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(str) do { PyErr_SetString(buferr, str); goto end; } while (0)
  50
  51 /*----- Read buffers ------------------------------------------------------*/
  52
  53 static PyObject *rbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
  54 {
  55   struct bin in;
  56   void *q;
  57   buf_pyobj *me = 0;
  58   static const char *const kwlist[] = { "data", 0 };
  59
  60   if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&:new", KWLIST, convbin, &in))
  61     goto end;
  62   q = xmalloc(in.sz);
  63   memcpy(q, in.p, in.sz);
  64   me = (buf_pyobj *)ty->tp_alloc(ty, 0);
  65   me->sub = 0;
  66   buf_init(&me->b, q, in.sz);
  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("buffer exhausted");
  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("buffer exhausted");
 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)                         \
 111   {                                                                     \
 112     uint##n x;                                                          \
 113     if (buf_getu##w(BUF_B(me), &x)) BUFERR("buffer exhausted");         \
 114     if (MASK##W <= ULONG_MAX) return (getulong(x));                     \
 115     else { kludge64 y; ASSIGN64(y, x); return (getk64(y)); }            \
 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)                       \
 123   {                                                                     \
 124     size_t sz;                                                          \
 125     char *q;                                                            \
 126     if ((q = buf_getmem##w(BUF_B(me), &sz)) == 0)                       \
 127       BUFERR("buffer exhausted");                                       \
 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)                       \
 136   {                                                                     \
 137     buf_pyobj *b;                                                       \
 138     buf bb;                                                             \
 139     if (buf_getbuf##w(BUF_B(me), &bb)) BUFERR("buffer exhausted");      \
 140     b = PyObject_NEW(buf_pyobj, rbuf_pytype);                           \
 141     b->b = bb;                                                          \
 142     b->sub = me;                                                        \
 143     Py_INCREF(me);                                                      \
 144     return ((PyObject *)b);                                             \
 145   end:                                                                  \
 146     return (0);                                                         \
 147   }
 148 BUF_DOSUFFIXES(RBMETH_GETBUF_)
 149
 150 static PyObject *rbmeth_getmp(PyObject *me)
 151 {
 152   mp *x;
 153   if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR("buffer exhausted");
 154   return (mp_pywrap(x));
 155 end:
 156   return (0);
 157 }
 158
 159 static PyObject *rbmeth_getgf(PyObject *me)
 160 {
 161   mp *x;
 162   if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR("buffer exhausted");
 163   return (gf_pywrap(x));
 164 end:
 165   return (0);
 166 }
 167
 168 static PyObject *rbmeth_getecpt(PyObject *me, PyObject *arg, PyObject *kw)
 169 {
 170   PyObject *cobj = Py_None;
 171   static const char *const kwlist[] = { "curve", 0 };
 172   ec pt = EC_INIT;
 173   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O:getecpt", KWLIST, &cobj))
 174     goto end;
 175   if (cobj == Py_None) cobj = (PyObject *)ecpt_pytype;
 176   if (!PyType_Check(cobj) ||
 177       !PyType_IsSubtype((PyTypeObject *)cobj, ecpt_pytype))
 178     TYERR("expected elliptic curve type");
 179   if (buf_getec(BUF_B(me), &pt)) BUFERR("buffer exhausted");
 180   return (ecpt_pywrapout(cobj, &pt));
 181 end:
 182   return (0);
 183 }
 184
 185 static PyObject *rbmeth_getecptraw(PyObject *me, PyObject *arg)
 186 {
 187   PyObject *cobj;
 188   ec pt = EC_INIT;
 189   PyObject *rc = 0;
 190   if (!PyArg_ParseTuple(arg, "O!:getecptraw", eccurve_pytype, &cobj))
 191     goto end;
 192   if (ec_getraw(ECCURVE_C(cobj), BUF_B(me), &pt)) BUFERR("buffer exhausted");
 193   rc = ecpt_pywrapout(cobj, &pt);
 194 end:
 195   return (rc);
 196 }
 197
 198 static PyObject *rbmeth_getge(PyObject *me, PyObject *arg)
 199 {
 200   PyObject *gobj;
 201   ge *x = 0;
 202   if (!PyArg_ParseTuple(arg, "O!:getge", group_pytype, &gobj)) goto end;
 203   x = G_CREATE(GROUP_G(gobj));
 204   if (G_FROMBUF(GROUP_G(gobj), BUF_B(me), x)) BUFERR("buffer exhausted");
 205   return (ge_pywrap(gobj, x));
 206 end:
 207   if (x) G_DESTROY(GROUP_G(gobj), x);
 208   return (0);
 209 }
 210
 211 static PyObject *rbmeth_getgeraw(PyObject *me, PyObject *arg)
 212 {
 213   PyObject *gobj;
 214   ge *x = 0;
 215   if (!PyArg_ParseTuple(arg, "O!:getgeraw", group_pytype, &gobj)) goto end;
 216   x = G_CREATE(GROUP_G(gobj));
 217   if (G_FROMRAW(GROUP_G(gobj), BUF_B(me), x)) BUFERR("buffer exhausted");
 218   return (ge_pywrap(gobj, x));
 219 end:
 220   if (x) G_DESTROY(GROUP_G(gobj), x);
 221   return (0);
 222 }
 223
 224 static PyObject *rbget_size(PyObject *me, void *hunoz)
 225   { return (PyInt_FromLong(BSZ(BUF_B(me)))); }
 226 static PyObject *rbget_left(PyObject *me, void *hunoz)
 227   { return (PyInt_FromLong(BLEFT(BUF_B(me)))); }
 228 static PyObject *rbget_endp(PyObject *me, void *hunoz)
 229   { return (getbool(!BLEFT(BUF_B(me)))); }
 230 static PyObject *rbget_offset(PyObject *me, void *hunoz)
 231   { return (PyInt_FromLong(BLEN(BUF_B(me)))); }
 232 static int rbset_offset(PyObject *me, PyObject *x, void *hunoz)
 233 {
 234   size_t n;
 235   if (!x) NIERR("__del__");
 236   if (!convszt(x, &n)) goto end;
 237   if (n > BSZ(BUF_B(me))) VALERR("out of range");
 238   BCUR(BUF_B(me)) = BBASE(BUF_B(me)) + n;
 239   return (0);
 240 end:
 241   return (-1);
 242 }
 243
 244 static const PyGetSetDef rbuf_pygetset[] = {
 245 #define GETSETNAME(op, name) rb##op##_##name
 246   GET   (size,          "RBUF.size -> SIZE")
 247   GET   (left,          "RBUF.left -> REMAINDER")
 248   GET   (endp,          "RBUF.endp -> BOOL")
 249   GETSET(offset,        "RBUF.offset -> OFFSET")
 250 #undef GETSETNAME
 251   { 0 }
 252 };
 253
 254 static const PyMethodDef rbuf_pymethods[] = {
 255 #define METHNAME(func) rbmeth_##func
 256   METH  (skip,          "RBUF.skip(N)")
 257   METH  (get,           "RBUF.get(N) -> BYTES")
 258 #define RBMETH_DECL_GETU_(n, W, w)                                      \
 259     NAMETH(getu##w,     "RBUF.getu" #w "() -> INT")
 260   DOUINTCONV(RBMETH_DECL_GETU_)
 261 #define RBMETH_DECL_GETBLK_(n, W, w)                                    \
 262     NAMETH(getblk##w,   "RBUF.getblk" #w "() -> BYTES")
 263   BUF_DOSUFFIXES(RBMETH_DECL_GETBLK_)
 264 #define RBMETH_DECL_GETBUF_(n, W, w)                                    \
 265     NAMETH(getbuf##w,   "RBUF.getbuf" #w "() -> RBUF'")
 266   BUF_DOSUFFIXES(RBMETH_DECL_GETBUF_)
 267   NAMETH(getmp,         "RBUF.getmp() -> X")
 268   NAMETH(getgf,         "RBUF.getgf() -> X")
 269   KWMETH(getecpt,       "RBUF.getecpt([curve = None]) -> P")
 270   METH  (getecptraw,    "RBUF.getecptraw(CURVE) -> P")
 271   METH  (getge,         "RBUF.getge(GROUP) -> X")
 272   METH  (getgeraw,      "RBUF.getgeraw(GROUP) -> X")
 273 #undef METHNAME
 274   { 0 }
 275 };
 276
 277 static const PyBufferProcs rbuf_pybuffer = {
 278   rbuf_pyreadbuf,                       /* @bf_getreadbuffer@ */
 279   0,                                    /* @bf_getwritebuffer@ */
 280   rbuf_pysegcount,                      /* @bf_getsegcount@ */
 281   0                                     /* @bf_getcharbuffer@ */
 282 };
 283
 284 static const PyTypeObject rbuf_pytype_skel = {
 285   PyVarObject_HEAD_INIT(0, 0)           /* Header */
 286   "ReadBuffer",                         /* @tp_name@ */
 287   sizeof(buf_pyobj),                    /* @tp_basicsize@ */
 288   0,                                    /* @tp_itemsize@ */
 289
 290   buf_pydealloc,                        /* @tp_dealloc@ */
 291   0,                                    /* @tp_print@ */
 292   0,                                    /* @tp_getattr@ */
 293   0,                                    /* @tp_setattr@ */
 294   0,                                    /* @tp_compare@ */
 295   0,                                    /* @tp_repr@ */
 296   0,                                    /* @tp_as_number@ */
 297   0,                                    /* @tp_as_sequence@ */
 298   0,                                    /* @tp_as_mapping@ */
 299   0,                                    /* @tp_hash@ */
 300   0,                                    /* @tp_call@ */
 301   0,                                    /* @tp_str@ */
 302   0,                                    /* @tp_getattro@ */
 303   0,                                    /* @tp_setattro@ */
 304   PYBUFFER(rbuf),                       /* @tp_as_buffer@ */
 305   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 306     Py_TPFLAGS_BASETYPE,
 307
 308   /* @tp_doc@ */
 309   "ReadBuffer(STR): a read buffer.",
 310
 311   0,                                    /* @tp_traverse@ */
 312   0,                                    /* @tp_clear@ */
 313   0,                                    /* @tp_richcompare@ */
 314   0,                                    /* @tp_weaklistoffset@ */
 315   0,                                    /* @tp_iter@ */
 316   0,                                    /* @tp_iternext@ */
 317   PYMETHODS(rbuf),                      /* @tp_methods@ */
 318   0,                                    /* @tp_members@ */
 319   PYGETSET(rbuf),                       /* @tp_getset@ */
 320   0,                                    /* @tp_base@ */
 321   0,                                    /* @tp_dict@ */
 322   0,                                    /* @tp_descr_get@ */
 323   0,                                    /* @tp_descr_set@ */
 324   0,                                    /* @tp_dictoffset@ */
 325   0,                                    /* @tp_init@ */
 326   PyType_GenericAlloc,                  /* @tp_alloc@ */
 327   rbuf_pynew,                           /* @tp_new@ */
 328   0,                                    /* @tp_free@ */
 329   0                                     /* @tp_is_gc@ */
 330 };
 331
 332 /*----- Write buffers -----------------------------------------------------*/
 333
 334 static void ensure(PyObject *me, size_t n)
 335 {
 336   buf *b = BUF_B(me);
 337
 338   if (BLEFT(b) < n) {
 339     size_t nn = BSZ(b);
 340     octet *p;
 341     size_t want = BLEN(b) + n;
 342     while (nn < want) nn <<= 1;
 343     p = xrealloc(BBASE(b), nn, BSZ(b));
 344     BCUR(b) = p + BLEN(b);
 345     BLIM(b) = p + nn;
 346     BBASE(b) = p;
 347   }
 348 }
 349
 350 static PyObject *wbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
 351 {
 352   char *p;
 353   size_t n = 64;
 354   buf_pyobj *me = 0;
 355   static const char *const kwlist[] = { "size", 0 };
 356
 357   if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:new", KWLIST,
 358                                    convszt, &n))
 359     goto end;
 360   me = (buf_pyobj *)ty->tp_alloc(ty, 0);
 361   p = xmalloc(n);
 362   me->sub = 0;
 363   buf_init(&me->b, p, n);
 364 end:
 365   return ((PyObject *)me);
 366 }
 367
 368 static Py_ssize_t wbuf_pysegcount(PyObject *me, Py_ssize_t *nn)
 369   { if (nn) *nn = BLEN(BUF_B(me)); return (1); }
 370
 371 static Py_ssize_t wbuf_pyreadbuf(PyObject *me, Py_ssize_t seg, void **q)
 372   { assert(seg == 0); *q = BBASE(BUF_B(me)); return (BLEN(BUF_B(me))); }
 373
 374 static PyObject *wbmeth_zero(PyObject *me, PyObject *arg)
 375 {
 376   void *p;
 377   size_t n;
 378   if (!PyArg_ParseTuple(arg, "O&:zero", convszt, &n)) return (0);
 379   ensure(me, n);
 380   p = buf_get(BUF_B(me), n); assert(p && BOK(BUF_B(me)));
 381   memset(p, 0, n);
 382   RETURN_ME;
 383 }
 384
 385 static PyObject *wbmeth_put(PyObject *me, PyObject *arg)
 386 {
 387   struct bin in;
 388   if (!PyArg_ParseTuple(arg, "O&:put", convbin, &in)) return (0);
 389   ensure(me, in.sz);
 390   buf_put(BUF_B(me), in.p, in.sz); assert(BOK(BUF_B(me)));
 391   RETURN_ME;
 392 }
 393
 394 #define WBMETH_PUTU_(n, W, w)                                           \
 395   static PyObject *wbmeth_putu##w(PyObject *me, PyObject *arg)          \
 396   {                                                                     \
 397     uint##n i;                                                          \
 398     if (!PyArg_ParseTuple(arg, "O&:putu" #w, convu##n, &i)) return (0); \
 399     ensure(me, SZ_##n);                                                 \
 400     buf_putu##w(BUF_B(me), i); assert(BOK(BUF_B(me)));                  \
 401     RETURN_ME;                                                          \
 402   }
 403 DOUINTCONV(WBMETH_PUTU_)
 404
 405 #define MASKz 0
 406 #define SZ_z 1
 407 #define WBMETH_PUTBLK_(n, W, w)                                         \
 408   static PyObject *wbmeth_putblk##w(PyObject *me, PyObject *arg)        \
 409   {                                                                     \
 410     struct bin in;                                                      \
 411     if (!PyArg_ParseTuple(arg, "O&:putblk" #w, convbin, &in)) goto end; \
 412     if (MASK##W && in.sz > MASK##W) VALERR("too large");                \
 413     ensure(me, in.sz + SZ_##n);                                         \
 414     buf_putmem##w(BUF_B(me), in.p, in.sz); assert(BOK(BUF_B(me)));      \
 415     RETURN_ME;                                                          \
 416   end:                                                                  \
 417     return (0);                                                         \
 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   ensure(me, EC_ATINF(&pt) ? 2 : 6 + mp_octets(pt.x) + mp_octets(pt.y));
 445   buf_putec(BUF_B(me), &pt); assert(BOK(BUF_B(me)));
 446   EC_DESTROY(&pt);
 447   RETURN_ME;
 448 }
 449
 450 static PyObject *wbmeth_putecptraw(PyObject *me, PyObject *arg)
 451 {
 452   PyObject *ptobj;
 453   ec pt = EC_INIT;
 454   if (!PyArg_ParseTuple(arg, "O!:putecptraw", ecptcurve_pytype, &ptobj))
 455     return (0);
 456   EC_OUT(ECPT_C(ptobj), &pt, ECPT_P(ptobj));
 457   ensure(me, ECPT_C(ptobj)->f->noctets * 2 + 1);
 458   ec_putraw(ECPT_C(ptobj), BUF_B(me), &pt); assert(BOK(BUF_B(me)));
 459   EC_DESTROY(&pt);
 460   RETURN_ME;
 461 }
 462
 463 static PyObject *wbmeth_putge(PyObject *me, PyObject *arg)
 464 {
 465   PyObject *geobj;
 466   if (!PyArg_ParseTuple(arg, "O!:putge", ge_pytype, &geobj)) return (0);
 467   ensure(me, GE_G(geobj)->noctets);
 468   G_TOBUF(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
 469   RETURN_ME;
 470 }
 471
 472 static PyObject *wbmeth_putgeraw(PyObject *me, PyObject *arg)
 473 {
 474   PyObject *geobj;
 475   if (!PyArg_ParseTuple(arg, "O!:putgeraw", ge_pytype, &geobj)) return (0);
 476   ensure(me, GE_G(geobj)->noctets);
 477   G_TORAW(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
 478   RETURN_ME;
 479 }
 480
 481 static PyObject *wbget_size(PyObject *me, void *hunoz)
 482   { return (PyInt_FromLong(BLEN(BUF_B(me)))); }
 483
 484 static PyObject *wbget_contents(PyObject *me, void *hunoz)
 485   { return (bytestring_pywrap(BBASE(BUF_B(me)), BLEN(BUF_B(me)))); }
 486
 487 static const PyGetSetDef wbuf_pygetset[] = {
 488 #define GETSETNAME(op, name) wb##op##_##name
 489   GET   (size,          "WBUF.size -> SIZE")
 490   GET   (contents,      "WBUF.contents -> STR")
 491 #undef GETSETNAME
 492   { 0 }
 493 };
 494
 495 static const PyMethodDef wbuf_pymethods[] = {
 496 #define METHNAME(func) wbmeth_##func
 497   METH  (zero,          "WBUF.zero(N)")
 498   METH  (put,           "WBUF.put(BYTES)")
 499 #define WBMETH_DECL_PUTU_(n, W, w)                                      \
 500     METH(putu##w,       "WBUF.putu" #w "(INT)")
 501   DOUINTCONV(WBMETH_DECL_PUTU_)
 502 #define WBMETH_DECL_PUTBLK_(n, W, w)                                    \
 503     METH(putblk##w,     "WBUF.putblk" #w "(BYTES)")
 504   BUF_DOSUFFIXES(WBMETH_DECL_PUTBLK_)
 505   METH  (putmp,         "WBUF.putmp(X)")
 506   METH  (putgf,         "WBUF.putgf(X)")
 507   METH  (putecpt,       "WBUF.putecpt(P)")
 508   METH  (putecptraw,    "WBUF.putecptraw(P)")
 509   METH  (putge,         "WBUF.putge(X)")
 510   METH  (putgeraw,      "WBUF.putgeraw(X)")
 511 #undef METHNAME
 512   { 0 }
 513 };
 514
 515 static const PyBufferProcs wbuf_pybuffer = {
 516   wbuf_pyreadbuf,                       /* @bf_getreadbuffer@ */
 517   0,                                    /* @bf_getwritebuffer@ */
 518   wbuf_pysegcount,                      /* @bf_getsegcount@ */
 519   0                                     /* @bf_getcharbuffer@ */
 520 };
 521
 522 static const PyTypeObject wbuf_pytype_skel = {
 523   PyVarObject_HEAD_INIT(0, 0)           /* Header */
 524   "WriteBuffer",                        /* @tp_name@ */
 525   sizeof(buf_pyobj),                    /* @tp_basicsize@ */
 526   0,                                    /* @tp_itemsize@ */
 527
 528   buf_pydealloc,                        /* @tp_dealloc@ */
 529   0,                                    /* @tp_print@ */
 530   0,                                    /* @tp_getattr@ */
 531   0,                                    /* @tp_setattr@ */
 532   0,                                    /* @tp_compare@ */
 533   0,                                    /* @tp_repr@ */
 534   0,                                    /* @tp_as_number@ */
 535   0,                                    /* @tp_as_sequence@ */
 536   0,                                    /* @tp_as_mapping@ */
 537   0,                                    /* @tp_hash@ */
 538   0,                                    /* @tp_call@ */
 539   0,                                    /* @tp_str@ */
 540   0,                                    /* @tp_getattro@ */
 541   0,                                    /* @tp_setattro@ */
 542   PYBUFFER(wbuf),                       /* @tp_as_buffer@ */
 543   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 544     Py_TPFLAGS_BASETYPE,
 545
 546   /* @tp_doc@ */
 547   "WriteBuffer([size = ?]): a write buffer.",
 548
 549   0,                                    /* @tp_traverse@ */
 550   0,                                    /* @tp_clear@ */
 551   0,                                    /* @tp_richcompare@ */
 552   0,                                    /* @tp_weaklistoffset@ */
 553   0,                                    /* @tp_iter@ */
 554   0,                                    /* @tp_iternext@ */
 555   PYMETHODS(wbuf),                      /* @tp_methods@ */
 556   0,                                    /* @tp_members@ */
 557   PYGETSET(wbuf),                       /* @tp_getset@ */
 558   0,                                    /* @tp_base@ */
 559   0,                                    /* @tp_dict@ */
 560   0,                                    /* @tp_descr_get@ */
 561   0,                                    /* @tp_descr_set@ */
 562   0,                                    /* @tp_dictoffset@ */
 563   0,                                    /* @tp_init@ */
 564   PyType_GenericAlloc,                  /* @tp_alloc@ */
 565   wbuf_pynew,                           /* @tp_new@ */
 566   0,                                    /* @tp_free@ */
 567   0                                     /* @tp_is_gc@ */
 568 };
 569
 570 /*----- Initialization ----------------------------------------------------*/
 571
 572 void buffer_pyinit(void)
 573 {
 574   INITTYPE(rbuf, root);
 575   INITTYPE(wbuf, root);
 576 }
 577
 578 void buffer_pyinsert(PyObject *mod)
 579 {
 580   INSEXC("BufferError", buferr, PyExc_Exception, 0);
 581   INSERT("ReadBuffer", rbuf_pytype);
 582   INSERT("WriteBuffer", wbuf_pytype);
 583 }
 584
 585 /*----- That's all, folks -------------------------------------------------*/