inline HRESULT GetFileInfo()

in include/wil/filesystem.h [885:924]
38 lines of code
6 McCabe index (conditional complexity)

        inline HRESULT GetFileInfo(HANDLE fileHandle, FILE_INFO_BY_HANDLE_CLASS infoClass, size_t allocationSize,
            _Outptr_result_nullonfailure_ void **result)
        {
            *result = nullptr;

            wistd::unique_ptr<char[]> resultHolder(new(std::nothrow) char[allocationSize]);
            RETURN_IF_NULL_ALLOC(resultHolder);

            for (;;)
            {
                if (GetFileInformationByHandleEx(fileHandle, infoClass, resultHolder.get(), static_cast<DWORD>(allocationSize)))
                {
                    *result = resultHolder.release();
                    break;
                }
                else
                {
                    DWORD const lastError = ::GetLastError();
                    if (lastError == ERROR_MORE_DATA)
                    {
                        allocationSize *= 2;
                        resultHolder.reset(new(std::nothrow) char[allocationSize]);
                        RETURN_IF_NULL_ALLOC(resultHolder);
                    }
                    else if (lastError == ERROR_NO_MORE_FILES) // for folder enumeration cases
                    {
                        break;
                    }
                    else if (lastError == ERROR_INVALID_PARAMETER) // operation not supported by file system
                    {
                        return HRESULT_FROM_WIN32(lastError);
                    }
                    else
                    {
                        RETURN_WIN32(lastError);
                    }
                }
            }
            return S_OK;
        }