From d678234e90be3d5bc283d0a12a133d240b61facb Mon Sep 17 00:00:00 2001
From: David Baird <dhbaird@gmail.com>
Date: Tue, 12 Nov 2013 19:00:38 -0700
Subject: [PATCH] Fix masking calculation in txbuf.

---
 easywsclient.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/easywsclient.cpp b/easywsclient.cpp
index c95c3c8..c23ea64 100644
--- a/easywsclient.cpp
+++ b/easywsclient.cpp
@@ -342,10 +342,11 @@ class _RealWebSocket : public easywsclient::WebSocket
                 header[13] = masking_key[3];
             }
         }
+        // N.B. - txbuf will keep growing until it can be transmitted over the socket:
         txbuf.insert(txbuf.end(), header.begin(), header.end());
         txbuf.insert(txbuf.end(), message.begin(), message.end());
         if (useMask) {
-            for (size_t i = 0; i != message.size(); ++i) { txbuf[i+header.size()] ^= masking_key[i&0x3]; }
+            for (size_t i = 0; i != message.size(); ++i) { *(txbuf.end() - message.size() + i) ^= masking_key[i&0x3]; }
         }
     }