--- a/src/helpers.py	Sat Oct 16 18:59:23 2021 +0200
+++ b/src/helpers.py	Sun Oct 17 11:14:46 2021 +0200
@@ -13,6 +13,26 @@
     if bytes_order == 'backward':
         b = b[::-1]
 
-    b = b.hex().upper()
+    return b
+
+
+def get_variable_int(file):
+    """
+    Get variable int from transaction data
+    More info: https://learnmeabitcoin.com/technical/varint
+    :param file: <class '_io.BufferedReader'>, required
+    :return: int
+    """
 
-    return b
+    first_byte = read_bytes(file, 1)
+
+    if first_byte == b'\xfd':
+        variable_int_bytes = read_bytes(file, 2)
+    elif first_byte == b'\xfe':
+        variable_int_bytes = read_bytes(file, 4)
+    elif first_byte == b'\xff':
+        variable_int_bytes = read_bytes(file, 8)
+    else:
+        variable_int_bytes = first_byte
+
+    return int.from_bytes(variable_int_bytes, 'little')