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 #ifdef CACHE_HASH
  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   int 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 #define BINOP(name, op)                                                 \
  65   static PyObject *bytestring_py##name(PyObject *x, PyObject *y) {      \
  66     const void *xv, *yv;                                                \
  67     const unsigned char *xp, *yp;                                       \
  68     unsigned char *zp;                                                  \
  69     Py_ssize_t xsz, ysz;                                                \
  70     int i;                                                              \
  71     PyObject *rc = 0;                                                   \
  72     if (PyObject_AsReadBuffer(x, &xv, &xsz) ||                          \
  73         PyObject_AsReadBuffer(y, &yv, &ysz))                            \
  74       goto end;                                                         \
  75     if (xsz != ysz) VALERR("length mismatch");                          \
  76     rc = bytestring_pywrap(0, xsz);                                     \
  77     xp = xv; yp = yv; zp = (unsigned char *)PyString_AS_STRING(rc);     \
  78     for (i = xsz; i > 0; i--) *zp++ = *xp++ op *yp++;                   \
  79   end:                                                                  \
  80     return (rc);                                                        \
  81   }
  82 BINOP(and, &)
  83 BINOP(or, |)
  84 BINOP(xor, ^)
  85
  86 #define UNOP(name, op)                                                  \
  87   static PyObject *bytestring_py##name(PyObject *x) {                   \
  88     const void *xv;                                                     \
  89     const unsigned char *xp;                                            \
  90     unsigned char *zp;                                                  \
  91     Py_ssize_t xsz;                                                     \
  92     int i;                                                              \
  93     PyObject *rc = 0;                                                   \
  94     if (PyObject_AsReadBuffer(x, &xv, &xsz)) goto end;                  \
  95     rc = bytestring_pywrap(0, xsz);                                     \
  96     xp = xv; zp = (unsigned char *)PyString_AS_STRING(rc);              \
  97     for (i = xsz; i > 0; i--) *zp++ = op *xp++;                         \
  98   end:                                                                  \
  99     return (rc);                                                        \
 100   }
 101 UNOP(not, ~)
 102
 103 static PyNumberMethods bytestring_pynumber = {
 104   0,                                    /* @nb_add@ */
 105   0,                                    /* @nb_subtract@ */
 106   0,                                    /* @nb_multiply@ */
 107   0,                                    /* @nb_divide@ */
 108   0,                                    /* @nb_remainder@ */
 109   0,                                    /* @nb_divmod@ */
 110   0,                                    /* @nb_power@ */
 111   0,                                    /* @nb_negative@ */
 112   0,                                    /* @nb_positive@ */
 113   0,                                    /* @nb_absolute@ */
 114   0,                                    /* @nb_nonzero@ */
 115   bytestring_pynot,                     /* @nb_invert@ */
 116   0,                                    /* @nb_lshift@ */
 117   0,                                    /* @nb_rshift@ */
 118   bytestring_pyand,                     /* @nb_and@ */
 119   bytestring_pyxor,                     /* @nb_xor@ */
 120   bytestring_pyor,                      /* @nb_or@ */
 121   0,                                    /* @nb_coerce@ */
 122   0,                                    /* @nb_int@ */
 123   0,                                    /* @nb_long@ */
 124   0,                                    /* @nb_float@ */
 125   0,                                    /* @nb_oct@ */
 126   0,                                    /* @nb_hex@ */
 127 };
 128
 129 static PyBufferProcs bytestring_pybuffer;
 130
 131 static PyTypeObject bytestring_pytype_skel = {
 132   PyObject_HEAD_INIT(0) 0,              /* Header */
 133   "ByteString",                         /* @tp_name@ */
 134   0,                                    /* @tp_basicsize@ */
 135   0,                                    /* @tp_itemsize@ */
 136
 137   0,                                    /* @tp_dealloc@ */
 138   0,                                    /* @tp_print@ */
 139   0,                                    /* @tp_getattr@ */
 140   0,                                    /* @tp_setattr@ */
 141   0,                                    /* @tp_compare@ */
 142   0,                                    /* @tp_repr@ */
 143   &bytestring_pynumber,                 /* @tp_as_number@ */
 144   0,                                    /* @tp_as_sequence@ */
 145   0,                                    /* @tp_as_mapping@ */
 146   0,                                    /* @tp_hash@ */
 147   0,                                    /* @tp_call@ */
 148   0,                                    /* @tp_str@ */
 149   0,                                    /* @tp_getattro@ */
 150   0,                                    /* @tp_setattro@ */
 151   &bytestring_pybuffer,                 /* @tp_as_buffer@ */
 152   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 153     Py_TPFLAGS_CHECKTYPES |
 154     Py_TPFLAGS_BASETYPE,
 155
 156   /* @tp_doc@ */
 157 "Byte string class.",
 158
 159   0,                                    /* @tp_traverse@ */
 160   0,                                    /* @tp_clear@ */
 161   0,                                    /* @tp_richcompare@ */
 162   0,                                    /* @tp_weaklistoffset@ */
 163   0,                                    /* @tp_iter@ */
 164   0,                                    /* @tp_iternext@ */
 165   0,                                    /* @tp_methods@ */
 166   0,                                    /* @tp_members@ */
 167   0,                                    /* @tp_getset@ */
 168   0,                                    /* @tp_base@ */
 169   0,                                    /* @tp_dict@ */
 170   0,                                    /* @tp_descr_get@ */
 171   0,                                    /* @tp_descr_set@ */
 172   0,                                    /* @tp_dictoffset@ */
 173   0,                                    /* @tp_init@ */
 174   PyType_GenericAlloc,                  /* @tp_alloc@ */
 175   bytestring_pynew,                     /* @tp_new@ */
 176   0,                                    /* @tp_free@ */
 177   0                                     /* @tp_is_gc@ */
 178 };
 179
 180 /*----- Initialization ----------------------------------------------------*/
 181
 182 #define string_pytype &PyString_Type
 183 void bytestring_pyinit(void)
 184 {
 185   INITTYPE(bytestring, string);
 186 }
 187
 188 void bytestring_pyinsert(PyObject *mod)
 189 {
 190   INSERT("ByteString", bytestring_pytype);
 191 }
 192
 193 /*----- That's all, folks -------------------------------------------------*/