1 | /* |
2 | * Copyright (c) 2015, Intel Corporation |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions are met: |
6 | * |
7 | * * Redistributions of source code must retain the above copyright notice, |
8 | * this list of conditions and the following disclaimer. |
9 | * * Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * * Neither the name of Intel Corporation nor the names of its contributors |
13 | * may be used to endorse or promote products derived from this software |
14 | * without specific prior written permission. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
26 | * POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
28 | |
29 | /** \file |
30 | * \brief State for corpus generator. |
31 | */ |
32 | |
33 | #include "config.h" |
34 | |
35 | #include "ng_corpus_properties.h" |
36 | #include "ue2common.h" |
37 | |
38 | #include <boost/random/uniform_int_distribution.hpp> |
39 | |
40 | // default constructor |
41 | CorpusProperties::CorpusProperties() |
42 | : matchness(100), unmatchness(0), randomness(0), prefixRange(0, 0), |
43 | suffixRange(0, 0), cycleMin(1), cycleMax(1), |
44 | corpusLimit(DEFAULT_CORPUS_GENERATOR_LIMIT), editDistance(0), |
45 | alphabetSize(~0) { |
46 | // empty |
47 | } |
48 | |
49 | bool CorpusProperties::setPercentages(unsigned int match, unsigned int unmatch, |
50 | unsigned int random) { |
51 | if (match + unmatch + random != 100) { |
52 | // Do not update probabilities |
53 | return false; |
54 | } |
55 | matchness = match; |
56 | unmatchness = unmatch; |
57 | randomness = random; |
58 | return true; |
59 | } |
60 | |
61 | void CorpusProperties::seed(unsigned val) { |
62 | rngSeed = val; |
63 | randomGen.seed(val); |
64 | } |
65 | |
66 | unsigned CorpusProperties::getSeed() const { |
67 | return rngSeed; |
68 | } |
69 | |
70 | unsigned CorpusProperties::rand(unsigned n, unsigned m) { |
71 | boost::random::uniform_int_distribution<> dist(n, m); |
72 | return dist(randomGen); |
73 | } |
74 | |
75 | // not const because it stores state for the random number generator |
76 | CorpusProperties::RollResult CorpusProperties::throwDice() { |
77 | if (matchness == 100) { |
78 | return ROLLED_MATCH; |
79 | } |
80 | if (unmatchness == 100) { |
81 | return ROLLED_UNMATCH; |
82 | } |
83 | if (randomness == 100) { |
84 | return ROLLED_RANDOM; |
85 | } |
86 | |
87 | // This assumes a uniform distribution. Perhaps factor some 'depth' param |
88 | // and whether this 'depth' should increase or decrease the likelihood of |
89 | // unmatch or random rolls. |
90 | unsigned int outcome = rand(0, 99); |
91 | if (outcome < matchness) { |
92 | return ROLLED_MATCH; |
93 | } |
94 | if (outcome < matchness + unmatchness) { |
95 | return ROLLED_UNMATCH; |
96 | } |
97 | |
98 | return ROLLED_RANDOM; |
99 | } |
100 | |