packet fragmentation that doesnt work

example/example.html

@@ -6,12 +6,17 @@
     <title>Wormhole test</title>
 
     <script>
+        let theFunniestStringEver = '';
+        for (let i = 0; i < 1000000; i++) {
+            theFunniestStringEver += 'h';
+        }
+
         // Create WebSocket connection.
         const socket = new WebSocket('ws://localhost:8080/hello');
 
         // Connection opened
         socket.addEventListener('open', function (event) {
-            socket.send('Hello Server!');
+            socket.send(theFunniestStringEver);
         });
 
         socket.addEventListener('error', console.error)

example/example.js

@@ -8,7 +8,14 @@ const wormhole = new Wormhole({ urls: [ '/hello' ], httpServer });
 
 wormhole.on('connect', ({ socket, accept, reject }) => {
     accept();
-    socket.sendText('hello');
+    const buf = Buffer.from([0x41, 0x41, 0x41, 0x41]);
+    socket.send(buf);
+    socket.on('text', (e) => {
+        //console.log('Got text frame', e);
+    });
+    socket.on('binary', () => {
+        //console.log('Got binary frame', e);
+    });
 });
 
 httpServer.listen(8080);

lib/Parser.js

@@ -56,13 +56,13 @@ const parseWebsocketFrame = (data) => {
     const frame = new WebsocketFrame();
 
     // 1 byte - first byte
-    frame.FIN = (firstByte & 0x01); // 0x01[0b10000000] - Get most significant bit (FIN)
-    frame.RSVx = (firstByte & 0x70) // 0x70[0b01110000] - Get the 3 bits after the most significant bit (RSVx)
-    frame.Opcode = (firstByte & 0x0F) // 0xF[0b00001111] - Get the last 4 bits (Opcode)
+    frame.FIN = (firstByte >> 7); // >> 7 - Get most significant bit (FIN)
+    frame.RSVx = (firstByte & 0x70) >> 4; // 0x70[0b01110000] - Get the 3 bits after the most significant bit (RSVx)
+    frame.Opcode = (firstByte & 0x0F); // 0xF[0b00001111] - Get the last 4 bits (Opcode)
 
     // 1 byte - second byte
-    frame.MASK = (secondByte & 0x01) // 0x01[0b10000000] - Get most significant bit (MASK)
-    frame.PayloadLen = (secondByte & 0x7F) // 0x7F[0b01111111] - Get last 7 bits (Payload len)
+    frame.MASK = (secondByte >> 7); // >> 7 - Get most significant bit (MASK)
+    frame.PayloadLen = (secondByte & 0x7F); // 0x7F[0b01111111] - Get last 7 bits (Payload len)
 
     let maskingKeyOffset = 2; // By default, theres a 2 byte offset. We will modify this in the cases below.
 
@@ -77,11 +77,11 @@ const parseWebsocketFrame = (data) => {
         frame.PayloadLenEx = frame.PayloadLen;
     }
     
-    const maskingKeyEnd = maskingKeyOffset + 4; // (4 bytes because it is a 32 bit value)
+    let maskingKeyEnd = frame.MASK ? maskingKeyOffset + 4 : maskingKeyOffset; // (4 bytes because it is a 32 bit value)    
     if (frame.MASK) frame.MaskingKey = data.buffer.slice(maskingKeyOffset, maskingKeyEnd); // Create a new buffer starting at the masking key offset and ending at the masking key end (duh).
 
     // TODO: Separate extension data from application data
-    frame.PayloadData = data.buffer.slice(maskingKeyEnd, maskingKeyEnd + frame.PayloadLenEx); // Create a new buffer that starts at the end of the masking key and ends at (the end of the masking key + payload length)
+    frame.PayloadData = data.buffer.slice(maskingKeyEnd, Number(BigInt(maskingKeyEnd) + BigInt(frame.PayloadLenEx))); // Create a new buffer that starts at the end of the masking key and ends at (the end of the masking key + payload length)
 
     // TODO: implement unmasked string decoding
     if (frame.MASK) {

lib/Socket.js

@@ -1,29 +1,69 @@
+const EventEmitter = require('events');
+
 const constants = require("./constants");
 const parser = require('./Parser');
 
-class Socket {
+class Socket extends EventEmitter {
     constructor({ initialState='CONNECTING', socket }) {
+        super();
+
         this._state = initialState;
         this._socket = socket;
         this._accepted = false;
         this._fateDecided = false; // Wether the decision to accept or reject the socket was made
 
-        this._socket.on('data', (e) => {
-            if (this._state !== constants.states.OPEN) return;
+        this._buffering = undefined;
 
-            this._decodePayload(e.buffer);
+        this._socket.on('data', (e) => {
+            if (!this._isConnected()) return;
+
+            const packet = this._decodePayload(e.buffer);
+
+            console.log(packet);
+
+            if (this._buffering && packet.FIN === 1) {
+                this.emit('binary', Buffer.concat([this._buffering, packet.PayloadData]));
+                this._buffering = undefined;
+            }
+
+            if (packet.FIN === 0) {
+                if (!this._buffering) {
+                    this._buffering = Buffer.from(packet.PayloadData);
+                } else {
+                    Buffer.concat([this._buffering, Buffer.from(packet.PayloadData)]);
+                }
+                
+                console.log('Buffering', packet);
+                return;
+            }
+
+            if (packet.Opcode === constants.opcodes.TEXT_FRAME) {
+                this.emit('text', packet);
+            } else if (packet.Opcode === constants.opcodes.BINARY_FRAME) {
+                this.emit('binary', packet);
+            }
         });
     }
 }
 
-Socket.prototype.sendText = function(text) {
+Socket.prototype.send = function(payload) {
+    if (typeof payload === 'string') {
+        this._sendBuffer(Buffer.from(payload));
+    } else if (payload instanceof Buffer) {
+        this._sendBuffer(payload);
+    } else {
+        throw new Error(`Unsupported type ${typeof payload}, supported types are: string, Buffer`);
+    }
+};
+
+Socket.prototype._sendBuffer = function(buffer) {
     const frame = new parser.WebsocketFrame();
     frame.FIN = 1;
     frame.RSVx = 0;
     frame.Opcode = 0x01;
 
     frame.MASK = 0;
-    const length = text.length;
+    const length = buffer.byteLength;
     if (length > 125) {
         frame.PayloadLen = 126;
     } else if (length >= 65536) {
@@ -32,13 +72,13 @@ Socket.prototype.sendText = function(text) {
         frame.PayloadLen = length;
     }
     frame.PayloadLenEx = length;
-    frame.PayloadData = Buffer.from(text);
+    frame.PayloadData = buffer;
 
     this._socket.write(frame.toBuffer());
 };
 
 Socket.prototype._decodePayload = function(payload) {
-    console.log(parser.parseWebsocketFrame(new DataView(payload)));
+    return parser.parseWebsocketFrame(new DataView(payload));
 };
 
 Socket.prototype._setConnectionState = function(state) {
@@ -52,4 +92,8 @@ Socket.prototype._setAccepted = function(state) {
     this._accepted = state;
 };
 
+Socket.prototype._isConnected = function() {
+    return (this._fateDecided && this._isConnected && this._accepted === true);
+}
+
 module.exports = Socket;

lib/constants.js

@@ -7,5 +7,10 @@ module.exports = {
         OPEN: 'OPEN',
         CLOSING: 'CLOSING',
         CLOSED: 'CLOSED'
+    },
+    opcodes: {
+        'CONTINUATION': 0x00,
+        'TEXT_FRAME': 0x01,
+        'BINARY_FRAME': 0x02
     }
-}
+};