--- a/src/lib/ASN1ContentHandler.h	Sat Jun 12 20:43:07 2021 +0200
+++ b/src/lib/ASN1ContentHandler.h	Sat Jun 12 21:29:18 2021 +0200
@@ -27,11 +27,50 @@
 class ASN1ContentHandler {
 public:
 
+	enum class CollectionType {
+		Sequence,
+		Set
+	};
+
+	enum class StringType {
+		OctetString,
+		UTF8String,
+		NumericString,
+		PrintableString,
+		T61String,
+		VideotexString,
+		IA5String,
+		GraphicString,
+		VisibleString,
+		GeneralString,
+		UniversalString,
+		CharacterString,
+		BMPString,
+	};
+
 	virtual ~ASN1ContentHandler() = default;
 
-	virtual void abc() = 0; // FIXME: remove dummy method
-	virtual void def(int a) = 0; // FIXME: remove dummy method
-	virtual void ghi(int a, int b) = 0; // FIXME: remove dummy method
+	virtual void writeCollectionStart(CollectionType type) = 0;
+	virtual void writeCollectionEnd() = 0;
+	virtual void writeBoolean(bool value) = 0;
+	virtual void writeNull() = 0;
+	virtual void writeInteger(int64_t value) = 0;
+	virtual void writeString(StringType type, std::string value) = 0;
+	// virtual void writeOID(std::string value) = 0;
+	// Object descriptor
+	// virtual void writeReal(float value) = 0;
+	// Enumerated
+	// Embedded PVD
+	// Relative OID
+	// TIME
+	// UTC time
+	// Generalized time
+	// Date
+	// Time of day
+	// Date-time
+	// Duration
+	// OID-IRI
+	// Relative OID-IRI
 
 };
 
@@ -46,16 +85,28 @@
 
 #define handler for (auto ___h : handlers) ___h
 
-	void abc() override {
-		handler->abc();
+	void writeCollectionStart(CollectionType type) {
+		handler->writeCollectionStart(type);
+	}
+
+	void writeCollectionEnd() {
+		handler->writeCollectionEnd();
 	}
 
-	void def(int a) override {
-		handler->def(a);
+	void writeBoolean(bool value) {
+		handler->writeBoolean(value);
 	}
 
-	void ghi(int a, int b) override {
-		handler->ghi(a, b);
+	void writeNull() {
+		handler->writeNull();
+	}
+
+	void writeInteger(int64_t value) {
+		handler->writeInteger(value);
+	}
+
+	void writeString(StringType type, std::string value) {
+		handler->writeString(type, value);
 	}
 
 #undef handler

--- a/src/lib/BasicASN1Reader.h	Sat Jun 12 20:43:07 2021 +0200
+++ b/src/lib/BasicASN1Reader.h	Sat Jun 12 21:29:18 2021 +0200
@@ -44,7 +44,7 @@
 
 	void update() override {
 		
-		handlers.abc();
+		handlers.writeNull();
 
 		if (state == State::A) {
 

--- a/src/lib/GenericASN1ContentHandler.h	Sat Jun 12 20:43:07 2021 +0200
+++ b/src/lib/GenericASN1ContentHandler.h	Sat Jun 12 21:29:18 2021 +0200
@@ -41,15 +41,29 @@
 	virtual ~GenericASN1ContentHandler() {
 	}
 
-	void abc() override {
-		handlers.writeComment("abc");
-	};
+	void writeCollectionStart(CollectionType type) override {
+		handlers.writeComment("collection start");
+	}
+
+	void writeCollectionEnd() override {
+		handlers.writeComment("collection end");
+	}
+
+	void writeBoolean(bool value) override {
+		handlers.writeComment("boolean");
+	}
 
-	void def(int a) override {
-	};
+	void writeNull() override {
+		handlers.writeComment("null");
+	}
 
-	void ghi(int a, int b) override {
-	};
+	void writeInteger(int64_t value) override {
+		handlers.writeComment("integer");
+	}
+
+	void writeString(StringType type, std::string value) override {
+		handlers.writeComment("string");
+	}
 
 };