1 files changed, 65 insertions, 0 deletions
diff --git a/src/coding_scheme.c b/src/coding_scheme.c
new file mode 100644
index 00000000..a6f2905c
--- /dev/null
+++ b/src/coding_scheme.c
@@ -0,0 +1,65 @@
+/* coding_scheme.c
+ *
+ * Copyright (C) 2019 by sysmocom s.f.m.c. GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <osmocom/core/utils.h>
+
+#include "coding_scheme.h"
+
+static struct {
+	struct {
+		uint8_t data_header_bits;
+	} uplink, downlink;
+	uint8_t data_block_header_bits;
+	uint8_t num_blocks;
+	const char *name;
+} hdr_type_info[NUM_HEADER_TYPES] = {
+	{ { 0 },         { 0 },         0, 0, "INVALID" },
+	{ { 1 * 8 + 0 }, { 1 * 8 + 0 }, 0, 0, "CONTROL" },
+	{ { 3 * 8 + 0 }, { 3 * 8 + 0 }, 0, 1, "GPRS_DATA" },
+	{ { 5 * 8 + 6 }, { 5 * 8 + 0 }, 2, 2, "EGPRS_DATA_TYPE1" },
+	{ { 4 * 8 + 5 }, { 3 * 8 + 4 }, 2, 1, "EGPRS_DATA_TYPE2" },
+	{ { 3 * 8 + 7 }, { 3 * 8 + 7 }, 2, 1, "EGPRS_DATA_TYPE3" },
+};
+
+uint8_t num_data_blocks(enum HeaderType ht)
+{
+	OSMO_ASSERT(ht < NUM_HEADER_TYPES);
+	return hdr_type_info[ht].num_blocks;
+}
+
+uint8_t num_data_header_bits_UL(enum HeaderType ht)
+{
+	OSMO_ASSERT(ht < NUM_HEADER_TYPES);
+	return hdr_type_info[ht].uplink.data_header_bits;
+}
+
+uint8_t num_data_header_bits_DL(enum HeaderType ht)
+{
+	OSMO_ASSERT(ht < NUM_HEADER_TYPES);
+	return hdr_type_info[ht].downlink.data_header_bits;
+}
+
+uint8_t num_data_block_header_bits(enum HeaderType ht)
+{
+	OSMO_ASSERT(ht < NUM_HEADER_TYPES);
+	return hdr_type_info[ht].data_block_header_bits;
+}