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/**
* Copyright © 2018 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <array>
#include <ipmid/message/types.hpp>
#include <memory>
#include <optional>
#include <phosphor-logging/log.hpp>
#include <string_view>
#include <tuple>
#include <utility>
#include <variant>
#include <vector>
namespace ipmi
{
namespace message
{
namespace details
{
/**************************************
* ipmi return type helpers
**************************************/
template <typename NumericType, size_t byteIndex = 0>
void PackBytes(uint8_t* pointer, const NumericType& i)
{
if constexpr (byteIndex < sizeof(NumericType))
{
*pointer = static_cast<uint8_t>(i >> (8 * byteIndex));
PackBytes<NumericType, byteIndex + 1>(pointer + 1, i);
}
}
template <typename NumericType, size_t byteIndex = 0>
void PackBytesUnaligned(Payload& p, const NumericType& i)
{
if constexpr (byteIndex < sizeof(NumericType))
{
p.appendBits(CHAR_BIT, static_cast<uint8_t>(i >> (8 * byteIndex)));
PackBytesUnaligned<NumericType, byteIndex + 1>(p, i);
}
}
/** @struct PackSingle
* @brief Utility to pack a single C++ element into a Payload
*
* User-defined types are expected to specialize this template in order to
* get their functionality.
*
* @tparam S - Type of element to pack.
*/
template <typename T>
struct PackSingle
{
/** @brief Do the operation to pack element.
*
* @param[in] p - Payload to pack into.
* @param[out] t - The reference to pack item into.
*/
static int op(Payload& p, const T& t)
{
static_assert(std::is_integral_v<T>,
"Attempt to pack a type that has no IPMI pack operation");
// if not on a byte boundary, must pack values LSbit/LSByte first
if (p.bitCount)
{
PackBytesUnaligned<T>(p, t);
}
else
{
// copy in bits to vector....
p.raw.resize(p.raw.size() + sizeof(T));
uint8_t* out = p.raw.data() + p.raw.size() - sizeof(T);
PackBytes<T>(out, t);
}
return 0;
}
};
/** @brief Specialization of PackSingle for std::tuple<T> */
template <typename... T>
struct PackSingle<std::tuple<T...>>
{
static int op(Payload& p, const std::tuple<T...>& v)
{
return std::apply([&p](const T&... args) { return p.pack(args...); },
v);
}
};
/** @brief Specialization of PackSingle for std::string
* represented as a UCSD-Pascal style string
*/
template <>
struct PackSingle<std::string>
{
static int op(Payload& p, const std::string& t)
{
// check length first
uint8_t len;
if (t.length() > std::numeric_limits<decltype(len)>::max())
{
using namespace phosphor::logging;
log<level::ERR>("long string truncated on IPMI message pack");
return 1;
}
len = static_cast<uint8_t>(t.length());
PackSingle<uint8_t>::op(p, len);
p.append(t.c_str(), t.c_str() + t.length());
return 0;
}
};
/** @brief Specialization of PackSingle for fixed_uint_t types
*/
template <unsigned N>
struct PackSingle<fixed_uint_t<N>>
{
static int op(Payload& p, const fixed_uint_t<N>& t)
{
size_t count = N;
static_assert(N <= (details::bitStreamSize - CHAR_BIT));
uint64_t bits = t;
while (count > 0)
{
size_t appendCount = std::min(count, static_cast<size_t>(CHAR_BIT));
p.appendBits(appendCount, static_cast<uint8_t>(bits));
bits >>= CHAR_BIT;
count -= appendCount;
}
return 0;
}
};
/** @brief Specialization of PackSingle for bool. */
template <>
struct PackSingle<bool>
{
static int op(Payload& p, const bool& b)
{
p.appendBits(1, b);
return 0;
}
};
/** @brief Specialization of PackSingle for std::bitset<N> */
template <size_t N>
struct PackSingle<std::bitset<N>>
{
static int op(Payload& p, const std::bitset<N>& t)
{
size_t count = N;
static_assert(N <= (details::bitStreamSize - CHAR_BIT));
unsigned long long bits = t.to_ullong();
while (count > 0)
{
size_t appendCount = std::min(count, size_t(CHAR_BIT));
p.appendBits(appendCount, static_cast<uint8_t>(bits));
bits >>= CHAR_BIT;
count -= appendCount;
}
return 0;
}
};
/** @brief Specialization of PackSingle for std::optional<T> */
template <typename T>
struct PackSingle<std::optional<T>>
{
static int op(Payload& p, const std::optional<T>& t)
{
int ret = 0;
if (t)
{
ret = PackSingle<T>::op(p, *t);
}
return ret;
}
};
/** @brief Specialization of PackSingle for std::array<T, N> */
template <typename T, size_t N>
struct PackSingle<std::array<T, N>>
{
static int op(Payload& p, const std::array<T, N>& t)
{
int ret = 0;
for (const auto& v : t)
{
int ret = PackSingle<T>::op(p, v);
if (ret)
{
break;
}
}
return ret;
}
};
/** @brief Specialization of PackSingle for std::vector<T> */
template <typename T>
struct PackSingle<std::vector<T>>
{
static int op(Payload& p, const std::vector<T>& t)
{
int ret = 0;
for (const auto& v : t)
{
int ret = PackSingle<T>::op(p, v);
if (ret)
{
break;
}
}
return ret;
}
};
/** @brief Specialization of PackSingle for std::vector<uint8_t> */
template <>
struct PackSingle<std::vector<uint8_t>>
{
static int op(Payload& p, const std::vector<uint8_t>& t)
{
if (p.bitCount != 0)
{
return 1;
}
p.raw.reserve(p.raw.size() + t.size());
p.raw.insert(p.raw.end(), t.begin(), t.end());
return 0;
}
};
/** @brief Specialization of PackSingle for std::string_view */
template <>
struct PackSingle<std::string_view>
{
static int op(Payload& p, const std::string_view& t)
{
if (p.bitCount != 0)
{
return 1;
}
p.raw.reserve(p.raw.size() + t.size());
p.raw.insert(p.raw.end(), t.begin(), t.end());
return 0;
}
};
/** @brief Specialization of PackSingle for std::variant<T, N> */
template <typename... T>
struct PackSingle<std::variant<T...>>
{
static int op(Payload& p, const std::variant<T...>& v)
{
return std::visit(
[&p](const auto& arg) {
return PackSingle<std::decay_t<decltype(arg)>>::op(p, arg);
},
v);
}
};
/** @brief Specialization of PackSingle for Payload */
template <>
struct PackSingle<Payload>
{
static int op(Payload& p, const Payload& t)
{
if (p.bitCount != 0 || t.bitCount != 0)
{
return 1;
}
p.raw.reserve(p.raw.size() + t.raw.size());
p.raw.insert(p.raw.end(), t.raw.begin(), t.raw.end());
return 0;
}
};
} // namespace details
} // namespace message
} // namespace ipmi
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