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/*
* Copyright (C) 2022 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 "ArgumentCoders.h"
#include <optional>
#include <wtf/Forward.h>
#include <wtf/StdLibExtras.h>
#include <wtf/URL.h>
#include <wtf/UUID.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
struct ExceptionData;
class CertificateInfo;
class PrivateClickMeasurement;
class RegistrableDomain;
namespace PCM {
struct AttributionTimeToSendData;
struct AttributionTriggerData;
struct EphemeralNonce;
}
}
namespace WebKit {
namespace Daemon {
class Encoder;
class Decoder;
template<typename T, typename = void> struct Coder;
template<typename T> struct Coder<T, typename std::enable_if_t<std::is_arithmetic_v<T>>> {
template<typename Encoder> static void encode(Encoder& encoder, T value)
{
encoder.encodeFixedLengthData(asByteSpan(value));
}
template<typename Decoder> static std::optional<T> decode(Decoder& decoder)
{
if (T result; decoder.decodeFixedLengthData(asMutableByteSpan(result)))
return result;
return std::nullopt;
}
};
template<typename T, size_t inlineCapacity, typename OverflowHandler, size_t minCapacity> struct Coder<Vector<T, inlineCapacity, OverflowHandler, minCapacity>> {
template<typename Encoder> static void encode(Encoder& encoder, const Vector<T, inlineCapacity, OverflowHandler, minCapacity>& vector)
{
encoder << static_cast<uint64_t>(vector.size());
for (size_t i = 0; i < vector.size(); ++i)
encoder << vector[i];
}
template<typename Decoder> static std::optional<Vector<T, inlineCapacity, OverflowHandler, minCapacity>> decode(Decoder& decoder)
{
std::optional<uint64_t> size;
decoder >> size;
if (!size)
return std::nullopt;
Vector<T, inlineCapacity, OverflowHandler, minCapacity> vector;
for (size_t i = 0; i < *size; ++i) {
std::optional<T> element;
decoder >> element;
if (!element)
return std::nullopt;
vector.append(WTFMove(*element));
}
vector.shrinkToFit();
return vector;
}
};
template<typename T> struct Coder<T, typename std::enable_if_t<std::is_enum_v<T>>> : public IPC::ArgumentCoder<T> { };
template<typename T> struct Coder<std::optional<T>> : public IPC::ArgumentCoder<std::optional<T>> { };
template<typename ValueType, typename ErrorType> struct Coder<Expected<ValueType, ErrorType>> : IPC::ArgumentCoder<Expected<ValueType, ErrorType>> { };
template<typename... Elements> struct Coder<std::tuple<Elements...>> : public IPC::ArgumentCoder<std::tuple<Elements...>> { };
#define DECLARE_CODER(class) \
template<> struct Coder<class> { \
static void encode(Encoder&, const class&); \
static std::optional<class> decode(Decoder&); \
}
DECLARE_CODER(WebCore::CertificateInfo);
DECLARE_CODER(WebCore::PrivateClickMeasurement);
DECLARE_CODER(WebCore::PCM::AttributionTriggerData);
DECLARE_CODER(WebCore::RegistrableDomain);
DECLARE_CODER(WTF::WallTime);
#undef DECLARE_CODER
template<> struct Coder<WTF::URL> {
template<typename Encoder>
static void encode(Encoder& encoder, const WTF::URL& instance)
{
encoder << instance.string();
}
template<typename Decoder>
static std::optional<WTF::URL> decode(Decoder& decoder)
{
std::optional<String> string;
decoder >> string;
if (!string)
return std::nullopt;
return { WTF::URL(WTFMove(*string)) };
}
};
template<> struct Coder<WTF::String> {
template<typename Encoder>
static void encode(Encoder& encoder, const WTF::String& string)
{
// Special case the null string.
if (string.isNull()) {
encoder << std::numeric_limits<uint32_t>::max();
return;
}
bool is8Bit = string.is8Bit();
encoder << string.length() << is8Bit;
if (is8Bit)
encoder.encodeFixedLengthData(string.span8());
else
encoder.encodeFixedLengthData(asBytes(string.span16()));
}
template<typename CharacterType, typename Decoder>
static std::optional<String> decodeStringText(Decoder& decoder, uint32_t length)
{
// Before allocating the string, make sure that the decoder buffer is big enough.
if (!decoder.template bufferIsLargeEnoughToContain<CharacterType>(length))
return std::nullopt;
std::span<CharacterType> buffer;
String string = String::createUninitialized(length, buffer);
if (!decoder.decodeFixedLengthData(asMutableByteSpan(buffer)))
return std::nullopt;
return string;
}
template<typename Decoder>
static std::optional<WTF::String> decode(Decoder& decoder)
{
std::optional<uint32_t> length;
decoder >> length;
if (!length)
return std::nullopt;
if (*length == std::numeric_limits<uint32_t>::max()) {
// This is the null string.
return String();
}
std::optional<bool> is8Bit;
decoder >> is8Bit;
if (!is8Bit)
return std::nullopt;
if (*is8Bit)
return decodeStringText<LChar>(decoder, *length);
return decodeStringText<UChar>(decoder, *length);
}
};
} // namespace Daemon
} // namespace WebKit
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