chore(vendor): import pi 0.85.1

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/protocol/src/cbor/options.ts

@@ -0,0 +1,52 @@
+export const UINT32_BASE = 0x1_0000_0000;
+export const MAX_UINT32 = 0xffff_ffff;
+const MAX_CONFIGURED_DEPTH = 512;
+
+/** Safe defaults for untrusted protocol payloads. */
+export const DEFAULT_MAX_CBOR_BYTE_LENGTH = 16 * 1024 * 1024;
+export const DEFAULT_MAX_CBOR_CONTAINER_LENGTH = 1_000_000;
+export const DEFAULT_MAX_CBOR_DEPTH = 64;
+
+export interface CborOptions {
+	/** Maximum encoded input/output bytes and maximum byte/text string length. */
+	maxByteLength?: number;
+	/** Maximum number of elements in an array or entries in a map. */
+	maxContainerLength?: number;
+	/** Maximum recursive item depth. */
+	maxDepth?: number;
+}
+
+export interface ResolvedCborOptions {
+	maxByteLength: number;
+	maxContainerLength: number;
+	maxDepth: number;
+}
+
+export class CborError extends Error {
+	constructor(message: string) {
+		super(message);
+		this.name = "CborError";
+	}
+}
+
+export const textEncoder = new TextEncoder();
+export const textDecoder = new TextDecoder("utf-8", { fatal: true, ignoreBOM: true });
+
+function resolveLimit(name: string, value: number, maximum: number): number {
+	if (!Number.isSafeInteger(value) || value < 0 || value > maximum) {
+		throw new RangeError(`${name} must be an integer between 0 and ${maximum}`);
+	}
+	return value;
+}
+
+export function resolveOptions(options: CborOptions | undefined): ResolvedCborOptions {
+	return {
+		maxByteLength: resolveLimit("maxByteLength", options?.maxByteLength ?? DEFAULT_MAX_CBOR_BYTE_LENGTH, MAX_UINT32),
+		maxContainerLength: resolveLimit(
+			"maxContainerLength",
+			options?.maxContainerLength ?? DEFAULT_MAX_CBOR_CONTAINER_LENGTH,
+			MAX_UINT32,
+		),
+		maxDepth: resolveLimit("maxDepth", options?.maxDepth ?? DEFAULT_MAX_CBOR_DEPTH, MAX_CONFIGURED_DEPTH),
+	};
+}