docs: private boolean processBlockSignature(ReadBuffer readBuffer) {
          if (this.mapFileHeader.getMapFileInfo().debugFile) {
              // get and check the block signature
              String signatureBlock = readBuffer.readUTF8EncodedString(SIGNATURE_LENGTH_BLOCK);
              if (!signatureBlock.startsWith("###TileStart")) {
                  LOGGER.warning("invalid block signature: " + signatureBlock);
                  return false;
              }
          }
          return true;
      }