Method unshift

lib/readers.js:91–96

* Modifies the underlying buffer, it concatenates the given buffer with the original (internalBuffer = concat(bytes, internalBuffer)

(bytes)

   * Modifies the underlying buffer, it concatenates the given buffer with the original (internalBuffer = concat(bytes, internalBuffer)
   */
  unshift(bytes) {
    if (this.offset > 0) {
      throw new Error('Can not modify the underlying buffer if already read');
    }
    this.buf = Buffer.concat([bytes, this.buf], bytes.length + this.buf.length);
  }

  /**
   * Reads any number of bytes and moves the offset.