chore: improve checksum API, making checksum constexpr. Update example.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

2 files changed, 24 insertions, 8 deletions

diff --git a/example/fix_tag_example/example.cpp b/example/fix_tag_example/example.cpp
index ac4f479..ba788de 100644
--- a/example/fix_tag_example/example.cpp
+++ b/example/fix_tag_example/example.cpp
@@ -3,7 +3,7 @@
 
 constexpr char default_fix[] = {
 	'8', '=', 'F', 'I', 'X', '.', '4', '.', '2', 0x01,
-	'9', '=', '6', '3', 0x01, // BodyLength = 63
+	'9', '=', '8', '7', 0x01, // BodyLength = 87
 	'3', '5', '=', 'A', 0x01,
 	'4', '9', '=', 'S', 'E', 'R', 'V', 'E', 'R', 0x01,
 	'5', '6', '=', 'C', 'L', 'I', 'E', 'N', 'T', 0x01,
@@ -11,9 +11,23 @@ constexpr char default_fix[] = {
 	'5', '2', '=', '2', '0', '0', '9', '0', '1', '0', '7', '-', '1', '8', ':', '1', '5', ':', '1', '6', 0x01,
 	'9', '8', '=', '0', 0x01,
 	'1', '0', '8', '=', '3', '0', 0x01,
-	'1', '0', '=', '1', '4', '3', 0x01, 0x00 // CheckSum = 143
+	'1', '0', '=', '6', '0', 0x01, 0x00 // CheckSum = 143
 };
 
+constexpr char default_fix_unchecked[] = {
+        '8', '=', 'F', 'I', 'X', '.', '4', '.', '2', 0x01,
+        '9', '=', '8', '0', 0x01, // BodyLength = 80
+        '3', '5', '=', 'A', 0x01,
+        '4', '9', '=', 'S', 'E', 'R', 'V', 'E', 'R', 0x01,
+        '5', '6', '=', 'C', 'L', 'I', 'E', 'N', 'T', 0x01,
+        '3', '4', '=', '1', '7', '7', 0x01,
+        '5', '2', '=', '2', '0', '0', '9', '0', '1', '0', '7', '-', '1', '8', ':', '1', '5', ':', '1', '6', 0x01,
+        '9', '8', '=', '0', 0x01,
+        '1', '0', '8', '=', '3', '0', 0x01,
+        0x00
+};
+
+
 int main(int argc, char** argv)
 {
 	ocl::fix::visitor	   basic_visitor;
@@ -27,7 +41,9 @@ int main(int argc, char** argv)
 	ocl::io::print(":key=49\n");
 	ocl::io::print(":value=", fix["49"], "\n");
 
-	ocl::io::print("checksum=", ocl::fix::try_index_checksum(fix), "\n");
+	ocl::io::print(":checksum=", ocl::fix::try_index_checksum(fix), "\n");
+	ocl::io::print(":checksum=", ocl::fix::operators::fix::checksum(default_fix_unchecked, 
+				sizeof(default_fix_unchecked)) + 1, "\n");
 
 	return 0;
 }
diff --git a/include/ocl/fix/checksum.hpp b/include/ocl/fix/checksum.hpp
index 31aee75..451e387 100644
--- a/include/ocl/fix/checksum.hpp
+++ b/include/ocl/fix/checksum.hpp
@@ -35,18 +35,18 @@ namespace ocl::fix
 		/// \param in_ Pointer to the message buffer.
 		/// \param len Length of the message in bytes.
 		/// \return The checksum value (sum of all bytes modulo 256).
-		inline checksum_type
+		inline constexpr checksum_type
 			checksum(const char* in_,
-				 const long  len)
+				 const std::size_t  len)
 		{
 			if (len < 1)
 				return 0L;
 
-			long long cks{};
+			checksum_type cks{};
 
-			for (long idx{}; idx < len; ++idx)
+			for (std::size_t idx{}; idx < len; ++idx)
 			{
-				cks += static_cast<unsigned char>(in_[idx]);
+				cks += static_cast<uint8_t>(in_[idx]);
 			}
 
 			return cks % 256;