Added functions for arfcn conversions taken from libosmocore
diff --git a/lib/decoding/osmocom/gsm/gsm_utils.h b/lib/decoding/osmocom/gsm/gsm_utils.h
new file mode 100644
index 0000000..2cd8832
--- /dev/null
+++ b/lib/decoding/osmocom/gsm/gsm_utils.h
@@ -0,0 +1,238 @@
+/*! \file gsm_utils.h
+ * GSM utility functions, e.g. coding and decoding. */
+/*
+ * (C) 2008 by Daniel Willmann <daniel@totalueberwachung.de>
+ * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <osmocom/core/defs.h>
+#include <osmocom/core/utils.h>
+
+#define ADD_MODULO(sum, delta, modulo) do { \
+ if ((sum += delta) >= modulo) \
+ sum -= modulo; \
+ } while (0)
+
+#define GSM_MAX_FN (26*51*2048)
+
+/* Max length of random identifier which can be requested via osmo_get_rand_id() */
+#define OSMO_MAX_RAND_ID_LEN 16
+
+//struct gsm_time {
+// uint32_t fn; /* FN count */
+// uint16_t t1; /* FN div (26*51) */
+// uint8_t t2; /* FN modulo 26 */
+// uint8_t t3; /* FN modulo 51 */
+// uint8_t tc;
+//};
+
+enum gsm_band {
+ GSM_BAND_850 = 1,
+ GSM_BAND_900 = 2,
+ GSM_BAND_1800 = 4,
+ GSM_BAND_1900 = 8,
+ GSM_BAND_450 = 0x10,
+ GSM_BAND_480 = 0x20,
+ GSM_BAND_750 = 0x40,
+ GSM_BAND_810 = 0x80,
+};
+
+const char *gsm_band_name(enum gsm_band band);
+enum gsm_band gsm_band_parse(const char *mhz);
+
+//int osmo_get_rand_id(uint8_t *out, size_t len);
+
+/*!
+ * Decode a sequence of GSM 03.38 encoded 7 bit characters.
+ *
+ * \param decoded The destination buffer for the decoded characters.
+ * \param n A maximum of n chars is written (incl. terminating \0).
+ * Requires n >= 1.
+ * \param user_data A pointer to the start of the packed 7bit character
+ * sequence.
+ * \param length The length of the input sequence in septets, for
+ * example pass octet_length*8/7.
+ *
+ * \returns the number of (8 bit) chars written excluding the terminating \0.
+ * This is the same like strlen(decoded).
+ */
+//int gsm_7bit_decode_n(char *decoded, size_t n, const uint8_t *user_data, uint8_t length);
+
+///*!
+// * Decode a sequence of 7 bit characters (USSD encoding).
+// *
+// * \see gsm_7bit_encode_n()
+// */
+//int gsm_7bit_decode_n_ussd(char *decoded, size_t n, const uint8_t *user_data, uint8_t length);
+
+///*!
+// * Encode a text string into GSM 03.38 encoded 7 bit characters.
+// *
+// * \param result The destination buffer for the packed 7 bit sequence.
+// * \param n A maximum of n octets is written.
+// * \param data A pointer to the start of the \0 terminated 8 bit character
+// * string.
+// * \param octets_written Iff not NULL, *octets_written will be set to the
+// * number of octets written to the result buffer.
+// *
+// * \returns the number of septets that have been created.
+// */
+//int gsm_7bit_encode_n(uint8_t *result, size_t n, const char *data, int *octets_written);
+
+///*!
+// * Encode a text string into GSM 03.38 encoded 7 bit characters (USSD encoding).
+// *
+// * \see gsm_7bit_decode_n()
+// */
+//int gsm_7bit_encode_n_ussd(uint8_t *result, size_t n, const char *data, int *octets_written);
+
+///* the four functions below are helper functions and here for the unit test */
+//int gsm_septets2octets(uint8_t *result, const uint8_t *rdata, uint8_t septet_len, uint8_t padding);
+//int gsm_septet_encode(uint8_t *result, const char *data);
+//uint8_t gsm_get_octet_len(const uint8_t sept_len);
+//int gsm_7bit_decode_n_hdr(char *decoded, size_t n, const uint8_t *user_data, uint8_t length, uint8_t ud_hdr_ind);
+
+//unsigned int ms_class_gmsk_dbm(enum gsm_band band, int ms_class);
+
+//int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm);
+//int ms_pwr_dbm(enum gsm_band band, uint8_t lvl);
+
+///* According to TS 05.08 Chapter 8.1.4 */
+//int rxlev2dbm(uint8_t rxlev);
+//uint8_t dbm2rxlev(int dbm);
+
+///* According to GSM 04.08 Chapter 10.5.1.6 */
+//static inline int ms_cm2_a5n_support(uint8_t *cm2, unsigned n) {
+// switch (n) {
+// case 0: return 1;
+// case 1: return (cm2[0] & (1<<3)) ? 0 : 1;
+// case 2: return (cm2[2] & (1<<0)) ? 1 : 0;
+// case 3: return (cm2[2] & (1<<1)) ? 1 : 0;
+// default:
+// return 0;
+// }
+//}
+
+///* According to GSM 04.08 Chapter 10.5.1.7 */
+//static inline int ms_cm3_a5n_support(uint8_t *cm3, unsigned n) {
+// switch (n) {
+// case 4: return (cm3[0] & (1<<0)) ? 1 : 0;
+// case 5: return (cm3[0] & (1<<1)) ? 1 : 0;
+// case 6: return (cm3[0] & (1<<2)) ? 1 : 0;
+// case 7: return (cm3[0] & (1<<3)) ? 1 : 0;
+// default:
+// return 0;
+// }
+//}
+
+///* According to GSM 04.08 Chapter 10.5.2.29 */
+//static inline int rach_max_trans_val2raw(int val) { return (val >> 1) & 3; }
+//static inline int rach_max_trans_raw2val(int raw) {
+// const int tbl[4] = { 1, 2, 4, 7 };
+// return tbl[raw & 3];
+//}
+
+#define ARFCN_PCS 0x8000
+#define ARFCN_UPLINK 0x4000
+#define ARFCN_FLAG_MASK 0xf000 /* Reserve the upper 5 bits for flags */
+
+enum gsm_band gsm_arfcn2band(uint16_t arfcn);
+
+/* Convert an ARFCN to the frequency in MHz * 10 */
+uint16_t gsm_arfcn2freq10(uint16_t arfcn, int uplink);
+
+/* Convert a Frequency in MHz * 10 to ARFCN */
+uint16_t gsm_freq102arfcn(uint16_t freq10, int uplink);
+
+/* Convert from frame number to GSM time */
+//void gsm_fn2gsmtime(struct gsm_time *time, uint32_t fn);
+
+/* Parse GSM Frame Number into printable string */
+//char *gsm_fn_as_gsmtime_str(uint32_t fn);
+
+/* Convert from GSM time to frame number */
+//uint32_t gsm_gsmtime2fn(struct gsm_time *time);
+
+/* Returns static buffer with string representation of a GSM Time */
+//char *osmo_dump_gsmtime(const struct gsm_time *tm);
+
+/* GSM TS 03.03 Chapter 2.6 */
+//enum gprs_tlli_type {
+// TLLI_LOCAL,
+// TLLI_FOREIGN,
+// TLLI_RANDOM,
+// TLLI_AUXILIARY,
+// TLLI_RESERVED,
+// TLLI_G_RNTI,
+// TLLI_RAND_G_RNTI,
+//};
+
+/* TS 03.03 Chapter 2.6 */
+//int gprs_tlli_type(uint32_t tlli);
+
+//uint32_t gprs_tmsi2tlli(uint32_t p_tmsi, enum gprs_tlli_type type);
+
+///* Osmocom internal, not part of any gsm spec */
+//enum gsm_phys_chan_config {
+// GSM_PCHAN_NONE,
+// GSM_PCHAN_CCCH,
+// GSM_PCHAN_CCCH_SDCCH4,
+// GSM_PCHAN_TCH_F,
+// GSM_PCHAN_TCH_H,
+// GSM_PCHAN_SDCCH8_SACCH8C,
+// GSM_PCHAN_PDCH, /* GPRS PDCH */
+// GSM_PCHAN_TCH_F_PDCH, /* TCH/F if used, PDCH otherwise */
+// GSM_PCHAN_UNKNOWN,
+// GSM_PCHAN_CCCH_SDCCH4_CBCH,
+// GSM_PCHAN_SDCCH8_SACCH8C_CBCH,
+// GSM_PCHAN_TCH_F_TCH_H_PDCH,
+// _GSM_PCHAN_MAX
+//};
+
+///* Osmocom internal, not part of any gsm spec */
+//enum gsm_chan_t {
+// GSM_LCHAN_NONE,
+// GSM_LCHAN_SDCCH,
+// GSM_LCHAN_TCH_F,
+// GSM_LCHAN_TCH_H,
+// GSM_LCHAN_UNKNOWN,
+// GSM_LCHAN_CCCH,
+// GSM_LCHAN_PDTCH,
+// GSM_LCHAN_CBCH,
+// _GSM_LCHAN_MAX
+//};
+
+//extern const struct value_string gsm_chan_t_names[];
+
+///* Deprectated functions */
+///* Limit encoding and decoding to use no more than this amount of buffer bytes */
+//#define GSM_7BIT_LEGACY_MAX_BUFFER_SIZE 0x10000
+
+//int gsm_7bit_decode(char *decoded, const uint8_t *user_data, uint8_t length) OSMO_DEPRECATED("Use gsm_7bit_decode_n() instead");
+//int gsm_7bit_decode_ussd(char *decoded, const uint8_t *user_data, uint8_t length) OSMO_DEPRECATED("Use gsm_7bit_decode_n_ussd() instead");
+//int gsm_7bit_encode(uint8_t *result, const char *data) OSMO_DEPRECATED("Use gsm_7bit_encode_n() instead");
+//int gsm_7bit_encode_ussd(uint8_t *result, const char *data, int *octets_written) OSMO_DEPRECATED("Use gsm_7bit_encode_n_ussd() instead");
+//int gsm_7bit_encode_oct(uint8_t *result, const char *data, int *octets_written) OSMO_DEPRECATED("Use gsm_7bit_encode_n() instead");