CDIXMLGenerator.hxx

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#ifndef _CDIXMLGENERATOR_HXX_
#define _CDIXMLGENERATOR_HXX_
 
#include "openlcb/SimpleStack.hxx"
#include "utils/FileUtils.hxx"
 
class CDIXMLGenerator
{
public:
    template <class ConfigDef>
    static bool create_config_descriptor_xml(
        const ConfigDef &config, const char *filename,
        openlcb::SimpleStackBase *stack = nullptr)
    {
        string cdi_string;
        ConfigDef cfg(config.offset());
        cfg.config_renderer().render_cdi(&cdi_string);
 
        cdi_string += '\0';
 
        bool need_write = false;
        LOG(INFO, "[CDI] Checking %s...", filename);
        FILE *ff = fopen(filename, "rb");
        if (!ff)
        {
            LOG(INFO, "[CDI] File %s does not exist", filename);
            need_write = true;
        }
        else
        {
            fclose(ff);
            string current_str = read_file_to_string(filename);
            if (current_str != cdi_string)
            {
                LOG(INFO, "[CDI] File %s is not up-to-date", filename);
                need_write = true;
            }
            else
            {
                LOG(INFO, "[CDI] File %s appears up-to-date (len %u vs %u)",
                    filename, current_str.size(), cdi_string.size());
            }
        }
        if (need_write)
        {
            LOG(INFO, "[CDI] Updating %s (len %u)", filename,
                cdi_string.size());
            write_string_to_file(filename, cdi_string);
        }
 
        if (stack)
        {
            LOG(INFO, "[CDI] Registering CDI with stack...");
            // Creates list of event IDs for factory reset.
            auto *v = new vector<uint16_t>();
            cfg.handle_events([v](unsigned o) { v->push_back(o); });
            v->push_back(0);
            stack->set_event_offsets(v);
            // We leak v because it has to stay alive for the entire lifetime
            // of the stack.
 
            // Add the file memory space to the stack.
            openlcb::MemorySpace *space =
                new openlcb::ROFileMemorySpace(filename);
            stack->memory_config_handler()->registry()->insert(
                stack->node(), openlcb::MemoryConfigDefs::SPACE_CDI, space);
        }
        return need_write;
    }
};
 
#endif // _CDIXMLGENERATOR_HXX_