base::HexStringToInt conversion function treats the string "0x" as a valid hex number

base/string_number_conversions_unittest.cc

 // Copyright (c) 2010 The Chromium 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 <math.h>
 
 #include <limits>
 
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
@@ skipping 288 matching lines @@
     {"\t\n\v\f\r 0x45", 0x45, false},
     {" 45", 0x45, false},
     {"45 ", 0x45, false},
     {"45:", 0x45, false},
     {"efgh", 0xef, false},
     {"0xefgh", 0xef, false},
     {"hgfe", 0, false},
     {"100000000", -1, false},  // don't care about |output|, just |success|
     {"-", 0, false},
     {"", 0, false},
+    {"0x", 0, false},
   };
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(cases); ++i) {
     const char* ascii_chars = cases[i].input.c_str();
     int output = 0;
     EXPECT_EQ(cases[i].success, HexStringToInt(cases[i].input, &output));
     EXPECT_EQ(cases[i].output, output);
     output = 0;
     EXPECT_EQ(cases[i].success, HexStringToInt(cases[i].input.begin(),
                                                cases[i].input.end(),
@@ skipping 116 matching lines @@
 
 TEST(StringNumberConversionsTest, HexEncode) {
   std::string hex(HexEncode(NULL, 0));
   EXPECT_EQ(hex.length(), 0U);
   unsigned char bytes[] = {0x01, 0xff, 0x02, 0xfe, 0x03, 0x80, 0x81};
   hex = HexEncode(bytes, sizeof(bytes));
   EXPECT_EQ(hex.compare("01FF02FE038081"), 0);
 }
 
 }  // namespace base