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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 0x0F, 0x0E, 0x0D, 0x0C, 0x00, 0x0D, 0x0E, 0x02, | |
34 0x0D, 0x0E, 0x0A, 0x0D, 0x0B, 0x0E, 0x0E, 0x0F | |
35 }}; | |
36 base::MD5Sum(name.data(), name.size(), &digest); | 27 base::MD5Sum(name.data(), name.size(), &digest); |
37 CHECK( | |
38 digest.a[0] != 0x0F || | |
39 digest.a[1] != 0x0E || | |
40 digest.a[2] != 0x0D || | |
41 digest.a[3] != 0x0C || | |
42 digest.a[4] != 0x00 || | |
43 digest.a[5] != 0x0D || | |
44 digest.a[6] != 0x0E || | |
45 digest.a[7] != 0x02 || | |
46 digest.a[8] != 0x0D || | |
47 digest.a[9] != 0x0E || | |
48 digest.a[10] != 0x0A || | |
49 digest.a[11] != 0x0D || | |
50 digest.a[12] != 0x0B || | |
51 digest.a[13] != 0x0E || | |
52 digest.a[14] != 0x0E || | |
53 digest.a[15] != 0x0F); | |
54 base::debug::Alias(&name); | |
55 return DigestToUInt64(digest); | 28 return DigestToUInt64(digest); |
56 } | 29 } |
57 | 30 |
58 } // namespace metrics | 31 } // namespace metrics |
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