mdw@git.distorted.org.uk Git - catacomb-python/blob - buffer.c

   1 /* -*-c-*-
   2  *
   3  * Reading and writing buffers of stuff
   4  *
   5  * (c) 2005 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 /*----- Data structures ---------------------------------------------------*/
  32
  33 typedef struct buf_pyobj {
  34   PyObject_HEAD
  35   buf b;
  36   PyObject *sub;
  37 } buf_pyobj;
  38
  39 static PyTypeObject *rbuf_pytype, *wbuf_pytype;
  40 #define RBUF_PYCHECK(o) PyObject_TypeCheck((o), rbuf_pytype)
  41 #define WBUF_PYCHECK(o) PyObject_TypeCheck((o), wbuf_pytype)
  42 #define BUF_B(o) (&((buf_pyobj *)(o))->b)
  43 #define BUF_SUB(o) (((buf_pyobj *)(o))->sub)
  44
  45 /*----- Exceptions --------------------------------------------------------*/
  46
  47 static PyObject *buferr;
  48
  49 #define BUFERR() do { PyErr_SetNone(buferr); goto end; } while (0)
  50
  51 /*----- Read buffers ------------------------------------------------------*/
  52
  53 static PyObject *rbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
  54 {
  55   char *p, *q;
  56   Py_ssize_t n;
  57   buf_pyobj *me = 0;
  58   static const char *const kwlist[] = { "data", 0 };
  59
  60   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &p, &n))
  61     goto end;
  62   q = xmalloc(n);
  63   memcpy(q, p, n);
  64   me = (buf_pyobj *)ty->tp_alloc(ty, 0);
  65   me->sub = 0;
  66   buf_init(&me->b, q, n);
  67 end:
  68   return ((PyObject *)me);
  69 }
  70
  71 static void buf_pydealloc(PyObject *me)
  72 {
  73   if (BUF_SUB(me))
  74     Py_DECREF(BUF_SUB(me));
  75   else
  76     xfree(BBASE(BUF_B(me)));
  77   FREEOBJ(me);
  78 }
  79
  80 static Py_ssize_t rbuf_pysegcount(PyObject *me, Py_ssize_t *nn)
  81   { if (nn) *nn = BSZ(BUF_B(me)); return (1); }
  82
  83 static Py_ssize_t rbuf_pyreadbuf(PyObject *me, Py_ssize_t seg, void **q)
  84   { assert(seg == 0); *q = BCUR(BUF_B(me)); return (BLEFT(BUF_B(me))); }
  85
  86 static PyObject *rbmeth_skip(PyObject *me, PyObject *arg)
  87 {
  88   size_t n;
  89
  90   if (!PyArg_ParseTuple(arg, "O&:skip", convszt, &n)) goto end;
  91   if (!buf_get(BUF_B(me), n)) BUFERR();
  92   RETURN_ME;
  93 end:
  94   return (0);
  95 }
  96
  97 static PyObject *rbmeth_get(PyObject *me, PyObject *arg)
  98 {
  99   void *p;
 100   size_t n;
 101
 102   if (!PyArg_ParseTuple(arg, "O&:get", convszt, &n)) goto end;
 103   if ((p = buf_get(BUF_B(me), n)) == 0) BUFERR();
 104   return (bytestring_pywrap(p, n));
 105 end:
 106   return (0);
 107 }
 108
 109 #define RBMETH_GETU_(n, W, w)                                           \
 110   static PyObject *rbmeth_getu##w(PyObject *me, PyObject *arg)          \
 111   {                                                                     \
 112     uint##n x;                                                          \
 113     if (!PyArg_ParseTuple(arg, ":getu" #w)) goto end;                   \
 114     if (buf_getu##w(BUF_B(me), &x)) BUFERR();                           \
 115     return (getulong(x));                                               \
 116   end:                                                                  \
 117     return (0);                                                         \
 118   }
 119 DOUINTCONV(RBMETH_GETU_)
 120
 121 #define RBMETH_GETBLK_(n, W, w)                                         \
 122   static PyObject *rbmeth_getblk##w(PyObject *me, PyObject *arg)        \
 123   {                                                                     \
 124     size_t sz;                                                          \
 125     char *q;                                                            \
 126     if (!PyArg_ParseTuple(arg, ":getblk" #w)) goto end;                 \
 127     if ((q = buf_getmem##w(BUF_B(me), &sz)) == 0) BUFERR();             \
 128     return (bytestring_pywrap(q, sz));                                  \
 129   end:                                                                  \
 130     return (0);                                                         \
 131   }
 132 BUF_DOSUFFIXES(RBMETH_GETBLK_)
 133
 134 #define RBMETH_GETBUF_(n, W, w)                                         \
 135   static PyObject *rbmeth_getbuf##w(PyObject *me, PyObject *arg)        \
 136   {                                                                     \
 137     buf_pyobj *b;                                                       \
 138     buf bb;                                                             \
 139     if (!PyArg_ParseTuple(arg, ":getbuf" #w)) goto end;                 \
 140     if (buf_getbuf##w(BUF_B(me), &bb)) BUFERR();                        \
 141     b = PyObject_NEW(buf_pyobj, rbuf_pytype);                           \
 142     b->b = bb;                                                          \
 143     b->sub = me;                                                        \
 144     Py_INCREF(me);                                                      \
 145     return ((PyObject *)b);                                             \
 146   end:                                                                  \
 147     return (0);                                                         \
 148   }
 149 BUF_DOSUFFIXES(RBMETH_GETBUF_)
 150
 151 static PyObject *rbmeth_getmp(PyObject *me, PyObject *arg)
 152 {
 153   mp *x;
 154   if (!PyArg_ParseTuple(arg, ":getmp")) goto end;
 155   if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR();
 156   return (mp_pywrap(x));
 157 end:
 158   return (0);
 159 }
 160
 161 static PyObject *rbmeth_getgf(PyObject *me, PyObject *arg)
 162 {
 163   mp *x;
 164   if (!PyArg_ParseTuple(arg, ":getgf")) goto end;
 165   if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR();
 166   return (gf_pywrap(x));
 167 end:
 168   return (0);
 169 }
 170
 171 static PyObject *rbmeth_getecpt(PyObject *me, PyObject *arg, PyObject *kw)
 172 {
 173   PyObject *cobj = Py_None;
 174   static const char *const kwlist[] = { "curve", 0 };
 175   ec pt = EC_INIT;
 176   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O:getecpt", KWLIST, &cobj))
 177     goto end;
 178   if (cobj == Py_None) cobj = (PyObject *)ecpt_pytype;
 179   if (!PyType_Check(cobj) ||
 180       !PyType_IsSubtype((PyTypeObject *)cobj, ecpt_pytype))
 181     TYERR("expected elliptic curve type");
 182   if (buf_getec(BUF_B(me), &pt)) BUFERR();
 183   return (ecpt_pywrapout(cobj, &pt));
 184 end:
 185   return (0);
 186 }
 187
 188 static PyObject *rbmeth_getecptraw(PyObject *me, PyObject *arg)
 189 {
 190   PyTypeObject *cobj = ecpt_pytype;
 191   ec pt = EC_INIT;
 192   if (!PyArg_ParseTuple(arg, "O!:getecptraw", eccurve_pytype, &cobj))
 193     goto end;
 194   if (ec_getraw(ECCURVE_C(cobj), BUF_B(me), &pt)) BUFERR();
 195   return (ecpt_pywrapout(cobj, &pt));
 196 end:
 197   return (0);
 198 }
 199
 200 static PyObject *rbmeth_getge(PyObject *me, PyObject *arg)
 201 {
 202   PyObject *gobj;
 203   ge *x = 0;
 204   if (!PyArg_ParseTuple(arg, "O!:getge", group_pytype, &gobj)) goto end;
 205   x = G_CREATE(GROUP_G(gobj));
 206   if (G_FROMBUF(GROUP_G(gobj), BUF_B(me), x)) BUFERR();
 207   return (ge_pywrap(gobj, x));
 208 end:
 209   if (x) G_DESTROY(GROUP_G(gobj), x);
 210   return (0);
 211 }
 212
 213 static PyObject *rbmeth_getgeraw(PyObject *me, PyObject *arg)
 214 {
 215   PyObject *gobj;
 216   ge *x = 0;
 217   if (!PyArg_ParseTuple(arg, "O!:getgeraw", group_pytype, &gobj)) goto end;
 218   x = G_CREATE(GROUP_G(gobj));
 219   if (G_FROMRAW(GROUP_G(gobj), BUF_B(me), x)) BUFERR();
 220   return (ge_pywrap(gobj, x));
 221 end:
 222   if (x) G_DESTROY(GROUP_G(gobj), x);
 223   return (0);
 224 }
 225
 226 static PyObject *rbget_size(PyObject *me, void *hunoz)
 227   { return (PyInt_FromLong(BSZ(BUF_B(me)))); }
 228 static PyObject *rbget_left(PyObject *me, void *hunoz)
 229   { return (PyInt_FromLong(BLEFT(BUF_B(me)))); }
 230 static PyObject *rbget_endp(PyObject *me, void *hunoz)
 231   { return (getbool(!BLEFT(BUF_B(me)))); }
 232 static PyObject *rbget_offset(PyObject *me, void *hunoz)
 233   { return (PyInt_FromLong(BLEN(BUF_B(me)))); }
 234 static int rbset_offset(PyObject *me, PyObject *x, void *hunoz)
 235 {
 236   size_t n;
 237   if (!x) NIERR("__del__");
 238   if (!convszt(x, &n)) goto end;
 239   if (n > BSZ(BUF_B(me))) VALERR("out of range");
 240   BCUR(BUF_B(me)) = BBASE(BUF_B(me)) + n;
 241   return (0);
 242 end:
 243   return (-1);
 244 }
 245
 246 static PyGetSetDef rbuf_pygetset[] = {
 247 #define GETSETNAME(op, name) rb##op##_##name
 248   GET   (size,                  "RBUF.size -> SIZE")
 249   GET   (left,                  "RBUF.left -> REMAINDER")
 250   GET   (endp,                  "RBUF.endp -> BOOL")
 251   GETSET(offset,                "RBUF.offset -> OFFSET")
 252 #undef GETSETNAME
 253   { 0 }
 254 };
 255
 256 static PyMethodDef rbuf_pymethods[] = {
 257 #define METHNAME(func) rbmeth_##func
 258   METH  (skip,                  "RBUF.skip(N)")
 259   METH  (get,                   "RBUF.get(N) -> BYTES")
 260 #define RBMETH_DECL_GETU_(n, W, w)                                      \
 261     METH(getu##w, "RBUF.getu" #w "() -> INT")
 262   DOUINTCONV(RBMETH_DECL_GETU_)
 263 #define RBMETH_DECL_GETBLK_(n, W, w)                                    \
 264     METH(getblk##w, "RBUF.getblk" #w "() -> INT")
 265   BUF_DOSUFFIXES(RBMETH_DECL_GETBLK_)
 266 #define RBMETH_DECL_GETBUF_(n, W, w)                                    \
 267     METH(getbuf##w, "RBUF.getbuf" #w "() -> INT")
 268   BUF_DOSUFFIXES(RBMETH_DECL_GETBUF_)
 269   METH  (getmp,                 "RBUF.getmp() -> X")
 270   METH  (getgf,                 "RBUF.getgf() -> X")
 271   KWMETH(getecpt,               "RBUF.getecpt(curve = None) -> P")
 272   METH  (getecptraw,            "RBUF.getecptraw(CURVE) -> P")
 273   METH  (getge,                 "RBUF.getge(GROUP) -> X")
 274   METH  (getgeraw,              "RBUF.getgeraw(GROUP) -> X")
 275 #undef METHNAME
 276   { 0 }
 277 };
 278
 279 static PyBufferProcs rbuf_pybuffer = {
 280   rbuf_pyreadbuf,                       /* @bf_getreadbuffer@ */
 281   0,                                    /* @bf_getwritebuffer@ */
 282   rbuf_pysegcount,                      /* @bf_getsegcount@ */
 283   0                                     /* @bf_getcharbuffer@ */
 284 };
 285
 286 static PyTypeObject rbuf_pytype_skel = {
 287   PyObject_HEAD_INIT(0) 0,              /* Header */
 288   "ReadBuffer",                         /* @tp_name@ */
 289   sizeof(buf_pyobj),                    /* @tp_basicsize@ */
 290   0,                                    /* @tp_itemsize@ */
 291
 292   buf_pydealloc,                        /* @tp_dealloc@ */
 293   0,                                    /* @tp_print@ */
 294   0,                                    /* @tp_getattr@ */
 295   0,                                    /* @tp_setattr@ */
 296   0,                                    /* @tp_compare@ */
 297   0,                                    /* @tp_repr@ */
 298   0,                                    /* @tp_as_number@ */
 299   0,                                    /* @tp_as_sequence@ */
 300   0,                                    /* @tp_as_mapping@ */
 301   0,                                    /* @tp_hash@ */
 302   0,                                    /* @tp_call@ */
 303   0,                                    /* @tp_str@ */
 304   0,                                    /* @tp_getattro@ */
 305   0,                                    /* @tp_setattro@ */
 306   &rbuf_pybuffer,                       /* @tp_as_buffer@ */
 307   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 308     Py_TPFLAGS_BASETYPE,
 309
 310   /* @tp_doc@ */
 311 "ReadBuffer(STR): a read buffer.",
 312
 313   0,                                    /* @tp_traverse@ */
 314   0,                                    /* @tp_clear@ */
 315   0,                                    /* @tp_richcompare@ */
 316   0,                                    /* @tp_weaklistoffset@ */
 317   0,                                    /* @tp_iter@ */
 318   0,                                    /* @tp_iternext@ */
 319   rbuf_pymethods,                       /* @tp_methods@ */
 320   0,                                    /* @tp_members@ */
 321   rbuf_pygetset,                        /* @tp_getset@ */
 322   0,                                    /* @tp_base@ */
 323   0,                                    /* @tp_dict@ */
 324   0,                                    /* @tp_descr_get@ */
 325   0,                                    /* @tp_descr_set@ */
 326   0,                                    /* @tp_dictoffset@ */
 327   0,                                    /* @tp_init@ */
 328   PyType_GenericAlloc,                  /* @tp_alloc@ */
 329   rbuf_pynew,                           /* @tp_new@ */
 330   0,                                    /* @tp_free@ */
 331   0                                     /* @tp_is_gc@ */
 332 };
 333
 334 /*----- Write buffers -----------------------------------------------------*/
 335
 336 static void ensure(PyObject *me, size_t n)
 337 {
 338   buf *b = BUF_B(me);
 339
 340   if (BLEFT(b) < n) {
 341     size_t nn = BSZ(b);
 342     octet *p;
 343     size_t want = BLEN(b) + n;
 344     while (nn < want) nn <<= 1;
 345     p = xrealloc(BBASE(b), nn, BSZ(b));
 346     BCUR(b) = p + BLEN(b);
 347     BLIM(b) = p + nn;
 348     BBASE(b) = p;
 349   }
 350 }
 351
 352 static PyObject *wbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 353 {
 354   char *p;
 355   size_t n = 64;
 356   buf_pyobj *me = 0;
 357   static const char *const kwlist[] = { "size", 0 };
 358
 359   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:new", KWLIST,
 360                                    convszt, &n))
 361     goto end;
 362   me = (buf_pyobj *)ty->tp_alloc(ty, 0);
 363   p = xmalloc(n);
 364   me->sub = 0;
 365   buf_init(&me->b, p, n);
 366 end:
 367   return ((PyObject *)me);
 368 }
 369
 370 static Py_ssize_t wbuf_pysegcount(PyObject *me, Py_ssize_t *nn)
 371   { if (nn) *nn = BLEN(BUF_B(me)); return (1); }
 372
 373 static Py_ssize_t wbuf_pyreadbuf(PyObject *me, Py_ssize_t seg, void **q)
 374   { assert(seg == 0); *q = BBASE(BUF_B(me)); return (BLEN(BUF_B(me))); }
 375
 376 static PyObject *wbmeth_zero(PyObject *me, PyObject *arg)
 377 {
 378   void *p;
 379   size_t n;
 380   if (!PyArg_ParseTuple(arg, "O&:zero", convszt, &n)) return (0);
 381   ensure(me, n);
 382   p = buf_get(BUF_B(me), n); assert(p && BOK(BUF_B(me)));
 383   memset(p, 0, n);
 384   RETURN_ME;
 385 }
 386
 387 static PyObject *wbmeth_put(PyObject *me, PyObject *arg)
 388 {
 389   void *p;
 390   Py_ssize_t n;
 391   if (!PyArg_ParseTuple(arg, "s#:put", &p, &n)) return (0);
 392   ensure(me, n);
 393   buf_put(BUF_B(me), p, n); assert(BOK(BUF_B(me)));
 394   RETURN_ME;
 395 }
 396
 397 #define WBMETH_PUTU_(n, W, w)                                           \
 398   static PyObject *wbmeth_putu##w(PyObject *me, PyObject *arg)          \
 399   {                                                                     \
 400     uint##n i;                                                          \
 401     if (!PyArg_ParseTuple(arg, "O&:putu" #w, convu##n, &i)) return (0); \
 402     ensure(me, SZ_##n);                                                 \
 403     buf_putu##w(BUF_B(me), i); assert(BOK(BUF_B(me)));                  \
 404     RETURN_ME;                                                          \
 405   }
 406 DOUINTCONV(WBMETH_PUTU_)
 407
 408 #define SZ_z 1
 409 #define WBMETH_PUTBLK_(n, W, w)                                         \
 410   static PyObject *wbmeth_putblk##w(PyObject *me, PyObject *arg)        \
 411   {                                                                     \
 412     char *p;                                                            \
 413     Py_ssize_t sz;                                                      \
 414     if (!PyArg_ParseTuple(arg, "s#:putblk" #w, &p, &sz)) return (0);    \
 415     ensure(me, sz + SZ_##n);                                            \
 416     buf_putmem##w(BUF_B(me), p, sz); assert(BOK(BUF_B(me)));            \
 417     RETURN_ME;                                                          \
 418   }
 419 BUF_DOSUFFIXES(WBMETH_PUTBLK_)
 420
 421 static PyObject *wbmeth_putmp(PyObject *me, PyObject *arg)
 422 {
 423   mp *x = 0;
 424   if (!PyArg_ParseTuple(arg, "O&:putmp", convmp, &x)) return (0);
 425   ensure(me, mp_octets(x) + 2);
 426   buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
 427   RETURN_ME;
 428 }
 429
 430 static PyObject *wbmeth_putgf(PyObject *me, PyObject *arg)
 431 {
 432   mp *x = 0;
 433   if (!PyArg_ParseTuple(arg, "O&:putgf", convgf, &x)) return (0);
 434   ensure(me, mp_octets(x) + 2);
 435   buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
 436   MP_DROP(x);
 437   RETURN_ME;
 438 }
 439
 440 static PyObject *wbmeth_putecpt(PyObject *me, PyObject *arg)
 441 {
 442   ec pt = EC_INIT;
 443   if (!PyArg_ParseTuple(arg, "O&:putecpt", convecpt, &pt)) return (0);
 444   if (EC_ATINF(&pt)) ensure(me, 2);
 445   else ensure(me, 4 + mp_octets(pt.x) + mp_octets(pt.y));
 446   buf_putec(BUF_B(me), &pt); assert(BOK(BUF_B(me)));
 447   EC_DESTROY(&pt);
 448   RETURN_ME;
 449 }
 450
 451 static PyObject *wbmeth_putecptraw(PyObject *me, PyObject *arg)
 452 {
 453   PyObject *ptobj;
 454   ec pt = EC_INIT;
 455   if (!PyArg_ParseTuple(arg, "O!:putecptraw", ecptcurve_pytype, &ptobj))
 456     return (0);
 457   EC_OUT(ECPT_C(ptobj), &pt, ECPT_P(ptobj));
 458   ensure(me, ECPT_C(ptobj)->f->noctets * 2 + 1);
 459   ec_putraw(ECPT_C(ptobj), BUF_B(me), &pt); assert(BOK(BUF_B(me)));
 460   EC_DESTROY(&pt);
 461   RETURN_ME;
 462 }
 463
 464 static PyObject *wbmeth_putge(PyObject *me, PyObject *arg)
 465 {
 466   PyObject *geobj;
 467   if (!PyArg_ParseTuple(arg, "O!:putge", ge_pytype, &geobj)) return (0);
 468   ensure(me, GE_G(geobj)->noctets);
 469   G_TOBUF(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
 470   RETURN_ME;
 471 }
 472
 473 static PyObject *wbmeth_putgeraw(PyObject *me, PyObject *arg)
 474 {
 475   PyObject *geobj;
 476   if (!PyArg_ParseTuple(arg, "O!:putgeraw", ge_pytype, &geobj)) return (0);
 477   ensure(me, GE_G(geobj)->noctets);
 478   G_TORAW(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
 479   RETURN_ME;
 480 }
 481
 482 static PyObject *wbget_size(PyObject *me, void *hunoz)
 483   { return (PyInt_FromLong(BLEN(BUF_B(me)))); }
 484
 485 static PyObject *wbget_contents(PyObject *me, void *hunoz)
 486   { return (bytestring_pywrap(BBASE(BUF_B(me)), BLEN(BUF_B(me)))); }
 487
 488 static PyGetSetDef wbuf_pygetset[] = {
 489 #define GETSETNAME(op, name) wb##op##_##name
 490   GET   (size,                  "WBUF.size -> SIZE")
 491   GET   (contents,              "WBUF.contents -> STR")
 492 #undef GETSETNAME
 493   { 0 }
 494 };
 495
 496 static PyMethodDef wbuf_pymethods[] = {
 497 #define METHNAME(func) wbmeth_##func
 498   METH  (zero,                  "WBUF.zero(N)")
 499   METH  (put,                   "WBUF.put(BYTES)")
 500 #define WBMETH_DECL_PUTU_(n, W, w)                                      \
 501     METH(putu##w, "WBUF.putu" #w "(INT)")
 502   DOUINTCONV(WBMETH_DECL_PUTU_)
 503 #define WBMETH_DECL_PUTBLK_(n, W, w)                                    \
 504     METH(putblk##w, "WBUF.putblk" #w "(BYTES)")
 505   BUF_DOSUFFIXES(WBMETH_DECL_PUTBLK_)
 506   METH  (putmp,                 "WBUF.putmp(X)")
 507   METH  (putgf,                 "WBUF.putgf(X)")
 508   KWMETH(putecpt,               "WBUF.putecpt(P)")
 509   METH  (putecptraw,            "WBUF.putecptraw(P)")
 510   METH  (putge,                 "WBUF.putge(X)")
 511   METH  (putgeraw,              "WBUF.putgeraw(X)")
 512 #undef METHNAME
 513   { 0 }
 514 };
 515
 516 static PyBufferProcs wbuf_pybuffer = {
 517   wbuf_pyreadbuf,                       /* @bf_getreadbuffer@ */
 518   0,                                    /* @bf_getwritebuffer@ */
 519   wbuf_pysegcount,                      /* @bf_getsegcount@ */
 520   0                                     /* @bf_getcharbuffer@ */
 521 };
 522
 523 static PyTypeObject wbuf_pytype_skel = {
 524   PyObject_HEAD_INIT(0) 0,              /* Header */
 525   "WriteBuffer",                        /* @tp_name@ */
 526   sizeof(buf_pyobj),                    /* @tp_basicsize@ */
 527   0,                                    /* @tp_itemsize@ */
 528
 529   buf_pydealloc,                        /* @tp_dealloc@ */
 530   0,                                    /* @tp_print@ */
 531   0,                                    /* @tp_getattr@ */
 532   0,                                    /* @tp_setattr@ */
 533   0,                                    /* @tp_compare@ */
 534   0,                                    /* @tp_repr@ */
 535   0,                                    /* @tp_as_number@ */
 536   0,                                    /* @tp_as_sequence@ */
 537   0,                                    /* @tp_as_mapping@ */
 538   0,                                    /* @tp_hash@ */
 539   0,                                    /* @tp_call@ */
 540   0,                                    /* @tp_str@ */
 541   0,                                    /* @tp_getattro@ */
 542   0,                                    /* @tp_setattro@ */
 543   &wbuf_pybuffer,                       /* @tp_as_buffer@ */
 544   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 545     Py_TPFLAGS_BASETYPE,
 546
 547   /* @tp_doc@ */
 548 "WriteBuffer([size = ?]): a write buffer.",
 549
 550   0,                                    /* @tp_traverse@ */
 551   0,                                    /* @tp_clear@ */
 552   0,                                    /* @tp_richcompare@ */
 553   0,                                    /* @tp_weaklistoffset@ */
 554   0,                                    /* @tp_iter@ */
 555   0,                                    /* @tp_iternext@ */
 556   wbuf_pymethods,                       /* @tp_methods@ */
 557   0,                                    /* @tp_members@ */
 558   wbuf_pygetset,                        /* @tp_getset@ */
 559   0,                                    /* @tp_base@ */
 560   0,                                    /* @tp_dict@ */
 561   0,                                    /* @tp_descr_get@ */
 562   0,                                    /* @tp_descr_set@ */
 563   0,                                    /* @tp_dictoffset@ */
 564   0,                                    /* @tp_init@ */
 565   PyType_GenericAlloc,                  /* @tp_alloc@ */
 566   wbuf_pynew,                           /* @tp_new@ */
 567   0,                                    /* @tp_free@ */
 568   0                                     /* @tp_is_gc@ */
 569 };
 570
 571 /*----- Initialization ----------------------------------------------------*/
 572
 573 void buffer_pyinit(void)
 574 {
 575   INITTYPE(rbuf, root);
 576   INITTYPE(wbuf, root);
 577 }
 578
 579 void buffer_pyinsert(PyObject *mod)
 580 {
 581   INSEXC("BufferError", buferr, PyExc_Exception, 0);
 582   INSERT("ReadBuffer", rbuf_pytype);
 583   INSERT("WriteBuffer", wbuf_pytype);
 584 }
 585
 586 /*----- That's all, folks -------------------------------------------------*/