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device: defense against missing devices

This commit is contained in:
Peter F. Patel-Schneider 2021-01-03 16:00:31 -05:00
parent f68a831c81
commit 111f2be5c8
1 changed files with 6 additions and 3 deletions
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9
lib/logitech_receiver/hidpp20.py
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@ -313,7 +313,7 @@ class FeaturesArray(object):
elif ivalue == int(f):
return True
if may_have:
if may_have and self.device:
reply = self.device.request(0x0000, _pack('!H', ivalue))
if reply:
index = ord(reply[0:1])
@ -1315,8 +1315,11 @@ def get_host_names(device):
remaining = nameLen
while remaining > 0:
name_piece = feature_request(device, FEATURE.HOSTS_INFO, 0x30, host, nameLen - remaining)
name += name_piece[2:2 + min(remaining, 14)].decode()
remaining = max(0, remaining - 14)
if name_piece:
name += name_piece[2:2 + min(remaining, 14)].decode()
remaining = max(0, remaining - 14)
else:
remaining = 0
host_names[host] = (bool(status), name)
return host_names