| 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 |
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 29 |
*/ |
| 30 |
#ifndef _D_UTIL_H |
| 31 |
#define _D_UTIL_H |
| 32 |
|
| 33 |
#include "rohc.h" |
| 34 |
|
| 35 |
#define OLD_REF_VALUE 0 |
| 36 |
#define LAST_REF_VALUE 1 |
| 37 |
|
| 38 |
// IP-id struct |
| 39 |
struct sd_ip_id_decode |
| 40 |
{ |
| 41 |
int id_ref; |
| 42 |
int sn_ref; |
| 43 |
}; |
| 44 |
|
| 45 |
// Least Significant Bits decoding |
| 46 |
struct sd_lsb_decode |
| 47 |
{ |
| 48 |
int v_ref_d; |
| 49 |
int old_v_ref_d; |
| 50 |
int p; |
| 51 |
}; |
| 52 |
// initiate the ip-id struct |
| 53 |
// in: the ip-id struct, the reference for ip-id, the sequenze number |
| 54 |
void d_ip_id_init(struct sd_ip_id_decode * s,int id_ref, int sn_ref); |
| 55 |
|
| 56 |
// Decode the ip-id offset in packet m and return the ip_id |
| 57 |
// Do not forget to update the id_ref and sn_ref after a crc-success |
| 58 |
// in: the ip-id struct, the packet m containing the ip-id offset, the |
| 59 |
// length of the offset and the sequence number of packet m. |
| 60 |
// out:ip_id |
| 61 |
int d_ip_id_decode(struct sd_ip_id_decode * s, int m, int length, int sn); |
| 62 |
|
| 63 |
// update the reference values for the ip-id and the sequence number |
| 64 |
void d_ip_id_update(struct sd_ip_id_decode * s, int id_ref, int sn_ref); |
| 65 |
|
| 66 |
// update the reference value |
| 67 |
void d_lsb_update(struct sd_lsb_decode * s, int v_ref_d); |
| 68 |
|
| 69 |
// copy the value in v_ref_d to old_v_ref_d |
| 70 |
void d_lsb_sync_ref(struct sd_lsb_decode * s); |
| 71 |
|
| 72 |
// get the old value of v_ref_d |
| 73 |
int d_get_lsb_old_ref(struct sd_lsb_decode * s); |
| 74 |
|
| 75 |
// Decode a LSB-value, do not forget to update the v_ref_d after a CRC-success |
| 76 |
// in: the struct were the old received value is present |
| 77 |
// the LSB-value to decode and the length of it in bits |
| 78 |
// |
| 79 |
// out:the decoded value |
| 80 |
int d_lsb_decode(struct sd_lsb_decode * s, int m,int length); |
| 81 |
|
| 82 |
// Initiate the lsb struct |
| 83 |
// in: the value of v_ref_d and type of p value |
| 84 |
void d_lsb_init(struct sd_lsb_decode * s,int v_ref_d, int p); |
| 85 |
|
| 86 |
// get the reference value |
| 87 |
int d_get_lsb_ref(struct sd_lsb_decode * s); |
| 88 |
|
| 89 |
// Decide if the field is a padding field |
| 90 |
// Return: 1 = padding |
| 91 |
// 0 = else |
| 92 |
int d_is_paddning(const unsigned char *); |
| 93 |
|
| 94 |
// Decide if the field is a feedback field |
| 95 |
// Return: 1 = feedback header |
| 96 |
// 0 = else |
| 97 |
int d_is_feedback(const unsigned char *); |
| 98 |
|
| 99 |
// Decide if the field is a segment field |
| 100 |
// Return: 1 = segment |
| 101 |
// 0 = else |
| 102 |
int d_is_segment(const unsigned char *); |
| 103 |
|
| 104 |
// Return the size of the feedback |
| 105 |
// In: Bytes of a feedback header |
| 106 |
// Out: Size |
| 107 |
int d_feedback_size(const unsigned char *); |
| 108 |
|
| 109 |
// Decide how many bytes the feedback header is |
| 110 |
// In: Bytes of a feedback header |
| 111 |
// Out: the size in bytes (1-2) |
| 112 |
int d_feedback_headersize(const unsigned char *); |
| 113 |
|
| 114 |
// Check if a byte is a add-cid value |
| 115 |
// It is also possible to use d_decode_add_cid instead. |
| 116 |
// In: Bytes |
| 117 |
// Out: 1 = Add-cid value |
| 118 |
// 0 = else |
| 119 |
int d_is_add_cid(const unsigned char *); |
| 120 |
|
| 121 |
// Decode the add-cid value |
| 122 |
// In: Bytes |
| 123 |
// Out: 1-15, cid value |
| 124 |
// 0, no cid value |
| 125 |
int d_decode_add_cid(const unsigned char *); |
| 126 |
|
| 127 |
// Decide if a byte is a ir-field |
| 128 |
// In: Bytes |
| 129 |
// Out: 1 = IR, 0 = else |
| 130 |
int d_is_ir(const unsigned char *); |
| 131 |
|
| 132 |
// Decide if a byte is a irdyn-field |
| 133 |
// In: Bytes |
| 134 |
// Out: 1 = IR-Dyn, 0 = else |
| 135 |
int d_is_irdyn(const unsigned char *); |
| 136 |
|
| 137 |
// Decide the size of the self-decsribing variable-length value |
| 138 |
// In: Bytes |
| 139 |
// Out: 1-4 |
| 140 |
int d_sdvalue_size(const unsigned char *); |
| 141 |
|
| 142 |
// Decode a self-describing variable-length value |
| 143 |
// In: Bytes |
| 144 |
// Out: The self-describing variable-length value |
| 145 |
int d_sdvalue_decode(const unsigned char *); |
| 146 |
|
| 147 |
// Decode the static part of a ipv4 rohc packet and store it in a ip-structure |
| 148 |
// Return the number of used bytes |
| 149 |
int d_decode_static_ip4(const unsigned char *, struct iphdr * dest); |
| 150 |
|
| 151 |
// Decode the static part in a udp rohc packet and store it in a udp-structure |
| 152 |
// Return the number of used bytes |
| 153 |
int d_decode_static_udp(const unsigned char *, struct udphdr * dest); |
| 154 |
|
| 155 |
// Decode the dynamic part in a ipv4 rohc packet and store it in a ip-structure |
| 156 |
// Return the number of used bytes |
| 157 |
int d_decode_dynamic_ip4(const unsigned char *, struct iphdr * dest, int * rnd, int * nbo); |
| 158 |
|
| 159 |
// Decode the dynamic part in a udp rohc packet and store it in a udp-structure |
| 160 |
// Return the number of used bytes |
| 161 |
int d_decode_dynamic_udp(const unsigned char *, struct udphdr * dest); |
| 162 |
|
| 163 |
// Decode the dynamic part in a udp-lite rohc packet and store it in a udp-structure |
| 164 |
// Return the number of used bytes |
| 165 |
int d_decode_dynamic_udp_lite(const unsigned char *data, struct udphdr * dest); |
| 166 |
|
| 167 |
#endif |
| 168 |
|
| 169 |
|
| 170 |
|
| 171 |
|
| 172 |
|
| 173 |
|
| 174 |
|
| 175 |
|
| 176 |
|
| 177 |
|
