The cross-process block's layout is a wire protocol shared by the x64 host and the
x86 hook, but only three front offsets were asserted, and hook_selftest's
dump_layout merely printed the rest. A field reordered/resized inside HookStatus
(which precedes control/video/mkb) would silently shift everything with no
compile-time tripwire and, if the developer forgot to bump kProtocolVersion, ship
a silent host<->DLL mismatch.
- protocol.hpp now static_asserts sizeof(SharedBlock) and every sub-channel offset
(status/control/video/mkb) plus each sub-struct size (HookStatus/HookControl/
VideoShare/AudioStreamInfo/HookEntry/MkbRing). protocol.hpp is compiled for both
arches, so a cross-bitness divergence fails to compile on the one that disagrees.
- hook_selftest's dump_layout now ASSERTS the same numbers instead of only
printing, so hook_selftest_x86 confirms the x86 layout at runtime too.
Verified: x64 and x86 builds both compile (identical layout) and both selftests
pass; sizeof(SharedBlock)=3936 on both.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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