From 032a0fb21c16d499ca8b7b80547a8d68b1600619 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?F=C3=A9lix=20MARQUET?= <felix.marquet@isen-ouest.yncrea.fr>
Date: Wed, 31 Jan 2024 11:32:00 +0100
Subject: [PATCH] stenographie continue but not end

---
 TP2/main.py              |  22 +++++++-
 TP2/tp_steganographie.py | 106 ++++++++++++++++++++++++++++++++-------
 2 files changed, 109 insertions(+), 19 deletions(-)

diff --git a/TP2/main.py b/TP2/main.py
index 283abab..936a9a5 100644
--- a/TP2/main.py
+++ b/TP2/main.py
@@ -1,7 +1,10 @@
 from tp2 import *
 from tp2_optionnel import *
+from tp_steganographie import *
+
 
 def __main__():
+    '''x
     fond_bleu = Image.new("RGB", (450, 300), (0, 0, 255))
     fond_bleu.show()
     drapeau_fr = creer_drapeau_francais()
@@ -11,7 +14,7 @@ def __main__():
     lena = Image.open("lena.png")
     lena.show()
     print(lena.size)
-    r, g, b = lena.getpixel((0,0))
+    r, g, b = lena.getpixel((0, 0))
     print(r, g, b)
     lena_miror = miroir(lena)
     lena_miror.show()
@@ -26,7 +29,22 @@ def __main__():
     lena_tournee.show()
     lena_contours = contours(lena, 50)
     lena_contours.show()
+    print(getHiddenTextWithDelimiter(hiddenText1, "\0"))
+    print(getHiddenTextWithDelimiter(hiddenText2, "\0"))
+    print(getHiddenTextOfLength(hiddenText3, 4))
+    print(getHiddenTextOfLength(hiddenText4, 16))
+    '''
+    hidden1 = getHiddenImage(hiddenImage1, 8)
+    hidden1.show()
+    hidden2 = getHiddenImage(hiddenImage2, 8)
+    hidden2.show()
+    '''
+    hidden3 = getHiddenImageInLastBits(hiddenImage3, 8, 2)
+    hidden3.show()
+    hidden4 = getHiddenImageInLastBits(hiddenImage4, 16, 2)
+    hidden4.show()
+    '''
 
 
 if __name__ == "__main__":
-    __main__()
\ No newline at end of file
+    __main__()
diff --git a/TP2/tp_steganographie.py b/TP2/tp_steganographie.py
index 9461ea6..ca8174f 100644
--- a/TP2/tp_steganographie.py
+++ b/TP2/tp_steganographie.py
@@ -1,21 +1,93 @@
 from PIL import Image
 
-
-def getHiddenTextWithDelimiter(image, delimiter="\0"):
-    pixel = list(image.getdata())
-    hidden_bits = []
-    for i in range(len(pixel)):
-        hidden_bits.append(str(pixel[i][0] & 1))
-    binary_string = ''.join(hidden_bits)
-    octets = [binary_string[i:i + 8] for i in range(0, len(binary_string), 8)]
-    ascii_characters = ''.join([chr(int(octet, 2)) for octet in octets])
-    hidden_text = ascii_characters.split(delimiter)[0]
-    return hidden_text.split(delimiter)[0]
+hiddenText1 = Image.open("hiddenText1.png")
+hiddenText2 = Image.open("hiddenText2.png")
+hiddenText3 = Image.open("hiddenText3.png")
+hiddenText4 = Image.open("hiddenText4.png")
+hiddenImage1 = Image.open("hiddenImage1.png")
+hiddenImage2 = Image.open("hiddenImage2.png")
+hiddenImage3 = Image.open("hiddenImage3.png")
+hiddenImage4 = Image.open("hiddenImage4.png")
 
 
-print("Image 1")
-image = Image.open('hiddenText1.png')
-print(getHiddenTextWithDelimiter(image))
-print("Image 2")
-image = Image.open('hiddenText2.png')
-print(getHiddenTextWithDelimiter(image))
\ No newline at end of file
+def imageToArray(image):
+    array = []
+    for pixel in image.getdata():
+        array.append(pixel[0])
+        array.append(pixel[1])
+        array.append(pixel[2])
+    return array
+
+
+def getLength(imageArray, nbBitsForLength, index=0):
+    length, i = 0, nbBitsForLength - 1
+    for len in range(index, index + nbBitsForLength):
+        length += imageArray[len] % 2 * (2 ** i)
+        i -= 1
+    return length
+
+
+def getChar(imageArray, index):
+    binN, i = 0, 6
+    for j in range(index, index + 7):
+        binN += (imageArray[j] % 2) * (2 ** i)
+        i -= 1
+    return chr(binN)
+
+
+def getHiddenTextWithDelimiter(image, delimiter):
+    imageArray = imageToArray(image)
+    hiddenText = ""
+    i = 0
+    while getChar(imageArray, i) != delimiter:
+        hiddenText += getChar(imageArray, i)
+        i += 7
+    return hiddenText
+
+
+def getHiddenTextOfLength(image, nbBitsForLength):
+    imageArray = imageToArray(image)
+    hiddenText = ""
+    for i in range(nbBitsForLength, ((getLength(imageArray, nbBitsForLength) * 7) + nbBitsForLength), 7):
+        hiddenText += getChar(imageArray, i)
+    return hiddenText
+
+
+def getLenghtTuple(imageArray, nbBitsForLength, index=0):
+    length = 0, nbBitsForLength - 1
+    i = nbBitsForLength - 1
+    while i >= 0:
+        length += imageArray[index] % 2 * (2 ** i)
+        i -= 1
+        index += 1
+    print(length)
+    return length
+
+
+def imageToArrayTuple(image):
+    array = []
+    for pixel in image.getdata():
+        array.append((pixel[0], pixel[1], pixel[2]))
+    return array
+
+
+def getHiddenImage(image, nbBitsForSize):
+    imageArray = imageToArrayTuple(image)
+    print(imageArray[0:10])
+    width = getLenghtTuple(imageArray, nbBitsForSize)
+    height = getLenghtTuple(imageArray, nbBitsForSize, nbBitsForSize * 2)
+    print(width)
+    print(height)
+    totalPixel = width * height * 3
+    hiddenImagePixel = [imageArray[i:i + 3] for i in range(nbBitsForSize * 2, nbBitsForSize * 2 + totalPixel, 3)]
+    hiddenImagePixel = [value for pixel in hiddenImagePixel for value in pixel]
+    hiddenImagePixel = [(hiddenImagePixel[i], hiddenImagePixel[i + 1], hiddenImagePixel[i + 2]) for i in
+                        range(0, len(hiddenImagePixel), 3)]
+    hiddenImage = Image.new("RGB", (width, height))
+    hiddenImage.putdata(hiddenImagePixel)
+    return hiddenImage
+
+
+def getHiddenImageInLastBits(image, nbBitsForSize, nbLastBits):
+    #To Do
+    return None