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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" |
7 #include "base/logging.h" | 8 #include "base/logging.h" |
8 #include "base/md5.h" | 9 #include "base/md5.h" |
9 #include "base/sys_byteorder.h" | 10 #include "base/sys_byteorder.h" |
10 | 11 |
11 namespace base { | 12 namespace base { |
12 | 13 |
13 namespace { | 14 namespace { |
14 | 15 |
15 // Converts the 8-byte prefix of an MD5 hash into a uint64_t value. | 16 // Converts the 8-byte prefix of an MD5 hash into a uint64_t value. |
16 inline uint64_t DigestToUInt64(const base::MD5Digest& digest) { | 17 inline uint64_t DigestToUInt64(const base::MD5Digest& digest) { |
17 uint64_t value; | 18 uint64_t value; |
18 DCHECK_GE(sizeof(digest.a), sizeof(value)); | 19 CHECK_GE(sizeof(digest.a), sizeof(value)); |
19 memcpy(&value, digest.a, sizeof(value)); | 20 memcpy(&value, digest.a, sizeof(value)); |
20 return base::NetToHost64(value); | 21 uint64_t hash = 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; |
21 } | 27 } |
22 | 28 |
23 } // namespace | 29 } // namespace |
24 | 30 |
25 uint64_t HashMetricName(base::StringPiece name) { | 31 uint64_t HashMetricName(base::StringPiece name) { |
26 base::MD5Digest digest; | 32 base::MD5Digest digest = {{ |
| 33 0x0F, 0x0E, 0x0D, 0x0C, 0x00, 0x0D, 0x0E, 0x02, |
| 34 0x0D, 0x0E, 0x0A, 0x0D, 0x0B, 0x0E, 0x0E, 0x0F |
| 35 }}; |
27 base::MD5Sum(name.data(), name.size(), &digest); | 36 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); |
28 return DigestToUInt64(digest); | 55 return DigestToUInt64(digest); |
29 } | 56 } |
30 | 57 |
31 } // namespace metrics | 58 } // namespace metrics |
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