Method loadMetadataFromDisk

outofcore/src/outofcore_base_data.cpp:171–235

    ////////////////////////////////////////////////////////////////////////////////

    int
    OutofcoreOctreeBaseMetadata::loadMetadataFromDisk ()
    {
      // Open JSON
      std::vector<char> idx_input;
      std::uintmax_t len = boost::filesystem::file_size (metadata_filename_);
      idx_input.resize (len + 1);

      std::ifstream f (metadata_filename_.string ().c_str (), std::ios::in);
      f.read (&(idx_input.front ()), len);
      idx_input.back () = '\0';

      // Parse JSON
      std::shared_ptr<cJSON> idx (cJSON_Parse (&(idx_input.front ())), cJSON_Delete);
      cJSON* name = cJSON_GetObjectItem (idx.get (), "name");
      cJSON* version = cJSON_GetObjectItem (idx.get (), "version");
      cJSON* pointtype = cJSON_GetObjectItem (idx.get (), "pointtype");
      cJSON* lod = cJSON_GetObjectItem (idx.get (), "lod");
      cJSON* numpts = cJSON_GetObjectItem (idx.get (), "numpts");
      cJSON* coord = cJSON_GetObjectItem (idx.get (), "coord_system");

      bool parse_failure = false;

      // Validate JSON
      if (!((name) && (version) && (pointtype) && (lod) && (numpts) && (coord)))
      {
        PCL_ERROR ( "[pcl::outofcore::OutofcoreOctreeBaseMetadata::loadMetadataFromDisk] One of expected metadata fields does not exist in %s\n", metadata_filename_.c_str ());
        parse_failure = true;
      }
      if ((name->type != cJSON_String) || (version->type != cJSON_Number) || (pointtype->type != cJSON_String)
          || (lod->type != cJSON_Number) || (numpts->type != cJSON_Array) || (coord->type != cJSON_String))
      {
        PCL_ERROR ( "[pcl::outofcore::OutofcoreOctreeBaseMetadata::loadMetadataFromDisk] One of metadata fields does not contain its expected type in %s\n",metadata_filename_.c_str ());
        parse_failure = true;
      }
      if (version->valuedouble != 2.0 && version->valuedouble != 3.0)//only support version 2.0 and 3.0
      {
        PCL_ERROR ( "[pcl::outofcore::OutofcoreOctreeBaseMetadata::loadMetadataFromDisk] Outofcore version field (just read version:number = %.1lf) in %s does not match the current supported versions\n",metadata_filename_.c_str (), version->valuedouble);
        parse_failure = true;
      }
      if ((lod->valueint + 1) != cJSON_GetArraySize (numpts))
      {
        PCL_ERROR ( "[pcl::outofcore::OutofcoreOctreeBaseMetadata::loadMetadataFromDisk] lod:num+1=%d+1 (i.e. height of tree) does not match size of LOD array (%d) in %s\n", lod->valueint, cJSON_GetArraySize (numpts), metadata_filename_.c_str ());
        parse_failure = true;
      }

      if (parse_failure)
      {
        PCL_THROW_EXCEPTION (PCLException, "[pcl::outofcore::OutofcoreOctreeBaseMetadata::loadMetadataFromDisk] Parse Failure\n");
      }
      

      // Get Data
      LOD_num_points_.resize (lod->valueint + 1);
      for (int i = 0; i < (lod->valueint + 1); i++)
      {
        //cJSON doesn't have explicit 64bit int, have to use double, get up to 2^52
        LOD_num_points_[i] = static_cast<std::uint64_t> (cJSON_GetArrayItem (numpts, i)->valuedouble );