prepack
Version:
Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.
78 lines (58 loc) • 2.43 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.DataHandler = void 0;
/**
* Copyright (c) 2017-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
/* strict */
//separator for messages according to the protocol
const TWO_CRLF = "\r\n\r\n";
class DataHandler {
constructor() {
this._rawData = new Buffer(0);
this._contentLength = -1;
}
handleData(data, messageProcessor) {
this._rawData = Buffer.concat([this._rawData, data]); // the following code parses a message according to the protocol.
while (this._rawData.length > 0) {
// if we know what length we are expecting
if (this._contentLength >= 0) {
// we have enough data to check for the expected message
if (this._rawData.byteLength >= this._contentLength) {
// first get the expected message
let message = this._rawData.toString("utf8", 0, this._contentLength); // reduce the buffer by the message we got
this._rawData = this._rawData.slice(this._contentLength); // reset the content length to ensure it is extracted for the next message
this._contentLength = -1; // process the message
messageProcessor(message);
continue; // there may be more complete messages to process
}
} else {
// if we don't know the length to expect, we need to extract it first
let idx = this._rawData.indexOf(TWO_CRLF);
if (idx !== -1) {
let header = this._rawData.toString("utf8", 0, idx);
let lines = header.split("\r\n");
for (let i = 0; i < lines.length; i++) {
let pair = lines[i].split(/: +/);
if (pair[0] === "Content-Length") {
this._contentLength = parseInt(pair[1], 10); // reset the contentlength if it is invalid
if (isNaN(this._contentLength)) this._contentLength = -1;
}
}
this._rawData = this._rawData.slice(idx + TWO_CRLF.length);
continue;
} // if we don't find the length we fall through and break
}
break;
}
}
}
exports.DataHandler = DataHandler;
//# sourceMappingURL=DataHandler.js.map