[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. */
SRD_PRIV GSList *pd_list = NULL;

/* module_sigrokdecode.c */
extern SRD_PRIV 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.
 */
SRD_API GSList *srd_decoders_list(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.
 */
SRD_API struct srd_decoder *srd_decoder_get_by_id(const char *id)
{
	GSList *l;
	struct srd_decoder *dec;

	for (l = srd_decoders_list(); 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)))) {
			srd_err("Failed to g_malloc() 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.
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 */
SRD_API int srd_decoder_load(const char *module_name)
{
	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'.", module_name);

	py_basedec = py_method = py_attr = NULL;

	if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
		srd_dbg("Failed to g_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(module_name))) {
		catch_exception("import of '%s' failed.", module_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.", module_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.", module_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.", module_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.", module_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.", module_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.", module_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.", module_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.", module_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);
		}
	}

	/* Append it to the list of supported/loaded decoders. */
	pd_list = g_slist_append(pd_list, 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;
}

/**
 * Return a protocol decoder's docstring.
 *
 * @param dec The loaded protocol decoder.
 *
 * @return A newly allocated buffer containing the docstring. The caller should
 * free this after use.
 */
SRD_API 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.
 */
SRD_API int srd_decoder_unload(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_inst_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;
}

/**
 * Load all installed protocol decoders.
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 */
SRD_API int srd_decoders_load_all(void)
{
	GDir *dir;
	GError *error;
	const gchar *direntry;

	if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) {
		srd_err("Unable to open %s for reading.", DECODERS_DIR);
		return SRD_ERR_DECODERS_DIR;
	}

	while ((direntry = g_dir_read_name(dir)) != NULL) {
		/* The directory name is the module name (e.g. "i2c"). */
		srd_decoder_load(direntry);
	}
	g_dir_close(dir);

	return SRD_OK;
}

/**
 * Unload all loaded protocol decoders.
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 */
SRD_API int srd_decoders_unload_all(void)
{
	GSList *l;
	struct srd_decoder *dec;

	for (l = srd_decoders_list(); l; l = l->next) {
		dec = l->data;
		srd_decoder_unload(dec);
	}

	return SRD_OK;
}
Commit	Line	Data
	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
	5	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
	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"
	22	#include "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
	23	#include "sigrokdecode-internal.h"
	24	#include <glib.h>
	25
	26	/* The list of protocol decoders. */
	27	SRD_PRIV GSList *pd_list = NULL;
	28
	29	/* module_sigrokdecode.c */
	30	extern SRD_PRIV PyObject *mod_sigrokdecode;
	31
	32	/**
	33	* Returns the list of supported/loaded protocol decoders.
	34	*
	35	* This is a GSList containing the names of the decoders as strings.
	36	*
	37	* @return List of decoders, NULL if none are supported or loaded.
	38	*/
	39	SRD_API GSList *srd_decoders_list(void)
	40	{
	41	return pd_list;
	42	}
	43
	44	/**
	45	* Get the decoder with the specified ID.
	46	*
	47	* @param id The ID string of the decoder to return.
	48	*
	49	* @return The decoder with the specified ID, or NULL if not found.
	50	*/
	51	SRD_API struct srd_decoder srd_decoder_get_by_id(const char id)
	52	{
	53	GSList *l;
	54	struct srd_decoder *dec;
	55
	56	for (l = srd_decoders_list(); l; l = l->next) {
	57	dec = l->data;
	58	if (!strcmp(dec->id, id))
	59	return dec;
	60	}
	61
	62	return NULL;
	63	}
	64
	65	static int get_probes(struct srd_decoder d, char attr, GSList **pl)
	66	{
	67	PyObject py_probelist, py_entry;
	68	struct srd_probe *p;
	69	int ret, num_probes, i;
	70
	71	if (!PyObject_HasAttrString(d->py_dec, attr))
	72	/* No probes of this type specified. */
	73	return SRD_OK;
	74
	75	ret = SRD_ERR_PYTHON;
	76	py_probelist = py_entry = NULL;
	77
	78	py_probelist = PyObject_GetAttrString(d->py_dec, attr);
	79	if (!PyList_Check(py_probelist)) {
	80	srd_err("Protocol decoder %s %s attribute is not "
	81	"a list.", d->name, attr);
	82	goto err_out;
	83	}
	84
	85	num_probes = PyList_Size(py_probelist);
	86	if (num_probes == 0)
	87	/* Empty probelist. */
	88	return SRD_OK;
	89
	90	for (i = 0; i < num_probes; i++) {
	91	py_entry = PyList_GetItem(py_probelist, i);
	92	if (!PyDict_Check(py_entry)) {
	93	srd_err("Protocol decoder %s %s attribute is not "
	94	"a list with dict elements.", d->name, attr);
	95	goto err_out;
	96	}
	97
	98	if (!(p = g_try_malloc(sizeof(struct srd_probe)))) {
	99	srd_err("Failed to g_malloc() struct srd_probe.");
	100	ret = SRD_ERR_MALLOC;
	101	goto err_out;
	102	}
	103
	104	if ((py_dictitem_as_str(py_entry, "id", &p->id)) != SRD_OK)
	105	goto err_out;
	106	if ((py_dictitem_as_str(py_entry, "name", &p->name)) != SRD_OK)
	107	goto err_out;
	108	if ((py_dictitem_as_str(py_entry, "desc", &p->desc)) != SRD_OK)
	109	goto err_out;
	110	p->order = i;
	111
	112	pl = g_slist_append(pl, p);
	113	}
	114	ret = SRD_OK;
	115
	116	err_out:
	117	Py_DecRef(py_entry);
	118	Py_DecRef(py_probelist);
	119
	120	return ret;
	121	}
	122
	123	/**
	124	* Load a protocol decoder module into the embedded Python interpreter.
	125	*
	126	* @param name The module name to be loaded.
	127	*
	128	* @return SRD_OK upon success, a (negative) error code otherwise.
	129	*/
	130	SRD_API int srd_decoder_load(const char *module_name)
	131	{
	132	PyObject py_basedec, py_method, py_attr, py_annlist, *py_ann;
	133	struct srd_decoder *d;
	134	int alen, ret, i;
	135	char **ann;
	136
	137	srd_dbg("Loading module '%s'.", module_name);
	138
	139	py_basedec = py_method = py_attr = NULL;
	140
	141	if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
	142	srd_dbg("Failed to g_malloc() struct srd_decoder.");
	143	ret = SRD_ERR_MALLOC;
	144	goto err_out;
	145	}
	146
	147	ret = SRD_ERR_PYTHON;
	148
	149	/* Import the Python module. */
	150	if (!(d->py_mod = PyImport_ImportModule(module_name))) {
	151	catch_exception("import of '%s' failed.", module_name);
	152	goto err_out;
	153	}
	154
	155	/* Get the 'Decoder' class as Python object. */
	156	if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) {
	157	/* This generated an AttributeError exception. */
	158	PyErr_Clear();
	159	srd_err("Decoder class not found in protocol decoder %s.", module_name);
	160	goto err_out;
	161	}
	162
	163	if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) {
	164	srd_dbg("sigrokdecode module not loaded.");
	165	goto err_out;
	166	}
	167
	168	if (!PyObject_IsSubclass(d->py_dec, py_basedec)) {
	169	srd_err("Decoder class in protocol decoder module %s is not "
	170	"a subclass of sigrokdecode.Decoder.", module_name);
	171	goto err_out;
	172	}
	173	Py_CLEAR(py_basedec);
	174
	175	/* Check for a proper start() method. */
	176	if (!PyObject_HasAttrString(d->py_dec, "start")) {
	177	srd_err("Protocol decoder %s has no start() method Decoder "
	178	"class.", module_name);
	179	goto err_out;
	180	}
	181	py_method = PyObject_GetAttrString(d->py_dec, "start");
	182	if (!PyFunction_Check(py_method)) {
	183	srd_err("Protocol decoder %s Decoder class attribute 'start' "
	184	"is not a method.", module_name);
	185	goto err_out;
	186	}
	187	Py_CLEAR(py_method);
	188
	189	/* Check for a proper decode() method. */
	190	if (!PyObject_HasAttrString(d->py_dec, "decode")) {
	191	srd_err("Protocol decoder %s has no decode() method Decoder "
	192	"class.", module_name);
	193	goto err_out;
	194	}
	195	py_method = PyObject_GetAttrString(d->py_dec, "decode");
	196	if (!PyFunction_Check(py_method)) {
	197	srd_err("Protocol decoder %s Decoder class attribute 'decode' "
	198	"is not a method.", module_name);
	199	goto err_out;
	200	}
	201	Py_CLEAR(py_method);
	202
	203	/* If present, options must be a dictionary. */
	204	if (PyObject_HasAttrString(d->py_dec, "options")) {
	205	py_attr = PyObject_GetAttrString(d->py_dec, "options");
	206	if (!PyDict_Check(py_attr)) {
	207	srd_err("Protocol decoder %s options attribute is not "
	208	"a dictionary.", d->name);
	209	Py_DecRef(py_attr);
	210	goto err_out;
	211	}
	212	Py_DecRef(py_attr);
	213	}
	214
	215	/* Check and import required probes. */
	216	if (get_probes(d, "probes", &d->probes) != SRD_OK)
	217	goto err_out;
	218
	219	/* Check and import optional probes. */
	220	if (get_probes(d, "optional_probes", &d->opt_probes) != SRD_OK)
	221	goto err_out;
	222
	223	/* Store required fields in newly allocated strings. */
	224	if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK)
	225	goto err_out;
	226
	227	if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK)
	228	goto err_out;
	229
	230	if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK)
	231	goto err_out;
	232
	233	if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK)
	234	goto err_out;
	235
	236	if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK)
	237	goto err_out;
	238
	239	/* TODO: Handle inputformats, outputformats. */
	240	d->inputformats = NULL;
	241	d->outputformats = NULL;
	242
	243	/* Convert class annotation attribute to GSList of *char /
	244	d->annotations = NULL;
	245	if (PyObject_HasAttrString(d->py_dec, "annotations")) {
	246	py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
	247	if (!PyList_Check(py_annlist)) {
	248	srd_err("Protocol decoder module %s annotations "
	249	"should be a list.", module_name);
	250	goto err_out;
	251	}
	252	alen = PyList_Size(py_annlist);
	253	for (i = 0; i < alen; i++) {
	254	py_ann = PyList_GetItem(py_annlist, i);
	255	if (!PyList_Check(py_ann) \|\| PyList_Size(py_ann) != 2) {
	256	srd_err("Protocol decoder module %s "
	257	"annotation %d should be a list with "
	258	"two elements.", module_name, i + 1);
	259	goto err_out;
	260	}
	261
	262	if (py_strlist_to_char(py_ann, &ann) != SRD_OK) {
	263	goto err_out;
	264	}
	265	d->annotations = g_slist_append(d->annotations, ann);
	266	}
	267	}
	268
	269	/* Append it to the list of supported/loaded decoders. */
	270	pd_list = g_slist_append(pd_list, d);
	271
	272	ret = SRD_OK;
	273
	274	err_out:
	275	if (ret != SRD_OK) {
	276	Py_XDECREF(py_method);
	277	Py_XDECREF(py_basedec);
	278	Py_XDECREF(d->py_dec);
	279	Py_XDECREF(d->py_mod);
	280	g_free(d);
	281	}
	282
	283	return ret;
	284	}
	285
	286	/**
	287	* Return a protocol decoder's docstring.
	288	*
	289	* @param dec The loaded protocol decoder.
	290	*
	291	* @return A newly allocated buffer containing the docstring. The caller should
	292	* free this after use.
	293	*/
	294	SRD_API char srd_decoder_doc(struct srd_decoder dec)
	295	{
	296	PyObject *py_str;
	297	char *doc;
	298
	299	if (!PyObject_HasAttrString(dec->py_mod, "__doc__"))
	300	return NULL;
	301
	302	if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) {
	303	catch_exception("");
	304	return NULL;
	305	}
	306
	307	doc = NULL;
	308	if (py_str != Py_None)
	309	py_str_as_str(py_str, &doc);
	310	Py_DecRef(py_str);
	311
	312	return doc;
	313	}
	314
	315	static void free_probes(GSList *probelist)
	316	{
	317	GSList *l;
	318	struct srd_probe *p;
	319
	320	if (probelist == NULL)
	321	return;
	322
	323	for (l = probelist; l; l = l->next) {
	324	p = l->data;
	325	g_free(p->id);
	326	g_free(p->name);
	327	g_free(p->desc);
	328	g_free(p);
	329	}
	330	g_slist_free(probelist);
	331
	332	}
	333
	334	/**
	335	* Unload decoder module.
	336	*
	337	* @param dec The struct srd_decoder to be unloaded.
	338	*
	339	* @return SRD_OK upon success, a (negative) error code otherwise.
	340	*/
	341	SRD_API int srd_decoder_unload(struct srd_decoder *dec)
	342	{
	343	srd_dbg("unloading decoder %s", dec->name);
	344
	345	/* Since any instances of this decoder need to be released as well,
	346	* but they could be anywhere in the stack, just free the entire
	347	* stack. A frontend reloading a decoder thus has to restart all
	348	* instances, and rebuild the stack. */
	349	srd_inst_free_all(NULL);
	350
	351	free_probes(dec->probes);
	352	free_probes(dec->opt_probes);
	353	g_free(dec->id);
	354	g_free(dec->name);
	355	g_free(dec->longname);
	356	g_free(dec->desc);
	357	g_free(dec->license);
	358
	359	/* TODO: Free everything in inputformats and outputformats. */
	360	if (dec->inputformats != NULL)
	361	g_slist_free(dec->inputformats);
	362	if (dec->outputformats != NULL)
	363	g_slist_free(dec->outputformats);
	364
	365	/* The module's Decoder class. */
	366	Py_XDECREF(dec->py_dec);
	367	/* The module itself. */
	368	Py_XDECREF(dec->py_mod);
	369
	370	/* TODO: (g_)free dec itself? */
	371
	372	return SRD_OK;
	373	}
	374
	375	/**
	376	* Load all installed protocol decoders.
	377	*
	378	* @return SRD_OK upon success, a (negative) error code otherwise.
	379	*/
	380	SRD_API int srd_decoders_load_all(void)
	381	{
	382	GDir *dir;
	383	GError *error;
	384	const gchar *direntry;
	385
	386	if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) {
	387	srd_err("Unable to open %s for reading.", DECODERS_DIR);
	388	return SRD_ERR_DECODERS_DIR;
	389	}
	390
	391	while ((direntry = g_dir_read_name(dir)) != NULL) {
	392	/* The directory name is the module name (e.g. "i2c"). */
	393	srd_decoder_load(direntry);
	394	}
	395	g_dir_close(dir);
	396
	397	return SRD_OK;
	398	}
	399
	400	/**
	401	* Unload all loaded protocol decoders.
	402	*
	403	* @return SRD_OK upon success, a (negative) error code otherwise.
	404	*/
	405	SRD_API int srd_decoders_unload_all(void)
	406	{
	407	GSList *l;
	408	struct srd_decoder *dec;
	409
	410	for (l = srd_decoders_list(); l; l = l->next) {
	411	dec = l->data;
	412	srd_decoder_unload(dec);
	413	}
	414
	415	return SRD_OK;
	416	}