Python make Examples

Example #1

File: png-examples.py Project: liuwanjie/corkami

import sys, zlib, os
from Crypto.Cipher import AES
import png

with open("logo11w.png", "rb") as f:
    c = png.read(f)

# a PNG with appended data
contents = png.make(c) + os.urandom(64 * 1024)
with open("appendeddata.png", "wb") as f:
    f.write(contents)

# a PNG with a standard text chunk
c1 = list(c)
c1.insert(1, ["tEXt", "sans commentaire!"])

with open("text-chunk.png", "wb") as f:
    f.write(png.make(c1))

# a PNG with a custom chunk
c2 = list(c)
c2.insert(1, ["bing", "extra chunk"])

with open("custom-chunk.png", "wb") as f:
    f.write(png.make(c2))

# a PNG with a custom chunk FIRST
c2 = list(c)
c2.insert(0, ["brin", "Do no evil, Sergey ;)"])

with open("custom-first.png", "wb") as f:

Example #2

File: png_app_data.py Project: liuwanjie/corkami

# appends data at PNG format level

import sys, png, os

fn = sys.argv[1]

with open(fn, "rb") as f:
    chunks = png.read(f)

for chunk in chunks:
    if chunk[0] == "IDAT":
        chunk[1] += os.urandom(1024 * 1024)

with open("app_%s" % fn, "wb") as f:
    f.write(png.make(chunks))

Example #3

File: png_app_data.py Project: NicholasFengTW/corkami-1

#appends data at PNG format level

import sys, png, os

fn = sys.argv[1]

with open(fn, "rb") as f:
    chunks = png.read(f)

for chunk in chunks:
    if chunk[0] == "IDAT":
        chunk[1] += os.urandom(1024 * 1024)

with open("app_%s" % fn, "wb") as f:
    f.write(png.make(chunks))

Example #4

import sys, zlib, os
from Crypto.Cipher import AES
import png

with open("logo11w.png", "rb") as f:
    c = png.read(f)

#a PNG with appended data
contents = png.make(c) + os.urandom(64 * 1024)
with open("appendeddata.png", "wb") as f:
    f.write(contents)

#a PNG with a standard text chunk
c1 = list(c)
c1.insert(1, ["tEXt", "sans commentaire!"])

with open("text-chunk.png", "wb") as f:
    f.write(png.make(c1))

#a PNG with a custom chunk
c2 = list(c)
c2.insert(1, ["bing", "extra chunk"])

with open("custom-chunk.png", "wb") as f:
    f.write(png.make(c2))

#a PNG with a custom chunk FIRST
c2 = list(c)
c2.insert(0, ["brin", "Do no evil, Sergey ;)"])

with open("custom-first.png", "wb") as f: