3 * Reading and writing buffers of stuff
5 * (c) 2005 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of the Python interface to Catacomb.
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.
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.
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.
27 /*----- Header files ------------------------------------------------------*/
29 #include "catacomb-python.h"
31 /*----- Data structures ---------------------------------------------------*/
33 typedef struct buf_pyobj {
39 static PyTypeObject *rbuf_pytype, *wbuf_pytype;
40 #define RBUF_PYCHECK(o) PyObject_TypeCheck((o), rbuf_pytype)
41 #define WBUF_PYCHECK(o) PyObject_TypeCheck((o), wbuf_pytype)
42 #define BUF_B(o) (&((buf_pyobj *)(o))->b)
43 #define BUF_SUB(o) (((buf_pyobj *)(o))->sub)
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))
64 me = (buf_pyobj *)ty->tp_alloc(ty, 0);
66 buf_init(&me->b, q, n);
68 return ((PyObject *)me);
71 static void buf_pydealloc(PyObject *me)
74 Py_DECREF(BUF_SUB(me));
76 xfree(BBASE(BUF_B(me)));
80 static Py_ssize_t rbuf_pysegcount(PyObject *me, Py_ssize_t *nn)
81 { if (nn) *nn = BSZ(BUF_B(me)); return (1); }
83 static Py_ssize_t rbuf_pyreadbuf(PyObject *me, Py_ssize_t seg, void **q)
84 { assert(seg == 0); *q = BCUR(BUF_B(me)); return (BLEFT(BUF_B(me))); }
86 static PyObject *rbmeth_skip(PyObject *me, PyObject *arg)
90 if (!PyArg_ParseTuple(arg, "O&:skip", convszt, &n)) goto end;
91 if (!buf_get(BUF_B(me), n)) BUFERR();
97 static PyObject *rbmeth_get(PyObject *me, PyObject *arg)
102 if (!PyArg_ParseTuple(arg, "O&:get", convszt, &n)) goto end;
103 if ((p = buf_get(BUF_B(me), n)) == 0) BUFERR();
104 return (bytestring_pywrap(p, n));
109 #define RBMETH_GETU_(n, W, w) \
110 static PyObject *rbmeth_getu##w(PyObject *me, PyObject *arg) \
113 if (!PyArg_ParseTuple(arg, ":getu" #w)) goto end; \
114 if (buf_getu##w(BUF_B(me), &x)) BUFERR(); \
115 return (getulong(x)); \
119 DOUINTCONV(RBMETH_GETU_)
121 #define RBMETH_GETBLK_(n, W, w) \
122 static PyObject *rbmeth_getblk##w(PyObject *me, PyObject *arg) \
126 if (!PyArg_ParseTuple(arg, ":getblk" #w)) goto end; \
127 if ((q = buf_getmem##w(BUF_B(me), &sz)) == 0) BUFERR(); \
128 return (bytestring_pywrap(q, sz)); \
132 BUF_DOSUFFIXES(RBMETH_GETBLK_)
134 #define RBMETH_GETBUF_(n, W, w) \
135 static PyObject *rbmeth_getbuf##w(PyObject *me, PyObject *arg) \
139 if (!PyArg_ParseTuple(arg, ":getbuf" #w)) goto end; \
140 if (buf_getbuf##w(BUF_B(me), &bb)) BUFERR(); \
141 b = PyObject_NEW(buf_pyobj, rbuf_pytype); \
145 return ((PyObject *)b); \
149 BUF_DOSUFFIXES(RBMETH_GETBUF_)
151 static PyObject *rbmeth_getmp(PyObject *me, PyObject *arg)
154 if (!PyArg_ParseTuple(arg, ":getmp")) goto end;
155 if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR();
156 return (mp_pywrap(x));
161 static PyObject *rbmeth_getgf(PyObject *me, PyObject *arg)
164 if (!PyArg_ParseTuple(arg, ":getgf")) goto end;
165 if ((x = buf_getmp(BUF_B(me))) == 0) BUFERR();
166 return (gf_pywrap(x));
171 static PyObject *rbmeth_getecpt(PyObject *me, PyObject *arg, PyObject *kw)
173 PyObject *cobj = Py_None;
174 static char *kwlist[] = { "curve", 0 };
176 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O:getecpt", kwlist, &cobj))
178 if (cobj == Py_None) cobj = (PyObject *)ecpt_pytype;
179 if (!PyType_Check(cobj) ||
180 !PyType_IsSubtype((PyTypeObject *)cobj, ecpt_pytype))
181 TYERR("expected elliptic curve type");
182 if (buf_getec(BUF_B(me), &pt)) BUFERR();
183 return (ecpt_pywrapout(cobj, &pt));
188 static PyObject *rbmeth_getecptraw(PyObject *me, PyObject *arg)
190 PyTypeObject *cobj = ecpt_pytype;
192 if (!PyArg_ParseTuple(arg, "O!:getecptraw", eccurve_pytype, &cobj))
194 if (ec_getraw(ECCURVE_C(cobj), BUF_B(me), &pt)) BUFERR();
195 return (ecpt_pywrapout(cobj, &pt));
200 static PyObject *rbmeth_getge(PyObject *me, PyObject *arg)
204 if (!PyArg_ParseTuple(arg, "O!:getge", group_pytype, &gobj)) goto end;
205 x = G_CREATE(GROUP_G(gobj));
206 if (G_FROMBUF(GROUP_G(gobj), BUF_B(me), x)) BUFERR();
207 return (ge_pywrap(gobj, x));
209 if (x) G_DESTROY(GROUP_G(gobj), x);
213 static PyObject *rbmeth_getgeraw(PyObject *me, PyObject *arg)
217 if (!PyArg_ParseTuple(arg, "O!:getgeraw", group_pytype, &gobj)) goto end;
218 x = G_CREATE(GROUP_G(gobj));
219 if (G_FROMRAW(GROUP_G(gobj), BUF_B(me), x)) BUFERR();
220 return (ge_pywrap(gobj, x));
222 if (x) G_DESTROY(GROUP_G(gobj), x);
226 static PyObject *rbget_size(PyObject *me, void *hunoz)
227 { return (PyInt_FromLong(BSZ(BUF_B(me)))); }
228 static PyObject *rbget_left(PyObject *me, void *hunoz)
229 { return (PyInt_FromLong(BLEFT(BUF_B(me)))); }
230 static PyObject *rbget_endp(PyObject *me, void *hunoz)
231 { return (getbool(!BLEFT(BUF_B(me)))); }
232 static PyObject *rbget_offset(PyObject *me, void *hunoz)
233 { return (PyInt_FromLong(BLEN(BUF_B(me)))); }
234 static int rbset_offset(PyObject *me, PyObject *x, void *hunoz)
237 if (!x) NIERR("__del__");
238 if (!convszt(x, &n)) goto end;
239 if (n > BSZ(BUF_B(me))) VALERR("out of range");
240 BCUR(BUF_B(me)) = BBASE(BUF_B(me)) + n;
246 static PyGetSetDef rbuf_pygetset[] = {
247 #define GETSETNAME(op, name) rb##op##_##name
248 GET (size, "RBUF.size -> SIZE")
249 GET (left, "RBUF.left -> REMAINDER")
250 GET (endp, "RBUF.endp -> BOOL")
251 GETSET(offset, "RBUF.offset -> OFFSET")
256 static PyMethodDef rbuf_pymethods[] = {
257 #define METHNAME(func) rbmeth_##func
258 METH (skip, "RBUF.skip(N)")
259 METH (get, "RBUF.get(N) -> BYTES")
260 #define RBMETH_DECL_GETU_(n, W, w) \
261 METH(getu##w, "RBUF.getu" #w "() -> INT")
262 DOUINTCONV(RBMETH_DECL_GETU_)
263 #define RBMETH_DECL_GETBLK_(n, W, w) \
264 METH(getblk##w, "RBUF.getblk" #w "() -> INT")
265 BUF_DOSUFFIXES(RBMETH_DECL_GETBLK_)
266 #define RBMETH_DECL_GETBUF_(n, W, w) \
267 METH(getbuf##w, "RBUF.getbuf" #w "() -> INT")
268 BUF_DOSUFFIXES(RBMETH_DECL_GETBUF_)
269 METH (getmp, "RBUF.getmp() -> X")
270 METH (getgf, "RBUF.getgf() -> X")
271 KWMETH(getecpt, "RBUF.getecpt(curve = None) -> P")
272 METH (getecptraw, "RBUF.getecptraw(CURVE) -> P")
273 METH (getge, "RBUF.getge(GROUP) -> X")
274 METH (getgeraw, "RBUF.getgeraw(GROUP) -> X")
279 static PyBufferProcs rbuf_pybuffer = {
280 rbuf_pyreadbuf, /* @bf_getreadbuffer@ */
281 0, /* @bf_getwritebuffer@ */
282 rbuf_pysegcount, /* @bf_getsegcount@ */
283 0 /* @bf_getcharbuffer@ */
286 static PyTypeObject rbuf_pytype_skel = {
287 PyObject_HEAD_INIT(0) 0, /* Header */
288 "ReadBuffer", /* @tp_name@ */
289 sizeof(buf_pyobj), /* @tp_basicsize@ */
290 0, /* @tp_itemsize@ */
292 buf_pydealloc, /* @tp_dealloc@ */
294 0, /* @tp_getattr@ */
295 0, /* @tp_setattr@ */
296 0, /* @tp_compare@ */
298 0, /* @tp_as_number@ */
299 0, /* @tp_as_sequence@ */
300 0, /* @tp_as_mapping@ */
304 0, /* @tp_getattro@ */
305 0, /* @tp_setattro@ */
306 &rbuf_pybuffer, /* @tp_as_buffer@ */
307 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
313 0, /* @tp_traverse@ */
315 0, /* @tp_richcompare@ */
316 0, /* @tp_weaklistoffset@ */
318 0, /* @tp_iternext@ */
319 rbuf_pymethods, /* @tp_methods@ */
320 0, /* @tp_members@ */
321 rbuf_pygetset, /* @tp_getset@ */
324 0, /* @tp_descr_get@ */
325 0, /* @tp_descr_set@ */
326 0, /* @tp_dictoffset@ */
328 PyType_GenericAlloc, /* @tp_alloc@ */
329 rbuf_pynew, /* @tp_new@ */
334 /*----- Write buffers -----------------------------------------------------*/
336 static void ensure(PyObject *me, size_t n)
343 size_t want = BLEN(b) + n;
344 while (nn < want) nn <<= 1;
345 p = xrealloc(BBASE(b), nn, BSZ(b));
346 BCUR(b) = p + BLEN(b);
352 static PyObject *wbuf_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
357 static char *kwlist[] = { "size", 0 };
359 if (!PyArg_ParseTupleAndKeywords(arg, kw, "|O&:new", kwlist,
362 me = (buf_pyobj *)ty->tp_alloc(ty, 0);
365 buf_init(&me->b, p, n);
367 return ((PyObject *)me);
370 static Py_ssize_t wbuf_pysegcount(PyObject *me, Py_ssize_t *nn)
371 { if (nn) *nn = BLEN(BUF_B(me)); return (1); }
373 static Py_ssize_t wbuf_pyreadbuf(PyObject *me, Py_ssize_t seg, void **q)
374 { assert(seg == 0); *q = BBASE(BUF_B(me)); return (BLEN(BUF_B(me))); }
376 static PyObject *wbmeth_zero(PyObject *me, PyObject *arg)
380 if (!PyArg_ParseTuple(arg, "O&:zero", convszt, &n)) return (0);
382 p = buf_get(BUF_B(me), n); assert(p && BOK(BUF_B(me)));
387 static PyObject *wbmeth_put(PyObject *me, PyObject *arg)
391 if (!PyArg_ParseTuple(arg, "s#:put", &p, &n)) return (0);
393 buf_put(BUF_B(me), p, n); assert(BOK(BUF_B(m)));
397 #define WBMETH_PUTU_(n, W, w) \
398 static PyObject *wbmeth_putu##w(PyObject *me, PyObject *arg) \
401 if (!PyArg_ParseTuple(arg, "O&:putu" #w, convu##n, &i)) return (0); \
402 ensure(me, SZ_##n); \
403 buf_putu##w(BUF_B(me), i); assert(BOK(BUF_B(me))); \
406 DOUINTCONV(WBMETH_PUTU_)
409 #define WBMETH_PUTBLK_(n, W, w) \
410 static PyObject *wbmeth_putblk##w(PyObject *me, PyObject *arg) \
414 if (!PyArg_ParseTuple(arg, "s#:putblk" #w, &p, &sz)) return (0); \
415 ensure(me, sz + SZ_##n); \
416 buf_putmem##w(BUF_B(me), p, sz); assert(BOK(BUF_B(me))); \
419 BUF_DOSUFFIXES(WBMETH_PUTBLK_)
421 static PyObject *wbmeth_putmp(PyObject *me, PyObject *arg)
424 if (!PyArg_ParseTuple(arg, "O&:putmp", convmp, &x)) return (0);
425 ensure(me, mp_octets(x) + 2);
426 buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
430 static PyObject *wbmeth_putgf(PyObject *me, PyObject *arg)
433 if (!PyArg_ParseTuple(arg, "O&:putgf", convgf, &x)) return (0);
434 ensure(me, mp_octets(x) + 2);
435 buf_putmp(BUF_B(me), x); assert(BOK(BUF_B(me)));
440 static PyObject *wbmeth_putecpt(PyObject *me, PyObject *arg)
443 if (!PyArg_ParseTuple(arg, "O&:putecpt", convecpt, &pt)) return (0);
444 if (EC_ATINF(&pt)) ensure(me, 2);
445 else ensure(me, 4 + mp_octets(pt.x) + mp_octets(pt.y));
446 buf_putec(BUF_B(me), &pt); assert(BOK(BUF_B(me)));
451 static PyObject *wbmeth_putecptraw(PyObject *me, PyObject *arg)
455 if (!PyArg_ParseTuple(arg, "O!:putecptraw", ecptcurve_pytype, &ptobj))
457 EC_OUT(ECPT_C(ptobj), &pt, ECPT_P(ptobj));
458 ensure(me, ECPT_C(ptobj)->f->noctets * 2 + 1);
459 ec_putraw(ECPT_C(ptobj), BUF_B(me), &pt); assert(BOK(BUF_B(me)));
464 static PyObject *wbmeth_putge(PyObject *me, PyObject *arg)
467 if (!PyArg_ParseTuple(arg, "O!:putge", ge_pytype, &geobj)) return (0);
468 ensure(me, GE_G(geobj)->noctets);
469 G_TOBUF(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
473 static PyObject *wbmeth_putgeraw(PyObject *me, PyObject *arg)
476 if (!PyArg_ParseTuple(arg, "O!:putgeraw", ge_pytype, &geobj)) return (0);
477 ensure(me, GE_G(geobj)->noctets);
478 G_TORAW(GE_G(geobj), BUF_B(me), GE_X(geobj)); assert(BOK(BUF_B(me)));
482 static PyObject *wbget_size(PyObject *me, void *hunoz)
483 { return (PyInt_FromLong(BLEN(BUF_B(me)))); }
485 static PyGetSetDef wbuf_pygetset[] = {
486 #define GETSETNAME(op, name) wb##op##_##name
487 GET (size, "WBUF.size -> SIZE")
492 static PyMethodDef wbuf_pymethods[] = {
493 #define METHNAME(func) wbmeth_##func
494 METH (zero, "WBUF.zero(N)")
495 METH (put, "WBUF.put(BYTES)")
496 #define WBMETH_DECL_PUTU_(n, W, w) \
497 METH(putu##w, "WBUF.putu" #w "(INT)")
498 DOUINTCONV(WBMETH_DECL_PUTU_)
499 #define WBMETH_DECL_PUTBLK_(n, W, w) \
500 METH(putblk##w, "WBUF.putblk" #w "(BYTES)")
501 BUF_DOSUFFIXES(WBMETH_DECL_PUTBLK_)
502 METH (putmp, "WBUF.putmp(X)")
503 METH (putgf, "WBUF.putgf(X)")
504 KWMETH(putecpt, "WBUF.putecpt(P)")
505 METH (putecptraw, "WBUF.putecptraw(P)")
506 METH (putge, "WBUF.putge(X)")
507 METH (putgeraw, "WBUF.putgeraw(X)")
512 static PyBufferProcs wbuf_pybuffer = {
513 wbuf_pyreadbuf, /* @bf_getreadbuffer@ */
514 0, /* @bf_getwritebuffer@ */
515 wbuf_pysegcount, /* @bf_getsegcount@ */
516 0 /* @bf_getcharbuffer@ */
519 static PyTypeObject wbuf_pytype_skel = {
520 PyObject_HEAD_INIT(0) 0, /* Header */
521 "WriteBuffer", /* @tp_name@ */
522 sizeof(buf_pyobj), /* @tp_basicsize@ */
523 0, /* @tp_itemsize@ */
525 buf_pydealloc, /* @tp_dealloc@ */
527 0, /* @tp_getattr@ */
528 0, /* @tp_setattr@ */
529 0, /* @tp_compare@ */
531 0, /* @tp_as_number@ */
532 0, /* @tp_as_sequence@ */
533 0, /* @tp_as_mapping@ */
537 0, /* @tp_getattro@ */
538 0, /* @tp_setattro@ */
539 &wbuf_pybuffer, /* @tp_as_buffer@ */
540 Py_TPFLAGS_DEFAULT | /* @tp_flags@ */
546 0, /* @tp_traverse@ */
548 0, /* @tp_richcompare@ */
549 0, /* @tp_weaklistoffset@ */
551 0, /* @tp_iternext@ */
552 wbuf_pymethods, /* @tp_methods@ */
553 0, /* @tp_members@ */
554 wbuf_pygetset, /* @tp_getset@ */
557 0, /* @tp_descr_get@ */
558 0, /* @tp_descr_set@ */
559 0, /* @tp_dictoffset@ */
561 PyType_GenericAlloc, /* @tp_alloc@ */
562 wbuf_pynew, /* @tp_new@ */
567 /*----- Initialization ----------------------------------------------------*/
569 void buffer_pyinit(void)
571 INITTYPE(rbuf, root);
572 INITTYPE(wbuf, root);
575 void buffer_pyinsert(PyObject *mod)
577 INSEXC("BufferError", buferr, PyExc_Exception, 0);
578 INSERT("ReadBuffer", rbuf_pytype);
579 INSERT("WriteBuffer", wbuf_pytype);
582 /*----- That's all, folks -------------------------------------------------*/