1 files changed, 53 insertions, 0 deletions
diff --git a/core/fxcrt/fx_string_unittest.cpp b/core/fxcrt/fx_string_unittest.cpp
new file mode 100644
index 0000000000..b311165638
--- /dev/null
+++ b/core/fxcrt/fx_string_unittest.cpp
@@ -0,0 +1,53 @@
+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <limits>
+
+#include "core/fxcrt/fx_string.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(fxstring, FX_atonum) {
+  int i;
+  EXPECT_TRUE(FX_atonum("10", &i));
+  EXPECT_EQ(10, i);
+
+  EXPECT_TRUE(FX_atonum("-10", &i));
+  EXPECT_EQ(-10, i);
+
+  EXPECT_TRUE(FX_atonum("+10", &i));
+  EXPECT_EQ(10, i);
+
+  EXPECT_TRUE(FX_atonum("-2147483648", &i));
+  EXPECT_EQ(std::numeric_limits<int>::min(), i);
+
+  EXPECT_TRUE(FX_atonum("2147483647", &i));
+  EXPECT_EQ(2147483647, i);
+
+  // Value overflows.
+  EXPECT_TRUE(FX_atonum("-2147483649", &i));
+  EXPECT_EQ(0, i);
+
+  // Value overflows.
+  EXPECT_TRUE(FX_atonum("+2147483648", &i));
+  EXPECT_EQ(0, i);
+
+  // Value overflows.
+  EXPECT_TRUE(FX_atonum("4223423494965252", &i));
+  EXPECT_EQ(0, i);
+
+  // No explicit sign will allow the number to go negative. This is for things
+  // like the encryption Permissions flag (Table 3.20 PDF 1.7 spec)
+  EXPECT_TRUE(FX_atonum("4294965252", &i));
+  EXPECT_EQ(-2044, i);
+
+  EXPECT_TRUE(FX_atonum("-4294965252", &i));
+  EXPECT_EQ(0, i);
+
+  EXPECT_TRUE(FX_atonum("+4294965252", &i));
+  EXPECT_EQ(0, i);
+
+  float f;
+  EXPECT_FALSE(FX_atonum("3.24", &f));
+  EXPECT_FLOAT_EQ(3.24f, f);
+}