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/*
* File: fix/checksum.hpp
* Purpose: Financial Information Exchange checksum in C++
* Author: Amlal El Mahrouss (amlal@nekernel.org)
* Copyright 2025, Amlal El Mahrouss, licensed under the Boost Software License.
*/
#ifndef OCL_FIX_CHECKSUM
#define OCL_FIX_CHECKSUM
#include <ocl/fix/detail/config.hpp>
#include <ocl/fix/parser.hpp>
#include <boost/core/detail/string_view.hpp>
namespace ocl::fix
{
/// \brief Returns the checksum index of a FIX message.
/// \param range the range_buffer containing the message.
/// \throws runtime_error if the FIX message is invalid (missing tag "8").
inline std::string try_index_checksum(range_buffer& fix)
{
if (fix.is_valid())
return fix["10"];
else
::ocl::fix::detail::throw_runtime_error();
::ocl::fix::detail::unreachable();
return {};
}
/// \brief FIX message operators namespace.
namespace operators
{
using checksum_type = long long;
/// \brief Calculates the FIX protocol checksum for a message.
/// \param in_ Pointer to the message buffer.
/// \param len Length of the message in bytes.
/// \return The checksum value (sum of all bytes modulo 256).
constexpr inline checksum_type
checksum(const std::string_view& in_) noexcept
{
checksum_type cks{};
for (std::size_t idx{};
idx < in_.size(); ++idx)
cks += static_cast<uint8_t>(in_[idx]);
// add \0
cks += 1;
return cks % 256;
}
} // namespace operators
} // namespace ocl::fix
#endif
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