| 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 *empty, *bytev[256]; |
| 36 | |
| 37 | static PyObject *allocate(PyTypeObject *ty, size_t n) |
| 38 | { |
| 39 | PyStringObject *x; |
| 40 | x = (PyStringObject *)ty->tp_alloc(ty, n); |
| 41 | x->ob_sval[n] = 0; |
| 42 | #if defined(CACHE_HASH) || PY_VERSION_HEX >= 0x02030000 |
| 43 | x->ob_shash = -1; |
| 44 | #endif |
| 45 | x->ob_sstate = SSTATE_NOT_INTERNED; |
| 46 | return ((PyObject *)x); |
| 47 | } |
| 48 | |
| 49 | static PyObject *dowrap(PyTypeObject *ty, const void *p, size_t n) |
| 50 | { |
| 51 | PyObject *x; |
| 52 | int ch; |
| 53 | |
| 54 | if (p && ty == bytestring_pytype) { |
| 55 | if (!n) { |
| 56 | if (!empty) empty = allocate(ty, 0); |
| 57 | Py_INCREF(empty); return (empty); |
| 58 | } else if (n == 1 && (ch = *(unsigned char *)p) < sizeof(bytev)) { |
| 59 | if (!bytev[ch]) |
| 60 | { bytev[ch] = allocate(ty, 1); *PyString_AS_STRING(bytev[ch]) = ch; } |
| 61 | Py_INCREF(bytev[ch]); return (bytev[ch]); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | x = allocate(ty, n); |
| 66 | if (p) memcpy(PyString_AS_STRING(x), p, n); |
| 67 | return (x); |
| 68 | } |
| 69 | |
| 70 | PyObject *bytestring_pywrap(const void *p, size_t n) |
| 71 | { return (dowrap(bytestring_pytype, p, n)); } |
| 72 | |
| 73 | PyObject *bytestring_pywrapbuf(buf *b) |
| 74 | { return (dowrap(bytestring_pytype, BCUR(b), BLEFT(b))); } |
| 75 | |
| 76 | static PyObject *bytestring_pynew(PyTypeObject *ty, |
| 77 | PyObject *arg, PyObject *kw) |
| 78 | { |
| 79 | const char *p; |
| 80 | Py_ssize_t n; |
| 81 | static const char *const kwlist[] = { "data", 0 }; |
| 82 | if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &p, &n)) |
| 83 | return (0); |
| 84 | return (dowrap(ty, p, n)); |
| 85 | } |
| 86 | |
| 87 | static PyObject *meth_ctstreq(PyObject *me, PyObject *arg) |
| 88 | { |
| 89 | char *p, *q; |
| 90 | Py_ssize_t psz, qsz; |
| 91 | if (!PyArg_ParseTuple(arg, "s#s#:ctstreq", &p, &psz, &q, &qsz)) |
| 92 | goto end; |
| 93 | if (psz == qsz && ct_memeq(p, q, psz)) RETURN_TRUE; |
| 94 | else RETURN_FALSE; |
| 95 | end: |
| 96 | return (0); |
| 97 | } |
| 98 | |
| 99 | static PyObject *meth__ByteString_zero(PyObject *me, PyObject *arg) |
| 100 | { |
| 101 | size_t sz; |
| 102 | PyObject *rc = 0; |
| 103 | if (!PyArg_ParseTuple(arg, "OO&:zero", &me, convszt, &sz)) goto end; |
| 104 | rc = bytestring_pywrap(0, sz); |
| 105 | memset(PyString_AS_STRING(rc), 0, sz); |
| 106 | end: |
| 107 | return (rc); |
| 108 | } |
| 109 | |
| 110 | static PyObject *bytestring_pyrichcompare(PyObject *me, |
| 111 | PyObject *you, int op) |
| 112 | { |
| 113 | int b; |
| 114 | void *mystr, *yourstr; |
| 115 | Py_ssize_t mylen, yourlen, minlen; |
| 116 | |
| 117 | if (!PyString_Check(me) || !PyString_Check(you)) RETURN_NOTIMPL; |
| 118 | mystr = PyString_AS_STRING(me); mylen = PyString_GET_SIZE(me); |
| 119 | yourstr = PyString_AS_STRING(you); yourlen = PyString_GET_SIZE(you); |
| 120 | |
| 121 | switch (op) { |
| 122 | case Py_EQ: |
| 123 | b = mylen == yourlen && ct_memeq(mystr, yourstr, mylen); |
| 124 | break; |
| 125 | case Py_NE: |
| 126 | b = mylen != yourlen || !ct_memeq(mystr, yourstr, mylen); |
| 127 | break; |
| 128 | default: |
| 129 | minlen = mylen < yourlen ? mylen : yourlen; |
| 130 | b = memcmp(mystr, yourstr, minlen); |
| 131 | if (!b) b = mylen < yourlen ? -1 : mylen > yourlen ? +1 : 0; |
| 132 | switch (op) { |
| 133 | case Py_LT: b = b < 0; break; |
| 134 | case Py_LE: b = b <= 0; break; |
| 135 | case Py_GE: b = b >= 0; break; |
| 136 | case Py_GT: b = b > 0; break; |
| 137 | default: abort(); |
| 138 | } |
| 139 | } |
| 140 | if (b) RETURN_TRUE; |
| 141 | else RETURN_FALSE; |
| 142 | } |
| 143 | |
| 144 | static PyObject *bytestring_pyconcat(PyObject *x, PyObject *y) |
| 145 | { |
| 146 | const void *xv; Py_ssize_t xsz; |
| 147 | const void *yv; Py_ssize_t ysz; |
| 148 | PyObject *z = 0; char *zp; size_t zsz; |
| 149 | |
| 150 | if (PyObject_AsReadBuffer(x, &xv, &xsz) || |
| 151 | PyObject_AsReadBuffer(y, &yv, &ysz)) |
| 152 | goto end; |
| 153 | zsz = (size_t)xsz + (size_t)ysz; |
| 154 | if (xsz < 0 || ysz < 0 || zsz < xsz) VALERR("too long"); |
| 155 | z = bytestring_pywrap(0, zsz); zp = PyString_AS_STRING(z); |
| 156 | memcpy(zp, xv, xsz); memcpy(zp + xsz, yv, ysz); |
| 157 | end: |
| 158 | return (z); |
| 159 | } |
| 160 | |
| 161 | static PyObject *bytestring_pyrepeat(PyObject *me, Py_ssize_t n) |
| 162 | { |
| 163 | const unsigned char *xp; size_t xsz; |
| 164 | PyObject *z = 0; char *zp; size_t zsz; |
| 165 | |
| 166 | xp = (const unsigned char *)PyString_AS_STRING(me); |
| 167 | xsz = PyString_GET_SIZE(me); |
| 168 | if (n < 0 || (n && xsz >= (size_t)-1/n)) VALERR("too long"); |
| 169 | zsz = n*xsz; z = bytestring_pywrap(0, zsz); zp = PyString_AS_STRING(z); |
| 170 | if (xsz == 1) memset(zp, *xp, zsz); |
| 171 | else while (zsz) { memcpy(zp, xp, xsz); zp += xsz; zsz -= xsz; } |
| 172 | end: |
| 173 | return (z); |
| 174 | } |
| 175 | |
| 176 | static PyObject *bytestring_pyitem(PyObject *me, Py_ssize_t i) |
| 177 | { |
| 178 | PyObject *rc = 0; |
| 179 | |
| 180 | if (i < 0 || i >= PyString_GET_SIZE(me)) IXERR("out of range"); |
| 181 | rc = bytestring_pywrap(PyString_AS_STRING(me) + i, 1); |
| 182 | end: |
| 183 | return (rc); |
| 184 | } |
| 185 | |
| 186 | static PyObject *bytestring_pyslice(PyObject *me, Py_ssize_t i, Py_ssize_t j) |
| 187 | { |
| 188 | PyObject *rc = 0; |
| 189 | size_t n = PyString_GET_SIZE(me); |
| 190 | |
| 191 | if (i < 0) i = 0; |
| 192 | if (j < 0) j = 0; |
| 193 | else if (j > n) j = n; |
| 194 | if (j < i) i = j = 0; |
| 195 | if (i == 0 && j == n && me->ob_type == bytestring_pytype) |
| 196 | { Py_INCREF(me); rc = me; goto end; } |
| 197 | rc = bytestring_pywrap(PyString_AS_STRING(me) + i, j - i); |
| 198 | end: |
| 199 | return (rc); |
| 200 | } |
| 201 | |
| 202 | static PyObject *bytestring_pysubscript(PyObject *me, PyObject *ix) |
| 203 | { |
| 204 | Py_ssize_t i, j, k, n; |
| 205 | const unsigned char *p; |
| 206 | unsigned char *q; |
| 207 | PyObject *rc = 0; |
| 208 | |
| 209 | if (PyIndex_Check(ix)) { |
| 210 | i = PyNumber_AsSsize_t(ix, PyExc_IndexError); |
| 211 | if (i == -1 && PyErr_Occurred()) return (0); |
| 212 | if (i < 0) i += PyString_GET_SIZE(me); |
| 213 | rc = bytestring_pyitem(me, i); |
| 214 | } else if (PySlice_Check(ix)) { |
| 215 | if (PySlice_GetIndicesEx((PySliceObject *)ix, PyString_GET_SIZE(me), |
| 216 | &i, &j, &k, &n)) |
| 217 | return (0); |
| 218 | if (k == 1) return bytestring_pyslice(me, i, j); |
| 219 | rc = bytestring_pywrap(0, n); |
| 220 | p = (unsigned char *)PyString_AS_STRING(me) + i; |
| 221 | q = (unsigned char *)PyString_AS_STRING(rc); |
| 222 | while (n--) { *q++ = *p; p += k; } |
| 223 | } else |
| 224 | TYERR("wanted integer or slice"); |
| 225 | end: |
| 226 | return (rc); |
| 227 | } |
| 228 | |
| 229 | #define BINOP(name, op) \ |
| 230 | static PyObject *bytestring_py##name(PyObject *x, PyObject *y) { \ |
| 231 | const void *xv, *yv; \ |
| 232 | const unsigned char *xp, *yp; \ |
| 233 | unsigned char *zp; \ |
| 234 | Py_ssize_t xsz, ysz; \ |
| 235 | int i; \ |
| 236 | PyObject *rc = 0; \ |
| 237 | if (PyObject_AsReadBuffer(x, &xv, &xsz) || \ |
| 238 | PyObject_AsReadBuffer(y, &yv, &ysz)) \ |
| 239 | goto end; \ |
| 240 | if (xsz != ysz) VALERR("length mismatch"); \ |
| 241 | rc = bytestring_pywrap(0, xsz); \ |
| 242 | xp = xv; yp = yv; zp = (unsigned char *)PyString_AS_STRING(rc); \ |
| 243 | for (i = xsz; i > 0; i--) *zp++ = *xp++ op *yp++; \ |
| 244 | end: \ |
| 245 | return (rc); \ |
| 246 | } |
| 247 | BINOP(and, &) |
| 248 | BINOP(or, |) |
| 249 | BINOP(xor, ^) |
| 250 | |
| 251 | #define UNOP(name, op) \ |
| 252 | static PyObject *bytestring_py##name(PyObject *x) { \ |
| 253 | const void *xv; \ |
| 254 | const unsigned char *xp; \ |
| 255 | unsigned char *zp; \ |
| 256 | Py_ssize_t xsz; \ |
| 257 | int i; \ |
| 258 | PyObject *rc = 0; \ |
| 259 | if (PyObject_AsReadBuffer(x, &xv, &xsz)) goto end; \ |
| 260 | rc = bytestring_pywrap(0, xsz); \ |
| 261 | xp = xv; zp = (unsigned char *)PyString_AS_STRING(rc); \ |
| 262 | for (i = xsz; i > 0; i--) *zp++ = op *xp++; \ |
| 263 | end: \ |
| 264 | return (rc); \ |
| 265 | } |
| 266 | UNOP(not, ~) |
| 267 | |
| 268 | static PyNumberMethods bytestring_pynumber = { |
| 269 | 0, /* @nb_add@ */ |
| 270 | 0, /* @nb_subtract@ */ |
| 271 | 0, /* @nb_multiply@ */ |
| 272 | 0, /* @nb_divide@ */ |
| 273 | 0, /* @nb_remainder@ */ |
| 274 | 0, /* @nb_divmod@ */ |
| 275 | 0, /* @nb_power@ */ |
| 276 | 0, /* @nb_negative@ */ |
| 277 | 0, /* @nb_positive@ */ |
| 278 | 0, /* @nb_absolute@ */ |
| 279 | 0, /* @nb_nonzero@ */ |
| 280 | bytestring_pynot, /* @nb_invert@ */ |
| 281 | 0, /* @nb_lshift@ */ |
| 282 | 0, /* @nb_rshift@ */ |
| 283 | bytestring_pyand, /* @nb_and@ */ |
| 284 | bytestring_pyxor, /* @nb_xor@ */ |
| 285 | bytestring_pyor, /* @nb_or@ */ |
| 286 | 0, /* @nb_coerce@ */ |
| 287 | 0, /* @nb_int@ */ |
| 288 | 0, /* @nb_long@ */ |
| 289 | 0, /* @nb_float@ */ |
| 290 | 0, /* @nb_oct@ */ |
| 291 | 0, /* @nb_hex@ */ |
| 292 | }; |
| 293 | |
| 294 | static PySequenceMethods bytestring_pysequence = { |
| 295 | 0, /* @sq_length@ */ |
| 296 | bytestring_pyconcat, /* @sq_concat@ */ |
| 297 | bytestring_pyrepeat, /* @sq_repeat@ */ |
| 298 | bytestring_pyitem, /* @sq_item@ */ |
| 299 | bytestring_pyslice, /* @sq_slice@ */ |
| 300 | 0, /* @sq_ass_item@ */ |
| 301 | 0, /* @sq_ass_slice@ */ |
| 302 | 0, /* @sq_contains@ */ |
| 303 | 0, /* @sq_inplace_concat@ */ |
| 304 | 0, /* @sq_inplace_repeat@ */ |
| 305 | }; |
| 306 | |
| 307 | static PyMappingMethods bytestring_pymapping = { |
| 308 | 0, /* @mp_length@ */ |
| 309 | bytestring_pysubscript, /* @mp_subscript@ */ |
| 310 | 0, /* @mp_ass_subscript@ */ |
| 311 | }; |
| 312 | |
| 313 | static PyBufferProcs bytestring_pybuffer; |
| 314 | |
| 315 | static PyTypeObject bytestring_pytype_skel = { |
| 316 | PyObject_HEAD_INIT(0) 0, /* Header */ |
| 317 | "ByteString", /* @tp_name@ */ |
| 318 | 0, /* @tp_basicsize@ */ |
| 319 | 0, /* @tp_itemsize@ */ |
| 320 | |
| 321 | 0, /* @tp_dealloc@ */ |
| 322 | 0, /* @tp_print@ */ |
| 323 | 0, /* @tp_getattr@ */ |
| 324 | 0, /* @tp_setattr@ */ |
| 325 | 0, /* @tp_compare@ */ |
| 326 | 0, /* @tp_repr@ */ |
| 327 | &bytestring_pynumber, /* @tp_as_number@ */ |
| 328 | &bytestring_pysequence, /* @tp_as_sequence@ */ |
| 329 | &bytestring_pymapping, /* @tp_as_mapping@ */ |
| 330 | 0, /* @tp_hash@ */ |
| 331 | 0, /* @tp_call@ */ |
| 332 | 0, /* @tp_str@ */ |
| 333 | 0, /* @tp_getattro@ */ |
| 334 | 0, /* @tp_setattro@ */ |
| 335 | &bytestring_pybuffer, /* @tp_as_buffer@ */ |
| 336 | Py_TPFLAGS_DEFAULT | /* @tp_flags@ */ |
| 337 | Py_TPFLAGS_CHECKTYPES | |
| 338 | Py_TPFLAGS_BASETYPE, |
| 339 | |
| 340 | /* @tp_doc@ */ |
| 341 | "ByteString(STR): byte string class.", |
| 342 | |
| 343 | 0, /* @tp_traverse@ */ |
| 344 | 0, /* @tp_clear@ */ |
| 345 | bytestring_pyrichcompare, /* @tp_richcompare@ */ |
| 346 | 0, /* @tp_weaklistoffset@ */ |
| 347 | 0, /* @tp_iter@ */ |
| 348 | 0, /* @tp_iternext@ */ |
| 349 | 0, /* @tp_methods@ */ |
| 350 | 0, /* @tp_members@ */ |
| 351 | 0, /* @tp_getset@ */ |
| 352 | 0, /* @tp_base@ */ |
| 353 | 0, /* @tp_dict@ */ |
| 354 | 0, /* @tp_descr_get@ */ |
| 355 | 0, /* @tp_descr_set@ */ |
| 356 | 0, /* @tp_dictoffset@ */ |
| 357 | 0, /* @tp_init@ */ |
| 358 | PyType_GenericAlloc, /* @tp_alloc@ */ |
| 359 | bytestring_pynew, /* @tp_new@ */ |
| 360 | 0, /* @tp_free@ */ |
| 361 | 0 /* @tp_is_gc@ */ |
| 362 | }; |
| 363 | |
| 364 | /*----- Initialization ----------------------------------------------------*/ |
| 365 | |
| 366 | static PyMethodDef methods[] = { |
| 367 | #define METHNAME(func) meth_##func |
| 368 | METH (ctstreq, "ctstreq(S, T) -> BOOL") |
| 369 | METH (_ByteString_zero, "zero(N) -> 0000...00") |
| 370 | #undef METHNAME |
| 371 | { 0 } |
| 372 | }; |
| 373 | |
| 374 | #define string_pytype &PyString_Type |
| 375 | void bytestring_pyinit(void) |
| 376 | { |
| 377 | INITTYPE(bytestring, string); |
| 378 | addmethods(methods); |
| 379 | } |
| 380 | |
| 381 | void bytestring_pyinsert(PyObject *mod) |
| 382 | { |
| 383 | INSERT("ByteString", bytestring_pytype); |
| 384 | } |
| 385 | |
| 386 | /*----- That's all, folks -------------------------------------------------*/ |