docs: function readToTTF(path) {
      let otf2ttfObj = TTF.otf2ttfobject
      let ttfReader  = TTF.TTFReader
      let woff2ttf   = TTF.woff2ttf
      let ext = extname(path).toLowerCase()
      let content = grunt.file.read(path, {encoding: null})
      let ab = toArrayBuffer(content)
      switch(ext){
          case '.otf':
              return otf2ttfObj(ab)
          break
          case '.ttf':
          case '.ttc':
              return new ttfReader().read(ab)
          break
          case '.woff':
          case '.woff2':
              return ttfReader(woff2ttf(ab))
          break
          default:
              throw new Error('Unsupported extension: '+ext)
          break
      }
  }