47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* GPRS SNDCP header compression handler */
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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_comp.h>
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/* Note: The decompressed packet may have a maximum size of:
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* Return value + MAX_DECOMPR_INCR */
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#define MAX_HDRDECOMPR_INCR 64
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/* Initalize header compression */
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int gprs_sndcp_pcomp_init(const void *ctx, struct gprs_sndcp_comp *comp_entity,
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const struct gprs_sndcp_comp_field *comp_field);
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/* Terminate header compression */
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void gprs_sndcp_pcomp_term(struct gprs_sndcp_comp *comp_entity);
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/* Expand packet header */
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int gprs_sndcp_pcomp_expand(uint8_t *data, unsigned int len, uint8_t pcomp,
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const struct llist_head *comp_entities);
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/* Compress packet header */
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int gprs_sndcp_pcomp_compress(uint8_t *data, unsigned int len, uint8_t *pcomp,
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const struct llist_head *comp_entities,
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uint8_t nsapi);
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