base/guid_posix.cc

   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/rand_util.h"
   8 #include "base/stringprintf.h"
   9
  10 namespace base {
  11
  12 std::string GenerateGUID() {
  13   uint64 sixteen_bytes[2] = { base::RandUint64(), base::RandUint64() };
  14   return RandomDataToGUIDString(sixteen_bytes);
  15 }
  16
  17 // TODO(cmasone): Once we're comfortable this works, migrate Windows code to
  18 // use this as well.
  19 std::string RandomDataToGUIDString(const uint64 bytes[2]) {
  20   return StringPrintf("%08X-%04X-%04X-%04X-%012llX",
  21                       static_cast<unsigned int>(bytes[0] >> 32),
  22                       static_cast<unsigned int>((bytes[0] >> 16) & 0x0000ffff),
  23                       static_cast<unsigned int>(bytes[0] & 0x0000ffff),
  24                       static_cast<unsigned int>(bytes[1] >> 48),
  25                       bytes[1] & 0x0000ffffffffffffULL);
  26 }
  27
  28 }  // namespace guid