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 */
16
17#ifndef SIMPLE_PERF_BUILD_ID_H_
18#define SIMPLE_PERF_BUILD_ID_H_
19
20#include <string.h>
21#include <algorithm>
22#include <android-base/stringprintf.h>
23
24constexpr size_t BUILD_ID_SIZE = 20;
25
26class BuildId {
27 public:
28  static size_t Size() {
29    return BUILD_ID_SIZE;
30  }
31
32  BuildId() {
33    memset(data_, '\0', BUILD_ID_SIZE);
34  }
35
36  // Copy build id from a byte array, like {0x76, 0x00, 0x32,...}.
37  BuildId(const void* data, size_t len) : BuildId() {
38    memcpy(data_, data, std::min(len, BUILD_ID_SIZE));
39  }
40
41  // Read build id from a hex string, like "7600329e31058e12b145d153ef27cd40e1a5f7b9".
42  explicit BuildId(const std::string& s) : BuildId() {
43    for (size_t i = 0; i < s.size() && i < BUILD_ID_SIZE * 2; i += 2) {
44      unsigned char ch = 0;
45      for (size_t j = i; j < i + 2; ++j) {
46        ch <<= 4;
47        if (s[j] >= '0' && s[j] <= '9') {
48          ch |= s[j] - '0';
49        } else if (s[j] >= 'a' && s[j] <= 'f') {
50          ch |= s[j] - 'a' + 10;
51        } else if (s[j] >= 'A' && s[j] <= 'F') {
52          ch |= s[j] - 'A' + 10;
53        }
54      }
55      data_[i / 2] = ch;
56    }
57  }
58
59  const unsigned char* Data() const {
60    return data_;
61  }
62
63  std::string ToString() const {
64    std::string s = "0x";
65    for (size_t i = 0; i < BUILD_ID_SIZE; ++i) {
66      s += android::base::StringPrintf("%02x", data_[i]);
67    }
68    return s;
69  }
70
71  bool operator==(const BuildId& build_id) const {
72    return memcmp(data_, build_id.data_, BUILD_ID_SIZE) == 0;
73  }
74
75  bool operator!=(const BuildId& build_id) const {
76    return !(*this == build_id);
77  }
78
79  bool IsEmpty() const {
80    static BuildId empty_build_id;
81    return *this == empty_build_id;
82  }
83
84 private:
85  unsigned char data_[BUILD_ID_SIZE];
86};
87
88#endif  // SIMPLE_PERF_BUILD_ID_H_
89