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/*
* 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.
*/
#pragma once
#include "can-utils.hpp"
class decoder_t
{
private:
openxc_DynamicField decoded_value;
public:
/* Public: Parse the signal's bitfield from the given data and return the raw
* value.
*
* signal - The signal to parse from the data.
* data - The data to parse the signal from.
* length - The length of the data array.
*
* Returns the raw value of the signal parsed as a bitfield from the given byte
* array.
*/
float parseSignalBitfield(const CanSignal& signal, const can_message_t& message);
/* Public: Find and return the corresponding string state for a CAN signal's
* raw integer value.
*
* This is an implementation of the SignalDecoder type signature, and can be
* used directly in the CanSignal.decoder field.
*
* signal - The details of the signal that contains the state mapping.
* signals - The list of all signals.
* signalCount - the length of the signals array.
* value - The numerical value that should map to a state.
* send - An output argument that will be set to false if the value should
* not be sent for any reason.
*
* Returns a DynamicField with a string value if a matching state is found in
* the signal. If an equivalent isn't found, send is sent to false and the
* return value is undefined.
*/
openxc_DynamicField stateDecoder(const CanSignal& signal, const CanSignal& signals,
float value, bool* send);
/* Public: Coerces a numerical value to a boolean.
*
* This is an implementation of the SignalDecoder type signature, and can be
* used directly in the CanSignal.decoder field.
*
* signal - The details of the signal that contains the state mapping.
* signals - The list of all signals
* signalCount - The length of the signals array
* value - The numerical value that will be converted to a boolean.
* send - An output argument that will be set to false if the value should
* not be sent for any reason.
*
* Returns a DynamicField with a boolean value of false if the raw signal value
* is 0.0, otherwise true. The 'send' argument will not be modified as this
* decoder always succeeds.
*/
openxc_DynamicField booleanDecoder(const CanSignal& signal, const CanSignal& signals,
float value, bool* send);
/* Public: Update the metadata for a signal and the newly received value.
*
* This is an implementation of the SignalDecoder type signature, and can be
* used directly in the CanSignal.decoder field.
*
* This function always flips 'send' to false.
*
* signal - The details of the signal that contains the state mapping.
* signals - The list of all signals.
* signalCount - The length of the signals array.
* value - The numerical value that will be converted to a boolean.
* send - This output argument will always be set to false, so the caller will
* know not to publish this value to the pipeline.
*
* The return value is undefined.
*/
openxc_DynamicField ignoreDecoder(const CanSignal& signal, const CanSignal& signals,
float value, bool* send);
/* Public: Wrap a raw CAN signal value in a DynamicField without modification.
*
* This is an implementation of the SignalDecoder type signature, and can be
* used directly in the CanSignal.decoder field.
*
* signal - The details of the signal that contains the state mapping.
* signals - The list of all signals
* signalCount - The length of the signals array
* value - The numerical value that will be wrapped in a DynamicField.
* send - An output argument that will be set to false if the value should
* not be sent for any reason.
*
* Returns a DynamicField with the original, unmodified raw CAN signal value as
* its numeric value. The 'send' argument will not be modified as this decoder
* always succeeds.
*/
openxc_DynamicField noopDecoder(const CanSignal& signal, const CanSignal& signals,
float value, bool* send);
/* Public: Parse a signal from a CAN message and apply any required
* transforations to get a human readable value.
*
* If the CanSignal has a non-NULL 'decoder' field, the raw CAN signal value
* will be passed to the decoder before returning.
*
* signal - The details of the signal to decode and forward.
* message - The CAN message that contains the signal.
* signals - an array of all active signals.
* signalCount - The length of the signals array.
* send - An output parameter that will be flipped to false if the value could
* not be decoded.
*
* The decoder returns an openxc_DynamicField, which may contain a number,
* string or boolean. If 'send' is false, the return value is undefined.
*/
openxc_DynamicField decodeSignal(const CanSignal& signal,
const can_message_t& message, const CanSignal& signals,
bool* send);
/* Public: Decode a transformed, human readable value from an raw CAN signal
* already parsed from a CAN message.
*
* This is the same as decodeSignal(const CanSignal&, CanMessage*, const CanSignal&, int,
* bool*) but you must parse the bitfield value of the signal from the CAN
* message yourself. This is useful if you need that raw value for something
* else.
*/
openxc_DynamicField decodeSignal(const CanSignal& signal, float value,
const CanSignal& signals, bool* send);
};
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