refactor curimage into a slice of buffers & pass options via session

handlers.ts

@@ -148,21 +148,21 @@ const deal_with_data = (session: Session, dv: DataView) => {
   } else {
     const data = dv.add(8).readByteArray(pkt_len - 4);
     if (is_new_image) {
-      if (session.curImage != null && !session.frame_is_bad) {
+      if (session.curImage.length > 0 && !session.frame_is_bad) {
         session.eventEmitter.emit("frame");
       }
 
       session.frame_is_bad = false;
-      session.curImage = Buffer.from(data.buffer);
+      session.curImage = [Buffer.from(data.buffer)];
       session.rcvSeqId = pkt_id;
     } else {
       if (pkt_id <= session.rcvSeqId) {
         // retransmit
         return;
       }
-      if (session.frame_is_bad) {
-        return;
-      }
+
+      let b = Buffer.from(data.buffer);
+
       if (pkt_id > session.rcvSeqId + 1) {
         // missed some packets -- filling with zeroes still produces a broken
         // image
@@ -172,7 +172,7 @@ const deal_with_data = (session: Session, dv: DataView) => {
       }
       session.rcvSeqId = pkt_id;
       if (session.curImage != null) {
-        session.curImage = Buffer.concat([session.curImage, Buffer.from(data.buffer)]);
+        session.curImage.push(b);
       }
     }
   }

http_server.ts

@@ -63,9 +63,11 @@ devEv.on("discover", (rinfo: RemoteInfo, dev: DevSerial) => {
   const header = Buffer.from(`--${BOUNDARY}\r\nContent-Type: image/jpeg\r\n\r\n`);
 
   s.eventEmitter.on("frame", () => {
+    const assembled = Buffer.concat(s.curImage);
+
     responses[dev.devId].forEach((res) => {
       res.write(header);
-      res.write(s.curImage);
+      res.write(assembled);
     });
   });
 

session.ts

@@ -17,9 +17,10 @@ export type Session = {
   connected: boolean;
   devName: string;
   timers: ReturnType<typeof setInterval>[];
-  curImage: Buffer | null;
+  curImage: Buffer[];
   rcvSeqId: number;
   frame_is_bad: boolean;
+  options: opt;
 };
 
 export type PacketHandler = (session: Session, dv: DataView, rinfo: RemoteInfo) => void;
@@ -29,16 +30,15 @@ type msgCb = (
   handlers: Record<keyof typeof Commands, PacketHandler>,
   msg: Buffer,
   rinfo: RemoteInfo,
-  options: opt,
 ) => void;
 
-const handleIncoming: msgCb = (session, handlers, msg, rinfo, options) => {
+const handleIncoming: msgCb = (session, handlers, msg, rinfo) => {
   const ab = new Uint8Array(msg).buffer;
   const dv = new DataView(ab);
   const cmd = CommandsByValue[dv.readU16()];
-  if (options.debug) {
+  if (session.options.debug) {
     console.log(`<< ${cmd}`);
-    console.log(hexdump(msg.buffer, { ansi: options.ansi, ansiColor: 1 }));
+    console.log(hexdump(msg.buffer, { ansi: session.options.ansi, ansiColor: 1 }));
   }
   handlers[cmd](session, dv, rinfo);
   session.lastReceivedPacket = Date.now();
@@ -58,7 +58,7 @@ export const makeSession = (
     sock.close();
   });
 
-  sock.on("message", (msg, rinfo) => handleIncoming(session, handlers, msg, rinfo, options));
+  sock.on("message", (msg, rinfo) => handleIncoming(session, handlers, msg, rinfo));
 
   sock.on("listening", () => {
     const buf = makePunchPkt(dev);
@@ -98,9 +98,10 @@ export const makeSession = (
       sock.send(new Uint8Array(msg.buffer), SEND_PORT, session.dst_ip);
     },
     dst_ip: ra.address,
-    curImage: null,
+    curImage: [],
     rcvSeqId: 0,
     frame_is_bad: false,
+    options: options,
   };
 
   session.eventEmitter.on("disconnect", () => {