Get SMBIOS UUID (WinAPI, C++ 17, Boost)

BiosUUID.h

// SPDX-License-Identifier: MIT
// MIT Software License: https://opensource.org/licenses/MIT
// Copyright Vadim Piven <vadim@piven.tech>

#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_io.hpp>

#include <algorithm>
#include <functional>
#include <iterator>
#include <string>
#include <vector>

#include <sysinfoapi.h>
#include <Windows.h>

[[nodiscard]] std::string GetBiosUuid()
{
    // https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getsystemfirmwaretable
    struct RawSMBIOSData
    {
        BYTE Used20CallingMethod;
        BYTE SMBIOSMajorVersion;
        BYTE SMBIOSMinorVersion;
        BYTE DmiRevision;
        DWORD Length;
        BYTE SMBIOSTableData[1];
    };

    // https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.7.0.pdf
    enum class StructureType : BYTE
    {
        SystemInformation = 0x01,
    };

    // para 6.1.2
    struct Header
    {
        StructureType type;
        BYTE length;
        WORD handle;
    };

    // para 7.2
    struct SystemInformation : Header
    {
        BYTE manufacturer;
        BYTE productName;
        BYTE version;
        BYTE serialNumber;
        BYTE uuid[16];
    };

    // para 6.1.1
    BYTE constexpr Terminator[] = {0x00, 0x00};

    std::vector<BYTE> buffer(::GetSystemFirmwareTable('RSMB', 0, nullptr, 0));
    (void)::GetSystemFirmwareTable('RSMB', 0, buffer.data(), static_cast<DWORD>(buffer.size()));

    const auto rawData = reinterpret_cast<RawSMBIOSData const *>(buffer.data());
    for (auto it = rawData->SMBIOSTableData, itEnd = it + rawData->Length; it < itEnd;)
    {
        switch (auto const header = reinterpret_cast<Header const *>(it); header->type)
        {
        default: // skip structure
        {
            it = std::search(it + header->length, itEnd, std::begin(Terminator), std::end(Terminator))
                + sizeof(Terminator);
            continue;
        }
        case StructureType::SystemInformation:
        {
            if (header->length >= sizeof(SystemInformation)) // UUID field supported on this SMBIOS version
            {
                auto const uuid = static_cast<SystemInformation const *>(header)->uuid;
                auto const correctUuid = boost::uuids::uuid{{ // byte order from para 7.2.1
                    uuid[0x3], uuid[0x2], uuid[0x1], uuid[0x0], uuid[0x5], uuid[0x4], uuid[0x7], uuid[0x6],
                    uuid[0x8],uuid[0x9], uuid[0xA], uuid[0xB], uuid[0xC], uuid[0xD], uuid[0xE], uuid[0xF]
                }};

                if (auto const begin = std::begin(correctUuid.data), end = std::end(correctUuid.data);
                    !std::all_of(begin, end, std::bind_front(std::equal_to(), 0x00)) && // UUID missing
                    !std::all_of(begin, end, std::bind_front(std::equal_to(), 0xFF))) // UUID missing but can be set
                {
                    return boost::uuids::to_string(correctUuid);
                }
            }
            break;
        }
        }
        break;
    }
    return {};
}

Credits to https://gist.github.com/neacsum/5199627fec4143c1e8d553d38dabed68 - that helped a lot!