[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_decoder_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_decoder_list(); l; l = l->next) {
		dec = l->data;
		if (!strcmp(dec->id, id))
			return dec;
	}

	return NULL;
}

static int get_probes(const struct srd_decoder *d, const 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 protocol decoder '%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 protocol decoder's
 *         documentation. The caller is responsible for free'ing the buffer.
 */
SRD_API char *srd_decoder_doc(const 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 protocol 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_decoder_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_decoder_unload_all(void)
{
	GSList *l;
	struct srd_decoder *dec;

	for (l = srd_decoder_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_decoder_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_decoder_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(const struct srd_decoder d, const char attr,
	66	GSList **pl)
	67	{
	68	PyObject py_probelist, py_entry;
	69	struct srd_probe *p;
	70	int ret, num_probes, i;
	71
	72	if (!PyObject_HasAttrString(d->py_dec, attr))
	73	/* No probes of this type specified. */
	74	return SRD_OK;
	75
	76	ret = SRD_ERR_PYTHON;
	77	py_probelist = py_entry = NULL;
	78
	79	py_probelist = PyObject_GetAttrString(d->py_dec, attr);
	80	if (!PyList_Check(py_probelist)) {
	81	srd_err("Protocol decoder %s %s attribute is not "
	82	"a list.", d->name, attr);
	83	goto err_out;
	84	}
	85
	86	num_probes = PyList_Size(py_probelist);
	87	if (num_probes == 0)
	88	/* Empty probelist. */
	89	return SRD_OK;
	90
	91	for (i = 0; i < num_probes; i++) {
	92	py_entry = PyList_GetItem(py_probelist, i);
	93	if (!PyDict_Check(py_entry)) {
	94	srd_err("Protocol decoder %s %s attribute is not "
	95	"a list with dict elements.", d->name, attr);
	96	goto err_out;
	97	}
	98
	99	if (!(p = g_try_malloc(sizeof(struct srd_probe)))) {
	100	srd_err("Failed to g_malloc() struct srd_probe.");
	101	ret = SRD_ERR_MALLOC;
	102	goto err_out;
	103	}
	104
	105	if ((py_dictitem_as_str(py_entry, "id", &p->id)) != SRD_OK)
	106	goto err_out;
	107	if ((py_dictitem_as_str(py_entry, "name", &p->name)) != SRD_OK)
	108	goto err_out;
	109	if ((py_dictitem_as_str(py_entry, "desc", &p->desc)) != SRD_OK)
	110	goto err_out;
	111	p->order = i;
	112
	113	pl = g_slist_append(pl, p);
	114	}
	115	ret = SRD_OK;
	116
	117	err_out:
	118	Py_DecRef(py_entry);
	119	Py_DecRef(py_probelist);
	120
	121	return ret;
	122	}
	123
	124	/**
	125	* Load a protocol decoder module into the embedded Python interpreter.
	126	*
	127	* @param name The module name to be loaded.
	128	*
	129	* @return SRD_OK upon success, a (negative) error code otherwise.
	130	*/
	131	SRD_API int srd_decoder_load(const char *module_name)
	132	{
	133	PyObject py_basedec, py_method, py_attr, py_annlist, *py_ann;
	134	struct srd_decoder *d;
	135	int alen, ret, i;
	136	char **ann;
	137
	138	srd_dbg("Loading protocol decoder '%s'.", module_name);
	139
	140	py_basedec = py_method = py_attr = NULL;
	141
	142	if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
	143	srd_dbg("Failed to g_malloc() struct srd_decoder.");
	144	ret = SRD_ERR_MALLOC;
	145	goto err_out;
	146	}
	147
	148	ret = SRD_ERR_PYTHON;
	149
	150	/* Import the Python module. */
	151	if (!(d->py_mod = PyImport_ImportModule(module_name))) {
	152	catch_exception("Import of '%s' failed.", module_name);
	153	goto err_out;
	154	}
	155
	156	/* Get the 'Decoder' class as Python object. */
	157	if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) {
	158	/* This generated an AttributeError exception. */
	159	PyErr_Clear();
	160	srd_err("Decoder class not found in protocol decoder %s.",
	161	module_name);
	162	goto err_out;
	163	}
	164
	165	if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) {
	166	srd_dbg("sigrokdecode module not loaded.");
	167	goto err_out;
	168	}
	169
	170	if (!PyObject_IsSubclass(d->py_dec, py_basedec)) {
	171	srd_err("Decoder class in protocol decoder module %s is not "
	172	"a subclass of sigrokdecode.Decoder.", module_name);
	173	goto err_out;
	174	}
	175	Py_CLEAR(py_basedec);
	176
	177	/* Check for a proper start() method. */
	178	if (!PyObject_HasAttrString(d->py_dec, "start")) {
	179	srd_err("Protocol decoder %s has no start() method Decoder "
	180	"class.", module_name);
	181	goto err_out;
	182	}
	183	py_method = PyObject_GetAttrString(d->py_dec, "start");
	184	if (!PyFunction_Check(py_method)) {
	185	srd_err("Protocol decoder %s Decoder class attribute 'start' "
	186	"is not a method.", module_name);
	187	goto err_out;
	188	}
	189	Py_CLEAR(py_method);
	190
	191	/* Check for a proper decode() method. */
	192	if (!PyObject_HasAttrString(d->py_dec, "decode")) {
	193	srd_err("Protocol decoder %s has no decode() method Decoder "
	194	"class.", module_name);
	195	goto err_out;
	196	}
	197	py_method = PyObject_GetAttrString(d->py_dec, "decode");
	198	if (!PyFunction_Check(py_method)) {
	199	srd_err("Protocol decoder %s Decoder class attribute 'decode' "
	200	"is not a method.", module_name);
	201	goto err_out;
	202	}
	203	Py_CLEAR(py_method);
	204
	205	/* If present, options must be a dictionary. */
	206	if (PyObject_HasAttrString(d->py_dec, "options")) {
	207	py_attr = PyObject_GetAttrString(d->py_dec, "options");
	208	if (!PyDict_Check(py_attr)) {
	209	srd_err("Protocol decoder %s options attribute is not "
	210	"a dictionary.", d->name);
	211	Py_DecRef(py_attr);
	212	goto err_out;
	213	}
	214	Py_DecRef(py_attr);
	215	}
	216
	217	/* Check and import required probes. */
	218	if (get_probes(d, "probes", &d->probes) != SRD_OK)
	219	goto err_out;
	220
	221	/* Check and import optional probes. */
	222	if (get_probes(d, "optional_probes", &d->opt_probes) != SRD_OK)
	223	goto err_out;
	224
	225	/* Store required fields in newly allocated strings. */
	226	if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK)
	227	goto err_out;
	228
	229	if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK)
	230	goto err_out;
	231
	232	if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK)
	233	goto err_out;
	234
	235	if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK)
	236	goto err_out;
	237
	238	if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK)
	239	goto err_out;
	240
	241	/* TODO: Handle inputformats, outputformats. */
	242	d->inputformats = NULL;
	243	d->outputformats = NULL;
	244
	245	/* Convert class annotation attribute to GSList of *char. /
	246	d->annotations = NULL;
	247	if (PyObject_HasAttrString(d->py_dec, "annotations")) {
	248	py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
	249	if (!PyList_Check(py_annlist)) {
	250	srd_err("Protocol decoder module %s annotations "
	251	"should be a list.", module_name);
	252	goto err_out;
	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) {
	258	srd_err("Protocol decoder module %s "
	259	"annotation %d should be a list with "
	260	"two elements.", module_name, i + 1);
	261	goto err_out;
	262	}
	263
	264	if (py_strlist_to_char(py_ann, &ann) != SRD_OK) {
	265	goto err_out;
	266	}
	267	d->annotations = g_slist_append(d->annotations, ann);
	268	}
	269	}
	270
	271	/* Append it to the list of supported/loaded decoders. */
	272	pd_list = g_slist_append(pd_list, d);
	273
	274	ret = SRD_OK;
	275
	276	err_out:
	277	if (ret != SRD_OK) {
	278	Py_XDECREF(py_method);
	279	Py_XDECREF(py_basedec);
	280	Py_XDECREF(d->py_dec);
	281	Py_XDECREF(d->py_mod);
	282	g_free(d);
	283	}
	284
	285	return ret;
	286	}
	287
	288	/**
	289	* Return a protocol decoder's docstring.
	290	*
	291	* @param dec The loaded protocol decoder.
	292	*
	293	* @return A newly allocated buffer containing the protocol decoder's
	294	* documentation. The caller is responsible for free'ing the buffer.
	295	*/
	296	SRD_API char srd_decoder_doc(const struct srd_decoder dec)
	297	{
	298	PyObject *py_str;
	299	char *doc;
	300
	301	if (!PyObject_HasAttrString(dec->py_mod, "__doc__"))
	302	return NULL;
	303
	304	if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) {
	305	catch_exception("");
	306	return NULL;
	307	}
	308
	309	doc = NULL;
	310	if (py_str != Py_None)
	311	py_str_as_str(py_str, &doc);
	312	Py_DecRef(py_str);
	313
	314	return doc;
	315	}
	316
	317	static void free_probes(GSList *probelist)
	318	{
	319	GSList *l;
	320	struct srd_probe *p;
	321
	322	if (probelist == NULL)
	323	return;
	324
	325	for (l = probelist; l; l = l->next) {
	326	p = l->data;
	327	g_free(p->id);
	328	g_free(p->name);
	329	g_free(p->desc);
	330	g_free(p);
	331	}
	332	g_slist_free(probelist);
	333	}
	334
	335	/**
	336	* Unload decoder module.
	337	*
	338	* @param dec The struct srd_decoder to be unloaded.
	339	*
	340	* @return SRD_OK upon success, a (negative) error code otherwise.
	341	*/
	342	SRD_API int srd_decoder_unload(struct srd_decoder *dec)
	343	{
	344	srd_dbg("Unloading protocol decoder '%s'.", dec->name);
	345
	346	/*
	347	* Since any instances of this decoder need to be released as well,
	348	* but they could be anywhere in the stack, just free the entire
	349	* stack. A frontend reloading a decoder thus has to restart all
	350	* instances, and rebuild the stack.
	351	*/
	352	srd_inst_free_all(NULL);
	353
	354	free_probes(dec->probes);
	355	free_probes(dec->opt_probes);
	356	g_free(dec->id);
	357	g_free(dec->name);
	358	g_free(dec->longname);
	359	g_free(dec->desc);
	360	g_free(dec->license);
	361
	362	/* TODO: Free everything in inputformats and outputformats. */
	363	if (dec->inputformats != NULL)
	364	g_slist_free(dec->inputformats);
	365	if (dec->outputformats != NULL)
	366	g_slist_free(dec->outputformats);
	367
	368	/* The module's Decoder class. */
	369	Py_XDECREF(dec->py_dec);
	370	/* The module itself. */
	371	Py_XDECREF(dec->py_mod);
	372
	373	/* TODO: (g_)free dec itself? */
	374
	375	return SRD_OK;
	376	}
	377
	378	/**
	379	* Load all installed protocol decoders.
	380	*
	381	* @return SRD_OK upon success, a (negative) error code otherwise.
	382	*/
	383	SRD_API int srd_decoder_load_all(void)
	384	{
	385	GDir *dir;
	386	GError *error;
	387	const gchar *direntry;
	388
	389	if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) {
	390	srd_err("Unable to open %s for reading.", DECODERS_DIR);
	391	return SRD_ERR_DECODERS_DIR;
	392	}
	393
	394	while ((direntry = g_dir_read_name(dir)) != NULL) {
	395	/* The directory name is the module name (e.g. "i2c"). */
	396	srd_decoder_load(direntry);
	397	}
	398	g_dir_close(dir);
	399
	400	return SRD_OK;
	401	}
	402
	403	/**
	404	* Unload all loaded protocol decoders.
	405	*
	406	* @return SRD_OK upon success, a (negative) error code otherwise.
	407	*/
	408	SRD_API int srd_decoder_unload_all(void)
	409	{
	410	GSList *l;
	411	struct srd_decoder *dec;
	412
	413	for (l = srd_decoder_list(); l; l = l->next) {
	414	dec = l->data;
	415	srd_decoder_unload(dec);
	416	}
	417
	418	return SRD_OK;
	419	}