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"""Encode png image via command-line.
Usage:
main (-e|encode) <originImage> [<text>] [<encoded_image>]
main (-d|decode) <encoded_image>
Options:
-h,--help 显示帮助菜单
-e 加密
-d 解密
Example:
main -e coffee.png hello textOrFileToEncode encoded_image.png
main -d encoded_image.png
"""
from PIL import Image
from docopt import docopt
def rgba_make_image_even(image):
pixels = list(image.getdata())
even_pixels = [(r >> 1 << 1, g >> 1 << 1, b >> 1 << 1, t >> 1 << 1) for [r, g, b, t] in pixels]
even_image = Image.new(image.mode, image.size)
even_image.putdata(even_pixels)
return even_image
def rgb_make_image_even(image):
pixels = list(image.getdata())
even_pixels = [(r >> 1 << 1, g >> 1 << 1, b >> 1 << 1) for [r, g, b] in pixels]
even_image = Image.new(image.mode, image.size)
even_image.putdata(even_pixels)
return even_image
def const_len_bin(arg):
binary = "0" * (8 - (len(bin(arg)) - 2)) + bin(arg).replace('0b', '')
return binary
def rgba_encode_data_in_image(image, data):
even_image = rgba_make_image_even(image)
binary = ''.join(map(const_len_bin, bytearray(data, 'utf-8')))
if len(binary) > len(image.getdata()) * 4:
raise Exception(f"Error: Can't encode more than {len(even_image.getdata()) * 4} bits in this image. ")
encoded_pixels = [(r + int(binary[index * 4 + 0]), g + int(binary[index * 4 + 1]), b + int(binary[index * 4 + 2]), t + int(binary[index * 4 + 3])) if index * 4 < len(binary) else (r, g, b, t) for index, (r, g, b, t) in enumerate(list(even_image.getdata()))]
encoded_image = Image.new(even_image.mode, even_image.size)
encoded_image.putdata(encoded_pixels)
return encoded_image
def rgb_encode_data_in_image(image, data):
even_image = rgb_make_image_even(image)
binary = ''.join(map(const_len_bin, bytearray(data, 'utf-8')))
if len(binary) % 3 != 0:
rema = len(binary) % 3
binary = binary + ('0' * (3 - rema))
if len(binary) > len(image.getdata()) * 3:
raise Exception(f"Error: Can't encode more than {len(even_image.getdata()) * 3} bits in this image. ")
encoded_pixels = [(r + int(binary[index * 3 + 0]), g + int(binary[index * 3 + 1]), b + int(binary[index * 3 + 2])) if index * 3 < len(binary) else (r, g, b) for index, (r, g, b) in enumerate(list(even_image.getdata()))]
encoded_image = Image.new(even_image.mode, even_image.size)
encoded_image.putdata(encoded_pixels)
return encoded_image
def binary_to_string(binary):
index = 0
string = []
rec = lambda x, i: x[2:8] + (rec(x[8:], i - 1) if i > 1 else '') if x else ''
fun = lambda x, i: x[i + 1:8] + rec(x[8:], i - 1)
while index + 1 < len(binary):
char_type = binary[index:].index('0')
length = char_type * 8 if char_type else 8
string.append(chr(int(fun(binary[index:index + length], char_type), 2)))
index += length
return ''.join(string)
def rgba_decode_image(image):
pixels = list(image.getdata())
binary = ''.join([str(int(r >> 1 << 1 != r)) + str(int(g >> 1 << 1 != g)) + str(int(b >> 1 << 1 != b)) + str(int(t >> 1 << 1 != t)) for (r, g, b, t) in pixels])
location_double_null = binary.find('0000000000000000')
end_index = location_double_null + (
8 - (location_double_null % 8)) if location_double_null % 8 != 0 else location_double_null
data = binary_to_string(binary[0:end_index])
return data
def rgb_decode_image(image):
pixels = list(image.getdata())
binary = ''.join([str(int(r >> 1 << 1 != r)) + str(int(g >> 1 << 1 != g)) + str(int(b >> 1 << 1 != b)) for (r, g, b) in pixels])
location_double_null = binary.find('0000000000000000')
end_index = location_double_null + (8 - (location_double_null % 8)) if location_double_null % 8 != 0 else location_double_null
data = binary_to_string(binary[0:end_index])
return data
def is_text_file(path):
if path.endswith(".txt"):
return True
elif path.endswith(".m"):
return True
elif path.endswith(".h"):
return True
elif path.endswith(".c"):
return True
elif path.endswith(".py"):
return True
else:
return False
if __name__ == '__main__':
"""command-line interface"""
arguments = docopt(__doc__)
if arguments['-e'] or arguments['encode']:
if arguments['<text>'] is None:
arguments['<text>'] = "待加密的文本"
if arguments['<encoded_image>'] is None:
arguments['<encoded_image>'] = "encoded_image.png"
if is_text_file(arguments['<text>']):
with open(arguments['<text>'], 'rt') as f:
arguments['<text>'] = f.read()
print("载体图片:")
print(arguments['<originImage>'] + "\n")
print("待加密密文:")
print(arguments['<text>'] + "\n")
print("加密后图片:")
print(arguments['<encoded_image>'] + "\n")
print("加密中……\n")
im = Image.open(arguments['<originImage>'])
if im.mode == 'RGBA':
rgba_encode_data_in_image(im, arguments['<text>']).save(arguments['<encoded_image>'])
else:
print("暂不支持此图片格式……")
print("加密完成,密文为：\n" + arguments['<text>'] + "\n")
elif arguments['-d'] or arguments['decode']:
print("解密中……\n")
im = Image.open(arguments['<encoded_image>'])
if im.mode == 'RGBA':
print("解秘完成，密文为：\n" + rgba_decode_image(im) + "\n")
else:
print("非法的图片格式……")
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