gecko-dev/dom/plugins/ipc/PluginScriptableObjectUtils-inl.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et :
 * 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 "PluginScriptableObjectUtils.h"

namespace {

template <class InstanceType>
class VariantTraits;

template <>
class VariantTraits<mozilla::plugins::PluginInstanceParent> {
 public:
  typedef mozilla::plugins::PluginScriptableObjectParent ScriptableObjectType;
};

template <>
class VariantTraits<mozilla::plugins::PluginInstanceChild> {
 public:
  typedef mozilla::plugins::PluginScriptableObjectChild ScriptableObjectType;
};

} /* anonymous namespace */

inline bool mozilla::plugins::ConvertToVariant(
    const Variant& aRemoteVariant, NPVariant& aVariant,
    PluginInstanceParent* aInstance) {
  switch (aRemoteVariant.type()) {
    case Variant::Tvoid_t: {
      VOID_TO_NPVARIANT(aVariant);
      break;
    }

    case Variant::Tnull_t: {
      NULL_TO_NPVARIANT(aVariant);
      break;
    }

    case Variant::Tbool: {
      BOOLEAN_TO_NPVARIANT(aRemoteVariant.get_bool(), aVariant);
      break;
    }

    case Variant::Tint: {
      INT32_TO_NPVARIANT(aRemoteVariant.get_int(), aVariant);
      break;
    }

    case Variant::Tdouble: {
      DOUBLE_TO_NPVARIANT(aRemoteVariant.get_double(), aVariant);
      break;
    }

    case Variant::TnsCString: {
      const nsCString& string = aRemoteVariant.get_nsCString();
      const size_t length = string.Length();
      NPUTF8* buffer =
          static_cast<NPUTF8*>(::malloc(sizeof(NPUTF8) * (length + 1)));
      if (!buffer) {
        NS_ERROR("Out of memory!");
        return false;
      }

      std::copy(string.get(), string.get() + length, buffer);
      buffer[length] = '\0';
      STRINGN_TO_NPVARIANT(buffer, length, aVariant);
      break;
    }

    case Variant::TPPluginScriptableObjectParent: {
      NS_ASSERTION(aInstance, "Must have an instance!");
      NPObject* object = NPObjectFromVariant(aRemoteVariant);
      if (!object) {
        NS_ERROR("Er, this shouldn't fail!");
        return false;
      }

      const NPNetscapeFuncs* npn = GetNetscapeFuncs(aInstance);
      if (!npn) {
        NS_ERROR("Null netscape funcs!");
        return false;
      }

      npn->retainobject(object);
      OBJECT_TO_NPVARIANT(object, aVariant);
      break;
    }

    case Variant::TPPluginScriptableObjectChild: {
      NS_ASSERTION(!aInstance, "No instance should be given!");
      NS_ASSERTION(XRE_GetProcessType() == GeckoProcessType_Plugin,
                   "Should be running on child only!");

      NPObject* object = NPObjectFromVariant(aRemoteVariant);
      NS_ASSERTION(object, "Null object?!");

      PluginModuleChild::sBrowserFuncs.retainobject(object);
      OBJECT_TO_NPVARIANT(object, aVariant);
      break;
    }

    default:
      MOZ_ASSERT_UNREACHABLE("Shouldn't get here!");
      return false;
  }

  return true;
}

template <class InstanceType>
bool mozilla::plugins::ConvertToRemoteVariant(const NPVariant& aVariant,
                                              Variant& aRemoteVariant,
                                              InstanceType* aInstance,
                                              bool aProtectActors) {
  if (NPVARIANT_IS_VOID(aVariant)) {
    aRemoteVariant = mozilla::void_t();
  } else if (NPVARIANT_IS_NULL(aVariant)) {
    aRemoteVariant = mozilla::null_t();
  } else if (NPVARIANT_IS_BOOLEAN(aVariant)) {
    aRemoteVariant = NPVARIANT_TO_BOOLEAN(aVariant);
  } else if (NPVARIANT_IS_INT32(aVariant)) {
    aRemoteVariant = NPVARIANT_TO_INT32(aVariant);
  } else if (NPVARIANT_IS_DOUBLE(aVariant)) {
    aRemoteVariant = NPVARIANT_TO_DOUBLE(aVariant);
  } else if (NPVARIANT_IS_STRING(aVariant)) {
    NPString str = NPVARIANT_TO_STRING(aVariant);
    nsCString string(str.UTF8Characters, str.UTF8Length);
    aRemoteVariant = string;
  } else if (NPVARIANT_IS_OBJECT(aVariant)) {
    NPObject* object = NPVARIANT_TO_OBJECT(aVariant);

    typename VariantTraits<InstanceType>::ScriptableObjectType* actor =
        aInstance->GetActorForNPObject(object);

    if (!actor) {
      NS_ERROR("Null actor!");
      return false;
    }

    if (aProtectActors) {
      actor->Protect();
    }

    aRemoteVariant = actor;
  } else {
    MOZ_ASSERT_UNREACHABLE("Shouldn't get here!");
    return false;
  }

  return true;
}