bytestring.c (dowrap): Factor out allocating the bytestring object.

[catacomb-python] / bytestring.c

/* -*-c-*-
 *
 * Byte strings
 *
 * (c) 2004 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"

/*----- Main code ---------------------------------------------------------*/

PyTypeObject *bytestring_pytype;

static PyObject *allocate(PyTypeObject *ty, size_t n)
{
  PyStringObject *x;
  x = (PyStringObject *)ty->tp_alloc(ty, n);
  x->ob_sval[n] = 0;
#if defined(CACHE_HASH) || PY_VERSION_HEX >= 0x02030000
  x->ob_shash = -1;
#endif
  x->ob_sstate = SSTATE_NOT_INTERNED;
  return ((PyObject *)x);
}

static PyObject *dowrap(PyTypeObject *ty, const void *p, size_t n)
{
  PyObject *x;

  x = allocate(ty, n);
  if (p) memcpy(PyString_AS_STRING(x), p, n);
  return (x);
}

PyObject *bytestring_pywrap(const void *p, size_t n)
  { return (dowrap(bytestring_pytype, p, n)); }

PyObject *bytestring_pywrapbuf(buf *b)
  { return (dowrap(bytestring_pytype, BCUR(b), BLEFT(b))); }

static PyObject *bytestring_pynew(PyTypeObject *ty,
				  PyObject *arg, PyObject *kw)
{
  const char *p;
  Py_ssize_t n;
  static const char *const kwlist[] = { "data", 0 };
  if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &p, &n))
    return (0);
  return (dowrap(ty, p, n));
}

static PyObject *meth_ctstreq(PyObject *me, PyObject *arg)
{
  char *p, *q;
  Py_ssize_t psz, qsz;
  if (!PyArg_ParseTuple(arg, "s#s#:ctstreq", &p, &psz, &q, &qsz))
    goto end;
  if (psz == qsz && ct_memeq(p, q, psz)) RETURN_TRUE;
  else RETURN_FALSE;
end:
  return (0);
}

static PyObject *meth__ByteString_zero(PyObject *me, PyObject *arg)
{
  size_t sz;
  PyObject *rc = 0;
  if (!PyArg_ParseTuple(arg, "OO&:zero", &me, convszt, &sz)) goto end;
  rc = bytestring_pywrap(0, sz);
  memset(PyString_AS_STRING(rc), 0, sz);
end:
  return (rc);
}

static PyObject *bytestring_pyrichcompare(PyObject *me,
					  PyObject *you, int op)
{
  int b;
  void *mystr, *yourstr;
  Py_ssize_t mylen, yourlen, minlen;

  if (!PyString_Check(me) || !PyString_Check(you)) RETURN_NOTIMPL;
  mystr = PyString_AS_STRING(me); mylen = PyString_GET_SIZE(me);
  yourstr = PyString_AS_STRING(you); yourlen = PyString_GET_SIZE(you);

  switch (op) {
    case Py_EQ:
      b = mylen == yourlen && ct_memeq(mystr, yourstr, mylen);
      break;
    case Py_NE:
      b = mylen != yourlen || !ct_memeq(mystr, yourstr, mylen);
      break;
    default:
      minlen = mylen < yourlen ? mylen : yourlen;
      b = memcmp(mystr, yourstr, minlen);
      if (!b) b = mylen < yourlen ? -1 : mylen > yourlen ? +1 : 0;
      switch (op) {
	case Py_LT: b = b <  0; break;
	case Py_LE: b = b <= 0; break;
	case Py_GE: b = b >= 0; break;
	case Py_GT: b = b >  0; break;
	default: abort();
      }
  }
  if (b) RETURN_TRUE;
  else RETURN_FALSE;
}

#define BINOP(name, op)							\
  static PyObject *bytestring_py##name(PyObject *x, PyObject *y) {	\
    const void *xv, *yv;						\
    const unsigned char *xp, *yp;					\
    unsigned char *zp;							\
    Py_ssize_t xsz, ysz;						\
    int i;								\
    PyObject *rc = 0;							\
    if (PyObject_AsReadBuffer(x, &xv, &xsz) ||				\
	PyObject_AsReadBuffer(y, &yv, &ysz))				\
      goto end;								\
    if (xsz != ysz) VALERR("length mismatch");				\
    rc = bytestring_pywrap(0, xsz);					\
    xp = xv; yp = yv; zp = (unsigned char *)PyString_AS_STRING(rc);	\
    for (i = xsz; i > 0; i--) *zp++ = *xp++ op *yp++;			\
  end:									\
    return (rc);							\
  }
BINOP(and, &)
BINOP(or, |)
BINOP(xor, ^)

#define UNOP(name, op)							\
  static PyObject *bytestring_py##name(PyObject *x) {			\
    const void *xv;							\
    const unsigned char *xp;						\
    unsigned char *zp;							\
    Py_ssize_t xsz;							\
    int i;								\
    PyObject *rc = 0;							\
    if (PyObject_AsReadBuffer(x, &xv, &xsz)) goto end;			\
    rc = bytestring_pywrap(0, xsz);					\
    xp = xv; zp = (unsigned char *)PyString_AS_STRING(rc);		\
    for (i = xsz; i > 0; i--) *zp++ = op *xp++;				\
  end:									\
    return (rc);							\
  }
UNOP(not, ~)

static PyNumberMethods bytestring_pynumber = {
  0,					/* @nb_add@ */
  0,					/* @nb_subtract@ */
  0,					/* @nb_multiply@ */
  0,					/* @nb_divide@ */
  0,					/* @nb_remainder@ */
  0,					/* @nb_divmod@ */
  0,					/* @nb_power@ */
  0,					/* @nb_negative@ */
  0,					/* @nb_positive@ */
  0,					/* @nb_absolute@ */
  0,					/* @nb_nonzero@ */
  bytestring_pynot,			/* @nb_invert@ */
  0,					/* @nb_lshift@ */
  0,					/* @nb_rshift@ */
  bytestring_pyand,			/* @nb_and@ */
  bytestring_pyxor,			/* @nb_xor@ */
  bytestring_pyor,			/* @nb_or@ */
  0,					/* @nb_coerce@ */
  0,					/* @nb_int@ */
  0,					/* @nb_long@ */
  0,					/* @nb_float@ */
  0,					/* @nb_oct@ */
  0,					/* @nb_hex@ */
};

static PyBufferProcs bytestring_pybuffer;

static PyTypeObject bytestring_pytype_skel = {
  PyObject_HEAD_INIT(0) 0,		/* Header */
  "ByteString",				/* @tp_name@ */
  0,					/* @tp_basicsize@ */
  0,					/* @tp_itemsize@ */

  0,					/* @tp_dealloc@ */
  0,					/* @tp_print@ */
  0,					/* @tp_getattr@ */
  0,					/* @tp_setattr@ */
  0,					/* @tp_compare@ */
  0,					/* @tp_repr@ */
  &bytestring_pynumber,			/* @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@ */
  &bytestring_pybuffer,			/* @tp_as_buffer@ */
  Py_TPFLAGS_DEFAULT |			/* @tp_flags@ */
    Py_TPFLAGS_CHECKTYPES |
    Py_TPFLAGS_BASETYPE,

  /* @tp_doc@ */
"ByteString(STR): byte string class.",

  0,					/* @tp_traverse@ */
  0,					/* @tp_clear@ */
  bytestring_pyrichcompare,		/* @tp_richcompare@ */
  0,					/* @tp_weaklistoffset@ */
  0,					/* @tp_iter@ */
  0,					/* @tp_iternext@ */
  0,					/* @tp_methods@ */
  0,					/* @tp_members@ */
  0,					/* @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@ */
  bytestring_pynew,			/* @tp_new@ */
  0,					/* @tp_free@ */
  0					/* @tp_is_gc@ */
};

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

static PyMethodDef methods[] = {
#define METHNAME(func) meth_##func
  METH  (ctstreq,		"ctstreq(S, T) -> BOOL")
  METH	(_ByteString_zero,	"zero(N) -> 0000...00")
#undef METHNAME
  { 0 }
};

#define string_pytype &PyString_Type
void bytestring_pyinit(void)
{
  INITTYPE(bytestring, string);
  addmethods(methods);
}

void bytestring_pyinsert(PyObject *mod)
{
  INSERT("ByteString", bytestring_pytype);
}

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