From 7a2937931231268e3d736ca0209911f2e16388f5 Mon Sep 17 00:00:00 2001
From: Alan Boudreault <alan@alanb.ca>
Date: Tue, 9 May 2017 17:12:52 -0400
Subject: [PATCH] raise an exception if a number cannot be encoded as vint

---
 cassandra/marshal.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/cassandra/marshal.py b/cassandra/marshal.py
index 712fa6e7..f8f51230 100644
--- a/cassandra/marshal.py
+++ b/cassandra/marshal.py
@@ -127,8 +127,8 @@ def vints_unpack(term):  # noqa
 def vints_pack(values):
     revbytes = bytearray()
     values = [int(v) for v in values[::-1]]
-    for v in values:
-        v = encode_zig_zag(v)
+    for value in values:
+        v = encode_zig_zag(value)
         if v < 128:
             revbytes.append(v)
         else:
@@ -145,6 +145,9 @@ def vints_pack(values):
                 revbytes.append(v & 0xff)
                 v >>= 8
 
+            if num_extra_bytes > 8:
+                raise ValueError('Value %d is too big and cannot be encoded as vint' % value)
+
             # We can now store the last bits in the first byte
             n = 8 - num_extra_bytes
             v |= (0xff >> n << n)