[libsigrokdecode.git] / decode.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include "config.h"
#include <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include <stdio.h>
#include <string.h>
#include <dirent.h>

/* Re-define some string functions for Python >= 3.0. */
#if PY_VERSION_HEX >= 0x03000000
#define PyString_AsString PyBytes_AsString
#define PyString_FromString PyBytes_FromString
#define PyString_Check PyBytes_Check
#endif

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

/*
 * Here's a quick overview of Python/C API reference counting.
 *
 * Check the Python/C API docs for what type of reference a function returns.
 *
 *  - If it returns a "new reference", you're responsible to Py_XDECREF() it.
 *
 *  - If it returns a "borrowed reference", you MUST NOT Py_XDECREF() it.
 *
 *  - If a function "steals" a reference, you no longer are responsible for
 *    Py_XDECREF()ing it (someone else will do it for you at some point).
 */

static int srd_load_decoder(const char *name, struct srd_decoder **dec);

static int _unitsize = 1;

static PyObject*
emb_put(PyObject *self, PyObject *args)
{
	PyObject *arg;
	
	(void)self;

	if (!PyArg_ParseTuple(args, "O:put", &arg))
		return NULL;

	fprintf(stderr, "sigrok.put() called by decoder:\n");
	PyObject_Print(arg, stdout, Py_PRINT_RAW);

	Py_RETURN_NONE;
}

static PyMethodDef EmbMethods[] = {
	{"put", emb_put, METH_VARARGS,
		"Accepts a dictionary with the following keys: time, duration, data"},
	{NULL, NULL, 0, NULL}
};

/**
 * Initialize libsigrokdecode.
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 */
int srd_init(void)
{
	DIR *dir;
	struct dirent *dp;
	char *decodername;
	struct srd_decoder *dec;
	int ret;

	/* Py_Initialize() returns void and usually cannot fail. */
	Py_Initialize();

	Py_InitModule("sigrok", EmbMethods);

	/* Add search directory for the protocol decoders. */
	/* FIXME: Check error code. */
	/* FIXME: What happens if this function is called multiple times? */
	PyRun_SimpleString("import sys;"
			   "sys.path.append(r'" DECODERS_DIR "');");

	if (!(dir = opendir(DECODERS_DIR)))
		return SRD_ERR_DECODERS_DIR;

	while ((dp = readdir(dir)) != NULL) {
		if (!g_str_has_suffix(dp->d_name, ".py"))
			continue;

		/* Decoder name == filename (without .py suffix). */
		decodername = g_strndup(dp->d_name, strlen(dp->d_name) - 3);

		/* TODO: Error handling. */
		dec = malloc(sizeof(struct srd_decoder));

		/* Load the decoder. */
		ret = srd_load_decoder(decodername, &dec);
		if (!ret)
		{
			/* Append it to the list of supported/loaded decoders. */
			list_pds = g_slist_append(list_pds, dec);
		}
	}
	closedir(dir);

	return SRD_OK;
}

/**
 * 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 list_pds;
}

/**
 * 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;
}

/**
 * Helper function to handle Python strings.
 *
 * TODO: @param entries.
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 *         The 'outstr' argument points to a malloc()ed string upon success.
 */
static int h_str(PyObject *py_res, PyObject *py_mod,
		 const char *key, char **outstr)
{
	PyObject *py_str;
	char *str;
	int ret;

	py_str = PyObject_GetAttrString(py_res, (char *)key); /* NEWREF */
	if (!py_str || !PyString_Check(py_str)) {
		ret = SRD_ERR_PYTHON; /* TODO: More specific error? */
		goto err_h_decref_mod;
	}

	/*
	 * PyString_AsString()'s returned string refers to an internal buffer
	 * (not a copy), i.e. the data must not be modified, and the memory
	 * must not be free()'d.
	 */
	if (!(str = PyString_AsString(py_str))) {
		ret = SRD_ERR_PYTHON; /* TODO: More specific error? */
		goto err_h_decref_str;
	}

	if (!(*outstr = g_strdup(str))) {
		ret = SRD_ERR_MALLOC;
		goto err_h_decref_str;
	}

	Py_XDECREF(py_str);

	return SRD_OK;

err_h_decref_str:
	Py_XDECREF(py_str);
err_h_decref_mod:
	Py_XDECREF(py_mod);

	if (PyErr_Occurred())
		PyErr_Print(); /* Returns void. */

	return ret;
}

/**
 * TODO
 *
 * @param name TODO
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 */
static int srd_load_decoder(const char *name,
			      struct srd_decoder **dec)
{
	struct srd_decoder *d;
	PyObject *py_mod, *py_res;
	PyObject *py_args, *py_value, *py_instance;
	int r;
	fprintf(stdout, "%s: %s\n", __func__, name);

	/* "Import" the Python module. */
	if (!(py_mod = PyImport_ImportModule(name))) { /* NEWREF */
		PyErr_Print(); /* Returns void. */
		return SRD_ERR_PYTHON; /* TODO: More specific error? */
	}

	/* Get the 'Decoder' class as Python object. */
	py_res = PyObject_GetAttrString(py_mod, "Decoder"); /* NEWREF */
	if (!py_res) {
		if (PyErr_Occurred())
			PyErr_Print(); /* Returns void. */
		Py_XDECREF(py_mod);
		fprintf(stderr, "Decoder class not found in PD module %s\n", name);
		return SRD_ERR_PYTHON; /* TODO: More specific error? */
	}

	if (!(d = malloc(sizeof(struct srd_decoder))))
		return SRD_ERR_MALLOC;

	/* We'll just use the name of the module for the id */
	d->id = strdup(name);

	if ((r = h_str(py_res, py_mod, "name", &(d->name))) < 0)
		return r;

	if ((r = h_str(py_res, py_mod, "longname",
		       &(d->longname))) < 0)
		return r;

	if ((r = h_str(py_res, py_mod, "desc", &(d->desc))) < 0)
		return r;

	if ((r = h_str(py_res, py_mod, "longdesc",
		       &(d->longdesc))) < 0)
		return r;

	if ((r = h_str(py_res, py_mod, "author", &(d->author))) < 0)
		return r;

	if ((r = h_str(py_res, py_mod, "email", &(d->email))) < 0)
		return r;

	if ((r = h_str(py_res, py_mod, "license", &(d->license))) < 0)
		return r;

	d->py_mod = py_mod;
	d->py_decobj = py_res;

	/* Create a Python tuple of size 1. */
	if (!(py_args = PyTuple_New(0))) { /* NEWREF */
		if (PyErr_Occurred())
			PyErr_Print(); /* Returns void. */
		
		Py_XDECREF(py_res);
		Py_XDECREF(py_mod);
		
		return SRD_ERR_PYTHON; /* TODO: More specific error? */
	}
	
	py_value = Py_BuildValue("{sssisd}", 
				  "driver", "demo",
				  "unitsize", _unitsize, //FIXME: Pass in a unitsize that matches the selected LA
				  "starttime", 129318231823.0 //TODO: Fill with something reasonable.
				  );
	/* Create an instance of the Decoder class */
	py_instance = PyObject_Call(py_res, py_args, py_value);
	if (!py_instance) {
		if (PyErr_Occurred())
			PyErr_Print(); /* Returns void. */
		Py_XDECREF(py_value); /* TODO: Ref. stolen upon error? */
		Py_XDECREF(py_res);
		Py_XDECREF(py_mod);
		fprintf(stderr, "Unable to create instance of Decoder class in PD module %s\n", name);
		return SRD_ERR_PYTHON; /* TODO: More specific error? */
	} 
	d->py_instance = py_instance;

	/* TODO: Handle func, inputformats, outputformats. */
	/* Note: They must at least be set to NULL, will segfault otherwise. */
	d->func = NULL;
	d->inputformats = NULL;
	d->outputformats = NULL;

	*dec = d;

	return SRD_OK;
}

/**
 * Run the specified decoder function.
 *
 * @param dec TODO
 * @param inbuf TODO
 * @param inbuflen TODO
 * @param outbuf TODO
 * @param outbuflen TODO
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 */
int srd_run_decoder(struct srd_decoder *dec,
			     uint8_t *inbuf, uint64_t inbuflen,
			     uint8_t **outbuf, uint64_t *outbuflen)
{
	PyObject *py_mod, *py_instance, *py_args, *py_value, *py_res;
	int r, ret;
	
	/* FIXME: Don't have a timebase available here. Make one up. */
	static int _timehack = 0;
	_timehack += inbuflen;

	/* TODO: Use #defines for the return codes. */

	/* Return an error upon unusable input. */
	if (dec == NULL)
		return SRD_ERR_ARGS; /* TODO: More specific error? */
	if (inbuf == NULL)
		return SRD_ERR_ARGS; /* TODO: More specific error? */
	if (inbuflen == 0) /* No point in working on empty buffers. */
		return SRD_ERR_ARGS; /* TODO: More specific error? */
	if (outbuf == NULL)
		return SRD_ERR_ARGS; /* TODO: More specific error? */
	if (outbuflen == NULL)
		return SRD_ERR_ARGS; /* TODO: More specific error? */
	
	/* TODO: Error handling. */
	py_mod = dec->py_mod;
	Py_XINCREF(py_mod);
	py_instance = dec->py_instance;
	Py_XINCREF(py_instance);

	/* Create a Python tuple of size 1. */
	if (!(py_args = PyTuple_New(1))) { /* NEWREF */
		ret = SRD_ERR_PYTHON; /* TODO: More specific error? */
		goto err_run_decref_func;
	}

	/* Get the input buffer as Python "string" (byte array). */
	/* TODO: int vs. uint64_t for 'inbuflen'? */

	py_value = Py_BuildValue("{sisiss#}", 
					  "time", _timehack,
					  "duration", 10,
					  "data", inbuf, inbuflen / _unitsize
					  );
	
	if (!(py_res = PyObject_CallMethod(py_instance, "decode", 
					"O", py_value))) { /* NEWREF */
		ret = SRD_ERR_PYTHON; /* TODO: More specific error? */
		goto err_run_decref_args;
	}


	ret = SRD_OK;

	Py_XDECREF(py_res);

err_run_decref_args:
	Py_XDECREF(py_args);
err_run_decref_func:
	Py_XDECREF(py_instance);
	Py_XDECREF(py_mod);

	if (PyErr_Occurred())
		PyErr_Print(); /* Returns void. */

	return ret;
}

/**
 * TODO
 */
static int srd_unload_decoder(struct srd_decoder *dec)
{
	g_free(dec->id);
	g_free(dec->name);
	g_free(dec->desc);
	g_free(dec->func);

	/* 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_instance);
	Py_XDECREF(dec->py_mod);

	return SRD_OK;
}

/**
 * TODO
 */
static 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;
}

/**
 * Shutdown libsigrokdecode.
 *
 * @return SRD_OK upon success, a (negative) error code otherwise.
 */
int srd_exit(void)
{
	/* Unload/free all decoders, and then the list of decoders itself. */
	/* TODO: Error handling. */
	srd_unload_all_decoders();
	g_slist_free(list_pds);

	/* Py_Finalize() returns void, any finalization errors are ignored. */
	Py_Finalize();

	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	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include "config.h"
	22	#include <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */
	23	#include <stdio.h>
	24	#include <string.h>
	25	#include <dirent.h>
	26
	27	/* Re-define some string functions for Python >= 3.0. */
	28	#if PY_VERSION_HEX >= 0x03000000
	29	#define PyString_AsString PyBytes_AsString
	30	#define PyString_FromString PyBytes_FromString
	31	#define PyString_Check PyBytes_Check
	32	#endif
	33
	34	/* The list of protocol decoders. */
	35	static GSList *list_pds = NULL;
	36
	37	/*
	38	* Here's a quick overview of Python/C API reference counting.
	39	*
	40	* Check the Python/C API docs for what type of reference a function returns.
	41	*
	42	* - If it returns a "new reference", you're responsible to Py_XDECREF() it.
	43	*
	44	* - If it returns a "borrowed reference", you MUST NOT Py_XDECREF() it.
	45	*
	46	* - If a function "steals" a reference, you no longer are responsible for
	47	* Py_XDECREF()ing it (someone else will do it for you at some point).
	48	*/
	49
	50	static int srd_load_decoder(const char name, struct srd_decoder *dec);
	51
	52	static int _unitsize = 1;
	53
	54	static PyObject*
	55	emb_put(PyObject self, PyObject args)
	56	{
	57	PyObject *arg;
	58
	59	(void)self;
	60
	61	if (!PyArg_ParseTuple(args, "O:put", &arg))
	62	return NULL;
	63
	64	fprintf(stderr, "sigrok.put() called by decoder:\n");
	65	PyObject_Print(arg, stdout, Py_PRINT_RAW);
	66
	67	Py_RETURN_NONE;
	68	}
	69
	70	static PyMethodDef EmbMethods[] = {
	71	{"put", emb_put, METH_VARARGS,
	72	"Accepts a dictionary with the following keys: time, duration, data"},
	73	{NULL, NULL, 0, NULL}
	74	};
	75
	76	/**
	77	* Initialize libsigrokdecode.
	78	*
	79	* @return SRD_OK upon success, a (negative) error code otherwise.
	80	*/
	81	int srd_init(void)
	82	{
	83	DIR *dir;
	84	struct dirent *dp;
	85	char *decodername;
	86	struct srd_decoder *dec;
	87	int ret;
	88
	89	/* Py_Initialize() returns void and usually cannot fail. */
	90	Py_Initialize();
	91
	92	Py_InitModule("sigrok", EmbMethods);
	93
	94	/* Add search directory for the protocol decoders. */
	95	/* FIXME: Check error code. */
	96	/* FIXME: What happens if this function is called multiple times? */
	97	PyRun_SimpleString("import sys;"
	98	"sys.path.append(r'" DECODERS_DIR "');");
	99
	100	if (!(dir = opendir(DECODERS_DIR)))
	101	return SRD_ERR_DECODERS_DIR;
	102
	103	while ((dp = readdir(dir)) != NULL) {
	104	if (!g_str_has_suffix(dp->d_name, ".py"))
	105	continue;
	106
	107	/* Decoder name == filename (without .py suffix). */
	108	decodername = g_strndup(dp->d_name, strlen(dp->d_name) - 3);
	109
	110	/* TODO: Error handling. */
	111	dec = malloc(sizeof(struct srd_decoder));
	112
	113	/* Load the decoder. */
	114	ret = srd_load_decoder(decodername, &dec);
	115	if (!ret)
	116	{
	117	/* Append it to the list of supported/loaded decoders. */
	118	list_pds = g_slist_append(list_pds, dec);
	119	}
	120	}
	121	closedir(dir);
	122
	123	return SRD_OK;
	124	}
	125
	126	/**
	127	* Returns the list of supported/loaded protocol decoders.
	128	*
	129	* This is a GSList containing the names of the decoders as strings.
	130	*
	131	* @return List of decoders, NULL if none are supported or loaded.
	132	*/
	133	GSList *srd_list_decoders(void)
	134	{
	135	return list_pds;
	136	}
	137
	138	/**
	139	* Get the decoder with the specified ID.
	140	*
	141	* @param id The ID string of the decoder to return.
	142	* @return The decoder with the specified ID, or NULL if not found.
	143	*/
	144	struct srd_decoder srd_get_decoder_by_id(const char id)
	145	{
	146	GSList *l;
	147	struct srd_decoder *dec;
	148
	149	for (l = srd_list_decoders(); l; l = l->next) {
	150	dec = l->data;
	151	if (!strcmp(dec->id, id))
	152	return dec;
	153	}
	154
	155	return NULL;
	156	}
	157
	158	/**
	159	* Helper function to handle Python strings.
	160	*
	161	* TODO: @param entries.
	162	*
	163	* @return SRD_OK upon success, a (negative) error code otherwise.
	164	* The 'outstr' argument points to a malloc()ed string upon success.
	165	*/
	166	static int h_str(PyObject py_res, PyObject py_mod,
	167	const char key, char *outstr)
	168	{
	169	PyObject *py_str;
	170	char *str;
	171	int ret;
	172
	173	py_str = PyObject_GetAttrString(py_res, (char )key); / NEWREF */
	174	if (!py_str \|\| !PyString_Check(py_str)) {
	175	ret = SRD_ERR_PYTHON; /* TODO: More specific error? */
	176	goto err_h_decref_mod;
	177	}
	178
	179	/*
	180	* PyString_AsString()'s returned string refers to an internal buffer
	181	* (not a copy), i.e. the data must not be modified, and the memory
	182	* must not be free()'d.
	183	*/
	184	if (!(str = PyString_AsString(py_str))) {
	185	ret = SRD_ERR_PYTHON; /* TODO: More specific error? */
	186	goto err_h_decref_str;
	187	}
	188
	189	if (!(*outstr = g_strdup(str))) {
	190	ret = SRD_ERR_MALLOC;
	191	goto err_h_decref_str;
	192	}
	193
	194	Py_XDECREF(py_str);
	195
	196	return SRD_OK;
	197
	198	err_h_decref_str:
	199	Py_XDECREF(py_str);
	200	err_h_decref_mod:
	201	Py_XDECREF(py_mod);
	202
	203	if (PyErr_Occurred())
	204	PyErr_Print(); /* Returns void. */
	205
	206	return ret;
	207	}
	208
	209	/**
	210	* TODO
	211	*
	212	* @param name TODO
	213	*
	214	* @return SRD_OK upon success, a (negative) error code otherwise.
	215	*/
	216	static int srd_load_decoder(const char *name,
	217	struct srd_decoder **dec)
	218	{
	219	struct srd_decoder *d;
	220	PyObject py_mod, py_res;
	221	PyObject py_args, py_value, *py_instance;
	222	int r;
	223	fprintf(stdout, "%s: %s\n", __func__, name);
	224
	225	/* "Import" the Python module. */
	226	if (!(py_mod = PyImport_ImportModule(name))) { /* NEWREF */
	227	PyErr_Print(); /* Returns void. */
	228	return SRD_ERR_PYTHON; /* TODO: More specific error? */
	229	}
	230
	231	/* Get the 'Decoder' class as Python object. */
	232	py_res = PyObject_GetAttrString(py_mod, "Decoder"); /* NEWREF */
	233	if (!py_res) {
	234	if (PyErr_Occurred())
	235	PyErr_Print(); /* Returns void. */
	236	Py_XDECREF(py_mod);
	237	fprintf(stderr, "Decoder class not found in PD module %s\n", name);
	238	return SRD_ERR_PYTHON; /* TODO: More specific error? */
	239	}
	240
	241	if (!(d = malloc(sizeof(struct srd_decoder))))
	242	return SRD_ERR_MALLOC;
	243
	244	/* We'll just use the name of the module for the id */
	245	d->id = strdup(name);
	246
	247	if ((r = h_str(py_res, py_mod, "name", &(d->name))) < 0)
	248	return r;
	249
	250	if ((r = h_str(py_res, py_mod, "longname",
	251	&(d->longname))) < 0)
	252	return r;
	253
	254	if ((r = h_str(py_res, py_mod, "desc", &(d->desc))) < 0)
	255	return r;
	256
	257	if ((r = h_str(py_res, py_mod, "longdesc",
	258	&(d->longdesc))) < 0)
	259	return r;
	260
	261	if ((r = h_str(py_res, py_mod, "author", &(d->author))) < 0)
	262	return r;
	263
	264	if ((r = h_str(py_res, py_mod, "email", &(d->email))) < 0)
	265	return r;
	266
	267	if ((r = h_str(py_res, py_mod, "license", &(d->license))) < 0)
	268	return r;
	269
	270	d->py_mod = py_mod;
	271	d->py_decobj = py_res;
	272
	273	/* Create a Python tuple of size 1. */
	274	if (!(py_args = PyTuple_New(0))) { /* NEWREF */
	275	if (PyErr_Occurred())
	276	PyErr_Print(); /* Returns void. */
	277
	278	Py_XDECREF(py_res);
	279	Py_XDECREF(py_mod);
	280
	281	return SRD_ERR_PYTHON; /* TODO: More specific error? */
	282	}
	283
	284	py_value = Py_BuildValue("{sssisd}",
	285	"driver", "demo",
	286	"unitsize", _unitsize, //FIXME: Pass in a unitsize that matches the selected LA
	287	"starttime", 129318231823.0 //TODO: Fill with something reasonable.
	288	);
	289	/* Create an instance of the Decoder class */
	290	py_instance = PyObject_Call(py_res, py_args, py_value);
	291	if (!py_instance) {
	292	if (PyErr_Occurred())
	293	PyErr_Print(); /* Returns void. */
	294	Py_XDECREF(py_value); /* TODO: Ref. stolen upon error? */
	295	Py_XDECREF(py_res);
	296	Py_XDECREF(py_mod);
	297	fprintf(stderr, "Unable to create instance of Decoder class in PD module %s\n", name);
	298	return SRD_ERR_PYTHON; /* TODO: More specific error? */
	299	}
	300	d->py_instance = py_instance;
	301
	302	/* TODO: Handle func, inputformats, outputformats. */
	303	/* Note: They must at least be set to NULL, will segfault otherwise. */
	304	d->func = NULL;
	305	d->inputformats = NULL;
	306	d->outputformats = NULL;
	307
	308	*dec = d;
	309
	310	return SRD_OK;
	311	}
	312
	313	/**
	314	* Run the specified decoder function.
	315	*
	316	* @param dec TODO
	317	* @param inbuf TODO
	318	* @param inbuflen TODO
	319	* @param outbuf TODO
	320	* @param outbuflen TODO
	321	*
	322	* @return SRD_OK upon success, a (negative) error code otherwise.
	323	*/
	324	int srd_run_decoder(struct srd_decoder *dec,
	325	uint8_t *inbuf, uint64_t inbuflen,
	326	uint8_t *outbuf, uint64_t outbuflen)
	327	{
	328	PyObject py_mod, py_instance, py_args, py_value, *py_res;
	329	int r, ret;
	330
	331	/* FIXME: Don't have a timebase available here. Make one up. */
	332	static int _timehack = 0;
	333	_timehack += inbuflen;
	334
	335	/* TODO: Use #defines for the return codes. */
	336
	337	/* Return an error upon unusable input. */
	338	if (dec == NULL)
	339	return SRD_ERR_ARGS; /* TODO: More specific error? */
	340	if (inbuf == NULL)
	341	return SRD_ERR_ARGS; /* TODO: More specific error? */
	342	if (inbuflen == 0) /* No point in working on empty buffers. */
	343	return SRD_ERR_ARGS; /* TODO: More specific error? */
	344	if (outbuf == NULL)
	345	return SRD_ERR_ARGS; /* TODO: More specific error? */
	346	if (outbuflen == NULL)
	347	return SRD_ERR_ARGS; /* TODO: More specific error? */
	348
	349	/* TODO: Error handling. */
	350	py_mod = dec->py_mod;
	351	Py_XINCREF(py_mod);
	352	py_instance = dec->py_instance;
	353	Py_XINCREF(py_instance);
	354
	355	/* Create a Python tuple of size 1. */
	356	if (!(py_args = PyTuple_New(1))) { /* NEWREF */
	357	ret = SRD_ERR_PYTHON; /* TODO: More specific error? */
	358	goto err_run_decref_func;
	359	}
	360
	361	/* Get the input buffer as Python "string" (byte array). */
	362	/* TODO: int vs. uint64_t for 'inbuflen'? */
	363
	364	py_value = Py_BuildValue("{sisiss#}",
	365	"time", _timehack,
	366	"duration", 10,
	367	"data", inbuf, inbuflen / _unitsize
	368	);
	369
	370	if (!(py_res = PyObject_CallMethod(py_instance, "decode",
	371	"O", py_value))) { /* NEWREF */
	372	ret = SRD_ERR_PYTHON; /* TODO: More specific error? */
	373	goto err_run_decref_args;
	374	}
	375
	376
	377	ret = SRD_OK;
	378
	379	Py_XDECREF(py_res);
	380
	381	err_run_decref_args:
	382	Py_XDECREF(py_args);
	383	err_run_decref_func:
	384	Py_XDECREF(py_instance);
	385	Py_XDECREF(py_mod);
	386
	387	if (PyErr_Occurred())
	388	PyErr_Print(); /* Returns void. */
	389
	390	return ret;
	391	}
	392
	393	/**
	394	* TODO
	395	*/
	396	static int srd_unload_decoder(struct srd_decoder *dec)
	397	{
	398	g_free(dec->id);
	399	g_free(dec->name);
	400	g_free(dec->desc);
	401	g_free(dec->func);
	402
	403	/* TODO: Free everything in inputformats and outputformats. */
	404
	405	if (dec->inputformats != NULL)
	406	g_slist_free(dec->inputformats);
	407	if (dec->outputformats != NULL)
	408	g_slist_free(dec->outputformats);
	409
	410	Py_XDECREF(dec->py_instance);
	411	Py_XDECREF(dec->py_mod);
	412
	413	return SRD_OK;
	414	}
	415
	416	/**
	417	* TODO
	418	*/
	419	static int srd_unload_all_decoders(void)
	420	{
	421	GSList *l;
	422	struct srd_decoder *dec;
	423
	424	for (l = srd_list_decoders(); l; l = l->next) {
	425	dec = l->data;
	426	/* TODO: Error handling. */
	427	srd_unload_decoder(dec);
	428	}
	429
	430	return SRD_OK;
	431	}
	432
	433	/**
	434	* Shutdown libsigrokdecode.
	435	*
	436	* @return SRD_OK upon success, a (negative) error code otherwise.
	437	*/
	438	int srd_exit(void)
	439	{
	440	/* Unload/free all decoders, and then the list of decoders itself. */
	441	/* TODO: Error handling. */
	442	srd_unload_all_decoders();
	443	g_slist_free(list_pds);
	444
	445	/* Py_Finalize() returns void, any finalization errors are ignored. */
	446	Py_Finalize();
	447
	448	return SRD_OK;
	449	}