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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/Forward.h>
#include <AK/NumericLimits.h>
#include <AK/StdLibExtras.h>
#include <AK/String.h>
#include <AK/Try.h>
#include <LibCore/SharedCircularQueue.h>
#include <LibCore/Stream.h>
#include <LibIPC/File.h>
#include <LibIPC/Forward.h>
#include <LibIPC/Message.h>
namespace IPC {
template<typename T>
inline ErrorOr<void> decode(Decoder&, T&)
{
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)
{
}
ErrorOr<void> decode(bool&);
ErrorOr<void> decode(u8&);
ErrorOr<void> decode(u16&);
ErrorOr<void> decode(unsigned&);
ErrorOr<void> decode(unsigned long&);
ErrorOr<void> decode(unsigned long long&);
ErrorOr<void> decode(i8&);
ErrorOr<void> decode(i16&);
ErrorOr<void> decode(i32&);
ErrorOr<void> decode(i64&);
ErrorOr<void> decode(float&);
ErrorOr<void> decode(double&);
ErrorOr<void> decode(String&);
ErrorOr<void> decode(ByteBuffer&);
ErrorOr<void> decode(URL&);
ErrorOr<void> decode(Dictionary&);
ErrorOr<void> decode(File&);
template<typename K, typename V>
ErrorOr<void> decode(HashMap<K, V>& hashmap)
{
u32 size;
TRY(decode(size));
if (size > NumericLimits<i32>::max())
return Error::from_string_literal("IPC: Invalid HashMap size"sv);
for (size_t i = 0; i < size; ++i) {
K key;
TRY(decode(key));
V value;
TRY(decode(value));
TRY(hashmap.try_set(move(key), move(value)));
}
return {};
}
template<typename K, typename V>
ErrorOr<void> decode(OrderedHashMap<K, V>& hashmap)
{
u32 size;
TRY(decode(size));
if (size > NumericLimits<i32>::max())
return Error::from_string_literal("IPC: Invalid HashMap size"sv);
for (size_t i = 0; i < size; ++i) {
K key;
TRY(decode(key));
V value;
TRY(decode(value));
TRY(hashmap.try_set(move(key), move(value)));
}
return {};
}
template<Enum T>
ErrorOr<void> decode(T& enum_value)
{
UnderlyingType<T> inner_value;
TRY(decode(inner_value));
enum_value = T(inner_value);
return {};
}
template<typename T>
ErrorOr<void> decode(T& value)
{
return IPC::decode(*this, value);
}
template<typename T>
ErrorOr<void> decode(Vector<T>& vector)
{
u64 size;
TRY(decode(size));
if (size > NumericLimits<i32>::max())
return Error::from_string_literal("IPC: Invalid Vector size"sv);
VERIFY(vector.is_empty());
TRY(vector.try_ensure_capacity(size));
for (size_t i = 0; i < size; ++i) {
T value;
TRY(decode(value));
vector.template unchecked_append(move(value));
}
return {};
}
template<typename T, size_t Size>
ErrorOr<void> decode(Core::SharedSingleProducerCircularQueue<T, Size>& queue)
{
// FIXME: We don't support decoding into valid queues.
VERIFY(!queue.is_valid());
IPC::File anon_file;
TRY(decode(anon_file));
queue = TRY((Core::SharedSingleProducerCircularQueue<T, Size>::try_create(anon_file.take_fd())));
return {};
}
template<typename T>
ErrorOr<void> decode(Optional<T>& optional)
{
bool has_value;
TRY(decode(has_value));
if (!has_value) {
optional = {};
return {};
}
T value;
TRY(decode(value));
optional = move(value);
return {};
}
private:
InputMemoryStream& m_stream;
Core::Stream::LocalSocket& m_socket;
};
}
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