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decoder.c
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/*
* This file is part of the libsigrokdecode project.
*
* Copyright (C) 2010 Uwe Hermann <[email protected]>
* Copyright (C) 2012 Bert Vermeulen <[email protected]>
* Copyright (C) 2019 DreamSourceLab <[email protected]>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include "libsigrokdecode.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 loaded protocol decoders. */
static GSList *pd_list = NULL;
/* srd.c */
extern SRD_PRIV GSList *searchpaths;
/* session.c */
extern SRD_PRIV GSList *sessions;
extern SRD_PRIV int max_session_id;
/* module_sigrokdecode.c */
extern SRD_PRIV PyObject *mod_sigrokdecode;
/** @endcond */
static gboolean srd_check_init(void)
{
if (max_session_id < 0) {
srd_err("Library is not initialized.");
return FALSE;
} else
return TRUE;
}
/**
* Returns the list of loaded protocol decoders.
*
* This is a GSList of pointers to struct srd_decoder items.
*
* @return List of decoders, NULL if none are supported or loaded.
*
* @since 0.2.0
*/
SRD_API const GSList *srd_decoder_list(void)
{
return pd_list;
}
/**
* Get the decoder with the specified ID.
*
* @param id The ID string of the decoder to return.
*
* @return The decoder with the specified ID, or NULL if not found.
*
* @since 0.1.0
*/
SRD_API struct srd_decoder *srd_decoder_get_by_id(const char *id)
{
GSList *l;
struct srd_decoder *dec;
for (l = pd_list; l; l = l->next) {
dec = l->data;
if (!strcmp(dec->id, id))
return dec;
}
return NULL;
}
static void channel_free(void *data)
{
struct srd_channel *ch = data;
if (!ch)
return;
g_free(ch->desc);
g_free(ch->name);
g_free(ch->id);
g_free(ch);
}
static void variant_free(void *data)
{
GVariant *var = data;
if (!var)
return;
g_variant_unref(var);
}
static void annotation_row_free(void *data)
{
struct srd_decoder_annotation_row *row = data;
if (!row)
return;
g_slist_free(row->ann_classes);
g_free(row->desc);
g_free(row->id);
g_free(row);
}
static void decoder_option_free(void *data)
{
struct srd_decoder_option *opt = data;
if (!opt)
return;
g_slist_free_full(opt->values, &variant_free);
variant_free(opt->def);
g_free(opt->desc);
g_free(opt->id);
g_free(opt);
}
static void decoder_free(struct srd_decoder *dec)
{
PyGILState_STATE gstate;
if (!dec)
return;
gstate = PyGILState_Ensure();
Py_XDECREF(dec->py_dec);
Py_XDECREF(dec->py_mod);
PyGILState_Release(gstate);
g_slist_free_full(dec->options, &decoder_option_free);
g_slist_free_full(dec->binary, (GDestroyNotify)&g_strfreev);
g_slist_free_full(dec->annotation_rows, &annotation_row_free);
g_slist_free_full(dec->annotations, (GDestroyNotify)&g_strfreev);
g_slist_free_full(dec->opt_channels, &channel_free);
g_slist_free_full(dec->channels, &channel_free);
g_slist_free_full(dec->outputs, g_free);
g_slist_free_full(dec->inputs, g_free);
g_slist_free_full(dec->tags, g_free);
g_free(dec->license);
g_free(dec->desc);
g_free(dec->longname);
g_free(dec->name);
g_free(dec->id);
g_free(dec);
}
static int get_channels(const struct srd_decoder *d, const char *attr,
GSList **out_pdchl, int offset)
{
PyObject *py_channellist, *py_entry;
struct srd_channel *pdch;
GSList *pdchl;
ssize_t i;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(d->py_dec, attr)) {
/* No channels of this type specified. */
PyGILState_Release(gstate);
return SRD_OK;
}
pdchl = NULL;
py_channellist = PyObject_GetAttrString(d->py_dec, attr);
if (!py_channellist)
goto except_out;
if (!PyTuple_Check(py_channellist)) {
srd_err("Protocol decoder %s %s attribute is not a tuple.",
d->name, attr);
goto err_out;
}
for (i = PyTuple_Size(py_channellist) - 1; i >= 0; i--) {
py_entry = PyTuple_GetItem(py_channellist, i);
if (!py_entry)
goto except_out;
if (!PyDict_Check(py_entry)) {
srd_err("Protocol decoder %s %s attribute is not "
"a list of dict elements.", d->name, attr);
goto err_out;
}
pdch = g_malloc(sizeof(struct srd_channel));
/* Add to list right away so it doesn't get lost. */
pdchl = g_slist_prepend(pdchl, pdch);
if (py_dictitem_as_str(py_entry, "id", &pdch->id) != SRD_OK)
goto err_out;
if (py_dictitem_as_str(py_entry, "name", &pdch->name) != SRD_OK)
goto err_out;
if (py_dictitem_as_str(py_entry, "desc", &pdch->desc) != SRD_OK)
goto err_out;
pdch->type = py_dictitem_to_int(py_entry, "type");
if (pdch->type < 0)
pdch->type = SRD_CHANNEL_COMMON;
pdch->order = offset + i;
}
Py_DECREF(py_channellist);
*out_pdchl = pdchl;
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch(NULL, "Failed to get %s list of %s decoder",
attr, d->name);
err_out:
g_slist_free_full(pdchl, &channel_free);
Py_XDECREF(py_channellist);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
static int get_options(struct srd_decoder *d)
{
PyObject *py_opts, *py_opt, *py_str, *py_values, *py_default, *py_item;
GSList *options;
struct srd_decoder_option *o;
GVariant *gvar;
ssize_t opt, i;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(d->py_dec, "options")) {
/* No options, that's fine. */
PyGILState_Release(gstate);
return SRD_OK;
}
options = NULL;
/* If present, options must be a tuple. */
py_opts = PyObject_GetAttrString(d->py_dec, "options");
if (!py_opts)
goto except_out;
if (!PyTuple_Check(py_opts)) {
srd_err("Protocol decoder %s: options attribute is not "
"a tuple.", d->id);
goto err_out;
}
for (opt = PyTuple_Size(py_opts) - 1; opt >= 0; opt--) {
py_opt = PyTuple_GetItem(py_opts, opt);
if (!py_opt)
goto except_out;
if (!PyDict_Check(py_opt)) {
srd_err("Protocol decoder %s options: each option "
"must consist of a dictionary.", d->name);
goto err_out;
}
o = g_malloc0(sizeof(struct srd_decoder_option));
/* Add to list right away so it doesn't get lost. */
options = g_slist_prepend(options, o);
py_str = PyDict_GetItemString(py_opt, "id");
if (!py_str) {
srd_err("Protocol decoder %s option %zd has no ID.",
d->name, opt);
goto err_out;
}
if (py_str_as_str(py_str, &o->id) != SRD_OK)
goto err_out;
py_str = PyDict_GetItemString(py_opt, "desc");
if (py_str) {
if (py_str_as_str(py_str, &o->desc) != SRD_OK)
goto err_out;
}
py_default = PyDict_GetItemString(py_opt, "default");
if (py_default) {
gvar = py_obj_to_variant(py_default);
if (!gvar) {
srd_err("Protocol decoder %s option 'default' has "
"invalid default value.", d->name);
goto err_out;
}
o->def = g_variant_ref_sink(gvar);
}
py_values = PyDict_GetItemString(py_opt, "values");
if (py_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);
goto err_out;
}
if (!PyTuple_Check(py_values)) {
srd_err("Option '%s' values should be a tuple.", o->id);
goto err_out;
}
for (i = PyTuple_Size(py_values) - 1; i >= 0; i--) {
py_item = PyTuple_GetItem(py_values, i);
if (!py_item)
goto except_out;
if (py_default && (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);
goto err_out;
}
gvar = py_obj_to_variant(py_item);
if (!gvar) {
srd_err("Protocol decoder %s option 'values' "
"contains invalid value.", d->name);
goto err_out;
}
o->values = g_slist_prepend(o->values,
g_variant_ref_sink(gvar));
}
}
}
d->options = options;
Py_DECREF(py_opts);
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch(NULL, "Failed to get %s decoder options", d->name);
err_out:
g_slist_free_full(options, &decoder_option_free);
Py_XDECREF(py_opts);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
/* Convert annotation class attribute to GSList of char **. */
static int get_annotations(struct srd_decoder *dec)
{
PyObject *py_annlist, *py_ann;
GSList *annotations;
char **annpair;
ssize_t i;
int ann_type = 7;
unsigned int j;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(dec->py_dec, "annotations")) {
PyGILState_Release(gstate);
return SRD_OK;
}
annotations = NULL;
py_annlist = PyObject_GetAttrString(dec->py_dec, "annotations");
if (!py_annlist)
goto except_out;
if (!PyTuple_Check(py_annlist)) {
srd_err("Protocol decoder %s annotations should "
"be a tuple.", dec->name);
goto err_out;
}
for (i = 0; i < PyTuple_Size(py_annlist); i++) {
py_ann = PyTuple_GetItem(py_annlist, i);
if (!py_ann)
goto except_out;
if (!PyTuple_Check(py_ann) || (PyTuple_Size(py_ann) != 3 && PyTuple_Size(py_ann) != 2)) {
srd_err("Protocol decoder %s annotation %zd should "
"be a tuple with two or three elements.",
dec->name, i + 1);
goto err_out;
}
if (py_strseq_to_char(py_ann, &annpair) != SRD_OK)
goto err_out;
annotations = g_slist_prepend(annotations, annpair);
if (PyTuple_Size(py_ann) == 3) {
ann_type = 0;
for (j = 0; j < strlen(annpair[0]); j++)
ann_type = ann_type * 10 + (annpair[0][j] - '0');
dec->ann_types = g_slist_append(dec->ann_types, GINT_TO_POINTER(ann_type));
} else if (PyTuple_Size(py_ann) == 2) {
dec->ann_types = g_slist_append(dec->ann_types, GINT_TO_POINTER(ann_type));
ann_type++;
}
}
dec->annotations = annotations;
Py_DECREF(py_annlist);
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch(NULL, "Failed to get %s decoder annotations", dec->name);
err_out:
g_slist_free_full(annotations, (GDestroyNotify)&g_strfreev);
Py_XDECREF(py_annlist);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
/* Convert annotation_rows to GSList of 'struct srd_decoder_annotation_row'. */
static int get_annotation_rows(struct srd_decoder *dec)
{
PyObject *py_ann_rows, *py_ann_row, *py_ann_classes, *py_item;
GSList *annotation_rows;
struct srd_decoder_annotation_row *ann_row;
ssize_t i, k;
size_t class_idx;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(dec->py_dec, "annotation_rows")) {
PyGILState_Release(gstate);
return SRD_OK;
}
annotation_rows = NULL;
py_ann_rows = PyObject_GetAttrString(dec->py_dec, "annotation_rows");
if (!py_ann_rows)
goto except_out;
if (!PyTuple_Check(py_ann_rows)) {
srd_err("Protocol decoder %s annotation_rows "
"must be a tuple.", dec->name);
goto err_out;
}
for (i = PyTuple_Size(py_ann_rows) - 1; i >= 0; i--) {
py_ann_row = PyTuple_GetItem(py_ann_rows, i);
if (!py_ann_row)
goto except_out;
if (!PyTuple_Check(py_ann_row) || PyTuple_Size(py_ann_row) != 3) {
srd_err("Protocol decoder %s annotation_rows "
"must contain only tuples of 3 elements.",
dec->name);
goto err_out;
}
ann_row = g_malloc0(sizeof(struct srd_decoder_annotation_row));
/* Add to list right away so it doesn't get lost. */
annotation_rows = g_slist_prepend(annotation_rows, ann_row);
py_item = PyTuple_GetItem(py_ann_row, 0);
if (!py_item)
goto except_out;
if (py_str_as_str(py_item, &ann_row->id) != SRD_OK)
goto err_out;
py_item = PyTuple_GetItem(py_ann_row, 1);
if (!py_item)
goto except_out;
if (py_str_as_str(py_item, &ann_row->desc) != SRD_OK)
goto err_out;
py_ann_classes = PyTuple_GetItem(py_ann_row, 2);
if (!py_ann_classes)
goto except_out;
if (!PyTuple_Check(py_ann_classes)) {
srd_err("Protocol decoder %s annotation_rows tuples "
"must have a tuple of numbers as 3rd element.",
dec->name);
goto err_out;
}
for (k = PyTuple_Size(py_ann_classes) - 1; k >= 0; k--) {
py_item = PyTuple_GetItem(py_ann_classes, k);
if (!py_item)
goto except_out;
if (!PyLong_Check(py_item)) {
srd_err("Protocol decoder %s annotation row "
"class tuple must only contain numbers.",
dec->name);
goto err_out;
}
class_idx = PyLong_AsSize_t(py_item);
if (PyErr_Occurred())
goto except_out;
ann_row->ann_classes = g_slist_prepend(ann_row->ann_classes,
GSIZE_TO_POINTER(class_idx));
}
}
dec->annotation_rows = annotation_rows;
Py_DECREF(py_ann_rows);
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch(NULL, "Failed to get %s decoder annotation rows",
dec->name);
err_out:
g_slist_free_full(annotation_rows, &annotation_row_free);
Py_XDECREF(py_ann_rows);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
/* Convert binary classes to GSList of char **. */
static int get_binary_classes(struct srd_decoder *dec)
{
PyObject *py_bin_classes, *py_bin_class;
GSList *bin_classes;
char **bin;
ssize_t i;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(dec->py_dec, "binary")) {
PyGILState_Release(gstate);
return SRD_OK;
}
bin_classes = NULL;
py_bin_classes = PyObject_GetAttrString(dec->py_dec, "binary");
if (!py_bin_classes)
goto except_out;
if (!PyTuple_Check(py_bin_classes)) {
srd_err("Protocol decoder %s binary classes should "
"be a tuple.", dec->name);
goto err_out;
}
for (i = PyTuple_Size(py_bin_classes) - 1; i >= 0; i--) {
py_bin_class = PyTuple_GetItem(py_bin_classes, i);
if (!py_bin_class)
goto except_out;
if (!PyTuple_Check(py_bin_class)
|| PyTuple_Size(py_bin_class) != 2) {
srd_err("Protocol decoder %s binary classes should "
"consist only of tuples of 2 elements.",
dec->name);
goto err_out;
}
if (py_strseq_to_char(py_bin_class, &bin) != SRD_OK)
goto err_out;
bin_classes = g_slist_prepend(bin_classes, bin);
}
dec->binary = bin_classes;
Py_DECREF(py_bin_classes);
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch(NULL, "Failed to get %s decoder binary classes",
dec->name);
err_out:
g_slist_free_full(bin_classes, (GDestroyNotify)&g_strfreev);
Py_XDECREF(py_bin_classes);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
/* Check whether the Decoder class defines the named method. */
static int check_method(PyObject *py_dec, const char *mod_name,
const char *method_name)
{
PyObject *py_method;
int is_callable;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
py_method = PyObject_GetAttrString(py_dec, method_name);
if (!py_method) {
srd_exception_catch(NULL, "Protocol decoder %s Decoder class "
"has no %s() method", mod_name, method_name);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
is_callable = PyCallable_Check(py_method);
Py_DECREF(py_method);
PyGILState_Release(gstate);
if (!is_callable) {
srd_err("Protocol decoder %s Decoder class attribute '%s' "
"is not a method.", mod_name, method_name);
return SRD_ERR_PYTHON;
}
return SRD_OK;
}
/**
* Get the API version of the specified decoder.
*
* @param d The decoder to use. Must not be NULL.
*
* @return The API version of the decoder, or 0 upon errors.
*
* @private
*/
SRD_PRIV long srd_decoder_apiver(const struct srd_decoder *d)
{
PyObject *py_apiver;
long apiver;
PyGILState_STATE gstate;
if (!d)
return 0;
gstate = PyGILState_Ensure();
py_apiver = PyObject_GetAttrString(d->py_dec, "api_version");
apiver = (py_apiver && PyLong_Check(py_apiver))
? PyLong_AsLong(py_apiver) : 0;
Py_XDECREF(py_apiver);
PyGILState_Release(gstate);
return apiver;
}
/**
* Load a protocol decoder module into the embedded Python interpreter.
*
* @param module_name The module name to be loaded.
*
* @return SRD_OK upon success, a (negative) error code otherwise.
*
* @since 0.1.0
*/
SRD_API int srd_decoder_load(const char *module_name)
{
PyObject *py_basedec;
struct srd_decoder *d;
long apiver;
int is_subclass;
const char *fail_txt;
PyGILState_STATE gstate;
if (!srd_check_init())
return SRD_ERR;
if (!module_name)
return SRD_ERR_ARG;
gstate = PyGILState_Ensure();
if (PyDict_GetItemString(PyImport_GetModuleDict(), module_name)) {
/* Module was already imported. */
PyGILState_Release(gstate);
return SRD_OK;
}
d = g_malloc0(sizeof(struct srd_decoder));
fail_txt = NULL;
d->py_mod = py_import_by_name(module_name);
if (!d->py_mod) {
fail_txt = "import by name failed";
goto except_out;
}
if (!mod_sigrokdecode) {
srd_err("sigrokdecode module not loaded.");
fail_txt = "sigrokdecode(3) not loaded";
goto err_out;
}
/* Get the 'Decoder' class as Python object. */
d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder");
if (!d->py_dec) {
fail_txt = "no 'Decoder' attribute in imported module";
goto except_out;
}
py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder");
if (!py_basedec) {
fail_txt = "no 'Decoder' attribute in sigrokdecode(3)";
goto except_out;
}
is_subclass = PyObject_IsSubclass(d->py_dec, py_basedec);
Py_DECREF(py_basedec);
if (!is_subclass) {
srd_err("Decoder class in protocol decoder module %s is not "
"a subclass of sigrokdecode.Decoder.", module_name);
fail_txt = "not a subclass of sigrokdecode.Decoder";
goto err_out;
}
/*
* Check that this decoder has the correct PD API version.
* PDs of different API versions are incompatible and cannot work.
*/
apiver = srd_decoder_apiver(d);
if (apiver != 3) {
srd_exception_catch(NULL, "Only PD API version 3 is supported, "
"decoder %s has version %ld", module_name, apiver);
fail_txt = "API version mismatch";
goto err_out;
}
/* Check Decoder class for required methods. */
if (check_method(d->py_dec, module_name, "reset") != SRD_OK) {
fail_txt = "no 'reset()' method";
goto err_out;
}
if (check_method(d->py_dec, module_name, "start") != SRD_OK) {
fail_txt = "no 'start()' method";
goto err_out;
}
if (check_method(d->py_dec, module_name, "decode") != SRD_OK) {
fail_txt = "no 'decode()' method";
goto err_out;
}
/* Store required fields in newly allocated strings. */
if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK) {
fail_txt = "no 'id' attribute";
goto err_out;
}
if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK) {
fail_txt = "no 'name' attribute";
goto err_out;
}
if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK) {
fail_txt = "no 'longname' attribute";
goto err_out;
}
if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK) {
fail_txt = "no 'desc' attribute";
goto err_out;
}
if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK) {
fail_txt = "no 'license' attribute";
goto err_out;
}
if (py_attr_as_strlist(d->py_dec, "inputs", &(d->inputs)) != SRD_OK) {
fail_txt = "missing or malformed 'inputs' attribute";
goto err_out;
}
if (py_attr_as_strlist(d->py_dec, "outputs", &(d->outputs)) != SRD_OK) {
fail_txt = "missing or malformed 'outputs' attribute";
goto err_out;
}
if (py_attr_as_strlist(d->py_dec, "tags", &(d->tags)) != SRD_OK) {
fail_txt = "missing or malformed 'tags' attribute";
goto err_out;
}
/* All options and their default values. */
if (get_options(d) != SRD_OK) {
fail_txt = "cannot get options";
goto err_out;
}
/* Check and import required channels. */
if (get_channels(d, "channels", &d->channels, 0) != SRD_OK) {
fail_txt = "cannot get channels";
goto err_out;
}
/* Check and import optional channels. */
if (get_channels(d, "optional_channels", &d->opt_channels,
g_slist_length(d->channels)) != SRD_OK) {
fail_txt = "cannot get optional channels";
goto err_out;
}
if (get_annotations(d) != SRD_OK) {
fail_txt = "cannot get annotations";
goto err_out;
}
if (get_annotation_rows(d) != SRD_OK) {
fail_txt = "cannot get annotation rows";
goto err_out;
}
if (get_binary_classes(d) != SRD_OK) {
fail_txt = "cannot get binary classes";
goto err_out;
}
PyGILState_Release(gstate);
/* Append it to the list of loaded decoders. */
pd_list = g_slist_append(pd_list, d);
return SRD_OK;
except_out:
/* Don't show a message for the "common" directory, it's not a PD. */
if (strcmp(module_name, "common")) {
srd_exception_catch(NULL, "Failed to load decoder %s: %s",
module_name, fail_txt);
}
fail_txt = NULL;
err_out:
if (fail_txt)
srd_err("Failed to load decoder %s: %s", module_name, fail_txt);
decoder_free(d);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
/**
* 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;
PyGILState_STATE gstate;
if (!srd_check_init())
return NULL;
if (!dec)
return NULL;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(dec->py_mod, "__doc__"))
goto err;
if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) {
srd_exception_catch(NULL, "Failed to get docstring");
goto err;
}
doc = NULL;
if (py_str != Py_None)
py_str_as_str(py_str, &doc);
Py_DECREF(py_str);
PyGILState_Release(gstate);
return doc;
err:
PyGILState_Release(gstate);
return NULL;
}
/**
* 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
*/
SRD_API int srd_decoder_unload(struct srd_decoder *dec)
{
struct srd_session *sess;
GSList *l;
if (!srd_check_init())
return SRD_ERR;
if (!dec)
return SRD_ERR_ARG;
/*
* 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);
}
/* Remove the PD from the list of loaded decoders. */
pd_list = g_slist_remove(pd_list, dec);
decoder_free(dec);
return SRD_OK;
}
static void srd_decoder_load_all_zip_path(char *zip_path)
{
PyObject *zipimport_mod, *zipimporter_class, *zipimporter;
PyObject *prefix_obj, *files, *key, *value, *set, *modname;
Py_ssize_t pos = 0;
char *prefix;
size_t prefix_len;
PyGILState_STATE gstate;
set = files = prefix_obj = zipimporter = zipimporter_class = NULL;
gstate = PyGILState_Ensure();
zipimport_mod = py_import_by_name("zipimport");
if (zipimport_mod == NULL)
goto err_out;
zipimporter_class = PyObject_GetAttrString(zipimport_mod, "zipimporter");
if (zipimporter_class == NULL)
goto err_out;
zipimporter = PyObject_CallFunction(zipimporter_class, "s", zip_path);
if (zipimporter == NULL)
goto err_out;
prefix_obj = PyObject_GetAttrString(zipimporter, "prefix");
if (prefix_obj == NULL)
goto err_out;
files = PyObject_GetAttrString(zipimporter, "_files");