unzipper-esm
Version:
Unzip cross-platform streaming API
157 lines (153 loc) • 7.46 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = void 0;
var _stream = require("stream");
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); }
function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } }
function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
function _callSuper(t, o, e) { return o = _getPrototypeOf(o), _possibleConstructorReturn(t, _isNativeReflectConstruct() ? Reflect.construct(o, e || [], _getPrototypeOf(t).constructor) : o.apply(t, e)); }
function _possibleConstructorReturn(t, e) { if (e && ("object" == _typeof(e) || "function" == typeof e)) return e; if (void 0 !== e) throw new TypeError("Derived constructors may only return object or undefined"); return _assertThisInitialized(t); }
function _assertThisInitialized(e) { if (void 0 === e) throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); return e; }
function _isNativeReflectConstruct() { try { var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); } catch (t) {} return (_isNativeReflectConstruct = function _isNativeReflectConstruct() { return !!t; })(); }
function _getPrototypeOf(t) { return _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function (t) { return t.__proto__ || Object.getPrototypeOf(t); }, _getPrototypeOf(t); }
function _inherits(t, e) { if ("function" != typeof e && null !== e) throw new TypeError("Super expression must either be null or a function"); t.prototype = Object.create(e && e.prototype, { constructor: { value: t, writable: !0, configurable: !0 } }), Object.defineProperty(t, "prototype", { writable: !1 }), e && _setPrototypeOf(t, e); }
function _setPrototypeOf(t, e) { return _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function (t, e) { return t.__proto__ = e, t; }, _setPrototypeOf(t, e); }
// 'node:stream'
// It's not clear why did they extract a string into a variable.
var FUNCTION_STRING = 'function';
var PullStream = exports["default"] = /*#__PURE__*/function (_Duplex) {
function PullStream() {
var _this;
_classCallCheck(this, PullStream);
_this = _callSuper(this, PullStream, [{
decodeStrings: false,
objectMode: true
}]);
_this.buffer = Buffer.from('');
var self = _this;
self.on('finish', function () {
self.finished = true;
self.emit('chunk', false);
});
return _this;
}
_inherits(PullStream, _Duplex);
return _createClass(PullStream, [{
key: "_write",
value: function _write(chunk, e, cb) {
this.buffer = Buffer.concat([this.buffer, chunk]);
this.cb = cb;
this.emit('chunk');
}
}, {
key: "stream",
value:
// The `eof` parameter is interpreted as `file_length` if the type is number
// otherwise (i.e. buffer) it is interpreted as a pattern signaling end of stream
function stream(eof, includeEof) {
var p = new _stream.PassThrough();
var done;
var self = this;
function cb() {
if (_typeof(self.cb) === FUNCTION_STRING) {
var callback = self.cb;
self.cb = undefined;
return callback();
}
}
function pull() {
var packet;
if (self.buffer && self.buffer.length) {
if (typeof eof === 'number') {
packet = self.buffer.slice(0, eof);
self.buffer = self.buffer.slice(eof);
eof -= packet.length;
done = done || !eof;
} else {
var match = self.buffer.indexOf(eof);
if (match !== -1) {
// store signature match byte offset to allow us to reference
// this for zip64 offset
self.match = match;
if (includeEof) match = match + eof.length;
packet = self.buffer.slice(0, match);
self.buffer = self.buffer.slice(match);
done = true;
} else {
var len = self.buffer.length - eof.length;
if (len <= 0) {
cb();
} else {
packet = self.buffer.slice(0, len);
self.buffer = self.buffer.slice(len);
}
}
}
if (packet) p.write(packet, function () {
if (self.buffer.length === 0 || eof.length && self.buffer.length <= eof.length) cb();
});
}
if (!done) {
if (self.finished) {
self.removeListener('chunk', pull);
self.emit('error', new Error('FILE_ENDED'));
return;
}
} else {
self.removeListener('chunk', pull);
p.end();
}
}
self.on('chunk', pull);
pull();
return p;
}
}, {
key: "pull",
value: function pull(eof, includeEof) {
if (eof === 0) return Promise.resolve('');
// If we already have the required data in buffer
// we can resolve the request immediately
if (!isNaN(eof) && this.buffer.length > eof) {
var data = this.buffer.slice(0, eof);
this.buffer = this.buffer.slice(eof);
return Promise.resolve(data);
}
// Otherwise we stream until we have it
var buffer = Buffer.from('');
var self = this;
var concatStream = new _stream.Transform({
transform: function transform(d, e, cb) {
buffer = Buffer.concat([buffer, d]);
cb();
}
});
var rejectHandler;
var pullStreamRejectHandler;
return new Promise(function (resolve, reject) {
rejectHandler = reject;
pullStreamRejectHandler = function pullStreamRejectHandler(e) {
self.__emittedError = e;
reject(e);
};
if (self.finished) return reject(new Error('FILE_ENDED'));
self.once('error', pullStreamRejectHandler); // reject any errors from pullstream itself
self.stream(eof, includeEof).on('error', reject).pipe(concatStream).on('finish', function () {
resolve(buffer);
}).on('error', reject);
})["finally"](function () {
self.removeListener('error', rejectHandler);
self.removeListener('error', pullStreamRejectHandler);
});
}
}, {
key: "_read",
value: function _read() {}
}]);
}(_stream.Duplex);
//# sourceMappingURL=PullStream.js.map