[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 <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include <stdio.h>
#include <string.h>
#include <dirent.h>
#include <config.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. */
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 sigrokdecode_load_decoder(const char *name,
				     struct sigrokdecode_decoder **dec);

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

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

	/* 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 SIGROKDECODE_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 sigrokdecode_decoder));

		/* Load the decoder. */
		ret = sigrokdecode_load_decoder(decodername, &dec);

		/* Append it to the list of supported/loaded decoders. */
		list_pds = g_slist_append(list_pds, dec);
	}
	closedir(dir);

	return SIGROKDECODE_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 *sigrokdecode_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 sigrokdecode_decoder *sigrokdecode_get_decoder_by_id(const char *id)
{
	GSList *l;
	struct sigrokdecode_decoder *dec;

	for (l = sigrokdecode_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 SIGROKDECODE_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_func, PyObject *py_mod,
		 const char *key, char **outstr)
{
	PyObject *py_str;
	char *str;
	int ret;

	py_str = PyMapping_GetItemString(py_res, (char *)key);
	if (!py_str || !PyString_Check(py_str)) {
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		goto err_h_decref_func;
	}

	/*
	 * 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 = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		goto err_h_decref_str;
	}

	if (!(*outstr = strdup(str))) {
		ret = SIGROKDECODE_ERR_MALLOC;
		goto err_h_decref_str;
	}

	Py_XDECREF(py_str);

	return SIGROKDECODE_OK;

err_h_decref_str:
	Py_XDECREF(py_str);
err_h_decref_func:
	Py_XDECREF(py_func);
	Py_XDECREF(py_mod);

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

	return ret;
}

/**
 * TODO
 *
 * @param name TODO
 *
 * @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
 */
static int sigrokdecode_load_decoder(const char *name,
			      struct sigrokdecode_decoder **dec)
{
	struct sigrokdecode_decoder *d;
	PyObject *py_mod, *py_func, *py_res /* , *py_tuple */;
	int r;

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

	/* Get the 'register' function name as Python callable object. */
	py_func = PyObject_GetAttrString(py_mod, "register"); /* NEWREF */
	if (!py_func || !PyCallable_Check(py_func)) {
		if (PyErr_Occurred())
			PyErr_Print(); /* Returns void. */
		Py_XDECREF(py_mod);
		return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	}

	/* Call the 'register' function without arguments, get the result. */
	if (!(py_res = PyObject_CallFunction(py_func, NULL))) { /* NEWREF */
		PyErr_Print(); /* Returns void. */
		Py_XDECREF(py_func);
		Py_XDECREF(py_mod);
		return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	}

	if (!(d = malloc(sizeof(struct sigrokdecode_decoder))))
		return SIGROKDECODE_ERR_MALLOC;

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

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

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

	d->py_mod = py_mod;

	Py_XDECREF(py_res);
	Py_XDECREF(py_func);

	/* Get the 'decode' function name as Python callable object. */
	py_func = PyObject_GetAttrString(py_mod, "decode"); /* NEWREF */
	if (!py_func || !PyCallable_Check(py_func)) {
		if (PyErr_Occurred())
			PyErr_Print(); /* Returns void. */
		Py_XDECREF(py_mod);
		return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	}

	d->py_func = py_func;

	/* TODO: Handle inputformats, outputformats. */

	*dec = d;

	return SIGROKDECODE_OK;
}

/**
 * Run the specified decoder function.
 *
 * @param dec TODO
 * @param inbuf TODO
 * @param inbuflen TODO
 * @param outbuf TODO
 * @param outbuflen TODO
 *
 * @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
 */
int sigrokdecode_run_decoder(struct sigrokdecode_decoder *dec,
			     uint8_t *inbuf, uint64_t inbuflen,
			     uint8_t **outbuf, uint64_t *outbuflen)
{
	PyObject *py_mod, *py_func, *py_args, *py_value, *py_res;
	int r, ret;

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

	/* Return an error upon unusable input. */
	if (dec == NULL)
		return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
	if (inbuf == NULL)
		return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
	if (inbuflen == 0) /* No point in working on empty buffers. */
		return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
	if (outbuf == NULL)
		return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
	if (outbuflen == NULL)
		return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */

	/* TODO: Error handling. */
	py_mod = dec->py_mod;
	Py_XINCREF(py_mod);
	py_func = dec->py_func;
	Py_XINCREF(py_func);

	/* Create a Python tuple of size 1. */
	if (!(py_args = PyTuple_New(1))) { /* NEWREF */
		ret = SIGROKDECODE_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'? */
	if (!(py_value = Py_BuildValue("s#", inbuf, inbuflen))) { /* NEWREF */
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		goto err_run_decref_args;
	}

	/*
	 * IMPORTANT: PyTuple_SetItem() "steals" a reference to py_value!
	 * That means we are no longer responsible for Py_XDECREF()'ing it.
	 * It will automatically be free'd when the 'py_args' tuple is free'd.
	 */
	if (PyTuple_SetItem(py_args, 0, py_value) != 0) { /* STEAL */
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		Py_XDECREF(py_value); /* TODO: Ref. stolen upon error? */
		goto err_run_decref_args;
	}

	if (!(py_res = PyObject_CallObject(py_func, py_args))) { /* NEWREF */
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		goto err_run_decref_args;
	}

	if ((r = PyObject_AsCharBuffer(py_res, (const char **)outbuf,
				      (Py_ssize_t *)outbuflen))) {
		ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
		Py_XDECREF(py_res);
		goto err_run_decref_args;
	}

	ret = SIGROKDECODE_OK;

	Py_XDECREF(py_res);

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

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

	return ret;
}

/**
 * Shutdown libsigrokdecode.
 *
 * @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
 */
int sigrokdecode_shutdown(void)
{
	/* Py_Finalize() returns void, any finalization errors are ignored. */
	Py_Finalize();

	return SIGROKDECODE_OK;
}
Commit	Line	Data
1c6fa20f UH	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 <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */
	22	#include <stdio.h>
5c55017c	23	#include <string.h>
7c24d086	24	#include <dirent.h>
d842aebe	25	#include <config.h>
1c6fa20f	26
e6c7a826 UH	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
7c24d086	34	/* The list of protocol decoders. */
871d21e2	35	GSList *list_pds = NULL;
7c24d086	36
f800adc4 UH	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	*
2557ad9d	42	* - If it returns a "new reference", you're responsible to Py_XDECREF() it.
f800adc4	43	*
2557ad9d	44	* - If it returns a "borrowed reference", you MUST NOT Py_XDECREF() it.
f800adc4 UH	45	*
f800adc4 UH	46	* - If a function "steals" a reference, you no longer are responsible for
2557ad9d	47	* Py_XDECREF()ing it (someone else will do it for you at some point).
f800adc4 UH	48	*/
f800adc4 UH	49
53bec0cf UH	50	static int sigrokdecode_load_decoder(const char *name,
	51	struct sigrokdecode_decoder **dec);
	52
1c6fa20f UH	53	/**
	54	* Initialize libsigrokdecode.
	55	*
70e44845	56	* @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
1c6fa20f UH	57	*/
	58	int sigrokdecode_init(void)
	59	{
7c24d086 UH	60	DIR *dir;
7c24d086 UH	61	struct dirent *dp;
53bec0cf UH	62	char *decodername;
	63	struct sigrokdecode_decoder *dec;
	64	int ret;
7c24d086	65
1c6fa20f UH	66	/* Py_Initialize() returns void and usually cannot fail. */
	67	Py_Initialize();
	68
0895f56a	69	/* Add search directory for the protocol decoders. */
2454527d	70	/* FIXME: Check error code. */
70e44845	71	/* FIXME: What happens if this function is called multiple times? */
0895f56a	72	PyRun_SimpleString("import sys;"
10426068	73	"sys.path.append(r'" DECODERS_DIR "');");
1c6fa20f	74
7c24d086 UH	75	if (!(dir = opendir(DECODERS_DIR)))
	76	return SIGROKDECODE_ERR_DECODERS_DIR;
	77
	78	while ((dp = readdir(dir)) != NULL) {
276b55eb	79	if (!g_str_has_suffix(dp->d_name, ".py"))
7c24d086	80	continue;
53bec0cf UH	81
	82	/* Decoder name == filename (without .py suffix). */
	83	decodername = g_strndup(dp->d_name, strlen(dp->d_name) - 3);
	84
	85	/* TODO: Error handling. */
	86	dec = malloc(sizeof(struct sigrokdecode_decoder));
	87
	88	/* Load the decoder. */
	89	ret = sigrokdecode_load_decoder(decodername, &dec);
	90
	91	/* Append it to the list of supported/loaded decoders. */
	92	list_pds = g_slist_append(list_pds, dec);
7c24d086 UH	93	}
	94	closedir(dir);
	95
70e44845	96	return SIGROKDECODE_OK;
1c6fa20f UH	97	}
1c6fa20f UH	98
871d21e2 UH	99	/**
	100	* Returns the list of supported/loaded protocol decoders.
	101	*
	102	* This is a GSList containing the names of the decoders as strings.
	103	*
	104	* @return List of decoders, NULL if none are supported or loaded.
	105	*/
	106	GSList *sigrokdecode_list_decoders(void)
	107	{
	108	return list_pds;
	109	}
	110
53bec0cf UH	111	/**
	112	* Get the decoder with the specified ID.
	113	*
	114	* @param id The ID string of the decoder to return.
	115	* @return The decoder with the specified ID, or NULL if not found.
	116	*/
	117	struct sigrokdecode_decoder sigrokdecode_get_decoder_by_id(const char id)
	118	{
	119	GSList *l;
	120	struct sigrokdecode_decoder *dec;
	121
	122	for (l = sigrokdecode_list_decoders(); l; l = l->next) {
	123	dec = l->data;
	124	if (!strcmp(dec->id, id))
	125	return dec;
	126	}
	127
	128	return NULL;
	129	}
	130
5c55017c UH	131	/**
	132	* Helper function to handle Python strings.
	133	*
	134	* TODO: @param entries.
	135	*
3a9a7e38	136	* @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
70e44845	137	* The 'outstr' argument points to a malloc()ed string upon success.
5c55017c UH	138	*/
	139	static int h_str(PyObject py_res, PyObject py_func, PyObject *py_mod,
	140	const char key, char *outstr)
	141	{
	142	PyObject *py_str;
	143	char *str;
f7313eea	144	int ret;
5c55017c UH	145
	146	py_str = PyMapping_GetItemString(py_res, (char *)key);
	147	if (!py_str \|\| !PyString_Check(py_str)) {
f7313eea UH	148	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
f7313eea UH	149	goto err_h_decref_func;
5c55017c UH	150	}
5c55017c UH	151
6b08da24 UH	152	/*
	153	* PyString_AsString()'s returned string refers to an internal buffer
	154	* (not a copy), i.e. the data must not be modified, and the memory
	155	* must not be free()'d.
	156	*/
5c55017c	157	if (!(str = PyString_AsString(py_str))) {
f7313eea UH	158	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
f7313eea UH	159	goto err_h_decref_str;
5c55017c UH	160	}
	161
	162	if (!(*outstr = strdup(str))) {
f7313eea UH	163	ret = SIGROKDECODE_ERR_MALLOC;
f7313eea UH	164	goto err_h_decref_str;
5c55017c UH	165	}
5c55017c UH	166
2557ad9d	167	Py_XDECREF(py_str);
5c55017c	168
70e44845	169	return SIGROKDECODE_OK;
f7313eea UH	170
	171	err_h_decref_str:
	172	Py_XDECREF(py_str);
	173	err_h_decref_func:
	174	Py_XDECREF(py_func);
f7313eea UH	175	Py_XDECREF(py_mod);
	176
	177	if (PyErr_Occurred())
	178	PyErr_Print(); /* Returns void. */
	179
	180	return ret;
5c55017c UH	181	}
5c55017c UH	182
1c6fa20f UH	183	/**
	184	* TODO
	185	*
	186	* @param name TODO
70e44845	187	*
3a9a7e38	188	* @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
1c6fa20f	189	*/
53bec0cf	190	static int sigrokdecode_load_decoder(const char *name,
5c55017c	191	struct sigrokdecode_decoder **dec)
1c6fa20f	192	{
5c55017c	193	struct sigrokdecode_decoder *d;
c7bb5dff	194	PyObject py_mod, py_func, py_res / , py_tuple /;
5c55017c UH	195	int r;
5c55017c UH	196
5c55017c	197	/* "Import" the Python module. */
c7bb5dff	198	if (!(py_mod = PyImport_ImportModule(name))) { /* NEWREF */
6b08da24	199	PyErr_Print(); /* Returns void. */
5c55017c UH	200	return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
5c55017c UH	201	}
5c55017c UH	202
5c55017c UH	203	/* Get the 'register' function name as Python callable object. */
6b08da24	204	py_func = PyObject_GetAttrString(py_mod, "register"); /* NEWREF */
5c55017c UH	205	if (!py_func \|\| !PyCallable_Check(py_func)) {
5c55017c UH	206	if (PyErr_Occurred())
6b08da24	207	PyErr_Print(); /* Returns void. */
2557ad9d	208	Py_XDECREF(py_mod);
5c55017c UH	209	return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	210	}
	211
	212	/* Call the 'register' function without arguments, get the result. */
6b08da24 UH	213	if (!(py_res = PyObject_CallFunction(py_func, NULL))) { /* NEWREF */
6b08da24 UH	214	PyErr_Print(); /* Returns void. */
2557ad9d UH	215	Py_XDECREF(py_func);
2557ad9d UH	216	Py_XDECREF(py_mod);
5c55017c UH	217	return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	218	}
	219
	220	if (!(d = malloc(sizeof(struct sigrokdecode_decoder))))
	221	return SIGROKDECODE_ERR_MALLOC;
	222
	223	if ((r = h_str(py_res, py_func, py_mod, "id", &(d->id))) < 0)
	224	return r;
	225
	226	if ((r = h_str(py_res, py_func, py_mod, "name", &(d->name))) < 0)
	227	return r;
	228
	229	if ((r = h_str(py_res, py_func, py_mod, "desc", &(d->desc))) < 0)
	230	return r;
	231
	232	d->py_mod = py_mod;
	233
2557ad9d UH	234	Py_XDECREF(py_res);
2557ad9d UH	235	Py_XDECREF(py_func);
5c55017c UH	236
5c55017c UH	237	/* Get the 'decode' function name as Python callable object. */
6b08da24	238	py_func = PyObject_GetAttrString(py_mod, "decode"); /* NEWREF */
5c55017c UH	239	if (!py_func \|\| !PyCallable_Check(py_func)) {
5c55017c UH	240	if (PyErr_Occurred())
6b08da24	241	PyErr_Print(); /* Returns void. */
2557ad9d	242	Py_XDECREF(py_mod);
5c55017c UH	243	return SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
	244	}
	245
	246	d->py_func = py_func;
	247
	248	/* TODO: Handle inputformats, outputformats. */
	249
	250	*dec = d;
910e5fd8	251
70e44845	252	return SIGROKDECODE_OK;
1c6fa20f UH	253	}
	254
	255	/**
	256	* Run the specified decoder function.
	257	*
5c55017c	258	* @param dec TODO
1c6fa20f UH	259	* @param inbuf TODO
	260	* @param inbuflen TODO
	261	* @param outbuf TODO
	262	* @param outbuflen TODO
70e44845	263	*
3a9a7e38	264	* @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
1c6fa20f	265	*/
5c55017c	266	int sigrokdecode_run_decoder(struct sigrokdecode_decoder *dec,
2b45dd71	267	uint8_t *inbuf, uint64_t inbuflen,
2b45dd71	268	uint8_t *outbuf, uint64_t outbuflen)
1c6fa20f	269	{
5c55017c	270	PyObject py_mod, py_func, py_args, py_value, *py_res;
036e6f67	271	int r, ret;
1c6fa20f UH	272
	273	/* TODO: Use #defines for the return codes. */
	274
	275	/* Return an error upon unusable input. */
5c55017c UH	276	if (dec == NULL)
5c55017c UH	277	return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
1c6fa20f	278	if (inbuf == NULL)
5c55017c	279	return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
1c6fa20f	280	if (inbuflen == 0) /* No point in working on empty buffers. */
5c55017c	281	return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
1c6fa20f	282	if (outbuf == NULL)
5c55017c	283	return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
1c6fa20f	284	if (outbuflen == NULL)
5c55017c	285	return SIGROKDECODE_ERR_ARGS; /* TODO: More specific error? */
1c6fa20f	286
5c55017c UH	287	/* TODO: Error handling. */
5c55017c UH	288	py_mod = dec->py_mod;
2557ad9d	289	Py_XINCREF(py_mod);
5c55017c	290	py_func = dec->py_func;
2557ad9d	291	Py_XINCREF(py_func);
1c6fa20f UH	292
1c6fa20f UH	293	/* Create a Python tuple of size 1. */
6b08da24	294	if (!(py_args = PyTuple_New(1))) { /* NEWREF */
036e6f67 UH	295	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
036e6f67 UH	296	goto err_run_decref_func;
1c6fa20f UH	297	}
	298
	299	/* Get the input buffer as Python "string" (byte array). */
	300	/* TODO: int vs. uint64_t for 'inbuflen'? */
6b08da24	301	if (!(py_value = Py_BuildValue("s#", inbuf, inbuflen))) { /* NEWREF */
036e6f67 UH	302	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
036e6f67 UH	303	goto err_run_decref_args;
1c6fa20f UH	304	}
1c6fa20f UH	305
f800adc4 UH	306	/*
f800adc4 UH	307	* IMPORTANT: PyTuple_SetItem() "steals" a reference to py_value!
2557ad9d	308	* That means we are no longer responsible for Py_XDECREF()'ing it.
f800adc4 UH	309	* It will automatically be free'd when the 'py_args' tuple is free'd.
f800adc4 UH	310	*/
6b08da24	311	if (PyTuple_SetItem(py_args, 0, py_value) != 0) { /* STEAL */
036e6f67	312	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
2557ad9d	313	Py_XDECREF(py_value); /* TODO: Ref. stolen upon error? */
036e6f67	314	goto err_run_decref_args;
1c6fa20f UH	315	}
1c6fa20f UH	316
6b08da24	317	if (!(py_res = PyObject_CallObject(py_func, py_args))) { /* NEWREF */
036e6f67 UH	318	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
036e6f67 UH	319	goto err_run_decref_args;
1c6fa20f UH	320	}
1c6fa20f UH	321
036e6f67 UH	322	if ((r = PyObject_AsCharBuffer(py_res, (const char **)outbuf,
	323	(Py_ssize_t *)outbuflen))) {
	324	ret = SIGROKDECODE_ERR_PYTHON; /* TODO: More specific error? */
2557ad9d	325	Py_XDECREF(py_res);
036e6f67	326	goto err_run_decref_args;
1c6fa20f UH	327	}
1c6fa20f UH	328
036e6f67 UH	329	ret = SIGROKDECODE_OK;
036e6f67 UH	330
2557ad9d	331	Py_XDECREF(py_res);
036e6f67 UH	332
036e6f67 UH	333	err_run_decref_args:
2557ad9d	334	Py_XDECREF(py_args);
036e6f67	335	err_run_decref_func:
2557ad9d	336	Py_XDECREF(py_func);
2557ad9d	337	Py_XDECREF(py_mod);
1c6fa20f	338
036e6f67 UH	339	if (PyErr_Occurred())
	340	PyErr_Print(); /* Returns void. */
	341
	342	return ret;
1c6fa20f UH	343	}
	344
	345	/**
	346	* Shutdown libsigrokdecode.
	347	*
3a9a7e38	348	* @return SIGROKDECODE_OK upon success, a (negative) error code otherwise.
1c6fa20f UH	349	*/
	350	int sigrokdecode_shutdown(void)
	351	{
	352	/* Py_Finalize() returns void, any finalization errors are ignored. */
	353	Py_Finalize();
	354
70e44845	355	return SIGROKDECODE_OK;
1c6fa20f	356	}