sign: handle decode methods sign from can value

- add enumeration that represents the way of encoding:
    enum sign_t
    {
		UNSIGNED = 0,
		SIGN_BIT = 1,
		ONES_COMPLEMENT = 2,
		TWOS_COMPLEMENT = 3,
		SIGN_BIT_EXTERN = 4
    };

- the function handle_sign allows to transform value if negative and
return the sign of the value in order to be multiplied at the end ot the
parcing

Bug-AGL: SPEC-3021

Change-Id: I5766a286488170d930422474b4c4f3a8578ca726
Signed-off-by: Clément Bénier <clement.benier@iot.bzh>
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 40 insertions, 21 deletions

diff --git a/plugins/agl-signals.cpp b/plugins/agl-signals.cpp
index e02b61ff..5f00e290 100644
--- a/plugins/agl-signals.cpp
+++ b/plugins/agl-signals.cpp
@@ -12,7 +12,7 @@ CTLP_LUA_REGISTER("TO-EDIT");
 std::shared_ptr<message_set_t> message_set =
 	std::make_shared<message_set_t>(message_set_t{0,"AGL Virtual Car",
 		{ // beginning message_definition_ vector
-			{std::make_shared<message_definition_t>(message_definition_t{"ls", 0x30,"", 0, 0 ,false, frequency_clock_t(5.00000f), true,
+			{std::make_shared<message_definition_t>(message_definition_t{"ls", 0x30,"", 0, 0, false, frequency_clock_t(5.00000f), true,
 				{ // beginning signals vector
 					{std::make_shared<signal_t> (signal_t{
 						"hvac.fan.speed",// generic_name
@@ -33,7 +33,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -55,7 +56,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -77,7 +79,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -99,7 +102,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})}
 					} // end signals vector
@@ -125,7 +129,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -147,7 +152,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -169,12 +175,13 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})}
 					} // end signals vector
 				})} // end message_definition entry
-,			{std::make_shared<message_definition_t>(message_definition_t{"hs", 0x3E9,"", 0, 0,false, frequency_clock_t(5.00000f), true,
+,			{std::make_shared<message_definition_t>(message_definition_t{"hs", 0x3E9,"", 0, 0, false, frequency_clock_t(5.00000f), true,
 				{ // beginning signals vector
 					{std::make_shared<signal_t> (signal_t{
 						"vehicle.average.speed",// generic_name
@@ -195,7 +202,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})}
 					} // end signals vector
@@ -221,7 +229,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -243,7 +252,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})}
 					} // end signals vector
@@ -269,7 +279,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -291,7 +302,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -313,7 +325,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -335,7 +348,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -357,7 +371,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})}
 					} // end signals vector
@@ -383,7 +398,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -405,7 +421,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -427,7 +444,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})},
 					{std::make_shared<signal_t> (signal_t{
@@ -449,7 +467,8 @@ std::shared_ptr<message_set_t> message_set =
 						false,// received
 						std::make_pair<bool, int>(false, 0),// multiplex
 						0,// is_big_endian
-						0,// is_signed
+						static_cast<sign_t>(0),// signed
+						-1,// bit_sign_position
 						""// unit
 					})}
 					} // end signals vector