Method deliver

examples/pdf-server/server.ts:930–943

* pdf.js coalesces adjacent missing chunks into one unbounded request, but * readPdfRange clamps each call to MAX_CHUNK_BYTES. Its reader is keyed by * the original `begin` and removed after one delivery, so we must accumulate * slices and call onDataRange exactly once with the full buffer.

(begin: number, end: number)

   * slices and call onDataRange exactly once with the full buffer.
   */
  private async deliver(begin: number, end: number): Promise<void> {
    const buf = new Uint8Array(end - begin);
    let off = 0;
    while (off < buf.length) {
      const want = Math.min(buf.length - off, MAX_CHUNK_BYTES);
      const { data } = await this.readPdfRange(this.url, begin + off, want);
      if (data.length === 0) {
        throw new Error(`empty range at ${begin + off} for ${this.url}`);
      }
      buf.set(data.subarray(0, Math.min(data.length, buf.length - off)), off);
      off += data.length;
    }
    this.onDataRange(begin, buf);
  }
}

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