2 * This file is part of the sigrok project.
4 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
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.
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.
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
22 #include <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */
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
34 /* The list of protocol decoders. */
35 static GSList *list_pds = NULL;
36 /* The list of protocol decoder instances: struct srd_decoder_instance */
37 static GSList *decoders;
40 * Here's a quick overview of Python/C API reference counting.
42 * Check the Python/C API docs for what type of reference a function returns.
44 * - If it returns a "new reference", you're responsible to Py_XDECREF() it.
46 * - If it returns a "borrowed reference", you MUST NOT Py_XDECREF() it.
48 * - If a function "steals" a reference, you no longer are responsible for
49 * Py_XDECREF()ing it (someone else will do it for you at some point).
52 static int srd_load_decoder(PyObject *py_res);
54 static PyObject *emb_register(PyObject *self, PyObject *args)
60 if (!PyArg_ParseTuple(args, "O:decoder", &arg))
63 srd_load_decoder(arg);
68 static PyObject *emb_put(PyObject *self, PyObject *args)
74 if (!PyArg_ParseTuple(args, "O:put", &arg))
77 PyObject_Print(arg, stdout, Py_PRINT_RAW);
83 static PyMethodDef EmbMethods[] = {
84 {"register", emb_register, METH_VARARGS,
85 "Register a protocol decoder object with libsigrokdecode."},
86 {"put", emb_put, METH_VARARGS,
87 "Accepts a dictionary with the following keys: time, duration, data"},
92 * Initialize libsigrokdecode.
94 * This initializes the Python interpreter, and creates and initializes
95 * a "sigrok" Python module with a single put() method.
97 * Then, it searches for sigrok protocol decoder files (*.py) in the
98 * "decoders" subdirectory of the the sigrok installation directory.
99 * All decoders that are found are loaded into memory and added to an
100 * internal list of decoders, which can be queried via srd_list_decoders().
102 * The caller is responsible for calling the clean-up function srd_exit(),
103 * which will properly shut down libsigrokdecode and free its allocated memory.
105 * Multiple calls to srd_init(), without calling srd_exit() inbetween,
108 * @return SRD_OK upon success, a (negative) error code otherwise.
109 * Upon Python errors, return SRD_ERR_PYTHON. If the sigrok decoders
110 * directory cannot be accessed, return SRD_ERR_DECODERS_DIR.
111 * If not enough memory could be allocated, return SRD_ERR_MALLOC.
118 struct srd_decoder *dec;
121 /* Py_Initialize() returns void and usually cannot fail. */
124 /* TODO: Use Py_InitModule3() to add a docstring? */
125 if (!Py_InitModule("sigrok", EmbMethods)) {
126 Py_Finalize(); /* Returns void. */
127 return SRD_ERR_PYTHON;
130 /* Add search directory for the protocol decoders. */
131 /* FIXME: What happens if this function is called multiple times? */
132 ret = PyRun_SimpleString("import sys;"
133 "sys.path.append(r'" DECODERS_DIR "');");
135 Py_Finalize(); /* Returns void. */
136 return SRD_ERR_PYTHON;
139 if (!(dir = opendir(DECODERS_DIR))) {
140 Py_Finalize(); /* Returns void. */
141 return SRD_ERR_DECODERS_DIR;
144 while ((dp = readdir(dir)) != NULL) {
145 /* Ignore filenames which don't end with ".py". */
146 if (!g_str_has_suffix(dp->d_name, ".py"))
149 /* Decoder name == filename (without .py suffix). */
150 decodername = g_strndup(dp->d_name, strlen(dp->d_name) - 3);
152 /* TODO: Error handling. Use g_try_malloc(). */
153 if (!(dec = malloc(sizeof(struct srd_decoder)))) {
154 Py_Finalize(); /* Returns void. */
155 return SRD_ERR_MALLOC;
158 /* Load the decoder. */
159 /* "Import" the Python module. */
161 if (!(py_mod = PyImport_ImportModule(decodername))) { /* NEWREF */
162 PyErr_Print(); /* Returns void. */
163 return SRD_ERR_PYTHON; /* TODO: More specific error? */
165 /* We release here. If any decoders were registered they
166 * will hold references. */
175 * Returns the list of supported/loaded protocol decoders.
177 * This is a GSList containing the names of the decoders as strings.
179 * @return List of decoders, NULL if none are supported or loaded.
181 GSList *srd_list_decoders(void)
187 * Get the decoder with the specified ID.
189 * @param id The ID string of the decoder to return.
190 * @return The decoder with the specified ID, or NULL if not found.
192 struct srd_decoder *srd_get_decoder_by_id(const char *id)
195 struct srd_decoder *dec;
197 for (l = srd_list_decoders(); l; l = l->next) {
199 if (!strcmp(dec->id, id))
207 * Helper function to handle Python strings.
209 * TODO: @param entries.
211 * @return SRD_OK upon success, a (negative) error code otherwise.
212 * The 'outstr' argument points to a malloc()ed string upon success.
214 static int h_str(PyObject *py_res, const char *key, char **outstr)
220 py_str = PyObject_GetAttrString(py_res, (char *)key); /* NEWREF */
221 if (!py_str || !PyString_Check(py_str)) {
222 ret = SRD_ERR_PYTHON; /* TODO: More specific error? */
223 goto err_h_decref_mod;
227 * PyString_AsString()'s returned string refers to an internal buffer
228 * (not a copy), i.e. the data must not be modified, and the memory
229 * must not be free()'d.
231 if (!(str = PyString_AsString(py_str))) {
232 ret = SRD_ERR_PYTHON; /* TODO: More specific error? */
233 goto err_h_decref_str;
236 if (!(*outstr = g_strdup(str))) {
237 ret = SRD_ERR_MALLOC;
238 goto err_h_decref_str;
249 if (PyErr_Occurred())
250 PyErr_Print(); /* Returns void. */
260 * @return SRD_OK upon success, a (negative) error code otherwise.
262 static int srd_load_decoder(PyObject *py_res)
264 struct srd_decoder *d;
267 if (!(d = malloc(sizeof(struct srd_decoder))))
268 return SRD_ERR_MALLOC;
270 if ((r = h_str(py_res, "id", &(d->id))) < 0)
273 if ((r = h_str(py_res, "name", &(d->name))) < 0)
276 if ((r = h_str(py_res, "longname",
277 &(d->longname))) < 0)
280 if ((r = h_str(py_res, "desc", &(d->desc))) < 0)
283 if ((r = h_str(py_res, "longdesc",
284 &(d->longdesc))) < 0)
287 if ((r = h_str(py_res, "author", &(d->author))) < 0)
290 if ((r = h_str(py_res, "email", &(d->email))) < 0)
293 if ((r = h_str(py_res, "license", &(d->license))) < 0)
296 d->py_decobj = py_res;
298 /* TODO: Handle func, inputformats, outputformats. */
299 /* Note: They must at least be set to NULL, will segfault otherwise. */
301 d->inputformats = NULL;
302 d->outputformats = NULL;
305 fprintf(stderr, "srd: registered '%s'\n", d->id);
306 list_pds = g_slist_append(list_pds, d);
311 /** Create a new decoder instance and add to session. */
312 struct srd_decoder_instance *srd_instance_new(const char *id)
314 struct srd_decoder *dec;
315 struct srd_decoder_instance *di;
318 if (!(dec = srd_get_decoder_by_id(id)))
321 /* TODO: Error handling. Use g_try_malloc(). */
322 di = g_malloc(sizeof(*di));
324 /* Create an empty Python tuple. */
325 if (!(py_args = PyTuple_New(0))) { /* NEWREF */
326 if (PyErr_Occurred())
327 PyErr_Print(); /* Returns void. */
329 return NULL; /* TODO: More specific error? */
332 /* Create an instance of the 'Decoder' class. */
333 di->py_instance = PyObject_Call(dec->py_decobj, py_args, NULL);
334 if (!di->py_instance) {
335 if (PyErr_Occurred())
336 PyErr_Print(); /* Returns void. */
338 return NULL; /* TODO: More specific error? */
341 /* Append to list of PD instances */
342 decoders = g_slist_append(decoders, di);
349 int srd_instance_set_probe(struct srd_decoder_instance *di,
350 const char *probename, int num)
352 PyObject *probedict, *probenum;
354 probedict = PyObject_GetAttrString(di->py_instance, "probes"); /* NEWREF */
356 if (PyErr_Occurred())
357 PyErr_Print(); /* Returns void. */
359 return SRD_ERR_PYTHON; /* TODO: More specific error? */
362 probenum = PyInt_FromLong(num);
363 PyMapping_SetItemString(probedict, (char *)probename, probenum);
365 Py_XDECREF(probenum);
366 Py_XDECREF(probedict);
371 /** Start decoding session. Feed metadata to decoder instances. */
372 int srd_session_start(const char *driver, int unitsize, uint64_t starttime,
377 for (d = decoders; d; d = d->next) {
378 struct srd_decoder_instance *di = d->data;
379 /* TODO: Error handling. */
380 if (!(py_res = PyObject_CallMethod(di->py_instance, "start",
383 "unitsize", (long)unitsize,
384 "starttime", (long)starttime,
385 "samplerate", (long)samplerate))) {
386 if (PyErr_Occurred())
387 PyErr_Print(); /* Returns void. */
389 return SRD_ERR_PYTHON; /* TODO: More specific error? */
398 * Run the specified decoder function.
402 * @param inbuflen TODO
404 * @param outbuflen TODO
406 * @return SRD_OK upon success, a (negative) error code otherwise.
408 static int srd_run_decoder(struct srd_decoder_instance *dec,
409 uint8_t *inbuf, uint64_t inbuflen)
411 PyObject *py_instance, *py_res;
412 /* FIXME: Don't have a timebase available here. Make one up. */
413 static int _timehack = 0;
415 _timehack += inbuflen;
417 /* TODO: Use #defines for the return codes. */
419 /* Return an error upon unusable input. */
421 return SRD_ERR_ARGS; /* TODO: More specific error? */
423 return SRD_ERR_ARGS; /* TODO: More specific error? */
424 if (inbuflen == 0) /* No point in working on empty buffers. */
425 return SRD_ERR_ARGS; /* TODO: More specific error? */
427 /* TODO: Error handling. */
428 py_instance = dec->py_instance;
429 Py_XINCREF(py_instance);
431 if (!(py_res = PyObject_CallMethod(py_instance, "decode",
435 "data", inbuf, inbuflen))) { /* NEWREF */
436 if (PyErr_Occurred())
437 PyErr_Print(); /* Returns void. */
439 return SRD_ERR_PYTHON; /* TODO: More specific error? */
446 /* Feed logic samples to decoder session. */
447 int srd_session_feed(uint8_t *inbuf, uint64_t inbuflen)
450 for (d = decoders; d; d = d->next) {
451 /* TODO: Error handling. */
453 int ret = srd_run_decoder(d->data, inbuf, inbuflen);
456 /* This probably shouldn't fail catastrophically. */
457 fprintf(stderr, "Decoder runtime error (%d)\n", ret);
467 static int srd_unload_decoder(struct srd_decoder *dec)
474 /* TODO: Free everything in inputformats and outputformats. */
476 if (dec->inputformats != NULL)
477 g_slist_free(dec->inputformats);
478 if (dec->outputformats != NULL)
479 g_slist_free(dec->outputformats);
481 Py_XDECREF(dec->py_decobj);
483 /* TODO: (g_)free dec itself? */
491 static int srd_unload_all_decoders(void)
494 struct srd_decoder *dec;
496 for (l = srd_list_decoders(); l; l = l->next) {
498 /* TODO: Error handling. */
499 srd_unload_decoder(dec);
506 * Shutdown libsigrokdecode.
508 * This frees all the memory allocated for protocol decoders and shuts down
509 * the Python interpreter.
511 * This function should only be called if there was a (successful!) invocation
512 * of srd_init() before. Calling this function multiple times in a row, without
513 * any successful srd_init() calls inbetween, is not allowed.
515 * @return SRD_OK upon success, a (negative) error code otherwise.
519 /* Unload/free all decoders, and then the list of decoders itself. */
520 /* TODO: Error handling. */
521 srd_unload_all_decoders();
522 g_slist_free(list_pds);
524 /* Py_Finalize() returns void, any finalization errors are ignored. */