configure.ac: Also check for Python 3.6.
[libsigrokdecode.git] / type_decoder.c
index 89b5ca1119c439d5caecd1279c2272dae907f413..dda0de28a2aab2fd9c6a991604eabeb031d49ed2 100644 (file)
@@ -50,9 +50,9 @@ static int convert_annotation(struct srd_decoder_inst *di, PyObject *obj,
        char **ann_text;
 
        /* Should be a list of [annotation class, [string, ...]]. */
-       if (!PyList_Check(obj) && !PyTuple_Check(obj)) {
+       if (!PyList_Check(obj)) {
                srd_err("Protocol decoder %s submitted an annotation that"
-                       " is not a list or tuple", di->decoder->name);
+                       " is not a list", di->decoder->name);
                return SRD_ERR_PYTHON;
        }
 
@@ -111,25 +111,25 @@ static int convert_binary(struct srd_decoder_inst *di, PyObject *obj,
        int bin_class;
        char *class_name, *buf;
 
-       /* Should be a tuple of (binary class, bytes). */
-       if (!PyTuple_Check(obj)) {
-               srd_err("Protocol decoder %s submitted non-tuple for SRD_OUTPUT_BINARY.",
+       /* Should be a list of [binary class, bytes]. */
+       if (!PyList_Check(obj)) {
+               srd_err("Protocol decoder %s submitted non-list for SRD_OUTPUT_BINARY.",
                        di->decoder->name);
                return SRD_ERR_PYTHON;
        }
 
        /* Should have 2 elements. */
-       if (PyTuple_Size(obj) != 2) {
-               srd_err("Protocol decoder %s submitted SRD_OUTPUT_BINARY tuple "
+       if (PyList_Size(obj) != 2) {
+               srd_err("Protocol decoder %s submitted SRD_OUTPUT_BINARY list "
                                "with %zd elements instead of 2", di->decoder->name,
                                PyList_Size(obj));
                return SRD_ERR_PYTHON;
        }
 
        /* The first element should be an integer. */
-       py_tmp = PyTuple_GetItem(obj, 0);
+       py_tmp = PyList_GetItem(obj, 0);
        if (!PyLong_Check(py_tmp)) {
-               srd_err("Protocol decoder %s submitted SRD_OUTPUT_BINARY tuple, "
+               srd_err("Protocol decoder %s submitted SRD_OUTPUT_BINARY list, "
                        "but first element was not an integer.", di->decoder->name);
                return SRD_ERR_PYTHON;
        }
@@ -141,9 +141,9 @@ static int convert_binary(struct srd_decoder_inst *di, PyObject *obj,
        }
 
        /* Second element should be bytes. */
-       py_tmp = PyTuple_GetItem(obj, 1);
+       py_tmp = PyList_GetItem(obj, 1);
        if (!PyBytes_Check(py_tmp)) {
-               srd_err("Protocol decoder %s submitted SRD_OUTPUT_BINARY tuple, "
+               srd_err("Protocol decoder %s submitted SRD_OUTPUT_BINARY list, "
                        "but second element was not bytes.", di->decoder->name);
                return SRD_ERR_PYTHON;
        }
@@ -369,16 +369,352 @@ static PyObject *Decoder_register(PyObject *self, PyObject *args,
        return py_new_output_id;
 }
 
+static int get_term_type(const char *v)
+{
+       switch (v[0]) {
+       case 'h':
+               return SRD_TERM_HIGH;
+       case 'l':
+               return SRD_TERM_LOW;
+       case 'r':
+               return SRD_TERM_RISING_EDGE;
+       case 'f':
+               return SRD_TERM_FALLING_EDGE;
+       case 'e':
+               return SRD_TERM_EITHER_EDGE;
+       case 'n':
+               return SRD_TERM_NO_EDGE;
+       }
+
+       return -1;
+}
+
+/**
+ * Get the pin values at the current sample number.
+ *
+ * @param di The decoder instance to use. Must not be NULL.
+ *           The number of channels must be >= 1.
+ *
+ * @return A newly allocated PyTuple containing the pin values at the
+ *         current sample number.
+ */
+static PyObject *get_current_pinvalues(const struct srd_decoder_inst *di)
+{
+       int i;
+       uint8_t sample;
+       const uint8_t *sample_pos;
+       int byte_offset, bit_offset;
+       PyObject *py_pinvalues;
+
+       if (!di) {
+               srd_err("Invalid decoder instance.");
+               return NULL;
+       }
+
+       py_pinvalues = PyTuple_New(di->dec_num_channels);
+
+       for (i = 0; i < di->dec_num_channels; i++) {
+               /* A channelmap value of -1 means "unused optional channel". */
+               if (di->dec_channelmap[i] == -1) {
+                       /* Value of unused channel is 0xff, instead of 0 or 1. */
+                       PyTuple_SetItem(py_pinvalues, i, PyLong_FromLong(0xff));
+               } else {
+                       sample_pos = di->inbuf + ((di->cur_samplenum - di->start_samplenum) * di->data_unitsize);
+                       byte_offset = di->dec_channelmap[i] / 8;
+                       bit_offset = di->dec_channelmap[i] % 8;
+                       sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
+                       PyTuple_SetItem(py_pinvalues, i, PyLong_FromLong(sample));
+               }
+       }
+
+       Py_IncRef(py_pinvalues);
+
+       return py_pinvalues;
+}
+
+/**
+ * Create a list of terms in the specified condition.
+ *
+ * If there are no terms in the condition, 'term_list' will be NULL.
+ *
+ * @param py_dict A Python dict containing terms. Must not be NULL.
+ * @param term_list Pointer to a GSList which will be set to the newly
+ *                  created list of terms. Must not be NULL.
+ *
+ * @return SRD_OK upon success, a negative error code otherwise.
+ */
+static int create_term_list(PyObject *py_dict, GSList **term_list)
+{
+       Py_ssize_t pos = 0;
+       PyObject *py_key, *py_value;
+       struct srd_term *term;
+       uint64_t num_samples_to_skip;
+       char *term_str;
+
+       if (!py_dict || !term_list)
+               return SRD_ERR_ARG;
+
+       /* "Create" an empty GSList of terms. */
+       *term_list = NULL;
+
+       /* Iterate over all items in the current dict. */
+       while (PyDict_Next(py_dict, &pos, &py_key, &py_value)) {
+               /* Check whether the current key is a string or a number. */
+               if (PyLong_Check(py_key)) {
+                       /* The key is a number. */
+                       /* TODO: Check if the number is a valid channel. */
+                       /* Get the value string. */
+                       if ((py_pydictitem_as_str(py_dict, py_key, &term_str)) != SRD_OK) {
+                               srd_err("Failed to get the value.");
+                               return SRD_ERR;
+                       }
+                       term = g_malloc0(sizeof(struct srd_term));
+                       term->type = get_term_type(term_str);
+                       term->channel = PyLong_AsLong(py_key);
+                       g_free(term_str);
+               } else if (PyUnicode_Check(py_key)) {
+                       /* The key is a string. */
+                       /* TODO: Check if it's "skip". */
+                       if ((py_pydictitem_as_long(py_dict, py_key, &num_samples_to_skip)) != SRD_OK) {
+                               srd_err("Failed to get number of samples to skip.");
+                               return SRD_ERR;
+                       }
+                       term = g_malloc0(sizeof(struct srd_term));
+                       term->type = SRD_TERM_SKIP;
+                       term->num_samples_to_skip = num_samples_to_skip;
+                       term->num_samples_already_skipped = 0;
+               } else {
+                       srd_err("Term key is neither a string nor a number.");
+                       return SRD_ERR;
+               }
+
+               /* Add the term to the list of terms. */
+               *term_list = g_slist_append(*term_list, term);
+       }
+
+       return SRD_OK;
+}
+
+/**
+ * Replace the current condition list with the new one.
+ *
+ * @param self TODO. Must not be NULL.
+ * @param args TODO. Must not be NULL.
+ *
+ * @retval SRD_OK The new condition list was set successfully.
+ * @retval SRD_ERR There was an error setting the new condition list.
+ *                 The contents of di->condition_list are undefined.
+ * @retval 9999 TODO.
+ */
+static int set_new_condition_list(PyObject *self, PyObject *args)
+{
+       struct srd_decoder_inst *di;
+       GSList *term_list;
+       PyObject *py_conditionlist, *py_conds, *py_dict;
+       int i, num_conditions, ret;
+
+       if (!self || !args)
+               return SRD_ERR_ARG;
+
+       /* Get the decoder instance. */
+       if (!(di = srd_inst_find_by_obj(NULL, self))) {
+               PyErr_SetString(PyExc_Exception, "decoder instance not found");
+               return SRD_ERR;
+       }
+
+       /* Parse the argument of self.wait() into 'py_conds'. */
+       if (!PyArg_ParseTuple(args, "O", &py_conds)) {
+               /* Let Python raise this exception. */
+               return SRD_ERR;
+       }
+
+       /* Check whether 'py_conds' is a dict or a list. */
+       if (PyList_Check(py_conds)) {
+               /* 'py_conds' is a list. */
+               py_conditionlist = py_conds;
+               num_conditions = PyList_Size(py_conditionlist);
+               if (num_conditions == 0)
+                       return 9999; /* The PD invoked self.wait([]). */
+       } else if (PyDict_Check(py_conds)) {
+               /* 'py_conds' is a dict. */
+               if (PyDict_Size(py_conds) == 0)
+                       return 9999; /* The PD invoked self.wait({}). */
+               /* Make a list and put the dict in there for convenience. */
+               py_conditionlist = PyList_New(1);
+               PyList_SetItem(py_conditionlist, 0, py_conds);
+               num_conditions = 1;
+       } else {
+               srd_err("Condition list is neither a list nor a dict.");
+               return SRD_ERR;
+       }
+
+       /* Free the old condition list. */
+       condition_list_free(di);
+
+       ret = SRD_OK;
+
+       /* Iterate over the conditions, set di->condition_list accordingly. */
+       for (i = 0; i < num_conditions; i++) {
+               /* Get a condition (dict) from the condition list. */
+               py_dict = PyList_GetItem(py_conditionlist, i);
+               if (!PyDict_Check(py_dict)) {
+                       srd_err("Condition is not a dict.");
+                       ret = SRD_ERR;
+                       break;
+               }
+
+               /* Create the list of terms in this condition. */
+               if ((ret = create_term_list(py_dict, &term_list)) < 0)
+                       break;
+
+               /* Add the new condition to the PD instance's condition list. */
+               di->condition_list = g_slist_append(di->condition_list, term_list);
+       }
+
+       Py_DecRef(py_conditionlist);
+
+       return ret;
+}
+
+static PyObject *Decoder_wait(PyObject *self, PyObject *args)
+{
+       int ret;
+       unsigned int i;
+       gboolean found_match;
+       struct srd_decoder_inst *di;
+       PyObject *py_pinvalues, *py_matched;
+
+       if (!self || !args)
+               return NULL;
+
+       if (!(di = srd_inst_find_by_obj(NULL, self))) {
+               PyErr_SetString(PyExc_Exception, "decoder instance not found");
+               Py_RETURN_NONE;
+       }
+
+       ret = set_new_condition_list(self, args);
+
+       if (ret == 9999) {
+               /* Empty condition list, automatic match. */
+               PyObject_SetAttrString(di->py_inst, "matched", Py_None);
+               /* Leave self.samplenum unchanged (== di->cur_samplenum). */
+               return get_current_pinvalues(di);
+       }
+
+       while (1) {
+               /* Wait for new samples to process. */
+               g_mutex_lock(&di->data_mutex);
+               while (!di->got_new_samples)
+                       g_cond_wait(&di->got_new_samples_cond, &di->data_mutex);
+
+               /* Check whether any of the current condition(s) match. */
+               ret = process_samples_until_condition_match(di, &found_match);
+
+               /* If there's a match, set self.samplenum etc. and return. */
+               if (found_match) {
+                       /* Set self.samplenum to the (absolute) sample number that matched. */
+                       PyObject_SetAttrString(di->py_inst, "samplenum",
+                               PyLong_FromLong(di->cur_samplenum));
+
+                       if (di->match_array && di->match_array->len > 0) {
+                               py_matched = PyTuple_New(di->match_array->len);
+                               for (i = 0; i < di->match_array->len; i++)
+                                       PyTuple_SetItem(py_matched, i, PyBool_FromLong(di->match_array->data[i]));
+                               PyObject_SetAttrString(di->py_inst, "matched", py_matched);
+                               match_array_free(di);
+                       } else {
+                               PyObject_SetAttrString(di->py_inst, "matched", Py_None);
+                       }
+       
+                       py_pinvalues = get_current_pinvalues(di);
+
+                       g_mutex_unlock(&di->data_mutex);
+
+                       return py_pinvalues;
+               }
+
+               /* No match, reset state for the next chunk. */
+               di->got_new_samples = FALSE;
+               di->handled_all_samples = TRUE;
+               di->start_samplenum = 0;
+               di->end_samplenum = 0;
+               di->inbuf = NULL;
+               di->inbuflen = 0;
+
+               /* Signal the main thread that we handled all samples. */
+               g_cond_signal(&di->handled_all_samples_cond);
+
+               g_mutex_unlock(&di->data_mutex);
+       }
+
+       Py_RETURN_NONE;
+}
+
+/**
+ * Return whether the specified channel was supplied to the decoder.
+ *
+ * @param self TODO. Must not be NULL.
+ * @param args TODO. Must not be NULL.
+ *
+ * @retval Py_True The channel has been supplied by the frontend.
+ * @retval Py_False The channel has been supplied by the frontend.
+ * @retval NULL An error occurred.
+ */
+static PyObject *Decoder_has_channel(PyObject *self, PyObject *args)
+{
+       int idx, max_idx;
+       struct srd_decoder_inst *di;
+       PyObject *py_channel;
+
+       if (!self || !args)
+               return NULL;
+
+       if (!(di = srd_inst_find_by_obj(NULL, self))) {
+               PyErr_SetString(PyExc_Exception, "decoder instance not found");
+               return NULL;
+       }
+
+       /* Parse the argument of self.has_channel() into 'py_channel'. */
+       if (!PyArg_ParseTuple(args, "O", &py_channel)) {
+               /* Let Python raise this exception. */
+               return NULL;
+       }
+
+       if (!PyLong_Check(py_channel)) {
+               PyErr_SetString(PyExc_Exception, "channel index not a number");
+               return NULL;
+       }
+
+       idx = PyLong_AsLong(py_channel);
+       max_idx = g_slist_length(di->decoder->channels)
+               + g_slist_length(di->decoder->opt_channels) - 1;
+
+       if (idx < 0 || idx > max_idx) {
+               srd_err("Invalid channel index %d/%d.", idx, max_idx);
+               PyErr_SetString(PyExc_Exception, "invalid channel");
+               return NULL;
+       }
+
+       return (di->dec_channelmap[idx] == -1) ? Py_False : Py_True;
+}
+
 static PyMethodDef Decoder_methods[] = {
        {"put", Decoder_put, METH_VARARGS,
         "Accepts a dictionary with the following keys: startsample, endsample, data"},
        {"register", (PyCFunction)Decoder_register, METH_VARARGS|METH_KEYWORDS,
                        "Register a new output stream"},
+       {"wait", Decoder_wait, METH_VARARGS,
+                       "Wait for one or more conditions to occur"},
+       {"has_channel", Decoder_has_channel, METH_VARARGS,
+                       "Report whether a channel was supplied"},
        {NULL, NULL, 0, NULL}
 };
 
-/** Create the sigrokdecode.Decoder type.
+/**
+ * Create the sigrokdecode.Decoder type.
+ *
  * @return The new type object.
+ *
  * @private
  */
 SRD_PRIV PyObject *srd_Decoder_type_new(void)