dom/workers/ChromeWorkerScope.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 file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "ChromeWorkerScope.h"
   8
   9 #include "jsapi.h"
  10 #include "js/PropertyAndElement.h"  // JS_GetProperty
  11 #include "js/experimental/CTypes.h"  // JS::InitCTypesClass, JS::CTypesCallbacks, JS::SetCTypesCallbacks
  12 #include "js/MemoryFunctions.h"
  13
  14 #include "nsNativeCharsetUtils.h"
  15 #include "nsString.h"
  16
  17 namespace mozilla {
  18 namespace dom {
  19
  20 namespace {
  21
  22 #ifdef BUILD_CTYPES
  23
  24 char* UnicodeToNative(JSContext* aCx, const char16_t* aSource,
  25                       size_t aSourceLen) {
  26   nsDependentSubstring unicode(aSource, aSourceLen);
  27
  28   nsAutoCString native;
  29   if (NS_FAILED(NS_CopyUnicodeToNative(unicode, native))) {
  30     JS_ReportErrorASCII(aCx, "Could not convert string to native charset!");
  31     return nullptr;
  32   }
  33
  34   char* result = static_cast<char*>(JS_malloc(aCx, native.Length() + 1));
  35   if (!result) {
  36     return nullptr;
  37   }
  38
  39   memcpy(result, native.get(), native.Length());
  40   result[native.Length()] = 0;
  41   return result;
  42 }
  43
  44 #endif  // BUILD_CTYPES
  45
  46 }  // namespace
  47
  48 bool DefineChromeWorkerFunctions(JSContext* aCx,
  49                                  JS::Handle<JSObject*> aGlobal) {
  50   // Currently ctypes is the only special property given to ChromeWorkers.
  51 #ifdef BUILD_CTYPES
  52   {
  53     JS::Rooted<JS::Value> ctypes(aCx);
  54     if (!JS::InitCTypesClass(aCx, aGlobal) ||
  55         !JS_GetProperty(aCx, aGlobal, "ctypes", &ctypes)) {
  56       return false;
  57     }
  58
  59     static const JS::CTypesCallbacks callbacks = {UnicodeToNative};
  60
  61     JS::SetCTypesCallbacks(ctypes.toObjectOrNull(), &callbacks);
  62   }
  63 #endif  // BUILD_CTYPES
  64
  65   return true;
  66 }
  67
  68 }  // namespace dom
  69 }  // namespace mozilla