Function truncate

extension/background.js:170–179

(req)

    async release({fh}) { Cache.removeObjectForHandle(fh); return {}; },

    async truncate(req) {
      let arr = toUtf8Array(await getData(req));
      if (req.size !== arr.length) {
        const newArr = new Uint8Array(req.size);
        newArr.set(arr.slice(0, Math.min(req.size, arr.length)));
        arr = newArr;
      }
      Cache.setObjectForPath(req.path, arr);
      await setData(req, utf8ArrayToString(arr)); return {};
    }
  });
  makeRouteWithContents.Cache = Cache;
  return makeRouteWithContents;