Added needed functions for basics decode needs.

Change-Id: Ic6202927058ff693c7c5c9b04e25b7be2fba340c
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 93 insertions, 0 deletions

diff --git a/can-decoder.cpp b/can-decoder.cpp
new file mode 100644
index 0000000..000db2a
--- /dev/null
+++ b/can-decoder.cpp
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	 http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+Decoder::Decoder
+{
+	decoded_value = { .has_type = false,
+					.has_numeric_value = false,
+					.has_boolean_value = false,
+					.has_string_value = false };
+}
+
+float Decoder::parseSignalBitfield(CanSignal* signal, const CanMessage* message)
+{
+	 return bitfield_parse_float(message->data, CAN_MESSAGE_SIZE,
+			signal->bitPosition, signal->bitSize, signal->factor,
+			signal->offset);
+}
+
+openxc_DynamicField Decoder::noopDecoder(CanSignal* signal,
+        CanSignal* signals, int signalCount, float value, bool* send)
+{
+	decoded_value = { .has_type = true,
+					.type = openxc_DynamicField_Type_NUM,
+					.has_numeric_value = true,
+					.numeric_value = value };
+    return decoded_value;
+}
+
+openxc_DynamicField Decoder::booleanDecoder(CanSignal* signal,
+        CanSignal* signals, int signalCount, float value, bool* send)
+{
+	decoded_value = { .has_type = true,
+					.type = openxc_DynamicField_Type_BOOL,
+					.has_boolean_value = true,
+					.numeric_value = value == 0.0 ? false : true };
+	return decoded_value;
+}
+
+openxc_DynamicField Decoder::ignoreDecoder(CanSignal* signal,
+        CanSignal* signals, int signalCount, float value, bool* send)
+{
+    *send = false;
+    openxc_DynamicField decoded_value = {0};
+    return decoded_value;
+}
+
+openxc_DynamicField Decoder::stateDecoder(CanSignal* signal,
+        CanSignal* signals, int signalCount, float value, bool* send)
+{
+    openxc_DynamicField decoded_value = {0};
+    decoded_value.has_type = true;
+    decoded_value.type = openxc_DynamicField_Type_STRING;
+    decoded_value.has_string_value = true;
+
+    const CanSignalState* signalState = lookupSignalState(value, signal);
+    if(signalState != NULL) {
+        strcpy(decoded_value.string_value, signalState->name);
+    } else {
+        *send = false;
+    }
+    return decoded_value;
+}
+
+openxc_DynamicField Decoder::decodeSignal(CanSignal* signal,
+        float value, CanSignal* signals, int signalCount, bool* send)
+{
+    SignalDecoder decoder = signal->decoder == NULL ?
+				            noopDecoder : signal->decoder;
+    openxc_DynamicField decoded_value = decoder(signal, signals,
+            signalCount, value, send);
+    return decoded_value;
+}
+
+openxc_DynamicField Decoder::decodeSignal(CanSignal* signal,
+        const CanMessage* message, CanSignal* signals, int signalCount,
+        bool* send) {
+    float value = parseSignalBitfield(signal, message);
+    return decodeSignal(signal, value, signals, signalCount, send);
+}
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