[493c477] | 1 | /* emacs edit mode for this file is -*- C++ -*- */ |
---|
[2dd068] | 2 | |
---|
[9f7665] | 3 | |
---|
[e4fe2b] | 4 | #include "config.h" |
---|
[9f7665] | 5 | |
---|
[b973c0] | 6 | |
---|
[4345a0] | 7 | #include <time.h> |
---|
[2dd068] | 8 | |
---|
[650f2d8] | 9 | #include "cf_assert.h" |
---|
[b973c0] | 10 | |
---|
[2dd068] | 11 | #include "cf_defs.h" |
---|
| 12 | #include "cf_random.h" |
---|
| 13 | #include "ffops.h" |
---|
| 14 | #include "gfops.h" |
---|
| 15 | #include "imm.h" |
---|
| 16 | |
---|
[4345a0] | 17 | class RandomGenerator { |
---|
| 18 | private: |
---|
[f67df3] | 19 | const int ia, im, iq, ir, deflt; |
---|
| 20 | int s; |
---|
[4345a0] | 21 | |
---|
| 22 | // s must not equal zero! |
---|
[f67df3] | 23 | void seedInit( int ss ) { s = ((ss == 0) ? deflt : ss); } |
---|
[4345a0] | 24 | public: |
---|
[553daf] | 25 | RandomGenerator(); |
---|
[f67df3] | 26 | RandomGenerator( int ss ); |
---|
[4345a0] | 27 | ~RandomGenerator() {} |
---|
[f67df3] | 28 | int generate(); |
---|
| 29 | void seed( int ss ) { seedInit( ss ); } |
---|
[4345a0] | 30 | }; |
---|
| 31 | |
---|
[9c9e2a4] | 32 | RandomGenerator::RandomGenerator() : ia(16807), im(2147483647), iq(127773), ir(2836), deflt(123459876) |
---|
[553daf] | 33 | { |
---|
[f67df3] | 34 | seedInit( (int)time( 0 ) ); |
---|
[553daf] | 35 | } |
---|
| 36 | |
---|
[f67df3] | 37 | RandomGenerator::RandomGenerator( int ss ) : ia(16807), im(2147483647), iq(127773), ir(2836), deflt(123459876) |
---|
[553daf] | 38 | { |
---|
| 39 | seedInit( ss ); |
---|
| 40 | } |
---|
| 41 | |
---|
[f67df3] | 42 | int |
---|
[4345a0] | 43 | RandomGenerator::generate() |
---|
| 44 | { |
---|
[f67df3] | 45 | int k; |
---|
[4345a0] | 46 | |
---|
| 47 | k = s/iq; |
---|
| 48 | s = ia*(s-k*iq)-ir*k; |
---|
| 49 | if ( s < 0 ) s += im; |
---|
| 50 | |
---|
| 51 | return s; |
---|
| 52 | } |
---|
| 53 | |
---|
| 54 | RandomGenerator ranGen; |
---|
[2dd068] | 55 | |
---|
| 56 | CanonicalForm FFRandom::generate () const |
---|
| 57 | { |
---|
| 58 | return CanonicalForm( int2imm_p( factoryrandom( ff_prime ) ) ); |
---|
| 59 | } |
---|
| 60 | |
---|
| 61 | CFRandom * FFRandom::clone () const |
---|
| 62 | { |
---|
| 63 | return new FFRandom(); |
---|
| 64 | } |
---|
| 65 | |
---|
| 66 | CanonicalForm GFRandom::generate () const |
---|
| 67 | { |
---|
[08daea] | 68 | int i= factoryrandom( gf_q ); |
---|
| 69 | if ( i == gf_q1 ) i++; |
---|
| 70 | return CanonicalForm( int2imm_gf( i ) ); |
---|
[2dd068] | 71 | } |
---|
| 72 | |
---|
| 73 | CFRandom * GFRandom::clone () const |
---|
| 74 | { |
---|
| 75 | return new GFRandom(); |
---|
| 76 | } |
---|
| 77 | |
---|
| 78 | |
---|
| 79 | IntRandom::IntRandom() |
---|
| 80 | { |
---|
[afd067] | 81 | max = 50; |
---|
[2dd068] | 82 | } |
---|
| 83 | |
---|
| 84 | IntRandom::IntRandom( int m ) |
---|
| 85 | { |
---|
| 86 | max = m; |
---|
| 87 | } |
---|
| 88 | |
---|
| 89 | IntRandom::~IntRandom() {} |
---|
| 90 | |
---|
| 91 | CanonicalForm IntRandom::generate() const |
---|
| 92 | { |
---|
[afd067] | 93 | return factoryrandom( 2*max )-max; |
---|
[2dd068] | 94 | } |
---|
[b973c0] | 95 | |
---|
[2dd068] | 96 | CFRandom * IntRandom::clone() const |
---|
| 97 | { |
---|
| 98 | return new IntRandom( max ); |
---|
| 99 | } |
---|
| 100 | |
---|
| 101 | AlgExtRandomF::AlgExtRandomF() |
---|
| 102 | { |
---|
| 103 | ASSERT( 0, "not a valid random generator" ); |
---|
| 104 | } |
---|
| 105 | |
---|
| 106 | AlgExtRandomF::AlgExtRandomF( const AlgExtRandomF & ) |
---|
| 107 | { |
---|
| 108 | ASSERT( 0, "not a valid random generator" ); |
---|
| 109 | } |
---|
| 110 | |
---|
| 111 | AlgExtRandomF& AlgExtRandomF::operator= ( const AlgExtRandomF & ) |
---|
| 112 | { |
---|
| 113 | ASSERT( 0, "not a valid random generator" ); |
---|
| 114 | return *this; |
---|
| 115 | } |
---|
| 116 | |
---|
| 117 | AlgExtRandomF::AlgExtRandomF( const Variable & v ) |
---|
| 118 | { |
---|
| 119 | ASSERT( v.level() < 0, "not an algebraic extension" ); |
---|
| 120 | algext = v; |
---|
| 121 | n = degree( getMipo( v ) ); |
---|
| 122 | gen = CFRandomFactory::generate(); |
---|
| 123 | } |
---|
| 124 | |
---|
| 125 | AlgExtRandomF::AlgExtRandomF( const Variable & v1, const Variable & v2 ) |
---|
| 126 | { |
---|
| 127 | ASSERT( v1.level() < 0 && v2.level() < 0 && v1 != v2, "not an algebraic extension" ); |
---|
| 128 | algext = v2; |
---|
| 129 | n = degree( getMipo( v2 ) ); |
---|
| 130 | gen = new AlgExtRandomF( v1 ); |
---|
| 131 | } |
---|
| 132 | |
---|
| 133 | AlgExtRandomF::AlgExtRandomF( const Variable & v, CFRandom * g, int nn ) |
---|
| 134 | { |
---|
| 135 | algext = v; |
---|
| 136 | n = nn; |
---|
| 137 | gen = g; |
---|
| 138 | } |
---|
| 139 | |
---|
| 140 | AlgExtRandomF::~AlgExtRandomF() |
---|
| 141 | { |
---|
| 142 | delete gen; |
---|
| 143 | } |
---|
| 144 | |
---|
| 145 | CanonicalForm AlgExtRandomF::generate() const |
---|
| 146 | { |
---|
| 147 | CanonicalForm result; |
---|
| 148 | for ( int i = 0; i < n; i++ ) |
---|
[806c18] | 149 | result += power( algext, i ) * gen->generate(); |
---|
[2dd068] | 150 | return result; |
---|
[e76d7a6] | 151 | } |
---|
[2dd068] | 152 | |
---|
| 153 | CFRandom * AlgExtRandomF::clone () const |
---|
| 154 | { |
---|
| 155 | return new AlgExtRandomF( algext, gen->clone(), n ); |
---|
| 156 | } |
---|
| 157 | |
---|
| 158 | CFRandom * CFRandomFactory::generate() |
---|
| 159 | { |
---|
| 160 | if ( getCharacteristic() == 0 ) |
---|
[806c18] | 161 | return new IntRandom(); |
---|
[2dd068] | 162 | if ( getGFDegree() > 1 ) |
---|
[806c18] | 163 | return new GFRandom(); |
---|
[2dd068] | 164 | else |
---|
[806c18] | 165 | return new FFRandom(); |
---|
[2dd068] | 166 | } |
---|
| 167 | |
---|
| 168 | int factoryrandom( int n ) |
---|
| 169 | { |
---|
[3aca31] | 170 | if ( n == 0 ) |
---|
[806c18] | 171 | return (int)ranGen.generate(); |
---|
[3aca31] | 172 | else |
---|
[806c18] | 173 | return ranGen.generate() % n; |
---|
[2dd068] | 174 | } |
---|
| 175 | |
---|
| 176 | void factoryseed ( int s ) |
---|
| 177 | { |
---|
[4345a0] | 178 | ranGen.seed( s ); |
---|
[2dd068] | 179 | } |
---|