[493c477] | 1 | /* emacs edit mode for this file is -*- C++ -*- */ |
---|
[341696] | 2 | /* $Id$ */ |
---|
[2dd068] | 3 | |
---|
[ab4548f] | 4 | #include <config.h> |
---|
| 5 | |
---|
[2dd068] | 6 | #include "assert.h" |
---|
[ab4548f] | 7 | |
---|
[2dd068] | 8 | #include "cf_defs.h" |
---|
| 9 | #include "cf_generator.h" |
---|
| 10 | #include "imm.h" |
---|
| 11 | #include "gfops.h" |
---|
| 12 | #include "ffops.h" |
---|
| 13 | |
---|
| 14 | bool FFGenerator::hasItems() const |
---|
| 15 | { |
---|
| 16 | return current < ff_prime; |
---|
| 17 | } |
---|
| 18 | |
---|
| 19 | CanonicalForm FFGenerator::item() const |
---|
| 20 | { |
---|
| 21 | ASSERT( current < ff_prime, "no more items" ); |
---|
| 22 | return CanonicalForm( int2imm_p( current ) ); |
---|
| 23 | } |
---|
| 24 | |
---|
| 25 | void FFGenerator::next() |
---|
| 26 | { |
---|
| 27 | ASSERT( current < ff_prime, "no more items" ); |
---|
| 28 | current++; |
---|
| 29 | } |
---|
| 30 | |
---|
| 31 | |
---|
| 32 | GFGenerator::GFGenerator() |
---|
| 33 | { |
---|
| 34 | current = gf_zero(); |
---|
| 35 | } |
---|
| 36 | |
---|
| 37 | bool GFGenerator::hasItems() const |
---|
| 38 | { |
---|
| 39 | return ( current != gf_q + 1 ); |
---|
| 40 | } |
---|
| 41 | |
---|
| 42 | void GFGenerator::reset() |
---|
| 43 | { |
---|
| 44 | current = gf_zero(); |
---|
| 45 | } |
---|
| 46 | |
---|
| 47 | CanonicalForm GFGenerator::item() const |
---|
| 48 | { |
---|
| 49 | ASSERT( current != gf_q + 1, "no more items" ); |
---|
| 50 | return CanonicalForm( int2imm_gf( current ) ); |
---|
| 51 | } |
---|
| 52 | |
---|
| 53 | void GFGenerator::next() |
---|
| 54 | { |
---|
| 55 | ASSERT( current != gf_q + 1, "no more items" ); |
---|
| 56 | if ( gf_iszero( current ) ) |
---|
| 57 | current = 0; |
---|
| 58 | else if ( current == gf_q1 - 1 ) |
---|
| 59 | current = gf_q + 1; |
---|
| 60 | else |
---|
| 61 | current++; |
---|
| 62 | } |
---|
| 63 | |
---|
| 64 | AlgExtGenerator::AlgExtGenerator() |
---|
| 65 | { |
---|
| 66 | ASSERT( 0, "not a valid generator" ); |
---|
| 67 | } |
---|
| 68 | |
---|
| 69 | AlgExtGenerator::AlgExtGenerator( const AlgExtGenerator & ) |
---|
| 70 | { |
---|
| 71 | ASSERT( 0, "not a valid generator" ); |
---|
[ab4548f] | 72 | } |
---|
[2dd068] | 73 | |
---|
| 74 | AlgExtGenerator& AlgExtGenerator::operator= ( const AlgExtGenerator & ) |
---|
| 75 | { |
---|
| 76 | ASSERT( 0, "not a valid generator" ); |
---|
| 77 | return *this; |
---|
| 78 | } |
---|
| 79 | |
---|
| 80 | AlgExtGenerator::AlgExtGenerator( const Variable & a ) |
---|
| 81 | { |
---|
| 82 | ASSERT( a.level() < 0, "not an algebraic extension" ); |
---|
| 83 | ASSERT( getCharacteristic() > 0, "not a finite field" ); |
---|
| 84 | algext = a; |
---|
| 85 | n = degree( getMipo( a ) ); |
---|
[b96e07] | 86 | if ( getGFDegree() > 1 ) |
---|
| 87 | { |
---|
| 88 | gensg = new GFGenerator * [n]; |
---|
| 89 | for ( int i = 0; i < n; i++ ) |
---|
| 90 | gensg[i] = new GFGenerator(); |
---|
| 91 | } |
---|
| 92 | else |
---|
| 93 | { |
---|
| 94 | gensf = new FFGenerator * [n]; |
---|
| 95 | for ( int i = 0; i < n; i++ ) |
---|
| 96 | gensf[i] = new FFGenerator(); |
---|
| 97 | } |
---|
[2dd068] | 98 | nomoreitems = false; |
---|
| 99 | } |
---|
| 100 | |
---|
| 101 | AlgExtGenerator::~AlgExtGenerator() |
---|
| 102 | { |
---|
[b96e07] | 103 | if ( getGFDegree() > 1 ) |
---|
| 104 | { |
---|
| 105 | for ( int i = 0; i < n; i++ ) |
---|
| 106 | delete gensg[i]; |
---|
| 107 | delete [] gensg; |
---|
| 108 | } |
---|
| 109 | else |
---|
| 110 | { |
---|
| 111 | for ( int i = 0; i < n; i++ ) |
---|
| 112 | delete gensf[i]; |
---|
| 113 | delete [] gensf; |
---|
| 114 | } |
---|
[2dd068] | 115 | } |
---|
| 116 | |
---|
| 117 | void AlgExtGenerator::reset() |
---|
| 118 | { |
---|
[b96e07] | 119 | if ( getGFDegree() > 1 ) |
---|
| 120 | { |
---|
| 121 | for ( int i = 0; i < n; i++ ) |
---|
| 122 | gensg[i]->reset(); |
---|
| 123 | } |
---|
| 124 | else |
---|
| 125 | { |
---|
| 126 | for ( int i = 0; i < n; i++ ) |
---|
| 127 | gensf[i]->reset(); |
---|
| 128 | } |
---|
[2dd068] | 129 | nomoreitems = false; |
---|
| 130 | } |
---|
| 131 | |
---|
| 132 | CanonicalForm AlgExtGenerator::item() const |
---|
| 133 | { |
---|
| 134 | ASSERT( ! nomoreitems, "no more items" ); |
---|
| 135 | CanonicalForm result = 0; |
---|
[b96e07] | 136 | if ( getGFDegree() > 1 ) |
---|
| 137 | { |
---|
| 138 | for ( int i = 0; i < n; i++ ) |
---|
| 139 | result += power( algext, i ) * gensg[i]->item(); |
---|
| 140 | } |
---|
| 141 | else |
---|
| 142 | { |
---|
| 143 | for ( int i = 0; i < n; i++ ) |
---|
| 144 | result += power( algext, i ) * gensf[i]->item(); |
---|
| 145 | } |
---|
[2dd068] | 146 | return result; |
---|
| 147 | } |
---|
| 148 | |
---|
| 149 | void AlgExtGenerator::next() |
---|
| 150 | { |
---|
| 151 | ASSERT( ! nomoreitems, "no more items" ); |
---|
| 152 | int i = 0; |
---|
| 153 | bool stop = false; |
---|
[b96e07] | 154 | if ( getGFDegree() > 1 ) |
---|
| 155 | { |
---|
| 156 | while ( ! stop && i < n ) |
---|
| 157 | { |
---|
| 158 | gensg[i]->next(); |
---|
| 159 | if ( ! gensg[i]->hasItems() ) |
---|
| 160 | { |
---|
| 161 | gensg[i]->reset(); |
---|
| 162 | i++; |
---|
| 163 | } |
---|
| 164 | else |
---|
| 165 | stop = true; |
---|
| 166 | } |
---|
| 167 | } |
---|
| 168 | else |
---|
| 169 | { |
---|
| 170 | while ( ! stop && i < n ) |
---|
| 171 | { |
---|
| 172 | gensf[i]->next(); |
---|
| 173 | if ( ! gensf[i]->hasItems() ) |
---|
| 174 | { |
---|
| 175 | gensf[i]->reset(); |
---|
| 176 | i++; |
---|
| 177 | } |
---|
| 178 | else |
---|
| 179 | stop = true; |
---|
| 180 | } |
---|
[2dd068] | 181 | } |
---|
| 182 | if ( ! stop ) |
---|
| 183 | nomoreitems = true; |
---|
| 184 | } |
---|
| 185 | |
---|
| 186 | CFGenerator * CFGenFactory::generate() |
---|
| 187 | { |
---|
| 188 | ASSERT( getCharacteristic() > 0, "not a finite field" ); |
---|
| 189 | if ( getGFDegree() > 1 ) |
---|
| 190 | return new GFGenerator(); |
---|
| 191 | else |
---|
| 192 | return new FFGenerator(); |
---|
| 193 | } |
---|