Bertrand SIMONNET | 52e5b99 | 2015-08-10 15:18:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
Alex Vakulenko | 788d3b6 | 2014-12-11 09:48:46 -0800 | [diff] [blame] | 16 | |
Bertrand SIMONNET | 4b915ae | 2015-07-28 15:38:14 -0700 | [diff] [blame] | 17 | #include "uploader/metrics_hashes.h" |
Alex Vakulenko | 788d3b6 | 2014-12-11 09:48:46 -0800 | [diff] [blame] | 18 | |
| 19 | #include "base/logging.h" |
| 20 | #include "base/md5.h" |
| 21 | #include "base/sys_byteorder.h" |
| 22 | |
| 23 | namespace metrics { |
| 24 | |
| 25 | namespace { |
| 26 | |
| 27 | // Converts the 8-byte prefix of an MD5 hash into a uint64 value. |
| 28 | inline uint64_t HashToUInt64(const std::string& hash) { |
| 29 | uint64_t value; |
| 30 | DCHECK_GE(hash.size(), sizeof(value)); |
| 31 | memcpy(&value, hash.data(), sizeof(value)); |
| 32 | return base::HostToNet64(value); |
| 33 | } |
| 34 | |
| 35 | } // namespace |
| 36 | |
| 37 | uint64_t HashMetricName(const std::string& name) { |
| 38 | // Create an MD5 hash of the given |name|, represented as a byte buffer |
| 39 | // encoded as an std::string. |
| 40 | base::MD5Context context; |
| 41 | base::MD5Init(&context); |
| 42 | base::MD5Update(&context, name); |
| 43 | |
| 44 | base::MD5Digest digest; |
| 45 | base::MD5Final(&digest, &context); |
| 46 | |
| 47 | std::string hash_str(reinterpret_cast<char*>(digest.a), arraysize(digest.a)); |
| 48 | return HashToUInt64(hash_str); |
| 49 | } |
| 50 | |
| 51 | } // namespace metrics |