tlv8 int parsing fixes#10
Conversation
this fixes undefined c behaviour when paring uint64_t, int64_t (e.g. 255 << 32 has insufficient space as it is done on (u)int32) and also on int32_t (255 << 24 is undefined) see e.g. https://stackoverflow.com/questions/11644362/are-the-results-of-bitwise-operations-on-signed-integers-defined
|
hm, this should be reported upstream - https://github.com/Apple/HomeKitADK/ |
|
Yeah will do. This bugged me a lot until I found it… |
|
I looked into it more I guess it is only in C++ see https://stackoverflow.com/questions/3784996/why-does-left-shift-operation-invoke-undefined-behaviour-when-the-left-side-oper |
|
wow, that's subtle. your PR looks good but let's give them some time to respond. if at all possible i'd rather it be merged upstream and we update our copy, to minimize divergence. |
|
The issue has been sitting there for some time now, I don't think anyone at Apple is currently interested in HomeKit... probably all working on matter |
|
@rojer It looks like https://github.com/Apple/HomeKitADK/ is dead, PR is open since 3/4 year and no code changes since 1 1/2 years. So it would be cool to get it merged. Shelly HomeKit already using this change and it works nicely. |
|
ok, fair enough, merging |
|
upstream approved 🤣 since 8 mo |
4 participants
this fixes undefined c behaviour when paring uint64_t, int64_t
(e.g. 255 << 32 has insufficient space as it is done on (u)int32)
and also on int32_t (255 << 24 is undefined)
see e.g. https://stackoverflow.com/questions/11644362/are-the-results-of-bitwise-operations-on-signed-integers-defined