116 lines
4.5 KiB
C++
116 lines
4.5 KiB
C++
/*
|
|
* 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 <wtf/EnumTraits.h>
|
|
#include <wtf/SHA1.h>
|
|
#include <wtf/Span.h>
|
|
#include <wtf/Vector.h>
|
|
#include <wtf/persistence/PersistentCoder.h>
|
|
|
|
namespace WTF {
|
|
namespace Persistence {
|
|
|
|
class Encoder;
|
|
class DataReference;
|
|
|
|
class Encoder {
|
|
WTF_MAKE_FAST_ALLOCATED;
|
|
public:
|
|
WTF_EXPORT_PRIVATE Encoder();
|
|
WTF_EXPORT_PRIVATE ~Encoder();
|
|
|
|
WTF_EXPORT_PRIVATE void encodeChecksum();
|
|
WTF_EXPORT_PRIVATE void encodeFixedLengthData(Span<const uint8_t>);
|
|
|
|
template<typename T, std::enable_if_t<std::is_enum<T>::value>* = nullptr>
|
|
Encoder& operator<<(const T& t)
|
|
{
|
|
static_assert(sizeof(T) <= sizeof(uint64_t), "Enum type must not be larger than 64 bits.");
|
|
return *this << static_cast<uint64_t>(t);
|
|
}
|
|
|
|
template<typename T, std::enable_if_t<!std::is_enum<T>::value && !std::is_arithmetic<typename std::remove_const<T>>::value>* = nullptr>
|
|
Encoder& operator<<(const T& t)
|
|
{
|
|
Coder<T>::encode(*this, t);
|
|
return *this;
|
|
}
|
|
|
|
WTF_EXPORT_PRIVATE Encoder& operator<<(bool);
|
|
WTF_EXPORT_PRIVATE Encoder& operator<<(uint8_t);
|
|
WTF_EXPORT_PRIVATE Encoder& operator<<(uint16_t);
|
|
WTF_EXPORT_PRIVATE Encoder& operator<<(uint32_t);
|
|
WTF_EXPORT_PRIVATE Encoder& operator<<(uint64_t);
|
|
WTF_EXPORT_PRIVATE Encoder& operator<<(int16_t);
|
|
WTF_EXPORT_PRIVATE Encoder& operator<<(int32_t);
|
|
WTF_EXPORT_PRIVATE Encoder& operator<<(int64_t);
|
|
WTF_EXPORT_PRIVATE Encoder& operator<<(float);
|
|
WTF_EXPORT_PRIVATE Encoder& operator<<(double);
|
|
|
|
const uint8_t* buffer() const { return m_buffer.data(); }
|
|
size_t bufferSize() const { return m_buffer.size(); }
|
|
|
|
WTF_EXPORT_PRIVATE static void updateChecksumForData(SHA1&, Span<const uint8_t>);
|
|
template <typename Type> static void updateChecksumForNumber(SHA1&, Type);
|
|
|
|
static constexpr bool isIPCEncoder = false;
|
|
|
|
private:
|
|
|
|
template<typename Type> Encoder& encodeNumber(Type);
|
|
|
|
uint8_t* grow(size_t);
|
|
|
|
template <typename Type> struct Salt;
|
|
|
|
Vector<uint8_t, 4096> m_buffer;
|
|
SHA1 m_sha1;
|
|
};
|
|
|
|
template <> struct Encoder::Salt<bool> { static constexpr unsigned value = 3; };
|
|
template <> struct Encoder::Salt<uint8_t> { static constexpr unsigned value = 5; };
|
|
template <> struct Encoder::Salt<uint16_t> { static constexpr unsigned value = 7; };
|
|
template <> struct Encoder::Salt<uint32_t> { static constexpr unsigned value = 11; };
|
|
template <> struct Encoder::Salt<uint64_t> { static constexpr unsigned value = 13; };
|
|
template <> struct Encoder::Salt<int32_t> { static constexpr unsigned value = 17; };
|
|
template <> struct Encoder::Salt<int64_t> { static constexpr unsigned value = 19; };
|
|
template <> struct Encoder::Salt<float> { static constexpr unsigned value = 23; };
|
|
template <> struct Encoder::Salt<double> { static constexpr unsigned value = 29; };
|
|
template <> struct Encoder::Salt<uint8_t*> { static constexpr unsigned value = 101; };
|
|
template <> struct Encoder::Salt<int16_t> { static constexpr unsigned value = 103; };
|
|
|
|
template <typename Type>
|
|
void Encoder::updateChecksumForNumber(SHA1& sha1, Type value)
|
|
{
|
|
auto typeSalt = Salt<Type>::value;
|
|
sha1.addBytes(reinterpret_cast<uint8_t*>(&typeSalt), sizeof(typeSalt));
|
|
sha1.addBytes(reinterpret_cast<uint8_t*>(&value), sizeof(value));
|
|
}
|
|
|
|
}
|
|
}
|