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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Concepts.h>
#include <AK/DeprecatedString.h>
#include <AK/Forward.h>
#include <AK/MemoryStream.h>
#include <AK/NumericLimits.h>
#include <AK/StdLibExtras.h>
#include <AK/Try.h>
#include <AK/TypeList.h>
#include <AK/Variant.h>
#include <LibCore/SharedCircularQueue.h>
#include <LibCore/Stream.h>
#include <LibIPC/Concepts.h>
#include <LibIPC/File.h>
#include <LibIPC/Forward.h>
#include <LibIPC/Message.h>
namespace IPC {
template<typename T>
inline ErrorOr<T> decode(Decoder&)
{
static_assert(DependentFalse<T>, "Base IPC::decoder() instantiated");
VERIFY_NOT_REACHED();
}
class Decoder {
public:
Decoder(InputMemoryStream& stream, Core::Stream::LocalSocket& socket)
: m_stream(stream)
, m_socket(socket)
{
}
template<typename T>
ErrorOr<T> decode();
template<typename T>
ErrorOr<void> decode_into(T& value)
{
m_stream >> value;
TRY(m_stream.try_handle_any_error());
return {};
}
Core::Stream::LocalSocket& socket() { return m_socket; }
private:
InputMemoryStream& m_stream;
Core::Stream::LocalSocket& m_socket;
};
template<Arithmetic T>
ErrorOr<T> decode(Decoder& decoder)
{
T value { 0 };
TRY(decoder.decode_into(value));
return value;
}
template<Enum T>
ErrorOr<T> decode(Decoder& decoder)
{
auto value = TRY(decoder.decode<UnderlyingType<T>>());
return static_cast<T>(value);
}
template<>
ErrorOr<DeprecatedString> decode(Decoder&);
template<>
ErrorOr<ByteBuffer> decode(Decoder&);
template<>
ErrorOr<JsonValue> decode(Decoder&);
template<>
ErrorOr<URL> decode(Decoder&);
template<>
ErrorOr<Dictionary> decode(Decoder&);
template<>
ErrorOr<File> decode(Decoder&);
template<>
ErrorOr<Empty> decode(Decoder&);
template<Concepts::Vector T>
ErrorOr<T> decode(Decoder& decoder)
{
auto size = TRY(decoder.decode<u64>());
if (size > NumericLimits<i32>::max())
return Error::from_string_literal("IPC: Invalid Vector size");
T vector;
TRY(vector.try_ensure_capacity(size));
for (size_t i = 0; i < size; ++i) {
auto value = TRY(decoder.decode<typename T::ValueType>());
vector.template unchecked_append(move(value));
}
return vector;
}
template<Concepts::HashMap T>
ErrorOr<T> decode(Decoder& decoder)
{
auto size = TRY(decoder.decode<u32>());
if (size > NumericLimits<i32>::max())
return Error::from_string_literal("IPC: Invalid HashMap size");
T hashmap;
for (size_t i = 0; i < size; ++i) {
auto key = TRY(decoder.decode<typename T::KeyType>());
auto value = TRY(decoder.decode<typename T::ValueType>());
TRY(hashmap.try_set(move(key), move(value)));
}
return hashmap;
}
template<Concepts::SharedSingleProducerCircularQueue T>
ErrorOr<T> decode(Decoder& decoder)
{
auto anon_file = TRY(decoder.decode<IPC::File>());
return T::try_create(anon_file.take_fd());
}
template<Concepts::Optional T>
ErrorOr<T> decode(Decoder& decoder)
{
if (auto has_value = TRY(decoder.decode<bool>()); !has_value)
return T {};
return T { TRY(decoder.decode<typename T::ValueType>()) };
}
namespace Detail {
template<Concepts::Variant T, size_t Index = 0>
ErrorOr<T> decode_variant(Decoder& decoder, size_t index)
{
using ElementList = TypeList<T>;
if constexpr (Index < ElementList::size) {
if (index == Index) {
using ElementType = typename ElementList::template Type<Index>;
return T { TRY(decoder.decode<ElementType>()) };
}
return decode_variant<T, Index + 1>(decoder, index);
} else {
VERIFY_NOT_REACHED();
}
}
}
template<Concepts::Variant T>
ErrorOr<T> decode(Decoder& decoder)
{
auto index = TRY(decoder.decode<typename T::IndexType>());
return Detail::decode_variant<T>(decoder, index);
}
// This must be last so that it knows about the above specializations.
template<typename T>
ErrorOr<T> Decoder::decode()
{
return IPC::decode<T>(*this);
}
}
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