83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/* GPRS SNDCP header compression entity management tools */
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/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Philipp Maier
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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 Affero General Public License as published by
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* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stdint.h>
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#include <osmocom/core/linuxlist.h>
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#include <openbsc/gprs_sndcp_xid.h>
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/* Header / Data compression entity */
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struct gprs_sndcp_comp {
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struct llist_head list;
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/* Serves as an ID in case we want to delete this entity later */
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unsigned int entity; /* see also: 6.5.1.1.3 and 6.6.1.1.3 */
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/* Specifies to which NSAPIs the compression entity is assigned */
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uint8_t nsapi_len; /* Number of applicable NSAPIs (default 0) */
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uint8_t nsapi[MAX_NSAPI]; /* Applicable NSAPIs (default 0) */
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/* Assigned pcomp values */
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uint8_t comp_len; /* Number of contained PCOMP / DCOMP values */
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uint8_t comp[MAX_COMP]; /* see also: 6.5.1.1.5 and 6.6.1.1.5 */
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/* Algorithm parameters */
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int algo; /* Algorithm type (see gprs_sndcp_xid.h) */
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int compclass; /* See gprs_sndcp_xid.h/c */
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void *state; /* Algorithm status and parameters */
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};
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#define MAX_COMP 16 /* Maximum number of possible pcomp/dcomp values */
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#define MAX_NSAPI 11 /* Maximum number usable NSAPIs */
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/* Allocate a compression enitiy list */
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struct llist_head *gprs_sndcp_comp_alloc(const void *ctx);
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/* Free a compression entitiy list */
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void gprs_sndcp_comp_free(struct llist_head *comp_entities);
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/* Delete a compression entity */
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void gprs_sndcp_comp_delete(struct llist_head *comp_entities, unsigned int entity);
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/* Create and Add a new compression entity
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* (returns a pointer to the compression entity that has just been created) */
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struct gprs_sndcp_comp *gprs_sndcp_comp_add(const void *ctx,
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struct llist_head *comp_entities,
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const struct gprs_sndcp_comp_field
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*comp_field);
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/* Find which compression entity handles the specified pcomp/dcomp */
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struct gprs_sndcp_comp *gprs_sndcp_comp_by_comp(const struct llist_head
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*comp_entities, uint8_t comp);
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/* Find which compression entity handles the specified nsapi */
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struct gprs_sndcp_comp *gprs_sndcp_comp_by_nsapi(const struct llist_head
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*comp_entities, uint8_t nsapi);
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/* Find a comp_index for a given pcomp/dcomp value */
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uint8_t gprs_sndcp_comp_get_idx(const struct gprs_sndcp_comp *comp_entity,
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uint8_t comp);
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/* Find a pcomp/dcomp value for a given comp_index */
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uint8_t gprs_sndcp_comp_get_comp(const struct gprs_sndcp_comp *comp_entity,
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uint8_t comp_index);
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