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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/guid.h"
      6 
      7 #include "base/strings/string_util.h"
      8 
      9 namespace base {
     10 
     11 bool IsValidGUID(const std::string& guid) {
     12   const size_t kGUIDLength = 36U;
     13   if (guid.length() != kGUIDLength)
     14     return false;
     15 
     16   for (size_t i = 0; i < guid.length(); ++i) {
     17     char current = guid[i];
     18     if (i == 8 || i == 13 || i == 18 || i == 23) {
     19       if (current != '-')
     20         return false;
     21     } else {
     22       if (!IsHexDigit(current))
     23         return false;
     24     }
     25   }
     26 
     27   return true;
     28 }
     29 
     30 }  // namespace base
     31