[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>

/**
 * @file
 *
 * Listing, loading, unloading, and handling protocol decoders.
 */

/**
 * @defgroup grp_decoder Protocol decoders
 *
 * Handling protocol decoders.
 *
 * @{
 */

/** @cond PRIVATE */

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

/* module_sigrokdecode.c */
extern SRD_PRIV PyObject *mod_sigrokdecode;

/** @endcond */

/**
 * 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 const 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 = pd_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;
}

static int get_options(struct srd_decoder *d)
{
	PyObject *py_opts, *py_keys, *py_values, *py_val, *py_desc, *py_default;
	Py_ssize_t i;
	struct srd_decoder_option *o;
	gint64 def_long;
	int num_keys, overflow, ret;
	char *key, *def_str;

	ret = SRD_ERR_PYTHON;
	key = NULL;

	if (!PyObject_HasAttrString(d->py_dec, "options"))
		/* That's fine. */
		return SRD_OK;

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

	py_keys = PyDict_Keys(py_opts);
	py_values = PyDict_Values(py_opts);
	num_keys = PyList_Size(py_keys);
	for (i = 0; i < num_keys; i++) {
		py_str_as_str(PyList_GetItem(py_keys, i), &key);
		srd_dbg("option '%s'", key);
		py_val = PyList_GetItem(py_values, i);
		if (!PyList_Check(py_val) || PyList_Size(py_val) != 2) {
			srd_err("Protocol decoder %s option '%s' value must be "
					"a list with two elements.", d->name, key);
			goto err_out;
		}
		py_desc = PyList_GetItem(py_val, 0);
		if (!PyUnicode_Check(py_desc)) {
			srd_err("Protocol decoder %s option '%s' has no "
					"description.", d->name, key);
			goto err_out;
		}
		py_default = PyList_GetItem(py_val, 1);
		if (!PyUnicode_Check(py_default) && !PyLong_Check(py_default)) {
			srd_err("Protocol decoder %s option '%s' has default "
					"of unsupported type '%s'.", d->name, key,
					Py_TYPE(py_default)->tp_name);
			goto err_out;
		}
		if (!(o = g_try_malloc(sizeof(struct srd_decoder_option)))) {
			srd_err("option malloc failed");
			goto err_out;
		}
		o->id = g_strdup(key);
		py_str_as_str(py_desc, &o->desc);
		if (PyUnicode_Check(py_default)) {
			/* UTF-8 string */
			py_str_as_str(py_default, &def_str);
			o->def = g_variant_new_string(def_str);
			g_free(def_str);
		} else {
			/* Long */
			def_long = PyLong_AsLongAndOverflow(py_default, &overflow);
			if (overflow) {
				/* Value is < LONG_MIN or > LONG_MAX */
				PyErr_Clear();
				srd_err("Protocol decoder %s option '%s' has "
						"invalid default value.", d->name, key);
				goto err_out;
			}
			o->def = g_variant_new_int64(def_long);
		}
		g_variant_ref_sink(o->def);
		d->options = g_slist_append(d->options, o);
	}
	Py_DecRef(py_keys);
	Py_DecRef(py_values);

	ret = SRD_OK;

err_out:
	Py_XDECREF(py_opts);
	g_free(key);

	return ret;
}

/**
 * Load a protocol decoder module into the embedded Python interpreter.
 *
 * @param module_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;
	struct srd_probe *p;
	GSList *l;

	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))) {
		srd_exception_catch("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 (get_options(d) != SRD_OK)
		goto err_out;

	/* 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;

	/*
	 * Fix order numbers for the optional probes.
	 *
	 * Example:
	 * Required probes: r1, r2, r3. Optional: o1, o2, o3, o4.
	 * 'order' fields in the d->probes list = 0, 1, 2.
	 * 'order' fields in the d->opt_probes list = 3, 4, 5, 6.
	 */
	for (l = d->opt_probes; l; l = l->next) {
		p = l->data;
		p->order += g_slist_length(d->probes);
	}

	/* 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;

	/* 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_get(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__"))) {
		srd_exception_catch("");
		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)
{
	struct srd_decoder_option *o;
	GSList *l;

	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);

	for (l = dec->options; l; l = l->next) {
		o = l->data;
		g_free(o->id);
		g_free(o->desc);
		g_variant_unref(o->def);
		g_free(o);
	}
	g_slist_free(dec->options);

	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);

	/* 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 = pd_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	/**
	27	* @file
	28	*
	29	* Listing, loading, unloading, and handling protocol decoders.
	30	*/
	31
	32	/**
	33	* @defgroup grp_decoder Protocol decoders
	34	*
	35	* Handling protocol decoders.
	36	*
	37	* @{
	38	*/
	39
	40	/** @cond PRIVATE */
	41
	42	/* The list of protocol decoders. */
	43	SRD_PRIV GSList *pd_list = NULL;
	44
	45	/* module_sigrokdecode.c */
	46	extern SRD_PRIV PyObject *mod_sigrokdecode;
	47
	48	/** @endcond */
	49
	50	/**
	51	* Returns the list of supported/loaded protocol decoders.
	52	*
	53	* This is a GSList containing the names of the decoders as strings.
	54	*
	55	* @return List of decoders, NULL if none are supported or loaded.
	56	*/
	57	SRD_API const GSList *srd_decoder_list(void)
	58	{
	59	return pd_list;
	60	}
	61
	62	/**
	63	* Get the decoder with the specified ID.
	64	*
	65	* @param id The ID string of the decoder to return.
	66	*
	67	* @return The decoder with the specified ID, or NULL if not found.
	68	*/
	69	SRD_API struct srd_decoder srd_decoder_get_by_id(const char id)
	70	{
	71	GSList *l;
	72	struct srd_decoder *dec;
	73
	74	for (l = pd_list; l; l = l->next) {
	75	dec = l->data;
	76	if (!strcmp(dec->id, id))
	77	return dec;
	78	}
	79
	80	return NULL;
	81	}
	82
	83	static int get_probes(const struct srd_decoder d, const char attr,
	84	GSList **pl)
	85	{
	86	PyObject py_probelist, py_entry;
	87	struct srd_probe *p;
	88	int ret, num_probes, i;
	89
	90	if (!PyObject_HasAttrString(d->py_dec, attr))
	91	/* No probes of this type specified. */
	92	return SRD_OK;
	93
	94	ret = SRD_ERR_PYTHON;
	95	py_probelist = py_entry = NULL;
	96
	97	py_probelist = PyObject_GetAttrString(d->py_dec, attr);
	98	if (!PyList_Check(py_probelist)) {
	99	srd_err("Protocol decoder %s %s attribute is not "
	100	"a list.", d->name, attr);
	101	goto err_out;
	102	}
	103
	104	num_probes = PyList_Size(py_probelist);
	105	if (num_probes == 0)
	106	/* Empty probelist. */
	107	return SRD_OK;
	108
	109	for (i = 0; i < num_probes; i++) {
	110	py_entry = PyList_GetItem(py_probelist, i);
	111	if (!PyDict_Check(py_entry)) {
	112	srd_err("Protocol decoder %s %s attribute is not "
	113	"a list with dict elements.", d->name, attr);
	114	goto err_out;
	115	}
	116
	117	if (!(p = g_try_malloc(sizeof(struct srd_probe)))) {
	118	srd_err("Failed to g_malloc() struct srd_probe.");
	119	ret = SRD_ERR_MALLOC;
	120	goto err_out;
	121	}
	122
	123	if ((py_dictitem_as_str(py_entry, "id", &p->id)) != SRD_OK)
	124	goto err_out;
	125	if ((py_dictitem_as_str(py_entry, "name", &p->name)) != SRD_OK)
	126	goto err_out;
	127	if ((py_dictitem_as_str(py_entry, "desc", &p->desc)) != SRD_OK)
	128	goto err_out;
	129	p->order = i;
	130
	131	pl = g_slist_append(pl, p);
	132	}
	133	ret = SRD_OK;
	134
	135	err_out:
	136	Py_DecRef(py_entry);
	137	Py_DecRef(py_probelist);
	138
	139	return ret;
	140	}
	141
	142	static int get_options(struct srd_decoder *d)
	143	{
	144	PyObject py_opts, py_keys, py_values, py_val, py_desc, py_default;
	145	Py_ssize_t i;
	146	struct srd_decoder_option *o;
	147	gint64 def_long;
	148	int num_keys, overflow, ret;
	149	char key, def_str;
	150
	151	ret = SRD_ERR_PYTHON;
	152	key = NULL;
	153
	154	if (!PyObject_HasAttrString(d->py_dec, "options"))
	155	/* That's fine. */
	156	return SRD_OK;
	157
	158	/* If present, options must be a dictionary. */
	159	py_opts = PyObject_GetAttrString(d->py_dec, "options");
	160	if (!PyDict_Check(py_opts)) {
	161	srd_err("Protocol decoder %s options attribute is not "
	162	"a dictionary.", d->name);
	163	goto err_out;
	164	}
	165
	166	py_keys = PyDict_Keys(py_opts);
	167	py_values = PyDict_Values(py_opts);
	168	num_keys = PyList_Size(py_keys);
	169	for (i = 0; i < num_keys; i++) {
	170	py_str_as_str(PyList_GetItem(py_keys, i), &key);
	171	srd_dbg("option '%s'", key);
	172	py_val = PyList_GetItem(py_values, i);
	173	if (!PyList_Check(py_val) \|\| PyList_Size(py_val) != 2) {
	174	srd_err("Protocol decoder %s option '%s' value must be "
	175	"a list with two elements.", d->name, key);
	176	goto err_out;
	177	}
	178	py_desc = PyList_GetItem(py_val, 0);
	179	if (!PyUnicode_Check(py_desc)) {
	180	srd_err("Protocol decoder %s option '%s' has no "
	181	"description.", d->name, key);
	182	goto err_out;
	183	}
	184	py_default = PyList_GetItem(py_val, 1);
	185	if (!PyUnicode_Check(py_default) && !PyLong_Check(py_default)) {
	186	srd_err("Protocol decoder %s option '%s' has default "
	187	"of unsupported type '%s'.", d->name, key,
	188	Py_TYPE(py_default)->tp_name);
	189	goto err_out;
	190	}
	191	if (!(o = g_try_malloc(sizeof(struct srd_decoder_option)))) {
	192	srd_err("option malloc failed");
	193	goto err_out;
	194	}
	195	o->id = g_strdup(key);
	196	py_str_as_str(py_desc, &o->desc);
	197	if (PyUnicode_Check(py_default)) {
	198	/* UTF-8 string */
	199	py_str_as_str(py_default, &def_str);
	200	o->def = g_variant_new_string(def_str);
	201	g_free(def_str);
	202	} else {
	203	/* Long */
	204	def_long = PyLong_AsLongAndOverflow(py_default, &overflow);
	205	if (overflow) {
	206	/* Value is < LONG_MIN or > LONG_MAX */
	207	PyErr_Clear();
	208	srd_err("Protocol decoder %s option '%s' has "
	209	"invalid default value.", d->name, key);
	210	goto err_out;
	211	}
	212	o->def = g_variant_new_int64(def_long);
	213	}
	214	g_variant_ref_sink(o->def);
	215	d->options = g_slist_append(d->options, o);
	216	}
	217	Py_DecRef(py_keys);
	218	Py_DecRef(py_values);
	219
	220	ret = SRD_OK;
	221
	222	err_out:
	223	Py_XDECREF(py_opts);
	224	g_free(key);
	225
	226	return ret;
	227	}
	228
	229	/**
	230	* Load a protocol decoder module into the embedded Python interpreter.
	231	*
	232	* @param module_name The module name to be loaded.
	233	*
	234	* @return SRD_OK upon success, a (negative) error code otherwise.
	235	*/
	236	SRD_API int srd_decoder_load(const char *module_name)
	237	{
	238	PyObject py_basedec, py_method, py_attr, py_annlist, *py_ann;
	239	struct srd_decoder *d;
	240	int alen, ret, i;
	241	char **ann;
	242	struct srd_probe *p;
	243	GSList *l;
	244
	245	srd_dbg("Loading protocol decoder '%s'.", module_name);
	246
	247	py_basedec = py_method = py_attr = NULL;
	248
	249	if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
	250	srd_dbg("Failed to g_malloc() struct srd_decoder.");
	251	ret = SRD_ERR_MALLOC;
	252	goto err_out;
	253	}
	254
	255	ret = SRD_ERR_PYTHON;
	256
	257	/* Import the Python module. */
	258	if (!(d->py_mod = PyImport_ImportModule(module_name))) {
	259	srd_exception_catch("Import of '%s' failed.", module_name);
	260	goto err_out;
	261	}
	262
	263	/* Get the 'Decoder' class as Python object. */
	264	if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) {
	265	/* This generated an AttributeError exception. */
	266	PyErr_Clear();
	267	srd_err("Decoder class not found in protocol decoder %s.",
	268	module_name);
	269	goto err_out;
	270	}
	271
	272	if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) {
	273	srd_dbg("sigrokdecode module not loaded.");
	274	goto err_out;
	275	}
	276
	277	if (!PyObject_IsSubclass(d->py_dec, py_basedec)) {
	278	srd_err("Decoder class in protocol decoder module %s is not "
	279	"a subclass of sigrokdecode.Decoder.", module_name);
	280	goto err_out;
	281	}
	282	Py_CLEAR(py_basedec);
	283
	284	/* Check for a proper start() method. */
	285	if (!PyObject_HasAttrString(d->py_dec, "start")) {
	286	srd_err("Protocol decoder %s has no start() method Decoder "
	287	"class.", module_name);
	288	goto err_out;
	289	}
	290	py_method = PyObject_GetAttrString(d->py_dec, "start");
	291	if (!PyFunction_Check(py_method)) {
	292	srd_err("Protocol decoder %s Decoder class attribute 'start' "
	293	"is not a method.", module_name);
	294	goto err_out;
	295	}
	296	Py_CLEAR(py_method);
	297
	298	/* Check for a proper decode() method. */
	299	if (!PyObject_HasAttrString(d->py_dec, "decode")) {
	300	srd_err("Protocol decoder %s has no decode() method Decoder "
	301	"class.", module_name);
	302	goto err_out;
	303	}
	304	py_method = PyObject_GetAttrString(d->py_dec, "decode");
	305	if (!PyFunction_Check(py_method)) {
	306	srd_err("Protocol decoder %s Decoder class attribute 'decode' "
	307	"is not a method.", module_name);
	308	goto err_out;
	309	}
	310	Py_CLEAR(py_method);
	311
	312	if (get_options(d) != SRD_OK)
	313	goto err_out;
	314
	315	/* Check and import required probes. */
	316	if (get_probes(d, "probes", &d->probes) != SRD_OK)
	317	goto err_out;
	318
	319	/* Check and import optional probes. */
	320	if (get_probes(d, "optional_probes", &d->opt_probes) != SRD_OK)
	321	goto err_out;
	322
	323	/*
	324	* Fix order numbers for the optional probes.
	325	*
	326	* Example:
	327	* Required probes: r1, r2, r3. Optional: o1, o2, o3, o4.
	328	* 'order' fields in the d->probes list = 0, 1, 2.
	329	* 'order' fields in the d->opt_probes list = 3, 4, 5, 6.
	330	*/
	331	for (l = d->opt_probes; l; l = l->next) {
	332	p = l->data;
	333	p->order += g_slist_length(d->probes);
	334	}
	335
	336	/* Store required fields in newly allocated strings. */
	337	if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK)
	338	goto err_out;
	339
	340	if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK)
	341	goto err_out;
	342
	343	if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK)
	344	goto err_out;
	345
	346	if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK)
	347	goto err_out;
	348
	349	if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK)
	350	goto err_out;
	351
	352	/* Convert class annotation attribute to GSList of *char. /
	353	d->annotations = NULL;
	354	if (PyObject_HasAttrString(d->py_dec, "annotations")) {
	355	py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
	356	if (!PyList_Check(py_annlist)) {
	357	srd_err("Protocol decoder module %s annotations "
	358	"should be a list.", module_name);
	359	goto err_out;
	360	}
	361	alen = PyList_Size(py_annlist);
	362	for (i = 0; i < alen; i++) {
	363	py_ann = PyList_GetItem(py_annlist, i);
	364	if (!PyList_Check(py_ann) \|\| PyList_Size(py_ann) != 2) {
	365	srd_err("Protocol decoder module %s "
	366	"annotation %d should be a list with "
	367	"two elements.", module_name, i + 1);
	368	goto err_out;
	369	}
	370
	371	if (py_strlist_to_char(py_ann, &ann) != SRD_OK) {
	372	goto err_out;
	373	}
	374	d->annotations = g_slist_append(d->annotations, ann);
	375	}
	376	}
	377
	378	/* Append it to the list of supported/loaded decoders. */
	379	pd_list = g_slist_append(pd_list, d);
	380
	381	ret = SRD_OK;
	382
	383	err_out:
	384	if (ret != SRD_OK) {
	385	Py_XDECREF(py_method);
	386	Py_XDECREF(py_basedec);
	387	Py_XDECREF(d->py_dec);
	388	Py_XDECREF(d->py_mod);
	389	g_free(d);
	390	}
	391
	392	return ret;
	393	}
	394
	395	/**
	396	* Return a protocol decoder's docstring.
	397	*
	398	* @param dec The loaded protocol decoder.
	399	*
	400	* @return A newly allocated buffer containing the protocol decoder's
	401	* documentation. The caller is responsible for free'ing the buffer.
	402	*/
	403	SRD_API char srd_decoder_doc_get(const struct srd_decoder dec)
	404	{
	405	PyObject *py_str;
	406	char *doc;
	407
	408	if (!PyObject_HasAttrString(dec->py_mod, "__doc__"))
	409	return NULL;
	410
	411	if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) {
	412	srd_exception_catch("");
	413	return NULL;
	414	}
	415
	416	doc = NULL;
	417	if (py_str != Py_None)
	418	py_str_as_str(py_str, &doc);
	419	Py_DecRef(py_str);
	420
	421	return doc;
	422	}
	423
	424	static void free_probes(GSList *probelist)
	425	{
	426	GSList *l;
	427	struct srd_probe *p;
	428
	429	if (probelist == NULL)
	430	return;
	431
	432	for (l = probelist; l; l = l->next) {
	433	p = l->data;
	434	g_free(p->id);
	435	g_free(p->name);
	436	g_free(p->desc);
	437	g_free(p);
	438	}
	439	g_slist_free(probelist);
	440	}
	441
	442	/**
	443	* Unload decoder module.
	444	*
	445	* @param dec The struct srd_decoder to be unloaded.
	446	*
	447	* @return SRD_OK upon success, a (negative) error code otherwise.
	448	*/
	449	SRD_API int srd_decoder_unload(struct srd_decoder *dec)
	450	{
	451	struct srd_decoder_option *o;
	452	GSList *l;
	453
	454	srd_dbg("Unloading protocol decoder '%s'.", dec->name);
	455
	456	/*
	457	* Since any instances of this decoder need to be released as well,
	458	* but they could be anywhere in the stack, just free the entire
	459	* stack. A frontend reloading a decoder thus has to restart all
	460	* instances, and rebuild the stack.
	461	*/
	462	srd_inst_free_all(NULL);
	463
	464	for (l = dec->options; l; l = l->next) {
	465	o = l->data;
	466	g_free(o->id);
	467	g_free(o->desc);
	468	g_variant_unref(o->def);
	469	g_free(o);
	470	}
	471	g_slist_free(dec->options);
	472
	473	free_probes(dec->probes);
	474	free_probes(dec->opt_probes);
	475	g_free(dec->id);
	476	g_free(dec->name);
	477	g_free(dec->longname);
	478	g_free(dec->desc);
	479	g_free(dec->license);
	480
	481	/* The module's Decoder class. */
	482	Py_XDECREF(dec->py_dec);
	483	/* The module itself. */
	484	Py_XDECREF(dec->py_mod);
	485
	486	/* TODO: (g_)free dec itself? */
	487
	488	return SRD_OK;
	489	}
	490
	491	/**
	492	* Load all installed protocol decoders.
	493	*
	494	* @return SRD_OK upon success, a (negative) error code otherwise.
	495	*/
	496	SRD_API int srd_decoder_load_all(void)
	497	{
	498	GDir *dir;
	499	GError *error;
	500	const gchar *direntry;
	501
	502	if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) {
	503	srd_err("Unable to open %s for reading.", DECODERS_DIR);
	504	return SRD_ERR_DECODERS_DIR;
	505	}
	506
	507	while ((direntry = g_dir_read_name(dir)) != NULL) {
	508	/* The directory name is the module name (e.g. "i2c"). */
	509	srd_decoder_load(direntry);
	510	}
	511	g_dir_close(dir);
	512
	513	return SRD_OK;
	514	}
	515
	516	/**
	517	* Unload all loaded protocol decoders.
	518	*
	519	* @return SRD_OK upon success, a (negative) error code otherwise.
	520	*/
	521	SRD_API int srd_decoder_unload_all(void)
	522	{
	523	GSList *l;
	524	struct srd_decoder *dec;
	525
	526	for (l = pd_list; l; l = l->next) {
	527	dec = l->data;
	528	srd_decoder_unload(dec);
	529	}
	530
	531	return SRD_OK;
	532	}
	533
	534	/** @} */