dom/base/StructuredCloneTester.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "StructuredCloneTester.h"
   8
   9 #include "js/StructuredClone.h"
  10 #include "mozilla/RefPtr.h"
  11 #include "mozilla/dom/StructuredCloneTags.h"
  12 #include "mozilla/dom/StructuredCloneTesterBinding.h"
  13 #include "xpcpublic.h"
  14
  15 namespace mozilla {
  16
  17 class ErrorResult;
  18
  19 namespace dom {
  20
  21 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(StructuredCloneTester)
  22 NS_IMPL_CYCLE_COLLECTING_ADDREF(StructuredCloneTester)
  23 NS_IMPL_CYCLE_COLLECTING_RELEASE(StructuredCloneTester)
  24 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(StructuredCloneTester)
  25   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  26   NS_INTERFACE_MAP_ENTRY(nsISupports)
  27 NS_INTERFACE_MAP_END
  28
  29 StructuredCloneTester::StructuredCloneTester(nsISupports* aParent,
  30                                              const bool aSerializable,
  31                                              const bool aDeserializable)
  32     : mParent(aParent),
  33       mSerializable(aSerializable),
  34       mDeserializable(aDeserializable) {}
  35
  36 /* static */
  37 already_AddRefed<StructuredCloneTester> StructuredCloneTester::Constructor(
  38     const GlobalObject& aGlobal, const bool aSerializable,
  39     const bool aDeserializable, ErrorResult& aRv) {
  40   RefPtr<StructuredCloneTester> sct = new StructuredCloneTester(
  41       aGlobal.GetAsSupports(), aSerializable, aDeserializable);
  42   return sct.forget();
  43 }
  44
  45 bool StructuredCloneTester::Serializable() const { return mSerializable; }
  46
  47 bool StructuredCloneTester::Deserializable() const { return mDeserializable; }
  48
  49 /* static */
  50 JSObject* StructuredCloneTester::ReadStructuredClone(
  51     JSContext* aCx, JSStructuredCloneReader* aReader) {
  52   uint32_t serializable = 0;
  53   uint32_t deserializable = 0;
  54
  55   if (!JS_ReadUint32Pair(aReader, &serializable, &deserializable)) {
  56     return nullptr;
  57   }
  58
  59   nsIGlobalObject* global = xpc::CurrentNativeGlobal(aCx);
  60
  61   if (NS_WARN_IF(!global)) {
  62     return nullptr;
  63   }
  64
  65   // Prevent the return value from being trashed by a GC during ~RefPtr
  66   JS::Rooted<JSObject*> result(aCx);
  67   {
  68     RefPtr<StructuredCloneTester> sct =
  69         new StructuredCloneTester(global, static_cast<bool>(serializable),
  70                                   static_cast<bool>(deserializable));
  71
  72     // "Fail" deserialization
  73     if (!sct->Deserializable()) {
  74       xpc::Throw(aCx, NS_ERROR_DOM_DATA_CLONE_ERR);
  75       return nullptr;
  76     }
  77
  78     result = sct->WrapObject(aCx, nullptr);
  79   }
  80
  81   return result;
  82 }
  83
  84 bool StructuredCloneTester::WriteStructuredClone(
  85     JSStructuredCloneWriter* aWriter) const {
  86   return JS_WriteUint32Pair(aWriter, SCTAG_DOM_STRUCTURED_CLONE_TESTER, 0) &&
  87          JS_WriteUint32Pair(aWriter, static_cast<uint32_t>(Serializable()),
  88                             static_cast<uint32_t>(Deserializable()));
  89 }
  90
  91 nsISupports* StructuredCloneTester::GetParentObject() const { return mParent; }
  92
  93 JSObject* StructuredCloneTester::WrapObject(JSContext* aCx,
  94                                             JS::Handle<JSObject*> aGivenProto) {
  95   return StructuredCloneTester_Binding::Wrap(aCx, this, aGivenProto);
  96 }
  97
  98 }  // namespace dom
  99 }  // namespace mozilla