5 * Reading and writing buffers of stuff
7 * (c) 2005 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the Python interface to Catacomb.
14 * Catacomb/Python is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * Catacomb/Python is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with Catacomb/Python; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Header files ------------------------------------------------------*/
31 #include "catacomb-python.h"
33 /*----- Data structures ---------------------------------------------------*/
35 typedef struct buf_pyobj
{
41 static PyTypeObject
*rbuf_pytype
, *wbuf_pytype
;
42 #define RBUF_PYCHECK(o) PyObject_TypeCheck((o), rbuf_pytype)
43 #define WBUF_PYCHECK(o) PyObject_TypeCheck((o), wbuf_pytype)
44 #define BUF_B(o) (&((buf_pyobj *)(o))->b)
45 #define BUF_SUB(o) (((buf_pyobj *)(o))->sub)
47 /*----- Exceptions --------------------------------------------------------*/
49 static PyObject
*buferr
;
51 #define BUFERR() do { PyErr_SetNone(buferr); goto end; } while (0)
53 /*----- Read buffers ------------------------------------------------------*/
55 static PyObject
*rbuf_pynew(PyTypeObject
*ty
, PyObject
*arg
, PyObject
*kw
)
60 static char *kwlist
[] = { "data", 0 };
62 if (!PyArg_ParseTupleAndKeywords(arg
, kw
, "s#:new", kwlist
, &p
, &n
))
66 me
= (buf_pyobj
*)ty
->tp_alloc(ty
, 0);
68 buf_init(&me
->b
, q
, n
);
70 return ((PyObject
*)me
);
73 static void buf_pydealloc(PyObject
*me
)
76 Py_DECREF(BUF_SUB(me
));
78 xfree(BBASE(BUF_B(me
)));
82 static int rbuf_pysegcount(PyObject
*me
, int *nn
)
83 { if (nn
) *nn
= BSZ(BUF_B(me
)); return (1); }
85 static int rbuf_pyreadbuf(PyObject
*me
, int seg
, void **q
)
86 { assert(seg
== 0); *q
= BCUR(BUF_B(me
)); return (BLEFT(BUF_B(me
))); }
88 static PyObject
*rbmeth_skip(PyObject
*me
, PyObject
*arg
)
92 if (!PyArg_ParseTuple(arg
, "O&:skip", convszt
, &n
)) goto end
;
93 if (!buf_get(BUF_B(me
), n
)) BUFERR();
99 static PyObject
*rbmeth_get(PyObject
*me
, PyObject
*arg
)
104 if (!PyArg_ParseTuple(arg
, "O&:get", convszt
, &n
)) goto end
;
105 if ((p
= buf_get(BUF_B(me
), n
)) == 0) BUFERR();
106 return (bytestring_pywrap(p
, n
));
111 #define RBMETH_GETU_(n, W, w) \
112 static PyObject *rbmeth_getu##w(PyObject *me, PyObject *arg) \
115 if (!PyArg_ParseTuple(arg, ":getu" #w)) goto end; \
116 if (buf_getu##w(BUF_B(me), &x)) BUFERR(); \
117 return (getulong(x)); \
121 DOUINTCONV(RBMETH_GETU_
)
123 #define RBMETH_GETBLK_(n, W, w) \
124 static PyObject *rbmeth_getblk##w(PyObject *me, PyObject *arg) \
128 if (!PyArg_ParseTuple(arg, ":getblk" #w)) goto end; \
129 if ((q = buf_getmem##w(BUF_B(me), &sz)) == 0) BUFERR(); \
130 return (bytestring_pywrap(q, sz)); \
134 BUF_DOSUFFIXES(RBMETH_GETBLK_
)
136 #define RBMETH_GETBUF_(n, W, w) \
137 static PyObject *rbmeth_getbuf##w(PyObject *me, PyObject *arg) \
141 if (!PyArg_ParseTuple(arg, ":getbuf" #w)) goto end; \
142 if (buf_getbuf##w(BUF_B(me), &bb)) BUFERR(); \
143 b = PyObject_NEW(buf_pyobj, rbuf_pytype); \
147 return ((PyObject *)b); \
151 BUF_DOSUFFIXES(RBMETH_GETBUF_
)
153 static PyObject
*rbmeth_getmp(PyObject
*me
, PyObject
*arg
)
156 if (!PyArg_ParseTuple(arg
, ":getmp")) goto end
;
157 if ((x
= buf_getmp(BUF_B(me
))) == 0) BUFERR();
158 return (mp_pywrap(x
));
163 static PyObject
*rbmeth_getgf(PyObject
*me
, PyObject
*arg
)
166 if (!PyArg_ParseTuple(arg
, ":getgf")) goto end
;
167 if ((x
= buf_getmp(BUF_B(me
))) == 0) BUFERR();
168 return (gf_pywrap(x
));
173 static PyObject
*rbmeth_getecpt(PyObject
*me
, PyObject
*arg
, PyObject
*kw
)
175 PyObject
*cobj
= Py_None
;
176 static char *kwlist
[] = { "curve", 0 };
178 if (!PyArg_ParseTupleAndKeywords(arg
, kw
, "|O:getecpt", kwlist
, &cobj
))
180 if (cobj
== Py_None
) cobj
= (PyObject
*)ecpt_pytype
;
181 if (!PyType_Check(cobj
) ||
182 !PyType_IsSubtype((PyTypeObject
*)cobj
, ecpt_pytype
))
183 TYERR("expected elliptic curve type");
184 if (buf_getec(BUF_B(me
), &pt
)) BUFERR();
185 return (ecpt_pywrapout(cobj
, &pt
));
190 static PyObject
*rbmeth_getecptraw(PyObject
*me
, PyObject
*arg
)
192 PyTypeObject
*cobj
= ecpt_pytype
;
194 if (!PyArg_ParseTuple(arg
, "O!:getecptraw", eccurve_pytype
, &cobj
))
196 if (ec_getraw(ECCURVE_C(cobj
), BUF_B(me
), &pt
)) BUFERR();
197 return (ecpt_pywrapout(cobj
, &pt
));
202 static PyObject
*rbmeth_getge(PyObject
*me
, PyObject
*arg
)
206 if (!PyArg_ParseTuple(arg
, "O!:getge", group_pytype
, &gobj
)) goto end
;
207 x
= G_CREATE(GROUP_G(gobj
));
208 if (G_FROMBUF(GROUP_G(gobj
), BUF_B(me
), x
)) BUFERR();
209 return (ge_pywrap(gobj
, x
));
211 if (x
) G_DESTROY(GROUP_G(gobj
), x
);
215 static PyObject
*rbmeth_getgeraw(PyObject
*me
, PyObject
*arg
)
219 if (!PyArg_ParseTuple(arg
, "O!:getgeraw", group_pytype
, &gobj
)) goto end
;
220 x
= G_CREATE(GROUP_G(gobj
));
221 if (G_FROMRAW(GROUP_G(gobj
), BUF_B(me
), x
)) BUFERR();
222 return (ge_pywrap(gobj
, x
));
224 if (x
) G_DESTROY(GROUP_G(gobj
), x
);
228 static PyObject
*rbget_size(PyObject
*me
, void *hunoz
)
229 { return (PyInt_FromLong(BSZ(BUF_B(me
)))); }
230 static PyObject
*rbget_left(PyObject
*me
, void *hunoz
)
231 { return (PyInt_FromLong(BLEFT(BUF_B(me
)))); }
232 static PyObject
*rbget_endp(PyObject
*me
, void *hunoz
)
233 { return (getbool(!BLEFT(BUF_B(me
)))); }
234 static PyObject
*rbget_offset(PyObject
*me
, void *hunoz
)
235 { return (PyInt_FromLong(BLEN(BUF_B(me
)))); }
236 static int rbset_offset(PyObject
*me
, PyObject
*x
, void *hunoz
)
239 if (!x
) NIERR("__del__");
240 if (!convszt(x
, &n
)) goto end
;
241 if (n
> BSZ(BUF_B(me
))) VALERR("out of range");
242 BCUR(BUF_B(me
)) = BBASE(BUF_B(me
)) + n
;
248 static PyGetSetDef rbuf_pygetset
[] = {
249 #define GETSETNAME(op, name) rb##op##_##name
250 GET (size
, "RBUF.size -> SIZE")
251 GET (left
, "RBUF.left -> REMAINDER")
252 GET (endp
, "RBUF.endp -> BOOL")
253 GETSET(offset
, "RBUF.offset -> OFFSET")
258 static PyMethodDef rbuf_pymethods
[] = {
259 #define METHNAME(func) rbmeth_##func
260 METH (skip
, "RBUF.skip(N)")
261 METH (get
, "RBUF.get(N) -> BYTES")
262 #define RBMETH_DECL_GETU_(n, W, w) \
263 METH(getu##w, "RBUF.getu" #w "() -> INT")
264 DOUINTCONV(RBMETH_DECL_GETU_
)
265 #define RBMETH_DECL_GETBLK_(n, W, w) \
266 METH(getblk##w, "RBUF.getblk" #w "() -> INT")
267 BUF_DOSUFFIXES(RBMETH_DECL_GETBLK_
)
268 #define RBMETH_DECL_GETBUF_(n, W, w) \
269 METH(getbuf##w, "RBUF.getbuf" #w "() -> INT")
270 BUF_DOSUFFIXES(RBMETH_DECL_GETBUF_
)
271 METH (getmp
, "RBUF.getmp() -> X")
272 METH (getgf
, "RBUF.getgf() -> X")
273 KWMETH(getecpt
, "RBUF.getecpt(curve = None) -> P")
274 METH (getecptraw
, "RBUF.getecptraw(CURVE) -> P")
275 METH (getge
, "RBUF.getge(GROUP) -> X")
276 METH (getgeraw
, "RBUF.getgeraw(GROUP) -> X")
281 static PyBufferProcs rbuf_pybuffer
= {
282 rbuf_pyreadbuf
, /* @bf_getreadbuffer@ */
283 0, /* @bf_getwritebuffer@ */
284 rbuf_pysegcount
, /* @bf_getsegcount@ */
285 0 /* @bf_getcharbuffer@ */
288 static PyTypeObject rbuf_pytype_skel
= {
289 PyObject_HEAD_INIT(0) 0, /* Header */
290 "catacomb.ReadBuffer", /* @tp_name@ */
291 sizeof(buf_pyobj
), /* @tp_basicsize@ */
292 0, /* @tp_itemsize@ */
294 buf_pydealloc
, /* @tp_dealloc@ */
296 0, /* @tp_getattr@ */
297 0, /* @tp_setattr@ */
298 0, /* @tp_compare@ */
300 0, /* @tp_as_number@ */
301 0, /* @tp_as_sequence@ */
302 0, /* @tp_as_mapping@ */
306 0, /* @tp_getattro@ */
307 0, /* @tp_setattro@ */
308 &rbuf_pybuffer
, /* @tp_as_buffer@ */
309 Py_TPFLAGS_DEFAULT
| /* @tp_flags@ */
315 0, /* @tp_traverse@ */
317 0, /* @tp_richcompare@ */
318 0, /* @tp_weaklistoffset@ */
320 0, /* @tp_iternext@ */
321 rbuf_pymethods
, /* @tp_methods@ */
322 0, /* @tp_members@ */
323 rbuf_pygetset
, /* @tp_getset@ */
326 0, /* @tp_descr_get@ */
327 0, /* @tp_descr_set@ */
328 0, /* @tp_dictoffset@ */
330 PyType_GenericAlloc
, /* @tp_alloc@ */
331 rbuf_pynew
, /* @tp_new@ */
336 /*----- Write buffers -----------------------------------------------------*/
338 static void ensure(PyObject
*me
, size_t n
)
345 size_t want
= BLEFT(b
) + n
;
346 while (nn
< want
) nn
<<= 1;
347 p
= xrealloc(BBASE(b
), nn
, BSZ(b
));
348 BCUR(b
) = p
+ BLEN(b
);
354 static PyObject
*wbuf_pynew(PyTypeObject
*ty
, PyObject
*arg
, PyObject
*kw
)
359 static char *kwlist
[] = { "size", 0 };
361 if (!PyArg_ParseTupleAndKeywords(arg
, kw
, "|O&:new", kwlist
,
364 me
= (buf_pyobj
*)ty
->tp_alloc(ty
, 0);
367 buf_init(&me
->b
, p
, n
);
369 return ((PyObject
*)me
);
372 static int wbuf_pysegcount(PyObject
*me
, int *nn
)
373 { if (nn
) *nn
= BLEN(BUF_B(me
)); return (1); }
375 static int wbuf_pyreadbuf(PyObject
*me
, int seg
, void **q
)
376 { assert(seg
== 0); *q
= BBASE(BUF_B(me
)); return (BLEN(BUF_B(me
))); }
378 static PyObject
*wbmeth_zero(PyObject
*me
, PyObject
*arg
)
382 if (!PyArg_ParseTuple(arg
, "O&:zero", convszt
, &n
)) return (0);
384 p
= buf_get(BUF_B(me
), n
); assert(p
&& BOK(BUF_B(me
)));
389 static PyObject
*wbmeth_put(PyObject
*me
, PyObject
*arg
)
393 if (!PyArg_ParseTuple(arg
, "s#:put", &p
, &n
)) return (0);
395 buf_put(BUF_B(me
), p
, n
); assert(BOK(BUF_B(m
)));
399 #define WBMETH_PUTU_(n, W, w) \
400 static PyObject *wbmeth_putu##w(PyObject *me, PyObject *arg) \
403 if (!PyArg_ParseTuple(arg, "O&:putu" #w, convu##n, &i)) return (0); \
404 ensure(me, SZ_##n); \
405 buf_putu##w(BUF_B(me), i); assert(BOK(BUF_B(me))); \
408 DOUINTCONV(WBMETH_PUTU_
)
411 #define WBMETH_PUTBLK_(n, W, w) \
412 static PyObject *wbmeth_putblk##w(PyObject *me, PyObject *arg) \
416 if (!PyArg_ParseTuple(arg, "s#:putblk" #w, &p, &sz)) return (0); \
417 ensure(me, sz + SZ_##n); \
418 buf_putmem##w(BUF_B(me), p, sz); assert(BOK(BUF_B(me))); \
421 BUF_DOSUFFIXES(WBMETH_PUTBLK_
)
423 static PyObject
*wbmeth_putmp(PyObject
*me
, PyObject
*arg
)
426 if (!PyArg_ParseTuple(arg
, "O&:putmp", convmp
, &x
)) return (0);
427 ensure(me
, mp_octets(x
) + 2);
428 buf_putmp(BUF_B(me
), x
); assert(BOK(BUF_B(me
)));
432 static PyObject
*wbmeth_putgf(PyObject
*me
, PyObject
*arg
)
435 if (!PyArg_ParseTuple(arg
, "O&:putgf", convgf
, &x
)) return (0);
436 ensure(me
, mp_octets(x
) + 2);
437 buf_putmp(BUF_B(me
), x
); assert(BOK(BUF_B(me
)));
442 static PyObject
*wbmeth_putecpt(PyObject
*me
, PyObject
*arg
)
445 if (!PyArg_ParseTuple(arg
, "O&:putecpt", convecpt
, &pt
)) return (0);
446 if (EC_ATINF(&pt
)) ensure(me
, 2);
447 else ensure(me
, 4 + mp_octets(pt
.x
) + mp_octets(pt
.y
));
448 buf_putec(BUF_B(me
), &pt
); assert(BOK(BUF_B(me
)));
453 static PyObject
*wbmeth_putecptraw(PyObject
*me
, PyObject
*arg
)
457 if (!PyArg_ParseTuple(arg
, "O!:putecptraw", ecptcurve_pytype
, &ptobj
))
459 EC_OUT(ECPT_C(ptobj
), &pt
, ECPT_P(ptobj
));
460 ensure(me
, ECPT_C(ptobj
)->f
->noctets
* 2 + 1);
461 ec_putraw(ECPT_C(ptobj
), BUF_B(me
), &pt
); assert(BOK(BUF_B(me
)));
466 static PyObject
*wbmeth_putge(PyObject
*me
, PyObject
*arg
)
469 if (!PyArg_ParseTuple(arg
, "O!:putge", ge_pytype
, &geobj
)) return (0);
470 ensure(me
, GE_G(geobj
)->noctets
);
471 G_TOBUF(GE_G(geobj
), BUF_B(me
), GE_X(geobj
)); assert(BOK(BUF_B(me
)));
475 static PyObject
*wbmeth_putgeraw(PyObject
*me
, PyObject
*arg
)
478 if (!PyArg_ParseTuple(arg
, "O!:putgeraw", ge_pytype
, &geobj
)) return (0);
479 ensure(me
, GE_G(geobj
)->noctets
);
480 G_TORAW(GE_G(geobj
), BUF_B(me
), GE_X(geobj
)); assert(BOK(BUF_B(me
)));
484 static PyObject
*wbget_size(PyObject
*me
, void *hunoz
)
485 { return (PyInt_FromLong(BLEN(BUF_B(me
)))); }
487 static PyGetSetDef wbuf_pygetset
[] = {
488 #define GETSETNAME(op, name) wb##op##_##name
489 GET (size
, "WBUF.size -> SIZE")
494 static PyMethodDef wbuf_pymethods
[] = {
495 #define METHNAME(func) wbmeth_##func
496 METH (zero
, "WBUF.skip(N)")
497 METH (put
, "WBUF.put(BYTES)")
498 #define WBMETH_DECL_PUTU_(n, W, w) \
499 METH(putu##w, "WBUF.putu" #w "(INT)")
500 DOUINTCONV(WBMETH_DECL_PUTU_
)
501 #define WBMETH_DECL_PUTBLK_(n, W, w) \
502 METH(putblk##w, "WBUF.putblk" #w "(BYTES)")
503 BUF_DOSUFFIXES(WBMETH_DECL_PUTBLK_
)
504 METH (putmp
, "WBUF.putmp(X)")
505 METH (putgf
, "WBUF.putgf(X)")
506 KWMETH(putecpt
, "WBUF.putecpt(P)")
507 METH (putecptraw
, "WBUF.putecptraw(P)")
508 METH (putge
, "WBUF.putge(X)")
509 METH (putgeraw
, "WBUF.putgeraw(X)")
514 static PyBufferProcs wbuf_pybuffer
= {
515 wbuf_pyreadbuf
, /* @bf_getreadbuffer@ */
516 0, /* @bf_getwritebuffer@ */
517 wbuf_pysegcount
, /* @bf_getsegcount@ */
518 0 /* @bf_getcharbuffer@ */
521 static PyTypeObject wbuf_pytype_skel
= {
522 PyObject_HEAD_INIT(0) 0, /* Header */
523 "catacomb.WriteBuffer", /* @tp_name@ */
524 sizeof(buf_pyobj
), /* @tp_basicsize@ */
525 0, /* @tp_itemsize@ */
527 buf_pydealloc
, /* @tp_dealloc@ */
529 0, /* @tp_getattr@ */
530 0, /* @tp_setattr@ */
531 0, /* @tp_compare@ */
533 0, /* @tp_as_number@ */
534 0, /* @tp_as_sequence@ */
535 0, /* @tp_as_mapping@ */
539 0, /* @tp_getattro@ */
540 0, /* @tp_setattro@ */
541 &wbuf_pybuffer
, /* @tp_as_buffer@ */
542 Py_TPFLAGS_DEFAULT
| /* @tp_flags@ */
548 0, /* @tp_traverse@ */
550 0, /* @tp_richcompare@ */
551 0, /* @tp_weaklistoffset@ */
553 0, /* @tp_iternext@ */
554 wbuf_pymethods
, /* @tp_methods@ */
555 0, /* @tp_members@ */
556 wbuf_pygetset
, /* @tp_getset@ */
559 0, /* @tp_descr_get@ */
560 0, /* @tp_descr_set@ */
561 0, /* @tp_dictoffset@ */
563 PyType_GenericAlloc
, /* @tp_alloc@ */
564 wbuf_pynew
, /* @tp_new@ */
569 /*----- Initialization ----------------------------------------------------*/
571 void buffer_pyinit(void)
573 INITTYPE(rbuf
, root
);
574 INITTYPE(wbuf
, root
);
577 void buffer_pyinsert(PyObject
*mod
)
579 INSEXC("BufferError", buferr
, PyExc_Exception
, 0);
580 INSERT("ReadBuffer", rbuf_pytype
);
581 INSERT("WriteBuffer", wbuf_pytype
);
584 /*----- That's all, folks -------------------------------------------------*/