[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"

/*----- Data structures ---------------------------------------------------*/

typedef struct buf_pyobj {
  PyObject_HEAD
  buf b;
  PyObject *sub;
  unsigned lk;
} buf_pyobj;

static PyTypeObject *rbuf_pytype, *wbuf_pytype;
#define RBUF_PYCHECK(o) PyObject_TypeCheck((o), rbuf_pytype)
#define WBUF_PYCHECK(o) PyObject_TypeCheck((o), wbuf_pytype)
#define BUF_B(o) (&((buf_pyobj *)(o))->b)
#define BUF_SUB(o) (((buf_pyobj *)(o))->sub)
#define BUF_LK(o) (((buf_pyobj *)(o))->lk)

/*----- Exceptions --------------------------------------------------------*/

static PyObject *buferr;

#define BUFERR(str) do { PyErr_SetString(buferr, str); goto end; } while (0)

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

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);
}

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))); }

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_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")
  METH	(getge,		"RBUF.getge(GROUP) -> X")
  METH	(getgeraw,	"RBUF.getgeraw(GROUP) -> X")
#undef METHNAME
  { 0 }
};

static const PyBufferProcs rbuf_pybuffer = {
  rbuf_pyreadbuf,			/* @bf_getreadbuffer@ */
  0,					/* @bf_getwritebuffer@ */
  rbuf_pysegcount,			/* @bf_getsegcount@ */
  0					/* @bf_getcharbuffer@ */
};

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 -----------------------------------------------------*/

static int ensure(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);
}

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))); }

static PyObject *wbmeth_zero(PyObject *me, PyObject *arg)
{
  void *p;
  size_t n;
  if (!PyArg_ParseTuple(arg, "O&:zero", convszt, &n)) return (0);
  if (ensure(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 (ensure(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 (ensure(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 (ensure(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 (ensure(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 (ensure(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 (ensure(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 pt = EC_INIT;
  if (!PyArg_ParseTuple(arg, "O!:putecptraw", ecptcurve_pytype, &ptobj))
    return (0);
  EC_OUT(ECPT_C(ptobj), &pt, ECPT_P(ptobj));
  if (ensure(me, ECPT_C(ptobj)->f->noctets * 2 + 1)) return (0);
  ec_putraw(ECPT_C(ptobj), BUF_B(me), &pt); assert(BOK(BUF_B(me)));
  EC_DESTROY(&pt);
  RETURN_ME;
}

static PyObject *wbmeth_putge(PyObject *me, PyObject *arg)
{
  PyObject *geobj;
  if (!PyArg_ParseTuple(arg, "O!:putge", ge_pytype, &geobj)) return (0);
  if (ensure(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 (ensure(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)")
  METH	(putge,		"WBUF.putge(X)")
  METH	(putgeraw,	"WBUF.putgeraw(X)")
#undef METHNAME
  { 0 }
};

static const PyBufferProcs wbuf_pybuffer = {
  wbuf_pyreadbuf,			/* @bf_getreadbuffer@ */
  0,					/* @bf_getwritebuffer@ */
  wbuf_pysegcount,			/* @bf_getsegcount@ */
  0					/* @bf_getcharbuffer@ */
};

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 ----------------------------------------------------*/

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 -------------------------------------------------*/
Commit	Line	Data
46e6ad89	1	/* --c--
46e6ad89	2	*
	3	* Reading and writing buffers of stuff
	4	*
	5	* (c) 2005 Straylight/Edgeware
	6	*/
	7
b2687a0a	8	/----- Licensing notice --------------------------------------------------
46e6ad89	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.
b2687a0a	16	*
46e6ad89	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.
b2687a0a	21	*
46e6ad89	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;
0463996f	36	PyObject *sub;
1d460442	37	unsigned lk;
46e6ad89	38	} buf_pyobj;
	39
	40	static PyTypeObject rbuf_pytype, wbuf_pytype;
	41	#define RBUF_PYCHECK(o) PyObject_TypeCheck((o), rbuf_pytype)
	42	#define WBUF_PYCHECK(o) PyObject_TypeCheck((o), wbuf_pytype)
	43	#define BUF_B(o) (&((buf_pyobj *)(o))->b)
0463996f	44	#define BUF_SUB(o) (((buf_pyobj *)(o))->sub)
1d460442	45	#define BUF_LK(o) (((buf_pyobj *)(o))->lk)
46e6ad89	46
	47	/----- Exceptions --------------------------------------------------------/
	48
	49	static PyObject *buferr;
	50
326f6eb0	51	#define BUFERR(str) do { PyErr_SetString(buferr, str); goto end; } while (0)
46e6ad89	52
	53	/----- Read buffers ------------------------------------------------------/
	54
	55	static PyObject rbuf_pynew(PyTypeObject ty, PyObject arg, PyObject kw)
	56	{
be17c8c2 MW	57	struct bin in;
be17c8c2 MW	58	void *q;
46e6ad89	59	buf_pyobj *me = 0;
827f89d7	60	static const char *const kwlist[] = { "data", 0 };
46e6ad89	61
be17c8c2	62	if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&:new", KWLIST, convbin, &in))
46e6ad89	63	goto end;
be17c8c2 MW	64	q = xmalloc(in.sz);
be17c8c2 MW	65	memcpy(q, in.p, in.sz);
0463996f	66	me = (buf_pyobj *)ty->tp_alloc(ty, 0);
1d460442	67	me->sub = 0; me->lk = 0;
be17c8c2	68	buf_init(&me->b, q, in.sz);
46e6ad89	69	end:
	70	return ((PyObject *)me);
	71	}
	72
	73	static void buf_pydealloc(PyObject *me)
0463996f	74	{
1d460442 MW	75	assert(!BUF_LK(me));
	76	if (BUF_SUB(me)) Py_DECREF(BUF_SUB(me));
	77	else xfree(BBASE(BUF_B(me)));
0463996f	78	FREEOBJ(me);
0463996f	79	}
46e6ad89	80
3d8f5f7c	81	static Py_ssize_t rbuf_pysegcount(PyObject me, Py_ssize_t nn)
46e6ad89	82	{ if (nn) *nn = BSZ(BUF_B(me)); return (1); }
46e6ad89	83
3d8f5f7c	84	static Py_ssize_t rbuf_pyreadbuf(PyObject me, Py_ssize_t seg, void *q)
f368b46e	85	{ assert(seg == 0); *q = BCUR(BUF_B(me)); return (BLEFT(BUF_B(me))); }
46e6ad89	86
	87	static PyObject rbmeth_skip(PyObject me, PyObject *arg)
	88	{
	89	size_t n;
	90
	91	if (!PyArg_ParseTuple(arg, "O&:skip", convszt, &n)) goto end;
326f6eb0	92	if (!buf_get(BUF_B(me), n)) BUFERR("buffer exhausted");
46e6ad89	93	RETURN_ME;
	94	end:
	95	return (0);
	96	}
	97
	98	static PyObject rbmeth_get(PyObject me, PyObject *arg)
	99	{
	100	void *p;
	101	size_t n;
	102
	103	if (!PyArg_ParseTuple(arg, "O&:get", convszt, &n)) goto end;
326f6eb0	104	if ((p = buf_get(BUF_B(me), n)) == 0) BUFERR("buffer exhausted");
46e6ad89	105	return (bytestring_pywrap(p, n));
	106	end:
	107	return (0);
	108	}
	109
	110	#define RBMETH_GETU_(n, W, w) \
7a75bb76	111	static PyObject rbmeth_getu##w(PyObject me) \
46e6ad89	112	{ \
46e6ad89	113	uint##n x; \
326f6eb0	114	if (buf_getu##w(BUF_B(me), &x)) BUFERR("buffer exhausted"); \
2da7a9c0 MW	115	if (MASK##W <= ULONG_MAX) return (getulong(x)); \
2da7a9c0 MW	116	else { kludge64 y; ASSIGN64(y, x); return (getk64(y)); } \
46e6ad89	117	end: \
	118	return (0); \
	119	}
	120	DOUINTCONV(RBMETH_GETU_)
	121
	122	#define RBMETH_GETBLK_(n, W, w) \
7a75bb76	123	static PyObject rbmeth_getblk##w(PyObject me) \
46e6ad89	124	{ \
	125	size_t sz; \
	126	char *q; \
326f6eb0 MW	127	if ((q = buf_getmem##w(BUF_B(me), &sz)) == 0) \
326f6eb0 MW	128	BUFERR("buffer exhausted"); \
46e6ad89	129	return (bytestring_pywrap(q, sz)); \
	130	end: \
	131	return (0); \
	132	}
	133	BUF_DOSUFFIXES(RBMETH_GETBLK_)
	134
0463996f	135	#define RBMETH_GETBUF_(n, W, w) \
7a75bb76	136	static PyObject rbmeth_getbuf##w(PyObject me) \
0463996f	137	{ \
	138	buf_pyobj *b; \
	139	buf bb; \
326f6eb0	140	if (buf_getbuf##w(BUF_B(me), &bb)) BUFERR("buffer exhausted"); \
0463996f	141	b = PyObject_NEW(buf_pyobj, rbuf_pytype); \
	142	b->b = bb; \
	143	b->sub = me; \
1d460442	144	b->lk = 0; \
0463996f	145	Py_INCREF(me); \
	146	return ((PyObject *)b); \
	147	end: \
	148	return (0); \
	149	}
	150	BUF_DOSUFFIXES(RBMETH_GETBUF_)
	151
7a75bb76	152	static PyObject rbmeth_getmp(PyObject me)
46e6ad89	153	{
46e6ad89	154	mp *x;
326f6eb0	155	if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR("buffer exhausted");
46e6ad89	156	return (mp_pywrap(x));
	157	end:
	158	return (0);
	159	}
	160
7a75bb76	161	static PyObject rbmeth_getgf(PyObject me)
46e6ad89	162	{
46e6ad89	163	mp *x;
326f6eb0	164	if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR("buffer exhausted");
46e6ad89	165	return (gf_pywrap(x));
	166	end:
	167	return (0);
	168	}
	169
	170	static PyObject rbmeth_getecpt(PyObject me, PyObject arg, PyObject kw)
	171	{
	172	PyObject *cobj = Py_None;
827f89d7	173	static const char *const kwlist[] = { "curve", 0 };
46e6ad89	174	ec pt = EC_INIT;
827f89d7	175	if (!PyArg_ParseTupleAndKeywords(arg, kw, "\|O:getecpt", KWLIST, &cobj))
46e6ad89	176	goto end;
	177	if (cobj == Py_None) cobj = (PyObject *)ecpt_pytype;
	178	if (!PyType_Check(cobj) \|\|
	179	!PyType_IsSubtype((PyTypeObject *)cobj, ecpt_pytype))
	180	TYERR("expected elliptic curve type");
326f6eb0	181	if (buf_getec(BUF_B(me), &pt)) BUFERR("buffer exhausted");
46e6ad89	182	return (ecpt_pywrapout(cobj, &pt));
	183	end:
	184	return (0);
	185	}
b2687a0a	186
46e6ad89	187	static PyObject rbmeth_getecptraw(PyObject me, PyObject *arg)
46e6ad89	188	{
5b1ef02a	189	PyObject *cobj;
46e6ad89	190	ec pt = EC_INIT;
45fb29bc	191	PyObject *rc = 0;
46e6ad89	192	if (!PyArg_ParseTuple(arg, "O!:getecptraw", eccurve_pytype, &cobj))
46e6ad89	193	goto end;
326f6eb0	194	if (ec_getraw(ECCURVE_C(cobj), BUF_B(me), &pt)) BUFERR("buffer exhausted");
45fb29bc	195	rc = ecpt_pywrapout(cobj, &pt);
46e6ad89	196	end:
45fb29bc	197	return (rc);
46e6ad89	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));
326f6eb0	206	if (G_FROMBUF(GROUP_G(gobj), BUF_B(me), x)) BUFERR("buffer exhausted");
46e6ad89	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));
326f6eb0	219	if (G_FROMRAW(GROUP_G(gobj), BUF_B(me), x)) BUFERR("buffer exhausted");
46e6ad89	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)))); }
0463996f	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;
f368b46e	237	if (!x) NIERR("__del__");
0463996f	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	}
46e6ad89	245
637b9140	246	static const PyGetSetDef rbuf_pygetset[] = {
46e6ad89	247	#define GETSETNAME(op, name) rb##op##_##name
ef783f91 MW	248	GET (size, "RBUF.size -> SIZE")
	249	GET (left, "RBUF.left -> REMAINDER")
	250	GET (endp, "RBUF.endp -> BOOL")
	251	GETSET(offset, "RBUF.offset -> OFFSET")
46e6ad89	252	#undef GETSETNAME
	253	{ 0 }
	254	};
	255
637b9140	256	static const PyMethodDef rbuf_pymethods[] = {
46e6ad89	257	#define METHNAME(func) rbmeth_##func
ef783f91 MW	258	METH (skip, "RBUF.skip(N)")
ef783f91 MW	259	METH (get, "RBUF.get(N) -> BYTES")
46e6ad89	260	#define RBMETH_DECL_GETU_(n, W, w) \
7a75bb76	261	NAMETH(getu##w, "RBUF.getu" #w "() -> INT")
46e6ad89	262	DOUINTCONV(RBMETH_DECL_GETU_)
46e6ad89	263	#define RBMETH_DECL_GETBLK_(n, W, w) \
7a75bb76	264	NAMETH(getblk##w, "RBUF.getblk" #w "() -> BYTES")
46e6ad89	265	BUF_DOSUFFIXES(RBMETH_DECL_GETBLK_)
0463996f	266	#define RBMETH_DECL_GETBUF_(n, W, w) \
7a75bb76	267	NAMETH(getbuf##w, "RBUF.getbuf" #w "() -> RBUF'")
0463996f	268	BUF_DOSUFFIXES(RBMETH_DECL_GETBUF_)
7a75bb76 MW	269	NAMETH(getmp, "RBUF.getmp() -> X")
7a75bb76 MW	270	NAMETH(getgf, "RBUF.getgf() -> X")
ef783f91 MW	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")
46e6ad89	275	#undef METHNAME
	276	{ 0 }
	277	};
	278
637b9140	279	static const PyBufferProcs rbuf_pybuffer = {
46e6ad89	280	rbuf_pyreadbuf, /* @bf_getreadbuffer@ */
	281	0, /* @bf_getwritebuffer@ */
	282	rbuf_pysegcount, /* @bf_getsegcount@ */
	283	0 /* @bf_getcharbuffer@ */
	284	};
	285
ddd4720b	286	static const PyTypeObject rbuf_pytype_skel = {
4648f560	287	PyVarObject_HEAD_INIT(0, 0) /* Header */
c461c9b3	288	"ReadBuffer", /* @tp_name@ */
46e6ad89	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@ */
637b9140	306	PYBUFFER(rbuf), /* @tp_as_buffer@ */
46e6ad89	307	Py_TPFLAGS_DEFAULT \| /* @tp_flags@ */
	308	Py_TPFLAGS_BASETYPE,
	309
	310	/* @tp_doc@ */
ef783f91	311	"ReadBuffer(STR): a read buffer.",
46e6ad89	312
	313	0, /* @tp_traverse@ */
	314	0, /* @tp_clear@ */
	315	0, /* @tp_richcompare@ */
	316	0, /* @tp_weaklistoffset@ */
	317	0, /* @tp_iter@ */
963a6148	318	0, /* @tp_iternext@ */
637b9140	319	PYMETHODS(rbuf), /* @tp_methods@ */
46e6ad89	320	0, /* @tp_members@ */
637b9140	321	PYGETSET(rbuf), /* @tp_getset@ */
46e6ad89	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
1d460442	336	static int ensure(PyObject *me, size_t n)
46e6ad89	337	{
46e6ad89	338	buf *b = BUF_B(me);
1d460442 MW	339	size_t nn = BSZ(b);
	340	octet *p;
	341	size_t want = BLEN(b) + n;
46e6ad89	342
1d460442 MW	343	if (BLEFT(b) >= n)
	344	return (0);
	345	else if (BUF_LK(me))
	346	BUFERR("buffer locked");
	347	else {
46e6ad89	348	while (nn < want) nn <<= 1;
	349	p = xrealloc(BBASE(b), nn, BSZ(b));
	350	BCUR(b) = p + BLEN(b);
	351	BLIM(b) = p + nn;
	352	BBASE(b) = p;
1d460442	353	return (0);
46e6ad89	354	}
1d460442 MW	355	end:
1d460442 MW	356	return (-1);
46e6ad89	357	}
	358
	359	static PyObject wbuf_pynew(PyTypeObject ty, PyObject arg, PyObject kw)
	360	{
	361	char *p;
	362	size_t n = 64;
	363	buf_pyobj *me = 0;
827f89d7	364	static const char *const kwlist[] = { "size", 0 };
46e6ad89	365
827f89d7	366	if (!PyArg_ParseTupleAndKeywords(arg, kw, "\|O&:new", KWLIST,
46e6ad89	367	convszt, &n))
	368	goto end;
	369	me = (buf_pyobj *)ty->tp_alloc(ty, 0);
	370	p = xmalloc(n);
1d460442	371	me->sub = 0; me->lk = 0;
46e6ad89	372	buf_init(&me->b, p, n);
	373	end:
	374	return ((PyObject *)me);
	375	}
	376
3d8f5f7c	377	static Py_ssize_t wbuf_pysegcount(PyObject me, Py_ssize_t nn)
46e6ad89	378	{ if (nn) *nn = BLEN(BUF_B(me)); return (1); }
46e6ad89	379
3d8f5f7c	380	static Py_ssize_t wbuf_pyreadbuf(PyObject me, Py_ssize_t seg, void *q)
46e6ad89	381	{ assert(seg == 0); *q = BBASE(BUF_B(me)); return (BLEN(BUF_B(me))); }
	382
	383	static PyObject wbmeth_zero(PyObject me, PyObject *arg)
	384	{
	385	void *p;
	386	size_t n;
	387	if (!PyArg_ParseTuple(arg, "O&:zero", convszt, &n)) return (0);
1d460442	388	if (ensure(me, n)) return (0);
46e6ad89	389	p = buf_get(BUF_B(me), n); assert(p && BOK(BUF_B(me)));
	390	memset(p, 0, n);
	391	RETURN_ME;
	392	}
	393
	394	static PyObject wbmeth_put(PyObject me, PyObject *arg)
	395	{
be17c8c2 MW	396	struct bin in;
be17c8c2 MW	397	if (!PyArg_ParseTuple(arg, "O&:put", convbin, &in)) return (0);
1d460442	398	if (ensure(me, in.sz)) return (0);
be17c8c2	399	buf_put(BUF_B(me), in.p, in.sz); assert(BOK(BUF_B(me)));
46e6ad89	400	RETURN_ME;
	401	}
	402
	403	#define WBMETH_PUTU_(n, W, w) \
	404	static PyObject wbmeth_putu##w(PyObject me, PyObject *arg) \
	405	{ \
	406	uint##n i; \
	407	if (!PyArg_ParseTuple(arg, "O&:putu" #w, convu##n, &i)) return (0); \
1d460442	408	if (ensure(me, SZ_##n)) return (0); \
46e6ad89	409	buf_putu##w(BUF_B(me), i); assert(BOK(BUF_B(me))); \
	410	RETURN_ME; \
	411	}
	412	DOUINTCONV(WBMETH_PUTU_)
	413
9fa70ff7	414	#define MASKz 0
46e6ad89	415	#define SZ_z 1
	416	#define WBMETH_PUTBLK_(n, W, w) \
	417	static PyObject wbmeth_putblk##w(PyObject me, PyObject *arg) \
	418	{ \
be17c8c2 MW	419	struct bin in; \
	420	if (!PyArg_ParseTuple(arg, "O&:putblk" #w, convbin, &in)) goto end; \
	421	if (MASK##W && in.sz > MASK##W) VALERR("too large"); \
1d460442	422	if (ensure(me, in.sz + SZ_##n)) return (0); \
be17c8c2	423	buf_putmem##w(BUF_B(me), in.p, in.sz); assert(BOK(BUF_B(me))); \
46e6ad89	424	RETURN_ME; \
9fa70ff7 MW	425	end: \
9fa70ff7 MW	426	return (0); \
46e6ad89	427	}
	428	BUF_DOSUFFIXES(WBMETH_PUTBLK_)
	429
	430	static PyObject wbmeth_putmp(PyObject me, PyObject *arg)
	431	{
	432	mp *x = 0;
	433	if (!PyArg_ParseTuple(arg, "O&:putmp", convmp, &x)) return (0);
1d460442	434	if (ensure(me, mp_octets(x) + 2)) return (0);
46e6ad89	435	buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
	436	RETURN_ME;
	437	}
	438
	439	static PyObject wbmeth_putgf(PyObject me, PyObject *arg)
	440	{
	441	mp *x = 0;
	442	if (!PyArg_ParseTuple(arg, "O&:putgf", convgf, &x)) return (0);
1d460442	443	if (ensure(me, mp_octets(x) + 2)) return (0);
46e6ad89	444	buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
	445	MP_DROP(x);
	446	RETURN_ME;
	447	}
	448
	449	static PyObject wbmeth_putecpt(PyObject me, PyObject *arg)
	450	{
	451	ec pt = EC_INIT;
	452	if (!PyArg_ParseTuple(arg, "O&:putecpt", convecpt, &pt)) return (0);
1d460442 MW	453	if (ensure(me, EC_ATINF(&pt) ? 2 : 6 + mp_octets(pt.x) + mp_octets(pt.y)))
1d460442 MW	454	return (0);
46e6ad89	455	buf_putec(BUF_B(me), &pt); assert(BOK(BUF_B(me)));
	456	EC_DESTROY(&pt);
	457	RETURN_ME;
	458	}
	459
	460	static PyObject wbmeth_putecptraw(PyObject me, PyObject *arg)
	461	{
	462	PyObject *ptobj;
	463	ec pt = EC_INIT;
	464	if (!PyArg_ParseTuple(arg, "O!:putecptraw", ecptcurve_pytype, &ptobj))
	465	return (0);
	466	EC_OUT(ECPT_C(ptobj), &pt, ECPT_P(ptobj));
1d460442	467	if (ensure(me, ECPT_C(ptobj)->f->noctets * 2 + 1)) return (0);
46e6ad89	468	ec_putraw(ECPT_C(ptobj), BUF_B(me), &pt); assert(BOK(BUF_B(me)));
	469	EC_DESTROY(&pt);
	470	RETURN_ME;
	471	}
	472
	473	static PyObject wbmeth_putge(PyObject me, PyObject *arg)
	474	{
	475	PyObject *geobj;
	476	if (!PyArg_ParseTuple(arg, "O!:putge", ge_pytype, &geobj)) return (0);
1d460442	477	if (ensure(me, GE_G(geobj)->noctets)) return (0);
46e6ad89	478	G_TOBUF(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
	479	RETURN_ME;
	480	}
	481
	482	static PyObject wbmeth_putgeraw(PyObject me, PyObject *arg)
	483	{
	484	PyObject *geobj;
	485	if (!PyArg_ParseTuple(arg, "O!:putgeraw", ge_pytype, &geobj)) return (0);
1d460442	486	if (ensure(me, GE_G(geobj)->noctets)) return (0);
46e6ad89	487	G_TORAW(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
	488	RETURN_ME;
	489	}
	490
	491	static PyObject wbget_size(PyObject me, void *hunoz)
	492	{ return (PyInt_FromLong(BLEN(BUF_B(me)))); }
	493
0051d10f MW	494	static PyObject wbget_contents(PyObject me, void *hunoz)
	495	{ return (bytestring_pywrap(BBASE(BUF_B(me)), BLEN(BUF_B(me)))); }
	496
637b9140	497	static const PyGetSetDef wbuf_pygetset[] = {
46e6ad89	498	#define GETSETNAME(op, name) wb##op##_##name
ef783f91 MW	499	GET (size, "WBUF.size -> SIZE")
ef783f91 MW	500	GET (contents, "WBUF.contents -> STR")
46e6ad89	501	#undef GETSETNAME
	502	{ 0 }
	503	};
	504
637b9140	505	static const PyMethodDef wbuf_pymethods[] = {
46e6ad89	506	#define METHNAME(func) wbmeth_##func
ef783f91 MW	507	METH (zero, "WBUF.zero(N)")
ef783f91 MW	508	METH (put, "WBUF.put(BYTES)")
46e6ad89	509	#define WBMETH_DECL_PUTU_(n, W, w) \
ef783f91	510	METH(putu##w, "WBUF.putu" #w "(INT)")
46e6ad89	511	DOUINTCONV(WBMETH_DECL_PUTU_)
46e6ad89	512	#define WBMETH_DECL_PUTBLK_(n, W, w) \
ef783f91	513	METH(putblk##w, "WBUF.putblk" #w "(BYTES)")
46e6ad89	514	BUF_DOSUFFIXES(WBMETH_DECL_PUTBLK_)
ef783f91 MW	515	METH (putmp, "WBUF.putmp(X)")
	516	METH (putgf, "WBUF.putgf(X)")
	517	METH (putecpt, "WBUF.putecpt(P)")
	518	METH (putecptraw, "WBUF.putecptraw(P)")
	519	METH (putge, "WBUF.putge(X)")
	520	METH (putgeraw, "WBUF.putgeraw(X)")
46e6ad89	521	#undef METHNAME
	522	{ 0 }
	523	};
	524
637b9140	525	static const PyBufferProcs wbuf_pybuffer = {
46e6ad89	526	wbuf_pyreadbuf, /* @bf_getreadbuffer@ */
	527	0, /* @bf_getwritebuffer@ */
	528	wbuf_pysegcount, /* @bf_getsegcount@ */
	529	0 /* @bf_getcharbuffer@ */
	530	};
	531
ddd4720b	532	static const PyTypeObject wbuf_pytype_skel = {
4648f560	533	PyVarObject_HEAD_INIT(0, 0) /* Header */
c461c9b3	534	"WriteBuffer", /* @tp_name@ */
46e6ad89	535	sizeof(buf_pyobj), /* @tp_basicsize@ */
	536	0, /* @tp_itemsize@ */
	537
	538	buf_pydealloc, /* @tp_dealloc@ */
	539	0, /* @tp_print@ */
	540	0, /* @tp_getattr@ */
	541	0, /* @tp_setattr@ */
	542	0, /* @tp_compare@ */
	543	0, /* @tp_repr@ */
	544	0, /* @tp_as_number@ */
	545	0, /* @tp_as_sequence@ */
	546	0, /* @tp_as_mapping@ */
	547	0, /* @tp_hash@ */
	548	0, /* @tp_call@ */
	549	0, /* @tp_str@ */
	550	0, /* @tp_getattro@ */
	551	0, /* @tp_setattro@ */
637b9140	552	PYBUFFER(wbuf), /* @tp_as_buffer@ */
46e6ad89	553	Py_TPFLAGS_DEFAULT \| /* @tp_flags@ */
	554	Py_TPFLAGS_BASETYPE,
	555
	556	/* @tp_doc@ */
ef783f91	557	"WriteBuffer([size = ?]): a write buffer.",
46e6ad89	558
	559	0, /* @tp_traverse@ */
	560	0, /* @tp_clear@ */
	561	0, /* @tp_richcompare@ */
	562	0, /* @tp_weaklistoffset@ */
	563	0, /* @tp_iter@ */
963a6148	564	0, /* @tp_iternext@ */
637b9140	565	PYMETHODS(wbuf), /* @tp_methods@ */
46e6ad89	566	0, /* @tp_members@ */
637b9140	567	PYGETSET(wbuf), /* @tp_getset@ */
46e6ad89	568	0, /* @tp_base@ */
	569	0, /* @tp_dict@ */
	570	0, /* @tp_descr_get@ */
	571	0, /* @tp_descr_set@ */
	572	0, /* @tp_dictoffset@ */
	573	0, /* @tp_init@ */
	574	PyType_GenericAlloc, /* @tp_alloc@ */
	575	wbuf_pynew, /* @tp_new@ */
	576	0, /* @tp_free@ */
	577	0 /* @tp_is_gc@ */
	578	};
	579
	580	/----- Initialization ----------------------------------------------------/
	581
	582	void buffer_pyinit(void)
	583	{
	584	INITTYPE(rbuf, root);
	585	INITTYPE(wbuf, root);
	586	}
	587
	588	void buffer_pyinsert(PyObject *mod)
	589	{
	590	INSEXC("BufferError", buferr, PyExc_Exception, 0);
	591	INSERT("ReadBuffer", rbuf_pytype);
	592	INSERT("WriteBuffer", wbuf_pytype);
	593	}
	594
	595	/----- That's all, folks -------------------------------------------------/