[catacomb-python] / buffer.c

/* -*-c-*-
 *
 * $Id$
 *
 * 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;
} 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)

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

static PyObject *buferr;

#define BUFERR() do { PyErr_SetNone(buferr); goto end; } while (0)

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

static PyObject *rbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
{
  char *p, *q;
  int n;
  buf_pyobj *me = 0;
  static char *kwlist[] = { "data", 0 };

  if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", kwlist, &p, &n))
    goto end;
  q = xmalloc(n);
  memcpy(q, p, n);
  me = (buf_pyobj *)ty->tp_alloc(ty, 0);
  me->sub = 0;
  buf_init(&me->b, q, n);
end:
  return ((PyObject *)me);
}

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

static int rbuf_pysegcount(PyObject *me, int *nn)
  { if (nn) *nn = BSZ(BUF_B(me)); return (1); }

static int rbuf_pyreadbuf(PyObject *me, int seg, void **q)
  { assert(seg == 0); *q = BBASE(BUF_B(me)); return (BSZ(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();
  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();
  return (bytestring_pywrap(p, n));
end:
  return (0);
}

#define RBMETH_GETU_(n, W, w)						\
  static PyObject *rbmeth_getu##w(PyObject *me, PyObject *arg)		\
  {									\
    uint##n x;								\
    if (!PyArg_ParseTuple(arg, ":getu" #w)) goto end;			\
    if (buf_getu##w(BUF_B(me), &x)) BUFERR();				\
    return (getu32(x));							\
  end:									\
    return (0);								\
  }
DOUINTCONV(RBMETH_GETU_)

#define RBMETH_GETBLK_(n, W, w)						\
  static PyObject *rbmeth_getblk##w(PyObject *me, PyObject *arg)	\
  {									\
    size_t sz;								\
    char *q;								\
    if (!PyArg_ParseTuple(arg, ":getblk" #w)) goto end;			\
    if ((q = buf_getmem##w(BUF_B(me), &sz)) == 0) BUFERR();		\
    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, PyObject *arg)	\
  {									\
    buf_pyobj *b;							\
    buf bb;								\
    if (!PyArg_ParseTuple(arg, ":getbuf" #w)) goto end;			\
    if (buf_getbuf##w(BUF_B(me), &bb)) BUFERR();			\
    b = PyObject_NEW(buf_pyobj, rbuf_pytype);				\
    b->b = bb;								\
    b->sub = me;							\
    Py_INCREF(me);							\
    return ((PyObject *)b);						\
  end:									\
    return (0);								\
  }
BUF_DOSUFFIXES(RBMETH_GETBUF_)

static PyObject *rbmeth_getmp(PyObject *me, PyObject *arg)
{
  mp *x;
  if (!PyArg_ParseTuple(arg, ":getmp")) goto end;
  if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR();
  return (mp_pywrap(x));
end:
  return (0);
}

static PyObject *rbmeth_getgf(PyObject *me, PyObject *arg)
{
  mp *x;
  if (!PyArg_ParseTuple(arg, ":getgf")) goto end;
  if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR();
  return (gf_pywrap(x));
end:
  return (0);
}

static PyObject *rbmeth_getecpt(PyObject *me, PyObject *arg, PyObject *kw)
{
  PyObject *cobj = Py_None;
  static char *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();
  return (ecpt_pywrapout(cobj, &pt));
end:
  return (0);
}
    
static PyObject *rbmeth_getecptraw(PyObject *me, PyObject *arg)
{
  PyTypeObject *cobj = ecpt_pytype;
  ec pt = EC_INIT;
  if (!PyArg_ParseTuple(arg, "O!:getecptraw", eccurve_pytype, &cobj))
    goto end;
  if (ec_getraw(ECCURVE_C(cobj), BUF_B(me), &pt)) BUFERR();
  return (ecpt_pywrapout(cobj, &pt));
end:
  return (0);
}

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();
  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();
  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 (!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 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 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)					\
    METH(getu##w, "RBUF.getu" #w "() -> INT")
  DOUINTCONV(RBMETH_DECL_GETU_)
#define RBMETH_DECL_GETBLK_(n, W, w)					\
    METH(getblk##w, "RBUF.getblk" #w "() -> INT")
  BUF_DOSUFFIXES(RBMETH_DECL_GETBLK_)
#define RBMETH_DECL_GETBUF_(n, W, w)					\
    METH(getbuf##w, "RBUF.getbuf" #w "() -> INT")
  BUF_DOSUFFIXES(RBMETH_DECL_GETBUF_)
  METH	(getmp,			"RBUF.getmp() -> X")
  METH	(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 PyBufferProcs rbuf_pybuffer = {
  rbuf_pyreadbuf,			/* @bf_getreadbuffer@ */
  0,					/* @bf_getwritebuffer@ */
  rbuf_pysegcount,			/* @bf_getsegcount@ */
  0					/* @bf_getcharbuffer@ */
};

static PyTypeObject rbuf_pytype_skel = {
  PyObject_HEAD_INIT(0) 0,		/* Header */
  "catacomb.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@ */
  &rbuf_pybuffer,			/* @tp_as_buffer@ */
  Py_TPFLAGS_DEFAULT |			/* @tp_flags@ */
    Py_TPFLAGS_BASETYPE,

  /* @tp_doc@ */
  "A read buffer.",

  0,					/* @tp_traverse@ */
  0,					/* @tp_clear@ */
  0,					/* @tp_richcompare@ */
  0,					/* @tp_weaklistoffset@ */
  0,					/* @tp_iter@ */
  0,					/* @tp_iternext@ */
  rbuf_pymethods,			/* @tp_methods@ */
  0,					/* @tp_members@ */
  rbuf_pygetset,			/* @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 void ensure(PyObject *me, size_t n)
{
  buf *b = BUF_B(me);

  if (BLEFT(b) < n) {
    size_t nn = BSZ(b);
    octet *p;
    size_t want = BLEFT(b) + n;
    while (nn < want) nn <<= 1;
    p = xrealloc(BBASE(b), nn, BSZ(b));
    BCUR(b) = p + BLEN(b);
    BLIM(b) = p + nn;
    BBASE(b) = p;
  }
}

static PyObject *wbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
{
  char *p;
  size_t n = 64;
  buf_pyobj *me = 0;
  static char *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;
  buf_init(&me->b, p, n);
end:
  return ((PyObject *)me);
}

static int wbuf_pysegcount(PyObject *me, int *nn)
  { if (nn) *nn = BLEN(BUF_B(me)); return (1); }

static int wbuf_pyreadbuf(PyObject *me, int 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);
  ensure(me, n);
  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)
{
  void *p;
  int n;
  if (!PyArg_ParseTuple(arg, "s#:put", &p, &n)) return (0);
  ensure(me, n);
  buf_put(BUF_B(me), p, n); assert(BOK(BUF_B(m)));
  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);	\
    ensure(me, SZ_##n);							\
    buf_putu##w(BUF_B(me), i); assert(BOK(BUF_B(me)));			\
    RETURN_ME;								\
  }
DOUINTCONV(WBMETH_PUTU_)

#define SZ_z 1
#define WBMETH_PUTBLK_(n, W, w)						\
  static PyObject *wbmeth_putblk##w(PyObject *me, PyObject *arg)	\
  {									\
    char *p;								\
    int sz;								\
    if (!PyArg_ParseTuple(arg, "s#:putblk" #w, &p, &sz)) return (0);	\
    ensure(me, sz + SZ_##n);						\
    buf_putmem##w(BUF_B(me), p, sz); assert(BOK(BUF_B(me)));		\
    RETURN_ME;								\
  }
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);
  ensure(me, mp_octets(x) + 2);
  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);
  ensure(me, mp_octets(x) + 2);
  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 (EC_ATINF(&pt)) ensure(me, 2);
  else ensure(me, 4 + mp_octets(pt.x) + mp_octets(pt.y));
  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));
  ensure(me, ECPT_C(ptobj)->f->noctets * 2 + 1);
  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);
  ensure(me, GE_G(geobj)->noctets);
  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);
  ensure(me, GE_G(geobj)->noctets);
  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 PyGetSetDef wbuf_pygetset[] = {
#define GETSETNAME(op, name) wb##op##_##name
  GET	(size,			"WBUF.size -> SIZE")
#undef GETSETNAME
  { 0 }
};

static PyMethodDef wbuf_pymethods[] = {
#define METHNAME(func) wbmeth_##func
  METH	(zero,			"WBUF.skip(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)")
  KWMETH(putecpt,		"WBUF.putecpt(P)")
  METH	(putecptraw,		"WBUF.putecptraw(P)")
  METH	(putge,			"WBUF.putge(X)")
  METH	(putgeraw,		"WBUF.putgeraw(X)")
#undef METHNAME
  { 0 }
};

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

static PyTypeObject wbuf_pytype_skel = {
  PyObject_HEAD_INIT(0) 0,		/* Header */
  "catacomb.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@ */
  &wbuf_pybuffer,			/* @tp_as_buffer@ */
  Py_TPFLAGS_DEFAULT |			/* @tp_flags@ */
    Py_TPFLAGS_BASETYPE,

  /* @tp_doc@ */
  "A write buffer.",

  0,					/* @tp_traverse@ */
  0,					/* @tp_clear@ */
  0,					/* @tp_richcompare@ */
  0,					/* @tp_weaklistoffset@ */
  0,					/* @tp_iter@ */
  0,					/* @tp_iternext@ */
  wbuf_pymethods,			/* @tp_methods@ */
  0,					/* @tp_members@ */
  wbuf_pygetset,			/* @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--
	2	*
	3	* $Id$
	4	*
	5	* Reading and writing buffers of stuff
	6	*
	7	* (c) 2005 Straylight/Edgeware
	8	*/
	9
	10	/----- Licensing notice --------------------------------------------------
	11	*
	12	* This file is part of the Python interface to Catacomb.
	13	*
	14	* Catacomb/Python is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2 of the License, or
	17	* (at your option) any later version.
	18	*
	19	* Catacomb/Python is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with Catacomb/Python; if not, write to the Free Software Foundation,
	26	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	27	*/
	28
	29	/----- Header files ------------------------------------------------------/
	30
	31	#include "catacomb-python.h"
	32
	33	/----- Data structures ---------------------------------------------------/
	34
	35	typedef struct buf_pyobj {
	36	PyObject_HEAD
	37	buf b;
0463996f	38	PyObject *sub;
46e6ad89	39	} buf_pyobj;
	40
	41	static PyTypeObject rbuf_pytype, wbuf_pytype;
	42	#define RBUF_PYCHECK(o) PyObject_TypeCheck((o), rbuf_pytype)
	43	#define WBUF_PYCHECK(o) PyObject_TypeCheck((o), wbuf_pytype)
	44	#define BUF_B(o) (&((buf_pyobj *)(o))->b)
0463996f	45	#define BUF_SUB(o) (((buf_pyobj *)(o))->sub)
46e6ad89	46
	47	/----- Exceptions --------------------------------------------------------/
	48
	49	static PyObject *buferr;
	50
	51	#define BUFERR() do { PyErr_SetNone(buferr); goto end; } while (0)
	52
	53	/----- Read buffers ------------------------------------------------------/
	54
	55	static PyObject rbuf_pynew(PyTypeObject ty, PyObject arg, PyObject kw)
	56	{
	57	char p, q;
	58	int n;
	59	buf_pyobj *me = 0;
	60	static char *kwlist[] = { "data", 0 };
	61
	62	if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", kwlist, &p, &n))
	63	goto end;
46e6ad89	64	q = xmalloc(n);
46e6ad89	65	memcpy(q, p, n);
0463996f	66	me = (buf_pyobj *)ty->tp_alloc(ty, 0);
0463996f	67	me->sub = 0;
46e6ad89	68	buf_init(&me->b, q, n);
	69	end:
	70	return ((PyObject *)me);
	71	}
	72
	73	static void buf_pydealloc(PyObject *me)
0463996f	74	{
	75	if (BUF_SUB(me))
	76	Py_DECREF(BUF_SUB(me));
	77	else
	78	xfree(BBASE(BUF_B(me)));
	79	FREEOBJ(me);
	80	}
46e6ad89	81
	82	static int rbuf_pysegcount(PyObject me, int nn)
	83	{ if (nn) *nn = BSZ(BUF_B(me)); return (1); }
	84
	85	static int rbuf_pyreadbuf(PyObject me, int seg, void *q)
	86	{ assert(seg == 0); *q = BBASE(BUF_B(me)); return (BSZ(BUF_B(me))); }
	87
	88	static PyObject rbmeth_skip(PyObject me, PyObject *arg)
	89	{
	90	size_t n;
	91
	92	if (!PyArg_ParseTuple(arg, "O&:skip", convszt, &n)) goto end;
	93	if (!buf_get(BUF_B(me), n)) BUFERR();
	94	RETURN_ME;
	95	end:
	96	return (0);
	97	}
	98
	99	static PyObject rbmeth_get(PyObject me, PyObject *arg)
	100	{
	101	void *p;
	102	size_t n;
	103
	104	if (!PyArg_ParseTuple(arg, "O&:get", convszt, &n)) goto end;
	105	if ((p = buf_get(BUF_B(me), n)) == 0) BUFERR();
	106	return (bytestring_pywrap(p, n));
	107	end:
	108	return (0);
	109	}
	110
	111	#define RBMETH_GETU_(n, W, w) \
	112	static PyObject rbmeth_getu##w(PyObject me, PyObject *arg) \
	113	{ \
	114	uint##n x; \
	115	if (!PyArg_ParseTuple(arg, ":getu" #w)) goto end; \
	116	if (buf_getu##w(BUF_B(me), &x)) BUFERR(); \
	117	return (getu32(x)); \
	118	end: \
	119	return (0); \
	120	}
	121	DOUINTCONV(RBMETH_GETU_)
	122
	123	#define RBMETH_GETBLK_(n, W, w) \
	124	static PyObject rbmeth_getblk##w(PyObject me, PyObject *arg) \
	125	{ \
	126	size_t sz; \
	127	char *q; \
	128	if (!PyArg_ParseTuple(arg, ":getblk" #w)) goto end; \
	129	if ((q = buf_getmem##w(BUF_B(me), &sz)) == 0) BUFERR(); \
	130	return (bytestring_pywrap(q, sz)); \
	131	end: \
	132	return (0); \
	133	}
	134	BUF_DOSUFFIXES(RBMETH_GETBLK_)
	135
0463996f	136	#define RBMETH_GETBUF_(n, W, w) \
	137	static PyObject rbmeth_getbuf##w(PyObject me, PyObject *arg) \
	138	{ \
	139	buf_pyobj *b; \
	140	buf bb; \
	141	if (!PyArg_ParseTuple(arg, ":getbuf" #w)) goto end; \
	142	if (buf_getbuf##w(BUF_B(me), &bb)) BUFERR(); \
	143	b = PyObject_NEW(buf_pyobj, rbuf_pytype); \
	144	b->b = bb; \
	145	b->sub = me; \
	146	Py_INCREF(me); \
	147	return ((PyObject *)b); \
	148	end: \
	149	return (0); \
	150	}
	151	BUF_DOSUFFIXES(RBMETH_GETBUF_)
	152
46e6ad89	153	static PyObject rbmeth_getmp(PyObject me, PyObject *arg)
	154	{
	155	mp *x;
	156	if (!PyArg_ParseTuple(arg, ":getmp")) goto end;
	157	if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR();
	158	return (mp_pywrap(x));
	159	end:
	160	return (0);
	161	}
	162
	163	static PyObject rbmeth_getgf(PyObject me, PyObject *arg)
	164	{
	165	mp *x;
	166	if (!PyArg_ParseTuple(arg, ":getgf")) goto end;
	167	if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR();
	168	return (gf_pywrap(x));
	169	end:
	170	return (0);
	171	}
	172
	173	static PyObject rbmeth_getecpt(PyObject me, PyObject arg, PyObject kw)
	174	{
	175	PyObject *cobj = Py_None;
	176	static char *kwlist[] = { "curve", 0 };
	177	ec pt = EC_INIT;
	178	if (!PyArg_ParseTupleAndKeywords(arg, kw, "\|O:getecpt", kwlist, &cobj))
	179	goto end;
	180	if (cobj == Py_None) cobj = (PyObject *)ecpt_pytype;
	181	if (!PyType_Check(cobj) \|\|
	182	!PyType_IsSubtype((PyTypeObject *)cobj, ecpt_pytype))
	183	TYERR("expected elliptic curve type");
	184	if (buf_getec(BUF_B(me), &pt)) BUFERR();
	185	return (ecpt_pywrapout(cobj, &pt));
	186	end:
	187	return (0);
	188	}
	189
	190	static PyObject rbmeth_getecptraw(PyObject me, PyObject *arg)
	191	{
	192	PyTypeObject *cobj = ecpt_pytype;
	193	ec pt = EC_INIT;
	194	if (!PyArg_ParseTuple(arg, "O!:getecptraw", eccurve_pytype, &cobj))
	195	goto end;
	196	if (ec_getraw(ECCURVE_C(cobj), BUF_B(me), &pt)) BUFERR();
	197	return (ecpt_pywrapout(cobj, &pt));
	198	end:
	199	return (0);
	200	}
	201
	202	static PyObject rbmeth_getge(PyObject me, PyObject *arg)
	203	{
	204	PyObject *gobj;
	205	ge *x = 0;
	206	if (!PyArg_ParseTuple(arg, "O!:getge", group_pytype, &gobj)) goto end;
	207	x = G_CREATE(GROUP_G(gobj));
	208	if (G_FROMBUF(GROUP_G(gobj), BUF_B(me), x)) BUFERR();
	209	return (ge_pywrap(gobj, x));
	210	end:
	211	if (x) G_DESTROY(GROUP_G(gobj), x);
	212	return (0);
	213	}
	214
	215	static PyObject rbmeth_getgeraw(PyObject me, PyObject *arg)
	216	{
217	PyObject *gobj;
218	ge *x = 0;
219	if (!PyArg_ParseTuple(arg, "O!:getgeraw", group_pytype, &gobj)) goto end;
220	x = G_CREATE(GROUP_G(gobj));
221	if (G_FROMRAW(GROUP_G(gobj), BUF_B(me), x)) BUFERR();
222	return (ge_pywrap(gobj, x));
223	end:
224	if (x) G_DESTROY(GROUP_G(gobj), x);
225	return (0);
226	}
227
228	static PyObject rbget_size(PyObject me, void *hunoz)
229	{ return (PyInt_FromLong(BSZ(BUF_B(me)))); }
230	static PyObject rbget_left(PyObject me, void *hunoz)
231	{ return (PyInt_FromLong(BLEFT(BUF_B(me)))); }
232	static PyObject rbget_endp(PyObject me, void *hunoz)
233	{ return (getbool(!BLEFT(BUF_B(me)))); }
0463996f	234	static PyObject rbget_offset(PyObject me, void *hunoz)
	235	{ return (PyInt_FromLong(BLEN(BUF_B(me)))); }
	236	static int rbset_offset(PyObject me, PyObject x, void *hunoz)
	237	{
	238	size_t n;
	239	if (!convszt(x, &n)) goto end;
	240	if (n > BSZ(BUF_B(me))) VALERR("out of range");
	241	BCUR(BUF_B(me)) = BBASE(BUF_B(me)) + n;
	242	return (0);
	243	end:
	244	return (-1);
	245	}
46e6ad89	246
	247	static PyGetSetDef rbuf_pygetset[] = {
	248	#define GETSETNAME(op, name) rb##op##_##name
	249	GET (size, "RBUF.size -> SIZE")
	250	GET (left, "RBUF.left -> REMAINDER")
	251	GET (endp, "RBUF.endp -> BOOL")
0463996f	252	GETSET(offset, "RBUF.offset -> OFFSET")
46e6ad89	253	#undef GETSETNAME
	254	{ 0 }
	255	};
	256
	257	static PyMethodDef rbuf_pymethods[] = {
	258	#define METHNAME(func) rbmeth_##func
	259	METH (skip, "RBUF.skip(N)")
	260	METH (get, "RBUF.get(N) -> BYTES")
	261	#define RBMETH_DECL_GETU_(n, W, w) \
	262	METH(getu##w, "RBUF.getu" #w "() -> INT")
	263	DOUINTCONV(RBMETH_DECL_GETU_)
	264	#define RBMETH_DECL_GETBLK_(n, W, w) \
	265	METH(getblk##w, "RBUF.getblk" #w "() -> INT")
	266	BUF_DOSUFFIXES(RBMETH_DECL_GETBLK_)
0463996f	267	#define RBMETH_DECL_GETBUF_(n, W, w) \
	268	METH(getbuf##w, "RBUF.getbuf" #w "() -> INT")
	269	BUF_DOSUFFIXES(RBMETH_DECL_GETBUF_)
46e6ad89	270	METH (getmp, "RBUF.getmp() -> X")
	271	METH (getgf, "RBUF.getgf() -> X")
	272	KWMETH(getecpt, "RBUF.getecpt(curve = None) -> P")
	273	METH (getecptraw, "RBUF.getecptraw(CURVE) -> P")
	274	METH (getge, "RBUF.getge(GROUP) -> X")
	275	METH (getgeraw, "RBUF.getgeraw(GROUP) -> X")
	276	#undef METHNAME
	277	{ 0 }
	278	};
	279
	280	static PyBufferProcs rbuf_pybuffer = {
	281	rbuf_pyreadbuf, /* @bf_getreadbuffer@ */
	282	0, /* @bf_getwritebuffer@ */
	283	rbuf_pysegcount, /* @bf_getsegcount@ */
	284	0 /* @bf_getcharbuffer@ */
	285	};
	286
	287	static PyTypeObject rbuf_pytype_skel = {
	288	PyObject_HEAD_INIT(0) 0, /* Header */
	289	"catacomb.ReadBuffer", /* @tp_name@ */
	290	sizeof(buf_pyobj), /* @tp_basicsize@ */
	291	0, /* @tp_itemsize@ */
	292
	293	buf_pydealloc, /* @tp_dealloc@ */
	294	0, /* @tp_print@ */
	295	0, /* @tp_getattr@ */
	296	0, /* @tp_setattr@ */
	297	0, /* @tp_compare@ */
	298	0, /* @tp_repr@ */
	299	0, /* @tp_as_number@ */
	300	0, /* @tp_as_sequence@ */
	301	0, /* @tp_as_mapping@ */
	302	0, /* @tp_hash@ */
	303	0, /* @tp_call@ */
	304	0, /* @tp_str@ */
	305	0, /* @tp_getattro@ */
	306	0, /* @tp_setattro@ */
	307	&rbuf_pybuffer, /* @tp_as_buffer@ */
	308	Py_TPFLAGS_DEFAULT \| /* @tp_flags@ */
	309	Py_TPFLAGS_BASETYPE,
	310
	311	/* @tp_doc@ */
	312	"A read buffer.",
	313
	314	0, /* @tp_traverse@ */
	315	0, /* @tp_clear@ */
	316	0, /* @tp_richcompare@ */
	317	0, /* @tp_weaklistoffset@ */
	318	0, /* @tp_iter@ */
963a6148	319	0, /* @tp_iternext@ */
46e6ad89	320	rbuf_pymethods, /* @tp_methods@ */
	321	0, /* @tp_members@ */
	322	rbuf_pygetset, /* @tp_getset@ */
	323	0, /* @tp_base@ */
	324	0, /* @tp_dict@ */
	325	0, /* @tp_descr_get@ */
	326	0, /* @tp_descr_set@ */
	327	0, /* @tp_dictoffset@ */
	328	0, /* @tp_init@ */
	329	PyType_GenericAlloc, /* @tp_alloc@ */
	330	rbuf_pynew, /* @tp_new@ */
	331	0, /* @tp_free@ */
	332	0 /* @tp_is_gc@ */
	333	};
	334
	335	/----- Write buffers -----------------------------------------------------/
	336
	337	static void ensure(PyObject *me, size_t n)
	338	{
	339	buf *b = BUF_B(me);
	340
	341	if (BLEFT(b) < n) {
	342	size_t nn = BSZ(b);
	343	octet *p;
	344	size_t want = BLEFT(b) + n;
	345	while (nn < want) nn <<= 1;
	346	p = xrealloc(BBASE(b), nn, BSZ(b));
	347	BCUR(b) = p + BLEN(b);
	348	BLIM(b) = p + nn;
	349	BBASE(b) = p;
	350	}
	351	}
	352
	353	static PyObject wbuf_pynew(PyTypeObject ty, PyObject arg, PyObject kw)
	354	{
	355	char *p;
	356	size_t n = 64;
	357	buf_pyobj *me = 0;
	358	static char *kwlist[] = { "size", 0 };
	359
	360	if (!PyArg_ParseTupleAndKeywords(arg, kw, "\|O&:new", kwlist,
	361	convszt, &n))
	362	goto end;
	363	me = (buf_pyobj *)ty->tp_alloc(ty, 0);
	364	p = xmalloc(n);
0463996f	365	me->sub = 0;
46e6ad89	366	buf_init(&me->b, p, n);
	367	end:
	368	return ((PyObject *)me);
	369	}
	370
	371	static int wbuf_pysegcount(PyObject me, int nn)
	372	{ if (nn) *nn = BLEN(BUF_B(me)); return (1); }
	373
	374	static int wbuf_pyreadbuf(PyObject me, int seg, void *q)
	375	{ assert(seg == 0); *q = BBASE(BUF_B(me)); return (BLEN(BUF_B(me))); }
	376
	377	static PyObject wbmeth_zero(PyObject me, PyObject *arg)
	378	{
	379	void *p;
	380	size_t n;
	381	if (!PyArg_ParseTuple(arg, "O&:zero", convszt, &n)) return (0);
	382	ensure(me, n);
	383	p = buf_get(BUF_B(me), n); assert(p && BOK(BUF_B(me)));
	384	memset(p, 0, n);
	385	RETURN_ME;
	386	}
	387
	388	static PyObject wbmeth_put(PyObject me, PyObject *arg)
	389	{
	390	void *p;
	391	int n;
	392	if (!PyArg_ParseTuple(arg, "s#:put", &p, &n)) return (0);
	393	ensure(me, n);
	394	buf_put(BUF_B(me), p, n); assert(BOK(BUF_B(m)));
	395	RETURN_ME;
	396	}
	397
	398	#define WBMETH_PUTU_(n, W, w) \
	399	static PyObject wbmeth_putu##w(PyObject me, PyObject *arg) \
	400	{ \
	401	uint##n i; \
	402	if (!PyArg_ParseTuple(arg, "O&:putu" #w, convu##n, &i)) return (0); \
	403	ensure(me, SZ_##n); \
	404	buf_putu##w(BUF_B(me), i); assert(BOK(BUF_B(me))); \
	405	RETURN_ME; \
	406	}
	407	DOUINTCONV(WBMETH_PUTU_)
	408
	409	#define SZ_z 1
	410	#define WBMETH_PUTBLK_(n, W, w) \
	411	static PyObject wbmeth_putblk##w(PyObject me, PyObject *arg) \
	412	{ \
	413	char *p; \
	414	int sz; \
	415	if (!PyArg_ParseTuple(arg, "s#:putblk" #w, &p, &sz)) return (0); \
	416	ensure(me, sz + SZ_##n); \
	417	buf_putmem##w(BUF_B(me), p, sz); assert(BOK(BUF_B(me))); \
	418	RETURN_ME; \
	419	}
	420	BUF_DOSUFFIXES(WBMETH_PUTBLK_)
	421
	422	static PyObject wbmeth_putmp(PyObject me, PyObject *arg)
	423	{
	424	mp *x = 0;
	425	if (!PyArg_ParseTuple(arg, "O&:putmp", convmp, &x)) return (0);
	426	ensure(me, mp_octets(x) + 2);
	427	buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
	428	RETURN_ME;
	429	}
430
431	static PyObject wbmeth_putgf(PyObject me, PyObject *arg)
432	{
433	mp *x = 0;
434	if (!PyArg_ParseTuple(arg, "O&:putgf", convgf, &x)) return (0);
435	ensure(me, mp_octets(x) + 2);
436	buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
437	MP_DROP(x);
438	RETURN_ME;
439	}
440
441	static PyObject wbmeth_putecpt(PyObject me, PyObject *arg)
442	{
443	ec pt = EC_INIT;
444	if (!PyArg_ParseTuple(arg, "O&:putecpt", convecpt, &pt)) return (0);
445	if (EC_ATINF(&pt)) ensure(me, 2);
446	else ensure(me, 4 + mp_octets(pt.x) + mp_octets(pt.y));
447	buf_putec(BUF_B(me), &pt); assert(BOK(BUF_B(me)));
448	EC_DESTROY(&pt);
449	RETURN_ME;
450	}
451
452	static PyObject wbmeth_putecptraw(PyObject me, PyObject *arg)
453	{
454	PyObject *ptobj;
455	ec pt = EC_INIT;
456	if (!PyArg_ParseTuple(arg, "O!:putecptraw", ecptcurve_pytype, &ptobj))
457	return (0);
458	EC_OUT(ECPT_C(ptobj), &pt, ECPT_P(ptobj));
459	ensure(me, ECPT_C(ptobj)->f->noctets * 2 + 1);
460	ec_putraw(ECPT_C(ptobj), BUF_B(me), &pt); assert(BOK(BUF_B(me)));
461	EC_DESTROY(&pt);
462	RETURN_ME;
463	}
464
465	static PyObject wbmeth_putge(PyObject me, PyObject *arg)
466	{
467	PyObject *geobj;
468	if (!PyArg_ParseTuple(arg, "O!:putge", ge_pytype, &geobj)) return (0);
469	ensure(me, GE_G(geobj)->noctets);
470	G_TOBUF(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
471	RETURN_ME;
472	}
473
474	static PyObject wbmeth_putgeraw(PyObject me, PyObject *arg)
475	{
476	PyObject *geobj;
477	if (!PyArg_ParseTuple(arg, "O!:putgeraw", ge_pytype, &geobj)) return (0);
478	ensure(me, GE_G(geobj)->noctets);
479	G_TORAW(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
480	RETURN_ME;
481	}
482
483	static PyObject wbget_size(PyObject me, void *hunoz)
484	{ return (PyInt_FromLong(BLEN(BUF_B(me)))); }
485
486	static PyGetSetDef wbuf_pygetset[] = {
487	#define GETSETNAME(op, name) wb##op##_##name
488	GET (size, "WBUF.size -> SIZE")
489	#undef GETSETNAME
490	{ 0 }
491	};
492
493	static PyMethodDef wbuf_pymethods[] = {
494	#define METHNAME(func) wbmeth_##func
495	METH (zero, "WBUF.skip(N)")
496	METH (put, "WBUF.put(BYTES)")
497	#define WBMETH_DECL_PUTU_(n, W, w) \
498	METH(putu##w, "WBUF.putu" #w "(INT)")
499	DOUINTCONV(WBMETH_DECL_PUTU_)
500	#define WBMETH_DECL_PUTBLK_(n, W, w) \
501	METH(putblk##w, "WBUF.putblk" #w "(BYTES)")
502	BUF_DOSUFFIXES(WBMETH_DECL_PUTBLK_)
503	METH (putmp, "WBUF.putmp(X)")
504	METH (putgf, "WBUF.putgf(X)")
505	KWMETH(putecpt, "WBUF.putecpt(P)")
506	METH (putecptraw, "WBUF.putecptraw(P)")
507	METH (putge, "WBUF.putge(X)")
508	METH (putgeraw, "WBUF.putgeraw(X)")
509	#undef METHNAME
510	{ 0 }
511	};
512
513	static PyBufferProcs wbuf_pybuffer = {
514	wbuf_pyreadbuf, /* @bf_getreadbuffer@ */
515	0, /* @bf_getwritebuffer@ */
516	wbuf_pysegcount, /* @bf_getsegcount@ */
517	0 /* @bf_getcharbuffer@ */
518	};
519
520	static PyTypeObject wbuf_pytype_skel = {
521	PyObject_HEAD_INIT(0) 0, /* Header */
522	"catacomb.WriteBuffer", /* @tp_name@ */
523	sizeof(buf_pyobj), /* @tp_basicsize@ */
524	0, /* @tp_itemsize@ */
525
526	buf_pydealloc, /* @tp_dealloc@ */
527	0, /* @tp_print@ */
528	0, /* @tp_getattr@ */
529	0, /* @tp_setattr@ */
530	0, /* @tp_compare@ */
531	0, /* @tp_repr@ */
532	0, /* @tp_as_number@ */
533	0, /* @tp_as_sequence@ */
534	0, /* @tp_as_mapping@ */
535	0, /* @tp_hash@ */
536	0, /* @tp_call@ */
537	0, /* @tp_str@ */
538	0, /* @tp_getattro@ */
539	0, /* @tp_setattro@ */
540	&wbuf_pybuffer, /* @tp_as_buffer@ */
541	Py_TPFLAGS_DEFAULT \| /* @tp_flags@ */
542	Py_TPFLAGS_BASETYPE,
543
544	/* @tp_doc@ */
545	"A write buffer.",
546
547	0, /* @tp_traverse@ */
548	0, /* @tp_clear@ */
549	0, /* @tp_richcompare@ */
550	0, /* @tp_weaklistoffset@ */
551	0, /* @tp_iter@ */
963a6148	552	0, /* @tp_iternext@ */
46e6ad89	553	wbuf_pymethods, /* @tp_methods@ */
	554	0, /* @tp_members@ */
	555	wbuf_pygetset, /* @tp_getset@ */
	556	0, /* @tp_base@ */
	557	0, /* @tp_dict@ */
	558	0, /* @tp_descr_get@ */
	559	0, /* @tp_descr_set@ */
	560	0, /* @tp_dictoffset@ */
	561	0, /* @tp_init@ */
	562	PyType_GenericAlloc, /* @tp_alloc@ */
	563	wbuf_pynew, /* @tp_new@ */
	564	0, /* @tp_free@ */
	565	0 /* @tp_is_gc@ */
	566	};
	567
	568	/----- Initialization ----------------------------------------------------/
	569
	570	void buffer_pyinit(void)
	571	{
	572	INITTYPE(rbuf, root);
	573	INITTYPE(wbuf, root);
	574	}
	575
	576	void buffer_pyinsert(PyObject *mod)
	577	{
	578	INSEXC("BufferError", buferr, PyExc_Exception, 0);
	579	INSERT("ReadBuffer", rbuf_pytype);
	580	INSERT("WriteBuffer", wbuf_pytype);
	581	}
	582
	583	/----- That's all, folks -------------------------------------------------/