chiark - git - mdw - catacomb-python/blob - bytestring.c

   1 /* -*-c-*-
   2  *
   3  * Byte strings
   4  *
   5  * (c) 2004 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   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.
  16  *
  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.
  21  *
  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 /*----- Main code ---------------------------------------------------------*/
  32
  33 PyTypeObject *bytestring_pytype;
  34
  35 static PyObject *dowrap(PyTypeObject *ty, const void *p, size_t n)
  36 {
  37   PyStringObject *x = (PyStringObject *)ty->tp_alloc(ty, n);
  38   if (p) memcpy(x->ob_sval, p, n);
  39   x->ob_sval[n] = 0;
  40 #if defined(CACHE_HASH) || PY_VERSION_HEX >= 0x02030000
  41   x->ob_shash = -1;
  42 #endif
  43   x->ob_sstate = SSTATE_NOT_INTERNED;
  44   return ((PyObject *)x);
  45 }
  46
  47 PyObject *bytestring_pywrap(const void *p, size_t n)
  48   { return (dowrap(bytestring_pytype, p, n)); }
  49
  50 PyObject *bytestring_pywrapbuf(buf *b)
  51   { return (dowrap(bytestring_pytype, BCUR(b), BLEFT(b))); }
  52
  53 static PyObject *bytestring_pynew(PyTypeObject *ty,
  54                                   PyObject *arg, PyObject *kw)
  55 {
  56   const char *p;
  57   Py_ssize_t n;
  58   static char *kwlist[] = { "data", 0 };
  59   if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", kwlist, &p, &n))
  60     return (0);
  61   return (dowrap(ty, p, n));
  62 }
  63
  64 static PyObject *meth_ctstreq(PyObject *me, PyObject *arg)
  65 {
  66   char *p, *q;
  67   Py_ssize_t psz, qsz;
  68   if (!PyArg_ParseTuple(arg, "s#s#:ctstreq", &p, &psz, &q, &qsz))
  69     goto end;
  70   if (psz == qsz && ct_memeq(p, q, psz)) RETURN_TRUE;
  71   else RETURN_FALSE;
  72 end:
  73   return (0);
  74 }
  75
  76 static PyObject *bytestring_pyrichcompare(PyObject *me,
  77                                           PyObject *you, int op)
  78 {
  79   int b;
  80   void *mystr, *yourstr;
  81   Py_ssize_t mylen, yourlen, minlen;
  82
  83   if (!PyString_Check(me) || !PyString_Check(you)) RETURN_NOTIMPL;
  84   mystr = PyString_AS_STRING(me); mylen = PyString_GET_SIZE(me);
  85   yourstr = PyString_AS_STRING(you); yourlen = PyString_GET_SIZE(you);
  86
  87   switch (op) {
  88     case Py_EQ:
  89       b = mylen == yourlen && ct_memeq(mystr, yourstr, mylen);
  90       break;
  91     case Py_NE:
  92       b = mylen != yourlen || !ct_memeq(mystr, yourstr, mylen);
  93       break;
  94     default:
  95       minlen = mylen < yourlen ? mylen : yourlen;
  96       b = memcmp(mystr, yourstr, minlen);
  97       if (!b) b = mylen < yourlen ? -1 : mylen > yourlen ? +1 : 0;
  98       switch (op) {
  99         case Py_LT: b = b <  0; break;
 100         case Py_LE: b = b <= 0; break;
 101         case Py_GE: b = b >= 0; break;
 102         case Py_GT: b = b >  0; break;
 103         default: abort();
 104       }
 105   }
 106   if (b) RETURN_TRUE;
 107   else RETURN_FALSE;
 108 }
 109
 110 #define BINOP(name, op)                                                 \
 111   static PyObject *bytestring_py##name(PyObject *x, PyObject *y) {      \
 112     const void *xv, *yv;                                                \
 113     const unsigned char *xp, *yp;                                       \
 114     unsigned char *zp;                                                  \
 115     Py_ssize_t xsz, ysz;                                                \
 116     int i;                                                              \
 117     PyObject *rc = 0;                                                   \
 118     if (PyObject_AsReadBuffer(x, &xv, &xsz) ||                          \
 119         PyObject_AsReadBuffer(y, &yv, &ysz))                            \
 120       goto end;                                                         \
 121     if (xsz != ysz) VALERR("length mismatch");                          \
 122     rc = bytestring_pywrap(0, xsz);                                     \
 123     xp = xv; yp = yv; zp = (unsigned char *)PyString_AS_STRING(rc);     \
 124     for (i = xsz; i > 0; i--) *zp++ = *xp++ op *yp++;                   \
 125   end:                                                                  \
 126     return (rc);                                                        \
 127   }
 128 BINOP(and, &)
 129 BINOP(or, |)
 130 BINOP(xor, ^)
 131
 132 #define UNOP(name, op)                                                  \
 133   static PyObject *bytestring_py##name(PyObject *x) {                   \
 134     const void *xv;                                                     \
 135     const unsigned char *xp;                                            \
 136     unsigned char *zp;                                                  \
 137     Py_ssize_t xsz;                                                     \
 138     int i;                                                              \
 139     PyObject *rc = 0;                                                   \
 140     if (PyObject_AsReadBuffer(x, &xv, &xsz)) goto end;                  \
 141     rc = bytestring_pywrap(0, xsz);                                     \
 142     xp = xv; zp = (unsigned char *)PyString_AS_STRING(rc);              \
 143     for (i = xsz; i > 0; i--) *zp++ = op *xp++;                         \
 144   end:                                                                  \
 145     return (rc);                                                        \
 146   }
 147 UNOP(not, ~)
 148
 149 static PyNumberMethods bytestring_pynumber = {
 150   0,                                    /* @nb_add@ */
 151   0,                                    /* @nb_subtract@ */
 152   0,                                    /* @nb_multiply@ */
 153   0,                                    /* @nb_divide@ */
 154   0,                                    /* @nb_remainder@ */
 155   0,                                    /* @nb_divmod@ */
 156   0,                                    /* @nb_power@ */
 157   0,                                    /* @nb_negative@ */
 158   0,                                    /* @nb_positive@ */
 159   0,                                    /* @nb_absolute@ */
 160   0,                                    /* @nb_nonzero@ */
 161   bytestring_pynot,                     /* @nb_invert@ */
 162   0,                                    /* @nb_lshift@ */
 163   0,                                    /* @nb_rshift@ */
 164   bytestring_pyand,                     /* @nb_and@ */
 165   bytestring_pyxor,                     /* @nb_xor@ */
 166   bytestring_pyor,                      /* @nb_or@ */
 167   0,                                    /* @nb_coerce@ */
 168   0,                                    /* @nb_int@ */
 169   0,                                    /* @nb_long@ */
 170   0,                                    /* @nb_float@ */
 171   0,                                    /* @nb_oct@ */
 172   0,                                    /* @nb_hex@ */
 173 };
 174
 175 static PyBufferProcs bytestring_pybuffer;
 176
 177 static PyTypeObject bytestring_pytype_skel = {
 178   PyObject_HEAD_INIT(0) 0,              /* Header */
 179   "ByteString",                         /* @tp_name@ */
 180   0,                                    /* @tp_basicsize@ */
 181   0,                                    /* @tp_itemsize@ */
 182
 183   0,                                    /* @tp_dealloc@ */
 184   0,                                    /* @tp_print@ */
 185   0,                                    /* @tp_getattr@ */
 186   0,                                    /* @tp_setattr@ */
 187   0,                                    /* @tp_compare@ */
 188   0,                                    /* @tp_repr@ */
 189   &bytestring_pynumber,                 /* @tp_as_number@ */
 190   0,                                    /* @tp_as_sequence@ */
 191   0,                                    /* @tp_as_mapping@ */
 192   0,                                    /* @tp_hash@ */
 193   0,                                    /* @tp_call@ */
 194   0,                                    /* @tp_str@ */
 195   0,                                    /* @tp_getattro@ */
 196   0,                                    /* @tp_setattro@ */
 197   &bytestring_pybuffer,                 /* @tp_as_buffer@ */
 198   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 199     Py_TPFLAGS_CHECKTYPES |
 200     Py_TPFLAGS_BASETYPE,
 201
 202   /* @tp_doc@ */
 203 "Byte string class.",
 204
 205   0,                                    /* @tp_traverse@ */
 206   0,                                    /* @tp_clear@ */
 207   bytestring_pyrichcompare,             /* @tp_richcompare@ */
 208   0,                                    /* @tp_weaklistoffset@ */
 209   0,                                    /* @tp_iter@ */
 210   0,                                    /* @tp_iternext@ */
 211   0,                                    /* @tp_methods@ */
 212   0,                                    /* @tp_members@ */
 213   0,                                    /* @tp_getset@ */
 214   0,                                    /* @tp_base@ */
 215   0,                                    /* @tp_dict@ */
 216   0,                                    /* @tp_descr_get@ */
 217   0,                                    /* @tp_descr_set@ */
 218   0,                                    /* @tp_dictoffset@ */
 219   0,                                    /* @tp_init@ */
 220   PyType_GenericAlloc,                  /* @tp_alloc@ */
 221   bytestring_pynew,                     /* @tp_new@ */
 222   0,                                    /* @tp_free@ */
 223   0                                     /* @tp_is_gc@ */
 224 };
 225
 226 /*----- Initialization ----------------------------------------------------*/
 227
 228 static PyMethodDef methods[] = {
 229 #define METHNAME(func) meth_##func
 230   METH  (ctstreq,               "ctstreq(S, T) -> BOOL")
 231 #undef METHNAME
 232   { 0 }
 233 };
 234
 235 #define string_pytype &PyString_Type
 236 void bytestring_pyinit(void)
 237 {
 238   INITTYPE(bytestring, string);
 239   addmethods(methods);
 240 }
 241
 242 void bytestring_pyinsert(PyObject *mod)
 243 {
 244   INSERT("ByteString", bytestring_pytype);
 245 }
 246
 247 /*----- That's all, folks -------------------------------------------------*/