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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef COMPONENTS_RAPPOR_RAPPOR_PARAMETERS_H_ |
| 6 #define COMPONENTS_RAPPOR_RAPPOR_PARAMETERS_H_ |
| 7 |
| 8 #include <string> |
| 9 |
| 10 namespace rappor { |
| 11 |
| 12 enum Probability { |
| 13 PROBABILITY_75, // 75% |
| 14 PROBABILITY_50, // 50% |
| 15 }; |
| 16 |
| 17 // An object describing a rappor metric and the parameters used to generate it. |
| 18 // |
| 19 // For a full description of the rappor metrics, see |
| 20 // http://www.chromium.org/developers/design-documents/rappor |
| 21 struct RapporParameters { |
| 22 // Get a string representing the parameters, for DCHECK_EQ. |
| 23 std::string ToString() const; |
| 24 |
| 25 // The number of bytes stored in the Bloom filter. |
| 26 int bloom_filter_size_bytes; |
| 27 // The number of hash functions used in the Bloom filter. |
| 28 int bloom_filter_hash_function_count; |
| 29 |
| 30 // The probability that a bit will be redacted with fake data. |
| 31 Probability fake_prob; |
| 32 // The probability that a fake bit will be a one. |
| 33 Probability fake_one_prob; |
| 34 |
| 35 // The probability that a one bit in the redacted data reports as one. |
| 36 Probability one_coin_prob; |
| 37 // The probability that a zero bit in the redacted data reports as one. |
| 38 Probability zero_coin_prob; |
| 39 }; |
| 40 |
| 41 } // namespace rappor |
| 42 |
| 43 #endif // COMPONENTS_RAPPOR_RAPPOR_PARAMETERS_H_ |
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