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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #include "components/metrics/metrics_hashes.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/md5.h" | |
9 #include "base/sys_byteorder.h" | |
10 | |
11 namespace metrics { | |
12 | |
13 namespace { | |
14 | |
15 // Converts the 8-byte prefix of an MD5 hash into a uint64 value. | |
16 inline uint64 DigestToUInt64(const base::MD5Digest& digest) { | |
17 uint64 value; | |
18 DCHECK_GE(arraysize(digest.a), sizeof(value)); | |
19 memcpy(&value, digest.a, sizeof(value)); | |
20 return base::HostToNet64(value); | |
21 } | |
22 | |
23 } // namespace | |
24 | |
25 uint64 HashMetricName(const std::string& name) { | |
26 base::MD5Digest digest; | |
27 base::MD5Sum(name.c_str(), name.size(), &digest); | |
28 return DigestToUInt64(digest); | |
29 } | |
30 | |
31 } // namespace metrics | |
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