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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Concepts.h>
#include <AK/HashMap.h>
#include <AK/StdLibExtras.h>
#include <AK/Variant.h>
#include <LibCore/SharedCircularQueue.h>
#include <LibIPC/Concepts.h>
#include <LibIPC/Forward.h>
#include <LibIPC/Message.h>
namespace IPC {
template<typename T>
ErrorOr<void> encode(Encoder&, T const&)
{
static_assert(DependentFalse<T>, "Base IPC::encode() was instantiated");
VERIFY_NOT_REACHED();
}
class Encoder {
public:
explicit Encoder(MessageBuffer& buffer)
: m_buffer(buffer)
{
}
template<typename T>
ErrorOr<void> encode(T const& value);
ErrorOr<void> extend_capacity(size_t capacity)
{
return m_buffer.data.try_ensure_capacity(m_buffer.data.size() + capacity);
}
void append(u8 value)
{
m_buffer.data.unchecked_append(value);
}
ErrorOr<void> append(u8 const* values, size_t count)
{
TRY(extend_capacity(count));
m_buffer.data.unchecked_append(values, count);
return {};
}
ErrorOr<void> append_file_descriptor(int fd)
{
auto auto_fd = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) AutoCloseFileDescriptor(fd)));
return m_buffer.fds.try_append(move(auto_fd));
}
ErrorOr<void> encode_size(size_t size);
private:
MessageBuffer& m_buffer;
};
template<Arithmetic T>
ErrorOr<void> encode(Encoder& encoder, T const& value)
{
TRY(encoder.extend_capacity(sizeof(T)));
if constexpr (sizeof(T) == 1) {
encoder.append(static_cast<u8>(value));
} else if constexpr (sizeof(T) == 2) {
encoder.append(static_cast<u8>(value));
encoder.append(static_cast<u8>(value >> 8));
} else if constexpr (sizeof(T) == 4) {
encoder.append(static_cast<u8>(value));
encoder.append(static_cast<u8>(value >> 8));
encoder.append(static_cast<u8>(value >> 16));
encoder.append(static_cast<u8>(value >> 24));
} else if constexpr (sizeof(T) == 8) {
encoder.append(static_cast<u8>(value));
encoder.append(static_cast<u8>(value >> 8));
encoder.append(static_cast<u8>(value >> 16));
encoder.append(static_cast<u8>(value >> 24));
encoder.append(static_cast<u8>(value >> 32));
encoder.append(static_cast<u8>(value >> 40));
encoder.append(static_cast<u8>(value >> 48));
encoder.append(static_cast<u8>(value >> 56));
} else {
static_assert(DependentFalse<T>);
}
return {};
}
template<Enum T>
ErrorOr<void> encode(Encoder& encoder, T const& value)
{
return encoder.encode(to_underlying(value));
}
template<>
ErrorOr<void> encode(Encoder&, float const&);
template<>
ErrorOr<void> encode(Encoder&, double const&);
template<>
ErrorOr<void> encode(Encoder&, StringView const&);
template<>
ErrorOr<void> encode(Encoder&, DeprecatedString const&);
template<>
ErrorOr<void> encode(Encoder&, ByteBuffer const&);
template<>
ErrorOr<void> encode(Encoder&, JsonValue const&);
template<>
ErrorOr<void> encode(Encoder&, URL const&);
template<>
ErrorOr<void> encode(Encoder&, Dictionary const&);
template<>
ErrorOr<void> encode(Encoder&, File const&);
template<>
ErrorOr<void> encode(Encoder&, Empty const&);
template<Concepts::Vector T>
ErrorOr<void> encode(Encoder& encoder, T const& vector)
{
// NOTE: Do not change this encoding without also updating LibC/netdb.cpp.
TRY(encoder.encode_size(vector.size()));
for (auto const& value : vector)
TRY(encoder.encode(value));
return {};
}
template<Concepts::HashMap T>
ErrorOr<void> encode(Encoder& encoder, T const& hashmap)
{
TRY(encoder.encode_size(hashmap.size()));
for (auto it : hashmap) {
TRY(encoder.encode(it.key));
TRY(encoder.encode(it.value));
}
return {};
}
template<Concepts::SharedSingleProducerCircularQueue T>
ErrorOr<void> encode(Encoder& encoder, T const& queue)
{
return encoder.encode(IPC::File { queue.fd() });
}
template<Concepts::Optional T>
ErrorOr<void> encode(Encoder& encoder, T const& optional)
{
TRY(encoder.encode(optional.has_value()));
if (optional.has_value())
TRY(encoder.encode(optional.value()));
return {};
}
template<Concepts::Variant T>
ErrorOr<void> encode(Encoder& encoder, T const& variant)
{
TRY(encoder.encode(variant.index()));
return variant.visit([&](auto const& value) {
return encoder.encode(value);
});
}
// This must be last so that it knows about the above specializations.
template<typename T>
ErrorOr<void> Encoder::encode(T const& value)
{
return IPC::encode(*this, value);
}
}
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