[catacomb-python] / buffer.c

/* -*-c-*-
 *
 * Reading and writing buffers of stuff
 *
 * (c) 2005 Straylight/Edgeware
 */

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

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

#include "catacomb-python.h"

/*----- Read buffers ------------------------------------------------------*/

PyTypeObject *rbuf_pytype;

static PyObject *rbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
{
  struct bin in;
  void *q;
  buf_pyobj *me = 0;
  static const char *const kwlist[] = { "data", 0 };

  if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&:new", KWLIST, convbin, &in))
    goto end;
  q = xmalloc(in.sz);
  memcpy(q, in.p, in.sz);
  me = (buf_pyobj *)ty->tp_alloc(ty, 0);
  me->sub = 0; me->lk = 0;
  buf_init(&me->b, q, in.sz);
end:
  return ((PyObject *)me);
}

static void buf_pydealloc(PyObject *me)
{
  assert(!BUF_LK(me));
  if (BUF_SUB(me)) Py_DECREF(BUF_SUB(me));
  else xfree(BBASE(BUF_B(me)));
  FREEOBJ(me);
}

#ifdef PY3
  static int rbuf_pygetbuf(PyObject *me, Py_buffer *vw, int f)
  {
    buf *b = BUF_B(me);
    return (PyBuffer_FillInfo(vw, me, BCUR(b), BLEFT(b), 1, f));
  }
#else
  static Py_ssize_t rbuf_pysegcount(PyObject *me, Py_ssize_t *nn)
    { if (nn) *nn = BSZ(BUF_B(me)); return (1); }
  static Py_ssize_t rbuf_pyreadbuf(PyObject *me, Py_ssize_t seg, void **q)
    { assert(seg == 0); *q = BCUR(BUF_B(me)); return (BLEFT(BUF_B(me))); }
#endif

static PyObject *rbmeth_skip(PyObject *me, PyObject *arg)
{
  size_t n;

  if (!PyArg_ParseTuple(arg, "O&:skip", convszt, &n)) goto end;
  if (!buf_get(BUF_B(me), n)) BUFERR("buffer exhausted");
  RETURN_ME;
end:
  return (0);
}

static PyObject *rbmeth_get(PyObject *me, PyObject *arg)
{
  void *p;
  size_t n;

  if (!PyArg_ParseTuple(arg, "O&:get", convszt, &n)) goto end;
  if ((p = buf_get(BUF_B(me), n)) == 0) BUFERR("buffer exhausted");
  return (bytestring_pywrap(p, n));
end:
  return (0);
}

#define RBMETH_GETU_(n, W, w)						\
  static PyObject *rbmeth_getu##w(PyObject *me)				\
  {									\
    uint##n x;								\
    if (buf_getu##w(BUF_B(me), &x)) BUFERR("buffer exhausted");		\
    if (MASK##W <= ULONG_MAX) return (getulong(x));			\
    else { kludge64 y; ASSIGN64(y, x); return (getk64(y)); }		\
  end:									\
    return (0);								\
  }
DOUINTCONV(RBMETH_GETU_)

#define RBMETH_GETBLK_(n, W, w)						\
  static PyObject *rbmeth_getblk##w(PyObject *me)			\
  {									\
    size_t sz;								\
    char *q;								\
    if ((q = buf_getmem##w(BUF_B(me), &sz)) == 0)			\
      BUFERR("buffer exhausted");					\
    return (bytestring_pywrap(q, sz));					\
  end:									\
    return (0);								\
  }
BUF_DOSUFFIXES(RBMETH_GETBLK_)

#define RBMETH_GETBUF_(n, W, w)						\
  static PyObject *rbmeth_getbuf##w(PyObject *me)			\
  {									\
    buf_pyobj *b;							\
    buf bb;								\
    if (buf_getbuf##w(BUF_B(me), &bb)) BUFERR("buffer exhausted");	\
    b = PyObject_NEW(buf_pyobj, rbuf_pytype);				\
    b->b = bb;								\
    b->sub = me;							\
    b->lk = 0;								\
    Py_INCREF(me);							\
    return ((PyObject *)b);						\
  end:									\
    return (0);								\
  }
BUF_DOSUFFIXES(RBMETH_GETBUF_)

static PyObject *rbmeth_getmp(PyObject *me)
{
  mp *x;
  if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR("buffer exhausted");
  return (mp_pywrap(x));
end:
  return (0);
}

static PyObject *rbmeth_getgf(PyObject *me)
{
  mp *x;
  if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR("buffer exhausted");
  return (gf_pywrap(x));
end:
  return (0);
}

static PyObject *rbmeth_getecpt(PyObject *me, PyObject *arg, PyObject *kw)
{
  PyObject *cobj = Py_None;
  static const char *const kwlist[] = { "curve", 0 };
  ec pt = EC_INIT;
  if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O:getecpt", KWLIST, &cobj))
    goto end;
  if (cobj == Py_None) cobj = (PyObject *)ecpt_pytype;
  if (!PyType_Check(cobj) ||
      !PyType_IsSubtype((PyTypeObject *)cobj, ecpt_pytype))
    TYERR("expected elliptic curve type");
  if (buf_getec(BUF_B(me), &pt)) BUFERR("buffer exhausted");
  return (ecpt_pywrapout(cobj, &pt));
end:
  return (0);
}

static PyObject *rbmeth_getecptraw(PyObject *me, PyObject *arg)
{
  PyObject *cobj;
  ec pt = EC_INIT;
  PyObject *rc = 0;
  if (!PyArg_ParseTuple(arg, "O!:getecptraw", eccurve_pytype, &cobj))
    goto end;
  if (ec_getraw(ECCURVE_C(cobj), BUF_B(me), &pt)) BUFERR("buffer exhausted");
  rc = ecpt_pywrapout(cobj, &pt);
end:
  return (rc);
}

static PyObject *rbmeth_os2ecp(PyObject *me, PyObject *arg, PyObject *kw)
{
  PyObject *cobj;
  ec pt = EC_INIT;
  unsigned f = EC_XONLY | EC_LSB | EC_SORT | EC_EXPLY;
  PyObject *rc = 0;
  static const char *const kwlist[] = { "curve", "flags", 0 };
  if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!|O&:os2ecp", KWLIST,
				   eccurve_pytype, &cobj, convuint, &f))
    goto end;
  if (ec_os2ecp(ECCURVE_C(cobj), f, BUF_B(me), &pt)) VALERR("bad point");
  rc = ecpt_pywrapout(cobj, &pt);
end:
  return (rc);
}

static PyObject *rbmeth_getge(PyObject *me, PyObject *arg)
{
  PyObject *gobj;
  ge *x = 0;
  if (!PyArg_ParseTuple(arg, "O!:getge", group_pytype, &gobj)) goto end;
  x = G_CREATE(GROUP_G(gobj));
  if (G_FROMBUF(GROUP_G(gobj), BUF_B(me), x)) BUFERR("buffer exhausted");
  return (ge_pywrap(gobj, x));
end:
  if (x) G_DESTROY(GROUP_G(gobj), x);
  return (0);
}

static PyObject *rbmeth_getgeraw(PyObject *me, PyObject *arg)
{
  PyObject *gobj;
  ge *x = 0;
  if (!PyArg_ParseTuple(arg, "O!:getgeraw", group_pytype, &gobj)) goto end;
  x = G_CREATE(GROUP_G(gobj));
  if (G_FROMRAW(GROUP_G(gobj), BUF_B(me), x)) BUFERR("buffer exhausted");
  return (ge_pywrap(gobj, x));
end:
  if (x) G_DESTROY(GROUP_G(gobj), x);
  return (0);
}

static PyObject *rbget_size(PyObject *me, void *hunoz)
  { return (PyInt_FromLong(BSZ(BUF_B(me)))); }
static PyObject *rbget_left(PyObject *me, void *hunoz)
  { return (PyInt_FromLong(BLEFT(BUF_B(me)))); }
static PyObject *rbget_endp(PyObject *me, void *hunoz)
  { return (getbool(!BLEFT(BUF_B(me)))); }
static PyObject *rbget_offset(PyObject *me, void *hunoz)
  { return (PyInt_FromLong(BLEN(BUF_B(me)))); }
static int rbset_offset(PyObject *me, PyObject *x, void *hunoz)
{
  size_t n;
  if (!x) NIERR("__del__");
  if (!convszt(x, &n)) goto end;
  if (n > BSZ(BUF_B(me))) VALERR("out of range");
  BCUR(BUF_B(me)) = BBASE(BUF_B(me)) + n;
  return (0);
end:
  return (-1);
}

static const PyGetSetDef rbuf_pygetset[] = {
#define GETSETNAME(op, name) rb##op##_##name
  GET	(size,		"RBUF.size -> SIZE")
  GET	(left,		"RBUF.left -> REMAINDER")
  GET	(endp,		"RBUF.endp -> BOOL")
  GETSET(offset,	"RBUF.offset -> OFFSET")
#undef GETSETNAME
  { 0 }
};

static const PyMethodDef rbuf_pymethods[] = {
#define METHNAME(func) rbmeth_##func
  METH	(skip,		"RBUF.skip(N)")
  METH	(get,		"RBUF.get(N) -> BYTES")
#define RBMETH_DECL_GETU_(n, W, w)					\
    NAMETH(getu##w,	"RBUF.getu" #w "() -> INT")
  DOUINTCONV(RBMETH_DECL_GETU_)
#define RBMETH_DECL_GETBLK_(n, W, w)					\
    NAMETH(getblk##w,	"RBUF.getblk" #w "() -> BYTES")
  BUF_DOSUFFIXES(RBMETH_DECL_GETBLK_)
#define RBMETH_DECL_GETBUF_(n, W, w)					\
    NAMETH(getbuf##w,	"RBUF.getbuf" #w "() -> RBUF'")
  BUF_DOSUFFIXES(RBMETH_DECL_GETBUF_)
  NAMETH(getmp,		"RBUF.getmp() -> X")
  NAMETH(getgf,		"RBUF.getgf() -> X")
  KWMETH(getecpt,	"RBUF.getecpt([curve = None]) -> P")
  METH	(getecptraw,	"RBUF.getecptraw(CURVE) -> P")
  KWMETH(os2ecp,	"RBUF.os2ecp(CURVE, [flags = ...]) -> P")
  METH	(getge,		"RBUF.getge(GROUP) -> X")
  METH	(getgeraw,	"RBUF.getgeraw(GROUP) -> X")
#undef METHNAME
  { 0 }
};

static const PyBufferProcs rbuf_pybuffer = {
#ifdef PY3
  rbuf_pygetbuf,			/* @bf_getbuffer@ */
  0,					/* @bf_releasebuffer@ */
#else
  rbuf_pyreadbuf,			/* @bf_getreadbuffer@ */
  0,					/* @bf_getwritebuffer@ */
  rbuf_pysegcount,			/* @bf_getsegcount@ */
  0					/* @bf_getcharbuffer@ */
#endif
};

static const PyTypeObject rbuf_pytype_skel = {
  PyVarObject_HEAD_INIT(0, 0)		/* Header */
  "ReadBuffer",				/* @tp_name@ */
  sizeof(buf_pyobj),			/* @tp_basicsize@ */
  0,					/* @tp_itemsize@ */

  buf_pydealloc,			/* @tp_dealloc@ */
  0,					/* @tp_print@ */
  0,					/* @tp_getattr@ */
  0,					/* @tp_setattr@ */
  0,					/* @tp_compare@ */
  0,					/* @tp_repr@ */
  0,					/* @tp_as_number@ */
  0,					/* @tp_as_sequence@ */
  0,					/* @tp_as_mapping@ */
  0,					/* @tp_hash@ */
  0,					/* @tp_call@ */
  0,					/* @tp_str@ */
  0,					/* @tp_getattro@ */
  0,					/* @tp_setattro@ */
  PYBUFFER(rbuf),			/* @tp_as_buffer@ */
  Py_TPFLAGS_DEFAULT |			/* @tp_flags@ */
    Py_TPFLAGS_BASETYPE,

  /* @tp_doc@ */
  "ReadBuffer(STR): a read buffer.",

  0,					/* @tp_traverse@ */
  0,					/* @tp_clear@ */
  0,					/* @tp_richcompare@ */
  0,					/* @tp_weaklistoffset@ */
  0,					/* @tp_iter@ */
  0,					/* @tp_iternext@ */
  PYMETHODS(rbuf),			/* @tp_methods@ */
  0,					/* @tp_members@ */
  PYGETSET(rbuf),			/* @tp_getset@ */
  0,					/* @tp_base@ */
  0,					/* @tp_dict@ */
  0,					/* @tp_descr_get@ */
  0,					/* @tp_descr_set@ */
  0,					/* @tp_dictoffset@ */
  0,					/* @tp_init@ */
  PyType_GenericAlloc,			/* @tp_alloc@ */
  rbuf_pynew,				/* @tp_new@ */
  0,					/* @tp_free@ */
  0					/* @tp_is_gc@ */
};

/*----- Write buffers -----------------------------------------------------*/

PyTypeObject *wbuf_pytype;

int ensurebuf(PyObject *me, size_t n)
{
  buf *b = BUF_B(me);
  size_t nn = BSZ(b);
  octet *p;
  size_t want = BLEN(b) + n;

  if (BLEFT(b) >= n)
    return (0);
  else if (BUF_LK(me))
    BUFERR("buffer locked");
  else {
    while (nn < want) nn <<= 1;
    p = xrealloc(BBASE(b), nn, BSZ(b));
    BCUR(b) = p + BLEN(b);
    BLIM(b) = p + nn;
    BBASE(b) = p;
    return (0);
  }
end:
  return (-1);
}

static PyObject *wbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
{
  char *p;
  size_t n = 64;
  buf_pyobj *me = 0;
  static const char *const kwlist[] = { "size", 0 };

  if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:new", KWLIST,
				   convszt, &n))
    goto end;
  me = (buf_pyobj *)ty->tp_alloc(ty, 0);
  p = xmalloc(n);
  me->sub = 0; me->lk = 0;
  buf_init(&me->b, p, n);
end:
  return ((PyObject *)me);
}

#ifdef PY3
  static int wbuf_pygetbuf(PyObject *me, Py_buffer *vw, int f)
  {
    buf *b = BUF_B(me);
    if (PyBuffer_FillInfo(vw, me, BBASE(b), BLEN(b), 0, f)) return (-1);
    BUF_LK(me)++; return (0);
  }
  static void wbuf_pyrlsbuf(PyObject *me, Py_buffer *vw)
    { BUF_LK(me)--; }
#else
  static Py_ssize_t wbuf_pysegcount(PyObject *me, Py_ssize_t *nn)
    { if (nn) *nn = BLEN(BUF_B(me)); return (1); }
  static Py_ssize_t wbuf_pyreadbuf(PyObject *me, Py_ssize_t seg, void **q)
    { assert(seg == 0); *q = BBASE(BUF_B(me)); return (BLEN(BUF_B(me))); }
#endif

static PyObject *wbmeth_zero(PyObject *me, PyObject *arg)
{
  void *p;
  size_t n;
  if (!PyArg_ParseTuple(arg, "O&:zero", convszt, &n)) return (0);
  if (ensurebuf(me, n)) return (0);
  p = buf_get(BUF_B(me), n); assert(p && BOK(BUF_B(me)));
  memset(p, 0, n);
  RETURN_ME;
}

static PyObject *wbmeth_put(PyObject *me, PyObject *arg)
{
  struct bin in;
  if (!PyArg_ParseTuple(arg, "O&:put", convbin, &in)) return (0);
  if (ensurebuf(me, in.sz)) return (0);
  buf_put(BUF_B(me), in.p, in.sz); assert(BOK(BUF_B(me)));
  RETURN_ME;
}

#define WBMETH_PUTU_(n, W, w)						\
  static PyObject *wbmeth_putu##w(PyObject *me, PyObject *arg)		\
  {									\
    uint##n i;								\
    if (!PyArg_ParseTuple(arg, "O&:putu" #w, convu##n, &i)) return (0);	\
    if (ensurebuf(me, SZ_##n)) return (0);				\
    buf_putu##w(BUF_B(me), i); assert(BOK(BUF_B(me)));			\
    RETURN_ME;								\
  }
DOUINTCONV(WBMETH_PUTU_)

#define MASKz 0
#define SZ_z 1
#define WBMETH_PUTBLK_(n, W, w)						\
  static PyObject *wbmeth_putblk##w(PyObject *me, PyObject *arg)	\
  {									\
    struct bin in;							\
    if (!PyArg_ParseTuple(arg, "O&:putblk" #w, convbin, &in)) goto end;	\
    if (MASK##W && in.sz > MASK##W) VALERR("too large");		\
    if (ensurebuf(me, in.sz + SZ_##n)) return (0);			\
    buf_putmem##w(BUF_B(me), in.p, in.sz); assert(BOK(BUF_B(me)));	\
    RETURN_ME;								\
  end:									\
    return (0);								\
  }
BUF_DOSUFFIXES(WBMETH_PUTBLK_)

static PyObject *wbmeth_putmp(PyObject *me, PyObject *arg)
{
  mp *x = 0;
  if (!PyArg_ParseTuple(arg, "O&:putmp", convmp, &x)) return (0);
  if (ensurebuf(me, mp_octets(x) + 2)) return (0);
  buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
  RETURN_ME;
}

static PyObject *wbmeth_putgf(PyObject *me, PyObject *arg)
{
  mp *x = 0;
  if (!PyArg_ParseTuple(arg, "O&:putgf", convgf, &x)) return (0);
  if (ensurebuf(me, mp_octets(x) + 2)) return (0);
  buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
  MP_DROP(x);
  RETURN_ME;
}

static PyObject *wbmeth_putecpt(PyObject *me, PyObject *arg)
{
  ec pt = EC_INIT;
  if (!PyArg_ParseTuple(arg, "O&:putecpt", convecpt, &pt)) return (0);
  if (ensurebuf(me, EC_ATINF(&pt) ? 2 :
		6 + mp_octets(pt.x) + mp_octets(pt.y)))
    return (0);
  buf_putec(BUF_B(me), &pt); assert(BOK(BUF_B(me)));
  EC_DESTROY(&pt);
  RETURN_ME;
}

static PyObject *wbmeth_putecptraw(PyObject *me, PyObject *arg)
{
  PyObject *ptobj;
  ec_curve *cc;
  ec pt = EC_INIT;
  if (!PyArg_ParseTuple(arg, "O!:putecptraw", ecptcurve_pytype, &ptobj))
    return (0);
  cc = ECPT_C(ptobj);
  EC_OUT(cc, &pt, ECPT_P(ptobj));
  if (ensurebuf(me, 2*cc->f->noctets + 1)) return (0);
  ec_putraw(cc, BUF_B(me), &pt); assert(BOK(BUF_B(me)));
  EC_DESTROY(&pt);
  RETURN_ME;
}

static PyObject *wbmeth_ec2osp(PyObject *me, PyObject *arg, PyObject *kw)
{
  PyTypeObject *ptobj;
  ec_curve *cc;
  ec pt = EC_INIT;
  unsigned f = EC_EXPLY;
  static const char *const kwlist[] = { "point", "flags", 0 };
  if (!PyArg_ParseTupleAndKeywords(arg, kw, "O!|O&:os2ecp", KWLIST,
				   ecptcurve_pytype, &ptobj, convuint, &f))
    goto end;
  cc = ECPT_C(ptobj);
  EC_OUT(cc, &pt, ECPT_P(ptobj));
  if (ensurebuf(me, 2*cc->f->noctets + 1)) return (0);
  if (ec_ec2osp(cc, f, BUF_B(me), &pt)) VALERR("invalid flags");
  RETURN_ME;
end:
  return (0);
}

static PyObject *wbmeth_putge(PyObject *me, PyObject *arg)
{
  PyObject *geobj;
  if (!PyArg_ParseTuple(arg, "O!:putge", ge_pytype, &geobj)) return (0);
  if (ensurebuf(me, GE_G(geobj)->noctets)) return (0);
  G_TOBUF(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
  RETURN_ME;
}

static PyObject *wbmeth_putgeraw(PyObject *me, PyObject *arg)
{
  PyObject *geobj;
  if (!PyArg_ParseTuple(arg, "O!:putgeraw", ge_pytype, &geobj)) return (0);
  if (ensurebuf(me, GE_G(geobj)->noctets)) return (0);
  G_TORAW(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
  RETURN_ME;
}

static PyObject *wbget_size(PyObject *me, void *hunoz)
  { return (PyInt_FromLong(BLEN(BUF_B(me)))); }

static PyObject *wbget_contents(PyObject *me, void *hunoz)
  { return (bytestring_pywrap(BBASE(BUF_B(me)), BLEN(BUF_B(me)))); }

static const PyGetSetDef wbuf_pygetset[] = {
#define GETSETNAME(op, name) wb##op##_##name
  GET	(size,		"WBUF.size -> SIZE")
  GET	(contents,	"WBUF.contents -> STR")
#undef GETSETNAME
  { 0 }
};

static const PyMethodDef wbuf_pymethods[] = {
#define METHNAME(func) wbmeth_##func
  METH	(zero,		"WBUF.zero(N)")
  METH	(put,		"WBUF.put(BYTES)")
#define WBMETH_DECL_PUTU_(n, W, w)					\
    METH(putu##w,	"WBUF.putu" #w "(INT)")
  DOUINTCONV(WBMETH_DECL_PUTU_)
#define WBMETH_DECL_PUTBLK_(n, W, w)					\
    METH(putblk##w,	"WBUF.putblk" #w "(BYTES)")
  BUF_DOSUFFIXES(WBMETH_DECL_PUTBLK_)
  METH	(putmp,		"WBUF.putmp(X)")
  METH	(putgf,		"WBUF.putgf(X)")
  METH	(putecpt,	"WBUF.putecpt(P)")
  METH	(putecptraw,	"WBUF.putecptraw(P)")
  KWMETH(ec2osp,	"WBUF.ec2osp(P, [flags = EC_EXPLY])")
  METH	(putge,		"WBUF.putge(X)")
  METH	(putgeraw,	"WBUF.putgeraw(X)")
#undef METHNAME
  { 0 }
};

static const PyBufferProcs wbuf_pybuffer = {
#ifdef PY3
  wbuf_pygetbuf,			/* @bf_getbuffer@ */
  wbuf_pyrlsbuf				/* @bf_releasebuffer@ */
#else
  wbuf_pyreadbuf,			/* @bf_getreadbuffer@ */
  0,					/* @bf_getwritebuffer@ */
  wbuf_pysegcount,			/* @bf_getsegcount@ */
  0					/* @bf_getcharbuffer@ */
#endif
};

static const PyTypeObject wbuf_pytype_skel = {
  PyVarObject_HEAD_INIT(0, 0)		/* Header */
  "WriteBuffer",			/* @tp_name@ */
  sizeof(buf_pyobj),			/* @tp_basicsize@ */
  0,					/* @tp_itemsize@ */

  buf_pydealloc,			/* @tp_dealloc@ */
  0,					/* @tp_print@ */
  0,					/* @tp_getattr@ */
  0,					/* @tp_setattr@ */
  0,					/* @tp_compare@ */
  0,					/* @tp_repr@ */
  0,					/* @tp_as_number@ */
  0,					/* @tp_as_sequence@ */
  0,					/* @tp_as_mapping@ */
  0,					/* @tp_hash@ */
  0,					/* @tp_call@ */
  0,					/* @tp_str@ */
  0,					/* @tp_getattro@ */
  0,					/* @tp_setattro@ */
  PYBUFFER(wbuf),			/* @tp_as_buffer@ */
  Py_TPFLAGS_DEFAULT |			/* @tp_flags@ */
    Py_TPFLAGS_BASETYPE,

  /* @tp_doc@ */
  "WriteBuffer([size = ?]): a write buffer.",

  0,					/* @tp_traverse@ */
  0,					/* @tp_clear@ */
  0,					/* @tp_richcompare@ */
  0,					/* @tp_weaklistoffset@ */
  0,					/* @tp_iter@ */
  0,					/* @tp_iternext@ */
  PYMETHODS(wbuf),			/* @tp_methods@ */
  0,					/* @tp_members@ */
  PYGETSET(wbuf),			/* @tp_getset@ */
  0,					/* @tp_base@ */
  0,					/* @tp_dict@ */
  0,					/* @tp_descr_get@ */
  0,					/* @tp_descr_set@ */
  0,					/* @tp_dictoffset@ */
  0,					/* @tp_init@ */
  PyType_GenericAlloc,			/* @tp_alloc@ */
  wbuf_pynew,				/* @tp_new@ */
  0,					/* @tp_free@ */
  0					/* @tp_is_gc@ */
};

/*----- Initialization ----------------------------------------------------*/

PyObject *buferr;

void buffer_pyinit(void)
{
  INITTYPE(rbuf, root);
  INITTYPE(wbuf, root);
}

void buffer_pyinsert(PyObject *mod)
{
  INSEXC("BufferError", buferr, PyExc_Exception, 0);
  INSERT("ReadBuffer", rbuf_pytype);
  INSERT("WriteBuffer", wbuf_pytype);
}

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