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/strings/stringprintf.h"
9
10namespace base {
11
12std::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.
19std::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
29