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/* |
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ROHC Project 2003 at Lulea University of Technology, Sweden. |
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Authors: Andreas Vernersson <andver-8@student.luth.se> |
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Daniel Pettersson <danpet-7@student.luth.se> |
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Erik Soderstrom <soderstrom@yahoo.com> |
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Fredrik Lindstrom <frelin-9@student.luth.se> |
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Johan Stenmark <johste-8@student.luth.se> |
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Martin Juhlin <juhlin@users.sourceforge.net> |
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Mikael Larsson <larmik-9@student.luth.se> |
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Robert Maxe <robmax-1@student.luth.se> |
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|
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Copyright (C) 2003 Andreas Vernersson, Daniel Pettersson, |
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Erik Soderström, Fredrik Lindström, Johan Stenmark, |
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Martin Juhlin, Mikael Larsson, Robert Maxe. |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#ifndef _D_UTIL_H |
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#define _D_UTIL_H |
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|
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#include <linux/ip.h> |
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#include <linux/udp.h> |
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#include "rohc.h" |
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|
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#define OLD_REF_VALUE 0 |
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#define LAST_REF_VALUE 1 |
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|
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// IP-id struct |
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struct sd_ip_id_decode |
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{ |
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int id_ref; |
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int sn_ref; |
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}; |
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|
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// Least Significant Bits decoding |
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struct sd_lsb_decode |
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{ |
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int v_ref_d; |
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int old_v_ref_d; |
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int p; |
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}; |
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// initiate the ip-id struct |
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// in: the ip-id struct, the reference for ip-id, the sequenze number |
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void d_ip_id_init(struct sd_ip_id_decode * s,int id_ref, int sn_ref); |
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|
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// Decode the ip-id offset in packet m and return the ip_id |
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// Do not forget to update the id_ref and sn_ref after a crc-success |
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// in: the ip-id struct, the packet m containing the ip-id offset, the |
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// length of the offset and the sequence number of packet m. |
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// out:ip_id |
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int d_ip_id_decode(struct sd_ip_id_decode * s, int m, int length, int sn); |
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|
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// update the reference values for the ip-id and the sequence number |
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void d_ip_id_update(struct sd_ip_id_decode * s, int id_ref, int sn_ref); |
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|
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// update the reference value |
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void d_lsb_update(struct sd_lsb_decode * s, int v_ref_d); |
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|
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// copy the value in v_ref_d to old_v_ref_d |
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void d_lsb_sync_ref(struct sd_lsb_decode * s); |
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|
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// get the old value of v_ref_d |
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int d_get_lsb_old_ref(struct sd_lsb_decode * s); |
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|
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// Decode a LSB-value, do not forget to update the v_ref_d after a CRC-success |
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// in: the struct were the old received value is present |
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// the LSB-value to decode and the length of it in bits |
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// |
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// out:the decoded value |
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int d_lsb_decode(struct sd_lsb_decode * s, int m,int length); |
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|
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// Initiate the lsb struct |
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// in: the value of v_ref_d and type of p value |
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void d_lsb_init(struct sd_lsb_decode * s,int v_ref_d, int p); |
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|
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// get the reference value |
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int d_get_lsb_ref(struct sd_lsb_decode * s); |
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|
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// Decide if the field is a padding field |
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// Return: 1 = padding |
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// 0 = else |
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int d_is_paddning(const unsigned char *); |
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|
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// Decide if the field is a feedback field |
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// Return: 1 = feedback header |
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// 0 = else |
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int d_is_feedback(const unsigned char *); |
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|
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// Decide if the field is a segment field |
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// Return: 1 = segment |
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// 0 = else |
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int d_is_segment(const unsigned char *); |
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|
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// Return the size of the feedback |
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// In: Bytes of a feedback header |
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// Out: Size |
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int d_feedback_size(const unsigned char *); |
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|
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// Decide how many bytes the feedback header is |
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// In: Bytes of a feedback header |
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// Out: the size in bytes (1-2) |
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int d_feedback_headersize(const unsigned char *); |
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|
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// Check if a byte is a add-cid value |
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// It is also possible to use d_decode_add_cid instead. |
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// In: Bytes |
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// Out: 1 = Add-cid value |
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// 0 = else |
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int d_is_add_cid(const unsigned char *); |
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|
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// Decode the add-cid value |
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// In: Bytes |
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// Out: 1-15, cid value |
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// 0, no cid value |
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int d_decode_add_cid(const unsigned char *); |
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|
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// Decide if a byte is a ir-field |
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// In: Bytes |
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// Out: 1 = IR, 0 = else |
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int d_is_ir(const unsigned char *); |
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|
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// Decide if a byte is a irdyn-field |
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// In: Bytes |
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// Out: 1 = IR-Dyn, 0 = else |
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int d_is_irdyn(const unsigned char *); |
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|
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// Decide the size of the self-decsribing variable-length value |
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// In: Bytes |
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// Out: 1-4 |
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int d_sdvalue_size(const unsigned char *); |
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|
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// Decode a self-describing variable-length value |
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// In: Bytes |
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// Out: The self-describing variable-length value |
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int d_sdvalue_decode(const unsigned char *); |
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|
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// Decode the static part of a ipv4 rohc packet and store it in a ip-structure |
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// Return the number of used bytes |
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int d_decode_static_ip4(const unsigned char *, struct iphdr * dest); |
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|
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// Decode the static part in a udp rohc packet and store it in a udp-structure |
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// Return the number of used bytes |
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int d_decode_static_udp(const unsigned char *, struct udphdr * dest); |
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|
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// Decode the dynamic part in a ipv4 rohc packet and store it in a ip-structure |
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// Return the number of used bytes |
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int d_decode_dynamic_ip4(const unsigned char *, struct iphdr * dest, int * rnd, int * nbo); |
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|
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// Decode the dynamic part in a udp rohc packet and store it in a udp-structure |
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// Return the number of used bytes |
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int d_decode_dynamic_udp(const unsigned char *, struct udphdr * dest); |
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|
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// Decode the dynamic part in a udp-lite rohc packet and store it in a udp-structure |
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// Return the number of used bytes |
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int d_decode_dynamic_udp_lite(const unsigned char *data, struct udphdr * dest); |
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|
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#endif |
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