52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "uploader/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 metrics {
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namespace {
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// Converts the 8-byte prefix of an MD5 hash into a uint64 value.
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inline uint64_t HashToUInt64(const std::string& hash) {
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uint64_t value;
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DCHECK_GE(hash.size(), sizeof(value));
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memcpy(&value, hash.data(), sizeof(value));
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return base::HostToNet64(value);
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}
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} // namespace
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uint64_t HashMetricName(const std::string& name) {
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// Create an MD5 hash of the given |name|, represented as a byte buffer
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// encoded as an std::string.
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base::MD5Context context;
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base::MD5Init(&context);
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base::MD5Update(&context, name);
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base::MD5Digest digest;
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base::MD5Final(&digest, &context);
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std::string hash_str(reinterpret_cast<char*>(digest.a), arraysize(digest.a));
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return HashToUInt64(hash_str);
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}
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} // namespace metrics
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