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Side by Side Diff: components/variations/entropy_provider.h

Issue 623133002: replace OVERRIDE and FINAL with override and final in components/ (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 2 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef COMPONENTS_VARIATIONS_ENTROPY_PROVIDER_H_ 5 #ifndef COMPONENTS_VARIATIONS_ENTROPY_PROVIDER_H_
6 #define COMPONENTS_VARIATIONS_ENTROPY_PROVIDER_H_ 6 #define COMPONENTS_VARIATIONS_ENTROPY_PROVIDER_H_
7 7
8 #include <functional> 8 #include <functional>
9 #include <string> 9 #include <string>
10 #include <vector> 10 #include <vector>
(...skipping 34 matching lines...) Expand 10 before | Expand all | Expand 10 after
45 class SHA1EntropyProvider : public base::FieldTrial::EntropyProvider { 45 class SHA1EntropyProvider : public base::FieldTrial::EntropyProvider {
46 public: 46 public:
47 // Creates a SHA1EntropyProvider with the given |entropy_source|, which 47 // Creates a SHA1EntropyProvider with the given |entropy_source|, which
48 // should contain a large amount of entropy - for example, a textual 48 // should contain a large amount of entropy - for example, a textual
49 // representation of a persistent randomly-generated 128-bit value. 49 // representation of a persistent randomly-generated 128-bit value.
50 explicit SHA1EntropyProvider(const std::string& entropy_source); 50 explicit SHA1EntropyProvider(const std::string& entropy_source);
51 virtual ~SHA1EntropyProvider(); 51 virtual ~SHA1EntropyProvider();
52 52
53 // base::FieldTrial::EntropyProvider implementation: 53 // base::FieldTrial::EntropyProvider implementation:
54 virtual double GetEntropyForTrial(const std::string& trial_name, 54 virtual double GetEntropyForTrial(const std::string& trial_name,
55 uint32 randomization_seed) const OVERRIDE; 55 uint32 randomization_seed) const override;
56 56
57 private: 57 private:
58 std::string entropy_source_; 58 std::string entropy_source_;
59 59
60 DISALLOW_COPY_AND_ASSIGN(SHA1EntropyProvider); 60 DISALLOW_COPY_AND_ASSIGN(SHA1EntropyProvider);
61 }; 61 };
62 62
63 // PermutedEntropyProvider is an entropy provider suitable for low entropy 63 // PermutedEntropyProvider is an entropy provider suitable for low entropy
64 // sources (below 16 bits). It uses the field trial name to generate a 64 // sources (below 16 bits). It uses the field trial name to generate a
65 // permutation of a mapping array from an initial entropy value to a new value. 65 // permutation of a mapping array from an initial entropy value to a new value.
66 // Note: This provider's performance is O(2^n), where n is the number of bits 66 // Note: This provider's performance is O(2^n), where n is the number of bits
67 // in the entropy source. 67 // in the entropy source.
68 class PermutedEntropyProvider : public base::FieldTrial::EntropyProvider { 68 class PermutedEntropyProvider : public base::FieldTrial::EntropyProvider {
69 public: 69 public:
70 // Creates a PermutedEntropyProvider with the given |low_entropy_source|, 70 // Creates a PermutedEntropyProvider with the given |low_entropy_source|,
71 // which should have a value in the range of [0, low_entropy_source_max). 71 // which should have a value in the range of [0, low_entropy_source_max).
72 PermutedEntropyProvider(uint16 low_entropy_source, 72 PermutedEntropyProvider(uint16 low_entropy_source,
73 size_t low_entropy_source_max); 73 size_t low_entropy_source_max);
74 virtual ~PermutedEntropyProvider(); 74 virtual ~PermutedEntropyProvider();
75 75
76 // base::FieldTrial::EntropyProvider implementation: 76 // base::FieldTrial::EntropyProvider implementation:
77 virtual double GetEntropyForTrial(const std::string& trial_name, 77 virtual double GetEntropyForTrial(const std::string& trial_name,
78 uint32 randomization_seed) const OVERRIDE; 78 uint32 randomization_seed) const override;
79 79
80 protected: 80 protected:
81 // Performs the permutation algorithm and returns the permuted value that 81 // Performs the permutation algorithm and returns the permuted value that
82 // corresponds to |low_entropy_source_|. 82 // corresponds to |low_entropy_source_|.
83 virtual uint16 GetPermutedValue(uint32 randomization_seed) const; 83 virtual uint16 GetPermutedValue(uint32 randomization_seed) const;
84 84
85 private: 85 private:
86 uint16 low_entropy_source_; 86 uint16 low_entropy_source_;
87 size_t low_entropy_source_max_; 87 size_t low_entropy_source_max_;
88 88
89 DISALLOW_COPY_AND_ASSIGN(PermutedEntropyProvider); 89 DISALLOW_COPY_AND_ASSIGN(PermutedEntropyProvider);
90 }; 90 };
91 91
92 } // namespace metrics 92 } // namespace metrics
93 93
94 #endif // COMPONENTS_VARIATIONS_ENTROPY_PROVIDER_H_ 94 #endif // COMPONENTS_VARIATIONS_ENTROPY_PROVIDER_H_
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