| // 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}"; |
| case base::Value::TYPE_LIST: |
| return "av"; |
| default: |
| DLOG(ERROR) << "Unexpected type " << value.GetType(); |
| return std::string(); |
| } |
| } |
| |
| } // 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); |
| } |
| |
| void AppendValueData(MessageWriter* writer, const base::Value& value) { |
| switch (value.GetType()) { |
| case base::Value::TYPE_DICTIONARY: { |
| const base::DictionaryValue* dictionary = NULL; |
| value.GetAsDictionary(&dictionary); |
| dbus::MessageWriter array_writer(NULL); |
| writer->OpenArray("{sv}", &array_writer); |
| for (base::DictionaryValue::Iterator iter(*dictionary); |
| !iter.IsAtEnd(); iter.Advance()) { |
| dbus::MessageWriter dict_entry_writer(NULL); |
| array_writer.OpenDictEntry(&dict_entry_writer); |
| dict_entry_writer.AppendString(iter.key()); |
| AppendValueDataAsVariant(&dict_entry_writer, iter.value()); |
| array_writer.CloseContainer(&dict_entry_writer); |
| } |
| writer->CloseContainer(&array_writer); |
| break; |
| } |
| case base::Value::TYPE_LIST: { |
| const base::ListValue* list = NULL; |
| value.GetAsList(&list); |
| dbus::MessageWriter array_writer(NULL); |
| writer->OpenArray("v", &array_writer); |
| for (base::ListValue::const_iterator iter = list->begin(); |
| iter != list->end(); ++iter) { |
| const base::Value* value = *iter; |
| AppendValueDataAsVariant(&array_writer, *value); |
| } |
| writer->CloseContainer(&array_writer); |
| break; |
| } |
| case base::Value::TYPE_BOOLEAN: |
| case base::Value::TYPE_INTEGER: |
| case base::Value::TYPE_DOUBLE: |
| case base::Value::TYPE_STRING: |
| AppendBasicTypeValueData(writer, value); |
| break; |
| default: |
| DLOG(ERROR) << "Unexpected type: " << value.GetType(); |
| } |
| } |
| |
| void AppendValueDataAsVariant(MessageWriter* writer, const base::Value& value) { |
| MessageWriter variant_writer(NULL); |
| writer->OpenVariant(GetTypeSignature(value), &variant_writer); |
| AppendValueData(&variant_writer, value); |
| writer->CloseContainer(&variant_writer); |
| } |
| |
| } // namespace dbus |
