def f5Embed(q):
post, filename = q.get()
jpeg_data = libstegofile.jpeg_data_t()
stego_data = libstegofile.jpeg_data_t()
jpeg_struct = libstegofile.jpeg_internal_data_t()
retcode = libstegofile.io_jpeg_read(filename, jpeg_data, jpeg_struct)
if retcode == 0:
pass
else:
return -1
para = libstegofile.f5_parameter()
message = str(post["message"])
para.password = str(post["pw"])
para.pwlen = len(para.password)
libstego.f5_embed(jpeg_data, stego_data, message, len(message), para)
libstegofile.io_jpeg_integrate(jpeg_struct, stego_data)
libstegofile.io_jpeg_write(filename, jpeg_struct)
q.put(filename)
def embed_or_extract(algorithm, filename, destfilename, message, para, embed):
"""This function gets as parameters
filename ... the input file name
destfilename ... the output filen ame
message ... the message
para ... the parameter for the chosen algorithm
embed ... boolean: if True, we embed, else we extract.
If embed is True it uses libstego to embed the given message
in the given output file, calling the <algorithm>_embed()
function in libstego.
If embed is False, it uses libstego to extract a message
from the given file, calling the <algorithm>_extract()
function in libstego.
This function can therefor be called recursively to check
if embedding a message worked by calling it with embed=False.
"""
ending = filename[-3:]
print ending
if embed:
msglen = len(message) + 1
else:
message = libstego.new_charp()
msglen = libstego.new_intp()
if ending == "gif":
src_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
libstegofile.io_gif_read(filename, src_data, gif_int)
if algorithm == "Sort / Unsort":
if embed:
libstego.sortunsort_embed(src_data, stego_data, message, msglen, para)
else:
libstego.sortunsort_extract(src_data, message, msglen, para)
elif algorithm == "GifShuffle":
if embed:
if para.method == 1:
pw_message = para.password
pw_message_len = para.pwlen
para.password = ""
para.pwlen = 0
pwmsg_data = libstegofile.palette_data_t()
para.method = 0
libstego.gifshuffle_embed(src_data, pwmsg_data, pw_message, pw_message_len, para)
para.method = 1
libstego.gifshuffle_embed(pwmsg_data, stego_data, message, msglen, para)
else:
print "normal gifshuffle:"
print "pw: " + para.password
print "pwlen: " + str(para.pwlen)
libstego.gifshuffle_embed(src_data, stego_data, message, msglen, para)
else:
if para.method == 1:
pw_message = para.password
pw_message_len = para.pwlen
para.password = ""
para.pwlen = 0
pwmsg_data = libstegofile.palette_data_t()
para.method = 0
libstego.gifshuffle_embed(src_data, pwmsg_data, pw_message, pw_message_len, para)
para.adv_pal = pwmsg_data
para.method = 1
libstego.gifshuffle_extract(src_data, message, msglen, para)
else:
libstego.gifshuffle_extract(src_data, message, msglen, para)
elif algorithm == "Frirui":
if embed:
libstego.frirui_embed(src_data, stego_data, message, msglen, para)
else:
libstego.frirui_extract(src_data, message, msglen, para)
if embed:
print "integrate and write ..."
libstegofile.io_gif_integrate(gif_int, stego_data)
libstegofile.io_gif_write(destfilename, gif_int)
# libstegofile.io_gif_cleanup_data(stego_data)
# libstegofile.io_gif_cleanup_data(src_data)
# libstegofile.io_gif_cleanup_internal(gif_int)
elif ending == "png":
src_data = libstegofile.rgb_data_t()
stego_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
libstegofile.io_png_read(filename, src_data, png_int)
if algorithm == "Battlesteg":
if embed:
libstego.battlesteg_embed(src_data, stego_data, message, msglen, para)
else:
libstego.battlesteg_extract(src_data, message, msglen, para)
elif algorithm == "CPT":
if embed:
libstego.cpt_embed(src_data, stego_data, message, msglen, para)
else:
libstego.cpt_extract(src_data, message, msglen, para)
elif algorithm == "LSB":
bytes = libstego.new_charpp()
num_bytes = libstego.new_intp()
stego_data = src_data
libstego.lsb_convert_png(stego_data, bytes, num_bytes)
if embed:
ret = libstego.lsb_embed_indirect(
libstego.charpp_value(bytes), libstego.intp_value(num_bytes), message, msglen, para
)
if ret != 0:
print "An error occured. Error code: " + ` libstego.cvar.lstg_errno `
return False
else:
ret = libstego.lsb_extract_indirect(
libstego.charpp_value(bytes), libstego.intp_value(num_bytes), message, msglen, para
)
if ret != 0:
print "An error occured. Error code: " + ` libstego.cvar.lstg_errno `
return False
libstego.lsb_cleanup_converted_data(libstego.charpp_value(bytes))
libstego.delete_charpp(bytes)
if embed:
libstegofile.io_png_integrate(png_int, stego_data)
libstegofile.io_png_write(destfilename, png_int)
libstegofile.io_png_cleanup_data(stego_data)
# png cleanup ruft segmentation faults hervor...
# libstegofile.io_png_cleanup_data(src_data)
# libstegofile.io_png_cleanup_internal(png_int)
elif ending == "svg":
src_data = libstegofile.svg_data_t()
stego_data = libstegofile.svg_data_t()
svg_int = libstegofile.svg_internal_data_t()
libstegofile.io_svg_read(filename, src_data, svg_int)
if algorithm == "SVG Steg":
if embed:
ret = libstego.svg_embed(src_data, stego_data, message, msglen, para)
if ret != 0:
print "An error occured. Error code: " + ` libstego.cvar.lstg_errno `
return False
else:
ret = libstego.svg_extract(src_data, message, msglen, para)
if ret != 0:
print "An error occured. Error code: " + ` libstego.cvar.lstg_errno `
return False
if embed:
libstegofile.io_svg_integrate(svg_int, stego_data)
libstegofile.io_svg_write(destfilename, svg_int)
libstegofile.io_svg_cleanup_data(stego_data)
libstegofile.io_svg_cleanup_data(src_data)
libstegofile.io_svg_cleanup_internal(svg_int)
elif ending == "wav":
src_data = libstegofile.wav_data_t()
stego_data = libstegofile.wav_data_t()
wav_int = libstegofile.wav_internal_data_t()
libstegofile.io_wav_read(filename, src_data, svg_int)
if algorithm == "Echo Hiding":
if embed:
libstego.echohiding_embed(src_data, stego_data, message, msglen, para)
else:
libstego.echohiding_extract(src_data, message, msglen, para)
elif algorithm == "Phase Coding":
if embed:
libstego.phasecoding_embed(src_data, stego_data, message, msglen, para)
else:
libstego.phasecoding_extract(src_data, message, msglen, para)
libstegofile.io_wav_integrate(wav_int, stego_data)
libstegofile.io_wav_write(destfilename, wav_int)
libstegofile.io_wav_cleanup_data(stego_data)
libstegofile.io_wav_cleanup_data(src_data)
libstegofile.io_wav_cleanup_internal(wav_int)
elif ending == "jpg" or "peg":
src_data = libstegofile.jpeg_data_t()
stego_data = libstegofile.jpeg_data_t()
jpg_int = libstegofile.jpeg_internal_data_t()
libstegofile.io_jpeg_read(filename, src_data, jpg_int)
if algorithm == "F5":
if embed:
libstego.f5_embed(src_data, stego_data, message, msglen, para)
else:
libstego.f5_extract(src_data, message, msglen, para)
elif algorithm == "MB2":
if embed:
libstego.mb2_embed(src_data, stego_data, message, msglen, para)
else:
libstego.mb2_extract(src_data, message, msglen, para)
libstegofile.io_jpeg_integrate(jpg_int, stego_data)
libstegofile.io_jpeg_write(destfilename, jpg_int)
# libstegofile.io_jpeg_cleanup_data(stego_data)
libstegofile.io_jpeg_cleanup_data(src_data)
libstegofile.io_jpeg_cleanup_internal(jpg_int)
# TODO: extract for testing purpose!
if embed:
return True
else:
new_message = str(libstego.charp_value(message))
length = libstego.intp_value(msglen)
print new_message
return new_message
def embed_or_extract_with_method(embed, method, filename, destfilename, message, msglen):
if embed:
print "embedding with method " + `method+1` + ", algo: " + method_to_algo[method]
else:
p_message = libstego.new_charp()
p_msglen = libstego.new_intp()
print "extracting with method " + `method+1` + ", algo: " + method_to_algo[method]
if method_to_algo[method] == "PQ":
# prepare data strucures
jpeg_data = libstegofile.jpeg_data_t()
stego_data = libstegofile.jpeg_data_t()
jpeg_int = libstegofile.jpeg_internal_data_t()
# read file data
err = libstegofile.io_jpeg_read(filename, jpeg_data, jpeg_int)
if err != 0:
# TODO better error handling
print "Error while reading JPG"
return
para = methods[method]
if embed:
err = libstego.pq_embed(jpeg_data, stego_data, message, len(message) + 1, para)
if err == 0:
err = libstegofile.io_jpeg_integrate(jpeg_int, stego_data)
if err != 0:
print "Error while integrating JPEG"
err = libstegofile.io_jpeg_write(destfilename, jpeg_int)
if err != 0:
print "Error while writing JPEG"
else:
print "An error occured while embedding with PQ."
else:
err = libstego.pq_extract(jpeg_data, p_message, p_msglen, para)
if err != 0:
print "An error occured while extracting with PQ."
# cleanup
libstegofile.io_jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_data(stego_data)
libstegofile.io_jpeg_cleanup_internal_data(jpeg_int)
elif method_to_algo[method] == "F5":
# prepare data strucures
jpeg_data = libstegofile.jpeg_data_t()
stego_data = libstegofile.jpeg_data_t()
jpeg_int = libstegofile.jpeg_internal_data_t()
# read file data
err = libstegofile.io_jpeg_read(filename, jpeg_data, jpeg_int)
if err != 0:
# TODO better error handling
print "Error while reading JPG"
return
para = methods[method]
if embed:
err = libstego.f5_embed(jpeg_data, stego_data, message, len(message) + 1, para)
if err == 0:
err = libstegofile.io_jpeg_integrate(jpg_int, stego_data)
err = libstegofile.io_jpeg_write(destfilename, jpeg_int)
else:
print "Error while embedding with F5."
else:
err = libstego.f5_extract(jpeg_data, p_message, p_msglen, para)
if err != 0:
print "Error while extracting with F5."
# cleanup
libstegofile.jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_data(stego_data)
libstegofile.io_jpeg_cleanup_internal_data(jpeg_int)
elif method_to_algo[method] == "Adv. Gifshuffle":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling
print "Error while reading GIF"
return
para = methods[method]
if embed:
pw_message = para.password
pw_message_len = para.pwlen
para.password = ""
para.pwlen = 0
pwmsg_data = libstegofile.palette_data_t()
para.method = 0
err = libstego.gifshuffle_embed(palette_data, pwmsg_data, pw_message,
pw_message_len, para)
para.method = 1
err = libstego.gifshuffle_embed(pwmsg_data, stego_data,
message, msglen, para)
err = libstegofile.io_gif_integrate(gif_int, stego_data)
err = libstegofile.io_gif_write(destfilename, gif_int)
else:
pw_message = para.password
pw_message_len = para.pwlen
para.password = ""
para.pwlen = 0
pwmsg_data = libstegofile.palette_data_t()
para.method = 0
err = libstego.gifshuffle_embed(palette_data, pwmsg_data, pw_message,
pw_message_len, para)
para.adv_pal = pwmsg_data
para.method = 1
err = libstego.gifshuffle_extract(palette_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_gif_cleanup_data(stego_data)
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "Gifshuffle":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling
print "Error while reading GIF"
return
para = methods[method]
if embed:
err = libstego.gifshuffle_embed(palette_data, stego_data, message, msglen, para)
err = libstegofile.io_gif_integrate(gif_int, stego_data)
err = libstegofile.io_gif_write(destfilename, gif_int)
else:
err = libstego.gifshuffle_extract(palette_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_gif_cleanup_data(stego_data)
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "Frirui":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling
print "Error while reading GIF"
return
para = methods[method]
if embed:
err = libstego.frirui_embed(palette_data, stego_data, message, msglen, para)
err = libstegofile.io_gif_integrate(gif_int, stego_data)
err = libstegofile.io_gif_write(destfilename, gif_int)
else:
err = libstego.frirui_extract(palette_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_gif_cleanup_data(stego_data)
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "Sort/Unsort":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling
print "Error while reading GIF"
return
para = methods[method]
if embed:
libstego.sortunsort_embed(palette_data, stego_data, message, msglen, para)
err = libstegofile.io_gif_integrate(gif_int, stego_data)
err = libstegofile.io_gif_write(destfilename, gif_int)
else:
libstego.sortunsort_extract(palette_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_gif_cleanup_data(stego_data)
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "CPT":
# prepare data strucures
rgb_data = libstegofile.rgb_data_t()
stego_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
# read file data
err = libstegofile.io_png_read(filename, rgb_data, png_int)
if err != 0:
# TODO better error handling
print "Error while reading PNG"
return
para = methods[method]
if embed:
print(para.password)
print(para.pwlen)
print(para.block_width)
print(para.block_height)
err = libstego.cpt_embed(rgb_data, stego_data, message, msglen, para)
if err == 0:
err = libstegofile.io_png_integrate(png_int, stego_data)
err = libstegofile.io_png_write(destfilename, png_int)
else:
err = libstego.cpt_extract(rgb_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_png_cleanup_data(rgb_data)
libstegofile.io_png_cleanup_data(stego_data)
libstegofile.io_png_cleanup_internal(png_int)
elif method_to_algo[method] == "Battlesteg":
# prepare data strucures
rgb_data = libstegofile.rgb_data_t()
stego_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
# read file data
err = libstegofile.io_png_read(filename, rgb_data, png_int)
if err != 0:
# TODO better error handling
print "Error while reading PNG"
return
para = methods[method]
if embed:
err = libstego.battlesteg_embed(rgb_data, stego_data, message, msglen, para)
if err == 0:
err = libstegofile.io_png_integrate(png_int, stego_data)
err = libstegofile.io_png_write(destfilename, png_int)
else:
err = libstego.battlesteg_extract(rgb_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_png_cleanup_data(rgb_data)
libstegofile.io_png_cleanup_data(stego_data)
libstegofile.io_png_cleanup_internal(png_int)
elif method_to_algo[method] == "SVG Steg":
# prepare data strucures
svg_data = libstegofile.svg_data_t()
svg_stego = libstegofile.svg_data_t()
svg_int = libstegofile.svg_internal_data_t()
# read file data
err = libstegofile.io_svg_read(filename, svg_data, svg_int)
if err != 0:
# TODO better error handling
print "Error while reading SVG"
return
para = methods[method]
if embed:
err = libstego.svg_embed(svg_data, stego_data, message, msglen, para)
if err == 0:
err = libstegofile.io_svg_integrate(svg_int, stego_data)
if err != 0:
print "Error while integrating SVG"
err = libstegofile.io_svg_write(destfilename, svg_int)
if err != 0:
print "Error while writing SVG"
else:
print "Error while embedding with SVG Stego"
else:
err = libstego.svg_extract(svg_data, p_message, p_msglen, para)
if err != 0:
print "Error while extracting with SVG Stego"
# cleanup
libstegofile.svg_cleanup_data(svg_data)
libstegofile.svg_cleanup_data(stego_data)
libstegofile.svg_cleanup_internal(svg_int)
elif method_to_algo[method] == "Echo Hiding":
# prepare data strucures
wav_data = libstegofile.wav_data_t()
stego_data = libstegofile.wav_data_t()
wav_int = libstegofile.wav_internal_data_t()
# read file data
err = libstegofile.io_wav_read(filename, wav_data, wav_int)
if err != 0:
# TODO better error handling
print "Error while reading WAV"
return
para = methods[method]
if embed:
err = libstego.eh_embed(wav_data, stego_data, message, msglen, para)
if err == 0:
err = libstegofile.io_wav_integrate(wav_int, stego_data)
if err != 0:
print "Error while integrating WAV"
err = libstegofile.io_wav_write(destfilename, wav_int)
if err != 0:
print "Error while writing WAV"
else:
print "Error while embedding with Echo Hiding"
else:
err = libstego.eh_extract(wav_data, p_message, p_msglen, para)
if err != 0:
print "Error while extracting with Echo Hiding"
# cleanup
libstegofile.wav_cleanup_data(wav_data)
libstegofile.wav_cleanup_data(stego_data)
libstegofile.wav_cleanup_internal(wav_int)
elif method_to_algo[method] == "Phase Coding":
# TODO implement
pass
elif method_to_algo[method] == "LSB":
# TODO implement
pass
if embed:
return None
else:
message = str(libstego.charp_value(p_message))
print message
msglen = libstego.intp_value(p_msglen)
return message
def embed_or_extract(algo, para, filename, destfilename):
#TODO: File read + Cleanup + implement for earch algo + parameter sets!
#TODO: Return (None) or Return Error
#TODO: After embed call function recursively to call extract (verify msg)
#TODO: Lots of "returns"
if filename.endswith("jpeg") or filename.endswith("jpg"):
src_data = libstegofile.jpeg_data_t()
jpg_int = libstegofile.jpeg_internal_data_t()
libstegofile.io_jpeg_read(filename, src_data, jpg_int)
if algo == "PQ":
if embed:
stego_data = libstegofile.jpeg_data_t()
err = libstego.pq_embed(src_data, stego_data, message, len(message) + 1, para)
if err == 0:
libstegofile.io_jpeg_integrate(jpg_int, stego_data)
libstegofile.io_jpeg_write(destfilename, jpg_int)
libstegofile.io_jpeg_cleanup_data(stego_data)
else:
err = libstego.pq_extract(src_data, message, msglen, para)
elif algo == "F5":
if embed:
stego_data = libstegofile.jpeg_data_t()
err = libstego.f5_embed(src_data, stego_data, message, len(message) + 1, para)
if err == 0:
libstegofile.io_jpeg_integrate(jpg_int, stego_data)
libstegofile.io_jpeg_write(destfilename, jpg_int)
libstegofile.io_jpeg_cleanup_data(stego_data)
else:
err = libstego.f5_extract(src_data, message, msglen, para)
"""elif algo == "LSB":
if embed:
stego_data = libstegofile.jpeg_data_t()
err = libstego.lsb_embed(src_data, stego_data, message, len(message) + 1, para)
if err == 0:
libstegofile.io_jpeg_integrate(jpg_int, stego_data)
libstegofile.io_jpeg_write(destfilename, jpg_int)
libstegofile.io_jpeg_cleanup_data(stego_data)
else:
err = libstego.lsb_extract(src_data, message, msglen, para)"""
libstegofile.io_jpeg_cleanup_data(src_data)
libstegofile.io_jpeg_cleanup_internal(jpg_int)
return err
elif filename.endswith("gif"):
src_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
libstegofile.io_gif_read(filename, src_data, gif_int)
if algo == "Adv. Gifshuffle":
if embed:
pw_message = para.password
pw_message_len = para.pwlen
para.password = ""
para.pwlen = 0
pwmsg_data = libstegofile.palette_data_t()
para.method = 0
libstego.gifshuffle_embed(src_data, pwmsg_data, pw_message,
pw_message_len, para)
para.method = 1
libstego.gifshuffle_embed(pwmsg_data, stego_data,
message, msglen, para)
else:
pw_message = para.password
pw_message_len = para.pwlen
para.password = ""
para.pwlen = 0
pwmsg_data = libstegofile.palette_data_t()
para.method = 0
libstego.gifshuffle_embed(src_data, pwmsg_data, pw_message,
pw_message_len, para)
para.adv_pal = pwmsg_data
para.method = 1
libstego.gifshuffle_extract(src_data, message,
msglen, para)
elif algo == "Gifshuffle":
if embed:
libstego.gifshuffle_embed(src_data, stego_data, message,
msglen, para)
else:
libstego.gifshuffle_extract(src_data, message,
msglen, para)
elif algo == "Sort/Unsort":
if embed:
libstego.sortunsort_embed(src_data, stego_data, message,
msglen, para)
else:
libstego.sortunsort_extract(src_data, message,
msglen, para)
elif algo == "Frirui":
if embed:
libstego.frirui_embed(src_data, stego_data, message,
msglen, para)
else:
libstego.frirui_extract(src_data, message,
msglen, para)
elif algo == "LSB":
if embed:
#embed
pass
else:
#extract
pass
# Write back and clean up
libstegofile.io_gif_integrate(gif_int, stego_data)
libstegofile.io_gif_write(destfilename, gif_int)
libstegofile.io_gif_cleanup_data(stego_data)
libstegofile.io_gif_cleanup_data(src_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif filename.endswith("png"):
src_data, stego_data, png_int = call_file_read(libstegofile.rgb_data_t,
libstegofile.png_internal_data_t,
libstegofile.io_png_read)
if algo == "CPT":
call_embed_extract(embed, libstego.cpt_embed, libstego.cpt_extract,
src_data, stego_data, message, msglen, para)
elif algo == "Battlesteg":
call_embed_extract(embed, libstego.battlesteg_embed, libstego.battlesteg_extract,
src_data, stego_data, message, msglen, para)
elif algo == "LSB":
call_embed_extract(embed, libstego.lsb_embed, libstego.lsb_extract,
src_data, stego_data, message, msglen, para)
libstegofile.io_png_integrate(png_int, stego_data)
libstegofile.io_png_write(destfilename, png_int)
libstegofile.io_png_cleanup_data(stego_data)
libstegofile.io_png_cleanup_data(src_data)
libstegofile.io_png_cleanup_internal(png_int)
elif filename.endswith("wav"):
if algo == "Echo Hiding":
if embed:
#embed
pass
else:
#extract
pass
elif algo == "Phase Coding":
if embed:
#embed
pass
else:
#extract
pass
elif algo == "LSB":
if embed:
#embed
pass
else:
#extract
pass
elif filename.endswith("svg"):
if algo == "SVG Steg":
if embed:
#embed
pass
else:
#extract
pass
elif algo == "LSB":
if embed:
#embed
pass
else:
#extract
pass