Method readSync

lib/internal/vfs/file_handle.js:464–487

* Reads data from the file synchronously. * @param {Buffer} buffer The buffer to read into * @param {number} offset The offset in the buffer to start writing * @param {number} length The number of bytes to read * @param {number|null} position The position to read from (null uses current

(buffer, offset, length, position)

   * @returns {number} The number of bytes read
   */
  readSync(buffer, offset, length, position) {
    this.#checkClosed('read');
    this.#checkReadable();

    // Get content (resolves dynamic content providers)
    const content = this.content;
    const readPos = position !== null && position !== undefined ?
      Number(position) : this.position;
    const available = content.length - readPos;

    if (available <= 0) {
      return 0;
    }

    const bytesToRead = MathMin(length, available);
    content.copy(buffer, offset, readPos, readPos + bytesToRead);

    // Update position if not using explicit position
    if (position === null || position === undefined) {
      this.position = readPos + bytesToRead;
    }

    return bytesToRead;
  }

  /**
   * Reads data from the file.