static void
InitializeHooks()
{
static bool initialized = false;
if (initialized) {
return;
}
initialized = true;
sDeviceNames = new std::unordered_map<std::wstring, std::wstring>();
for (const std::wstring& name : GetDosDeviceNames()) {
sDeviceNames->emplace(name, GetDeviceMapping(name));
}
sKernel32Intercept.Init("kernelbase.dll");
sOriginalQueryDosDeviceWFnPtr.Set(sKernel32Intercept, "QueryDosDeviceW",
&QueryDosDeviceWHook);
}
void Compatibility::Init() {
// Note we collect some AT statistics/telemetry here for convenience.
InitConsumers();
CrashReporter::AnnotateCrashReport(
CrashReporter::Annotation::AccessibilityInProcClient,
nsPrintfCString("0x%X", sConsumers));
// Gather telemetry
uint32_t temp = sConsumers;
for (int i = 0; temp; i++) {
if (temp & 0x1) statistics::A11yConsumers(i);
temp >>= 1;
}
// Turn off new tab switching for Jaws and WE.
if (sConsumers & (JAWS | OLDJAWS | WE)) {
// Check to see if the pref for disallowing CtrlTab is already set. If so,
// bail out (respect the user settings). If not, set it.
if (!Preferences::HasUserValue("browser.ctrlTab.disallowForScreenReaders"))
Preferences::SetBool("browser.ctrlTab.disallowForScreenReaders", true);
}
// If we have a consumer who is not NVDA, we enable detection for the
// InSendMessageEx compatibility hack. NVDA does not require this.
// We also skip UIA, as we see crashes there.
if ((sConsumers & (~(UIAUTOMATION | NVDA))) && BrowserTabsRemoteAutostart()) {
sUser32Interceptor.Init("user32.dll");
sInSendMessageExStub.Set(sUser32Interceptor, "InSendMessageEx",
&InSendMessageExHook);
// The vectored exception handler allows us to catch exceptions ahead of any
// SEH handlers.
if (!sVectoredExceptionHandler) {
// We need to let ASan's ShadowExceptionHandler remain in the firstHandler
// position, otherwise we'll get infinite recursion when our handler
// faults on shadow memory.
const ULONG firstHandler = FALSE;
sVectoredExceptionHandler = AddVectoredExceptionHandler(
firstHandler, &DetectInSendMessageExCompat);
}
}
}