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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 "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 HashToUInt64(const std::string& hash) {
uint64 value;
DCHECK_GE(hash.size(), sizeof(value));
memcpy(&value, hash.data(), sizeof(value));
return base::HostToNet64(value);
}
} // namespace
uint64 HashMetricName(const std::string& name) {
// Create an MD5 hash of the given |name|, represented as a byte buffer
// encoded as an std::string.
base::MD5Context context;
base::MD5Init(&context);
base::MD5Update(&context, name);
base::MD5Digest digest;
base::MD5Final(&digest, &context);
std::string hash_str(reinterpret_cast<char*>(digest.a), arraysize(digest.a));
return HashToUInt64(hash_str);
}
} // namespace metrics
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