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// 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 "base/metrics/metrics_hashes.h"
#include <string.h>
#include "base/check_op.h"
#include "base/hash/md5.h"
#include "base/sys_byteorder.h"
namespace base {
namespace {
// Converts the 8-byte prefix of an MD5 hash into a uint64_t value.
inline uint64_t DigestToUInt64(const base::MD5Digest& digest) {
uint64_t value;
DCHECK_GE(sizeof(digest.a), sizeof(value));
memcpy(&value, digest.a, sizeof(value));
return base::NetToHost64(value);
}
// Converts the 4-byte prefix of an MD5 hash into a uint32_t value.
inline uint32_t DigestToUInt32(const base::MD5Digest& digest) {
uint32_t value;
DCHECK_GE(sizeof(digest.a), sizeof(value));
memcpy(&value, digest.a, sizeof(value));
return base::NetToHost32(value);
}
} // namespace
uint64_t HashMetricName(base::StringPiece name) {
base::MD5Digest digest;
base::MD5Sum(name.data(), name.size(), &digest);
return DigestToUInt64(digest);
}
uint32_t HashMetricNameAs32Bits(base::StringPiece name) {
base::MD5Digest digest;
base::MD5Sum(name.data(), name.size(), &digest);
return DigestToUInt32(digest);
}
} // namespace metrics
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