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 {
40 static PyTypeObject *rbuf_pytype, *wbuf_pytype;
41 #define RBUF_PYCHECK(o) PyObject_TypeCheck((o), rbuf_pytype)
42 #define WBUF_PYCHECK(o) PyObject_TypeCheck((o), wbuf_pytype)
43 #define BUF_B(o) (&((buf_pyobj *)(o))->b)
45 /*----- Exceptions --------------------------------------------------------*/
47 static PyObject *buferr;
49 #define BUFERR() do { PyErr_SetNone(buferr); goto end; } while (0)
51 /*----- Read buffers ------------------------------------------------------*/
53 static PyObject *rbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
58 static char *kwlist[] = { "data", 0 };
60 if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", kwlist, &p, &n))
62 me = (buf_pyobj *)ty->tp_alloc(ty, 0);
65 buf_init(&me->b, q, n);
67 return ((PyObject *)me);
70 static void buf_pydealloc(PyObject *me)
71 { xfree(BBASE(BUF_B(me))); FREEOBJ(me); }
73 static int rbuf_pysegcount(PyObject *me, int *nn)
74 { if (nn) *nn = BSZ(BUF_B(me)); return (1); }
76 static int rbuf_pyreadbuf(PyObject *me, int seg, void **q)
77 { assert(seg == 0); *q = BBASE(BUF_B(me)); return (BSZ(BUF_B(me))); }
79 static PyObject *rbmeth_skip(PyObject *me, PyObject *arg)
83 if (!PyArg_ParseTuple(arg, "O&:skip", convszt, &n)) goto end;
84 if (!buf_get(BUF_B(me), n)) BUFERR();
90 static PyObject *rbmeth_get(PyObject *me, PyObject *arg)
95 if (!PyArg_ParseTuple(arg, "O&:get", convszt, &n)) goto end;
96 if ((p = buf_get(BUF_B(me), n)) == 0) BUFERR();
97 return (bytestring_pywrap(p, n));
102 #define RBMETH_GETU_(n, W, w) \
103 static PyObject *rbmeth_getu##w(PyObject *me, PyObject *arg) \
106 if (!PyArg_ParseTuple(arg, ":getu" #w)) goto end; \
107 if (buf_getu##w(BUF_B(me), &x)) BUFERR(); \
108 return (getu32(x)); \
112 DOUINTCONV(RBMETH_GETU_)
114 #define RBMETH_GETBLK_(n, W, w) \
115 static PyObject *rbmeth_getblk##w(PyObject *me, PyObject *arg) \
119 if (!PyArg_ParseTuple(arg, ":getblk" #w)) goto end; \
120 if ((q = buf_getmem##w(BUF_B(me), &sz)) == 0) BUFERR(); \
121 return (bytestring_pywrap(q, sz)); \
125 BUF_DOSUFFIXES(RBMETH_GETBLK_)
127 static PyObject *rbmeth_getmp(PyObject *me, PyObject *arg)
130 if (!PyArg_ParseTuple(arg, ":getmp")) goto end;
131 if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR();
132 return (mp_pywrap(x));
137 static PyObject *rbmeth_getgf(PyObject *me, PyObject *arg)
140 if (!PyArg_ParseTuple(arg, ":getgf")) goto end;
141 if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR();
142 return (gf_pywrap(x));
147 static PyObject *rbmeth_getecpt(PyObject *me, PyObject *arg, PyObject *kw)
149 PyObject *cobj = Py_None;
150 static char *kwlist[] = { "curve", 0 };
152 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O:getecpt", kwlist, &cobj))
154 if (cobj == Py_None) cobj = (PyObject *)ecpt_pytype;
155 if (!PyType_Check(cobj) ||
156 !PyType_IsSubtype((PyTypeObject *)cobj, ecpt_pytype))
157 TYERR("expected elliptic curve type");
158 if (buf_getec(BUF_B(me), &pt)) BUFERR();
159 return (ecpt_pywrapout(cobj, &pt));
164 static PyObject *rbmeth_getecptraw(PyObject *me, PyObject *arg)
166 PyTypeObject *cobj = ecpt_pytype;
168 if (!PyArg_ParseTuple(arg, "O!:getecptraw", eccurve_pytype, &cobj))
170 if (ec_getraw(ECCURVE_C(cobj), BUF_B(me), &pt)) BUFERR();
171 return (ecpt_pywrapout(cobj, &pt));
176 static PyObject *rbmeth_getge(PyObject *me, PyObject *arg)
180 if (!PyArg_ParseTuple(arg, "O!:getge", group_pytype, &gobj)) goto end;
181 x = G_CREATE(GROUP_G(gobj));
182 if (G_FROMBUF(GROUP_G(gobj), BUF_B(me), x)) BUFERR();
183 return (ge_pywrap(gobj, x));
185 if (x) G_DESTROY(GROUP_G(gobj), x);
189 static PyObject *rbmeth_getgeraw(PyObject *me, PyObject *arg)
193 if (!PyArg_ParseTuple(arg, "O!:getgeraw", group_pytype, &gobj)) goto end;
194 x = G_CREATE(GROUP_G(gobj));
195 if (G_FROMRAW(GROUP_G(gobj), BUF_B(me), x)) BUFERR();
196 return (ge_pywrap(gobj, x));
198 if (x) G_DESTROY(GROUP_G(gobj), x);
202 static PyObject *rbget_size(PyObject *me, void *hunoz)
203 { return (PyInt_FromLong(BSZ(BUF_B(me)))); }
204 static PyObject *rbget_left(PyObject *me, void *hunoz)
205 { return (PyInt_FromLong(BLEFT(BUF_B(me)))); }
206 static PyObject *rbget_endp(PyObject *me, void *hunoz)
207 { return (getbool(!BLEFT(BUF_B(me)))); }
209 static PyGetSetDef rbuf_pygetset[] = {
210 #define GETSETNAME(op, name) rb##op##_##name
211 GET (size, "RBUF.size -> SIZE")
212 GET (left, "RBUF.left -> REMAINDER")
213 GET (endp, "RBUF.endp -> BOOL")
218 static PyMethodDef rbuf_pymethods[] = {
219 #define METHNAME(func) rbmeth_##func
220 METH (skip, "RBUF.skip(N)")
221 METH (get, "RBUF.get(N) -> BYTES")
222 #define RBMETH_DECL_GETU_(n, W, w) \
223 METH(getu##w, "RBUF.getu" #w "() -> INT")
224 DOUINTCONV(RBMETH_DECL_GETU_)
225 #define RBMETH_DECL_GETBLK_(n, W, w) \
226 METH(getblk##w, "RBUF.getblk" #w "() -> INT")
227 BUF_DOSUFFIXES(RBMETH_DECL_GETBLK_)
228 METH (getmp, "RBUF.getmp() -> X")
229 METH (getgf, "RBUF.getgf() -> X")
230 KWMETH(getecpt, "RBUF.getecpt(curve = None) -> P")
231 METH (getecptraw, "RBUF.getecptraw(CURVE) -> P")
232 METH (getge, "RBUF.getge(GROUP) -> X")
233 METH (getgeraw, "RBUF.getgeraw(GROUP) -> X")
238 static PyBufferProcs rbuf_pybuffer = {
239 rbuf_pyreadbuf, /* @bf_getreadbuffer@ */
240 0, /* @bf_getwritebuffer@ */
241 rbuf_pysegcount, /* @bf_getsegcount@ */
242 0 /* @bf_getcharbuffer@ */
245 static PyTypeObject rbuf_pytype_skel = {
246 PyObject_HEAD_INIT(0) 0, /* Header */
247 "catacomb.ReadBuffer", /* @tp_name@ */
248 sizeof(buf_pyobj), /* @tp_basicsize@ */
249 0, /* @tp_itemsize@ */
251 buf_pydealloc, /* @tp_dealloc@ */
253 0, /* @tp_getattr@ */
254 0, /* @tp_setattr@ */
255 0, /* @tp_compare@ */
257 0, /* @tp_as_number@ */
258 0, /* @tp_as_sequence@ */
259 0, /* @tp_as_mapping@ */
263 0, /* @tp_getattro@ */
264 0, /* @tp_setattro@ */
265 &rbuf_pybuffer, /* @tp_as_buffer@ */
266 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
272 0, /* @tp_traverse@ */
274 0, /* @tp_richcompare@ */
275 0, /* @tp_weaklistoffset@ */
277 0, /* @tp_iternexr@ */
278 rbuf_pymethods, /* @tp_methods@ */
279 0, /* @tp_members@ */
280 rbuf_pygetset, /* @tp_getset@ */
283 0, /* @tp_descr_get@ */
284 0, /* @tp_descr_set@ */
285 0, /* @tp_dictoffset@ */
287 PyType_GenericAlloc, /* @tp_alloc@ */
288 rbuf_pynew, /* @tp_new@ */
293 /*----- Write buffers -----------------------------------------------------*/
295 static void ensure(PyObject *me, size_t n)
302 size_t want = BLEFT(b) + n;
303 while (nn < want) nn <<= 1;
304 p = xrealloc(BBASE(b), nn, BSZ(b));
305 BCUR(b) = p + BLEN(b);
311 static PyObject *wbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
316 static char *kwlist[] = { "size", 0 };
318 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:new", kwlist,
321 me = (buf_pyobj *)ty->tp_alloc(ty, 0);
323 buf_init(&me->b, p, n);
325 return ((PyObject *)me);
328 static int wbuf_pysegcount(PyObject *me, int *nn)
329 { if (nn) *nn = BLEN(BUF_B(me)); return (1); }
331 static int wbuf_pyreadbuf(PyObject *me, int seg, void **q)
332 { assert(seg == 0); *q = BBASE(BUF_B(me)); return (BLEN(BUF_B(me))); }
334 static PyObject *wbmeth_zero(PyObject *me, PyObject *arg)
338 if (!PyArg_ParseTuple(arg, "O&:zero", convszt, &n)) return (0);
340 p = buf_get(BUF_B(me), n); assert(p && BOK(BUF_B(me)));
345 static PyObject *wbmeth_put(PyObject *me, PyObject *arg)
349 if (!PyArg_ParseTuple(arg, "s#:put", &p, &n)) return (0);
351 buf_put(BUF_B(me), p, n); assert(BOK(BUF_B(m)));
355 #define WBMETH_PUTU_(n, W, w) \
356 static PyObject *wbmeth_putu##w(PyObject *me, PyObject *arg) \
359 if (!PyArg_ParseTuple(arg, "O&:putu" #w, convu##n, &i)) return (0); \
360 ensure(me, SZ_##n); \
361 buf_putu##w(BUF_B(me), i); assert(BOK(BUF_B(me))); \
364 DOUINTCONV(WBMETH_PUTU_)
367 #define WBMETH_PUTBLK_(n, W, w) \
368 static PyObject *wbmeth_putblk##w(PyObject *me, PyObject *arg) \
372 if (!PyArg_ParseTuple(arg, "s#:putblk" #w, &p, &sz)) return (0); \
373 ensure(me, sz + SZ_##n); \
374 buf_putmem##w(BUF_B(me), p, sz); assert(BOK(BUF_B(me))); \
377 BUF_DOSUFFIXES(WBMETH_PUTBLK_)
379 static PyObject *wbmeth_putmp(PyObject *me, PyObject *arg)
382 if (!PyArg_ParseTuple(arg, "O&:putmp", convmp, &x)) return (0);
383 ensure(me, mp_octets(x) + 2);
384 buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
388 static PyObject *wbmeth_putgf(PyObject *me, PyObject *arg)
391 if (!PyArg_ParseTuple(arg, "O&:putgf", convgf, &x)) return (0);
392 ensure(me, mp_octets(x) + 2);
393 buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
398 static PyObject *wbmeth_putecpt(PyObject *me, PyObject *arg)
401 if (!PyArg_ParseTuple(arg, "O&:putecpt", convecpt, &pt)) return (0);
402 if (EC_ATINF(&pt)) ensure(me, 2);
403 else ensure(me, 4 + mp_octets(pt.x) + mp_octets(pt.y));
404 buf_putec(BUF_B(me), &pt); assert(BOK(BUF_B(me)));
409 static PyObject *wbmeth_putecptraw(PyObject *me, PyObject *arg)
413 if (!PyArg_ParseTuple(arg, "O!:putecptraw", ecptcurve_pytype, &ptobj))
415 EC_OUT(ECPT_C(ptobj), &pt, ECPT_P(ptobj));
416 ensure(me, ECPT_C(ptobj)->f->noctets * 2 + 1);
417 ec_putraw(ECPT_C(ptobj), BUF_B(me), &pt); assert(BOK(BUF_B(me)));
422 static PyObject *wbmeth_putge(PyObject *me, PyObject *arg)
425 if (!PyArg_ParseTuple(arg, "O!:putge", ge_pytype, &geobj)) return (0);
426 ensure(me, GE_G(geobj)->noctets);
427 G_TOBUF(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
431 static PyObject *wbmeth_putgeraw(PyObject *me, PyObject *arg)
434 if (!PyArg_ParseTuple(arg, "O!:putgeraw", ge_pytype, &geobj)) return (0);
435 ensure(me, GE_G(geobj)->noctets);
436 G_TORAW(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
440 static PyObject *wbget_size(PyObject *me, void *hunoz)
441 { return (PyInt_FromLong(BLEN(BUF_B(me)))); }
443 static PyGetSetDef wbuf_pygetset[] = {
444 #define GETSETNAME(op, name) wb##op##_##name
445 GET (size, "WBUF.size -> SIZE")
450 static PyMethodDef wbuf_pymethods[] = {
451 #define METHNAME(func) wbmeth_##func
452 METH (zero, "WBUF.skip(N)")
453 METH (put, "WBUF.put(BYTES)")
454 #define WBMETH_DECL_PUTU_(n, W, w) \
455 METH(putu##w, "WBUF.putu" #w "(INT)")
456 DOUINTCONV(WBMETH_DECL_PUTU_)
457 #define WBMETH_DECL_PUTBLK_(n, W, w) \
458 METH(putblk##w, "WBUF.putblk" #w "(BYTES)")
459 BUF_DOSUFFIXES(WBMETH_DECL_PUTBLK_)
460 METH (putmp, "WBUF.putmp(X)")
461 METH (putgf, "WBUF.putgf(X)")
462 KWMETH(putecpt, "WBUF.putecpt(P)")
463 METH (putecptraw, "WBUF.putecptraw(P)")
464 METH (putge, "WBUF.putge(X)")
465 METH (putgeraw, "WBUF.putgeraw(X)")
470 static PyBufferProcs wbuf_pybuffer = {
471 wbuf_pyreadbuf, /* @bf_getreadbuffer@ */
472 0, /* @bf_getwritebuffer@ */
473 wbuf_pysegcount, /* @bf_getsegcount@ */
474 0 /* @bf_getcharbuffer@ */
477 static PyTypeObject wbuf_pytype_skel = {
478 PyObject_HEAD_INIT(0) 0, /* Header */
479 "catacomb.WriteBuffer", /* @tp_name@ */
480 sizeof(buf_pyobj), /* @tp_basicsize@ */
481 0, /* @tp_itemsize@ */
483 buf_pydealloc, /* @tp_dealloc@ */
485 0, /* @tp_getattr@ */
486 0, /* @tp_setattr@ */
487 0, /* @tp_compare@ */
489 0, /* @tp_as_number@ */
490 0, /* @tp_as_sequence@ */
491 0, /* @tp_as_mapping@ */
495 0, /* @tp_getattro@ */
496 0, /* @tp_setattro@ */
497 &wbuf_pybuffer, /* @tp_as_buffer@ */
498 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
504 0, /* @tp_traverse@ */
506 0, /* @tp_richcompare@ */
507 0, /* @tp_weaklistoffset@ */
509 0, /* @tp_iternexr@ */
510 wbuf_pymethods, /* @tp_methods@ */
511 0, /* @tp_members@ */
512 wbuf_pygetset, /* @tp_getset@ */
515 0, /* @tp_descr_get@ */
516 0, /* @tp_descr_set@ */
517 0, /* @tp_dictoffset@ */
519 PyType_GenericAlloc, /* @tp_alloc@ */
520 wbuf_pynew, /* @tp_new@ */
525 /*----- Initialization ----------------------------------------------------*/
527 void buffer_pyinit(void)
529 INITTYPE(rbuf, root);
530 INITTYPE(wbuf, root);
533 void buffer_pyinsert(PyObject *mod)
535 INSEXC("BufferError", buferr, PyExc_Exception, 0);
536 INSERT("ReadBuffer", rbuf_pytype);
537 INSERT("WriteBuffer", wbuf_pytype);
540 /*----- That's all, folks -------------------------------------------------*/