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 /*----- Read buffers ------------------------------------------------------*/
33 PyTypeObject
*rbuf_pytype
;
35 static PyObject
*rbuf_pynew(PyTypeObject
*ty
, PyObject
*arg
, PyObject
*kw
)
40 static const char *const kwlist
[] = { "data", 0 };
42 if (!PyArg_ParseTupleAndKeywords(arg
, kw
, "O&:new", KWLIST
, convbin
, &in
))
45 memcpy(q
, in
.p
, in
.sz
);
46 me
= (buf_pyobj
*)ty
->tp_alloc(ty
, 0);
47 me
->sub
= 0; me
->lk
= 0;
48 buf_init(&me
->b
, q
, in
.sz
);
50 return ((PyObject
*)me
);
53 static void buf_pydealloc(PyObject
*me
)
56 if (BUF_SUB(me
)) Py_DECREF(BUF_SUB(me
));
57 else xfree(BBASE(BUF_B(me
)));
62 static int rbuf_pygetbuf(PyObject
*me
, Py_buffer
*vw
, int f
)
65 return (PyBuffer_FillInfo(vw
, me
, BCUR(b
), BLEFT(b
), 1, f
));
68 static Py_ssize_t
rbuf_pysegcount(PyObject
*me
, Py_ssize_t
*nn
)
69 { if (nn
) *nn
= BSZ(BUF_B(me
)); return (1); }
70 static Py_ssize_t
rbuf_pyreadbuf(PyObject
*me
, Py_ssize_t seg
, void **q
)
71 { assert(seg
== 0); *q
= BCUR(BUF_B(me
)); return (BLEFT(BUF_B(me
))); }
74 static PyObject
*rbmeth_skip(PyObject
*me
, PyObject
*arg
)
78 if (!PyArg_ParseTuple(arg
, "O&:skip", convszt
, &n
)) goto end
;
79 if (!buf_get(BUF_B(me
), n
)) BUFERR("buffer exhausted");
85 static PyObject
*rbmeth_get(PyObject
*me
, PyObject
*arg
)
90 if (!PyArg_ParseTuple(arg
, "O&:get", convszt
, &n
)) goto end
;
91 if ((p
= buf_get(BUF_B(me
), n
)) == 0) BUFERR("buffer exhausted");
92 return (bytestring_pywrap(p
, n
));
97 #define RBMETH_GETU_(n, W, w) \
98 static PyObject *rbmeth_getu##w(PyObject *me) \
101 if (buf_getu##w(BUF_B(me), &x)) BUFERR("buffer exhausted"); \
102 if (MASK##W <= ULONG_MAX) return (getulong(x)); \
103 else { kludge64 y; ASSIGN64(y, x); return (getk64(y)); } \
107 DOUINTCONV(RBMETH_GETU_
)
109 #define RBMETH_GETBLK_(n, W, w) \
110 static PyObject *rbmeth_getblk##w(PyObject *me) \
114 if ((q = buf_getmem##w(BUF_B(me), &sz)) == 0) \
115 BUFERR("buffer exhausted"); \
116 return (bytestring_pywrap(q, sz)); \
120 BUF_DOSUFFIXES(RBMETH_GETBLK_
)
122 #define RBMETH_GETBUF_(n, W, w) \
123 static PyObject *rbmeth_getbuf##w(PyObject *me) \
127 if (buf_getbuf##w(BUF_B(me), &bb)) BUFERR("buffer exhausted"); \
128 b = PyObject_NEW(buf_pyobj, rbuf_pytype); \
133 return ((PyObject *)b); \
137 BUF_DOSUFFIXES(RBMETH_GETBUF_
)
139 static PyObject
*rbmeth_getmp(PyObject
*me
)
142 if ((x
= buf_getmp(BUF_B(me
))) == 0) BUFERR("buffer exhausted");
143 return (mp_pywrap(x
));
148 static PyObject
*rbmeth_getgf(PyObject
*me
)
151 if ((x
= buf_getmp(BUF_B(me
))) == 0) BUFERR("buffer exhausted");
152 return (gf_pywrap(x
));
157 static PyObject
*rbmeth_getecpt(PyObject
*me
, PyObject
*arg
, PyObject
*kw
)
159 PyObject
*cobj
= Py_None
;
160 static const char *const kwlist
[] = { "curve", 0 };
162 if (!PyArg_ParseTupleAndKeywords(arg
, kw
, "|O:getecpt", KWLIST
, &cobj
))
164 if (cobj
== Py_None
) cobj
= (PyObject
*)ecpt_pytype
;
165 if (!PyType_Check(cobj
) ||
166 !PyType_IsSubtype((PyTypeObject
*)cobj
, ecpt_pytype
))
167 TYERR("expected elliptic curve type");
168 if (buf_getec(BUF_B(me
), &pt
)) BUFERR("buffer exhausted");
169 return (ecpt_pywrapout(cobj
, &pt
));
174 static PyObject
*rbmeth_getecptraw(PyObject
*me
, PyObject
*arg
)
179 if (!PyArg_ParseTuple(arg
, "O!:getecptraw", eccurve_pytype
, &cobj
))
181 if (ec_getraw(ECCURVE_C(cobj
), BUF_B(me
), &pt
)) BUFERR("buffer exhausted");
182 rc
= ecpt_pywrapout(cobj
, &pt
);
187 static PyObject
*rbmeth_getge(PyObject
*me
, PyObject
*arg
)
191 if (!PyArg_ParseTuple(arg
, "O!:getge", group_pytype
, &gobj
)) goto end
;
192 x
= G_CREATE(GROUP_G(gobj
));
193 if (G_FROMBUF(GROUP_G(gobj
), BUF_B(me
), x
)) BUFERR("buffer exhausted");
194 return (ge_pywrap(gobj
, x
));
196 if (x
) G_DESTROY(GROUP_G(gobj
), x
);
200 static PyObject
*rbmeth_getgeraw(PyObject
*me
, PyObject
*arg
)
204 if (!PyArg_ParseTuple(arg
, "O!:getgeraw", group_pytype
, &gobj
)) goto end
;
205 x
= G_CREATE(GROUP_G(gobj
));
206 if (G_FROMRAW(GROUP_G(gobj
), BUF_B(me
), x
)) BUFERR("buffer exhausted");
207 return (ge_pywrap(gobj
, x
));
209 if (x
) G_DESTROY(GROUP_G(gobj
), x
);
213 static PyObject
*rbget_size(PyObject
*me
, void *hunoz
)
214 { return (PyInt_FromLong(BSZ(BUF_B(me
)))); }
215 static PyObject
*rbget_left(PyObject
*me
, void *hunoz
)
216 { return (PyInt_FromLong(BLEFT(BUF_B(me
)))); }
217 static PyObject
*rbget_endp(PyObject
*me
, void *hunoz
)
218 { return (getbool(!BLEFT(BUF_B(me
)))); }
219 static PyObject
*rbget_offset(PyObject
*me
, void *hunoz
)
220 { return (PyInt_FromLong(BLEN(BUF_B(me
)))); }
221 static int rbset_offset(PyObject
*me
, PyObject
*x
, void *hunoz
)
224 if (!x
) NIERR("__del__");
225 if (!convszt(x
, &n
)) goto end
;
226 if (n
> BSZ(BUF_B(me
))) VALERR("out of range");
227 BCUR(BUF_B(me
)) = BBASE(BUF_B(me
)) + n
;
233 static const PyGetSetDef rbuf_pygetset
[] = {
234 #define GETSETNAME(op, name) rb##op##_##name
235 GET (size
, "RBUF.size -> SIZE")
236 GET (left
, "RBUF.left -> REMAINDER")
237 GET (endp
, "RBUF.endp -> BOOL")
238 GETSET(offset
, "RBUF.offset -> OFFSET")
243 static const PyMethodDef rbuf_pymethods
[] = {
244 #define METHNAME(func) rbmeth_##func
245 METH (skip
, "RBUF.skip(N)")
246 METH (get
, "RBUF.get(N) -> BYTES")
247 #define RBMETH_DECL_GETU_(n, W, w) \
248 NAMETH(getu##w, "RBUF.getu" #w "() -> INT")
249 DOUINTCONV(RBMETH_DECL_GETU_
)
250 #define RBMETH_DECL_GETBLK_(n, W, w) \
251 NAMETH(getblk##w, "RBUF.getblk" #w "() -> BYTES")
252 BUF_DOSUFFIXES(RBMETH_DECL_GETBLK_
)
253 #define RBMETH_DECL_GETBUF_(n, W, w) \
254 NAMETH(getbuf##w, "RBUF.getbuf" #w "() -> RBUF'")
255 BUF_DOSUFFIXES(RBMETH_DECL_GETBUF_
)
256 NAMETH(getmp
, "RBUF.getmp() -> X")
257 NAMETH(getgf
, "RBUF.getgf() -> X")
258 KWMETH(getecpt
, "RBUF.getecpt([curve = None]) -> P")
259 METH (getecptraw
, "RBUF.getecptraw(CURVE) -> P")
260 METH (getge
, "RBUF.getge(GROUP) -> X")
261 METH (getgeraw
, "RBUF.getgeraw(GROUP) -> X")
266 static const PyBufferProcs rbuf_pybuffer
= {
268 rbuf_pygetbuf
, /* @bf_getbuffer@ */
269 0, /* @bf_releasebuffer@ */
271 rbuf_pyreadbuf
, /* @bf_getreadbuffer@ */
272 0, /* @bf_getwritebuffer@ */
273 rbuf_pysegcount
, /* @bf_getsegcount@ */
274 0 /* @bf_getcharbuffer@ */
278 static const PyTypeObject rbuf_pytype_skel
= {
279 PyVarObject_HEAD_INIT(0, 0) /* Header */
280 "ReadBuffer", /* @tp_name@ */
281 sizeof(buf_pyobj
), /* @tp_basicsize@ */
282 0, /* @tp_itemsize@ */
284 buf_pydealloc
, /* @tp_dealloc@ */
286 0, /* @tp_getattr@ */
287 0, /* @tp_setattr@ */
288 0, /* @tp_compare@ */
290 0, /* @tp_as_number@ */
291 0, /* @tp_as_sequence@ */
292 0, /* @tp_as_mapping@ */
296 0, /* @tp_getattro@ */
297 0, /* @tp_setattro@ */
298 PYBUFFER(rbuf
), /* @tp_as_buffer@ */
299 Py_TPFLAGS_DEFAULT
| /* @tp_flags@ */
303 "ReadBuffer(STR): a read buffer.",
305 0, /* @tp_traverse@ */
307 0, /* @tp_richcompare@ */
308 0, /* @tp_weaklistoffset@ */
310 0, /* @tp_iternext@ */
311 PYMETHODS(rbuf
), /* @tp_methods@ */
312 0, /* @tp_members@ */
313 PYGETSET(rbuf
), /* @tp_getset@ */
316 0, /* @tp_descr_get@ */
317 0, /* @tp_descr_set@ */
318 0, /* @tp_dictoffset@ */
320 PyType_GenericAlloc
, /* @tp_alloc@ */
321 rbuf_pynew
, /* @tp_new@ */
326 /*----- Write buffers -----------------------------------------------------*/
328 PyTypeObject
*wbuf_pytype
;
330 int ensurebuf(PyObject
*me
, size_t n
)
335 size_t want
= BLEN(b
) + n
;
340 BUFERR("buffer locked");
342 while (nn
< want
) nn
<<= 1;
343 p
= xrealloc(BBASE(b
), nn
, BSZ(b
));
344 BCUR(b
) = p
+ BLEN(b
);
353 static PyObject
*wbuf_pynew(PyTypeObject
*ty
, PyObject
*arg
, PyObject
*kw
)
358 static const char *const kwlist
[] = { "size", 0 };
360 if (!PyArg_ParseTupleAndKeywords(arg
, kw
, "|O&:new", KWLIST
,
363 me
= (buf_pyobj
*)ty
->tp_alloc(ty
, 0);
365 me
->sub
= 0; me
->lk
= 0;
366 buf_init(&me
->b
, p
, n
);
368 return ((PyObject
*)me
);
372 static int wbuf_pygetbuf(PyObject
*me
, Py_buffer
*vw
, int f
)
375 if (PyBuffer_FillInfo(vw
, me
, BBASE(b
), BLEN(b
), 0, f
)) return (-1);
376 BUF_LK(me
)++; return (0);
378 static void wbuf_pyrlsbuf(PyObject
*me
, Py_buffer
*vw
)
381 static Py_ssize_t
wbuf_pysegcount(PyObject
*me
, Py_ssize_t
*nn
)
382 { if (nn
) *nn
= BLEN(BUF_B(me
)); return (1); }
383 static Py_ssize_t
wbuf_pyreadbuf(PyObject
*me
, Py_ssize_t seg
, void **q
)
384 { assert(seg
== 0); *q
= BBASE(BUF_B(me
)); return (BLEN(BUF_B(me
))); }
387 static PyObject
*wbmeth_zero(PyObject
*me
, PyObject
*arg
)
391 if (!PyArg_ParseTuple(arg
, "O&:zero", convszt
, &n
)) return (0);
392 if (ensurebuf(me
, n
)) return (0);
393 p
= buf_get(BUF_B(me
), n
); assert(p
&& BOK(BUF_B(me
)));
398 static PyObject
*wbmeth_put(PyObject
*me
, PyObject
*arg
)
401 if (!PyArg_ParseTuple(arg
, "O&:put", convbin
, &in
)) return (0);
402 if (ensurebuf(me
, in
.sz
)) return (0);
403 buf_put(BUF_B(me
), in
.p
, in
.sz
); assert(BOK(BUF_B(me
)));
407 #define WBMETH_PUTU_(n, W, w) \
408 static PyObject *wbmeth_putu##w(PyObject *me, PyObject *arg) \
411 if (!PyArg_ParseTuple(arg, "O&:putu" #w, convu##n, &i)) return (0); \
412 if (ensurebuf(me, SZ_##n)) return (0); \
413 buf_putu##w(BUF_B(me), i); assert(BOK(BUF_B(me))); \
416 DOUINTCONV(WBMETH_PUTU_
)
420 #define WBMETH_PUTBLK_(n, W, w) \
421 static PyObject *wbmeth_putblk##w(PyObject *me, PyObject *arg) \
424 if (!PyArg_ParseTuple(arg, "O&:putblk" #w, convbin, &in)) goto end; \
425 if (MASK##W && in.sz > MASK##W) VALERR("too large"); \
426 if (ensurebuf(me, in.sz + SZ_##n)) return (0); \
427 buf_putmem##w(BUF_B(me), in.p, in.sz); assert(BOK(BUF_B(me))); \
432 BUF_DOSUFFIXES(WBMETH_PUTBLK_
)
434 static PyObject
*wbmeth_putmp(PyObject
*me
, PyObject
*arg
)
437 if (!PyArg_ParseTuple(arg
, "O&:putmp", convmp
, &x
)) return (0);
438 if (ensurebuf(me
, mp_octets(x
) + 2)) return (0);
439 buf_putmp(BUF_B(me
), x
); assert(BOK(BUF_B(me
)));
443 static PyObject
*wbmeth_putgf(PyObject
*me
, PyObject
*arg
)
446 if (!PyArg_ParseTuple(arg
, "O&:putgf", convgf
, &x
)) return (0);
447 if (ensurebuf(me
, mp_octets(x
) + 2)) return (0);
448 buf_putmp(BUF_B(me
), x
); assert(BOK(BUF_B(me
)));
453 static PyObject
*wbmeth_putecpt(PyObject
*me
, PyObject
*arg
)
456 if (!PyArg_ParseTuple(arg
, "O&:putecpt", convecpt
, &pt
)) return (0);
457 if (ensurebuf(me
, EC_ATINF(&pt
) ?
2 :
458 6 + mp_octets(pt
.x
) + mp_octets(pt
.y
)))
460 buf_putec(BUF_B(me
), &pt
); assert(BOK(BUF_B(me
)));
465 static PyObject
*wbmeth_putecptraw(PyObject
*me
, PyObject
*arg
)
469 if (!PyArg_ParseTuple(arg
, "O!:putecptraw", ecptcurve_pytype
, &ptobj
))
471 EC_OUT(ECPT_C(ptobj
), &pt
, ECPT_P(ptobj
));
472 if (ensurebuf(me
, ECPT_C(ptobj
)->f
->noctets
* 2 + 1)) return (0);
473 ec_putraw(ECPT_C(ptobj
), BUF_B(me
), &pt
); assert(BOK(BUF_B(me
)));
478 static PyObject
*wbmeth_putge(PyObject
*me
, PyObject
*arg
)
481 if (!PyArg_ParseTuple(arg
, "O!:putge", ge_pytype
, &geobj
)) return (0);
482 if (ensurebuf(me
, GE_G(geobj
)->noctets
)) return (0);
483 G_TOBUF(GE_G(geobj
), BUF_B(me
), GE_X(geobj
)); assert(BOK(BUF_B(me
)));
487 static PyObject
*wbmeth_putgeraw(PyObject
*me
, PyObject
*arg
)
490 if (!PyArg_ParseTuple(arg
, "O!:putgeraw", ge_pytype
, &geobj
)) return (0);
491 if (ensurebuf(me
, GE_G(geobj
)->noctets
)) return (0);
492 G_TORAW(GE_G(geobj
), BUF_B(me
), GE_X(geobj
)); assert(BOK(BUF_B(me
)));
496 static PyObject
*wbget_size(PyObject
*me
, void *hunoz
)
497 { return (PyInt_FromLong(BLEN(BUF_B(me
)))); }
499 static PyObject
*wbget_contents(PyObject
*me
, void *hunoz
)
500 { return (bytestring_pywrap(BBASE(BUF_B(me
)), BLEN(BUF_B(me
)))); }
502 static const PyGetSetDef wbuf_pygetset
[] = {
503 #define GETSETNAME(op, name) wb##op##_##name
504 GET (size
, "WBUF.size -> SIZE")
505 GET (contents
, "WBUF.contents -> STR")
510 static const PyMethodDef wbuf_pymethods
[] = {
511 #define METHNAME(func) wbmeth_##func
512 METH (zero
, "WBUF.zero(N)")
513 METH (put
, "WBUF.put(BYTES)")
514 #define WBMETH_DECL_PUTU_(n, W, w) \
515 METH(putu##w, "WBUF.putu" #w "(INT)")
516 DOUINTCONV(WBMETH_DECL_PUTU_
)
517 #define WBMETH_DECL_PUTBLK_(n, W, w) \
518 METH(putblk##w, "WBUF.putblk" #w "(BYTES)")
519 BUF_DOSUFFIXES(WBMETH_DECL_PUTBLK_
)
520 METH (putmp
, "WBUF.putmp(X)")
521 METH (putgf
, "WBUF.putgf(X)")
522 METH (putecpt
, "WBUF.putecpt(P)")
523 METH (putecptraw
, "WBUF.putecptraw(P)")
524 METH (putge
, "WBUF.putge(X)")
525 METH (putgeraw
, "WBUF.putgeraw(X)")
530 static const PyBufferProcs wbuf_pybuffer
= {
532 wbuf_pygetbuf
, /* @bf_getbuffer@ */
533 wbuf_pyrlsbuf
/* @bf_releasebuffer@ */
535 wbuf_pyreadbuf
, /* @bf_getreadbuffer@ */
536 0, /* @bf_getwritebuffer@ */
537 wbuf_pysegcount
, /* @bf_getsegcount@ */
538 0 /* @bf_getcharbuffer@ */
542 static const PyTypeObject wbuf_pytype_skel
= {
543 PyVarObject_HEAD_INIT(0, 0) /* Header */
544 "WriteBuffer", /* @tp_name@ */
545 sizeof(buf_pyobj
), /* @tp_basicsize@ */
546 0, /* @tp_itemsize@ */
548 buf_pydealloc
, /* @tp_dealloc@ */
550 0, /* @tp_getattr@ */
551 0, /* @tp_setattr@ */
552 0, /* @tp_compare@ */
554 0, /* @tp_as_number@ */
555 0, /* @tp_as_sequence@ */
556 0, /* @tp_as_mapping@ */
560 0, /* @tp_getattro@ */
561 0, /* @tp_setattro@ */
562 PYBUFFER(wbuf
), /* @tp_as_buffer@ */
563 Py_TPFLAGS_DEFAULT
| /* @tp_flags@ */
567 "WriteBuffer([size = ?]): a write buffer.",
569 0, /* @tp_traverse@ */
571 0, /* @tp_richcompare@ */
572 0, /* @tp_weaklistoffset@ */
574 0, /* @tp_iternext@ */
575 PYMETHODS(wbuf
), /* @tp_methods@ */
576 0, /* @tp_members@ */
577 PYGETSET(wbuf
), /* @tp_getset@ */
580 0, /* @tp_descr_get@ */
581 0, /* @tp_descr_set@ */
582 0, /* @tp_dictoffset@ */
584 PyType_GenericAlloc
, /* @tp_alloc@ */
585 wbuf_pynew
, /* @tp_new@ */
590 /*----- Initialization ----------------------------------------------------*/
594 void buffer_pyinit(void)
596 INITTYPE(rbuf
, root
);
597 INITTYPE(wbuf
, root
);
600 void buffer_pyinsert(PyObject
*mod
)
602 INSEXC("BufferError", buferr
, PyExc_Exception
, 0);
603 INSERT("ReadBuffer", rbuf_pytype
);
604 INSERT("WriteBuffer", wbuf_pytype
);
607 /*----- That's all, folks -------------------------------------------------*/