mirror of
https://github.com/mozilla/gecko-dev.git
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92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ChromeUtils.h"
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#include "MozQueryInterface.h"
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#include "xptinfo.h"
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#include <string.h>
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#include "jsapi.h"
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#include "mozilla/ErrorResult.h"
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#include "xpcpublic.h"
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namespace mozilla::dom {
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constexpr size_t IID_SIZE = sizeof(nsIID);
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static_assert(
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IID_SIZE == 16,
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"Size of nsID struct changed. Please ensure this code is still valid.");
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static int CompareIIDs(const nsIID& aA, const nsIID& aB) {
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return memcmp((void*)&aA.m0, (void*)&aB.m0, IID_SIZE);
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}
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/* static */
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UniquePtr<MozQueryInterface> ChromeUtils::GenerateQI(
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const GlobalObject& aGlobal, const Sequence<JS::Value>& aInterfaces) {
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JSContext* cx = aGlobal.Context();
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nsTArray<nsIID> ifaces;
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JS::Rooted<JS::Value> iface(cx);
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for (uint32_t idx = 0; idx < aInterfaces.Length(); ++idx) {
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iface = aInterfaces[idx];
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// Handle ID objects
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if (Maybe<nsID> id = xpc::JSValue2ID(cx, iface)) {
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ifaces.AppendElement(*id);
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continue;
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}
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// Accept string valued names
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if (iface.isString()) {
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JS::UniqueChars name = JS_EncodeStringToLatin1(cx, iface.toString());
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const nsXPTInterfaceInfo* iinfo = nsXPTInterfaceInfo::ByName(name.get());
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if (iinfo) {
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ifaces.AppendElement(iinfo->IID());
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continue;
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}
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}
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// NOTE: We ignore unknown interfaces here because in some cases we try to
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// pass them in to support multiple platforms.
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}
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MOZ_ASSERT(!ifaces.Contains(NS_GET_IID(nsISupports), CompareIIDs));
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ifaces.AppendElement(NS_GET_IID(nsISupports));
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ifaces.Sort(CompareIIDs);
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return MakeUnique<MozQueryInterface>(std::move(ifaces));
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}
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bool MozQueryInterface::QueriesTo(const nsIID& aIID) const {
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return mInterfaces.ContainsSorted(aIID, CompareIIDs);
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}
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void MozQueryInterface::LegacyCall(JSContext* cx, JS::Handle<JS::Value> thisv,
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JS::Handle<JS::Value> aIID,
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JS::MutableHandle<JS::Value> aResult,
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ErrorResult& aRv) const {
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Maybe<nsID> id = xpc::JSValue2ID(cx, aIID);
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if (id && QueriesTo(*id)) {
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aResult.set(thisv);
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} else {
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aRv.Throw(NS_ERROR_NO_INTERFACE);
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}
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}
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bool MozQueryInterface::WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto,
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JS::MutableHandle<JSObject*> aReflector) {
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return MozQueryInterface_Binding::Wrap(aCx, this, aGivenProto, aReflector);
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}
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} // namespace mozilla::dom
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