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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "dbus/values_util.h"
#include "base/json/json_writer.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/values.h"
#include "dbus/message.h"
namespace dbus {
namespace {
// Returns whether |value| is exactly representable by double or not.
template<typename T>
bool IsExactlyRepresentableByDouble(T value) {
return value == static_cast<T>(static_cast<double>(value));
}
// Pops values from |reader| and appends them to |list_value|.
bool PopListElements(MessageReader* reader, base::ListValue* list_value) {
while (reader->HasMoreData()) {
base::Value* element_value = PopDataAsValue(reader);
if (!element_value)
return false;
list_value->Append(element_value);
}
return true;
}
// Pops dict-entries from |reader| and sets them to |dictionary_value|
bool PopDictionaryEntries(MessageReader* reader,
base::DictionaryValue* dictionary_value) {
while (reader->HasMoreData()) {
DCHECK_EQ(Message::DICT_ENTRY, reader->GetDataType());
MessageReader entry_reader(NULL);
if (!reader->PopDictEntry(&entry_reader))
return false;
// Get key as a string.
std::string key_string;
if (entry_reader.GetDataType() == Message::STRING) {
// If the type of keys is STRING, pop it directly.
if (!entry_reader.PopString(&key_string))
return false;
} else {
// If the type of keys is not STRING, convert it to string.
scoped_ptr<base::Value> key(PopDataAsValue(&entry_reader));
if (!key.get())
return false;
// Use JSONWriter to convert an arbitrary value to a string.
base::JSONWriter::Write(key.get(), &key_string);
}
// Get the value and set the key-value pair.
base::Value* value = PopDataAsValue(&entry_reader);
if (!value)
return false;
dictionary_value->SetWithoutPathExpansion(key_string, value);
}
return true;
}
// Gets the D-Bus type signature for the value.
std::string GetTypeSignature(const base::Value& value) {
switch (value.GetType()) {
case base::Value::TYPE_BOOLEAN:
return "b";
case base::Value::TYPE_INTEGER:
return "i";
case base::Value::TYPE_DOUBLE:
return "d";
case base::Value::TYPE_STRING:
return "s";
case base::Value::TYPE_BINARY:
return "ay";
case base::Value::TYPE_DICTIONARY:
return "a{sv}";
default:
DLOG(ERROR) << "Unexpected type " << value.GetType();
return "";
}
}
} // namespace
base::Value* PopDataAsValue(MessageReader* reader) {
base::Value* result = NULL;
switch (reader->GetDataType()) {
case Message::INVALID_DATA:
// Do nothing.
break;
case Message::BYTE: {
uint8 value = 0;
if (reader->PopByte(&value))
result = new base::FundamentalValue(value);
break;
}
case Message::BOOL: {
bool value = false;
if (reader->PopBool(&value))
result = new base::FundamentalValue(value);
break;
}
case Message::INT16: {
int16 value = 0;
if (reader->PopInt16(&value))
result = new base::FundamentalValue(value);
break;
}
case Message::UINT16: {
uint16 value = 0;
if (reader->PopUint16(&value))
result = new base::FundamentalValue(value);
break;
}
case Message::INT32: {
int32 value = 0;
if (reader->PopInt32(&value))
result = new base::FundamentalValue(value);
break;
}
case Message::UINT32: {
uint32 value = 0;
if (reader->PopUint32(&value))
result = new base::FundamentalValue(static_cast<double>(value));
break;
}
case Message::INT64: {
int64 value = 0;
if (reader->PopInt64(&value)) {
DLOG_IF(WARNING, !IsExactlyRepresentableByDouble(value)) <<
value << " is not exactly representable by double";
result = new base::FundamentalValue(static_cast<double>(value));
}
break;
}
case Message::UINT64: {
uint64 value = 0;
if (reader->PopUint64(&value)) {
DLOG_IF(WARNING, !IsExactlyRepresentableByDouble(value)) <<
value << " is not exactly representable by double";
result = new base::FundamentalValue(static_cast<double>(value));
}
break;
}
case Message::DOUBLE: {
double value = 0;
if (reader->PopDouble(&value))
result = new base::FundamentalValue(value);
break;
}
case Message::STRING: {
std::string value;
if (reader->PopString(&value))
result = new base::StringValue(value);
break;
}
case Message::OBJECT_PATH: {
ObjectPath value;
if (reader->PopObjectPath(&value))
result = new base::StringValue(value.value());
break;
}
case Message::UNIX_FD: {
// Cannot distinguish a file descriptor from an int
NOTREACHED();
break;
}
case Message::ARRAY: {
MessageReader sub_reader(NULL);
if (reader->PopArray(&sub_reader)) {
// If the type of the array's element is DICT_ENTRY, create a
// DictionaryValue, otherwise create a ListValue.
if (sub_reader.GetDataType() == Message::DICT_ENTRY) {
scoped_ptr<base::DictionaryValue> dictionary_value(
new base::DictionaryValue);
if (PopDictionaryEntries(&sub_reader, dictionary_value.get()))
result = dictionary_value.release();
} else {
scoped_ptr<base::ListValue> list_value(new base::ListValue);
if (PopListElements(&sub_reader, list_value.get()))
result = list_value.release();
}
}
break;
}
case Message::STRUCT: {
MessageReader sub_reader(NULL);
if (reader->PopStruct(&sub_reader)) {
scoped_ptr<base::ListValue> list_value(new base::ListValue);
if (PopListElements(&sub_reader, list_value.get()))
result = list_value.release();
}
break;
}
case Message::DICT_ENTRY:
// DICT_ENTRY must be popped as an element of an array.
NOTREACHED();
break;
case Message::VARIANT: {
MessageReader sub_reader(NULL);
if (reader->PopVariant(&sub_reader))
result = PopDataAsValue(&sub_reader);
break;
}
}
return result;
}
void AppendBasicTypeValueData(MessageWriter* writer, const base::Value& value) {
switch (value.GetType()) {
case base::Value::TYPE_BOOLEAN: {
bool bool_value = false;
bool success = value.GetAsBoolean(&bool_value);
DCHECK(success);
writer->AppendBool(bool_value);
break;
}
case base::Value::TYPE_INTEGER: {
int int_value = 0;
bool success = value.GetAsInteger(&int_value);
DCHECK(success);
writer->AppendInt32(int_value);
break;
}
case base::Value::TYPE_DOUBLE: {
double double_value = 0;
bool success = value.GetAsDouble(&double_value);
DCHECK(success);
writer->AppendDouble(double_value);
break;
}
case base::Value::TYPE_STRING: {
std::string string_value;
bool success = value.GetAsString(&string_value);
DCHECK(success);
writer->AppendString(string_value);
break;
}
default:
DLOG(ERROR) << "Unexpected type " << value.GetType();
break;
}
}
void AppendBasicTypeValueDataAsVariant(MessageWriter* writer,
const base::Value& value) {
MessageWriter sub_writer(NULL);
writer->OpenVariant(GetTypeSignature(value), &sub_writer);
AppendBasicTypeValueData(&sub_writer, value);
writer->CloseContainer(&sub_writer);
}
} // namespace dbus
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