[libsigrokdecode.git] / decoder.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"
#include "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include "sigrokdecode-internal.h"
#include <glib.h>

/* The list of protocol decoders. */
GSList *pd_list = NULL;

/* lives in module_sigrokdecode.c */
extern PyObject *mod_sigrokdecode;


/**
 * Returns the list of supported/loaded protocol decoders.
 *
 * This is a GSList containing the names of the decoders as strings.
 *
 * @return List of decoders, NULL if none are supported or loaded.
 */
GSList *srd_list_decoders(void)
{

	return pd_list;
}


/**
 * Get the decoder with the specified ID.
 *
 * @param id The ID string of the decoder to return.
 * @return The decoder with the specified ID, or NULL if not found.
 */
struct srd_decoder *srd_get_decoder_by_id(const char *id)
{
	GSList *l;
	struct srd_decoder *dec;

	for (l = srd_list_decoders(); l; l = l->next) {
		dec = l->data;
		if (!strcmp(dec->id, id))
			return dec;
	}

	return NULL;
}


static int get_probes(struct srd_decoder *d, char *attr, GSList **pl)
{
	PyObject *py_probelist, *py_entry;
	struct srd_probe *p;
	int ret, num_probes, i;

	if (!PyObject_HasAttrString(d->py_dec, attr))
		/* No probes of this type specified. */
		return SRD_OK;

	ret = SRD_ERR_PYTHON;
	py_probelist = py_entry = NULL;

	py_probelist = PyObject_GetAttrString(d->py_dec, attr);
	if (!PyList_Check(py_probelist)) {
		srd_err("Protocol decoder %s %s attribute is not "
				"a list.", d->name, attr);
		goto err_out;
	}

	num_probes = PyList_Size(py_probelist);
	if (num_probes == 0)
		/* Empty probelist. */
		return SRD_OK;

	for (i = 0; i < num_probes; i++) {
		py_entry = PyList_GetItem(py_probelist, i);
		if (!PyDict_Check(py_entry)) {
			srd_err("Protocol decoder %s %s attribute is not "
					"a list with dict elements.", d->name, attr);
			goto err_out;
		}

		if (!(p = g_try_malloc(sizeof(struct srd_probe)))) {
			ret = SRD_ERR_MALLOC;
			goto err_out;
		}

		if ((py_dictitem_as_str(py_entry, "id", &p->id)) != SRD_OK)
			goto err_out;
		if ((py_dictitem_as_str(py_entry, "name", &p->name)) != SRD_OK)
			goto err_out;
		if ((py_dictitem_as_str(py_entry, "desc", &p->desc)) != SRD_OK)
			goto err_out;
		p->order = i;

		*pl = g_slist_append(*pl, p);
	}
	ret = SRD_OK;

err_out:
	Py_DecRef(py_entry);
	Py_DecRef(py_probelist);

	return ret;
}

/**
 * Load a protocol decoder module into the embedded Python interpreter.
 *
 * @param name The module name to be loaded.
 * @param dec Pointer to the struct srd_decoder filled with the loaded module.
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 */
int srd_load_decoder(const char *name, struct srd_decoder **dec)
{
	PyObject *py_basedec, *py_method, *py_attr, *py_annlist, *py_ann;
	struct srd_decoder *d;
	int alen, ret, i;
	char **ann;

	srd_dbg("Loading module '%s'.", name);

	py_basedec = py_method = py_attr = NULL;

	if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
		srd_dbg("Failed to malloc struct srd_decoder.");
		ret = SRD_ERR_MALLOC;
		goto err_out;
	}

	ret = SRD_ERR_PYTHON;

	/* Import the Python module. */
	if (!(d->py_mod = PyImport_ImportModule(name))) {
		catch_exception("import of '%s' failed.", name);
		goto err_out;
	}

	/* Get the 'Decoder' class as Python object. */
	if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) {
		/* This generated an AttributeError exception. */
		PyErr_Clear();
		srd_err("Decoder class not found in protocol decoder %s.", name);
		goto err_out;
	}

	if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) {
		srd_dbg("sigrokdecode module not loaded.");
		goto err_out;
	}

	if (!PyObject_IsSubclass(d->py_dec, py_basedec)) {
		srd_err("Decoder class in protocol decoder module %s is not "
				"a subclass of sigrokdecode.Decoder.", name);
		goto err_out;
	}
	Py_CLEAR(py_basedec);

	/* Check for a proper start() method. */
	if (!PyObject_HasAttrString(d->py_dec, "start")) {
		srd_err("Protocol decoder %s has no start() method Decoder "
				"class.", name);
		goto err_out;
	}
	py_method = PyObject_GetAttrString(d->py_dec, "start");
	if (!PyFunction_Check(py_method)) {
		srd_err("Protocol decoder %s Decoder class attribute 'start' "
				"is not a method.", name);
		goto err_out;
	}
	Py_CLEAR(py_method);

	/* Check for a proper decode() method. */
	if (!PyObject_HasAttrString(d->py_dec, "decode")) {
		srd_err("Protocol decoder %s has no decode() method Decoder "
				"class.", name);
		goto err_out;
	}
	py_method = PyObject_GetAttrString(d->py_dec, "decode");
	if (!PyFunction_Check(py_method)) {
		srd_err("Protocol decoder %s Decoder class attribute 'decode' "
				"is not a method.", name);
		goto err_out;
	}
	Py_CLEAR(py_method);

	/* If present, options must be a dictionary. */
	if (PyObject_HasAttrString(d->py_dec, "options")) {
		py_attr = PyObject_GetAttrString(d->py_dec, "options");
		if (!PyDict_Check(py_attr)) {
			srd_err("Protocol decoder %s options attribute is not "
					"a dictionary.", d->name);
			Py_DecRef(py_attr);
			goto err_out;
		}
		Py_DecRef(py_attr);
	}

	/* Check and import required probes. */
	if (get_probes(d, "probes", &d->probes) != SRD_OK)
		goto err_out;

	/* Check and import optional probes. */
	if (get_probes(d, "optional_probes", &d->opt_probes) != SRD_OK)
		goto err_out;

	/* Store required fields in newly allocated strings. */
	if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK)
		goto err_out;

	if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK)
		goto err_out;

	if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK)
		goto err_out;

	if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK)
		goto err_out;

	if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK)
		goto err_out;

	/* TODO: Handle inputformats, outputformats. */
	d->inputformats = NULL;
	d->outputformats = NULL;

	/* Convert class annotation attribute to GSList of **char */
	d->annotations = NULL;
	if (PyObject_HasAttrString(d->py_dec, "annotations")) {
		py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
		if (!PyList_Check(py_annlist)) {
			srd_err("Protocol decoder module %s annotations should be a list.", name);
			goto err_out;
		}
		alen = PyList_Size(py_annlist);
		for (i = 0; i < alen; i++) {
			py_ann = PyList_GetItem(py_annlist, i);
			if (!PyList_Check(py_ann) || PyList_Size(py_ann) != 2) {
				srd_err("Protocol decoder module %s annotation %d should "
						"be a list with two elements.", name, i+1);
				goto err_out;
			}

			if (py_strlist_to_char(py_ann, &ann) != SRD_OK) {
				goto err_out;
			}
			d->annotations = g_slist_append(d->annotations, ann);
		}
	}

	*dec = d;
	ret = SRD_OK;

err_out:
	if (ret != SRD_OK) {
		Py_XDECREF(py_method);
		Py_XDECREF(py_basedec);
		Py_XDECREF(d->py_dec);
		Py_XDECREF(d->py_mod);
		g_free(d);
	}

	return ret;
}

char *srd_decoder_doc(struct srd_decoder *dec)
{
	PyObject *py_str;
	char *doc;

	if (!PyObject_HasAttrString(dec->py_mod, "__doc__"))
		return NULL;

	if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) {
		catch_exception("");
		return NULL;
	}

	doc = NULL;
	if (py_str != Py_None)
		py_str_as_str(py_str, &doc);
	Py_DecRef(py_str);

	return doc;
}


static void free_probes(GSList *probelist)
{
	GSList *l;
	struct srd_probe *p;

	if (probelist == NULL)
		return;

	for (l = probelist; l; l = l->next) {
		p = l->data;
		g_free(p->id);
		g_free(p->name);
		g_free(p->desc);
		g_free(p);
	}
	g_slist_free(probelist);

}

/**
 * Unload decoder module.
 *
 * @param dec The struct srd_decoder to be unloaded.
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 */
int srd_unload_decoder(struct srd_decoder *dec)
{

	srd_dbg("unloading decoder %s", dec->name);

	/* Since any instances of this decoder need to be released as well,
	 * but they could be anywhere in the stack, just free the entire
	 * stack. A frontend reloading a decoder thus has to restart all
	 * instances, and rebuild the stack. */
	srd_instance_free_all(NULL);

	free_probes(dec->probes);
	free_probes(dec->opt_probes);
	g_free(dec->id);
	g_free(dec->name);
	g_free(dec->longname);
	g_free(dec->desc);
	g_free(dec->license);

	/* TODO: Free everything in inputformats and outputformats. */
	if (dec->inputformats != NULL)
		g_slist_free(dec->inputformats);
	if (dec->outputformats != NULL)
		g_slist_free(dec->outputformats);

	/* The module's Decoder class. */
	Py_XDECREF(dec->py_dec);
	/* The module itself. */
	Py_XDECREF(dec->py_mod);

	/* TODO: (g_)free dec itself? */

	return SRD_OK;
}

int srd_load_all_decoders(void)
{
	GDir *dir;
	GError *error;
	struct srd_decoder *dec;
	int ret;
	const gchar *direntry;
	char *decodername;

	if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) {
		return SRD_ERR_DECODERS_DIR;
	}

	while ((direntry = g_dir_read_name(dir)) != NULL) {
		/* The decoder name is the PD directory name (e.g. "i2c"). */
		decodername = g_strdup(direntry);

		if ((ret = srd_load_decoder(decodername, &dec)) == SRD_OK) {
			/* Append it to the list of supported/loaded decoders. */
			pd_list = g_slist_append(pd_list, dec);
		}
	}
	g_dir_close(dir);

	return SRD_OK;
}

/**
 * TODO
 */
int srd_unload_all_decoders(void)
{
	GSList *l;
	struct srd_decoder *dec;

	for (l = srd_list_decoders(); l; l = l->next) {
		dec = l->data;
		srd_unload_decoder(dec);
	}

	return SRD_OK;
}
Commit	Line	Data
b2c19614 BV	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
4fadb128	5	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
b2c19614 BV	6	*
	7	* This program is free software: you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation, either version 3 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
	21	#include "config.h"
73191416	22	#include "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
15969949	23	#include "sigrokdecode-internal.h"
eb2bbd66	24	#include <glib.h>
b2c19614 BV	25
b2c19614 BV	26	/* The list of protocol decoders. */
e5080882	27	GSList *pd_list = NULL;
b2c19614	28
451680f1 BV	29	/* lives in module_sigrokdecode.c */
	30	extern PyObject *mod_sigrokdecode;
	31
b2c19614 BV	32
	33	/**
	34	* Returns the list of supported/loaded protocol decoders.
	35	*
	36	* This is a GSList containing the names of the decoders as strings.
	37	*
	38	* @return List of decoders, NULL if none are supported or loaded.
	39	*/
	40	GSList *srd_list_decoders(void)
	41	{
	42
e5080882	43	return pd_list;
b2c19614 BV	44	}
	45
	46
	47	/**
	48	* Get the decoder with the specified ID.
	49	*
	50	* @param id The ID string of the decoder to return.
	51	* @return The decoder with the specified ID, or NULL if not found.
	52	*/
	53	struct srd_decoder srd_get_decoder_by_id(const char id)
	54	{
	55	GSList *l;
	56	struct srd_decoder *dec;
	57
	58	for (l = srd_list_decoders(); l; l = l->next) {
	59	dec = l->data;
	60	if (!strcmp(dec->id, id))
	61	return dec;
	62	}
	63
	64	return NULL;
	65	}
	66
	67
f38ec285 BV	68	static int get_probes(struct srd_decoder d, char attr, GSList **pl)
	69	{
	70	PyObject py_probelist, py_entry;
	71	struct srd_probe *p;
	72	int ret, num_probes, i;
	73
	74	if (!PyObject_HasAttrString(d->py_dec, attr))
	75	/* No probes of this type specified. */
	76	return SRD_OK;
	77
	78	ret = SRD_ERR_PYTHON;
	79	py_probelist = py_entry = NULL;
	80
	81	py_probelist = PyObject_GetAttrString(d->py_dec, attr);
	82	if (!PyList_Check(py_probelist)) {
	83	srd_err("Protocol decoder %s %s attribute is not "
	84	"a list.", d->name, attr);
	85	goto err_out;
	86	}
	87
	88	num_probes = PyList_Size(py_probelist);
	89	if (num_probes == 0)
	90	/* Empty probelist. */
	91	return SRD_OK;
	92
	93	for (i = 0; i < num_probes; i++) {
	94	py_entry = PyList_GetItem(py_probelist, i);
	95	if (!PyDict_Check(py_entry)) {
	96	srd_err("Protocol decoder %s %s attribute is not "
	97	"a list with dict elements.", d->name, attr);
	98	goto err_out;
	99	}
	100
	101	if (!(p = g_try_malloc(sizeof(struct srd_probe)))) {
	102	ret = SRD_ERR_MALLOC;
	103	goto err_out;
	104	}
	105
	106	if ((py_dictitem_as_str(py_entry, "id", &p->id)) != SRD_OK)
	107	goto err_out;
	108	if ((py_dictitem_as_str(py_entry, "name", &p->name)) != SRD_OK)
	109	goto err_out;
	110	if ((py_dictitem_as_str(py_entry, "desc", &p->desc)) != SRD_OK)
	111	goto err_out;
	112	p->order = i;
	113
	114	pl = g_slist_append(pl, p);
	115	}
	116	ret = SRD_OK;
	117
	118	err_out:
	119	Py_DecRef(py_entry);
	120	Py_DecRef(py_probelist);
	121
	122	return ret;
	123	}
	124
b2c19614	125	/**
64c29e28	126	* Load a protocol decoder module into the embedded Python interpreter.
b2c19614	127	*
15969949 BV	128	* @param name The module name to be loaded.
15969949 BV	129	* @param dec Pointer to the struct srd_decoder filled with the loaded module.
b2c19614 BV	130	*
	131	* @return SRD_OK upon success, a (negative) error code otherwise.
	132	*/
	133	int srd_load_decoder(const char name, struct srd_decoder *dec)
	134	{
11ea8ae1	135	PyObject py_basedec, py_method, py_attr, py_annlist, *py_ann;
b2c19614	136	struct srd_decoder *d;
451680f1	137	int alen, ret, i;
15969949	138	char **ann;
b2c19614	139
7a1712c4	140	srd_dbg("Loading module '%s'.", name);
64c29e28	141
d906d3f9	142	py_basedec = py_method = py_attr = NULL;
b2c19614	143
451680f1	144	if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
7a1712c4	145	srd_dbg("Failed to malloc struct srd_decoder.");
451680f1 BV	146	ret = SRD_ERR_MALLOC;
451680f1 BV	147	goto err_out;
b2c19614 BV	148	}
b2c19614 BV	149
21481b66 BV	150	ret = SRD_ERR_PYTHON;
21481b66 BV	151
451680f1 BV	152	/* Import the Python module. */
451680f1 BV	153	if (!(d->py_mod = PyImport_ImportModule(name))) {
2086c684	154	catch_exception("import of '%s' failed.", name);
451680f1 BV	155	goto err_out;
451680f1 BV	156	}
b2c19614	157
451680f1 BV	158	/* Get the 'Decoder' class as Python object. */
	159	if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) {
	160	/* This generated an AttributeError exception. */
	161	PyErr_Clear();
d906d3f9	162	srd_err("Decoder class not found in protocol decoder %s.", name);
451680f1 BV	163	goto err_out;
451680f1 BV	164	}
b2c19614	165
451680f1	166	if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) {
7a1712c4	167	srd_dbg("sigrokdecode module not loaded.");
451680f1 BV	168	goto err_out;
451680f1 BV	169	}
b2c19614	170
451680f1 BV	171	if (!PyObject_IsSubclass(d->py_dec, py_basedec)) {
451680f1 BV	172	srd_err("Decoder class in protocol decoder module %s is not "
d906d3f9	173	"a subclass of sigrokdecode.Decoder.", name);
451680f1 BV	174	goto err_out;
451680f1 BV	175	}
ad022d94	176	Py_CLEAR(py_basedec);
b2c19614	177
1d552cd3 BV	178	/* Check for a proper start() method. */
	179	if (!PyObject_HasAttrString(d->py_dec, "start")) {
	180	srd_err("Protocol decoder %s has no start() method Decoder "
	181	"class.", name);
	182	goto err_out;
	183	}
	184	py_method = PyObject_GetAttrString(d->py_dec, "start");
	185	if (!PyFunction_Check(py_method)) {
d906d3f9	186	srd_err("Protocol decoder %s Decoder class attribute 'start' "
1d552cd3 BV	187	"is not a method.", name);
	188	goto err_out;
	189	}
ad022d94	190	Py_CLEAR(py_method);
1d552cd3 BV	191
	192	/* Check for a proper decode() method. */
	193	if (!PyObject_HasAttrString(d->py_dec, "decode")) {
	194	srd_err("Protocol decoder %s has no decode() method Decoder "
	195	"class.", name);
	196	goto err_out;
	197	}
	198	py_method = PyObject_GetAttrString(d->py_dec, "decode");
	199	if (!PyFunction_Check(py_method)) {
	200	srd_err("Protocol decoder %s Decoder class attribute 'decode' "
	201	"is not a method.", name);
	202	goto err_out;
	203	}
ad022d94	204	Py_CLEAR(py_method);
1d552cd3	205
11ea8ae1 BV	206	/* If present, options must be a dictionary. */
	207	if (PyObject_HasAttrString(d->py_dec, "options")) {
	208	py_attr = PyObject_GetAttrString(d->py_dec, "options");
	209	if (!PyDict_Check(py_attr)) {
	210	srd_err("Protocol decoder %s options attribute is not "
	211	"a dictionary.", d->name);
ad022d94	212	Py_DecRef(py_attr);
11ea8ae1 BV	213	goto err_out;
	214	}
	215	Py_DecRef(py_attr);
	216	}
	217
f38ec285 BV	218	/* Check and import required probes. */
	219	if (get_probes(d, "probes", &d->probes) != SRD_OK)
	220	goto err_out;
	221
	222	/* Check and import optional probes. */
dcdf4883	223	if (get_probes(d, "optional_probes", &d->opt_probes) != SRD_OK)
f38ec285 BV	224	goto err_out;
	225
	226	/* Store required fields in newly allocated strings. */
21481b66	227	if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK)
451680f1	228	goto err_out;
b2c19614	229
21481b66	230	if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK)
451680f1	231	goto err_out;
b2c19614	232
21481b66	233	if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK)
451680f1	234	goto err_out;
b2c19614	235
21481b66	236	if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK)
451680f1	237	goto err_out;
b2c19614	238
21481b66	239	if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK)
451680f1	240	goto err_out;
b2c19614	241
451680f1	242	/* TODO: Handle inputformats, outputformats. */
b2c19614 BV	243	d->inputformats = NULL;
	244	d->outputformats = NULL;
	245
15969949	246	/* Convert class annotation attribute to GSList of *char /
e97b6ef5	247	d->annotations = NULL;
451680f1 BV	248	if (PyObject_HasAttrString(d->py_dec, "annotations")) {
451680f1 BV	249	py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
15969949	250	if (!PyList_Check(py_annlist)) {
d906d3f9	251	srd_err("Protocol decoder module %s annotations should be a list.", name);
451680f1	252	goto err_out;
15969949 BV	253	}
	254	alen = PyList_Size(py_annlist);
	255	for (i = 0; i < alen; i++) {
	256	py_ann = PyList_GetItem(py_annlist, i);
	257	if (!PyList_Check(py_ann) \|\| PyList_Size(py_ann) != 2) {
d906d3f9 BV	258	srd_err("Protocol decoder module %s annotation %d should "
d906d3f9 BV	259	"be a list with two elements.", name, i+1);
451680f1	260	goto err_out;
15969949 BV	261	}
15969949 BV	262
451680f1	263	if (py_strlist_to_char(py_ann, &ann) != SRD_OK) {
451680f1 BV	264	goto err_out;
451680f1 BV	265	}
e97b6ef5	266	d->annotations = g_slist_append(d->annotations, ann);
15969949 BV	267	}
	268	}
	269
b2c19614	270	*dec = d;
451680f1 BV	271	ret = SRD_OK;
	272
	273	err_out:
	274	if (ret != SRD_OK) {
1d552cd3	275	Py_XDECREF(py_method);
451680f1 BV	276	Py_XDECREF(py_basedec);
	277	Py_XDECREF(d->py_dec);
	278	Py_XDECREF(d->py_mod);
	279	g_free(d);
	280	}
b2c19614	281
451680f1 BV	282	return ret;
	283	}
	284
	285	char srd_decoder_doc(struct srd_decoder dec)
	286	{
e7edca07	287	PyObject *py_str;
451680f1 BV	288	char *doc;
451680f1 BV	289
e7edca07 BV	290	if (!PyObject_HasAttrString(dec->py_mod, "__doc__"))
	291	return NULL;
	292
	293	if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) {
2086c684	294	catch_exception("");
e7edca07 BV	295	return NULL;
	296	}
	297
451680f1	298	doc = NULL;
e7edca07 BV	299	if (py_str != Py_None)
	300	py_str_as_str(py_str, &doc);
	301	Py_DecRef(py_str);
451680f1 BV	302
451680f1 BV	303	return doc;
b2c19614 BV	304	}
	305
	306
fa12a21e BV	307	static void free_probes(GSList *probelist)
	308	{
	309	GSList *l;
	310	struct srd_probe *p;
	311
	312	if (probelist == NULL)
	313	return;
	314
	315	for (l = probelist; l; l = l->next) {
	316	p = l->data;
	317	g_free(p->id);
	318	g_free(p->name);
	319	g_free(p->desc);
	320	g_free(p);
	321	}
	322	g_slist_free(probelist);
	323
	324	}
	325
b2c19614	326	/**
451680f1 BV	327	* Unload decoder module.
451680f1 BV	328	*
fa12a21e	329	* @param dec The struct srd_decoder to be unloaded.
451680f1 BV	330	*
451680f1 BV	331	* @return SRD_OK upon success, a (negative) error code otherwise.
b2c19614 BV	332	*/
	333	int srd_unload_decoder(struct srd_decoder *dec)
	334	{
451680f1	335
fa12a21e BV	336	srd_dbg("unloading decoder %s", dec->name);
	337
	338	/* Since any instances of this decoder need to be released as well,
	339	* but they could be anywhere in the stack, just free the entire
	340	* stack. A frontend reloading a decoder thus has to restart all
	341	* instances, and rebuild the stack. */
	342	srd_instance_free_all(NULL);
	343
	344	free_probes(dec->probes);
dcdf4883	345	free_probes(dec->opt_probes);
b2c19614 BV	346	g_free(dec->id);
b2c19614 BV	347	g_free(dec->name);
b231546d	348	g_free(dec->longname);
b2c19614	349	g_free(dec->desc);
b231546d	350	g_free(dec->license);
b2c19614 BV	351
b2c19614 BV	352	/* TODO: Free everything in inputformats and outputformats. */
b2c19614 BV	353	if (dec->inputformats != NULL)
	354	g_slist_free(dec->inputformats);
	355	if (dec->outputformats != NULL)
	356	g_slist_free(dec->outputformats);
	357
fa12a21e	358	/* The module's Decoder class. */
451680f1	359	Py_XDECREF(dec->py_dec);
fa12a21e	360	/* The module itself. */
b2c19614 BV	361	Py_XDECREF(dec->py_mod);
	362
	363	/* TODO: (g_)free dec itself? */
	364
	365	return SRD_OK;
	366	}
	367
b2c19614 BV	368	int srd_load_all_decoders(void)
b2c19614 BV	369	{
eb2bbd66 BV	370	GDir *dir;
	371	GError *error;
	372	struct srd_decoder *dec;
b2c19614	373	int ret;
eb2bbd66	374	const gchar *direntry;
b2c19614	375	char *decodername;
b2c19614	376
eb2bbd66	377	if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) {
b2c19614 BV	378	return SRD_ERR_DECODERS_DIR;
	379	}
	380
eb2bbd66	381	while ((direntry = g_dir_read_name(dir)) != NULL) {
64c29e28	382	/* The decoder name is the PD directory name (e.g. "i2c"). */
eb2bbd66	383	decodername = g_strdup(direntry);
b2c19614	384
b2c19614 BV	385	if ((ret = srd_load_decoder(decodername, &dec)) == SRD_OK) {
b2c19614 BV	386	/* Append it to the list of supported/loaded decoders. */
e5080882	387	pd_list = g_slist_append(pd_list, dec);
b2c19614 BV	388	}
b2c19614 BV	389	}
eb2bbd66	390	g_dir_close(dir);
b2c19614 BV	391
	392	return SRD_OK;
	393	}
	394
b2c19614 BV	395	/**
	396	* TODO
	397	*/
	398	int srd_unload_all_decoders(void)
	399	{
	400	GSList *l;
	401	struct srd_decoder *dec;
	402
	403	for (l = srd_list_decoders(); l; l = l->next) {
	404	dec = l->data;
b2c19614 BV	405	srd_unload_decoder(dec);
	406	}
	407
	408	return SRD_OK;
	409	}
	410
	411
	412