pdch/tbf: Move gprs_rlcmac_rcv_data_block_acknowledged into the pdch
Move the method into the PDCH. Extract the finding of TLLI into a
new class called Decoding. Move the assemble and forward LLC frames
into the TBF as it is poking in the internals of the TBF.
diff --git a/src/decoding.cpp b/src/decoding.cpp
new file mode 100644
index 0000000..596b66e
--- /dev/null
+++ b/src/decoding.cpp
@@ -0,0 +1,70 @@
+/* decoding
+ *
+ * Copyright (C) 2012 Ivan Klyuchnikov
+ * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * 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 <decoding.h>
+#include <rlc.h>
+#include <gprs_debug.h>
+
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <string.h>
+
+
+int Decoding::tlli_from_ul_data(const uint8_t *data, uint8_t len,
+ uint32_t *tlli)
+{
+ struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
+ struct rlc_li_field *li;
+ uint8_t e;
+ uint32_t _tlli;
+
+ if (!rh->ti)
+ return -EINVAL;
+
+ data += 3;
+ len -= 3;
+ e = rh->e;
+ /* if E is not set (LI follows) */
+ while (!e) {
+ if (!len) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, "
+ "but no more data\n");
+ return -EINVAL;
+ }
+ /* get new E */
+ li = (struct rlc_li_field *)data;
+ if (li->e == 0) /* if LI==0, E is interpreted as '1' */
+ e = 1;
+ else
+ e = li->e;
+ data++;
+ len--;
+ }
+ if (len < 4) {
+ LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame "
+ "border\n");
+ return -EINVAL;
+ }
+ memcpy(&_tlli, data, 4);
+ *tlli = ntohl(_tlli);
+
+ return 0;
+}
+