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1234567891011121314151617181920212223242526272829303132333435363738export * as PtyProtocol from "./protocol.js"
// Wire protocol for PTY websocket transports. The PTY domain service is transport-free; server// routes adapt Pty.attach to websockets with these helpers so every surface speaks one protocol.//// Outbound frames are raw UTF-8 terminal chunks. One control frame — a 0x00 byte followed by// UTF-8 JSON — carries the absolute output cursor after replay so clients can resume later.
const encoder = new TextEncoder()const decoder = new TextDecoder("utf-8", { fatal: true })
// Replay can be megabytes; send it in bounded frames.export const REPLAY_CHUNK = 64 * 1024
export function metaFrame(cursor: number) { const bytes = encoder.encode(JSON.stringify({ cursor })) const out = new Uint8Array(bytes.length + 1) out[0] = 0 out.set(bytes, 1) return out}
export function chunks(data: string) { const out: string[] = [] for (let i = 0; i < data.length; i += REPLAY_CHUNK) out.push(data.slice(i, i + REPLAY_CHUNK)) return out}
// Inbound client frames are UTF-8 text or binary; invalid UTF-8 input is dropped.export function decodeInput(message: string | Uint8Array | ArrayBuffer) { if (typeof message === "string") return message try { return decoder.decode(message instanceof ArrayBuffer ? new Uint8Array(message) : message) } catch { return undefined }}