1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/* parifact.cc: integer factorization using libpari, interface via strings */
//////////////////////////////////////////////////////////////////////////
//
// Copyright 1990-2023 John Cremona
//
// This file is part of the eclib package.
//
// eclib is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2 of the License, or (at your
// option) any later version.
//
// eclib is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eclib; if not, write to the Free Software Foundation,
// Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
//
//////////////////////////////////////////////////////////////////////////
#include <eclib/parifact.h>
#include <eclib/interface.h> // for getenv_with_default
#include <pari/pari.h>
//#define DEBUG_GPFACT
#include <iostream>
#define DEFAULT_PARI_SIZE 100000000
#define DEFAULT_PARI_MAX_PRIME 1000000
void eclib_pari_init(long max_prime=DEFAULT_PARI_MAX_PRIME)
{
if (!avma) {
long pari_size = strtol(getenv_with_default("PARI_SIZE", "DEFAULT_PARI_SIZE").c_str(), NULL, 0);
if (pari_size==0) // e.g. syntax error in the environment variable PARI_SIZE
pari_size = DEFAULT_PARI_SIZE;
#ifdef DEBUG_GPFACT
std::cout<<"calling pari_init with pari_size = "<<pari_size<<endl;
#endif
// the first parameter is the maximum stack size in bytes
// the second parameter is the maximum precomputed prime
pari_init(pari_size, max_prime);
}
}
string
factor(const string n)
{
eclib_pari_init();
pari_sp av=avma; // store pari stack pointer
#ifdef DEBUG_GPFACT
std::cout<<"factor called with "<<n<<endl;
#endif
GEN x = strtoi(n.c_str());
setsigne(x,1);
x = gel(Z_factor(x),1);
settyp(x,t_VEC);
string ans(GENtostr(x));
#ifdef DEBUG_GPFACT
std::cout<<"factor returns "<<ans<<endl;
#endif
avma=av; // restore pari stackpointer
return ans;
}
int
is_prime(const string p)
{
eclib_pari_init();
pari_sp av=avma; // store pari stack pointer
#ifdef DEBUG_GPFACT
std::cout<<"is_prime called with "<<p<<"..."<<flush;
#endif
int ans = (isprime((GEN)strtoi(p.c_str()))==1);
#ifdef DEBUG_GPFACT
std::cout<<"and returns "<<ans<<std::endl;
#endif
avma=av; // restore pari stackpointer
return ans;
}
//#define DEBUG_ELLAP 1
long
ellap(long a1, long a2, long a3, long a4, long a6, long p)
{
eclib_pari_init();
pari_sp av=avma; // store pari stack pointer
#ifdef DEBUG_ELLAP
std::cout<<"ellap called with ["<<a1<<","<<a2<<","<<a3<<","<<a4<<","<<a6<<"], p="<<p<<endl;
#endif
GEN ai = mkvecn(5, stoi(a1), stoi(a2), stoi(a3), stoi(a4), stoi(a6));
GEN pp = stoi(p);
long ap = itos(ellap(ellinit(ai, pp, 0), pp));
#ifdef DEBUG_ELLAP
std::cout<<"ellap returns "<<ap<<endl;
#endif
avma=av; // restore pari stackpointer
return ap;
}
|
