[libsigrokdecode.git] / decoder.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2011 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 <glib.h>
#include "config.h"
#include "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include "sigrokdecode-internal.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;
}


/**
 * 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_annlist, *py_ann;
	struct srd_decoder *d;
	int alen, ret, i;
	char **ann;

	py_basedec = NULL;
	ret = SRD_ERR;

	srd_dbg("decoder: %s: loading module '%s'", __func__, name);

	if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
		srd_err("decoder: %s: d malloc failed", __func__);
		ret = SRD_ERR_MALLOC;
		goto err_out;
	}

	/* Import the Python module. */
	if (!(d->py_mod = PyImport_ImportModule(name))) {
		/* TODO: Report exception message/traceback to err/dbg. */
		srd_warn("decoder: %s: import of '%s' failed", __func__, name);
		PyErr_Print();
		PyErr_Clear();
		ret = SRD_ERR_PYTHON;
		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_Print();
		PyErr_Clear();
		srd_err("Decoder class not found in protocol decoder module %s", name);
		ret = SRD_ERR_PYTHON;
		goto err_out;
	}

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

	if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK) {
		return SRD_ERR_PYTHON;
		goto err_out;
	}

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

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

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

	if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK) {
		return SRD_ERR_PYTHON;
		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);
			ret = SRD_ERR_PYTHON;
			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);
				ret = SRD_ERR_PYTHON;
				goto err_out;
			}

			if (py_strlist_to_char(py_ann, &ann) != SRD_OK) {
				ret = SRD_ERR_PYTHON;
				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_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__"))) {
		PyErr_Clear();
		return NULL;
	}

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

	return doc;
}


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

	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);

	Py_XDECREF(dec->py_dec);
	Py_XDECREF(dec->py_mod);

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

	return SRD_OK;
}

/**
 * Check if the directory in the specified search path is a valid PD dir.
 *
 * A valid sigrok protocol decoder consists of a directory, which contains
 * at least two .py files (the special __init__.py and at least one additional
 * .py file which contains the actual PD code).
 *
 * TODO: We should also check that this is not a random other Python module,
 * but really a sigrok PD module by some means.
 *
 * @param search_path A string containing the (absolute) path to the directory
 *                    where 'entry' resides in.
 * @param entry A string containing the (relative) directory name of the
 *              sigrok PD module. E.g. "i2c" for the I2C protocol decoder.
 * @return SRD_OK, if the directory is a valid sigrok PD, a negative error
 *         code, such as SRD_ERR, otherwise.
 */
int srd_is_valid_pd_dir(const gchar *search_path, const gchar *entry)
{
	GDir *dir;
	int py_files = 0, has_init_py = 0;
	gchar *path1, *path2, *file;
	GError *error;

	/* TODO: Error handling. */
	path1 = g_build_filename(search_path, entry, NULL);

	/* Check that it is a directory (and exists). */
	if (!g_file_test(path1, G_FILE_TEST_IS_DIR)) {
		srd_dbg("decoder: %s: '%s' not a directory or doesn't exist",
			__func__, entry);
		return SRD_ERR;
	}

	if (!(dir = g_dir_open(path1, 0, &error))) { /* TODO: flags? */
		srd_dbg("decoder: %s: '%s' failed to open directory",
			__func__, entry);
		return SRD_ERR;
	}

	/* Check the contents of the directory. */
	while ((file = g_dir_read_name(dir)) != NULL) {
		/* TODO: Error handling. */
		path2 = g_build_filename(path1, file, NULL);

		/* Ignore non-files. */
		if (!g_file_test(path2, G_FILE_TEST_IS_REGULAR)) {
			srd_spew("decoder: %s: '%s' not a file, ignoring",
				 __func__, file);
			continue;
		}

		/* Count number of .py files. */
		if (g_str_has_suffix(path2, ".py")) {
			srd_spew("decoder: %s: found .py file: '%s'",
				 __func__, file);
			py_files++;
		}

		/* Check if it's an __init__.py file. */
		if (g_str_has_suffix(path2, "__init__.py")) {
			srd_spew("decoder: %s: found __init__.py file: '%s'",
				 __func__, path2);
			has_init_py = 1;
		}
	}
	g_dir_close(dir);

	/* Check if the directory contains >= 2 *.py files. */
	if (py_files < 2) {
		srd_dbg("decoder: %s: '%s' is not a valid PD dir, it doesn't "
			"contain >= 2 .py files", __func__, entry);
		return SRD_ERR;
	}

	/* Check if the directory contains an __init__.py file. */
	if (!has_init_py) {
		srd_dbg("decoder: %s: '%s' is not a valid PD dir, it doesn't "
			"contain an __init__.py file", __func__, entry);
		return SRD_ERR;
	}

	/* TODO: Check if it's a PD, not a random other Python module. */

	return SRD_OK;
}

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

	if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) { /* TODO: flags? */
		Py_Finalize(); /* Returns void. */
		return SRD_ERR_DECODERS_DIR;
	}

	while ((direntry = g_dir_read_name(dir)) != NULL) {
		/* Ignore directory entries which are not valid PDs. */
		if (srd_is_valid_pd_dir(DECODERS_DIR, direntry) != SRD_OK) {
			srd_dbg("decoder: %s: '%s' not a valid PD dir, "
				"ignoring it", __func__, direntry);
			continue;
		}

		/* The decoder name is the PD directory name (e.g. "i2c"). */
		decodername = g_strdup(direntry);

		/* TODO: Error handling. Use g_try_malloc(). */
		if (!(dec = malloc(sizeof(struct srd_decoder)))) {
			Py_Finalize(); /* Returns void. */
			return SRD_ERR_MALLOC;
		}

		/* Load the decoder. */
		/* TODO: Warning if loading fails for a decoder. */
		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;
		/* TODO: Error handling. */
		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>
	5	* Copyright (C) 2011 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
64c29e28	21	#include <glib.h>
b2c19614	22	#include "config.h"
73191416	23	#include "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
15969949	24	#include "sigrokdecode-internal.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
	68	/**
64c29e28	69	* Load a protocol decoder module into the embedded Python interpreter.
b2c19614	70	*
15969949 BV	71	* @param name The module name to be loaded.
15969949 BV	72	* @param dec Pointer to the struct srd_decoder filled with the loaded module.
b2c19614 BV	73	*
	74	* @return SRD_OK upon success, a (negative) error code otherwise.
	75	*/
	76	int srd_load_decoder(const char name, struct srd_decoder *dec)
	77	{
451680f1	78	PyObject py_basedec, py_annlist, *py_ann;
b2c19614	79	struct srd_decoder *d;
451680f1	80	int alen, ret, i;
15969949	81	char **ann;
b2c19614	82
451680f1 BV	83	py_basedec = NULL;
451680f1 BV	84	ret = SRD_ERR;
64c29e28 UH	85
64c29e28 UH	86	srd_dbg("decoder: %s: loading module '%s'", __func__, name);
b2c19614	87
451680f1	88	if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
64c29e28	89	srd_err("decoder: %s: d malloc failed", __func__);
451680f1 BV	90	ret = SRD_ERR_MALLOC;
451680f1 BV	91	goto err_out;
b2c19614 BV	92	}
b2c19614 BV	93
451680f1 BV	94	/* Import the Python module. */
451680f1 BV	95	if (!(d->py_mod = PyImport_ImportModule(name))) {
64c29e28 UH	96	/* TODO: Report exception message/traceback to err/dbg. */
	97	srd_warn("decoder: %s: import of '%s' failed", __func__, name);
	98	PyErr_Print();
451680f1 BV	99	PyErr_Clear();
	100	ret = SRD_ERR_PYTHON;
	101	goto err_out;
	102	}
b2c19614	103
451680f1 BV	104	/* Get the 'Decoder' class as Python object. */
	105	if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) {
	106	/* This generated an AttributeError exception. */
64c29e28	107	PyErr_Print();
451680f1 BV	108	PyErr_Clear();
	109	srd_err("Decoder class not found in protocol decoder module %s", name);
	110	ret = SRD_ERR_PYTHON;
	111	goto err_out;
	112	}
b2c19614	113
451680f1 BV	114	if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) {
	115	srd_dbg("sigrokdecode module not loaded");
	116	ret = SRD_ERR_PYTHON;
	117	goto err_out;
	118	}
b2c19614	119
451680f1 BV	120	if (!PyObject_IsSubclass(d->py_dec, py_basedec)) {
	121	srd_err("Decoder class in protocol decoder module %s is not "
	122	"a subclass of sigrokdecode.Decoder", name);
	123	ret = SRD_ERR_PYTHON;
	124	goto err_out;
	125	}
	126	Py_DecRef(py_basedec);
b2c19614	127
451680f1 BV	128	if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK) {
	129	return SRD_ERR_PYTHON;
	130	goto err_out;
	131	}
b2c19614	132
451680f1 BV	133	if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK) {
	134	return SRD_ERR_PYTHON;
	135	goto err_out;
	136	}
b2c19614	137
451680f1 BV	138	if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK) {
	139	return SRD_ERR_PYTHON;
	140	goto err_out;
	141	}
b2c19614	142
451680f1 BV	143	if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK) {
	144	return SRD_ERR_PYTHON;
	145	goto err_out;
	146	}
b2c19614	147
451680f1 BV	148	if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK) {
	149	return SRD_ERR_PYTHON;
	150	goto err_out;
	151	}
b2c19614	152
451680f1	153	/* TODO: Handle inputformats, outputformats. */
b2c19614 BV	154	d->inputformats = NULL;
	155	d->outputformats = NULL;
	156
15969949	157	/* Convert class annotation attribute to GSList of *char /
e97b6ef5	158	d->annotations = NULL;
451680f1 BV	159	if (PyObject_HasAttrString(d->py_dec, "annotations")) {
451680f1 BV	160	py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
15969949	161	if (!PyList_Check(py_annlist)) {
e97b6ef5	162	srd_err("Protocol decoder module %s annotations should be a list", name);
451680f1 BV	163	ret = SRD_ERR_PYTHON;
451680f1 BV	164	goto err_out;
15969949 BV	165	}
	166	alen = PyList_Size(py_annlist);
	167	for (i = 0; i < alen; i++) {
	168	py_ann = PyList_GetItem(py_annlist, i);
	169	if (!PyList_Check(py_ann) \|\| PyList_Size(py_ann) != 2) {
	170	srd_err("Protocol decoder module %s annotation %d should be a list with two elements",
	171	name, i+1);
451680f1 BV	172	ret = SRD_ERR_PYTHON;
451680f1 BV	173	goto err_out;
15969949 BV	174	}
15969949 BV	175
451680f1 BV	176	if (py_strlist_to_char(py_ann, &ann) != SRD_OK) {
	177	ret = SRD_ERR_PYTHON;
	178	goto err_out;
	179	}
e97b6ef5	180	d->annotations = g_slist_append(d->annotations, ann);
15969949 BV	181	}
	182	}
	183
b2c19614	184	*dec = d;
451680f1 BV	185	ret = SRD_OK;
	186
	187	err_out:
	188	if (ret != SRD_OK) {
	189	Py_XDECREF(py_basedec);
	190	Py_XDECREF(d->py_dec);
	191	Py_XDECREF(d->py_mod);
	192	g_free(d);
	193	}
b2c19614	194
451680f1 BV	195	return ret;
	196	}
	197
	198	char srd_decoder_doc(struct srd_decoder dec)
	199	{
e7edca07	200	PyObject *py_str;
451680f1 BV	201	char *doc;
451680f1 BV	202
e7edca07 BV	203	if (!PyObject_HasAttrString(dec->py_mod, "__doc__"))
	204	return NULL;
	205
	206	if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) {
	207	PyErr_Clear();
	208	return NULL;
	209	}
	210
451680f1	211	doc = NULL;
e7edca07 BV	212	if (py_str != Py_None)
	213	py_str_as_str(py_str, &doc);
	214	Py_DecRef(py_str);
451680f1 BV	215
451680f1 BV	216	return doc;
b2c19614 BV	217	}
	218
	219
	220	/**
451680f1 BV	221	* Unload decoder module.
	222	*
	223	* @param dec The decoder struct to be unloaded.
	224	*
	225	* @return SRD_OK upon success, a (negative) error code otherwise.
b2c19614 BV	226	*/
	227	int srd_unload_decoder(struct srd_decoder *dec)
	228	{
451680f1	229
b2c19614 BV	230	g_free(dec->id);
b2c19614 BV	231	g_free(dec->name);
b231546d	232	g_free(dec->longname);
b2c19614	233	g_free(dec->desc);
b231546d	234	g_free(dec->license);
b2c19614 BV	235
b2c19614 BV	236	/* TODO: Free everything in inputformats and outputformats. */
b2c19614 BV	237	if (dec->inputformats != NULL)
	238	g_slist_free(dec->inputformats);
	239	if (dec->outputformats != NULL)
	240	g_slist_free(dec->outputformats);
	241
451680f1	242	Py_XDECREF(dec->py_dec);
b2c19614 BV	243	Py_XDECREF(dec->py_mod);
	244
	245	/* TODO: (g_)free dec itself? */
	246
	247	return SRD_OK;
	248	}
	249
64c29e28 UH	250	/**
	251	* Check if the directory in the specified search path is a valid PD dir.
	252	*
	253	* A valid sigrok protocol decoder consists of a directory, which contains
	254	* at least two .py files (the special __init__.py and at least one additional
	255	* .py file which contains the actual PD code).
	256	*
	257	* TODO: We should also check that this is not a random other Python module,
	258	* but really a sigrok PD module by some means.
	259	*
	260	* @param search_path A string containing the (absolute) path to the directory
	261	* where 'entry' resides in.
	262	* @param entry A string containing the (relative) directory name of the
	263	* sigrok PD module. E.g. "i2c" for the I2C protocol decoder.
	264	* @return SRD_OK, if the directory is a valid sigrok PD, a negative error
	265	* code, such as SRD_ERR, otherwise.
	266	*/
	267	int srd_is_valid_pd_dir(const gchar search_path, const gchar entry)
	268	{
	269	GDir *dir;
	270	int py_files = 0, has_init_py = 0;
	271	gchar path1, path2, *file;
	272	GError *error;
	273
	274	/* TODO: Error handling. */
	275	path1 = g_build_filename(search_path, entry, NULL);
	276
	277	/* Check that it is a directory (and exists). */
	278	if (!g_file_test(path1, G_FILE_TEST_IS_DIR)) {
	279	srd_dbg("decoder: %s: '%s' not a directory or doesn't exist",
	280	__func__, entry);
	281	return SRD_ERR;
	282	}
	283
	284	if (!(dir = g_dir_open(path1, 0, &error))) { /* TODO: flags? */
	285	srd_dbg("decoder: %s: '%s' failed to open directory",
	286	__func__, entry);
	287	return SRD_ERR;
	288	}
	289
	290	/* Check the contents of the directory. */
	291	while ((file = g_dir_read_name(dir)) != NULL) {
	292	/* TODO: Error handling. */
	293	path2 = g_build_filename(path1, file, NULL);
	294
	295	/* Ignore non-files. */
	296	if (!g_file_test(path2, G_FILE_TEST_IS_REGULAR)) {
	297	srd_spew("decoder: %s: '%s' not a file, ignoring",
	298	__func__, file);
	299	continue;
	300	}
	301
	302	/* Count number of .py files. */
	303	if (g_str_has_suffix(path2, ".py")) {
	304	srd_spew("decoder: %s: found .py file: '%s'",
	305	__func__, file);
	306	py_files++;
	307	}
	308
	309	/* Check if it's an __init__.py file. */
	310	if (g_str_has_suffix(path2, "__init__.py")) {
	311	srd_spew("decoder: %s: found __init__.py file: '%s'",
	312	__func__, path2);
	313	has_init_py = 1;
314	}
315	}
316	g_dir_close(dir);
317
318	/* Check if the directory contains >= 2 .py files. /
319	if (py_files < 2) {
320	srd_dbg("decoder: %s: '%s' is not a valid PD dir, it doesn't "
321	"contain >= 2 .py files", __func__, entry);
322	return SRD_ERR;
323	}
324
325	/* Check if the directory contains an __init__.py file. */
326	if (!has_init_py) {
327	srd_dbg("decoder: %s: '%s' is not a valid PD dir, it doesn't "
328	"contain an __init__.py file", __func__, entry);
329	return SRD_ERR;
330	}
331
332	/* TODO: Check if it's a PD, not a random other Python module. */
333
334	return SRD_OK;
335	}
b2c19614 BV	336
	337	int srd_load_all_decoders(void)
	338	{
64c29e28 UH	339	GDir *dir;
64c29e28 UH	340	gchar *direntry;
b2c19614 BV	341	int ret;
	342	char *decodername;
	343	struct srd_decoder *dec;
64c29e28	344	GError *error;
b2c19614	345
64c29e28	346	if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) { /* TODO: flags? */
b2c19614 BV	347	Py_Finalize(); /* Returns void. */
	348	return SRD_ERR_DECODERS_DIR;
	349	}
	350
64c29e28 UH	351	while ((direntry = g_dir_read_name(dir)) != NULL) {
	352	/* Ignore directory entries which are not valid PDs. */
	353	if (srd_is_valid_pd_dir(DECODERS_DIR, direntry) != SRD_OK) {
	354	srd_dbg("decoder: %s: '%s' not a valid PD dir, "
	355	"ignoring it", __func__, direntry);
b2c19614	356	continue;
64c29e28	357	}
b2c19614	358
64c29e28 UH	359	/* The decoder name is the PD directory name (e.g. "i2c"). */
64c29e28 UH	360	decodername = g_strdup(direntry);
b2c19614 BV	361
	362	/* TODO: Error handling. Use g_try_malloc(). */
	363	if (!(dec = malloc(sizeof(struct srd_decoder)))) {
	364	Py_Finalize(); /* Returns void. */
	365	return SRD_ERR_MALLOC;
	366	}
	367
	368	/* Load the decoder. */
	369	/* TODO: Warning if loading fails for a decoder. */
	370	if ((ret = srd_load_decoder(decodername, &dec)) == SRD_OK) {
	371	/* Append it to the list of supported/loaded decoders. */
e5080882	372	pd_list = g_slist_append(pd_list, dec);
b2c19614 BV	373	}
b2c19614 BV	374	}
64c29e28	375	g_dir_close(dir);
b2c19614 BV	376
	377	return SRD_OK;
	378	}
	379
b2c19614 BV	380	/**
	381	* TODO
	382	*/
	383	int srd_unload_all_decoders(void)
	384	{
	385	GSList *l;
	386	struct srd_decoder *dec;
	387
	388	for (l = srd_list_decoders(); l; l = l->next) {
	389	dec = l->data;
	390	/* TODO: Error handling. */
	391	srd_unload_decoder(dec);
	392	}
	393
	394	return SRD_OK;
	395	}
	396
	397
	398