From ca0f47e362c0643b3b959b19e93bdaf27f2855f2 Mon Sep 17 00:00:00 2001
From: Eggert Jung <eggert.s.jung@wischhof13.de>
Date: Sun, 8 Nov 2020 18:32:40 +0100
Subject: [PATCH] task 9

---
 src/sectubs/exercises.py | 43 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/src/sectubs/exercises.py b/src/sectubs/exercises.py
index b4b12a0..ca6ccf2 100644
--- a/src/sectubs/exercises.py
+++ b/src/sectubs/exercises.py
@@ -4,7 +4,7 @@ class Exercise00:
     STUDENT_NAME = "Eggert Jung"
 
     def __init__(self, txt=""):
-        self.__txt = txt[:17] + "..."
+        self.__txt = txt
 
     @staticmethod
     def deadline(formatstr):
@@ -13,7 +13,7 @@ class Exercise00:
 
     @property
     def txt(self):
-        return self.__txt
+        return self.__txt[:17] + "..."
 
     def format(self, mode):
         if mode == "order":
@@ -35,3 +35,42 @@ class Exercise00:
             ret = ret + "{} = {}".format(items[0], items[1]) + "\n"
         return ret[:-1]
 
+    def __str__(self):
+        return b64_enc(self.__txt)
+
+def b64_enc_map(index):
+    if(index >= 0  and index < 26):
+        return chr(index + 0x41) # A-Z
+    elif(index >= 26 and index < 52):
+        return chr(index + 0x61 - 26) # a-z
+    elif(index >= 52 and index < 62):
+        return chr(index + 0x30 - 52) # 0-9
+    elif(index == 62):
+        return '+'
+    elif(index == 63):
+        return '/'
+    else:
+        return '='
+
+def b64_enc(str):
+    res = ""
+
+    for c in [(str[i:i+3]) for i in range(0, len(str), 3)]:
+        c = bytes(c, 'utf-8')
+        bits = [-1,-1,-1,-1]
+        try:
+            bits[0] = (c[0] & 0xFC)>>2
+
+            bits[1] = ((c[0] & 0x03)<<4)
+            bits[1] = bits[1] + ((c[1] & 0xF0)>>4)
+
+            bits[2] = ((c[1] & 0x0F)<<2)
+            bits[2] = bits[2] + ((c[2] & 0xC0)>>6)
+
+            bits[3] = (c[2] & 0x3F)
+        except IndexError:
+            pass
+        for i in range(4):
+            res = res + b64_enc_map(bits[i])
+    return res
+