context. More...

#include <d_generic.h>

Collaboration diagram for d_generic_context:

Data Fields
struct d_generic_changes *	last1
	Information about the previous outer IP header.
struct d_generic_changes *	last2
	Information about the previous inner IP header.
struct d_generic_changes *	active1
	Information about the current outer IP header.
struct d_generic_changes *	active2
	Information about the current inner IP header.
int	first_packet_processed
	Whether at least packet was already processed by the context or not.
struct d_lsb_decode	sn
	The LSB-encoded Sequence Number (SN)
struct d_ip_id_decode	ip_id1
	The IP-ID of the outer IP header.
struct d_ip_id_decode	ip_id2
	The IP-ID of the inner IP header.
struct list_decomp *	list_decomp1
	The list decompressor of the outer IP header.
struct list_decomp *	list_decomp2
	The list decompressor of the inner IP header.
int	multiple_ip
	Whether the decompressed packet contains a 2nd IP header.
rohc_packet_t	packet_type
	The type of packet the decompressor may receive: IR, IR-DYN, UO*.
unsigned short	next_header_proto
	The IP protocol ID of the protocol the context is able to decompress.
unsigned int	next_header_len
	The length of the next header.
int(*	build_next_header )(struct d_generic_context context, struct d_generic_changes active, unsigned char *dest, int payload_size)
	The handler used to build the uncompressed next header thanks to context information.
int(*	decode_static_next_header )(struct d_generic_context context, const unsigned char packet, unsigned int length, unsigned char *dest)
	The handler used to decode the static part of the next header in the ROHC packet.
int(*	decode_dynamic_next_header )(struct d_generic_context context, const unsigned char packet, unsigned int length, unsigned char *dest)
	The handler used to decode the dynamic part of the next header in the ROHC packet.
int(*	decode_uo_tail )(struct d_generic_context context, const unsigned char packet, unsigned int length, unsigned char *dest)
	The handler used to decode the tail of the UO* ROHC packet.
unsigned int(*	compute_crc_static )(const unsigned char const ip, const unsigned char const ip2, const unsigned char const next_header, const unsigned int crc_type, const unsigned int init_val, const unsigned char const crc_table)
	The handler used to compute the CRC-STATIC value.
unsigned int(*	compute_crc_dynamic )(const unsigned char const ip, const unsigned char const ip2, const unsigned char const next_header, const unsigned int crc_type, const unsigned int init_val, const unsigned char const crc_table)
	The handler used to compute the CRC-DYNAMIC value.
void *	specific
	Profile-specific data.
unsigned int	correction_counter
	Correction counter (see e and f in 5.3.2.2.4 of the RFC 3095)
unsigned int	last_packet_time
	The timestamp of the last CRC-approved packet.
unsigned int	current_packet_time
	The timestamp of the current packet (not yet CRC-tested)
unsigned int	inter_arrival_time
	The average inter-packet time over the last few packets.

Detailed Description

The generic decompression context.

The object defines the generic context that manages IP(/nextheader) and IP/IP(/nextheader) packets. nextheader is managed by the profile-specific part of the context.

Field Documentation

struct d_generic_changes* d_generic_context::active1

Information about the current outer IP header.

Referenced by d_generic_create(), d_generic_decode(), d_generic_decode_ir(), d_generic_destroy(), d_generic_detect_ir_dyn_size(), d_rtp_create(), d_udp_create(), d_udp_destroy(), d_udp_lite_create(), d_udp_lite_destroy(), decode_extension3(), decode_irdyn(), decode_uo0(), decode_uo1(), decode_uor2(), ip_decode_dynamic_ip(), rtp_decode_dynamic_rtp(), sync_on_failure(), and synchronize().

struct d_generic_changes* d_generic_context::active2

Information about the current inner IP header.

Referenced by d_generic_create(), d_generic_decode(), d_generic_decode_ir(), d_generic_destroy(), d_generic_detect_ir_dyn_size(), d_rtp_create(), d_udp_create(), d_udp_destroy(), d_udp_lite_create(), d_udp_lite_destroy(), decode_extension3(), decode_irdyn(), decode_uo0(), decode_uo1(), decode_uor2(), ip_decode_dynamic_ip(), rtp_decode_dynamic_rtp(), sync_on_failure(), and synchronize().

int(* d_generic_context::build_next_header)(struct d_generic_context *context, struct d_generic_changes *active, unsigned char *dest, int payload_size)

The handler used to build the uncompressed next header thanks to context information.

Referenced by d_generic_decode_ir(), d_rtp_create(), d_udp_create(), d_udp_lite_create(), decode_irdyn(), decode_uo0(), decode_uo1(), and decode_uor2().

unsigned int(* d_generic_context::compute_crc_dynamic)(const unsigned char *const ip, const unsigned char *const ip2, const unsigned char *const next_header, const unsigned int crc_type, const unsigned int init_val, const unsigned char *const crc_table)

The handler used to compute the CRC-DYNAMIC value.

Referenced by d_generic_create(), d_rtp_create(), d_udp_create(), d_udp_lite_create(), decode_uo0(), decode_uo1(), and decode_uor2().

unsigned int(* d_generic_context::compute_crc_static)(const unsigned char *const ip, const unsigned char *const ip2, const unsigned char *const next_header, const unsigned int crc_type, const unsigned int init_val, const unsigned char *const crc_table)

The handler used to compute the CRC-STATIC value.

Referenced by d_generic_create(), d_rtp_create(), d_udp_create(), d_udp_lite_create(), decode_uo0(), decode_uo1(), and decode_uor2().

unsigned int d_generic_context::correction_counter

Correction counter (see e and f in 5.3.2.2.4 of the RFC 3095)

Referenced by d_generic_decode_ir(), decode_irdyn(), decode_uo0(), decode_uo1(), and decode_uor2().

unsigned int d_generic_context::current_packet_time

The timestamp of the current packet (not yet CRC-tested)

Referenced by d_generic_decode(), d_generic_decode_ir(), and update_inter_packet().

int(* d_generic_context::decode_dynamic_next_header)(struct d_generic_context *context, const unsigned char *packet, unsigned int length, unsigned char *dest)

The handler used to decode the dynamic part of the next header in the ROHC packet.

Referenced by d_generic_decode_ir(), d_ip_create(), d_rtp_create(), d_udp_create(), d_udp_lite_create(), and decode_irdyn().

int(* d_generic_context::decode_static_next_header)(struct d_generic_context *context, const unsigned char *packet, unsigned int length, unsigned char *dest)

The handler used to decode the static part of the next header in the ROHC packet.

Referenced by d_generic_decode_ir(), d_rtp_create(), d_udp_create(), and d_udp_lite_create().

int(* d_generic_context::decode_uo_tail)(struct d_generic_context *context, const unsigned char *packet, unsigned int length, unsigned char *dest)

The handler used to decode the tail of the UO* ROHC packet.

Referenced by d_rtp_create(), d_udp_create(), d_udp_lite_create(), decode_uo0(), decode_uo1(), and decode_uor2().