| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "components/metrics/metrics_hashes.h" |
| |
| #include "base/logging.h" |
| #include "base/md5.h" |
| #include "base/sys_byteorder.h" |
| |
| namespace metrics { |
| |
| namespace { |
| |
| // Converts the 8-byte prefix of an MD5 hash into a uint64 value. |
| inline uint64 DigestToUInt64(const base::MD5Digest& digest) { |
| uint64 value; |
| DCHECK_GE(arraysize(digest.a), sizeof(value)); |
| memcpy(&value, digest.a, sizeof(value)); |
| return base::HostToNet64(value); |
| } |
| |
| } // namespace |
| |
| uint64 HashMetricName(const std::string& name) { |
| base::MD5Digest digest; |
| base::MD5Sum(name.c_str(), name.size(), &digest); |
| return DigestToUInt64(digest); |
| } |
| |
| } // namespace metrics |