restructure, add BDS30

pyModeS/decoder/bds/bds17.py

@@ -0,0 +1,70 @@
+# Copyright (C) 2018 Junzi Sun (TU Delft)
+
+# 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 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 General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+from __future__ import absolute_import, print_function, division
+from pyModeS.decoder.util import hex2bin, bin2int
+from pyModeS.decoder.modes import data, allzeros
+
+# ------------------------------------------
+# BDS 1,7
+# Common usage GICB capability report
+# ------------------------------------------
+
+def isBDS17(msg):
+    """Check if a message is likely to be BDS code 1,7
+
+    Args:
+        msg (String): 28 bytes hexadecimal message string
+
+    Returns:
+        bool: True or False
+    """
+
+    if allzeros(msg):
+        return False
+
+    d = hex2bin(data(msg))
+
+    if bin2int(d[28:56]) != 0:
+        return False
+
+    caps = cap17(msg)
+
+    # basic BDS codes for ADS-B shall be supported
+    #   assuming ADS-B out is installed (2017EU/2020US mandate)
+    if not set(['BDS05', 'BDS06', 'BDS09', 'BDS20']).issubset(caps):
+        return False
+
+    return True
+
+def cap17(msg):
+    """Extract capacities from BDS 1,7 message
+
+    Args:
+        msg (String): 28 bytes hexadecimal message string
+
+    Returns:
+        list: list of suport BDS codes
+    """
+    allbds = ['05', '06', '07', '08', '09', '0A', '20', '21', '40', '41',
+              '42', '43', '44', '45', '48', '50', '51', '52', '53', '54',
+              '55', '56', '5F', '60', 'NA', 'NA', 'E1', 'E2']
+
+    d = hex2bin(data(msg))
+    idx = [i for i, v in enumerate(d[:28]) if v=='1']
+    capacity = ['BDS'+allbds[i] for i in idx if allbds[i] is not 'NA']
+
+    return capacity