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-rw-r--r--include/osmocom/sgsn/gprs_sndcp_pcomp.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/include/osmocom/sgsn/gprs_sndcp_pcomp.h b/include/osmocom/sgsn/gprs_sndcp_pcomp.h
new file mode 100644
index 00000000..3e3131b5
--- /dev/null
+++ b/include/osmocom/sgsn/gprs_sndcp_pcomp.h
@@ -0,0 +1,46 @@
+/* GPRS SNDCP header compression handler */
+
+/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/sgsn/gprs_sndcp_comp.h>
+
+/* Note: The decompressed packet may have a maximum size of:
+ * Return value + MAX_DECOMPR_INCR */
+#define MAX_HDRDECOMPR_INCR 64
+
+/* Initalize header compression */
+int gprs_sndcp_pcomp_init(const void *ctx, struct gprs_sndcp_comp *comp_entity,
+ const struct gprs_sndcp_comp_field *comp_field);
+
+/* Terminate header compression */
+void gprs_sndcp_pcomp_term(struct gprs_sndcp_comp *comp_entity);
+
+/* Expand packet header */
+int gprs_sndcp_pcomp_expand(uint8_t *data, unsigned int len, uint8_t pcomp,
+ const struct llist_head *comp_entities);
+
+/* Compress packet header */
+int gprs_sndcp_pcomp_compress(uint8_t *data, unsigned int len, uint8_t *pcomp,
+ const struct llist_head *comp_entities,
+ uint8_t nsapi);