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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) {
- // Corresponding Python code for quick look up:
- //
- // import struct
- // import hashlib
- // struct.unpack('>Q', hashlib.md5(name.encode('utf-8')).digest()[:8])[0]
- //
- 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 base
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