mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 06:16:30 +03:00
54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
// 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 metrics
|