src/rohc/comp.h

/*
    ROHC Project 2003 at Lulea University of Technology, Sweden.
    Authors: Andreas Vernersson <andver-8@student.luth.se>
             Daniel Pettersson <danpet-7@student.luth.se>
             Erik Soderstrom <soderstrom@yahoo.com>
             Fredrik Lindstrom <frelin-9@student.luth.se>
             Johan Stenmark <johste-8@student.luth.se>
             Martin Juhlin <juhlin@users.sourceforge.net>
             Mikael Larsson <larmik-9@student.luth.se>
             Robert Maxe <robmax-1@student.luth.se>
             
    Copyright (C) 2003 Andreas Vernersson, Daniel Pettersson, 
    Erik Soderström, Fredrik Lindström, Johan Stenmark, 
    Martin Juhlin, Mikael Larsson, Robert Maxe.  

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/    
/***************************************************************************
 * File:        comp.h                                                     *
 * Description: Functions and structures for the compressor framework      *
 ***************************************************************************/

#ifndef _COMP_H
#define _COMP_H

#include "rohc.h"

/////////////////////////////////////////////////////////////////////
// Public functions

struct sc_rohc;
struct sc_context;
struct sc_feedback;

/* Allocate space for a compressor (transmit side) */
void    *rohc_alloc_compressor(int max_cid);

/* Free space used by a compressor */
void    rohc_free_compressor(struct sc_rohc *compressor);

/* Compress a packet */
int     rohc_compress(struct sc_rohc *compressor, unsigned char *ibuf, int isize,
                           unsigned char *obuf, int osize);

/* Store static info (about profiles etc) in the buffer (no compressor is needed) */
int     rohc_c_info(char *buffer);

/* Store compression statistics for a compressor in the buffer */
int     rohc_c_statistics(struct sc_rohc *compressor, char *buffer);

/* Store context statistics for a compressor in the buffer */
int     rohc_c_context(struct sc_rohc *compressor, int index, char *buffer);

/* Get compressor enabled/disable status */
int     rohc_c_is_enabled(struct sc_rohc *compressor);

/* Is the compressor using small cid? */
int     rohc_c_using_small_cid(struct sc_rohc * ch);


// Functions used by rohc's proc device

void rohc_c_set_header(struct sc_rohc *compressor, int value);
void rohc_c_set_mrru(struct sc_rohc *compressor, int value);
void rohc_c_set_max_cid(struct sc_rohc *compressor, int value);
void rohc_c_set_large_cid(struct sc_rohc *compressor, int value);
void rohc_c_set_connection_type(struct sc_rohc *compressor, int value);
void rohc_c_set_enable(struct sc_rohc *compressor, int value);

// These functions are used by the decompressor to send feedback..

// Add this feedback to the next outgoing ROHC packet:
void c_piggyback_feedback(struct sc_rohc *,unsigned char *, int size);

// Deliver received feedback in in decompressor to compressor..
void c_deliver_feedback(struct sc_rohc *,unsigned char *packet, int size);


/////////////////////////////////////////////////////////////////////
// Profiles

#define C_NUM_PROFILES 4

// The generic interface to compression profiles

// To implement a new profile you need to implement the following interface
// (see c_ip.c or c_udp.c for examples) and add it to the "c_profiles" array
// in comp.c

struct sc_profile {
        unsigned short protocol; // IP-Protocol
        unsigned short id;       // Profile ID
        char *version;           // Version string
        char *description;       // Description string

        // Called when a new context should be initialized, based on the given packet
        int (*create)(struct sc_context *context, const struct iphdr *packet);

        // Destroy profile specific data in context
        void (*destroy)(struct sc_context *context);

        // Check if the packet belongs to the given context (using STATIC-DEF fields etc) */
        int (*check_context)(struct sc_context *context, const struct iphdr *packet);

        // Compress the packet using the given context. Payload_offset indicates where the
        // payload starts. Returns the size of the compressed packet or <=0 in case of an
        // error..
        int (*encode)(struct sc_context *, const struct iphdr *packet, int packet_size,
                        unsigned char *dest, int dest_size, int *payload_offset);

        // Called when feedback to the context arrives..
        void (*feedback)(struct sc_context *, struct sc_feedback *);
};

struct sc_profile *c_get_profile_from_protocol(struct sc_rohc *comp, int protocol);
struct sc_profile *c_get_profile_from_id(struct sc_rohc *comp, int profile_id);

////////////////////////////////////////////////////////////////////////

typedef enum {U=1,O=2,R=3}    C_MODE;
typedef enum {IR=1,FO=2,SO=3} C_STATE;

struct sc_context {
        int used; // 1==used, 0==unused
        int latest_used; // time when this context was created
        int first_used; // time when this context was latest used

        int cid;
        int profile_id;
        struct sc_profile *profile;

        struct sc_rohc *compressor;

        // Parameters and initial values common for all
        // profiles:

        C_MODE c_mode;
        C_STATE c_state;

        int nbo, rnd;
        int nbo2, rnd2; // for second ip header if available

        // Statistics information
        int total_uncompressed_size, total_compressed_size;
        int header_uncompressed_size, header_compressed_size;
        int num_send_packets, num_send_ir, num_send_ir_dyn, num_recv_feedbacks;
        struct sc_wlsb *total_16_uncompressed, *total_16_compressed;
        struct sc_wlsb *header_16_uncompressed, *header_16_compressed;


        // Profile specific context here:
        void *profile_context;
};


// Create a new context
struct sc_context *c_create_context(struct sc_rohc *, struct sc_profile *profile, struct iphdr *ip);

// Find a context that match the given profile and IP-packet
struct sc_context *c_find_context(struct sc_rohc *, struct sc_profile *profile, struct iphdr *ip);

// Find a context given the CID
struct sc_context *c_get_context(struct sc_rohc *, int cid);
/////////////////////////////////////////////////////////////////////

struct sc_feedback {
        unsigned char size;  // =field(size) om field(code)==0, annars =field(code)
        int cid;

        int type;   // 1=FEEDBACK-1, 2=FEEDBACK-2

        unsigned char *data; // whole feedback packet exluding first feedback-type octet
        int specific_offset;
        int specific_size;

        // feedback-2 only:
        enum {ACK,NACK,STATIC_NACK,RESERVED} acktype; // 0=ACK, 1=NACK, 2=STATIC-NACK, 3=RESERVED
};

/////////////////////////////////////////////////////////////////////

#define FEEDBACK_BUFFER_SIZE 10 // Number of outgoing feedbacks that can be queued..

struct sc_rohc {
  int enabled;

  int max_cid;   // smallCID = [0-15], largeCID = [0-65535]
  int large_cid;

  int num_used;
  int num_allocated;
  struct sc_context *contexts; // allokeras om vid behov.

  int mrru; // Maximum reconstructed reception unit (== 0)
  int max_header_size; // Maximum header size that will be compressed
  int connection_type;

  int profiles[C_NUM_PROFILES];

  unsigned char *feedback_buffer[FEEDBACK_BUFFER_SIZE];
  unsigned int  feedback_size  [FEEDBACK_BUFFER_SIZE];
  int feedback_pointer;

  int num_packets; // total number of sent packets
  int total_compressed_size, total_uncompressed_size;

  struct sc_rohc *feedback_for;

};

int c_get_feedback(struct sc_rohc *, unsigned char *); 
void c_add_feedback(struct sc_rohc *, unsigned char *, int size);

/////////////////////////////////////////////////////////////////////

#endif
Revision:	1.3
Committed:	Tue Apr 26 00:55:56 2005 UTC (19 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_01, rel-3_0, rel-2_2, rel-2_0, rel-2_21, rel-2_22, rel-2_25, HEAD
Changes since 1.2:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			ROHC Project 2003 at Lulea University of Technology, Sweden.
3			Authors: Andreas Vernersson <andver-8@student.luth.se>
4			Daniel Pettersson <danpet-7@student.luth.se>
5			Erik Soderstrom <soderstrom@yahoo.com>
6			Fredrik Lindstrom <frelin-9@student.luth.se>
7			Johan Stenmark <johste-8@student.luth.se>
8			Martin Juhlin <juhlin@users.sourceforge.net>
9			Mikael Larsson <larmik-9@student.luth.se>
10			Robert Maxe <robmax-1@student.luth.se>
11
12			Copyright (C) 2003 Andreas Vernersson, Daniel Pettersson,
13			Erik Soderström, Fredrik Lindström, Johan Stenmark,
14			Martin Juhlin, Mikael Larsson, Robert Maxe.
15
16			This program is free software; you can redistribute it and/or modify
17			it under the terms of the GNU General Public License as published by
18			the Free Software Foundation; either version 2 of the License, or
19			(at your option) any later version.
20
21			This program is distributed in the hope that it will be useful,
22			but WITHOUT ANY WARRANTY; without even the implied warranty of
23			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24			GNU General Public License for more details.
25
26			You should have received a copy of the GNU General Public License
27			along with this program; if not, write to the Free Software
28	pcg	1.3	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29	pcg	1.1	*/
30			/***************************************************************************
31			* File: comp.h *
32			* Description: Functions and structures for the compressor framework *
33			***************************************************************************/
34
35			#ifndef _COMP_H
36			#define _COMP_H
37
38			#include "rohc.h"
39
40			/////////////////////////////////////////////////////////////////////
41			// Public functions
42
43			struct sc_rohc;
44			struct sc_context;
45			struct sc_feedback;
46
47			/* Allocate space for a compressor (transmit side) */
48			void *rohc_alloc_compressor(int max_cid);
49
50			/* Free space used by a compressor */
51			void rohc_free_compressor(struct sc_rohc *compressor);
52
53			/* Compress a packet */
54			int rohc_compress(struct sc_rohc compressor, unsigned char ibuf, int isize,
55			unsigned char *obuf, int osize);
56
57			/* Store static info (about profiles etc) in the buffer (no compressor is needed) */
58			int rohc_c_info(char *buffer);
59
60			/* Store compression statistics for a compressor in the buffer */
61			int rohc_c_statistics(struct sc_rohc compressor, char buffer);
62
63			/* Store context statistics for a compressor in the buffer */
64			int rohc_c_context(struct sc_rohc compressor, int index, char buffer);
65
66			/* Get compressor enabled/disable status */
67			int rohc_c_is_enabled(struct sc_rohc *compressor);
68
69			/* Is the compressor using small cid? */
70			int rohc_c_using_small_cid(struct sc_rohc * ch);
71
72
73			// Functions used by rohc's proc device
74
75			void rohc_c_set_header(struct sc_rohc *compressor, int value);
76			void rohc_c_set_mrru(struct sc_rohc *compressor, int value);
77			void rohc_c_set_max_cid(struct sc_rohc *compressor, int value);
78			void rohc_c_set_large_cid(struct sc_rohc *compressor, int value);
79			void rohc_c_set_connection_type(struct sc_rohc *compressor, int value);
80			void rohc_c_set_enable(struct sc_rohc *compressor, int value);
81
82			// These functions are used by the decompressor to send feedback..
83
84			// Add this feedback to the next outgoing ROHC packet:
85			void c_piggyback_feedback(struct sc_rohc ,unsigned char , int size);
86
87			// Deliver received feedback in in decompressor to compressor..
88			void c_deliver_feedback(struct sc_rohc ,unsigned char packet, int size);
89
90
91			/////////////////////////////////////////////////////////////////////
92			// Profiles
93
94			#define C_NUM_PROFILES 4
95
96			// The generic interface to compression profiles
97
98			// To implement a new profile you need to implement the following interface
99			// (see c_ip.c or c_udp.c for examples) and add it to the "c_profiles" array
100			// in comp.c
101
102			struct sc_profile {
103			unsigned short protocol; // IP-Protocol
104			unsigned short id; // Profile ID
105			char *version; // Version string
106			char *description; // Description string
107
108			// Called when a new context should be initialized, based on the given packet
109			int (create)(struct sc_context context, const struct iphdr *packet);
110
111			// Destroy profile specific data in context
112			void (destroy)(struct sc_context context);
113
114			// Check if the packet belongs to the given context (using STATIC-DEF fields etc) */
115			int (check_context)(struct sc_context context, const struct iphdr *packet);
116
117			// Compress the packet using the given context. Payload_offset indicates where the
118			// payload starts. Returns the size of the compressed packet or <=0 in case of an
119			// error..
120			int (encode)(struct sc_context , const struct iphdr *packet, int packet_size,
121			unsigned char dest, int dest_size, int payload_offset);
122
123			// Called when feedback to the context arrives..
124			void (feedback)(struct sc_context , struct sc_feedback *);
125			};
126
127			struct sc_profile c_get_profile_from_protocol(struct sc_rohc comp, int protocol);
128			struct sc_profile c_get_profile_from_id(struct sc_rohc comp, int profile_id);
129
130			////////////////////////////////////////////////////////////////////////
131
132			typedef enum {U=1,O=2,R=3} C_MODE;
133			typedef enum {IR=1,FO=2,SO=3} C_STATE;
134
135			struct sc_context {
136			int used; // 1==used, 0==unused
137			int latest_used; // time when this context was created
138			int first_used; // time when this context was latest used
139
140			int cid;
141			int profile_id;
142			struct sc_profile *profile;
143
144			struct sc_rohc *compressor;
145
146			// Parameters and initial values common for all
147			// profiles:
148
149			C_MODE c_mode;
150			C_STATE c_state;
151
152			int nbo, rnd;
153			int nbo2, rnd2; // for second ip header if available
154
155			// Statistics information
156			int total_uncompressed_size, total_compressed_size;
157			int header_uncompressed_size, header_compressed_size;
158			int num_send_packets, num_send_ir, num_send_ir_dyn, num_recv_feedbacks;
159			struct sc_wlsb total_16_uncompressed, total_16_compressed;
160			struct sc_wlsb header_16_uncompressed, header_16_compressed;
161
162
163			// Profile specific context here:
164			void *profile_context;
165			};
166
167
168			// Create a new context
169			struct sc_context c_create_context(struct sc_rohc , struct sc_profile profile, struct iphdr ip);
170
171			// Find a context that match the given profile and IP-packet
172			struct sc_context c_find_context(struct sc_rohc , struct sc_profile profile, struct iphdr ip);
173
174			// Find a context given the CID
175			struct sc_context c_get_context(struct sc_rohc , int cid);
176			/////////////////////////////////////////////////////////////////////
177
178			struct sc_feedback {
179			unsigned char size; // =field(size) om field(code)==0, annars =field(code)
180			int cid;
181
182			int type; // 1=FEEDBACK-1, 2=FEEDBACK-2
183
184			unsigned char *data; // whole feedback packet exluding first feedback-type octet
185			int specific_offset;
186			int specific_size;
187
188			// feedback-2 only:
189			enum {ACK,NACK,STATIC_NACK,RESERVED} acktype; // 0=ACK, 1=NACK, 2=STATIC-NACK, 3=RESERVED
190			};
191
192			/////////////////////////////////////////////////////////////////////
193
194			#define FEEDBACK_BUFFER_SIZE 10 // Number of outgoing feedbacks that can be queued..
195
196			struct sc_rohc {
197			int enabled;
198
199			int max_cid; // smallCID = [0-15], largeCID = [0-65535]
200			int large_cid;
201
202			int num_used;
203			int num_allocated;
204			struct sc_context *contexts; // allokeras om vid behov.
205
206			int mrru; // Maximum reconstructed reception unit (== 0)
207			int max_header_size; // Maximum header size that will be compressed
208			int connection_type;
209
210			int profiles[C_NUM_PROFILES];
211
212			unsigned char *feedback_buffer[FEEDBACK_BUFFER_SIZE];
213			unsigned int feedback_size [FEEDBACK_BUFFER_SIZE];
214			int feedback_pointer;
215
216			int num_packets; // total number of sent packets
217			int total_compressed_size, total_uncompressed_size;
218
219			struct sc_rohc *feedback_for;
220
221			};
222
223			int c_get_feedback(struct sc_rohc , unsigned char );
224			void c_add_feedback(struct sc_rohc , unsigned char , int size);
225
226			/////////////////////////////////////////////////////////////////////
227
228			#endif