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32 lines
801 B
C++
32 lines
801 B
C++
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// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/metrics/metrics_hashes.h"
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#include "base/logging.h"
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#include "base/md5.h"
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#include "base/sys_byteorder.h"
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namespace base {
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namespace {
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// Converts the 8-byte prefix of an MD5 hash into a uint64_t value.
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inline uint64_t DigestToUInt64(const base::MD5Digest& digest) {
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uint64_t value;
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DCHECK_GE(sizeof(digest.a), sizeof(value));
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memcpy(&value, digest.a, sizeof(value));
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return base::NetToHost64(value);
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}
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} // namespace
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uint64_t HashMetricName(base::StringPiece name) {
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base::MD5Digest digest;
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base::MD5Sum(name.data(), name.size(), &digest);
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return DigestToUInt64(digest);
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}
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} // namespace metrics
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