splink/source/win32/win32_app_code.c

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2023-09-30 01:09:40 +00:00
typedef struct W32_AppCode W32_AppCode;
struct W32_AppCode
{
ApplicationPermanentLoadCallback *PermanentLoad;
ApplicationHotLoadCallback *HotLoad;
ApplicationHotUnloadCallback *HotUnload;
ApplicationUpdateCallback *Update;
HMODULE dll;
FILETIME last_dll_write_time;
};
internal b32
W32_AppCodeLoad(W32_AppCode *app_code)
{
b32 result = 1;
CopyFile(global_app_dll_path, global_temp_app_dll_path, FALSE);
app_code->dll = LoadLibraryA(global_temp_app_dll_path);
app_code->last_dll_write_time = W32_GetLastWriteTime(global_app_dll_path);
if(!app_code->dll)
{
result = 0;
goto end;
}
app_code->PermanentLoad = (void *)GetProcAddress(app_code->dll, "PermanentLoad");
app_code->HotLoad = (void *)GetProcAddress(app_code->dll, "HotLoad");
app_code->HotUnload = (void *)GetProcAddress(app_code->dll, "HotUnload");
app_code->Update = (void *)GetProcAddress(app_code->dll, "Update");
if(!app_code->PermanentLoad || !app_code->HotLoad || !app_code->HotUnload || !app_code->Update)
{
app_code->PermanentLoad = ApplicationPermanentLoadStub;
app_code->HotLoad = ApplicationHotLoadStub;
app_code->HotUnload = ApplicationHotUnloadStub;
app_code->Update = ApplicationUpdateStub;
result = 0;
goto end;
}
end:;
return result;
}
internal void
W32_AppCodeUnload(W32_AppCode *app_code)
{
if(app_code->dll)
{
FreeLibrary(app_code->dll);
}
app_code->dll = 0;
app_code->PermanentLoad = ApplicationPermanentLoadStub;
app_code->HotLoad = ApplicationHotLoadStub;
app_code->HotUnload = ApplicationHotUnloadStub;
app_code->Update = ApplicationUpdateStub;
}
internal void
W32_AppCodeUpdate(W32_AppCode *app_code)
{
FILETIME last_write_time = W32_GetLastWriteTime(global_app_dll_path);
if(CompareFileTime(&last_write_time, &app_code->last_dll_write_time))
{
app_code->HotUnload();
W32_AppCodeUnload(app_code);
W32_AppCodeLoad(app_code);
app_code->HotLoad(&global_os);
}
}