dcf77: annotate invalid dow and month fields, do not abort execution

Emit error annotations for invalid day of the week or month numbers,
instead of aborting decoder execution with an exception.

Implementation detail: Neither the Python 'in' keyword nor a .get()
method are available. That's why we have to catch the IndexError
exception.

This fixes bug #1173.

diff --git a/decoders/dcf77/pd.py b/decoders/dcf77/pd.py
index 4789b66427b65afb01307e9be63676b6279d92ae..3a97d827734c71929cf245e6c4c2e7a325ebc8c7 100644 (file)
--- a/decoders/dcf77/pd.py
+++ b/decoders/dcf77/pd.py
@@ -210,9 +210,13 @@ class Decoder(srd.Decoder):
                 self.tmp |= (bit << (c - 42))
             if c == 44:
                 d = bcd2int(self.tmp)
-                dn = calendar.day_name[d - 1] # day_name[0] == Monday
-                self.putb([13, ['Day of week: %d (%s)' % (d, dn),
-                                'DoW: %d (%s)' % (d, dn)]])
+                try:
+                    dn = calendar.day_name[d - 1] # day_name[0] == Monday
+                    self.putb([13, ['Day of week: %d (%s)' % (d, dn),
+                                    'DoW: %d (%s)' % (d, dn)]])
+                except IndexError:
+                    self.putb([19, ['Day of week: %d (%s)' % (d, 'invalid'),
+                                    'DoW: %d (%s)' % (d, 'inv')]])
         elif c in range(45, 49 + 1):
             # Month (1-12): DCF77 bits 45-49 (BCD format).
             if c == 45:
@@ -222,9 +226,13 @@ class Decoder(srd.Decoder):
                 self.tmp |= (bit << (c - 45))
             if c == 49:
                 m = bcd2int(self.tmp)
-                mn = calendar.month_name[m] # month_name[1] == January
-                self.putb([14, ['Month: %d (%s)' % (m, mn),
-                                'Mon: %d (%s)' % (m, mn)]])
+                try:
+                    mn = calendar.month_name[m] # month_name[1] == January
+                    self.putb([14, ['Month: %d (%s)' % (m, mn),
+                                    'Mon: %d (%s)' % (m, mn)]])
+                except IndexError:
+                    self.putb([19, ['Month: %d (%s)' % (m, 'invalid'),
+                                    'Mon: %d (%s)' % (m, 'inv')]])
         elif c in range(50, 57 + 1):
             # Year (0-99): DCF77 bits 50-57 (BCD format).
             if c == 50: