_maybeGrow()

in src/utils.js [278:291]

• 12 lines of code
• 2 McCabe index (conditional complexity)

  _maybeGrow(n) {
    const curSize = this._buffer.byteLength;
    const newPos = this._pos + n;
    const shortfall = newPos - curSize;
    if (shortfall > 0) {
      // Classic grow-by-doubling, up to 4kB max increment.
      // This formula was not arrived at by any particular science.
      const incr = Math.min(curSize, 4 * 1024);
      const newbuf = new Uint8Array(curSize + Math.ceil(shortfall / incr) * incr);
      newbuf.set(this._buffer, 0);
      this._buffer = newbuf;
      this._dataview = new DataView(newbuf.buffer, newbuf.byteOffset, newbuf.byteLength);
    }
  }