Adding a HexEncode function to string_utils....

base/string_util_unittest.cc

 // Copyright (c) 2006-2008 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 <stdarg.h>
 
 #include <limits>
 #include <sstream>
 
@@ skipping 1404 matching lines @@
     { L"Hello, my name is Tom", 10, true, L"Hell...Tom" },
     { L"Hello, my name is Tom", 100, false, L"Hello, my name is Tom" }
   };
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(cases); ++i) {
     std::wstring output;
     EXPECT_EQ(cases[i].result,
               ElideString(cases[i].input, cases[i].max_len, &output));
     EXPECT_TRUE(output == cases[i].output);
   }
 }
+
+TEST(StringUtilTest, HexEncode) {
+  std::string hex(HexEncode(NULL, 0));
+  EXPECT_EQ(hex.length(), 0U);
+  unsigned char bytes[] = {0x01, 0xff, 0x02, 0xfe, 0x03};
+  hex = HexEncode(bytes, sizeof(bytes));
+  EXPECT_EQ(hex.compare("01FF02FE03"), 0);
+}