import GSM04.08 encode/decode functions and mncc.h from openbsc
diff --git a/src/gsm48_ie.c b/src/gsm48_ie.c
new file mode 100644
index 0000000..4ca5fb8
--- /dev/null
+++ b/src/gsm48_ie.c
@@ -0,0 +1,659 @@
+/* GSM Mobile Radio Interface Layer 3 messages
+ * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
+
+/* (C) 2008 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2008-2010 by Andreas Eversberg
+ *
+ * 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.
+ *
+ */
+
+
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+
+#include <osmocore/utils.h>
+#include <osmocore/msgb.h>
+#include <osmocore/tlv.h>
+#include <osmocore/mncc.h>
+#include <osmocore/protocol/gsm_04_08.h>
+
+static const char bcd_num_digits[] = {
+ '0', '1', '2', '3', '4', '5', '6', '7',
+ '8', '9', '*', '#', 'a', 'b', 'c', '\0'
+};
+
+/* decode a 'called/calling/connect party BCD number' as in 10.5.4.7 */
+int gsm48_decode_bcd_number(char *output, int output_len,
+ const uint8_t *bcd_lv, int h_len)
+{
+ uint8_t in_len = bcd_lv[0];
+ int i;
+
+ for (i = 1 + h_len; i <= in_len; i++) {
+ /* lower nibble */
+ output_len--;
+ if (output_len <= 1)
+ break;
+ *output++ = bcd_num_digits[bcd_lv[i] & 0xf];
+
+ /* higher nibble */
+ output_len--;
+ if (output_len <= 1)
+ break;
+ *output++ = bcd_num_digits[bcd_lv[i] >> 4];
+ }
+ if (output_len >= 1)
+ *output++ = '\0';
+
+ return 0;
+}
+
+/* convert a single ASCII character to call-control BCD */
+static int asc_to_bcd(const char asc)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(bcd_num_digits); i++) {
+ if (bcd_num_digits[i] == asc)
+ return i;
+ }
+ return -EINVAL;
+}
+
+/* convert a ASCII phone number to 'called/calling/connect party BCD number' */
+int gsm48_encode_bcd_number(uint8_t *bcd_lv, uint8_t max_len,
+ int h_len, const char *input)
+{
+ int in_len = strlen(input);
+ int i;
+ uint8_t *bcd_cur = bcd_lv + 1 + h_len;
+
+ /* two digits per byte, plus type byte */
+ bcd_lv[0] = in_len/2 + h_len;
+ if (in_len % 2)
+ bcd_lv[0]++;
+
+ if (bcd_lv[0] > max_len)
+ return -EIO;
+
+ for (i = 0; i < in_len; i++) {
+ int rc = asc_to_bcd(input[i]);
+ if (rc < 0)
+ return rc;
+ if (i % 2 == 0)
+ *bcd_cur = rc;
+ else
+ *bcd_cur++ |= (rc << 4);
+ }
+ /* append padding nibble in case of odd length */
+ if (i % 2)
+ *bcd_cur++ |= 0xf0;
+
+ /* return how many bytes we used */
+ return (bcd_cur - bcd_lv);
+}
+
+/* decode 'bearer capability' */
+int gsm48_decode_bearer_cap(struct gsm_mncc_bearer_cap *bcap,
+ const uint8_t *lv)
+{
+ uint8_t in_len = lv[0];
+ int i, s;
+
+ if (in_len < 1)
+ return -EINVAL;
+
+ bcap->speech_ver[0] = -1; /* end of list, of maximum 7 values */
+
+ /* octet 3 */
+ bcap->transfer = lv[1] & 0x07;
+ bcap->mode = (lv[1] & 0x08) >> 3;
+ bcap->coding = (lv[1] & 0x10) >> 4;
+ bcap->radio = (lv[1] & 0x60) >> 5;
+
+ if (bcap->transfer == GSM_MNCC_BCAP_SPEECH) {
+ i = 1;
+ s = 0;
+ while(!(lv[i] & 0x80)) {
+ i++; /* octet 3a etc */
+ if (in_len < i)
+ return 0;
+ bcap->speech_ver[s++] = lv[i] & 0x0f;
+ bcap->speech_ver[s] = -1; /* end of list */
+ if (i == 2) /* octet 3a */
+ bcap->speech_ctm = (lv[i] & 0x20) >> 5;
+ if (s == 7) /* maximum speech versions + end of list */
+ return 0;
+ }
+ } else {
+ i = 1;
+ while (!(lv[i] & 0x80)) {
+ i++; /* octet 3a etc */
+ if (in_len < i)
+ return 0;
+ /* ignore them */
+ }
+ /* FIXME: implement OCTET 4+ parsing */
+ }
+
+ return 0;
+}
+
+/* encode 'bearer capability' */
+int gsm48_encode_bearer_cap(struct msgb *msg, int lv_only,
+ const struct gsm_mncc_bearer_cap *bcap)
+{
+ uint8_t lv[32 + 1];
+ int i = 1, s;
+
+ lv[1] = bcap->transfer;
+ lv[1] |= bcap->mode << 3;
+ lv[1] |= bcap->coding << 4;
+ lv[1] |= bcap->radio << 5;
+
+ if (bcap->transfer == GSM_MNCC_BCAP_SPEECH) {
+ for (s = 0; bcap->speech_ver[s] >= 0; s++) {
+ i++; /* octet 3a etc */
+ lv[i] = bcap->speech_ver[s];
+ if (i == 2) /* octet 3a */
+ lv[i] |= bcap->speech_ctm << 5;
+ }
+ lv[i] |= 0x80; /* last IE of octet 3 etc */
+ } else {
+ /* FIXME: implement OCTET 4+ encoding */
+ }
+
+ lv[0] = i;
+ if (lv_only)
+ msgb_lv_put(msg, lv[0], lv+1);
+ else
+ msgb_tlv_put(msg, GSM48_IE_BEARER_CAP, lv[0], lv+1);
+
+ return 0;
+}
+
+/* decode 'call control cap' */
+int gsm48_decode_cccap(struct gsm_mncc_cccap *ccap, const uint8_t *lv)
+{
+ uint8_t in_len = lv[0];
+
+ if (in_len < 1)
+ return -EINVAL;
+
+ /* octet 3 */
+ ccap->dtmf = lv[1] & 0x01;
+ ccap->pcp = (lv[1] & 0x02) >> 1;
+
+ return 0;
+}
+
+/* encode 'call control cap' */
+int gsm48_encode_cccap(struct msgb *msg,
+ const struct gsm_mncc_cccap *ccap)
+{
+ uint8_t lv[2];
+
+ lv[0] = 1;
+ lv[1] = 0;
+ if (ccap->dtmf)
+ lv [1] |= 0x01;
+ if (ccap->pcp)
+ lv [1] |= 0x02;
+
+ msgb_tlv_put(msg, GSM48_IE_CC_CAP, lv[0], lv+1);
+
+ return 0;
+}
+
+/* decode 'called party BCD number' */
+int gsm48_decode_called(struct gsm_mncc_number *called,
+ const uint8_t *lv)
+{
+ uint8_t in_len = lv[0];
+
+ if (in_len < 1)
+ return -EINVAL;
+
+ /* octet 3 */
+ called->plan = lv[1] & 0x0f;
+ called->type = (lv[1] & 0x70) >> 4;
+
+ /* octet 4..N */
+ gsm48_decode_bcd_number(called->number, sizeof(called->number), lv, 1);
+
+ return 0;
+}
+
+/* encode 'called party BCD number' */
+int gsm48_encode_called(struct msgb *msg,
+ const struct gsm_mncc_number *called)
+{
+ uint8_t lv[18];
+ int ret;
+
+ /* octet 3 */
+ lv[1] = called->plan;
+ lv[1] |= called->type << 4;
+
+ /* octet 4..N, octet 2 */
+ ret = gsm48_encode_bcd_number(lv, sizeof(lv), 1, called->number);
+ if (ret < 0)
+ return ret;
+
+ msgb_tlv_put(msg, GSM48_IE_CALLED_BCD, lv[0], lv+1);
+
+ return 0;
+}
+
+/* decode callerid of various IEs */
+int gsm48_decode_callerid(struct gsm_mncc_number *callerid,
+ const uint8_t *lv)
+{
+ uint8_t in_len = lv[0];
+ int i = 1;
+
+ if (in_len < 1)
+ return -EINVAL;
+
+ /* octet 3 */
+ callerid->plan = lv[1] & 0x0f;
+ callerid->type = (lv[1] & 0x70) >> 4;
+
+ /* octet 3a */
+ if (!(lv[1] & 0x80)) {
+ callerid->screen = lv[2] & 0x03;
+ callerid->present = (lv[2] & 0x60) >> 5;
+ i = 2;
+ }
+
+ /* octet 4..N */
+ gsm48_decode_bcd_number(callerid->number, sizeof(callerid->number), lv, i);
+
+ return 0;
+}
+
+/* encode callerid of various IEs */
+int gsm48_encode_callerid(struct msgb *msg, int ie, int max_len,
+ const struct gsm_mncc_number *callerid)
+{
+ uint8_t lv[max_len - 1];
+ int h_len = 1;
+ int ret;
+
+ /* octet 3 */
+ lv[1] = callerid->plan;
+ lv[1] |= callerid->type << 4;
+
+ if (callerid->present || callerid->screen) {
+ /* octet 3a */
+ lv[2] = callerid->screen;
+ lv[2] |= callerid->present << 5;
+ lv[2] |= 0x80;
+ h_len++;
+ } else
+ lv[1] |= 0x80;
+
+ /* octet 4..N, octet 2 */
+ ret = gsm48_encode_bcd_number(lv, sizeof(lv), h_len, callerid->number);
+ if (ret < 0)
+ return ret;
+
+ msgb_tlv_put(msg, ie, lv[0], lv+1);
+
+ return 0;
+}
+
+/* decode 'cause' */
+int gsm48_decode_cause(struct gsm_mncc_cause *cause,
+ const uint8_t *lv)
+{
+ uint8_t in_len = lv[0];
+ int i;
+
+ if (in_len < 2)
+ return -EINVAL;
+
+ cause->diag_len = 0;
+
+ /* octet 3 */
+ cause->location = lv[1] & 0x0f;
+ cause->coding = (lv[1] & 0x60) >> 5;
+
+ i = 1;
+ if (!(lv[i] & 0x80)) {
+ i++; /* octet 3a */
+ if (in_len < i+1)
+ return 0;
+ cause->rec = 1;
+ cause->rec_val = lv[i] & 0x7f;
+ }
+ i++;
+
+ /* octet 4 */
+ cause->value = lv[i] & 0x7f;
+ i++;
+
+ if (in_len < i) /* no diag */
+ return 0;
+
+ if (in_len - (i-1) > 32) /* maximum 32 octets */
+ return 0;
+
+ /* octet 5-N */
+ memcpy(cause->diag, lv + i, in_len - (i-1));
+ cause->diag_len = in_len - (i-1);
+
+ return 0;
+}
+
+/* encode 'cause' */
+int gsm48_encode_cause(struct msgb *msg, int lv_only,
+ const struct gsm_mncc_cause *cause)
+{
+ uint8_t lv[32+4];
+ int i;
+
+ if (cause->diag_len > 32)
+ return -EINVAL;
+
+ /* octet 3 */
+ lv[1] = cause->location;
+ lv[1] |= cause->coding << 5;
+
+ i = 1;
+ if (cause->rec) {
+ i++; /* octet 3a */
+ lv[i] = cause->rec_val;
+ }
+ lv[i] |= 0x80; /* end of octet 3 */
+
+ /* octet 4 */
+ i++;
+ lv[i] = 0x80 | cause->value;
+
+ /* octet 5-N */
+ if (cause->diag_len) {
+ memcpy(lv + i, cause->diag, cause->diag_len);
+ i += cause->diag_len;
+ }
+
+ lv[0] = i;
+ if (lv_only)
+ msgb_lv_put(msg, lv[0], lv+1);
+ else
+ msgb_tlv_put(msg, GSM48_IE_CAUSE, lv[0], lv+1);
+
+ return 0;
+}
+
+/* decode 'calling number' */
+int gsm48_decode_calling(struct gsm_mncc_number *calling,
+ const uint8_t *lv)
+{
+ return gsm48_decode_callerid(calling, lv);
+}
+
+/* encode 'calling number' */
+int gsm48_encode_calling(struct msgb *msg,
+ const struct gsm_mncc_number *calling)
+{
+ return gsm48_encode_callerid(msg, GSM48_IE_CALLING_BCD, 14, calling);
+}
+
+/* decode 'connected number' */
+int gsm48_decode_connected(struct gsm_mncc_number *connected,
+ const uint8_t *lv)
+{
+ return gsm48_decode_callerid(connected, lv);
+}
+
+/* encode 'connected number' */
+int gsm48_encode_connected(struct msgb *msg,
+ const struct gsm_mncc_number *connected)
+{
+ return gsm48_encode_callerid(msg, GSM48_IE_CONN_BCD, 14, connected);
+}
+
+/* decode 'redirecting number' */
+int gsm48_decode_redirecting(struct gsm_mncc_number *redirecting,
+ const uint8_t *lv)
+{
+ return gsm48_decode_callerid(redirecting, lv);
+}
+
+/* encode 'redirecting number' */
+int gsm48_encode_redirecting(struct msgb *msg,
+ const struct gsm_mncc_number *redirecting)
+{
+ return gsm48_encode_callerid(msg, GSM48_IE_REDIR_BCD, 19, redirecting);
+}
+
+/* decode 'facility' */
+int gsm48_decode_facility(struct gsm_mncc_facility *facility,
+ const uint8_t *lv)
+{
+ uint8_t in_len = lv[0];
+
+ if (in_len < 1)
+ return -EINVAL;
+
+ if (in_len > sizeof(facility->info))
+ return -EINVAL;
+
+ memcpy(facility->info, lv+1, in_len);
+ facility->len = in_len;
+
+ return 0;
+}
+
+/* encode 'facility' */
+int gsm48_encode_facility(struct msgb *msg, int lv_only,
+ const struct gsm_mncc_facility *facility)
+{
+ uint8_t lv[GSM_MAX_FACILITY + 1];
+
+ if (facility->len < 1 || facility->len > GSM_MAX_FACILITY)
+ return -EINVAL;
+
+ memcpy(lv+1, facility->info, facility->len);
+ lv[0] = facility->len;
+ if (lv_only)
+ msgb_lv_put(msg, lv[0], lv+1);
+ else
+ msgb_tlv_put(msg, GSM48_IE_FACILITY, lv[0], lv+1);
+
+ return 0;
+}
+
+/* decode 'notify' */
+int gsm48_decode_notify(int *notify, const uint8_t *v)
+{
+ *notify = v[0] & 0x7f;
+
+ return 0;
+}
+
+/* encode 'notify' */
+int gsm48_encode_notify(struct msgb *msg, int notify)
+{
+ msgb_v_put(msg, notify | 0x80);
+
+ return 0;
+}
+
+/* decode 'signal' */
+int gsm48_decode_signal(int *signal, const uint8_t *v)
+{
+ *signal = v[0];
+
+ return 0;
+}
+
+/* encode 'signal' */
+int gsm48_encode_signal(struct msgb *msg, int signal)
+{
+ msgb_tv_put(msg, GSM48_IE_SIGNAL, signal);
+
+ return 0;
+}
+
+/* decode 'keypad' */
+int gsm48_decode_keypad(int *keypad, const uint8_t *lv)
+{
+ uint8_t in_len = lv[0];
+
+ if (in_len < 1)
+ return -EINVAL;
+
+ *keypad = lv[1] & 0x7f;
+
+ return 0;
+}
+
+/* encode 'keypad' */
+int gsm48_encode_keypad(struct msgb *msg, int keypad)
+{
+ msgb_tv_put(msg, GSM48_IE_KPD_FACILITY, keypad);
+
+ return 0;
+}
+
+/* decode 'progress' */
+int gsm48_decode_progress(struct gsm_mncc_progress *progress,
+ const uint8_t *lv)
+{
+ uint8_t in_len = lv[0];
+
+ if (in_len < 2)
+ return -EINVAL;
+
+ progress->coding = (lv[1] & 0x60) >> 5;
+ progress->location = lv[1] & 0x0f;
+ progress->descr = lv[2] & 0x7f;
+
+ return 0;
+}
+
+/* encode 'progress' */
+int gsm48_encode_progress(struct msgb *msg, int lv_only,
+ const struct gsm_mncc_progress *p)
+{
+ uint8_t lv[3];
+
+ lv[0] = 2;
+ lv[1] = 0x80 | ((p->coding & 0x3) << 5) | (p->location & 0xf);
+ lv[2] = 0x80 | (p->descr & 0x7f);
+ if (lv_only)
+ msgb_lv_put(msg, lv[0], lv+1);
+ else
+ msgb_tlv_put(msg, GSM48_IE_PROGR_IND, lv[0], lv+1);
+
+ return 0;
+}
+
+/* decode 'user-user' */
+int gsm48_decode_useruser(struct gsm_mncc_useruser *uu,
+ const uint8_t *lv)
+{
+ uint8_t in_len = lv[0];
+ char *info = uu->info;
+ int info_len = sizeof(uu->info);
+ int i;
+
+ if (in_len < 1)
+ return -EINVAL;
+
+ uu->proto = lv[1];
+
+ for (i = 2; i <= in_len; i++) {
+ info_len--;
+ if (info_len <= 1)
+ break;
+ *info++ = lv[i];
+ }
+ if (info_len >= 1)
+ *info++ = '\0';
+
+ return 0;
+}
+
+/* encode 'useruser' */
+int gsm48_encode_useruser(struct msgb *msg, int lv_only,
+ const struct gsm_mncc_useruser *uu)
+{
+ uint8_t lv[GSM_MAX_USERUSER + 2];
+
+ if (strlen(uu->info) > GSM_MAX_USERUSER)
+ return -EINVAL;
+
+ lv[0] = 1 + strlen(uu->info);
+ lv[1] = uu->proto;
+ memcpy(lv + 2, uu->info, strlen(uu->info));
+ if (lv_only)
+ msgb_lv_put(msg, lv[0], lv+1);
+ else
+ msgb_tlv_put(msg, GSM48_IE_USER_USER, lv[0], lv+1);
+
+ return 0;
+}
+
+/* decode 'ss version' */
+int gsm48_decode_ssversion(struct gsm_mncc_ssversion *ssv,
+ const uint8_t *lv)
+{
+ uint8_t in_len = lv[0];
+
+ if (in_len < 1 || in_len < sizeof(ssv->info))
+ return -EINVAL;
+
+ memcpy(ssv->info, lv + 1, in_len);
+ ssv->len = in_len;
+
+ return 0;
+}
+
+/* encode 'ss version' */
+int gsm48_encode_ssversion(struct msgb *msg,
+ const struct gsm_mncc_ssversion *ssv)
+{
+ uint8_t lv[GSM_MAX_SSVERSION + 1];
+
+ if (ssv->len > GSM_MAX_SSVERSION)
+ return -EINVAL;
+
+ lv[0] = ssv->len;
+ memcpy(lv + 1, ssv->info, ssv->len);
+ msgb_tlv_put(msg, GSM48_IE_SS_VERS, lv[0], lv+1);
+
+ return 0;
+}
+
+/* decode 'more data' does not require a function, because it has no value */
+
+/* encode 'more data' */
+int gsm48_encode_more(struct msgb *msg)
+{
+ uint8_t *ie;
+
+ ie = msgb_put(msg, 1);
+ ie[0] = GSM48_IE_MORE_DATA;
+
+ return 0;
+}
+