| 644 | } |
| 645 | } |
| 646 | async writeSLIP(payload, purge = true) { |
| 647 | let escapes = 0; |
| 648 | payload = new Uint8Array(payload); |
| 649 | for (let i = 0; i < payload.length; i++) { |
| 650 | if (0xdb === payload[i]) |
| 651 | escapes += 1; |
| 652 | if (0xc0 === payload[i]) |
| 653 | escapes += 1; |
| 654 | } |
| 655 | let data = new Uint8Array(2 + payload.length + escapes); |
| 656 | data[0] = 0xc0; |
| 657 | for (let i = 0, o = 1; i < payload.length; i++) { |
| 658 | if (0xdb === payload[i]) { |
| 659 | data[o++] = 0xdb; |
| 660 | data[o++] = 0xdd; |
| 661 | } |
| 662 | else |
| 663 | if (0xc0 === payload[i]) { |
| 664 | data[o++] = 0xdb; |
| 665 | data[o++] = 0xdc; |
| 666 | } |
| 667 | else |
| 668 | data[o++] = payload[i]; |
| 669 | } |
| 670 | data[data.length - 1] = 0xc0; |
| 671 | |
| 672 | tracePacket("<<", data); |
| 673 | if (purge) |
| 674 | this.#serial.purge(); |
| 675 | |
| 676 | const buffer = data.buffer; |
| 677 | if (!this.#writeSpaceAvailable) |
| 678 | throw new Error("unexpected: not ready to write"); |
| 679 | |
| 680 | if (buffer.byteLength <= this.#writeSpaceAvailable) { |
| 681 | this.#serial.write(buffer); |
| 682 | this.#writeSpaceAvailable -= buffer.byteLength; |
| 683 | } |
| 684 | else { |
| 685 | let byteOffset = 0, byteLength = buffer.byteLength; |
| 686 | |
| 687 | while (byteOffset < byteLength) { |
| 688 | const writePromise = new Promise(resolve => { |
| 689 | this.#writable = resolve; |
| 690 | }); |
| 691 | |
| 692 | let count = this.#writeSpaceAvailable; |
| 693 | if (count > (byteLength - byteOffset)) |
| 694 | count = (byteLength - byteOffset) |
| 695 | |
| 696 | this.#writeSpaceAvailable -= count; |
| 697 | this.#serial.write(buffer.slice(byteOffset, byteOffset + count)); |
| 698 | byteOffset += count; |
| 699 | |
| 700 | await writePromise; |
| 701 | } |
| 702 | } |
| 703 | } |