OLD | NEW |
1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/metrics/metrics_hashes.h" | 5 #include "base/metrics/metrics_hashes.h" |
6 | 6 |
7 #include "base/debug/alias.h" | |
8 #include "base/logging.h" | 7 #include "base/logging.h" |
9 #include "base/md5.h" | 8 #include "base/md5.h" |
10 #include "base/sys_byteorder.h" | 9 #include "base/sys_byteorder.h" |
11 | 10 |
12 namespace base { | 11 namespace base { |
13 | 12 |
14 namespace { | 13 namespace { |
15 | 14 |
16 // Converts the 8-byte prefix of an MD5 hash into a uint64_t value. | 15 // Converts the 8-byte prefix of an MD5 hash into a uint64_t value. |
17 inline uint64_t DigestToUInt64(const base::MD5Digest& digest) { | 16 inline uint64_t DigestToUInt64(const base::MD5Digest& digest) { |
18 uint64_t value; | 17 uint64_t value; |
19 CHECK_GE(sizeof(digest.a), sizeof(value)); | 18 DCHECK_GE(sizeof(digest.a), sizeof(value)); |
20 memcpy(&value, digest.a, sizeof(value)); | 19 memcpy(&value, digest.a, sizeof(value)); |
21 uint64_t hash = base::NetToHost64(value); | 20 return base::NetToHost64(value); |
22 CHECK_NE(0U, hash); | |
23 base::debug::Alias(&hash); | |
24 base::debug::Alias(&value); | |
25 base::debug::Alias(&digest); | |
26 return hash; | |
27 } | 21 } |
28 | 22 |
29 } // namespace | 23 } // namespace |
30 | 24 |
31 uint64_t HashMetricName(base::StringPiece name) { | 25 uint64_t HashMetricName(base::StringPiece name) { |
32 base::MD5Digest digest; | 26 base::MD5Digest digest; |
33 base::MD5Sum(name.data(), name.size(), &digest); | 27 base::MD5Sum(name.data(), name.size(), &digest); |
34 return DigestToUInt64(digest); | 28 return DigestToUInt64(digest); |
35 } | 29 } |
36 | 30 |
37 } // namespace metrics | 31 } // namespace metrics |
OLD | NEW |