1 | /* emacs edit mode for this file is -*- C++ -*- */ |
---|
2 | |
---|
3 | #include "config.h" |
---|
4 | |
---|
5 | #include <time.h> |
---|
6 | |
---|
7 | #include "cf_assert.h" |
---|
8 | |
---|
9 | #include "cf_defs.h" |
---|
10 | #include "cf_random.h" |
---|
11 | #include "ffops.h" |
---|
12 | #include "gfops.h" |
---|
13 | #include "imm.h" |
---|
14 | |
---|
15 | class RandomGenerator { |
---|
16 | private: |
---|
17 | const int ia, im, iq, ir, deflt; |
---|
18 | int s; |
---|
19 | |
---|
20 | // s must not equal zero! |
---|
21 | void seedInit( int ss ) { s = ((ss == 0) ? deflt : ss); } |
---|
22 | public: |
---|
23 | RandomGenerator(); |
---|
24 | RandomGenerator( int ss ); |
---|
25 | ~RandomGenerator() {} |
---|
26 | int generate(); |
---|
27 | void seed( int ss ) { seedInit( ss ); } |
---|
28 | }; |
---|
29 | |
---|
30 | RandomGenerator::RandomGenerator() : ia(16807), im(2147483647), iq(127773), ir(2836), deflt(123459876) |
---|
31 | { |
---|
32 | seedInit( (int)time( 0 ) ); |
---|
33 | } |
---|
34 | |
---|
35 | RandomGenerator::RandomGenerator( int ss ) : ia(16807), im(2147483647), iq(127773), ir(2836), deflt(123459876) |
---|
36 | { |
---|
37 | seedInit( ss ); |
---|
38 | } |
---|
39 | |
---|
40 | int |
---|
41 | RandomGenerator::generate() |
---|
42 | { |
---|
43 | int k; |
---|
44 | |
---|
45 | k = s/iq; |
---|
46 | s = ia*(s-k*iq)-ir*k; |
---|
47 | if ( s < 0 ) s += im; |
---|
48 | |
---|
49 | return s; |
---|
50 | } |
---|
51 | |
---|
52 | RandomGenerator ranGen; |
---|
53 | |
---|
54 | CanonicalForm FFRandom::generate () const |
---|
55 | { |
---|
56 | return CanonicalForm( int2imm_p( factoryrandom( ff_prime ) ) ); |
---|
57 | } |
---|
58 | |
---|
59 | CFRandom * FFRandom::clone () const |
---|
60 | { |
---|
61 | return new FFRandom(); |
---|
62 | } |
---|
63 | |
---|
64 | CanonicalForm GFRandom::generate () const |
---|
65 | { |
---|
66 | int i= factoryrandom( gf_q ); |
---|
67 | if ( i == gf_q1 ) i++; |
---|
68 | return CanonicalForm( int2imm_gf( i ) ); |
---|
69 | } |
---|
70 | |
---|
71 | CFRandom * GFRandom::clone () const |
---|
72 | { |
---|
73 | return new GFRandom(); |
---|
74 | } |
---|
75 | |
---|
76 | |
---|
77 | IntRandom::IntRandom() |
---|
78 | { |
---|
79 | max = 50; |
---|
80 | } |
---|
81 | |
---|
82 | IntRandom::IntRandom( int m ) |
---|
83 | { |
---|
84 | max = m; |
---|
85 | } |
---|
86 | |
---|
87 | IntRandom::~IntRandom() {} |
---|
88 | |
---|
89 | CanonicalForm IntRandom::generate() const |
---|
90 | { |
---|
91 | return factoryrandom( 2*max )-max; |
---|
92 | } |
---|
93 | |
---|
94 | CFRandom * IntRandom::clone() const |
---|
95 | { |
---|
96 | return new IntRandom( max ); |
---|
97 | } |
---|
98 | |
---|
99 | AlgExtRandomF::AlgExtRandomF() |
---|
100 | { |
---|
101 | ASSERT( 0, "not a valid random generator" ); |
---|
102 | } |
---|
103 | |
---|
104 | AlgExtRandomF::AlgExtRandomF( const AlgExtRandomF & ) |
---|
105 | { |
---|
106 | ASSERT( 0, "not a valid random generator" ); |
---|
107 | } |
---|
108 | |
---|
109 | AlgExtRandomF& AlgExtRandomF::operator= ( const AlgExtRandomF & ) |
---|
110 | { |
---|
111 | ASSERT( 0, "not a valid random generator" ); |
---|
112 | return *this; |
---|
113 | } |
---|
114 | |
---|
115 | AlgExtRandomF::AlgExtRandomF( const Variable & v ) |
---|
116 | { |
---|
117 | ASSERT( v.level() < 0, "not an algebraic extension" ); |
---|
118 | algext = v; |
---|
119 | n = degree( getMipo( v ) ); |
---|
120 | gen = CFRandomFactory::generate(); |
---|
121 | } |
---|
122 | |
---|
123 | AlgExtRandomF::AlgExtRandomF( const Variable & v1, const Variable & v2 ) |
---|
124 | { |
---|
125 | ASSERT( v1.level() < 0 && v2.level() < 0 && v1 != v2, "not an algebraic extension" ); |
---|
126 | algext = v2; |
---|
127 | n = degree( getMipo( v2 ) ); |
---|
128 | gen = new AlgExtRandomF( v1 ); |
---|
129 | } |
---|
130 | |
---|
131 | AlgExtRandomF::AlgExtRandomF( const Variable & v, CFRandom * g, int nn ) |
---|
132 | { |
---|
133 | algext = v; |
---|
134 | n = nn; |
---|
135 | gen = g; |
---|
136 | } |
---|
137 | |
---|
138 | AlgExtRandomF::~AlgExtRandomF() |
---|
139 | { |
---|
140 | delete gen; |
---|
141 | } |
---|
142 | |
---|
143 | CanonicalForm AlgExtRandomF::generate() const |
---|
144 | { |
---|
145 | CanonicalForm result; |
---|
146 | for ( int i = 0; i < n; i++ ) |
---|
147 | result += power( algext, i ) * gen->generate(); |
---|
148 | return result; |
---|
149 | } |
---|
150 | |
---|
151 | CFRandom * AlgExtRandomF::clone () const |
---|
152 | { |
---|
153 | return new AlgExtRandomF( algext, gen->clone(), n ); |
---|
154 | } |
---|
155 | |
---|
156 | CFRandom * CFRandomFactory::generate() |
---|
157 | { |
---|
158 | if ( getCharacteristic() == 0 ) |
---|
159 | return new IntRandom(); |
---|
160 | if ( getGFDegree() > 1 ) |
---|
161 | return new GFRandom(); |
---|
162 | else |
---|
163 | return new FFRandom(); |
---|
164 | } |
---|
165 | |
---|
166 | int factoryrandom( int n ) |
---|
167 | { |
---|
168 | if ( n == 0 ) |
---|
169 | return (int)ranGen.generate(); |
---|
170 | else |
---|
171 | return ranGen.generate() % n; |
---|
172 | } |
---|
173 | |
---|
174 | void factoryseed ( int s ) |
---|
175 | { |
---|
176 | ranGen.seed( s ); |
---|
177 | } |
---|