Method read

src/server/web/scrollback-buffer.ts:51–65

* Returns all buffered bytes in chronological order (oldest first). * The returned Buffer is a copy and safe to send over a WebSocket.

()

   * The returned Buffer is a copy and safe to send over a WebSocket.
   */
  read(): Buffer {
    if (this.stored === 0) return Buffer.alloc(0);

    if (this.stored < this.capacity) {
      // Buffer hasn't wrapped yet — contiguous region starting at index 0
      return Buffer.from(this.buf.subarray(0, this.stored));
    }

    // Buffer is full and has wrapped — oldest data starts at writePos
    const out = Buffer.allocUnsafe(this.capacity);
    const tailLen = this.capacity - this.writePos;
    this.buf.copy(out, 0, this.writePos); // tail (oldest)
    this.buf.copy(out, tailLen, 0, this.writePos); // head (newest)
    return out;
  }
}