@@@ py_buffer/freebin wip

[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 ---------------------------------------------------------*/

static PyTypeObject *bytestring_pytype;

static PyObject *empty, *bytev[256];

static PyObject *allocate(PyTypeObject *ty, size_t n)
{
  BINOBJ *x;
  x = (BINOBJ *)ty->tp_alloc(ty, n);
  x->ob_sval[n] = 0;
#if defined(CACHE_HASH) || PY_VERSION_HEX >= 0x02030000
  x->ob_shash = -1;
#endif
#ifdef PY2
  x->ob_sstate = SSTATE_NOT_INTERNED;
#endif
  return ((PyObject *)x);
}

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

  if (p && ty == bytestring_pytype) {
    if (!n) {
      if (!empty) empty = allocate(ty, 0);
      Py_INCREF(empty); return (empty);
    } else if (n == 1 && (ch = *(unsigned char *)p) < sizeof(bytev)) {
      if (!bytev[ch])
	{ bytev[ch] = allocate(ty, 1); *BIN_PTR(bytev[ch]) = ch; }
      Py_INCREF(bytev[ch]); return (bytev[ch]);
    }
  }

  x = allocate(ty, n);
  if (p) memcpy(BIN_PTR(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)
{
  struct bin in;
  static const char *const kwlist[] = { "data", 0 };
  if (!PyArg_ParseTupleAndKeywords(arg, kw, "O&:new", KWLIST, convbin, &in))
    return (0);
  return (dowrap(ty, in.p, in.sz));
}

static PyObject *meth_ctstreq(PyObject *me, PyObject *arg)
{
  struct bin s0, s1;
  if (!PyArg_ParseTuple(arg, "O&O&:ctstreq", convbin, &s0 , convbin, &s1))
    goto end;
  if (s0.sz == s1.sz && ct_memeq(s0.p, s1.p, s0.sz)) RETURN_TRUE;
  else RETURN_FALSE;
end:
  return (0);
}

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

static PyObject *bytestring_pyrichcompare(PyObject *me,
					  PyObject *you, int op)
{
  struct bin s0, s1;
  int b;
  Py_ssize_t minlen;

  s0.p = BIN_PTR(me); s0.sz = BIN_LEN(me);
  if (!convbin(you, &s1)) { PyErr_Clear(); RETURN_NOTIMPL; }

  switch (op) {
    case Py_EQ:
      b = s0.sz == s1.sz && ct_memeq(s0.p, s1.p, s1.sz);
      break;
    case Py_NE:
      b = s0.sz != s1.sz || !ct_memeq(s0.p, s1.p, s1.sz);
      break;
    default:
      minlen = s0.sz < s1.sz ? s0.sz : s1.sz;
      b = memcmp(s0.p, s1.p, minlen);
      if (!b) b = s0.sz < s1.sz ? -1 : s0.sz > s1.sz ? +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;
}

static PyObject *bytestring_pyconcat(PyObject *x, PyObject *y)
{
  struct bin xx, yy;
  PyObject *z = 0; char *zp; size_t zsz;

  if (!convbin(x, &xx) || !convbin(y, &yy)) goto end;
  zsz = (size_t)xx.sz + (size_t)yy.sz;
  if (xx.sz < 0 || yy.sz < 0 || zsz < xx.sz) VALERR("too long");
  z = bytestring_pywrap(0, zsz); zp = BIN_PTR(z);
  memcpy(zp, xx.p, xx.sz); memcpy(zp + xx.sz, yy.p, yy.sz);
end:
  return (z);
}

static PyObject *bytestring_pyrepeat(PyObject *me, Py_ssize_t n)
{
  const unsigned char *xp; size_t xsz;
  PyObject *z = 0; char *zp; size_t zsz;

  xp = (const unsigned char *)BIN_PTR(me);
  xsz = BIN_LEN(me);
  if (n < 0 || (n && xsz >= (size_t)-1/n)) VALERR("too long");
  zsz = n*xsz; z = bytestring_pywrap(0, zsz); zp = BIN_PTR(z);
  if (xsz == 1) memset(zp, *xp, zsz);
  else while (zsz) { memcpy(zp, xp, xsz); zp += xsz; zsz -= xsz; }
end:
  return (z);
}

static PyObject *bytestring_pyitem(PyObject *me, Py_ssize_t i)
{
  PyObject *rc = 0;

  if (i < 0 || i >= BIN_LEN(me)) IXERR("out of range");
#ifdef PY3
  rc = getulong(BIN_PTR(me)[i]&0xff);
#else
  rc = bytestring_pywrap(BIN_PTR(me) + i, 1);
#endif
end:
  return (rc);
}

static PyObject *bytestring_pyslice(PyObject *me, Py_ssize_t i, Py_ssize_t j)
{
  PyObject *rc = 0;
  size_t n = BIN_LEN(me);

  if (i < 0) i = 0;
  if (j < 0) j = 0;
  else if (j > n) j = n;
  if (j < i) i = j = 0;
  if (i == 0 && j == n && Py_TYPE(me) == bytestring_pytype)
    { Py_INCREF(me); rc = me; goto end; }
  rc = bytestring_pywrap(BIN_PTR(me) + i, j - i);
end:
  return (rc);
}

static PyObject *bytestring_pysubscript(PyObject *me, PyObject *ix)
{
  Py_ssize_t i, j, k, n;
  const unsigned char *p;
  unsigned char *q;
  PyObject *rc = 0;

  if (PyIndex_Check(ix)) {
    i = PyNumber_AsSsize_t(ix, PyExc_IndexError);
    if (i == -1 && PyErr_Occurred()) return (0);
    if (i < 0) i += BIN_LEN(me);
    rc = bytestring_pyitem(me, i);
  } else if (PySlice_Check(ix)) {
    if (PySlice_GetIndicesEx(PY23((PySliceObject *), NOTHING)ix,
			     BIN_LEN(me), &i, &j, &k, &n))
      return (0);
    if (k == 1) return bytestring_pyslice(me, i, j);
    rc = bytestring_pywrap(0, n);
    p = (unsigned char *)BIN_PTR(me) + i;
    q = (unsigned char *)BIN_PTR(rc);
    while (n--) { *q++ = *p; p += k; }
  } else
    TYERR("wanted integer or slice");
end:
  return (rc);
}

#define BINOP(name, op)							\
  static PyObject *bytestring_py##name(PyObject *x, PyObject *y) {	\
    struct bin xx, yy;							\
    const unsigned char *xp, *yp;					\
    unsigned char *zp;							\
    int i;								\
    PyObject *rc = 0;							\
    if (!convbin(x, &xx) || !convbin(y, &yy)) goto end;			\
    if (xx.sz != yy.sz) VALERR("length mismatch");			\
    rc = bytestring_pywrap(0, xx.sz);					\
    xp = xx.p; yp = yy.p; zp = (unsigned char *)BIN_PTR(rc);		\
    for (i = xx.sz; 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) {			\
    struct bin xx;							\
    const unsigned char *xp;						\
    unsigned char *zp;							\
    int i;								\
    PyObject *rc = 0;							\
    if (!convbin(x, &xx)) goto end;					\
    rc = bytestring_pywrap(0, xx.sz);					\
    xp = xx.p; zp = (unsigned char *)BIN_PTR(rc);			\
    for (i = xx.sz; i > 0; i--) *zp++ = op *xp++;			\
  end:									\
    return (rc);							\
  }
UNOP(not, ~)

static const PyMethodDef bytestring_pymethods[] = {
#define METHNAME(name) bymeth_##name
  SMTH	(zero,		"zero(N) -> 0000...00")
#undef METHNAME
  { 0 }
};

static const PyNumberMethods bytestring_pynumber = {
  0,					/* @nb_add@ */
  0,					/* @nb_subtract@ */
  0,					/* @nb_multiply@ */
#ifdef PY2
  0,					/* @nb_divide@ */
#endif
  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 const PySequenceMethods bytestring_pysequence = {
  0,					/* @sq_length@ */
  bytestring_pyconcat,			/* @sq_concat@ */
  bytestring_pyrepeat,			/* @sq_repeat@ */
  bytestring_pyitem,			/* @sq_item@ */
  bytestring_pyslice,			/* @sq_slice@ */
  0,					/* @sq_ass_item@ */
  0,					/* @sq_ass_slice@ */
  0,					/* @sq_contains@ */
  0,					/* @sq_inplace_concat@ */
  0,					/* @sq_inplace_repeat@ */
};

static const PyMappingMethods bytestring_pymapping = {
  0,					/* @mp_length@ */
  bytestring_pysubscript,		/* @mp_subscript@ */
  0,					/* @mp_ass_subscript@ */
};

static const PyTypeObject bytestring_pytype_skel = {
  PyVarObject_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@ */
  PYNUMBER(bytestring),			/* @tp_as_number@ */
  PYSEQUENCE(bytestring),		/* @tp_as_sequence@ */
  PYMAPPING(bytestring),		/* @tp_as_mapping@ */
  0,					/* @tp_hash@ */
  0,					/* @tp_call@ */
  0,					/* @tp_str@ */
  0,					/* @tp_getattro@ */
  0,					/* @tp_setattro@ */
  0,					/* @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@ */
  PYMETHODS(bytestring),		/* @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 const PyMethodDef methods[] = {
#define METHNAME(func) meth_##func
  METH	(ctstreq,	"ctstreq(S, T) -> BOOL")
#undef METHNAME
  { 0 }
};

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

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

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