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1 | /* | |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "config.h" | |
22 | #include <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */ | |
23 | #include <stdio.h> | |
24 | #include <string.h> | |
25 | #include <dirent.h> | |
26 | ||
27 | /* Re-define some string functions for Python >= 3.0. */ | |
28 | #if PY_VERSION_HEX >= 0x03000000 | |
29 | #define PyString_AsString PyBytes_AsString | |
30 | #define PyString_FromString PyBytes_FromString | |
31 | #define PyString_Check PyBytes_Check | |
32 | #endif | |
33 | ||
34 | /* The list of protocol decoders. */ | |
35 | static GSList *list_pds = NULL; | |
36 | ||
37 | /* | |
38 | * Here's a quick overview of Python/C API reference counting. | |
39 | * | |
40 | * Check the Python/C API docs for what type of reference a function returns. | |
41 | * | |
42 | * - If it returns a "new reference", you're responsible to Py_XDECREF() it. | |
43 | * | |
44 | * - If it returns a "borrowed reference", you MUST NOT Py_XDECREF() it. | |
45 | * | |
46 | * - If a function "steals" a reference, you no longer are responsible for | |
47 | * Py_XDECREF()ing it (someone else will do it for you at some point). | |
48 | */ | |
49 | ||
50 | static int srd_load_decoder(const char *name, struct srd_decoder **dec); | |
51 | ||
52 | static int _unitsize = 1; | |
53 | ||
54 | static PyObject* | |
55 | emb_put(PyObject *self, PyObject *args) | |
56 | { | |
57 | PyObject *arg; | |
58 | ||
59 | (void)self; | |
60 | ||
61 | if (!PyArg_ParseTuple(args, "O:put", &arg)) | |
62 | return NULL; | |
63 | ||
64 | fprintf(stdout, "sigrok.put() called by decoder:\n"); | |
65 | PyObject_Print(arg, stdout, Py_PRINT_RAW); | |
66 | puts(""); | |
67 | ||
68 | Py_RETURN_NONE; | |
69 | } | |
70 | ||
71 | static PyMethodDef EmbMethods[] = { | |
72 | {"put", emb_put, METH_VARARGS, | |
73 | "Accepts a dictionary with the following keys: time, duration, data"}, | |
74 | {NULL, NULL, 0, NULL} | |
75 | }; | |
76 | ||
77 | /** | |
78 | * Initialize libsigrokdecode. | |
79 | * | |
80 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
81 | */ | |
82 | int srd_init(void) | |
83 | { | |
84 | DIR *dir; | |
85 | struct dirent *dp; | |
86 | char *decodername; | |
87 | struct srd_decoder *dec; | |
88 | int ret; | |
89 | ||
90 | /* Py_Initialize() returns void and usually cannot fail. */ | |
91 | Py_Initialize(); | |
92 | ||
93 | Py_InitModule("sigrok", EmbMethods); | |
94 | ||
95 | /* Add search directory for the protocol decoders. */ | |
96 | /* FIXME: Check error code. */ | |
97 | /* FIXME: What happens if this function is called multiple times? */ | |
98 | PyRun_SimpleString("import sys;" | |
99 | "sys.path.append(r'" DECODERS_DIR "');"); | |
100 | ||
101 | if (!(dir = opendir(DECODERS_DIR))) | |
102 | return SRD_ERR_DECODERS_DIR; | |
103 | ||
104 | while ((dp = readdir(dir)) != NULL) { | |
105 | if (!g_str_has_suffix(dp->d_name, ".py")) | |
106 | continue; | |
107 | ||
108 | /* Decoder name == filename (without .py suffix). */ | |
109 | decodername = g_strndup(dp->d_name, strlen(dp->d_name) - 3); | |
110 | ||
111 | /* TODO: Error handling. */ | |
112 | dec = malloc(sizeof(struct srd_decoder)); | |
113 | ||
114 | /* Load the decoder. */ | |
115 | ret = srd_load_decoder(decodername, &dec); | |
116 | if (!ret) | |
117 | { | |
118 | /* Append it to the list of supported/loaded decoders. */ | |
119 | list_pds = g_slist_append(list_pds, dec); | |
120 | } | |
121 | } | |
122 | closedir(dir); | |
123 | ||
124 | return SRD_OK; | |
125 | } | |
126 | ||
127 | /** | |
128 | * Returns the list of supported/loaded protocol decoders. | |
129 | * | |
130 | * This is a GSList containing the names of the decoders as strings. | |
131 | * | |
132 | * @return List of decoders, NULL if none are supported or loaded. | |
133 | */ | |
134 | GSList *srd_list_decoders(void) | |
135 | { | |
136 | return list_pds; | |
137 | } | |
138 | ||
139 | /** | |
140 | * Get the decoder with the specified ID. | |
141 | * | |
142 | * @param id The ID string of the decoder to return. | |
143 | * @return The decoder with the specified ID, or NULL if not found. | |
144 | */ | |
145 | struct srd_decoder *srd_get_decoder_by_id(const char *id) | |
146 | { | |
147 | GSList *l; | |
148 | struct srd_decoder *dec; | |
149 | ||
150 | for (l = srd_list_decoders(); l; l = l->next) { | |
151 | dec = l->data; | |
152 | if (!strcmp(dec->id, id)) | |
153 | return dec; | |
154 | } | |
155 | ||
156 | return NULL; | |
157 | } | |
158 | ||
159 | /** | |
160 | * Helper function to handle Python strings. | |
161 | * | |
162 | * TODO: @param entries. | |
163 | * | |
164 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
165 | * The 'outstr' argument points to a malloc()ed string upon success. | |
166 | */ | |
167 | static int h_str(PyObject *py_res, PyObject *py_mod, | |
168 | const char *key, char **outstr) | |
169 | { | |
170 | PyObject *py_str; | |
171 | char *str; | |
172 | int ret; | |
173 | ||
174 | py_str = PyObject_GetAttrString(py_res, (char *)key); /* NEWREF */ | |
175 | if (!py_str || !PyString_Check(py_str)) { | |
176 | ret = SRD_ERR_PYTHON; /* TODO: More specific error? */ | |
177 | goto err_h_decref_mod; | |
178 | } | |
179 | ||
180 | /* | |
181 | * PyString_AsString()'s returned string refers to an internal buffer | |
182 | * (not a copy), i.e. the data must not be modified, and the memory | |
183 | * must not be free()'d. | |
184 | */ | |
185 | if (!(str = PyString_AsString(py_str))) { | |
186 | ret = SRD_ERR_PYTHON; /* TODO: More specific error? */ | |
187 | goto err_h_decref_str; | |
188 | } | |
189 | ||
190 | if (!(*outstr = g_strdup(str))) { | |
191 | ret = SRD_ERR_MALLOC; | |
192 | goto err_h_decref_str; | |
193 | } | |
194 | ||
195 | Py_XDECREF(py_str); | |
196 | ||
197 | return SRD_OK; | |
198 | ||
199 | err_h_decref_str: | |
200 | Py_XDECREF(py_str); | |
201 | err_h_decref_mod: | |
202 | Py_XDECREF(py_mod); | |
203 | ||
204 | if (PyErr_Occurred()) | |
205 | PyErr_Print(); /* Returns void. */ | |
206 | ||
207 | return ret; | |
208 | } | |
209 | ||
210 | /** | |
211 | * TODO | |
212 | * | |
213 | * @param name TODO | |
214 | * | |
215 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
216 | */ | |
217 | static int srd_load_decoder(const char *name, | |
218 | struct srd_decoder **dec) | |
219 | { | |
220 | struct srd_decoder *d; | |
221 | PyObject *py_mod, *py_res; | |
222 | int r; | |
223 | fprintf(stdout, "%s: %s\n", __func__, name); | |
224 | ||
225 | /* "Import" the Python module. */ | |
226 | if (!(py_mod = PyImport_ImportModule(name))) { /* NEWREF */ | |
227 | PyErr_Print(); /* Returns void. */ | |
228 | return SRD_ERR_PYTHON; /* TODO: More specific error? */ | |
229 | } | |
230 | ||
231 | /* Get the 'Decoder' class as Python object. */ | |
232 | py_res = PyObject_GetAttrString(py_mod, "Decoder"); /* NEWREF */ | |
233 | if (!py_res) { | |
234 | if (PyErr_Occurred()) | |
235 | PyErr_Print(); /* Returns void. */ | |
236 | Py_XDECREF(py_mod); | |
237 | fprintf(stderr, "Decoder class not found in PD module %s\n", name); | |
238 | return SRD_ERR_PYTHON; /* TODO: More specific error? */ | |
239 | } | |
240 | ||
241 | if (!(d = malloc(sizeof(struct srd_decoder)))) | |
242 | return SRD_ERR_MALLOC; | |
243 | ||
244 | /* We'll just use the name of the module for the id */ | |
245 | d->id = strdup(name); | |
246 | ||
247 | if ((r = h_str(py_res, py_mod, "name", &(d->name))) < 0) | |
248 | return r; | |
249 | ||
250 | if ((r = h_str(py_res, py_mod, "longname", | |
251 | &(d->longname))) < 0) | |
252 | return r; | |
253 | ||
254 | if ((r = h_str(py_res, py_mod, "desc", &(d->desc))) < 0) | |
255 | return r; | |
256 | ||
257 | if ((r = h_str(py_res, py_mod, "longdesc", | |
258 | &(d->longdesc))) < 0) | |
259 | return r; | |
260 | ||
261 | if ((r = h_str(py_res, py_mod, "author", &(d->author))) < 0) | |
262 | return r; | |
263 | ||
264 | if ((r = h_str(py_res, py_mod, "email", &(d->email))) < 0) | |
265 | return r; | |
266 | ||
267 | if ((r = h_str(py_res, py_mod, "license", &(d->license))) < 0) | |
268 | return r; | |
269 | ||
270 | d->py_mod = py_mod; | |
271 | d->py_decobj = py_res; | |
272 | ||
273 | /* TODO: Handle func, inputformats, outputformats. */ | |
274 | /* Note: They must at least be set to NULL, will segfault otherwise. */ | |
275 | d->func = NULL; | |
276 | d->inputformats = NULL; | |
277 | d->outputformats = NULL; | |
278 | ||
279 | *dec = d; | |
280 | ||
281 | return SRD_OK; | |
282 | } | |
283 | ||
284 | struct srd_decoder_instance *srd_instance_new(const char *id) | |
285 | { | |
286 | struct srd_decoder *dec = srd_get_decoder_by_id(id); | |
287 | struct srd_decoder_instance *di = g_malloc(sizeof(*di)); | |
288 | PyObject *py_args, *py_value; | |
289 | ||
290 | /* Create a Python tuple of size 1. */ | |
291 | if (!(py_args = PyTuple_New(0))) { /* NEWREF */ | |
292 | if (PyErr_Occurred()) | |
293 | PyErr_Print(); /* Returns void. */ | |
294 | ||
295 | return NULL; /* TODO: More specific error? */ | |
296 | } | |
297 | ||
298 | py_value = Py_BuildValue("{sssisd}", | |
299 | "driver", "demo", | |
300 | "unitsize", _unitsize, //FIXME: Pass in a unitsize that matches the selected LA | |
301 | "starttime", 129318231823.0 //TODO: Fill with something reasonable. | |
302 | ); | |
303 | ||
304 | /* Create an instance of the Decoder class */ | |
305 | di->py_instance = PyObject_Call(dec->py_decobj, py_args, py_value); | |
306 | if (!di->py_instance) { | |
307 | if (PyErr_Occurred()) | |
308 | PyErr_Print(); /* Returns void. */ | |
309 | Py_XDECREF(py_args); | |
310 | Py_XDECREF(py_value); /* TODO: Ref. stolen upon error? */ | |
311 | return NULL; /* TODO: More specific error? */ | |
312 | } | |
313 | ||
314 | Py_XDECREF(py_args); | |
315 | Py_XDECREF(py_value); | |
316 | ||
317 | return di; | |
318 | } | |
319 | ||
320 | /** | |
321 | * Run the specified decoder function. | |
322 | * | |
323 | * @param dec TODO | |
324 | * @param inbuf TODO | |
325 | * @param inbuflen TODO | |
326 | * @param outbuf TODO | |
327 | * @param outbuflen TODO | |
328 | * | |
329 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
330 | */ | |
331 | int srd_run_decoder(struct srd_decoder_instance *dec, | |
332 | uint8_t *inbuf, uint64_t inbuflen, | |
333 | uint8_t **outbuf, uint64_t *outbuflen) | |
334 | { | |
335 | PyObject *py_instance, *py_value, *py_res; | |
336 | int r, ret; | |
337 | ||
338 | /* FIXME: Don't have a timebase available here. Make one up. */ | |
339 | static int _timehack = 0; | |
340 | _timehack += inbuflen; | |
341 | ||
342 | /* TODO: Use #defines for the return codes. */ | |
343 | ||
344 | /* Return an error upon unusable input. */ | |
345 | if (dec == NULL) | |
346 | return SRD_ERR_ARGS; /* TODO: More specific error? */ | |
347 | if (inbuf == NULL) | |
348 | return SRD_ERR_ARGS; /* TODO: More specific error? */ | |
349 | if (inbuflen == 0) /* No point in working on empty buffers. */ | |
350 | return SRD_ERR_ARGS; /* TODO: More specific error? */ | |
351 | if (outbuf == NULL) | |
352 | return SRD_ERR_ARGS; /* TODO: More specific error? */ | |
353 | if (outbuflen == NULL) | |
354 | return SRD_ERR_ARGS; /* TODO: More specific error? */ | |
355 | ||
356 | /* TODO: Error handling. */ | |
357 | py_instance = dec->py_instance; | |
358 | Py_XINCREF(py_instance); | |
359 | ||
360 | /* Get the input buffer as Python "string" (byte array). */ | |
361 | /* TODO: int vs. uint64_t for 'inbuflen'? */ | |
362 | ||
363 | py_value = Py_BuildValue("{sisiss#}", | |
364 | "time", _timehack, | |
365 | "duration", 10, | |
366 | "data", inbuf, inbuflen / _unitsize | |
367 | ); | |
368 | ||
369 | if (!(py_res = PyObject_CallMethod(py_instance, "decode", | |
370 | "O", py_value))) { /* NEWREF */ | |
371 | ret = SRD_ERR_PYTHON; /* TODO: More specific error? */ | |
372 | goto err_run_decref_args; | |
373 | } | |
374 | ||
375 | ||
376 | ret = SRD_OK; | |
377 | ||
378 | Py_XDECREF(py_res); | |
379 | err_run_decref_args: | |
380 | Py_XDECREF(py_value); | |
381 | ||
382 | if (PyErr_Occurred()) | |
383 | PyErr_Print(); /* Returns void. */ | |
384 | ||
385 | return ret; | |
386 | } | |
387 | ||
388 | /** | |
389 | * TODO | |
390 | */ | |
391 | static int srd_unload_decoder(struct srd_decoder *dec) | |
392 | { | |
393 | g_free(dec->id); | |
394 | g_free(dec->name); | |
395 | g_free(dec->desc); | |
396 | g_free(dec->func); | |
397 | ||
398 | /* TODO: Free everything in inputformats and outputformats. */ | |
399 | ||
400 | if (dec->inputformats != NULL) | |
401 | g_slist_free(dec->inputformats); | |
402 | if (dec->outputformats != NULL) | |
403 | g_slist_free(dec->outputformats); | |
404 | ||
405 | Py_XDECREF(dec->py_decobj); | |
406 | Py_XDECREF(dec->py_mod); | |
407 | ||
408 | return SRD_OK; | |
409 | } | |
410 | ||
411 | /** | |
412 | * TODO | |
413 | */ | |
414 | static int srd_unload_all_decoders(void) | |
415 | { | |
416 | GSList *l; | |
417 | struct srd_decoder *dec; | |
418 | ||
419 | for (l = srd_list_decoders(); l; l = l->next) { | |
420 | dec = l->data; | |
421 | /* TODO: Error handling. */ | |
422 | srd_unload_decoder(dec); | |
423 | } | |
424 | ||
425 | return SRD_OK; | |
426 | } | |
427 | ||
428 | /** | |
429 | * Shutdown libsigrokdecode. | |
430 | * | |
431 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
432 | */ | |
433 | int srd_exit(void) | |
434 | { | |
435 | /* Unload/free all decoders, and then the list of decoders itself. */ | |
436 | /* TODO: Error handling. */ | |
437 | srd_unload_all_decoders(); | |
438 | g_slist_free(list_pds); | |
439 | ||
440 | /* Py_Finalize() returns void, any finalization errors are ignored. */ | |
441 | Py_Finalize(); | |
442 | ||
443 | return SRD_OK; | |
444 | } |