low risk, potentially varint overflow bug patched thanks to BBR

src/common/varint.h

@@ -36,7 +36,7 @@
 #include <sstream>
 #include <string>
 /*! \file varint.h
- * \breif provides the implementation of varint's
+ * \brief provides the implementation of varint's
  * 
  * The representation of varints is rather odd. The first bit of each
  * octet is significant, it represents wheter there is another part
@@ -52,6 +52,29 @@
 
 namespace tools {
 
+  template<typename T>
+  size_t get_varint_packed_size(T v)
+  {
+    if(v <= 127)
+      return 1;
+    else if(v <= 16383)
+      return 2;
+    else if(v <= 2097151)
+      return 3;
+    else if(v <= 268435455)
+      return 4;
+    else if(v <= 34359738367)
+      return 5;
+    else if(v <= 4398046511103)
+      return 6;
+    else if(v <= 4398046511103)
+      return 6;
+    else if(v <= 562949953421311)
+      return 7;
+    else 
+      return 8;
+  }
+
   /*! \brief Error codes for varint
    */
   enum {