From 261c9067380c5311c98e3576540eee6015be3297 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@anytun.org>
Date: Sun, 17 Jun 2007 22:25:20 +0000
Subject: added [] - operator to Buffer const Buffers are now possible

---
 cypher.cpp | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

(limited to 'cypher.cpp')

diff --git a/cypher.cpp b/cypher.cpp
index 8711862..58b433f 100644
--- a/cypher.cpp
+++ b/cypher.cpp
@@ -28,6 +28,8 @@
  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include <stdexcept>
+
 #include "datatypes.h"
 
 #include "cypher.h"
@@ -35,16 +37,19 @@
 void Cypher::cypher(Buffer& buf)
 {
   Buffer stream = getBitStream(buf.getLength());
-  calc(buf, stream, buf.getLength());
+  exor(buf, stream);
 }
 
-void Cypher::calc(u_int8_t* buf, u_int8_t* bit_stream, u_int32_t length)
+void Cypher::exor(Buffer& buf, const Buffer& bit_stream)
 {
-  for(u_int32_t i; i<length; ++i)
-    buf[i] ^= bit_stream[i];
+  try
+  {
+    for(u_int32_t i; i<buf.getLength(); ++i)
+      buf[i] ^= bit_stream[i];
+  }
+  catch(std::out_of_range& o) {}
 }
 
-
 Buffer NullCypher::getBitStream(u_int32_t length)
 {
   Buffer buf(length);
-- 
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