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      1 // Copyright (c) 2010 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 "chrome/common/guid.h"
      6 
      7 #include "base/rand_util.h"
      8 #include "base/stringprintf.h"
      9 
     10 namespace guid {
     11 
     12 bool IsValidGUID(const std::string& guid) {
     13   const size_t kGUIDLength = 36U;
     14   if (guid.length() != kGUIDLength)
     15     return false;
     16 
     17   std::string hexchars = "0123456789ABCDEF";
     18   for (uint32 i = 0; i < guid.length(); ++i) {
     19     char current = guid[i];
     20     if (i == 8 || i == 13 || i == 18 || i == 23) {
     21       if (current != '-')
     22         return false;
     23     } else {
     24       if (hexchars.find(current) == std::string::npos)
     25         return false;
     26     }
     27   }
     28 
     29   return true;
     30 }
     31 
     32 }  // namespace guid
     33