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