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/* -*- 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 http://mozilla.org/MPL/2.0/. */
#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
#define XPC_MAP_QUOTED_CLASSNAME "Module"
#define XPC_MAP_FLAGS XPC_SCRIPTABLE_WANT_CALL
#include "xpc_map_end.h"
static bool SealObjectAndPrototype(JSContext* cx, JS::Handle<JSObject*> parent,
const char* name) {
JS::Rooted<JS::Value> prop(cx);
if (!JS_GetProperty(cx, parent, name, &prop)) return false;
if (prop.isUndefined()) {
// Pretend we sealed the object.
return true;
}
JS::Rooted<JSObject*> obj(cx, prop.toObjectOrNull());
if (!JS_GetProperty(cx, obj, "prototype", &prop)) return false;
JS::Rooted<JSObject*> prototype(cx, prop.toObjectOrNull());
return JS_FreezeObject(cx, obj) && JS_FreezeObject(cx, prototype);
}
static bool InitAndSealCTypesClass(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);
// Seal up Object, Function, Array and Error and their prototypes. (This
// single object instance is shared amongst everyone who imports the ctypes
// module.)
if (!SealObjectAndPrototype(cx, global, "Object") ||
!SealObjectAndPrototype(cx, global, "Function") ||
!SealObjectAndPrototype(cx, global, "Array") ||
!SealObjectAndPrototype(cx, global, "Error"))
return false;
return true;
}
NS_IMETHODIMP
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 = InitAndSealCTypesClass(cx, targetObj);
return NS_OK;
}
} // namespace mozilla::ctypes
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