From 3da7c7b7dcf10687e75639bf435cb61ffcf173f2 Mon Sep 17 00:00:00 2001
From: Project Nayuki <me@nayuki.io>
Date: Mon, 24 Apr 2017 20:47:32 +0000
Subject: [PATCH] Fixed potential overflow in C++ code, in worst case when int
 type is int16.

---
 cpp/QrSegment.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpp/QrSegment.cpp b/cpp/QrSegment.cpp
index f96ec1a..cd514d5 100644
--- a/cpp/QrSegment.cpp
+++ b/cpp/QrSegment.cpp
@@ -141,7 +141,7 @@ int QrSegment::getTotalBits(const std::vector<QrSegment> &segs, int version) {
 		const QrSegment &seg(segs.at(i));
 		int ccbits = seg.mode.numCharCountBits(version);
 		// Fail if segment length value doesn't fit in the length field's bit-width
-		if ((unsigned int)seg.numChars >= (1U << ccbits) || seg.bitLength > INT16_MAX)
+		if (seg.numChars >= (1L << ccbits) || seg.bitLength > INT16_MAX)
 			return -1;
 		long temp = (long)result + 4 + ccbits + seg.bitLength;
 		if (temp > INT_MAX)