diff --git a/engine/slc.h b/engine/slc.h
index fbf2385..99a7264 100644
--- a/engine/slc.h
+++ b/engine/slc.h
@@ -31,6 +31,11 @@ enum SLC_IO_OP {
 	SLC_IO_CMD,
 };
 typedef enum SLC_IO_OP SLC_IO_OP;
+enum SLC_CODE_OP {
+	SLC_CODE_COUNT,
+	SLC_CODE_READ,
+};
+typedef enum SLC_CODE_OP SLC_CODE_OP;
 
 /**
  * Function-abstraction for a "symbol-table".
@@ -100,10 +105,23 @@ typedef uint32_t (*session)(SLC_SESSION_OP op, uint32_t i);
  */
 typedef const char* (*ioconn)(SLC_IO_OP op, const char *param);
 
+/**
+ * Function-abstraction for reading the source code.
+ *
+ * Operations:
+ *
+ * 		SLC_CODE_COUNT To get how much bytes are readable (i is unused). Returns size as uint32_t (full used)
+ * 		SLC_CODE_READ To read bytes of the source code at location i. Returns the byte char as uint32_t (low byte)
+ *
+ * @param op Defines which operation the caller wants.
+ * @param i In case of READ, the index of the data.
+ */
+typedef uint32_t (*coderead)(SLC_CODE_OP op, uint32_t i);
+
 /**
  * This function runs the main slc engine over a snippet of code.
  *
- * @param code The input source code to interpret / run.
+ * @param code_src The input source code to interpret / run.
  * @param symbol_table The symbol table to use
  * @param code_stack The code stack (return addresses) to use
  * @param data_stack The data stack (forth-like stack) to use
@@ -112,7 +130,7 @@ typedef const char* (*ioconn)(SLC_IO_OP op, const char *param);
  * @param io_connector The engine uses this to open/close pipes/files and write/read them.
  */
 void slc(
-	const char *code,
+	coderead code_src,
 	sym symbol_table,
 	stack code_stack,
 	stack data_stack,