[493c477] | 1 | /* emacs edit mode for this file is -*- C++ -*- */ |
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[341696] | 2 | /* $Id$ */ |
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[2dd068] | 3 | |
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[e4fe2b] | 4 | #include "config.h" |
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[b973c0] | 5 | |
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[4345a0] | 6 | #include <time.h> |
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[2dd068] | 7 | |
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[650f2d8] | 8 | #include "cf_assert.h" |
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[b973c0] | 9 | |
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[2dd068] | 10 | #include "cf_defs.h" |
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| 11 | #include "cf_random.h" |
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| 12 | #include "ffops.h" |
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| 13 | #include "gfops.h" |
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| 14 | #include "imm.h" |
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| 15 | |
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[4345a0] | 16 | class RandomGenerator { |
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| 17 | private: |
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[f67df3] | 18 | const int ia, im, iq, ir, deflt; |
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| 19 | int s; |
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[4345a0] | 20 | |
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| 21 | // s must not equal zero! |
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[f67df3] | 22 | void seedInit( int ss ) { s = ((ss == 0) ? deflt : ss); } |
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[4345a0] | 23 | public: |
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[553daf] | 24 | RandomGenerator(); |
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[f67df3] | 25 | RandomGenerator( int ss ); |
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[4345a0] | 26 | ~RandomGenerator() {} |
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[f67df3] | 27 | int generate(); |
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| 28 | void seed( int ss ) { seedInit( ss ); } |
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[4345a0] | 29 | }; |
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| 30 | |
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[9c9e2a4] | 31 | RandomGenerator::RandomGenerator() : ia(16807), im(2147483647), iq(127773), ir(2836), deflt(123459876) |
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[553daf] | 32 | { |
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[f67df3] | 33 | seedInit( (int)time( 0 ) ); |
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[553daf] | 34 | } |
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| 35 | |
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[f67df3] | 36 | RandomGenerator::RandomGenerator( int ss ) : ia(16807), im(2147483647), iq(127773), ir(2836), deflt(123459876) |
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[553daf] | 37 | { |
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| 38 | seedInit( ss ); |
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| 39 | } |
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| 40 | |
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[f67df3] | 41 | int |
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[4345a0] | 42 | RandomGenerator::generate() |
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| 43 | { |
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[f67df3] | 44 | int k; |
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[4345a0] | 45 | |
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| 46 | k = s/iq; |
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| 47 | s = ia*(s-k*iq)-ir*k; |
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| 48 | if ( s < 0 ) s += im; |
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| 49 | |
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| 50 | return s; |
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| 51 | } |
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| 52 | |
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| 53 | RandomGenerator ranGen; |
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[2dd068] | 54 | |
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| 55 | CanonicalForm FFRandom::generate () const |
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| 56 | { |
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| 57 | return CanonicalForm( int2imm_p( factoryrandom( ff_prime ) ) ); |
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| 58 | } |
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| 59 | |
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| 60 | CFRandom * FFRandom::clone () const |
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| 61 | { |
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| 62 | return new FFRandom(); |
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| 63 | } |
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| 64 | |
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| 65 | CanonicalForm GFRandom::generate () const |
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| 66 | { |
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[08daea] | 67 | int i= factoryrandom( gf_q ); |
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| 68 | if ( i == gf_q1 ) i++; |
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| 69 | return CanonicalForm( int2imm_gf( i ) ); |
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[2dd068] | 70 | } |
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| 71 | |
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| 72 | CFRandom * GFRandom::clone () const |
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| 73 | { |
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| 74 | return new GFRandom(); |
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| 75 | } |
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| 76 | |
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| 77 | |
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| 78 | IntRandom::IntRandom() |
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| 79 | { |
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[afd067] | 80 | max = 50; |
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[2dd068] | 81 | } |
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| 82 | |
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| 83 | IntRandom::IntRandom( int m ) |
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| 84 | { |
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| 85 | max = m; |
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| 86 | } |
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| 87 | |
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| 88 | IntRandom::~IntRandom() {} |
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| 89 | |
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| 90 | CanonicalForm IntRandom::generate() const |
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| 91 | { |
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[afd067] | 92 | return factoryrandom( 2*max )-max; |
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[2dd068] | 93 | } |
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[b973c0] | 94 | |
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[2dd068] | 95 | CFRandom * IntRandom::clone() const |
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| 96 | { |
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| 97 | return new IntRandom( max ); |
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| 98 | } |
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| 99 | |
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| 100 | AlgExtRandomF::AlgExtRandomF() |
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| 101 | { |
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| 102 | ASSERT( 0, "not a valid random generator" ); |
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| 103 | } |
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| 104 | |
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| 105 | AlgExtRandomF::AlgExtRandomF( const AlgExtRandomF & ) |
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| 106 | { |
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| 107 | ASSERT( 0, "not a valid random generator" ); |
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| 108 | } |
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| 109 | |
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| 110 | AlgExtRandomF& AlgExtRandomF::operator= ( const AlgExtRandomF & ) |
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| 111 | { |
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| 112 | ASSERT( 0, "not a valid random generator" ); |
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| 113 | return *this; |
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| 114 | } |
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| 115 | |
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| 116 | AlgExtRandomF::AlgExtRandomF( const Variable & v ) |
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| 117 | { |
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| 118 | ASSERT( v.level() < 0, "not an algebraic extension" ); |
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| 119 | algext = v; |
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| 120 | n = degree( getMipo( v ) ); |
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| 121 | gen = CFRandomFactory::generate(); |
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| 122 | } |
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| 123 | |
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| 124 | AlgExtRandomF::AlgExtRandomF( const Variable & v1, const Variable & v2 ) |
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| 125 | { |
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| 126 | ASSERT( v1.level() < 0 && v2.level() < 0 && v1 != v2, "not an algebraic extension" ); |
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| 127 | algext = v2; |
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| 128 | n = degree( getMipo( v2 ) ); |
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| 129 | gen = new AlgExtRandomF( v1 ); |
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| 130 | } |
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| 131 | |
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| 132 | AlgExtRandomF::AlgExtRandomF( const Variable & v, CFRandom * g, int nn ) |
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| 133 | { |
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| 134 | algext = v; |
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| 135 | n = nn; |
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| 136 | gen = g; |
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| 137 | } |
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| 138 | |
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| 139 | AlgExtRandomF::~AlgExtRandomF() |
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| 140 | { |
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| 141 | delete gen; |
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| 142 | } |
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| 143 | |
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| 144 | CanonicalForm AlgExtRandomF::generate() const |
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| 145 | { |
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| 146 | CanonicalForm result; |
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| 147 | for ( int i = 0; i < n; i++ ) |
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[806c18] | 148 | result += power( algext, i ) * gen->generate(); |
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[2dd068] | 149 | return result; |
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[e76d7a6] | 150 | } |
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[2dd068] | 151 | |
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| 152 | CFRandom * AlgExtRandomF::clone () const |
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| 153 | { |
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| 154 | return new AlgExtRandomF( algext, gen->clone(), n ); |
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| 155 | } |
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| 156 | |
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| 157 | CFRandom * CFRandomFactory::generate() |
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| 158 | { |
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| 159 | if ( getCharacteristic() == 0 ) |
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[806c18] | 160 | return new IntRandom(); |
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[2dd068] | 161 | if ( getGFDegree() > 1 ) |
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[806c18] | 162 | return new GFRandom(); |
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[2dd068] | 163 | else |
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[806c18] | 164 | return new FFRandom(); |
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[2dd068] | 165 | } |
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| 166 | |
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| 167 | int factoryrandom( int n ) |
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| 168 | { |
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[3aca31] | 169 | if ( n == 0 ) |
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[806c18] | 170 | return (int)ranGen.generate(); |
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[3aca31] | 171 | else |
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[806c18] | 172 | return ranGen.generate() % n; |
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[2dd068] | 173 | } |
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| 174 | |
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| 175 | void factoryseed ( int s ) |
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| 176 | { |
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[4345a0] | 177 | ranGen.seed( s ); |
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[2dd068] | 178 | } |
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