tree 73aaa9c1141a2e7425e92cb0ff660e0afcf7331e
parent 11df4f6906edc0dfb23089a6e297158549c19ebd
author William A. Kennington III <wak@google.com> 1554780446 -0700
committer William A. Kennington III <wak@google.com> 1555033225 -0700

message/unpack: Fix undefined behavior

It's UB to shift an integer by the size of that integer. More
specifically, if you disable compiler optimization and try and unpack a
32 bit bitset you will end up with a 0x0 mask. Avoid UB by replacing
shift subtract with a negate shift.

Tested:
    Unit tests pass now.

Change-Id: I03a6f866a51c955b57787d641da9180841747e4c
Signed-off-by: William A. Kennington III <wak@google.com>