From 6a5f27bed218eae35412b2dd1773f02e57f84043 Mon Sep 17 00:00:00 2001
From: Victor Zverovich <victor.zverovich@gmail.com>
Date: Tue, 6 May 2014 09:17:53 -0700
Subject: [PATCH] Add test.

---
 test/gtest-extra-test.cc | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/test/gtest-extra-test.cc b/test/gtest-extra-test.cc
index 9215fa7c..077bd476 100644
--- a/test/gtest-extra-test.cc
+++ b/test/gtest-extra-test.cc
@@ -504,6 +504,28 @@ TEST(FileTest, Read) {
   EXPECT_READ(f, "language: cpp");
 }
 
+#ifdef _WIN32
+// The count argument to the read function is unsigned on Windows, so check
+// if integer overflow is handled properly.
+TEST(FileTest, ReadCountOverflow) {
+  if (sizeof(std::size_t) == sizeof(unsigned))
+    return;
+  File read_end, write_end;
+  File::pipe(read_end, write_end);
+  Write(write_end, "test");
+  write_end.close();
+  char buffer[4];
+  std::size_t offset = 0;
+  std::size_t count = std::numeric_limits<unsigned>::max() + std::size_t(1);
+  std::streamsize n = 0;
+  do {
+    n = read_end.read(buffer + offset, count);
+    offset += n;
+  } while (n != 0);
+  EXPECT_EQ("test", std::string(buffer, offset));
+}
+#endif
+
 TEST(FileTest, ReadError) {
   File read_end, write_end;
   File::pipe(read_end, write_end);