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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "Decoder.h"
#include "Encoder.h"
#include <WebCore/NotificationData.h>
#include <wtf/EnumTraits.h>
#include <wtf/Span.h>
namespace IPC {
namespace Detail {
template<typename T, typename I> auto TestLegacyDecoder(int) -> decltype(I::decode(std::declval<Decoder&>(), std::declval<T&>()), std::true_type { });
template<typename T, typename I> auto TestLegacyDecoder(long) -> std::false_type;
template<typename T, typename I> auto TestModernDecoder(int) -> decltype(I::decode(std::declval<Decoder&>()), std::true_type { });
template<typename T, typename I> auto TestModernDecoder(long) -> std::false_type;
}
template<typename T, typename I = T> struct HasLegacyDecoder : decltype(Detail::TestLegacyDecoder<T, I>(0)) { };
template<typename T, typename I = T> inline constexpr bool HasLegacyDecoderV = HasLegacyDecoder<T, I>::value;
template<typename T, typename I = T> struct HasModernDecoder : decltype(Detail::TestModernDecoder<T, I>(0)) { };
template<typename T, typename I = T> inline constexpr bool HasModernDecoderV = HasModernDecoder<T, I>::value;
template<typename T, typename = void> struct ArgumentCoder {
template<typename Encoder>
static void encode(Encoder& encoder, const T& t)
{
t.encode(encoder);
}
template<typename Encoder>
static void encode(Encoder& encoder, T&& t)
{
WTFMove(t).encode(encoder);
}
template<typename Decoder>
static std::optional<T> decode(Decoder& decoder)
{
if constexpr(HasModernDecoderV<T>)
return T::decode(decoder);
else {
T t;
if (T::decode(decoder, t))
return t;
return std::nullopt;
}
}
static WARN_UNUSED_RETURN bool decode(Decoder& decoder, T& t)
{
if constexpr(HasLegacyDecoderV<T>)
return T::decode(decoder, t);
else {
std::optional<T> optional = T::decode(decoder);
if (!optional)
return false;
t = WTFMove(*optional);
return true;
}
}
};
template<>
struct ArgumentCoder<bool> {
template<typename Encoder>
static void encode(Encoder& encoder, bool value)
{
uint8_t data = value ? 1 : 0;
encoder << data;
}
template<typename Decoder>
static std::optional<bool> decode(Decoder& decoder)
{
uint8_t data;
if (decoder.decodeFixedLengthData(&data, sizeof(uint8_t), alignof(uint8_t)) && data <= 1)
return !!data; // This ensures that only the lower bit is set in a boolean for IPC messages
return std::nullopt;
}
};
template<typename T>
struct ArgumentCoder<T, typename std::enable_if_t<std::is_arithmetic_v<T>>> {
template<typename Encoder>
static void encode(Encoder& encoder, T value)
{
encoder.encodeFixedLengthData(reinterpret_cast<const uint8_t*>(&value), sizeof(T), alignof(T));
}
template<typename Decoder>
static std::optional<T> decode(Decoder& decoder)
{
T result;
if (decoder.decodeFixedLengthData(reinterpret_cast<uint8_t*>(&result), sizeof(T), alignof(T)))
return result;
return std::nullopt;
}
};
template<typename T>
struct ArgumentCoder<T, typename std::enable_if_t<std::is_enum_v<T>>> {
template<typename Encoder>
static void encode(Encoder& encoder, T value)
{
ASSERT(WTF::isValidEnum<T>(WTF::enumToUnderlyingType<T>(value)));
encoder << WTF::enumToUnderlyingType<T>(value);
}
template<typename Decoder>
static std::optional<T> decode(Decoder& decoder)
{
std::optional<std::underlying_type_t<T>> value;
decoder >> value;
if (value && WTF::isValidEnum<T>(*value))
return static_cast<T>(*value);
return std::nullopt;
}
};
}
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