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Closes #4.

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Cédric Bonhomme 2016-05-21 16:53:43 +02:00
parent eeb8132b4b
commit 6cd22dfe72
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2 changed files with 11 additions and 8 deletions
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12
stegano/lsb/lsb.py
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@ -55,18 +55,17 @@ def hide(input_image_file, message, auto_convert_rgb=False):
index = 0 index = 0
message = str(len(message)) + ":" + str(message) message = str(len(message)) + ":" + str(message)
#message_bits = tools.a2bits(message)
message_bits = "".join(tools.a2bits_list(message)) message_bits = "".join(tools.a2bits_list(message))
message_bits += '0' * ((3 - (len(message_bits) % 3)) % 3) message_bits += '0' * ((3 - (len(message_bits) % 3)) % 3)
npixels = width * height npixels = width * height
if len(message_bits) > npixels * 3: len_message_bits = len(message_bits)
if len_message_bits > npixels * 3:
raise Exception("""The message you want to hide is too long (%s > %s).""" % (len(message_bits), npixels * 3)) raise Exception("""The message you want to hide is too long (%s > %s).""" % (len(message_bits), npixels * 3))
for row in range(height): for row in range(height):
for col in range(width): for col in range(width):
if index + 3 <= len_message_bits :
if index + 3 <= len(message_bits) :
# Get the colour component. # Get the colour component.
(r, g, b) = img.getpixel((col, row)) (r, g, b) = img.getpixel((col, row))
@ -79,7 +78,10 @@ def hide(input_image_file, message, auto_convert_rgb=False):
# Save the new pixel # Save the new pixel
encoded.putpixel((col, row), (r, g , b)) encoded.putpixel((col, row), (r, g , b))
index += 3 index += 3
else:
img.close()
return encoded
img.close() img.close()
return encoded return encoded

7
stegano/lsbset/lsbset.py
View file

@ -62,12 +62,13 @@ def hide(input_image_file, message, generator_function, auto_convert_rgb=False):
message_bits += '0' * ((3 - (len(message_bits) % 3)) % 3) message_bits += '0' * ((3 - (len(message_bits) % 3)) % 3)
npixels = width * height npixels = width * height
if len(message_bits) > npixels * 3: len_message_bits = len(message_bits)
raise Exception("""The message you want to hide is too long (%s > %s).""" % (len(message_bits), npixels * 3)) if len_message_bits > npixels * 3:
raise Exception("""The message you want to hide is too long (%s > %s).""" % (len_message_bits, npixels * 3))
generator = getattr(generators, generator_function)() generator = getattr(generators, generator_function)()
while index + 3 <= len(message_bits) : while index + 3 <= len_message_bits :
generated_number = next(generator) generated_number = next(generator)
(r, g, b) = img_list[generated_number] (r, g, b) = img_list[generated_number]