mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-23 12:51:06 +00:00
e3989e26b1
Differential Revision: https://phabricator.services.mozilla.com/D194468
93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "ChromeUtils.h"
|
|
#include "MozQueryInterface.h"
|
|
#include "xptinfo.h"
|
|
|
|
#include <string.h>
|
|
|
|
#include "jsapi.h"
|
|
|
|
#include "mozilla/ErrorResult.h"
|
|
#include "xpcpublic.h"
|
|
|
|
namespace mozilla::dom {
|
|
|
|
constexpr size_t IID_SIZE = sizeof(nsIID);
|
|
|
|
static_assert(
|
|
IID_SIZE == 16,
|
|
"Size of nsID struct changed. Please ensure this code is still valid.");
|
|
|
|
static int CompareIIDs(const nsIID& aA, const nsIID& aB) {
|
|
return memcmp((void*)&aA.m0, (void*)&aB.m0, IID_SIZE);
|
|
}
|
|
|
|
/* static */
|
|
UniquePtr<MozQueryInterface> ChromeUtils::GenerateQI(
|
|
const GlobalObject& aGlobal, const Sequence<JS::Value>& aInterfaces) {
|
|
JSContext* cx = aGlobal.Context();
|
|
|
|
nsTArray<nsIID> ifaces;
|
|
|
|
JS::Rooted<JS::Value> iface(cx);
|
|
for (uint32_t idx = 0; idx < aInterfaces.Length(); ++idx) {
|
|
iface = aInterfaces[idx];
|
|
|
|
// Handle ID objects
|
|
if (Maybe<nsID> id = xpc::JSValue2ID(cx, iface)) {
|
|
ifaces.AppendElement(*id);
|
|
continue;
|
|
}
|
|
|
|
// Accept string valued names
|
|
if (iface.isString()) {
|
|
JS::UniqueChars name = JS_EncodeStringToLatin1(cx, iface.toString());
|
|
|
|
const nsXPTInterfaceInfo* iinfo = nsXPTInterfaceInfo::ByName(name.get());
|
|
if (iinfo) {
|
|
ifaces.AppendElement(iinfo->IID());
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// NOTE: We ignore unknown interfaces here because in some cases we try to
|
|
// pass them in to support multiple platforms.
|
|
}
|
|
|
|
MOZ_ASSERT(!ifaces.Contains(NS_GET_IID(nsISupports), CompareIIDs));
|
|
ifaces.AppendElement(NS_GET_IID(nsISupports));
|
|
|
|
ifaces.Sort(CompareIIDs);
|
|
|
|
return MakeUnique<MozQueryInterface>(std::move(ifaces));
|
|
}
|
|
|
|
bool MozQueryInterface::QueriesTo(const nsIID& aIID) const {
|
|
return mInterfaces.ContainsSorted(aIID, CompareIIDs);
|
|
}
|
|
|
|
void MozQueryInterface::LegacyCall(JSContext* cx, JS::Handle<JS::Value> thisv,
|
|
JS::Handle<JS::Value> aIID,
|
|
JS::MutableHandle<JS::Value> aResult,
|
|
ErrorResult& aRv) const {
|
|
Maybe<nsID> id = xpc::JSValue2ID(cx, aIID);
|
|
if (id && QueriesTo(*id)) {
|
|
aResult.set(thisv);
|
|
} else {
|
|
aRv.Throw(NS_ERROR_NO_INTERFACE);
|
|
}
|
|
}
|
|
|
|
bool MozQueryInterface::WrapObject(JSContext* aCx,
|
|
JS::Handle<JSObject*> aGivenProto,
|
|
JS::MutableHandle<JSObject*> aReflector) {
|
|
return MozQueryInterface_Binding::Wrap(aCx, this, aGivenProto, aReflector);
|
|
}
|
|
|
|
} // namespace mozilla::dom
|