chiark - git - mdw - catacomb-python/blob - field.c

   1 /* -*-c-*-
   2  *
   3  * Abstract fields
   4  *
   5  * (c) 2004 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the Python interface to Catacomb.
  11  *
  12  * Catacomb/Python is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * Catacomb/Python is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with Catacomb/Python; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include "catacomb-python.h"
  30
  31 /*----- Various utilities -------------------------------------------------*/
  32
  33 PyTypeObject *field_pytype;
  34 PyTypeObject *primefield_pytype;
  35 PyTypeObject *niceprimefield_pytype;
  36 PyTypeObject *binfield_pytype;
  37 PyTypeObject *binpolyfield_pytype;
  38 PyTypeObject *binnormfield_pytype;
  39 PyTypeObject *fe_pytype;
  40
  41 static PyObject *fe_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
  42 {
  43   PyObject *x;
  44   mp *z;
  45   char *kwlist[] = { "x", 0 };
  46
  47   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O:fe", kwlist, &x))
  48     return (0);
  49   if (FE_PYCHECK(x) && FE_F(x) == FIELD_F(ty)) RETURN_OBJ(x);
  50   if ((z = getmp(x)) == 0) return (0);
  51   z = F_IN(FIELD_F(ty), z, z);
  52   return (fe_pywrap((PyObject *)ty, z));
  53 }
  54
  55 static PyObject *field_dopywrap(PyTypeObject *ty, field *f)
  56 {
  57   field_pyobj *fobj = newtype(ty, 0, f->ops->name);
  58   fobj->f = f;
  59   fobj->ty.ht_type.tp_basicsize = sizeof(fe_pyobj);
  60   fobj->ty.ht_type.tp_base = fe_pytype;
  61   Py_INCREF(fe_pytype);
  62   fobj->ty.ht_type.tp_flags = (Py_TPFLAGS_DEFAULT |
  63                                Py_TPFLAGS_BASETYPE |
  64                                Py_TPFLAGS_CHECKTYPES |
  65                                Py_TPFLAGS_HEAPTYPE);
  66   fobj->ty.ht_type.tp_alloc = PyType_GenericAlloc;
  67   fobj->ty.ht_type.tp_free = 0;
  68   fobj->ty.ht_type.tp_new = fe_pynew;
  69   PyType_Ready(&fobj->ty.ht_type);
  70   return ((PyObject *)fobj);
  71 }
  72
  73 PyObject *field_pywrap(field *f)
  74 {
  75   PyTypeObject *ty;
  76
  77   if (strcmp(F_NAME(f), "prime") == 0) ty = primefield_pytype;
  78   else if (strcmp(F_NAME(f), "niceprime") == 0) ty = niceprimefield_pytype;
  79   else if (strcmp(F_NAME(f), "binpoly") == 0) ty = binpolyfield_pytype;
  80   else if (strcmp(F_NAME(f), "binnorm") == 0) ty = binnormfield_pytype;
  81   else abort();
  82   return (field_dopywrap(ty, f));
  83 }
  84
  85 field *field_copy(field *f)
  86 {
  87   if (strcmp(F_NAME(f), "prime") == 0)
  88     f = field_prime(f->m);
  89   else if (strcmp(F_NAME(f), "niceprime") == 0)
  90     f = field_niceprime(f->m);
  91   else if (strcmp(F_NAME(f), "binpoly") == 0)
  92     f = field_binpoly(f->m);
  93   else if (strcmp(F_NAME(f), "binnorm") == 0) {
  94     fctx_binnorm *fc = (fctx_binnorm *)f;
  95     f = field_binnorm(f->m, fc->ntop.r[fc->ntop.n - 1]);
  96   } else
  97     abort();
  98   return (f);
  99 }
 100
 101 PyObject *fe_pywrap(PyObject *fobj, mp *x)
 102 {
 103   fe_pyobj *z = PyObject_New(fe_pyobj, (PyTypeObject *)fobj);
 104   z->f = FIELD_F(fobj);
 105   Py_INCREF(fobj);
 106   z->x = x;
 107   return ((PyObject *)z);
 108 }
 109
 110 static mp *tofe(field *f, PyObject *o)
 111 {
 112   mp *x = 0, *y = 0;
 113
 114   if (FE_PYCHECK(o)) {
 115     if (FE_F(o) != f && !field_samep(FE_F(o), f)) return (0);
 116     y = MP_COPY(FE_X(o));
 117   } else if ((x = tomp(o)) != 0) {
 118     if (MP_ZEROP(x))
 119       y = MP_COPY(f->zero);
 120     else if (MP_EQ(x, MP_ONE))
 121       y = MP_COPY(f->one);
 122     else
 123       y = F_IN(f, MP_NEW, x);
 124     MP_DROP(x);
 125   }
 126   return (y);
 127 }
 128
 129 mp *getfe(field *f, PyObject *o)
 130 {
 131   mp *x = 0;
 132   if ((x = tofe(f, o)) == 0) {
 133     PyErr_Format(PyExc_TypeError, "can't convert %.100s to fe",
 134                  o->ob_type->tp_name);
 135   }
 136   return (x);
 137 }
 138
 139 /*----- Field elements ----------------------------------------------------*/
 140
 141 static int febinop(PyObject *x, PyObject *y,
 142                    field **f, PyObject **fobj, mp **xx, mp **yy)
 143 {
 144   if (FE_PYCHECK(x)) *fobj = FE_FOBJ(x);
 145   else if (FE_PYCHECK(y)) *fobj = FE_FOBJ(y);
 146   else return (-1);
 147   *f = FIELD_F(*fobj);
 148   if ((*xx = tofe(*f, x)) == 0)
 149     return (-1);
 150   if ((*yy = tofe(*f, y)) == 0) {
 151     MP_DROP(*xx);
 152     return (-1);
 153   }
 154   return (0);
 155 }
 156
 157 #define BINOP(name)                                                     \
 158   static PyObject *fe_py##name(PyObject *x, PyObject *y) {              \
 159     PyObject *fobj;                                                     \
 160     field *ff;                                                          \
 161     mp *xx, *yy, *zz;                                                   \
 162     if (febinop(x, y, &ff, &fobj, &xx, &yy)) RETURN_NOTIMPL;            \
 163     zz = ff->ops->name(ff, MP_NEW, xx, yy);                             \
 164     MP_DROP(xx); MP_DROP(yy);                                           \
 165     return (fe_pywrap(fobj, zz));                                       \
 166   }
 167 BINOP(add)
 168 BINOP(sub)
 169 BINOP(mul)
 170 #undef BINOP
 171
 172 static PyObject *fe_pydiv(PyObject *x, PyObject *y)
 173 {
 174   PyObject *fobj;
 175   field *ff;
 176   mp *xx, *yy;
 177   PyObject *z = 0;
 178   if (febinop(x, y, &ff, &fobj, &xx, &yy)) RETURN_NOTIMPL;
 179   if (F_ZEROP(ff, yy)) ZDIVERR("division by zero");
 180   yy = F_INV(ff, yy, yy);
 181   z = fe_pywrap(fobj, F_MUL(ff, MP_NEW, xx, yy));
 182 end:
 183   MP_DROP(xx); MP_DROP(yy);
 184   return (z);
 185 }
 186
 187 static PyObject *fe_pyexp(PyObject *x, PyObject *y, PyObject *z)
 188 {
 189   field *ff;
 190   mp *xx, *yy;
 191
 192   if (z != Py_None || !FE_PYCHECK(x) || (yy = tomp(y)) == 0)
 193     RETURN_NOTIMPL;
 194   ff = FE_F(x); xx = FE_X(x); MP_COPY(xx);
 195   if (MP_NEGP(yy) && F_ZEROP(ff, xx)) ZDIVERR("division by zero");
 196   z = fe_pywrap(FE_FOBJ(x), field_exp(ff, MP_NEW, xx, yy));
 197 end:
 198   MP_DROP(xx); MP_DROP(yy);
 199   return (z);
 200 }
 201
 202 static PyObject *fe_pyneg(PyObject *x)
 203 {
 204   return fe_pywrap(FE_FOBJ(x), FE_F(x)->ops->neg(FE_F(x), MP_NEW, FE_X(x)));
 205 }
 206
 207 static PyObject *fe_pyid(PyObject *x) { RETURN_OBJ(x); }
 208
 209 static int fe_pynonzerop(PyObject *x) { return !F_ZEROP(FE_F(x), FE_X(x)); }
 210
 211 static PyObject *fe_pyrichcompare(PyObject *x, PyObject *y, int op)
 212 {
 213   PyObject *fobj;
 214   field *ff;
 215   mp *xx, *yy;
 216   int b;
 217   PyObject *rc = 0;
 218
 219   if (febinop(x, y, &ff, &fobj, &xx, &yy)) RETURN_NOTIMPL;
 220   switch (op) {
 221     case Py_EQ: b = MP_EQ(xx, yy); break;
 222     case Py_NE: b = !MP_EQ(xx, yy); break;
 223     default: TYERR("field elements are unordered");
 224   }
 225   rc = getbool(b);
 226 end:
 227   MP_DROP(xx); MP_DROP(yy);
 228   return (rc);
 229 }
 230
 231 static long fe_pyhash(PyObject *me)
 232 {
 233   long i = mp_tolong(FE_X(me));
 234   i ^= 0xdcf62d6c; /* random perturbance */
 235   if (i == -1)
 236     i = -2;
 237   return (i);
 238 }
 239
 240 static int fe_pycoerce(PyObject **x, PyObject **y)
 241 {
 242   mp *z;
 243
 244   if (FE_PYCHECK(*y)) {
 245     if (FE_F(*x) != FE_F(*y) && !field_samep(FE_F(*x), FE_F(*y)))
 246       TYERR("field mismatch");
 247     Py_INCREF(*x); Py_INCREF(*y);
 248     return (0);
 249   }
 250   if ((z = tofe(FE_F(*x), *y)) != 0) {
 251     Py_INCREF(*x);
 252     *y = fe_pywrap(FE_FOBJ(*x), z);
 253     return (0);
 254   }
 255   return (1);
 256
 257 end:
 258   return (-1);
 259 }
 260
 261 static PyObject *fe_pyint(PyObject *x)
 262 {
 263   long l;
 264   mp *xx = F_OUT(FE_F(x), MP_NEW, FE_X(x));
 265   if (mp_tolong_checked(xx, &l)) { MP_DROP(xx); return (0); }
 266   MP_DROP(xx);
 267   return (PyInt_FromLong(l));
 268 }
 269
 270 static PyObject *fe_pylong(PyObject *x)
 271 {
 272   mp *xx = F_OUT(FE_F(x), MP_NEW, FE_X(x));
 273   PyObject *rc = mp_topylong(xx);
 274   MP_DROP(xx);
 275   return (rc);
 276 }
 277
 278 #define BASEOP(name, radix, pre)                                        \
 279   static PyObject *fe_py##name(PyObject *x) {                           \
 280     mp *xx = F_OUT(FE_F(x), MP_NEW, FE_X(x));                           \
 281     PyObject *rc = mp_topystring(FE_X(x), radix, 0, pre, 0);            \
 282     MP_DROP(xx);                                                        \
 283     return (rc);                                                        \
 284   }
 285 BASEOP(oct, 8, "0");
 286 BASEOP(hex, 16, "0x");
 287 #undef BASEOP
 288
 289 static void fe_pydealloc(PyObject *me)
 290 {
 291   Py_DECREF(FE_FOBJ(me));
 292   MP_DROP(FE_X(me));
 293   FREEOBJ(me);
 294 }
 295
 296 #define UNOP(name, check)                                               \
 297   static PyObject *femeth_##name(PyObject *me, PyObject *arg) {         \
 298     field *f = FE_F(me);                                                \
 299     mp *x = FE_X(me);                                                   \
 300     if (!PyArg_ParseTuple(arg, ":" #name)) return (0);                  \
 301     if (!f->ops->name) TYERR(#name " not supported for this field");    \
 302     check                                                               \
 303     x = f->ops->name(f, MP_NEW, x);                                     \
 304     if (!x) RETURN_NONE;                                                \
 305     return (fe_pywrap(FE_FOBJ(me), x));                                 \
 306   end:                                                                  \
 307     return (0);                                                         \
 308   }
 309 UNOP(inv, if (F_ZEROP(f, x)) ZDIVERR("division by zero"); )
 310 UNOP(sqr, ; )
 311 UNOP(sqrt, ; )
 312 UNOP(quadsolve, ; )
 313 UNOP(dbl, ; )
 314 UNOP(tpl, ; )
 315 UNOP(qdl, ; )
 316 UNOP(hlv, ; )
 317 #undef UNOP
 318
 319 static PyObject *feget_field(PyObject *me, void *hunoz)
 320   { RETURN_OBJ(FE_FOBJ(me)); }
 321
 322 static PyObject *feget_value(PyObject *me, void *hunoz)
 323 {
 324   mp *x = F_OUT(FE_F(me), MP_NEW, FE_X(me));
 325   if (F_TYPE(FE_F(me)) == FTY_BINARY)
 326     return (gf_pywrap(x));
 327   else
 328     return (mp_pywrap(x));
 329 }
 330
 331 static PyObject *feget__value(PyObject *me, void *hunoz)
 332 {
 333   mp *x = FE_X(me);
 334   MP_COPY(x);
 335   if (F_TYPE(FE_F(me)) == FTY_BINARY)
 336     return (gf_pywrap(x));
 337   else
 338     return (mp_pywrap(x));
 339 }
 340
 341 static PyGetSetDef fe_pygetset[] = {
 342 #define GETSETNAME(op, name) fe##op##_##name
 343   GET   (field,         "X.field -> field containing X")
 344   GET   (value,         "X.value -> `natural' integer representation of X")
 345   GET   (_value,        "X._value -> internal integer representation of X")
 346 #undef GETSETNAME
 347   { 0 }
 348 };
 349
 350 static PyMethodDef fe_pymethods[] = {
 351 #define METHNAME(func) femeth_##func
 352   METH  (inv,           "X.inv() -> X^{-1}")
 353   METH  (sqr,           "X.sqr() -> X^2")
 354   METH  (sqrt,          "X.sqrt() -> sqrt(X)")
 355   METH  (quadsolve,     "X.quadsolve() -> Y where Y^2 + Y = X (binary only)")
 356   METH  (dbl,           "X.dbl() -> 2 * X (prime only)")
 357   METH  (tpl,           "X.tpl() -> 3 * X (prime only)")
 358   METH  (qdl,           "X.qdl() -> 4 * X (prime only)")
 359   METH  (hlv,           "X.hlv() -> X/2 (prime only)")
 360 #undef METHNAME
 361   { 0 }
 362 };
 363
 364 static PyNumberMethods fe_pynumber = {
 365   fe_pyadd,                             /* @nb_add@ */
 366   fe_pysub,                             /* @nb_subtract@ */
 367   fe_pymul,                             /* @nb_multiply@ */
 368   fe_pydiv,                             /* @nb_divide@ */
 369   0,                                    /* @nb_remainder@ */
 370   0,                                    /* @nb_divmod@ */
 371   fe_pyexp,                             /* @nb_power@ */
 372   fe_pyneg,                             /* @nb_negative@ */
 373   fe_pyid,                              /* @nb_positive@ */
 374   0,                                    /* @nb_absolute@ */
 375   fe_pynonzerop,                        /* @nb_nonzero@ */
 376   0,                                    /* @nb_invert@ */
 377   0,                                    /* @nb_lshift@ */
 378   0,                                    /* @nb_rshift@ */
 379   0,                                    /* @nb_and@ */
 380   0,                                    /* @nb_xor@ */
 381   0,                                    /* @nb_or@ */
 382   fe_pycoerce,                          /* @nb_coerce@ */
 383   fe_pyint,                             /* @nb_int@ */
 384   fe_pylong,                            /* @nb_long@ */
 385   0 /* meaningless */,                  /* @nb_float@ */
 386   fe_pyoct,                             /* @nb_oct@ */
 387   fe_pyhex,                             /* @nb_hex@ */
 388
 389   0,                                    /* @nb_inplace_add@ */
 390   0,                                    /* @nb_inplace_subtract@ */
 391   0,                                    /* @nb_inplace_multiply@ */
 392   0,                                    /* @nb_inplace_divide@ */
 393   0,                                    /* @nb_inplace_remainder@ */
 394   0,                                    /* @nb_inplace_power@ */
 395   0,                                    /* @nb_inplace_lshift@ */
 396   0,                                    /* @nb_inplace_rshift@ */
 397   0,                                    /* @nb_inplace_and@ */
 398   0,                                    /* @nb_inplace_xor@ */
 399   0,                                    /* @nb_inplace_or@ */
 400
 401   0,                                    /* @nb_floor_divide@ */
 402   fe_pydiv,                             /* @nb_true_divide@ */
 403   0,                                    /* @nb_inplace_floor_divide@ */
 404   0,                                    /* @nb_inplace_true_divide@ */
 405 };
 406
 407 static PyTypeObject fe_pytype_skel = {
 408   PyObject_HEAD_INIT(0) 0,              /* Header */
 409   "FE",                                 /* @tp_name@ */
 410   sizeof(fe_pyobj),                     /* @tp_basicsize@ */
 411   0,                                    /* @tp_itemsize@ */
 412
 413   fe_pydealloc,                         /* @tp_dealloc@ */
 414   0,                                    /* @tp_print@ */
 415   0,                                    /* @tp_getattr@ */
 416   0,                                    /* @tp_setattr@ */
 417   0,                                    /* @tp_compare@ */
 418   0,                                    /* @tp_repr@ */
 419   &fe_pynumber,                         /* @tp_as_number@ */
 420   0,                                    /* @tp_as_sequence@ */
 421   0,                                    /* @tp_as_mapping@ */
 422   fe_pyhash,                            /* @tp_hash@ */
 423   0,                                    /* @tp_call@ */
 424   fe_pyhex,                             /* @tp_str@ */
 425   0,                                    /* @tp_getattro@ */
 426   0,                                    /* @tp_setattro@ */
 427   0,                                    /* @tp_as_buffer@ */
 428   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 429     Py_TPFLAGS_CHECKTYPES |
 430     Py_TPFLAGS_BASETYPE,
 431
 432   /* @tp_doc@ */
 433 "Finite field elements, abstract base class.",
 434
 435   0,                                    /* @tp_traverse@ */
 436   0,                                    /* @tp_clear@ */
 437   fe_pyrichcompare,                     /* @tp_richcompare@ */
 438   0,                                    /* @tp_weaklistoffset@ */
 439   0,                                    /* @tp_iter@ */
 440   0,                                    /* @tp_iternext@ */
 441   fe_pymethods,                         /* @tp_methods@ */
 442   0,                                    /* @tp_members@ */
 443   fe_pygetset,                          /* @tp_getset@ */
 444   0,                                    /* @tp_base@ */
 445   0,                                    /* @tp_dict@ */
 446   0,                                    /* @tp_descr_get@ */
 447   0,                                    /* @tp_descr_set@ */
 448   0,                                    /* @tp_dictoffset@ */
 449   0,                                    /* @tp_init@ */
 450   PyType_GenericAlloc,                  /* @tp_alloc@ */
 451   abstract_pynew,                       /* @tp_new@ */
 452   0,                                    /* @tp_free@ */
 453   0                                     /* @tp_is_gc@ */
 454 };
 455
 456 /*----- Fields ------------------------------------------------------------*/
 457
 458 static PyObject *field_pyrichcompare(PyObject *x, PyObject *y, int op)
 459 {
 460   int b = field_samep(FIELD_F(x), FIELD_F(y));
 461   switch (op) {
 462     case Py_EQ: break;
 463     case Py_NE: b = !b;
 464     default: TYERR("can't order fields");
 465   }
 466   return (getbool(b));
 467 end:
 468   return (0);
 469 }
 470
 471 static PyObject *fmeth_rand(PyObject *me, PyObject *arg, PyObject *kw)
 472 {
 473   char *kwlist[] = { "rng", 0 };
 474   grand *r = &rand_global;
 475
 476   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:rand", kwlist,
 477                                    convgrand, &r))
 478     return (0);
 479   return (fe_pywrap(me, F_RAND(FIELD_F(me), MP_NEW, r)));
 480 }
 481
 482 static PyObject *fmeth__adopt(PyObject *me, PyObject *arg)
 483 {
 484   mp *xx;
 485   if (!PyArg_ParseTuple(arg, "O&:_adopt", convmp, &xx)) return (0);
 486   return (fe_pywrap(me, xx));
 487 }
 488
 489 static void field_pydealloc(PyObject *me)
 490 {
 491   F_DESTROY(FIELD_F(me));
 492   PyType_Type.tp_dealloc(me);
 493 }
 494
 495 static PyObject *fget_zero(PyObject *me, void *hunoz)
 496   { return (fe_pywrap(me, MP_COPY(FIELD_F(me)->zero))); }
 497
 498 static PyObject *fget_one(PyObject *me, void *hunoz)
 499   { return (fe_pywrap(me, MP_COPY(FIELD_F(me)->one))); }
 500
 501 static PyObject *fget_q(PyObject *me, void *hunoz)
 502   { return (mp_pywrap(MP_COPY(FIELD_F(me)->q))); }
 503
 504 static PyObject *fget_nbits(PyObject *me, void *hunoz)
 505   { return (PyInt_FromLong(FIELD_F(me)->nbits)); }
 506
 507 static PyObject *fget_noctets(PyObject *me, void *hunoz)
 508   { return (PyInt_FromLong(FIELD_F(me)->noctets)); }
 509
 510 static PyObject *fget_name(PyObject *me, void *hunoz)
 511   { return (PyString_FromString(F_NAME(FIELD_F(me)))); }
 512
 513 static PyObject *fget_type(PyObject *me, void *hunoz)
 514   { return (PyInt_FromLong(F_TYPE(FIELD_F(me)))); }
 515
 516 static PyGetSetDef field_pygetset[] = {
 517 #define GETSETNAME(op, name) f##op##_##name
 518   GET   (zero,          "F.zero -> field additive identity")
 519   GET   (one,           "F.one -> field multiplicative identity")
 520   GET   (q,             "F.q -> number of elements in field")
 521   GET   (nbits,         "F.nbits -> bits needed to represent element")
 522   GET   (noctets,       "F.noctets -> octetss needed to represent element")
 523   GET   (name,          "F.name -> name of this kind of field")
 524   GET   (type,          "F.type -> type code of this kind of field")
 525 #undef GETSETNAME
 526   { 0 }
 527 };
 528
 529 static PyMethodDef field_pymethods[] = {
 530 #define METHNAME(name) fmeth_##name
 531   METH  (_adopt,        "F._adopt(X) -> FE")
 532   KWMETH(rand,          "F.rand(rng = rand) -> FE, uniformly distributed")
 533 #undef METHNAME
 534   { 0 }
 535 };
 536
 537 static PyTypeObject field_pytype_skel = {
 538   PyObject_HEAD_INIT(0) 0,              /* Header */
 539   "Field",                              /* @tp_name@ */
 540   sizeof(field_pyobj),                  /* @tp_basicsize@ */
 541   0,                                    /* @tp_itemsize@ */
 542
 543   field_pydealloc,                      /* @tp_dealloc@ */
 544   0,                                    /* @tp_print@ */
 545   0,                                    /* @tp_getattr@ */
 546   0,                                    /* @tp_setattr@ */
 547   0,                                    /* @tp_compare@ */
 548   0,                                    /* @tp_repr@ */
 549   0,                                    /* @tp_as_number@ */
 550   0,                                    /* @tp_as_sequence@ */
 551   0,                                    /* @tp_as_mapping@ */
 552   0,                                    /* @tp_hash@ */
 553   0,                                    /* @tp_call@ */
 554   0,                                    /* @tp_str@ */
 555   0,                                    /* @tp_getattro@ */
 556   0,                                    /* @tp_setattro@ */
 557   0,                                    /* @tp_as_buffer@ */
 558   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 559     Py_TPFLAGS_BASETYPE,
 560
 561   /* @tp_doc@ */
 562 "An abstract field.  This is an abstract type.",
 563
 564   0,                                    /* @tp_traverse@ */
 565   0,                                    /* @tp_clear@ */
 566   field_pyrichcompare,                  /* @tp_richcompare@ */
 567   0,                                    /* @tp_weaklistoffset@ */
 568   0,                                    /* @tp_iter@ */
 569   0,                                    /* @tp_iternext@ */
 570   field_pymethods,                      /* @tp_methods@ */
 571   0,                                    /* @tp_members@ */
 572   field_pygetset,                       /* @tp_getset@ */
 573   0,                                    /* @tp_base@ */
 574   0,                                    /* @tp_dict@ */
 575   0,                                    /* @tp_descr_get@ */
 576   0,                                    /* @tp_descr_set@ */
 577   0,                                    /* @tp_dictoffset@ */
 578   0,                                    /* @tp_init@ */
 579   PyType_GenericAlloc,                  /* @tp_alloc@ */
 580   abstract_pynew,                       /* @tp_new@ */
 581   0,                                    /* @tp_free@ */
 582   0                                     /* @tp_is_gc@ */
 583 };
 584
 585 /*----- Prime fields ------------------------------------------------------*/
 586
 587 static PyObject *primefield_pynew(PyTypeObject *ty,
 588                                   PyObject *arg, PyObject *kw)
 589 {
 590   mp *xx = 0;
 591   field *f;
 592   char *kwlist[] = { "p", 0 };
 593
 594   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&:primefield", kwlist,
 595                                    convmp, &xx))
 596     goto end;
 597   if ((f = field_prime(xx)) == 0)
 598     VALERR("bad prime for primefield");
 599   MP_DROP(xx);
 600   return (field_dopywrap(ty, f));
 601 end:
 602   mp_drop(xx);
 603   return (0);
 604 }
 605
 606 static PyObject *pfget_p(PyObject *me, void *hunoz)
 607   { return (mp_pywrap(MP_COPY(FIELD_F(me)->m))); }
 608
 609 static PyGetSetDef primefield_pygetset[] = {
 610 #define GETSETNAME(op, name) pf##op##_##name
 611   GET   (p,             "F.p -> prime field characteristic")
 612 #undef GETSETNAME
 613 };
 614
 615 static PyTypeObject primefield_pytype_skel = {
 616   PyObject_HEAD_INIT(0) 0,              /* Header */
 617   "PrimeField",                         /* @tp_name@ */
 618   sizeof(field_pyobj),                  /* @tp_basicsize@ */
 619   0,                                    /* @tp_itemsize@ */
 620
 621   field_pydealloc,                      /* @tp_dealloc@ */
 622   0,                                    /* @tp_print@ */
 623   0,                                    /* @tp_getattr@ */
 624   0,                                    /* @tp_setattr@ */
 625   0,                                    /* @tp_compare@ */
 626   0,                                    /* @tp_repr@ */
 627   0,                                    /* @tp_as_number@ */
 628   0,                                    /* @tp_as_sequence@ */
 629   0,                                    /* @tp_as_mapping@ */
 630   0,                                    /* @tp_hash@ */
 631   0,                                    /* @tp_call@ */
 632   0,                                    /* @tp_str@ */
 633   0,                                    /* @tp_getattro@ */
 634   0,                                    /* @tp_setattro@ */
 635   0,                                    /* @tp_as_buffer@ */
 636   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 637     Py_TPFLAGS_BASETYPE,
 638
 639   /* @tp_doc@ */
 640   "Prime fields.",
 641
 642   0,                                    /* @tp_traverse@ */
 643   0,                                    /* @tp_clear@ */
 644   field_pyrichcompare,                  /* @tp_richcompare@ */
 645   0,                                    /* @tp_weaklistoffset@ */
 646   0,                                    /* @tp_iter@ */
 647   0,                                    /* @tp_iternext@ */
 648   0,                                    /* @tp_methods@ */
 649   0,                                    /* @tp_members@ */
 650   primefield_pygetset,                  /* @tp_getset@ */
 651   0,                                    /* @tp_base@ */
 652   0,                                    /* @tp_dict@ */
 653   0,                                    /* @tp_descr_get@ */
 654   0,                                    /* @tp_descr_set@ */
 655   0,                                    /* @tp_dictoffset@ */
 656   0,                                    /* @tp_init@ */
 657   PyType_GenericAlloc,                  /* @tp_alloc@ */
 658   primefield_pynew,                     /* @tp_new@ */
 659   0,                                    /* @tp_free@ */
 660   0                                     /* @tp_is_gc@ */
 661 };
 662
 663 static PyObject *niceprimefield_pynew(PyTypeObject *ty,
 664                                       PyObject *arg, PyObject *kw)
 665 {
 666   mp *xx = 0;
 667   field *f;
 668   char *kwlist[] = { "p", 0 };
 669
 670   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&:niceprimefield",
 671                                    kwlist, convmp, &xx))
 672     goto end;
 673   if ((f = field_niceprime(xx)) == 0)
 674     VALERR("bad prime for niceprimefield");
 675   MP_DROP(xx);
 676   return (field_dopywrap(ty, f));
 677 end:
 678   mp_drop(xx);
 679   return (0);
 680 }
 681
 682 static PyTypeObject niceprimefield_pytype_skel = {
 683   PyObject_HEAD_INIT(0) 0,              /* Header */
 684   "NicePrimeField",                     /* @tp_name@ */
 685   sizeof(field_pyobj),                  /* @tp_basicsize@ */
 686   0,                                    /* @tp_itemsize@ */
 687
 688   field_pydealloc,                      /* @tp_dealloc@ */
 689   0,                                    /* @tp_print@ */
 690   0,                                    /* @tp_getattr@ */
 691   0,                                    /* @tp_setattr@ */
 692   0,                                    /* @tp_compare@ */
 693   0,                                    /* @tp_repr@ */
 694   0,                                    /* @tp_as_number@ */
 695   0,                                    /* @tp_as_sequence@ */
 696   0,                                    /* @tp_as_mapping@ */
 697   0,                                    /* @tp_hash@ */
 698   0,                                    /* @tp_call@ */
 699   0,                                    /* @tp_str@ */
 700   0,                                    /* @tp_getattro@ */
 701   0,                                    /* @tp_setattro@ */
 702   0,                                    /* @tp_as_buffer@ */
 703   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 704     Py_TPFLAGS_BASETYPE,
 705
 706   /* @tp_doc@ */
 707   "Nice prime fields.",
 708
 709   0,                                    /* @tp_traverse@ */
 710   0,                                    /* @tp_clear@ */
 711   field_pyrichcompare,                  /* @tp_richcompare@ */
 712   0,                                    /* @tp_weaklistoffset@ */
 713   0,                                    /* @tp_iter@ */
 714   0,                                    /* @tp_iternext@ */
 715   0,                                    /* @tp_methods@ */
 716   0,                                    /* @tp_members@ */
 717   0,                                    /* @tp_getset@ */
 718   0,                                    /* @tp_base@ */
 719   0,                                    /* @tp_dict@ */
 720   0,                                    /* @tp_descr_get@ */
 721   0,                                    /* @tp_descr_set@ */
 722   0,                                    /* @tp_dictoffset@ */
 723   0,                                    /* @tp_init@ */
 724   PyType_GenericAlloc,                  /* @tp_alloc@ */
 725   niceprimefield_pynew,                 /* @tp_new@ */
 726   0,                                    /* @tp_free@ */
 727   0                                     /* @tp_is_gc@ */
 728 };
 729
 730 /*----- Binary fields -----------------------------------------------------*/
 731
 732 static PyObject *bfget_m(PyObject *me, void *hunoz)
 733   { return (PyInt_FromLong(FIELD_F(me)->nbits)); }
 734
 735 static PyGetSetDef binfield_pygetset[] = {
 736 #define GETSETNAME(op, name) bf##op##_##name
 737   GET   (m,             "F.m -> field polynomial degree")
 738 #undef GETSETNAME
 739   { 0 }
 740 };
 741
 742 static PyTypeObject binfield_pytype_skel = {
 743   PyObject_HEAD_INIT(0) 0,              /* Header */
 744   "BinField",                           /* @tp_name@ */
 745   sizeof(field_pyobj),                  /* @tp_basicsize@ */
 746   0,                                    /* @tp_itemsize@ */
 747
 748   field_pydealloc,                      /* @tp_dealloc@ */
 749   0,                                    /* @tp_print@ */
 750   0,                                    /* @tp_getattr@ */
 751   0,                                    /* @tp_setattr@ */
 752   0,                                    /* @tp_compare@ */
 753   0,                                    /* @tp_repr@ */
 754   0,                                    /* @tp_as_number@ */
 755   0,                                    /* @tp_as_sequence@ */
 756   0,                                    /* @tp_as_mapping@ */
 757   0,                                    /* @tp_hash@ */
 758   0,                                    /* @tp_call@ */
 759   0,                                    /* @tp_str@ */
 760   0,                                    /* @tp_getattro@ */
 761   0,                                    /* @tp_setattro@ */
 762   0,                                    /* @tp_as_buffer@ */
 763   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 764     Py_TPFLAGS_BASETYPE,
 765
 766   /* @tp_doc@ */
 767   "Binary fields.  Abstract class.",
 768
 769   0,                                    /* @tp_traverse@ */
 770   0,                                    /* @tp_clear@ */
 771   field_pyrichcompare,                  /* @tp_richcompare@ */
 772   0,                                    /* @tp_weaklistoffset@ */
 773   0,                                    /* @tp_iter@ */
 774   0,                                    /* @tp_iternext@ */
 775   0,                                    /* @tp_methods@ */
 776   0,                                    /* @tp_members@ */
 777   binfield_pygetset,                    /* @tp_getset@ */
 778   0,                                    /* @tp_base@ */
 779   0,                                    /* @tp_dict@ */
 780   0,                                    /* @tp_descr_get@ */
 781   0,                                    /* @tp_descr_set@ */
 782   0,                                    /* @tp_dictoffset@ */
 783   0,                                    /* @tp_init@ */
 784   PyType_GenericAlloc,                  /* @tp_alloc@ */
 785   abstract_pynew,                       /* @tp_new@ */
 786   0,                                    /* @tp_free@ */
 787   0                                     /* @tp_is_gc@ */
 788 };
 789
 790 static PyObject *binpolyfield_pynew(PyTypeObject *ty,
 791                                     PyObject *arg, PyObject *kw)
 792 {
 793   mp *xx = 0;
 794   field *f;
 795   char *kwlist[] = { "p", 0 };
 796
 797   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&:binpolyfield", kwlist,
 798                                    convgf, &xx))
 799     goto end;
 800   if ((f = field_binpoly(xx)) == 0) VALERR("bad poly for binpolyfield");
 801   MP_DROP(xx);
 802   return (field_dopywrap(ty, f));
 803 end:
 804   mp_drop(xx);
 805   return (0);
 806 }
 807
 808 static PyGetSetDef binpolyfield_pygetset[] = {
 809 #define GETSETNAME(op, name) pf##op##_##name
 810   GET   (p,             "F.p -> field polynomial")
 811 #undef GETSETNAME
 812   { 0 }
 813 };
 814
 815 static PyTypeObject binpolyfield_pytype_skel = {
 816   PyObject_HEAD_INIT(0) 0,              /* Header */
 817   "BinPolyField",                       /* @tp_name@ */
 818   sizeof(field_pyobj),                  /* @tp_basicsize@ */
 819   0,                                    /* @tp_itemsize@ */
 820
 821   field_pydealloc,                      /* @tp_dealloc@ */
 822   0,                                    /* @tp_print@ */
 823   0,                                    /* @tp_getattr@ */
 824   0,                                    /* @tp_setattr@ */
 825   0,                                    /* @tp_compare@ */
 826   0,                                    /* @tp_repr@ */
 827   0,                                    /* @tp_as_number@ */
 828   0,                                    /* @tp_as_sequence@ */
 829   0,                                    /* @tp_as_mapping@ */
 830   0,                                    /* @tp_hash@ */
 831   0,                                    /* @tp_call@ */
 832   0,                                    /* @tp_str@ */
 833   0,                                    /* @tp_getattro@ */
 834   0,                                    /* @tp_setattro@ */
 835   0,                                    /* @tp_as_buffer@ */
 836   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 837     Py_TPFLAGS_BASETYPE,
 838
 839   /* @tp_doc@ */
 840   "Binary fields with polynomial basis representation.",
 841
 842   0,                                    /* @tp_traverse@ */
 843   0,                                    /* @tp_clear@ */
 844   field_pyrichcompare,                  /* @tp_richcompare@ */
 845   0,                                    /* @tp_weaklistoffset@ */
 846   0,                                    /* @tp_iter@ */
 847   0,                                    /* @tp_iternext@ */
 848   0,                                    /* @tp_methods@ */
 849   0,                                    /* @tp_members@ */
 850   binpolyfield_pygetset,                /* @tp_getset@ */
 851   0,                                    /* @tp_base@ */
 852   0,                                    /* @tp_dict@ */
 853   0,                                    /* @tp_descr_get@ */
 854   0,                                    /* @tp_descr_set@ */
 855   0,                                    /* @tp_dictoffset@ */
 856   0,                                    /* @tp_init@ */
 857   PyType_GenericAlloc,                  /* @tp_alloc@ */
 858   binpolyfield_pynew,                   /* @tp_new@ */
 859   0,                                    /* @tp_free@ */
 860   0                                     /* @tp_is_gc@ */
 861 };
 862
 863 static PyObject *binnormfield_pynew(PyTypeObject *ty,
 864                                     PyObject *arg, PyObject *kw)
 865 {
 866   mp *xx = 0, *yy = 0;
 867   field *f;
 868   char *kwlist[] = { "p", "beta", 0 };
 869
 870   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&O&:binnormfield",
 871                                    kwlist, convgf, &xx, convgf, &yy))
 872     goto end;
 873   if ((f = field_binnorm(xx, yy)) == 0) VALERR("bad args for binnormfield");
 874   MP_DROP(xx); MP_DROP(yy);
 875   return (field_dopywrap(ty, f));
 876 end:
 877   mp_drop(xx); mp_drop(yy);
 878   return (0);
 879 }
 880
 881 static PyObject *bnfget_beta(PyObject *me, void *hunoz)
 882 {
 883   fctx_binnorm *fc = (fctx_binnorm *)FIELD_F(me);
 884   return (gf_pywrap(MP_COPY(fc->ntop.r[fc->ntop.n - 1])));
 885 }
 886
 887 static PyGetSetDef binnormfield_pygetset[] = {
 888 #define GETSETNAME(op, name) pf##op##_##name
 889   GET   (p,             "F.p -> field polynomial")
 890 #undef GETSETNAME
 891 #define GETSETNAME(op, name) bnf##op##_##name
 892   GET   (beta,          "F.beta -> conversion factor")
 893 #undef GETSETNAME
 894   { 0 }
 895 };
 896
 897 static PyTypeObject binnormfield_pytype_skel = {
 898   PyObject_HEAD_INIT(0) 0,              /* Header */
 899   "BinNormField",                       /* @tp_name@ */
 900   sizeof(field_pyobj),                  /* @tp_basicsize@ */
 901   0,                                    /* @tp_itemsize@ */
 902
 903   field_pydealloc,                      /* @tp_dealloc@ */
 904   0,                                    /* @tp_print@ */
 905   0,                                    /* @tp_getattr@ */
 906   0,                                    /* @tp_setattr@ */
 907   0,                                    /* @tp_compare@ */
 908   0,                                    /* @tp_repr@ */
 909   0,                                    /* @tp_as_number@ */
 910   0,                                    /* @tp_as_sequence@ */
 911   0,                                    /* @tp_as_mapping@ */
 912   0,                                    /* @tp_hash@ */
 913   0,                                    /* @tp_call@ */
 914   0,                                    /* @tp_str@ */
 915   0,                                    /* @tp_getattro@ */
 916   0,                                    /* @tp_setattro@ */
 917   0,                                    /* @tp_as_buffer@ */
 918   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 919     Py_TPFLAGS_BASETYPE,
 920
 921   /* @tp_doc@ */
 922   "Binary fields with normal basis representation.",
 923
 924   0,                                    /* @tp_traverse@ */
 925   0,                                    /* @tp_clear@ */
 926   field_pyrichcompare,                  /* @tp_richcompare@ */
 927   0,                                    /* @tp_weaklistoffset@ */
 928   0,                                    /* @tp_iter@ */
 929   0,                                    /* @tp_iternext@ */
 930   0,                                    /* @tp_methods@ */
 931   0,                                    /* @tp_members@ */
 932   binnormfield_pygetset,                /* @tp_getset@ */
 933   0,                                    /* @tp_base@ */
 934   0,                                    /* @tp_dict@ */
 935   0,                                    /* @tp_descr_get@ */
 936   0,                                    /* @tp_descr_set@ */
 937   0,                                    /* @tp_dictoffset@ */
 938   0,                                    /* @tp_init@ */
 939   PyType_GenericAlloc,                  /* @tp_alloc@ */
 940   binnormfield_pynew,                   /* @tp_new@ */
 941   0,                                    /* @tp_free@ */
 942   0                                     /* @tp_is_gc@ */
 943 };
 944
 945 /*----- Setup -------------------------------------------------------------*/
 946
 947 static PyObject *meth__Field_parse(PyObject *me, PyObject *arg)
 948 {
 949   field *f;
 950   char *p;
 951   PyObject *rc = 0;
 952   qd_parse qd;
 953
 954   if (!PyArg_ParseTuple(arg, "Os:parse", &me, &p))
 955     goto end;
 956   qd.p = p;
 957   qd.e = 0;
 958   if ((f = field_parse(&qd)) == 0)
 959     SYNERR(qd.e);
 960   rc = Py_BuildValue("(Ns)", field_pywrap(f), qd.p);
 961 end:
 962   return (rc);
 963 }
 964
 965 static PyMethodDef methods[] = {
 966 #define METHNAME(func) meth_##func
 967   METH  (_Field_parse,          "parse(STR) -> F, REST")
 968 #undef METHNAME
 969   { 0 }
 970 };
 971
 972 void field_pyinit(void)
 973 {
 974   INITTYPE(fe, root);
 975   INITTYPE(field, type);
 976   INITTYPE(primefield, field);
 977   INITTYPE(niceprimefield, primefield);
 978   INITTYPE(binfield, field);
 979   INITTYPE(binpolyfield, binfield);
 980   INITTYPE(binnormfield, binfield);
 981   addmethods(methods);
 982 }
 983
 984 void field_pyinsert(PyObject *mod)
 985 {
 986   INSERT("FE", fe_pytype);
 987   INSERT("Field", field_pytype);
 988   INSERT("PrimeField", primefield_pytype);
 989   INSERT("NicePrimeField", niceprimefield_pytype);
 990   INSERT("BinField", binfield_pytype);
 991   INSERT("BinPolyField", binpolyfield_pytype);
 992   INSERT("BinNormField", binnormfield_pytype);
 993 }
 994
 995 /*----- That's all, folks -------------------------------------------------*/