prep for addon - find loop

src/addons/zmodem/zmodem.js

@@ -0,0 +1,76 @@
+//Eventually?
+//import { Zmodem } from './zmodemjs/dist/zmodem';
+
+(function (addon) {
+  if (typeof exports === 'object' && typeof module === 'object') {
+    /*
+     * CommonJS environment
+     */
+    module.exports = addon(require('../../Terminal').Terminal);
+  } else if (typeof define == 'function') {
+    /*
+     * Require.js is available
+     */
+    define(['../../xterm'], addon);
+  } else {
+    /*
+     * Plain browser environment
+     */
+    addon(window.Terminal);
+  }
+})(function _zmodemAddon(Terminal) {
+    if (Terminal.prototype.attach) {
+        throw "The “zmodem” and “attach” addons are mutually incompatible.";
+    }
+
+    function _makeSendWsWrapper(socket) {
+        return 
+    }
+
+    Object.assign(
+        Terminal.prototype,
+        {
+            zmodemAttach: function zmodemAttach(ws) {
+                var term = this;
+
+                var senderFunc = function _ws_sender_func(octets) {
+                    ws.send( new Uint8Array(octets) );
+                };
+
+                var zsentry = new Zmodem.Sentry( {
+                    to_terminal: function _to_terminal(octets) {
+                        term.write(
+                            String.fromCharCode.apply(String, octets)
+                        );
+                    },
+
+                    sender: senderFunc,
+
+                    on_retract: function _on_retract() {
+                        term.emit("zmodemRetract");
+                    },
+
+                    on_detect: function _on_detect(detection) {
+                        term.emit("zmodemDetect", detection);
+                    },
+                } );
+
+                function handleWSMessage(evt) {
+
+                    //For some reason the first message from the server is text.
+                    if (typeof evt.data === "string") {
+                        term.write(evt.data);
+                    }
+                    else {
+                        zsentry.consume(evt.data);
+                    }
+                }
+
+                ws.binaryType = "arraybuffer";
+                ws.addEventListener("message", handleWSMessage);
+            },
+
+            zmodemBrowser: Zmodem.Browser,
+        }
+    );
+});