openclaw/dist/bounded-utf8-tail-dlh7Ug_1.js

Multi-channel AI gateway with extensible messaging integrations

import { StringDecoder } from "node:string_decoder";
//#region extensions/browser/src/browser/bounded-utf8-tail.ts
/** Byte-bounded UTF-8 tail storage for browser subprocess diagnostics. */
function decodeUtf8Tail(buffer) {
	let start = 0;
	while (start < buffer.length && (buffer[start] & 192) === 128) start += 1;
	return new StringDecoder("utf8").write(buffer.subarray(start));
}
function decodeBoundedUtf8Tail(buffer, maxBytes) {
	if (maxBytes <= 0 || buffer.length === 0) return "";
	return decodeUtf8Tail(buffer.length > maxBytes ? buffer.subarray(buffer.length - maxBytes) : buffer);
}
function createBoundedUtf8Tail(maxBytes) {
	const storage = Buffer.allocUnsafe(Math.max(0, maxBytes));
	let totalBytes = 0;
	return {
		append(chunk) {
			const buffer = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk);
			if (buffer.length === 0 || maxBytes <= 0) return;
			if (buffer.length >= maxBytes) {
				buffer.copy(storage, 0, buffer.length - maxBytes);
				totalBytes = maxBytes;
				return;
			}
			const overflowBytes = Math.max(0, totalBytes + buffer.length - maxBytes);
			if (overflowBytes > 0) {
				storage.copyWithin(0, overflowBytes, totalBytes);
				totalBytes -= overflowBytes;
			}
			buffer.copy(storage, totalBytes);
			totalBytes += buffer.length;
		},
		text() {
			return decodeUtf8Tail(storage.subarray(0, totalBytes));
		},
		clear() {
			totalBytes = 0;
		}
	};
}
//#endregion
export { decodeBoundedUtf8Tail as n, createBoundedUtf8Tail as t };