FGFS-4.1/pyModeS
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Update ehs.py

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Additional checks BDS4,4
This commit is contained in:
Huy Vû 2017-10-24 13:02:08 +02:00 committed by GitHub
parent fbe5b63286
commit e8449154ca
1 changed files with 9 additions and 2 deletions
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11
pyModeS/ehs.py
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@ -325,13 +325,18 @@ def isBDS44(msg, rev=False):
result = result & checkbits(d, 5, 6, 23) \
& checkbits(d, 35, 36, 46) & checkbits(d, 47, 48, 49) \
& checkbits(d, 50, 51, 56)
# Bits 1-4 indicate source, values > 4 reserved and should not occur
if util.bin2int(d[0:4]) > 4:
result &= False
else:
# status bit 5, 15, 24, 36, 49
result = result & checkbits(d, 5, 6, 14) \
& checkbits(d, 15, 16, 23) & checkbits(d, 24, 25, 35) \
& checkbits(d, 36, 37, 47) & checkbits(d, 49, 50, 56)
# Bits 1-4 are reserved and should be zero
if util.bin2int(d[0:4]) != 0:
result &= False
if not result:
return False
@ -342,6 +347,8 @@ def isBDS44(msg, rev=False):
if temp44(msg):
if temp44(msg) > 60 or temp44(msg) < -80:
result &= False
elif temp44(msg) == 0:
result &= False
return result