Update function to encode and decode message

This commit update encoder and decoder files.
This new implementation allows to manage larger signals.

Bug-AGL : SPEC-2779

Change-Id: Iec6dfbd279863aa8b8e8f9e3ce951f0c8aa80dae
Signed-off-by: Arthur Guyader <arthur.guyader@iot.bzh>

4 files changed, 165 insertions, 91 deletions

diff --git a/low-can-binding/binding/low-can-cb.cpp b/low-can-binding/binding/low-can-cb.cpp
index ad9543d9..737a851a 100644
--- a/low-can-binding/binding/low-can-cb.cpp
+++ b/low-can-binding/binding/low-can-cb.cpp
@@ -669,7 +669,7 @@ static void write_signal(afb_req_t request, const std::string& name, json_object
 	}
 
 //	cfd = encoder_t::build_frame(sig, value);
-	message_t *message = encoder_t::build_message(sig,value);
+	message_t *message = encoder_t::build_message(sig,value,false,false);
 
 	if(! send_message(message, sig->get_message()->get_bus_device_name(), type) && send)
 	{
diff --git a/low-can-binding/can/can-decoder.cpp b/low-can-binding/can/can-decoder.cpp
index 46976b5c..3c811be6 100644
--- a/low-can-binding/can/can-decoder.cpp
+++ b/low-can-binding/can/can-decoder.cpp
@@ -21,6 +21,7 @@
 #include "../utils/openxc-utils.hpp"
 #include "message-definition.hpp"
 #include "../binding/low-can-hat.hpp"
+#include "../utils/converter.hpp"
 
 /// @brief Parses the signal's bitfield from the given data and returns the raw
 /// value.
@@ -33,8 +34,57 @@
 ///
 float decoder_t::parse_signal_bitfield(signal_t& signal, std::shared_ptr<message_t> message)
 {
-	 return bitfield_parse_float(message->get_data(), CAN_MESSAGE_SIZE,
-			signal.get_bit_position(), signal.get_bit_size(), signal.get_factor(),
+	const std::vector<uint8_t> data = message->get_data_vector();
+	std::vector<uint8_t> data_signal;
+	uint32_t bit_size = signal.get_bit_size();
+	uint32_t bit_position = signal.get_bit_position();
+
+	int new_start_byte = 0;
+	int new_end_byte = 0;
+	int new_start_bit = 0;
+	int new_end_bit = 0;
+
+	converter_t::signal_to_bits_bytes(bit_position, bit_size, new_start_byte, new_end_byte, new_start_bit, new_end_bit);
+
+	for(int i=new_start_byte;i<=new_end_byte;i++)
+	{
+		data_signal.push_back(data[i]);
+	}
+
+	uint8_t new_bit_size = 0;
+
+	if(bit_size > 255)
+	{
+		AFB_ERROR("Error signal %s to long bit size",signal.get_name().c_str());
+	}
+	else
+	{
+		new_bit_size = (uint8_t) bit_size;
+	}
+
+	uint8_t bit_offset = 0;
+	if(new_start_bit > 255)
+	{
+		AFB_ERROR("Too long signal offset %d", new_start_bit);
+	}
+	else
+	{
+		bit_offset = (uint8_t) new_start_bit;
+	}
+
+	uint16_t length = 0;
+
+	if(data_signal.size() > 65535)
+	{
+		AFB_ERROR("Too long data signal %s",signal.get_name().c_str());
+	}
+	else
+	{
+		length = (uint16_t) data_signal.size();
+	}
+
+	return bitfield_parse_float(data_signal.data(), length,
+			bit_offset, new_bit_size, signal.get_factor(),
 			signal.get_offset());
 }
 
diff --git a/low-can-binding/can/can-encoder.cpp b/low-can-binding/can/can-encoder.cpp
index ccd49722..44b5d9b2 100644
--- a/low-can-binding/can/can-encoder.cpp
+++ b/low-can-binding/can/can-encoder.cpp
@@ -20,75 +20,116 @@
 #include "canutil/write.h"
 #include "../utils/openxc-utils.hpp"
 #include "message-definition.hpp"
+#include "../utils/converter.hpp"
 
-/// @brief Write a value in a CAN signal in the destination buffer.
-///
-/// @param[in] signal - The CAN signal to write, including the bit position and bit size.
-/// @param[in] value - The encoded integer value to write in the CAN signal.
-/// @param[out] data - The destination buffer.
-/// @param[in] length - The length of the destination buffer.
-///
-/// @return Returns a canfd_frame struct initialized and ready to be send.
-const canfd_frame encoder_t::build_frame(const std::shared_ptr<signal_t>& signal, uint64_t value)
+/**
+ * @brief Allows to encode data for a signal
+ *
+ * @param sig The signal to know its location
+ * @param data The data to encod
+ * @param filter If true that will generate the filter BCM for the signal
+ * @param factor If true that will use the factor of the signal else 1
+ * @param offset If true that will use the offset of the signal else 0
+ */
+void encoder_t::encode_data(std::shared_ptr<signal_t> sig, std::vector<uint8_t> &data, bool filter, bool factor, bool offset)
 {
-	struct canfd_frame cf;
-	::memset(&cf, 0, sizeof(cf));
+	uint32_t bit_size = sig->get_bit_size();
+	uint32_t bit_position = sig->get_bit_position();
+	int new_start_byte = 0;
+	int new_end_byte = 0;
+	int new_start_bit_tmp = 0;
+	int new_end_bit = 0;
 
-	cf.can_id = signal->get_message()->get_id();
-	cf.len = signal->get_message()->is_fd() ?
-		 CANFD_MAX_DLEN : CAN_MAX_DLEN;
+	converter_t::signal_to_bits_bytes(bit_position, bit_size, new_start_byte, new_end_byte, new_start_bit_tmp, new_end_bit);
 
-	signal->set_last_value((float)value);
+	int len_signal_bytes_tmp = new_end_byte - new_start_byte + 1;
 
-	for(const auto& sig: signal->get_message()->get_signals())
+	uint8_t len_signal_bytes = 0;
+	if(len_signal_bytes_tmp > 255)
 	{
-		float last_value = sig->get_last_value();
-		bitfield_encode_float(last_value,
-					sig->get_bit_position(),
-					sig->get_bit_size(),
-					sig->get_factor(),
-					sig->get_offset(),
-					cf.data,
-					cf.len);
+		AFB_ERROR("Error signal %s too long",sig->get_name().c_str());
+	}
+	else
+	{
+		len_signal_bytes = (uint8_t) len_signal_bytes_tmp;
 	}
-	return cf;
-}
 
+	uint8_t new_start_bit = 0;
+	if(new_start_bit_tmp > 255)
+	{
+		AFB_ERROR("Error signal %s too long",sig->get_name().c_str());
+	}
+	else
+	{
+		new_start_bit = (uint8_t) new_start_bit_tmp;
+	}
 
-/**
- * @brief Allows to build a single frame message with correct data to be send
- *
- * @param signal The CAN signal to write, including the bit position and bit size.
- * @param value The encoded integer value to write in the CAN signal.
- * @param message A single frame message to complete
- * @return message_t*  The message that is generated
- */
-message_t* encoder_t::build_one_frame_message(const std::shared_ptr<signal_t>& signal, uint64_t value, message_t *message)
-{
-	signal->set_last_value((float)value);
-	uint8_t data_tab[message->get_length()];
-	::memset(&data_tab, 0, sizeof(data_tab));
-	std::vector<uint8_t> data;
+	uint8_t new_bit_size = 0;
+	if(bit_size > 255)
+	{
+		AFB_ERROR("Error signal %s to long bit size",sig->get_name().c_str());
+	}
+	else
+	{
+		new_bit_size = (uint8_t) bit_size;
+	}
 
-	for(const auto& sig: signal->get_message()->get_signals())
+	uint8_t data_signal[len_signal_bytes] = {0};
+	float factor_v = 1;
+	if(factor)
 	{
-		float last_value = sig->get_last_value();
-		bitfield_encode_float(last_value,
-					sig->get_bit_position(),
-					sig->get_bit_size(),
-					sig->get_factor(),
-					sig->get_offset(),
-					data_tab,
-					(uint8_t)message->get_length());
+		factor_v = sig->get_factor();
 	}
 
-	for (size_t i = 0; i < (uint8_t) message->get_length(); i++)
+	float offset_v = 0;
+	if(factor)
 	{
-		data.push_back(data_tab[i]);
+		offset_v = sig->get_offset();
 	}
 
-	message->set_data(data);
-	return message;
+	if(filter)
+	{
+		uint8_t tmp = 0;
+		int j=0;
+		for(int i=0;i<new_bit_size;i++)
+		{
+			int mask = 1 << ((i%8)+new_start_bit);
+
+			uint8_t mask_v = 0;
+			if(mask > 255)
+			{
+				AFB_ERROR("Error mask too large");
+			}
+			else
+			{
+				mask_v = (uint8_t) mask;
+			}
+			tmp = tmp|mask_v;
+
+			if(i%8 == 7)
+			{
+				data_signal[j] = tmp;
+				tmp = 0;
+				j++;
+			}
+		}
+		data_signal[j]=tmp;
+	}
+	else
+	{
+		bitfield_encode_float(	sig->get_last_value(),
+						new_start_bit,
+						new_bit_size,
+						factor_v,
+						offset_v,
+						data_signal,
+						len_signal_bytes);
+	}
+
+	for(size_t i = new_start_byte; i <= new_end_byte ; i++)
+	{
+		data[i] = data[i] | data_signal[i-new_start_byte];
+	}
 }
 
 /**
@@ -97,42 +138,23 @@ message_t* encoder_t::build_one_frame_message(const std::shared_ptr<signal_t>& s
  * @param signal The CAN signal to write, including the bit position and bit size.
  * @param value The encoded integer value to write in the CAN signal.
  * @param message A multi frame message to complete
+ * @param factor If true that will use the factor of the signal else 1
+ * @param offset If true that will use the offset of the signal else 0
  * @return message_t*  The message that is generated
  */
-message_t* encoder_t::build_multi_frame_message(const std::shared_ptr<signal_t>& signal, uint64_t value, message_t *message)
+message_t* encoder_t::build_frame(const std::shared_ptr<signal_t>& signal, uint64_t value, message_t *message, bool factor, bool offset)
 {
 	signal->set_last_value((float)value);
 	std::vector<uint8_t> data;
-
-	uint32_t msgs_len = signal->get_message()->get_length(); // multi frame - number of bytes
-	int number_of_frame = (int) msgs_len / 8;
-
-	uint8_t data_tab[number_of_frame][8] = {0};
-
-	for(const auto& sig: signal->get_message()->get_signals())
+	for(int i = 0; i<message->get_length();i++)
 	{
-
-		int frame_position = (int) sig->get_bit_position() / 64;
-		float last_value = sig->get_last_value();
-		uint8_t bit_position = sig->get_bit_position() - ((uint8_t)(64 * frame_position));
-
-		bitfield_encode_float(last_value,
-					bit_position,
-					sig->get_bit_size(),
-					sig->get_factor(),
-					sig->get_offset(),
-					data_tab[frame_position],
-					8);
+		data.push_back(0);
 	}
 
-	for (size_t i = 0; i < number_of_frame; i++)
+	for(const auto& sig: signal->get_message()->get_signals())
 	{
-		for(size_t j = 0; j < 8 ; j++)
-		{
-			data.push_back(data_tab[i][j]);
-		}
+		encode_data(sig,data,false,factor,offset);
 	}
-
 	message->set_data(data);
 	return message;
 }
@@ -142,28 +164,31 @@ message_t* encoder_t::build_multi_frame_message(const std::shared_ptr<signal_t>&
  *
  * @param signal The CAN signal to write, including the bit position and bit size.
  * @param value The encoded integer value to write in the CAN signal.
+ * @param factor If true that will use the factor of the signal else 1
+ * @param offset If true that will use the offset of the signal else 0
  * @return message_t* The message that is generated
  */
-message_t* encoder_t::build_message(const std::shared_ptr<signal_t>& signal, uint64_t value)
+message_t* encoder_t::build_message(const std::shared_ptr<signal_t>& signal, uint64_t value, bool factor, bool offset)
 {
 	message_t *message;
 	std::vector<uint8_t> data;
 	if(signal->get_message()->is_fd())
 	{
 		message = new can_message_t(CANFD_MAX_DLEN,signal->get_message()->get_id(),CANFD_MAX_DLEN,signal->get_message()->get_format(),false,CAN_FD_FRAME,data,0);
-		return build_one_frame_message(signal,value,message);
+
+		return build_frame(signal,value,message, factor, offset);
 	}
 #ifdef USE_FEATURE_J1939
 	else if(signal->get_message()->is_j1939())
 	{
 		message = new j1939_message_t(J1939_MAX_DLEN,signal->get_message()->get_length(),signal->get_message()->get_format(),data,0,J1939_NO_NAME,signal->get_message()->get_id(),J1939_NO_ADDR);
-		return build_multi_frame_message(signal,value,message);
+		return build_frame(signal,value,message, factor, offset);
 	}
 #endif
 	else
 	{
 		message = new can_message_t(CAN_MAX_DLEN,signal->get_message()->get_id(),CAN_MAX_DLEN,signal->get_message()->get_format(),false,0,data,0);
-		return build_one_frame_message(signal,value,message);
+		return build_frame(signal,value,message, factor, offset);
 	}
 }
 
diff --git a/low-can-binding/can/can-encoder.hpp b/low-can-binding/can/can-encoder.hpp
index c37521f4..d4505f04 100644
--- a/low-can-binding/can/can-encoder.hpp
+++ b/low-can-binding/can/can-encoder.hpp
@@ -28,13 +28,12 @@
 class encoder_t
 {
 public:
-	static const canfd_frame build_frame(const std::shared_ptr<signal_t>& signal, uint64_t value);
-	static message_t* build_message(const std::shared_ptr<signal_t>& signal, uint64_t value);
-	static message_t* build_one_frame_message(const std::shared_ptr<signal_t>& signal, uint64_t value, message_t *message);
-	static message_t* build_multi_frame_message(const std::shared_ptr<signal_t>& signal, uint64_t value, message_t *message);
+	static message_t* build_message(const std::shared_ptr<signal_t>& signal, uint64_t value, bool factor=true, bool offset=true);
+	static message_t* build_frame(const std::shared_ptr<signal_t>& signal, uint64_t value, message_t *message, bool factor=true, bool offset=true);
 	static uint64_t encode_state(const signal_t& signal, const std::string& value, bool* send);
 	static uint64_t encode_boolean(const signal_t& signal, bool value, bool* send);
 	static uint64_t encode_number(const signal_t& signal, float value, bool* send);
+	static void encode_data(std::shared_ptr<signal_t> sig, std::vector<uint8_t> &data, bool filter=false, bool factor=true, bool offset=true);
 
 	static uint64_t encode_DynamicField(signal_t& signal, const openxc_DynamicField& field, bool* send);
-};
+};
\ No newline at end of file