Пример #1
0
template<> bool ScriptInterface::FromJSVal<std::wstring>(JSContext* cx, JS::HandleValue v, std::wstring& out)
{
	JSAutoRequest rq(cx);
	WARN_IF_NOT(v.isString() || v.isNumber(), v); // allow implicit number conversions
	JS::RootedString str(cx, JS::ToString(cx, v));
	if (!str)
		FAIL("Argument must be convertible to a string");

	if (JS_StringHasLatin1Chars(str))
	{
		size_t length;
		JS::AutoCheckCannotGC nogc;
		const JS::Latin1Char* ch = JS_GetLatin1StringCharsAndLength(cx, nogc, str, &length);
		if (!ch)
			FAIL("JS_GetLatin1StringCharsAndLength failed");

		out.assign(ch, ch + length);
	}
	else
	{
		size_t length;
		JS::AutoCheckCannotGC nogc;
		const char16_t* ch = JS_GetTwoByteStringCharsAndLength(cx, nogc, str, &length);
		if (!ch)
			FAIL("JS_GetTwoByteStringsCharsAndLength failed"); // out of memory

		out.assign(ch, ch + length);
	}
	return true;
}
Пример #2
0
/**
 * gjs_string_get_char16_data:
 * @context: js context
 * @str: a rooted JSString
 * @data_p: address to return allocated data buffer
 * @len_p: address to return length of data (number of 16-bit characters)
 *
 * Get the binary data (as a sequence of 16-bit characters) in @str.
 *
 * Returns: false if exception thrown
 **/
bool
gjs_string_get_char16_data(JSContext       *context,
                           JS::HandleString str,
                           char16_t       **data_p,
                           size_t          *len_p)
{
    JSAutoRequest ar(context);

    if (JS_StringHasLatin1Chars(str))
        return from_latin1(context, str, data_p, len_p);

    /* From this point on, crash if a GC is triggered while we are using
     * the string's chars */
    JS::AutoCheckCannotGC nogc;

    const char16_t *js_data =
        JS_GetTwoByteStringCharsAndLength(context, nogc, str, len_p);

    if (js_data == NULL)
        return false;

    *data_p = (char16_t *) g_memdup(js_data, sizeof(*js_data) * (*len_p));

    return true;
}
Пример #3
0
void CBinarySerializerScriptImpl::ScriptString(const char* name, JS::HandleString string)
{
	JSContext* cx = m_ScriptInterface.GetContext();
	JSAutoRequest rq(cx);

#if BYTE_ORDER != LITTLE_ENDIAN
#error TODO: probably need to convert JS strings to little-endian
#endif

	size_t length;
	JS::AutoCheckCannotGC nogc;
	// Serialize strings directly as UTF-16 or Latin1, to avoid expensive encoding conversions
	bool isLatin1 = JS_StringHasLatin1Chars(string);
	m_Serializer.Bool("isLatin1", isLatin1);
	if (isLatin1)
	{
		const JS::Latin1Char* chars = JS_GetLatin1StringCharsAndLength(cx, nogc, string, &length);
		if (!chars)
			throw PSERROR_Serialize_ScriptError("JS_GetLatin1StringCharsAndLength failed");
		m_Serializer.NumberU32_Unbounded("string length", (u32)length);
		m_Serializer.RawBytes(name, (const u8*)chars, length);
	}
	else
	{
		const char16_t* chars = JS_GetTwoByteStringCharsAndLength(cx, nogc, string, &length);

		if (!chars)
			throw PSERROR_Serialize_ScriptError("JS_GetTwoByteStringCharsAndLength failed");
		m_Serializer.NumberU32_Unbounded("string length", (u32)length);
		m_Serializer.RawBytes(name, (const u8*)chars, length*2);
	}
}
Пример #4
0
/**
 * gjs_string_to_ucs4:
 * @cx: a #JSContext
 * @str: rooted JSString
 * @ucs4_string_p: return location for a #gunichar array
 * @len_p: return location for @ucs4_string_p length
 *
 * Returns: true on success, false otherwise in which case a JS error is thrown
 */
bool
gjs_string_to_ucs4(JSContext       *cx,
                   JS::HandleString str,
                   gunichar       **ucs4_string_p,
                   size_t          *len_p)
{
    if (ucs4_string_p == NULL)
        return true;

    JSAutoRequest ar(cx);
    size_t len;
    GError *error = NULL;

    if (JS_StringHasLatin1Chars(str))
        return from_latin1(cx, str, ucs4_string_p, len_p);

    /* From this point on, crash if a GC is triggered while we are using
     * the string's chars */
    JS::AutoCheckCannotGC nogc;

    const char16_t *utf16 =
        JS_GetTwoByteStringCharsAndLength(cx, nogc, str, &len);

    if (utf16 == NULL) {
        gjs_throw(cx, "Failed to get UTF-16 string data");
        return false;
    }

    if (ucs4_string_p != NULL) {
        long length;
        *ucs4_string_p = g_utf16_to_ucs4(reinterpret_cast<const gunichar2 *>(utf16),
                                         len, NULL, &length, &error);
        if (*ucs4_string_p == NULL) {
            gjs_throw(cx, "Failed to convert UTF-16 string to UCS-4: %s",
                      error->message);
            g_clear_error(&error);
            return false;
        }
        if (len_p != NULL)
            *len_p = (size_t) length;
    }

    return true;
}
Пример #5
0
bool ScriptInterface::EnumeratePropertyNamesWithPrefix(JS::HandleValue objVal, const char* prefix, std::vector<std::string>& out)
{
	JSAutoRequest rq(m->m_cx);
	
	if (!objVal.isObjectOrNull())
	{
		LOGERROR("EnumeratePropertyNamesWithPrefix expected object type!");
		return false;
	}
		
	if (objVal.isNull())
		return true; // reached the end of the prototype chain
	
	JS::RootedObject obj(m->m_cx, &objVal.toObject());
	JS::AutoIdArray props(m->m_cx, JS_Enumerate(m->m_cx, obj));
	if (!props)
		return false;

	for (size_t i = 0; i < props.length(); ++i)
	{
		JS::RootedId id(m->m_cx, props[i]);
		JS::RootedValue val(m->m_cx);
		if (!JS_IdToValue(m->m_cx, id, &val))
			return false;

		if (!val.isString())
			continue; // ignore integer properties

		JS::RootedString name(m->m_cx, val.toString());
		size_t len = strlen(prefix)+1;
		std::vector<char> buf(len);
		size_t prefixLen = strlen(prefix) * sizeof(char);
		JS_EncodeStringToBuffer(m->m_cx, name, &buf[0], prefixLen);
		buf[len-1]= '\0';
		if (0 == strcmp(&buf[0], prefix))
		{
			if (JS_StringHasLatin1Chars(name))
			{
				size_t length;
				JS::AutoCheckCannotGC nogc;
				const JS::Latin1Char* chars = JS_GetLatin1StringCharsAndLength(m->m_cx, nogc, name, &length);
				if (chars)
					out.push_back(std::string(chars, chars+length));
			}
			else
			{
				size_t length;
				JS::AutoCheckCannotGC nogc;
				const char16_t* chars = JS_GetTwoByteStringCharsAndLength(m->m_cx, nogc, name, &length);
				if (chars)
					out.push_back(std::string(chars, chars+length));
			}
		}
	}

	// Recurse up the prototype chain
	JS::RootedObject prototype(m->m_cx);
	if (JS_GetPrototype(m->m_cx, obj, &prototype))
	{
		JS::RootedValue prototypeVal(m->m_cx, JS::ObjectOrNullValue(prototype));
		if (!EnumeratePropertyNamesWithPrefix(prototypeVal, prefix, out))
			return false;
	}

	return true;
}
Пример #6
0
void CBinarySerializerScriptImpl::HandleScriptVal(JS::HandleValue val)
{
	JSContext* cx = m_ScriptInterface.GetContext();
	JSAutoRequest rq(cx);

	switch (JS_TypeOfValue(cx, val))
	{
	case JSTYPE_VOID:
	{
		m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_VOID);
		break;
	}
	case JSTYPE_NULL: // This type is never actually returned (it's a JS2 feature)
	{
		m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_NULL);
		break;
	}
	case JSTYPE_OBJECT:
	{
		if (val.isNull())
		{
			m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_NULL);
			break;
		}

		JS::RootedObject obj(cx, &val.toObject());

		// If we've already serialized this object, just output a reference to it
		u32 tag = GetScriptBackrefTag(obj);
		if (tag)
		{
			m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_BACKREF);
			m_Serializer.NumberU32_Unbounded("tag", tag);
			break;
		}

		// Arrays are special cases of Object
		if (JS_IsArrayObject(cx, obj))
		{
			m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_ARRAY);
			// TODO: probably should have a more efficient storage format

			// Arrays like [1, 2, ] have an 'undefined' at the end which is part of the
			// length but seemingly isn't enumerated, so store the length explicitly
			uint length = 0;
			if (!JS_GetArrayLength(cx, obj, &length))
				throw PSERROR_Serialize_ScriptError("JS_GetArrayLength failed");
			m_Serializer.NumberU32_Unbounded("array length", length);
		}
		else if (JS_IsTypedArrayObject(obj))
		{
			m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_TYPED_ARRAY);

			m_Serializer.NumberU8_Unbounded("array type", GetArrayType(JS_GetArrayBufferViewType(obj)));
			m_Serializer.NumberU32_Unbounded("byte offset", JS_GetTypedArrayByteOffset(obj));
			m_Serializer.NumberU32_Unbounded("length", JS_GetTypedArrayLength(obj));

			// Now handle its array buffer
			// this may be a backref, since ArrayBuffers can be shared by multiple views
			JS::RootedValue bufferVal(cx, JS::ObjectValue(*JS_GetArrayBufferViewBuffer(cx, obj)));
			HandleScriptVal(bufferVal);
			break;
		}
		else if (JS_IsArrayBufferObject(obj))
		{
			m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_ARRAY_BUFFER);

#if BYTE_ORDER != LITTLE_ENDIAN
#error TODO: need to convert JS ArrayBuffer data to little-endian
#endif

			u32 length = JS_GetArrayBufferByteLength(obj);
			m_Serializer.NumberU32_Unbounded("buffer length", length);
			JS::AutoCheckCannotGC nogc;
			m_Serializer.RawBytes("buffer data", (const u8*)JS_GetArrayBufferData(obj, nogc), length);
			break;
		}
		else
		{
			// Find type of object
			const JSClass* jsclass = JS_GetClass(obj);
			if (!jsclass)
				throw PSERROR_Serialize_ScriptError("JS_GetClass failed");
// TODO: Remove this workaround for upstream API breakage when updating SpiderMonkey
// See https://bugzilla.mozilla.org/show_bug.cgi?id=1236373
#define JSCLASS_CACHED_PROTO_WIDTH js::JSCLASS_CACHED_PROTO_WIDTH
			JSProtoKey protokey = JSCLASS_CACHED_PROTO_KEY(jsclass);
#undef JSCLASS_CACHED_PROTO_WIDTH

			if (protokey == JSProto_Object)
			{
				// Object class - check for user-defined prototype
				JS::RootedObject proto(cx);
				JS_GetPrototype(cx, obj, &proto);
				if (!proto)
					throw PSERROR_Serialize_ScriptError("JS_GetPrototype failed");

				if (m_SerializablePrototypes->empty() || !IsSerializablePrototype(proto))
				{
					// Standard Object prototype
					m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_OBJECT);

					// TODO: maybe we should throw an error for unrecognized non-Object prototypes?
					//	(requires fixing AI serialization first and excluding component scripts)
				}
				else
				{
					// User-defined custom prototype
					m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_OBJECT_PROTOTYPE);

					const std::wstring prototypeName = GetPrototypeName(proto);
					m_Serializer.String("proto name", prototypeName, 0, 256);

					// Does it have custom Serialize function?
					// if so, we serialize the data it returns, rather than the object's properties directly
					bool hasCustomSerialize;
					if (!JS_HasProperty(cx, obj, "Serialize", &hasCustomSerialize))
						throw PSERROR_Serialize_ScriptError("JS_HasProperty failed");

					if (hasCustomSerialize)
					{
						JS::RootedValue serialize(cx);
						if (!JS_GetProperty(cx, obj, "Serialize", &serialize))
							throw PSERROR_Serialize_ScriptError("JS_GetProperty failed");

						// If serialize is null, so don't serialize anything more
						if (!serialize.isNull())
						{
							JS::RootedValue data(cx);
							if (!m_ScriptInterface.CallFunction(val, "Serialize", &data))
								throw PSERROR_Serialize_ScriptError("Prototype Serialize function failed");
							HandleScriptVal(data);
						}
						break;
					}
				}
			}
			else if (protokey == JSProto_Number)
			{
				// Standard Number object
				m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_OBJECT_NUMBER);
				// Get primitive value
				double d;
				if (!JS::ToNumber(cx, val, &d))
					throw PSERROR_Serialize_ScriptError("JS::ToNumber failed");
				m_Serializer.NumberDouble_Unbounded("value", d);
				break;
			}
			else if (protokey == JSProto_String)
			{
				// Standard String object
				m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_OBJECT_STRING);
				// Get primitive value
				JS::RootedString str(cx, JS::ToString(cx, val));
				if (!str)
					throw PSERROR_Serialize_ScriptError("JS_ValueToString failed");
				ScriptString("value", str);
				break;
			}
			else if (protokey == JSProto_Boolean)
			{
				// Standard Boolean object
				m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_OBJECT_BOOLEAN);
				// Get primitive value
				bool b = JS::ToBoolean(val);
				m_Serializer.Bool("value", b);
				break;
			}
			// TODO: Follow upstream progresses about a JS::IsMapObject
			// https://bugzilla.mozilla.org/show_bug.cgi?id=1285909
			else if (protokey == JSProto_Map)
			{
				m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_OBJECT_MAP);
				m_Serializer.NumberU32_Unbounded("map size", JS::MapSize(cx, obj));

				JS::RootedValue keyValueIterator(cx);
				if (!JS::MapEntries(cx, obj, &keyValueIterator))
					throw PSERROR_Serialize_ScriptError("JS::MapEntries failed");

				JS::ForOfIterator it(cx);
				if (!it.init(keyValueIterator))
					throw PSERROR_Serialize_ScriptError("JS::ForOfIterator::init failed");

				JS::RootedValue keyValuePair(cx);
				bool done;
				while (true)
				{
					if (!it.next(&keyValuePair, &done))
						throw PSERROR_Serialize_ScriptError("JS::ForOfIterator::next failed");

					if (done)
						break;

					JS::RootedObject keyValuePairObj(cx, &keyValuePair.toObject());
					JS::RootedValue key(cx);
					JS::RootedValue value(cx);
					ENSURE(JS_GetElement(cx, keyValuePairObj, 0, &key));
					ENSURE(JS_GetElement(cx, keyValuePairObj, 1, &value));

					HandleScriptVal(key);
					HandleScriptVal(value);
				}
				break;
			}
			// TODO: Follow upstream progresses about a JS::IsSetObject
			// https://bugzilla.mozilla.org/show_bug.cgi?id=1285909
			else if (protokey == JSProto_Set)
			{
				// TODO: When updating SpiderMonkey to a release after 38 use the C++ API for Sets.
				// https://bugzilla.mozilla.org/show_bug.cgi?id=1159469
				u32 setSize;
				m_ScriptInterface.GetProperty(val, "size", setSize);

				m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_OBJECT_SET);
				m_Serializer.NumberU32_Unbounded("set size", setSize);

				JS::RootedValue valueIterator(cx);
				m_ScriptInterface.CallFunction(val, "values", &valueIterator);
				for (u32 i=0; i<setSize; ++i)
				{
					JS::RootedValue currentIterator(cx);
					JS::RootedValue value(cx);
					ENSURE(m_ScriptInterface.CallFunction(valueIterator, "next", &currentIterator));

					m_ScriptInterface.GetProperty(currentIterator, "value", &value);

					HandleScriptVal(value);
				}

				break;
			}
			else
			{
				// Unrecognized class
				LOGERROR("Cannot serialise JS objects with unrecognized class '%s'", jsclass->name);
				throw PSERROR_Serialize_InvalidScriptValue();
			}
		}

		// Find all properties (ordered by insertion time)
		JS::AutoIdArray ida (cx, JS_Enumerate(cx, obj));
		if (!ida)
			throw PSERROR_Serialize_ScriptError("JS_Enumerate failed");

		m_Serializer.NumberU32_Unbounded("num props", (u32)ida.length());

		for (size_t i = 0; i < ida.length(); ++i)
		{
			JS::RootedId id(cx, ida[i]);

			JS::RootedValue idval(cx);
			JS::RootedValue propval(cx);

			// Forbid getters, which might delete values and mess things up.
			JS::Rooted<JSPropertyDescriptor> desc(cx);
			if (!JS_GetPropertyDescriptorById(cx, obj, id, &desc))
				throw PSERROR_Serialize_ScriptError("JS_GetPropertyDescriptorById failed");
			if (desc.hasGetterObject())
				throw PSERROR_Serialize_ScriptError("Cannot serialize property getters");

			// Get the property name as a string
			if (!JS_IdToValue(cx, id, &idval))
				throw PSERROR_Serialize_ScriptError("JS_IdToValue failed");
			JS::RootedString idstr(cx, JS::ToString(cx, idval));
			if (!idstr)
				throw PSERROR_Serialize_ScriptError("JS_ValueToString failed");

			ScriptString("prop name", idstr);

			if (!JS_GetPropertyById(cx, obj, id, &propval))
				throw PSERROR_Serialize_ScriptError("JS_GetPropertyById failed");

			HandleScriptVal(propval);
		}

		break;
	}
	case JSTYPE_FUNCTION:
	{
		// We can't serialise functions, but we can at least name the offender (hopefully)
		std::wstring funcname(L"(unnamed)");
		JS::RootedFunction func(cx, JS_ValueToFunction(cx, val));
		if (func)
		{
			JS::RootedString string(cx, JS_GetFunctionId(func));
			if (string)
			{
				if (JS_StringHasLatin1Chars(string))
				{
					size_t length;
					JS::AutoCheckCannotGC nogc;
					const JS::Latin1Char* ch = JS_GetLatin1StringCharsAndLength(cx, nogc, string, &length);
					if (ch && length > 0)
						funcname.assign(ch, ch + length);
				}
				else
				{
					size_t length;
					JS::AutoCheckCannotGC nogc;
					const char16_t* ch = JS_GetTwoByteStringCharsAndLength(cx, nogc, string, &length);
					if (ch && length > 0)
						funcname.assign(ch, ch + length);
				}
			}
		}

		LOGERROR("Cannot serialise JS objects of type 'function': %s", utf8_from_wstring(funcname));
		throw PSERROR_Serialize_InvalidScriptValue();
	}
	case JSTYPE_STRING:
	{
		m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_STRING);
		JS::RootedString stringVal(cx, val.toString());
		ScriptString("string", stringVal);
		break;
	}
	case JSTYPE_NUMBER:
	{
		// To reduce the size of the serialized data, we handle integers and doubles separately.
		// We can't check for val.isInt32 and val.isDouble directly, because integer numbers are not guaranteed
		// to be represented as integers. A number like 33 could be stored as integer on the computer of one player
		// and as double on the other player's computer. That would cause out of sync errors in multiplayer games because
		// their binary representation and thus the hash would be different.

		double d;
		d = val.toNumber();
		i32 integer;

		if (JS_DoubleIsInt32(d, &integer))
		{
			m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_INT);
			m_Serializer.NumberI32_Unbounded("value", integer);
		}
		else
		{
			m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_DOUBLE);
			m_Serializer.NumberDouble_Unbounded("value", d);
		}
		break;
	}
	case JSTYPE_BOOLEAN:
	{
		m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_BOOLEAN);
		bool b = val.toBoolean();
		m_Serializer.NumberU8_Unbounded("value", b ? 1 : 0);
		break;
	}
	default:
	{
		debug_warn(L"Invalid TypeOfValue");
		throw PSERROR_Serialize_InvalidScriptValue();
	}
	}
}