Various changes. Kinda in the middle of it here, but it seems to work.

[catacomb-perl] / utils.c

/* -*-c-*-
 *
 * $Id$
 *
 * Utilities for Catacomb/Perl
 *
 * (c) 2001 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of the Perl interface to Catacomb.
 *
 * Catacomb/Perl 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.
 * 
 * Catacomb/Perl 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 Catacomb/Perl; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Header files ------------------------------------------------------*/

#include "catacomb-perl.h"
#include <catacomb/ec-guts.h>
#include <catacomb/group-guts.h>
#include <catacomb/field-guts.h>

/*----- Main code ---------------------------------------------------------*/

U32 findconst(const struct consttab *cc, const char *pkg, const char *name)
{
  const char *p;
  if ((p = strrchr(name, ':')) != 0)
    name = p + 1;
  while (cc->name) {
    if (strcmp(cc->name, name) == 0)
      return (cc->val);
    cc++;
  }
  croak("unknown %s constant `%s'", pkg, name);
}

void ptrtosv(SV **sv, void *p, const char *type)
{
  if (p)
    sv_setref_pv(*sv, type, (void *)p);
  else
    *sv = &PL_sv_undef;
}

void *ptrfromsv(SV *sv, const char *type, const char *what, ...)
{
  if (!sv_derived_from(sv, type)) {
    va_list ap;
    SV *t = sv_newmortal();
    va_start(ap, what);
    sv_vsetpvfn(t, what, strlen(what), &ap, 0, 0, 0);      
    croak("%s is not of type %s", SvPVX(t), type);
  }
  return (void *)SvIV((SV *)SvRV(sv));
}

/*----- Reconstructing various objects ------------------------------------*/

/* --- Somewhat unpleasant, really --- */

field *copy_field(field *f)
{
  if (strcmp(F_NAME(f), "prime") == 0)
    f = field_prime(f->m);
  else if (strcmp(F_NAME(f), "niceprime") == 0)
    f = field_niceprime(f->m);
  else if (strcmp(F_NAME(f), "binpoly") == 0)
    f = field_binpoly(f->m);
  else if (strcmp(F_NAME(f), "binnorm") == 0) {
    fctx_binnorm *fc = (fctx_binnorm *)f;
    f = field_binnorm(f->m, fc->ntop.r[fc->ntop.n - 1]);
  } else
    f = 0;
  return (f);
}

ec_curve *copy_curve(ec_curve *c)
{
  field *f;
  mp *a, *b;

  if ((f = copy_field(c->f)) == 0)
    return (0);
  a = F_OUT(f, MP_NEW, c->a);
  b = F_OUT(f, MP_NEW, c->b);
  if (strcmp(EC_NAME(c), "prime") == 0)
    c = ec_prime(f, a, b);
  else if (strcmp(EC_NAME(c), "primeproj") == 0)
    c = ec_primeproj(f, a, b);
  if (strcmp(EC_NAME(c), "bin") == 0)
    c = ec_bin(f, a, b);
  else if (strcmp(EC_NAME(c), "binproj") == 0)
    c = ec_binproj(f, a, b);
  else
    c = 0;
  MP_DROP(a);
  MP_DROP(b);
  if (!c) F_DESTROY(f);
  return (c);
}

group *copy_group(group *g)
{
  if (strcmp(G_NAME(g), "prime") == 0) {
    gctx_prime *gc = (gctx_prime *)g;
    gprime_param gp;
    gp.g = G_TOINT(g, MP_NEW, g->g);
    gp.p = gc->mm.m;
    gp.q = gc->g.r;
    g = group_prime(&gp);
    MP_DROP(gp.g);
  } else if (strcmp(G_NAME(g), "ec") == 0) {
    gctx_ec *gc = (gctx_ec *)g;
    ec_info ei;
    if ((ei.c = copy_curve(gc->ei.c)) == 0)
      return (0);
    EC_CREATE(&ei.g);
    EC_COPY(&ei.g, &gc->ei.g);
    ei.r = MP_COPY(gc->ei.r);
    ei.h = MP_COPY(gc->ei.h);
    g = group_ec(&ei);
  } else
    g = 0;
  return (g);
}

/*----- That's all, folks -------------------------------------------------*/