Method _read

lib/internal/vfs/streams.js:123–166

* Implements the readable _read method. * @param {number} size Number of bytes to read

(size)

   * @param {number} size Number of bytes to read
   */
  _read(size) {
    if (this.destroyed || this.#fd === null) {
      this.destroy(createEBADF('read'));
      return;
    }

    // Load content on first read (lazy loading)
    if (this.#content === null) {
      try {
        const vfd = getVirtualFd(this.#fd);
        if (!vfd) {
          this.destroy(createEBADF('read'));
          return;
        }
        // Use the file handle's readFileSync to get content
        this.#content = vfd.entry.readFileSync();
        this.pending = false;
      } catch (err) {
        this.destroy(err);
        return;
      }
    }

    // Calculate how much to read
    // Note: end is inclusive, so we use end + 1 for the upper bound
    const endPos = this.#end === Infinity ? this.#content.length : this.#end + 1;
    const remaining = MathMin(endPos, this.#content.length) - this.#pos;
    if (remaining <= 0) {
      this.push(null);
      return;
    }

    const bytesToRead = MathMin(size, remaining);
    const chunk = this.#content.subarray(this.#pos, this.#pos + bytesToRead);
    this.#pos += bytesToRead;
    this.bytesRead += bytesToRead;

    this.push(chunk);

    // Check if we've reached the end
    if (this.#pos >= endPos || this.#pos >= this.#content.length) {
      this.push(null);
    }
  }

  /**
   * Closes the file descriptor.