encoder and compare

main.py

@@ -26,12 +26,78 @@ def Q_statistik():
     return freq, prob, info_content, entropy
 
 
+def fano_encoder(probabilities):
+    # Key = probability im Dictionary
+    sorted_probs = sorted(probabilities.items(), key=lambda x: x[1], reverse=True)
+
+    def fano_recursive(symbols):
+        if len(symbols) == 1:  # Keine neuen Teilmengen möglich
+            return {symbols[0][0]: ""}
+
+        total = sum([symbol[1] for symbol in symbols])
+        acc = 0
+        split_index = 0
+        for i in range(len(symbols)):
+            acc += symbols[i][1]
+            if acc >= total / 2:
+                split_index = i
+                break
+
+        left_symbols = symbols[:split_index + 1]
+        right_symbols = symbols[split_index + 1:]
+
+        left_codes = fano_recursive(left_symbols)
+        right_codes = fano_recursive(right_symbols)
+
+        for key in left_codes:
+            left_codes[key] = '0' + left_codes[key]
+        for key in right_codes:
+            right_codes[key] = '1' + right_codes[key]
+
+        left_codes.update(right_codes)
+        return left_codes
+
+    return fano_recursive(sorted_probs)
+
+
+def Q_Fanoencoder(input_path='Text.txt', output_path='EncodedText.txt'):
+    _, probabilities, _, _ = Q_statistik()
+    fano_codes = fano_encoder(probabilities)
+
+    with open(input_path, 'r', encoding='utf-8') as file:
+        text = file.read()
+
+    encoded_text = ''.join([fano_codes[char] for char in text])
+
+    with open(output_path, 'w', encoding='utf-8') as file:
+        file.write(encoded_text)
+
+    return text, encoded_text, fano_codes
+
+
+def calculate_compression_rate(original_text, encoded_text, fano_codes):
+    original_length_bits = len(original_text) * 8
+    encoded_length_bits = len(encoded_text)
+    code_table_bits = sum([len(code) for code in fano_codes.values()]) * 8 + len(fano_codes) * 8
+    total_encoded_bits = encoded_length_bits + code_table_bits
+    compression_rate = (original_length_bits - total_encoded_bits) / original_length_bits * 100
+
+    return original_length_bits, total_encoded_bits, compression_rate
+
+
 def main():
     frequencies, probabilities, information_content, entropy = Q_statistik()
     print("Häufigkeiten:", frequencies)
     print("Wahrscheinlichkeiten:", probabilities)
     print("Informationsgehalt:", information_content)
     print("Entropie:", entropy)
+    original_text, encoded_text, fano_codes = Q_Fanoencoder()
+    original_length_bits, total_encoded_bits, compression_rate = (
+        calculate_compression_rate(original_text, encoded_text, fano_codes)
+    )
+    print(f"Originale Länge in Bits: {original_length_bits}")
+    print(f"Gesamte codierte Länge in Bits (inkl. Codetabelle): {total_encoded_bits}")
+    print(f"Kompressionsrate: {compression_rate:.2f}%")
 
 
 if __name__ == '__main__':

text.txt

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-Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
+Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
-At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
+
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-At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
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