Source code

Revision control

Copy as Markdown

Other Tools

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*-
* 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 */
#include "ctypes.h"
#include "jsapi.h"
#include "js/experimental/CTypes.h" // JS::CTypesCallbacks, JS::InitCTypesClass, JS::SetCTypesCallbacks
#include "js/MemoryFunctions.h"
#include "js/PropertyAndElement.h" // JS_GetProperty
#include "nsString.h"
#include "nsNativeCharsetUtils.h"
#include "mozJSModuleLoader.h"
#include "xpc_make_class.h"
namespace mozilla::ctypes {
static char* UnicodeToNative(JSContext* cx, const char16_t* source,
size_t slen) {
nsAutoCString native;
nsDependentSubstring unicode(source, slen);
nsresult rv = NS_CopyUnicodeToNative(unicode, native);
if (NS_FAILED(rv)) {
JS_ReportErrorASCII(cx, "could not convert string to native charset");
return nullptr;
char* result = static_cast<char*>(JS_malloc(cx, native.Length() + 1));
if (!result) {
return nullptr;
memcpy(result, native.get(), native.Length() + 1);
return result;
static JS::CTypesCallbacks sCallbacks = {UnicodeToNative};
NS_IMPL_ISUPPORTS(Module, nsIXPCScriptable)
Module::Module() = default;
Module::~Module() = default;
#define XPC_MAP_CLASSNAME Module
#include "xpc_map_end.h"
static bool InitCTypesClassAndSetCallbacks(JSContext* cx,
JS::Handle<JSObject*> global) {
// Init the ctypes object.
if (!JS::InitCTypesClass(cx, global)) {
return false;
// Set callbacks for charset conversion and such.
JS::Rooted<JS::Value> ctypes(cx);
if (!JS_GetProperty(cx, global, "ctypes", &ctypes)) {
return false;
JS::SetCTypesCallbacks(ctypes.toObjectOrNull(), &sCallbacks);
return true;
Module::Call(nsIXPConnectWrappedNative* wrapper, JSContext* cx, JSObject* obj,
const JS::CallArgs& args, bool* _retval) {
mozJSModuleLoader* loader = mozJSModuleLoader::Get();
JS::Rooted<JSObject*> targetObj(cx);
loader->FindTargetObject(cx, &targetObj);
*_retval = InitCTypesClassAndSetCallbacks(cx, targetObj);
return NS_OK;
} // namespace mozilla::ctypes