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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /dom/base/MozQueryInterface.cpp | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/base/MozQueryInterface.cpp')
-rw-r--r-- | dom/base/MozQueryInterface.cpp | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/dom/base/MozQueryInterface.cpp b/dom/base/MozQueryInterface.cpp new file mode 100644 index 0000000000..032b827b3b --- /dev/null +++ b/dom/base/MozQueryInterface.cpp @@ -0,0 +1,92 @@ +/* -*- 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 |