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