From 32a44a3b5dcc2d0484fd7359c27db95f3a2d053a Mon Sep 17 00:00:00 2001
From: Justin Matthews <jmatthewsr@yahoo.com>
Date: Sat, 8 Sep 2012 20:08:37 -0700
Subject: [PATCH] Websocket: accept a pong (IE10 sends them)

---
 lib/transports/websocket/hybi-16.js | 108 ++++++++++++++++------------
 1 file changed, 62 insertions(+), 46 deletions(-)

diff --git a/lib/transports/websocket/hybi-16.js b/lib/transports/websocket/hybi-16.js
index 69967dad28..12d4c3c56f 100644
--- a/lib/transports/websocket/hybi-16.js
+++ b/lib/transports/websocket/hybi-16.js
@@ -279,6 +279,62 @@ function Parser () {
   this.currentMessage = '';
 
   var self = this;  
+
+  function onPingOrPong (data, pingpong) {
+     if (self.state.lastFragment == false) {
+        self.error('fragmented ping is not supported');
+        return;
+      }
+      
+      var finish = function(mask, finaldata) {
+        self.emit(pingpong, self.unmask(mask, finaldata));
+        self.endPacket();
+      };
+
+      var expectData = function(length, mask) {
+        if (length == 0) {
+          finish(null,null);
+        } 
+        else {
+          self.expect('Data', length, function(finaldata) { 
+              finish(mask, finaldata);
+          });       
+        }
+      };
+
+      var checkMask = function (length) {
+        if (self.state.masked) {
+          self.expect('Mask', 4, function(mask) {            
+            expectData(length, mask);           
+          });
+        }
+        else {
+          expectData(length, null);
+        } 
+      };
+
+      var getLength = function () {
+        // decode length
+        var firstLength = data[1] & 0x7f;
+
+        if (firstLength < 126) {
+          checkMask(firstLength);
+        }
+        else if (firstLength == 126) {
+          self.expect('Length', 2, function(data) {
+            checkMask(util.unpack(data));
+          });
+        }
+        else if (firstLength == 127) {
+          self.expect('Length', 8, function(data) {
+            checkMask(util.unpack(data));
+          });
+        }   
+      };
+
+      getLength(); //step1 
+  }
+
   this.opcodeHandlers = {
     // text
     '1': function(data) {
@@ -384,55 +440,15 @@ function Parser () {
     },
     // ping
     '9': function(data) {
-      if (self.state.lastFragment == false) {
-        self.error('fragmented ping is not supported');
-        return;
-      }
-      
-      var finish = function(mask, data) {
-        self.emit('ping', self.unmask(mask, data));
-        self.endPacket();
-      }
-
-      var expectData = function(length) {
-        if (self.state.masked) {
-          self.expect('Mask', 4, function(data) {
-            var mask = data;
-            self.expect('Data', length, function(data) {
-              finish(mask, data);
-            });
-          });
-        }
-        else {
-          self.expect('Data', length, function(data) { 
-            finish(null, data);
-          });
-        } 
-      }
-
-      // decode length
-      var firstLength = data[1] & 0x7f;
-      if (firstLength == 0) {
-        finish(null, null);        
-      }
-      else if (firstLength < 126) {
-        expectData(firstLength);
-      }
-      else if (firstLength == 126) {
-        self.expect('Length', 2, function(data) {
-          expectData(util.unpack(data));
-        });
-      }
-      else if (firstLength == 127) {
-        self.expect('Length', 8, function(data) {
-          expectData(util.unpack(data));
-        });
-      }      
+      onPingOrPong(data,'ping');
+    },
+    '10': function(data) {
+      onPingOrPong(data,'pong');
     }
-  }
+  };
 
   this.expect('Opcode', 2, this.processPacket);  
-};
+}
 
 /**
  * Inherits from EventEmitter.