X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=blobdiff_plain;f=decoder.c;h=1e22d0dd5c297ffd622c1651cc3c99bb2dd28434;hp=e69eae8da694ff77ef2e2dec7fecbdd70866c818;hb=65f6eb77a33e6e7185376b1d9b8f3f0c62273d27;hpb=09b0acbb8dd292794e7fc797352cda47c27a1355

diff --git a/decoder.c b/decoder.c
index e69eae8..1e22d0d 100644
--- a/decoder.c
+++ b/decoder.c
@@ -1,8 +1,8 @@
 /*
- * This file is part of the sigrok project.
+ * This file is part of the libsigrokdecode project.
  *
  * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
- * Copyright (C) 2011 Bert Vermeulen <bert@biot.com>
+ * 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
@@ -19,13 +19,39 @@
  */
 
 #include "config.h"
-#include <sigrokdecode.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */
-#include <dirent.h>
+#include "libsigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
+#include "libsigrokdecode-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. */
-GSList *list_pds = NULL;
-GSList *decoders = NULL;
+SRD_PRIV GSList *pd_list = NULL;
+
+/* srd.c */
+extern GSList *searchpaths;
+
+/* session.c */
+extern GSList *sessions;
 
+/* module_sigrokdecode.c */
+extern SRD_PRIV PyObject *mod_sigrokdecode;
+
+/** @endcond */
 
 /**
  * Returns the list of supported/loaded protocol decoders.
@@ -33,26 +59,29 @@ GSList *decoders = NULL;
  * This is a GSList containing the names of the decoders as strings.
  *
  * @return List of decoders, NULL if none are supported or loaded.
+ *
+ * @since 0.1.0 (but the API changed in 0.2.0)
  */
-GSList *srd_list_decoders(void)
+SRD_API const GSList *srd_decoder_list(void)
 {
-
-	return list_pds;
+	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.
+ *
+ * @since 0.1.0
  */
-struct srd_decoder *srd_get_decoder_by_id(const char *id)
+SRD_API struct srd_decoder *srd_decoder_get_by_id(const char *id)
 {
 	GSList *l;
 	struct srd_decoder *dec;
 
-	for (l = srd_list_decoders(); l; l = l->next) {
+	for (l = pd_list; l; l = l->next) {
 		dec = l->data;
 		if (!strcmp(dec->id, id))
 			return dec;
@@ -61,164 +90,642 @@ struct srd_decoder *srd_get_decoder_by_id(const char *id)
 	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;
+
+	py_probelist = PyObject_GetAttrString(d->py_dec, attr);
+	if (!PyTuple_Check(py_probelist)) {
+		srd_err("Protocol decoder %s %s attribute is not a tuple.",
+				d->name, attr);
+		return SRD_ERR_PYTHON;
+	}
+
+	if ((num_probes = PyTuple_Size(py_probelist)) == 0)
+		/* Empty probelist. */
+		return SRD_OK;
+
+	ret = SRD_OK;
+	for (i = 0; i < num_probes; i++) {
+		py_entry = PyTuple_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);
+			ret = SRD_ERR_PYTHON;
+			break;
+		}
+
+		if (!(p = g_try_malloc(sizeof(struct srd_probe)))) {
+			srd_err("Failed to g_malloc() struct srd_probe.");
+			ret = SRD_ERR_MALLOC;
+			break;
+		}
+
+		if ((py_dictitem_as_str(py_entry, "id", &p->id)) != SRD_OK) {
+			ret = SRD_ERR_PYTHON;
+			break;
+		}
+		if ((py_dictitem_as_str(py_entry, "name", &p->name)) != SRD_OK) {
+			ret = SRD_ERR_PYTHON;
+			break;
+		}
+		if ((py_dictitem_as_str(py_entry, "desc", &p->desc)) != SRD_OK) {
+			ret = SRD_ERR_PYTHON;
+			break;
+		}
+		p->order = i;
+
+		*pl = g_slist_append(*pl, p);
+	}
+
+	Py_DecRef(py_probelist);
+
+	return ret;
+}
+
+static int get_options(struct srd_decoder *d)
+{
+	PyObject *py_opts, *py_opt, *py_val, *py_default, *py_item;
+	Py_ssize_t opt, i;
+	struct srd_decoder_option *o;
+	GVariant *gvar;
+	gint64 lval;
+	double dval;
+	int overflow;
+	char *sval;
+
+	if (!PyObject_HasAttrString(d->py_dec, "options"))
+		/* No options, that's fine. */
+		return SRD_OK;
+
+	/* If present, options must be a tuple. */
+	py_opts = PyObject_GetAttrString(d->py_dec, "options");
+	if (!PyTuple_Check(py_opts)) {
+		srd_err("Protocol decoder %s: options attribute is not "
+				"a tuple.", d->id);
+		return SRD_ERR_PYTHON;
+	}
+
+	for (opt = 0; opt < PyTuple_Size(py_opts); opt++) {
+		py_opt = PyTuple_GetItem(py_opts, opt);
+		if (!PyDict_Check(py_opt)) {
+			srd_err("Protocol decoder %s options: each option "
+					"must consist of a dictionary.", d->name);
+			return SRD_ERR_PYTHON;
+		}
+		if (!(py_val = PyDict_GetItemString(py_opt, "id"))) {
+			srd_err("Protocol decoder %s option %d has no "
+					"id.", d->name);
+			return SRD_ERR_PYTHON;
+		}
+		o = g_malloc0(sizeof(struct srd_decoder_option));
+		py_str_as_str(py_val, &o->id);
+
+		if ((py_val = PyDict_GetItemString(py_opt, "desc")))
+			py_str_as_str(py_val, &o->desc);
+
+		if ((py_default = PyDict_GetItemString(py_opt, "default"))) {
+			if (PyUnicode_Check(py_default)) {
+				/* UTF-8 string */
+				py_str_as_str(py_default, &sval);
+				o->def = g_variant_new_string(sval);
+				g_free(sval);
+			} else if (PyLong_Check(py_default)) {
+				/* Long */
+				lval = PyLong_AsLongAndOverflow(py_default, &overflow);
+				if (overflow) {
+					/* Value is < LONG_MIN or > LONG_MAX */
+					PyErr_Clear();
+					srd_err("Protocol decoder %s option 'default' has "
+							"invalid default value.", d->name);
+					return SRD_ERR_PYTHON;
+				}
+				o->def = g_variant_new_int64(lval);
+			} else if (PyFloat_Check(py_default)) {
+				/* Float */
+				if ((dval = PyFloat_AsDouble(py_default)) == -1.0) {
+					PyErr_Clear();
+					srd_err("Protocol decoder %s option 'default' has "
+							"invalid default value.", d->name);
+					return SRD_ERR_PYTHON;
+				}
+				o->def = g_variant_new_double(dval);
+			} else {
+				srd_err("Protocol decoder %s option 'default' has "
+						"value of unsupported type '%s'.", d->name,
+						Py_TYPE(py_default)->tp_name);
+				return SRD_ERR_PYTHON;
+			}
+			g_variant_ref_sink(o->def);
+		}
+
+		if ((py_val = PyDict_GetItemString(py_opt, "values"))) {
+			/* A default is required if a list of values is
+			 * given, since it's used to verify their type. */
+			if (!o->def) {
+				srd_err("No default for option '%s'", o->id);
+				return SRD_ERR_PYTHON;
+			}
+			if (!PyTuple_Check(py_val)) {
+				srd_err("Option '%s' values should be a tuple.", o->id);
+				return SRD_ERR_PYTHON;
+			}
+			for (i = 0; i < PyTuple_Size(py_val); i++) {
+				py_item = PyTuple_GetItem(py_val, i);
+				if (Py_TYPE(py_default) != Py_TYPE(py_item)) {
+					srd_err("All values for option '%s' must be "
+							"of the same type as the default.",
+							o->id);
+					return SRD_ERR_PYTHON;
+				}
+				if (PyUnicode_Check(py_item)) {
+					/* UTF-8 string */
+					py_str_as_str(py_item, &sval);
+					gvar = g_variant_new_string(sval);
+					g_variant_ref_sink(gvar);
+					g_free(sval);
+					o->values = g_slist_append(o->values, gvar);
+				} else if (PyLong_Check(py_item)) {
+					/* Long */
+					lval = PyLong_AsLongAndOverflow(py_item, &overflow);
+					if (overflow) {
+						/* Value is < LONG_MIN or > LONG_MAX */
+						PyErr_Clear();
+						srd_err("Protocol decoder %s option 'values' "
+								"has invalid value.", d->name);
+						return SRD_ERR_PYTHON;
+					}
+					gvar = g_variant_new_int64(lval);
+					g_variant_ref_sink(gvar);
+					o->values = g_slist_append(o->values, gvar);
+				} else if (PyFloat_Check(py_item)) {
+					/* Float */
+					if ((dval = PyFloat_AsDouble(py_item)) == -1.0) {
+						PyErr_Clear();
+						srd_err("Protocol decoder %s option 'default' has "
+								"invalid default value.", d->name);
+						return SRD_ERR_PYTHON;
+					}
+					gvar = g_variant_new_double(dval);
+					g_variant_ref_sink(gvar);
+					o->values = g_slist_append(o->values, gvar);
+				}
+			}
+		}
+		d->options = g_slist_append(d->options, o);
+	}
+
+	return SRD_OK;
+}
 
 /**
- * TODO
+ * Load a protocol decoder module into the embedded Python interpreter.
  *
- * @param name TODO
+ * @param module_name The module name to be loaded.
  *
  * @return SRD_OK upon success, a (negative) error code otherwise.
+ *
+ * @since 0.1.0
  */
-int srd_load_decoder(const char *name, struct srd_decoder **dec)
+SRD_API int srd_decoder_load(const char *module_name)
 {
+	PyObject *py_basedec, *py_method, *py_attr, *py_annlist, *py_ann;
+	PyObject *py_bin_classes, *py_bin_class, *py_ann_rows, *py_ann_row;
+	PyObject *py_ann_classes, *py_long;
 	struct srd_decoder *d;
-	PyObject *py_mod, *py_res;
-	int r;
+	int ret, i, j;
+	char **ann, **bin, *ann_row_id, *ann_row_desc;
+	struct srd_probe *p;
+	GSList *l, *ann_classes;
+	struct srd_decoder_annotation_row *ann_row;
+
+	if (!srd_check_init())
+		return SRD_ERR;
 
-	fprintf(stdout, "%s: %s\n", __func__, name);
+	if (!module_name)
+		return SRD_ERR_ARG;
 
-	/* "Import" the Python module. */
-	if (!(py_mod = PyImport_ImportModule(name))) { /* NEWREF */
-		PyErr_Print(); /* Returns void. */
-		return SRD_ERR_PYTHON; /* TODO: More specific error? */
+	if (PyDict_GetItemString(PyImport_GetModuleDict(), module_name)) {
+		/* Module was already imported. */
+		return SRD_OK;
+	}
+
+	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. */
-	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->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 (!(d = malloc(sizeof(struct srd_decoder))))
-		return SRD_ERR_MALLOC;
+	if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) {
+		srd_dbg("sigrokdecode module not loaded.");
+		goto err_out;
+	}
 
-	if ((r = h_str(py_res, py_mod, "id", &(d->id))) < 0)
-		return r;
+	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);
 
-	if ((r = h_str(py_res, py_mod, "name", &(d->name))) < 0)
-		return r;
+	/* 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);
 
-	if ((r = h_str(py_res, py_mod, "longname",
-		       &(d->longname))) < 0)
-		return r;
+	/* 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);
+
+	/* 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;
+
+	/* All options and their default values. */
+	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);
+	}
 
-	if ((r = h_str(py_res, py_mod, "desc", &(d->desc))) < 0)
-		return r;
+	/* Convert annotation class attribute to GSList of char **. */
+	d->annotations = NULL;
+	if (PyObject_HasAttrString(d->py_dec, "annotations")) {
+		py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
+		if (!PyTuple_Check(py_annlist)) {
+			srd_err("Protocol decoder %s annotations should "
+					"be a tuple.", module_name);
+			goto err_out;
+		}
+		for (i = 0; i < PyTuple_Size(py_annlist); i++) {
+			py_ann = PyTuple_GetItem(py_annlist, i);
+			if (!PyTuple_Check(py_ann) || PyTuple_Size(py_ann) != 2) {
+				srd_err("Protocol decoder %s annotation %d should "
+						"be a tuple with two elements.", module_name, i + 1);
+				goto err_out;
+			}
+
+			if (py_strseq_to_char(py_ann, &ann) != SRD_OK) {
+				goto err_out;
+			}
+			d->annotations = g_slist_append(d->annotations, ann);
+		}
+	}
 
-	if ((r = h_str(py_res, py_mod, "longdesc",
-		       &(d->longdesc))) < 0)
-		return r;
+	/* Convert annotation_rows to GSList of 'struct srd_decoder_annotation_row'. */
+	d->annotation_rows = NULL;
+	if (PyObject_HasAttrString(d->py_dec, "annotation_rows")) {
+		py_ann_rows = PyObject_GetAttrString(d->py_dec, "annotation_rows");
+		if (!PyTuple_Check(py_ann_rows)) {
+			srd_err("Protocol decoder %s annotation row list "
+				"must be a tuple.", module_name);
+			goto err_out;
+		}
+		for (i = 0; i < PyTuple_Size(py_ann_rows); i++) {
+			py_ann_row = PyTuple_GetItem(py_ann_rows, i);
+			if (!PyTuple_Check(py_ann_row)) {
+				srd_err("Protocol decoder %s annotation rows "
+					"must be tuples.", module_name);
+				goto err_out;
+			}
+			if (PyTuple_Size(py_ann_row) != 3
+					|| !PyUnicode_Check(PyTuple_GetItem(py_ann_row, 0))
+					|| !PyUnicode_Check(PyTuple_GetItem(py_ann_row, 1))
+					|| !PyTuple_Check(PyTuple_GetItem(py_ann_row, 2))) {
+				srd_err("Protocol decoder %s annotation rows "
+					"must contain tuples containing two "
+					"strings and a tuple.", module_name);
+				goto err_out;
+			}
+
+			if (py_str_as_str(PyTuple_GetItem(py_ann_row, 0), &ann_row_id) != SRD_OK)
+				goto err_out;
+
+			if (py_str_as_str(PyTuple_GetItem(py_ann_row, 1), &ann_row_desc) != SRD_OK)
+				goto err_out;
+
+			py_ann_classes = PyTuple_GetItem(py_ann_row, 2);
+			ann_classes = NULL;
+			for (j = 0; j < PyTuple_Size(py_ann_classes); j++) {
+				py_long = PyTuple_GetItem(py_ann_classes, j);
+				if (!PyLong_Check(py_long)) {
+					srd_err("Protocol decoder %s annotation row class "
+						"list must only contain numbers.", module_name);
+					goto err_out;
+				}
+				ann_classes = g_slist_append(ann_classes,
+					GINT_TO_POINTER(PyLong_AsLong(py_long)));
+			}
+
+			ann_row = g_malloc0(sizeof(struct srd_decoder_annotation_row));
+			ann_row->id = ann_row_id;
+			ann_row->desc = ann_row_desc;
+			ann_row->ann_classes = ann_classes;
+			d->annotation_rows = g_slist_append(d->annotation_rows, ann_row);
+		}
+	}
 
-	if ((r = h_str(py_res, py_mod, "author", &(d->author))) < 0)
-		return r;
+	/* Convert binary class to GSList of char *. */
+	d->binary = NULL;
+	if (PyObject_HasAttrString(d->py_dec, "binary")) {
+		py_bin_classes = PyObject_GetAttrString(d->py_dec, "binary");
+		if (!PyTuple_Check(py_bin_classes)) {
+			srd_err("Protocol decoder %s binary classes should "
+					"be a tuple.", module_name);
+			goto err_out;
+		}
+		for (i = 0; i < PyTuple_Size(py_bin_classes); i++) {
+			py_bin_class = PyTuple_GetItem(py_bin_classes, i);
+			if (!PyTuple_Check(py_bin_class)) {
+				srd_err("Protocol decoder %s binary classes "
+						"should consist of tuples.", module_name);
+				goto err_out;
+			}
+			if (PyTuple_Size(py_bin_class) != 2
+					|| !PyUnicode_Check(PyTuple_GetItem(py_bin_class, 0))
+					|| !PyUnicode_Check(PyTuple_GetItem(py_bin_class, 1))) {
+				srd_err("Protocol decoder %s binary classes should "
+						"contain tuples with two strings.", module_name);
+				goto err_out;
+			}
+
+			if (py_strseq_to_char(py_bin_class, &bin) != SRD_OK) {
+				goto err_out;
+			}
+			d->binary = g_slist_append(d->binary, bin);
+		}
+	}
 
-	if ((r = h_str(py_res, py_mod, "email", &(d->email))) < 0)
-		return r;
+	/* Append it to the list of supported/loaded decoders. */
+	pd_list = g_slist_append(pd_list, d);
 
-	if ((r = h_str(py_res, py_mod, "license", &(d->license))) < 0)
-		return r;
+	ret = SRD_OK;
 
-	d->py_mod = py_mod;
-	d->py_decobj = py_res;
+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);
+	}
 
-	/* 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;
+	return ret;
+}
 
-	*dec = d;
+/**
+ * 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.
+ *
+ * @since 0.1.0
+ */
+SRD_API char *srd_decoder_doc_get(const struct srd_decoder *dec)
+{
+	PyObject *py_str;
+	char *doc;
 
-	return SRD_OK;
+	if (!srd_check_init())
+		return NULL;
+
+	if (!dec)
+		return NULL;
+
+	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);
+}
 
 /**
- * TODO
+ * Unload the specified protocol decoder.
+ *
+ * @param dec The struct srd_decoder to be unloaded.
+ *
+ * @return SRD_OK upon success, a (negative) error code otherwise.
+ *
+ * @since 0.1.0
  */
-int srd_unload_decoder(struct srd_decoder *dec)
+SRD_API int srd_decoder_unload(struct srd_decoder *dec)
 {
+	struct srd_decoder_option *o;
+	struct srd_session *sess;
+	GSList *l;
+
+	if (!srd_check_init())
+		return SRD_ERR;
+
+	if (!dec)
+		return SRD_ERR_ARG;
+
+	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.
+	 */
+	for (l = sessions; l; l = l->next) {
+		sess = l->data;
+		srd_inst_free_all(sess, 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->func);
-
-	/* TODO: Free everything in inputformats and outputformats. */
+	g_free(dec->license);
 
-	if (dec->inputformats != NULL)
-		g_slist_free(dec->inputformats);
-	if (dec->outputformats != NULL)
-		g_slist_free(dec->outputformats);
-
-	Py_XDECREF(dec->py_decobj);
+	/* The module's Decoder class. */
+	Py_XDECREF(dec->py_dec);
+	/* The module itself. */
 	Py_XDECREF(dec->py_mod);
 
-	/* TODO: (g_)free dec itself? */
+	g_free(dec);
 
 	return SRD_OK;
 }
 
-
-int srd_load_all_decoders(void)
+static void srd_decoder_load_all_path(char *path)
 {
-	DIR *dir;
-	struct dirent *dp;
-	int ret;
-	char *decodername;
-	struct srd_decoder *dec;
-
-	if (!(dir = opendir(DECODERS_DIR))) {
-		Py_Finalize(); /* Returns void. */
-		return SRD_ERR_DECODERS_DIR;
+	GDir *dir;
+	const gchar *direntry;
+
+	if (!(dir = g_dir_open(path, 0, NULL)))
+		/* Not really fatal */
+		return;
+
+	/* This ignores errors returned by srd_decoder_load(). That
+	 * function will have logged the cause, but in any case we
+	 * want to continue anyway. */
+	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);
 
-	while ((dp = readdir(dir)) != NULL) {
-		/* Ignore filenames which don't end with ".py". */
-		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);
+/**
+ * Load all installed protocol decoders.
+ *
+ * @return SRD_OK upon success, a (negative) error code otherwise.
+ *
+ * @since 0.1.0
+ */
+SRD_API int srd_decoder_load_all(void)
+{
+	GSList *l;
 
-		/* TODO: Error handling. Use g_try_malloc(). */
-		if (!(dec = malloc(sizeof(struct srd_decoder)))) {
-			Py_Finalize(); /* Returns void. */
-			return SRD_ERR_MALLOC;
-		}
+	if (!srd_check_init())
+		return SRD_ERR;
 
-		/* 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. */
-			list_pds = g_slist_append(list_pds, dec);
-		}
-	}
-	closedir(dir);
+	for (l = searchpaths; l; l = l->next)
+		srd_decoder_load_all_path(l->data);
 
 	return SRD_OK;
 }
 
-
 /**
- * TODO
+ * Unload all loaded protocol decoders.
+ *
+ * @return SRD_OK upon success, a (negative) error code otherwise.
+ *
+ * @since 0.1.0
  */
-int srd_unload_all_decoders(void)
+SRD_API int srd_decoder_unload_all(void)
 {
 	GSList *l;
 	struct srd_decoder *dec;
 
-	for (l = srd_list_decoders(); l; l = l->next) {
+	for (l = pd_list; l; l = l->next) {
 		dec = l->data;
-		/* TODO: Error handling. */
-		srd_unload_decoder(dec);
+		srd_decoder_unload(dec);
 	}
+	g_slist_free(pd_list);
+	pd_list = NULL;
 
 	return SRD_OK;
 }
 
-
-
+/** @} */