Function isBinary

src/webgl/loading.js:703–715

* @private * This function checks if the file is in ASCII format or in Binary format * * It is done by searching keyword `solid` at the start of the file. * * An ASCII STL data must begin with `solid` as the first six bytes. * However, ASCII STLs lacking the SPACE after the `d` are

(data)

   * Search for `solid` to start anywhere after those prefixes.
   */
  function isBinary(data) {
    const reader = new DataView(data);

    // US-ASCII ordinal values for `s`, `o`, `l`, `i`, `d`
    const solid = [115, 111, 108, 105, 100];
    for (let off = 0; off < 5; off++) {
      // If "solid" text is matched to the current offset, declare it to be an ASCII STL.
      if (matchDataViewAt(solid, reader, off)) return false;
    }

    // Couldn't find "solid" text at the beginning; it is binary STL.
    return true;
  }

  /**
   * @private