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/*
* Copyright (C) 2021 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 "DaemonCoders.h"
namespace WebKit::Daemon {
class Decoder {
public:
Decoder(std::span<const uint8_t> buffer)
: m_buffer(buffer) { }
~Decoder();
template<typename T>
Decoder& operator>>(std::optional<T>& t)
{
t = decode<T>();
return *this;
}
template<typename T>
std::optional<T> decode()
{
return Coder<std::remove_cvref_t<T>>::decode(*this);
}
template<typename T>
WARN_UNUSED_RETURN bool bufferIsLargeEnoughToContain(size_t numElements) const
{
static_assert(std::is_arithmetic<T>::value, "Type T must have a fixed, known encoded size!");
if (numElements > std::numeric_limits<size_t>::max() / sizeof(T))
return false;
return bufferIsLargeEnoughToContainBytes(numElements * sizeof(T));
}
WARN_UNUSED_RETURN bool decodeFixedLengthData(std::span<uint8_t> data);
std::span<const uint8_t> decodeFixedLengthReference(size_t);
private:
WARN_UNUSED_RETURN bool bufferIsLargeEnoughToContainBytes(size_t) const;
std::span<const uint8_t> m_buffer;
size_t m_bufferPosition { 0 };
};
} // namespace WebKit::Daemon
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