Tools to work with .cpbitmap files

cpbitmap2image.py

#!/usr/bin/env python2
from PIL import Image
import sys
import struct

def r8(f):
	return ord(f.read(1))

if len(sys.argv) <= 2:
	print("Usage: %s <input> <output>" % sys.argv[0])
else:
	f = open(sys.argv[1], "rb")
	f.seek(-70, 2)
	magic = f.read(8)
	if magic != "bplist00":
		print("Didn't find bplist header, are you sure this is a cpbitmap file?")
		exit(1)
	f.seek(42, 1)
	dat = f.read(6)
	width, height = struct.unpack("<HxxH", dat)
	print("Size: %dx%d" % (width, height))
	img = Image.new("RGBA", (width, height))

	f.seek(0)
	imgd = img.load()
	for y in range(height):
		for x in range(width):
			b, g, r, a = r8(f), r8(f), r8(f), r8(f)
			imgd[x, y] = (r, g, b, a)

	f.close()
	img.save(sys.argv[2])

image2cpbitmap.py

#!/usr/bin/env python2
from PIL import Image
import sys
import struct

def w8(f, v):
	f.write(chr(v))

if len(sys.argv) <= 2:
	print("Usage: %s <input> <output>" % sys.argv[0])
else:
	img = Image.open(sys.argv[1])
	img = img.convert("RGBA")
	f = open(sys.argv[2], "wb")
	width, height = img.size

	imgd = img.load()
	for y in range(height):
		for x in range(width):
			r, g, b, a = imgd[x, y]
			w8(f, b)
			w8(f, g)
			w8(f, r)
			w8(f, a)

	f.write("bplist00\x22\x40" + ("\x00" * 3) + "\x08" + ("\x00" * 6) + "\x01\x01" + ("\x00" * 7) + "\x01" + ("\x00" * 15)
		+ "\x0d\x2e" + ("\x00" * 3) + struct.pack("<HccH", width, "\x00", "\x00", height) + "\x00\x00\x01" + ("\x00" * 3)
		+ "\x01" + ("\x00" * 3) + "\x91\x32\xa4\xcb")
	f.close()

Needed to correct offsets to get it worked with iphone wallpapers, but eventually it works! )

cpbitmap2image.py:

13 f.seek(-74, 2)
18 f.seek(46, 1)

For iOS 12. I changed the code like below.
The reason is on this thread of stack overflow and see the js version. https://stackoverflow.com/questions/7998324/dot-cpbitmap-images-imgaename-cpbitmap

from PIL import Image
import sys
import math
import struct

def r8(f):
    c = ord(f.read(1))
    return c

if len(sys.argv) <= 2:
    print("Usage: %s <input> <output>" % sys.argv[0])
else:
    f = open(sys.argv[1], "rb")
    f.seek(-78, 2)
    magic = f.read(8)
    print magic
    if magic != "bplist00":
        print("Didn't find bplist header, are you sure this is a cpbitmap file?")
        exit(1)
    f.seek(50, 1)
    dat = f.read(6)
    width, height = struct.unpack("<HxxH", dat)
    print("Size: %dx%d" % (width, height))
    img = Image.new("RGBA", (width, height))

    f.seek(0)
    imgd = img.load()

    # Take case of the line size
    line_size = int(math.ceil(width/16.0) * 16)
    print line_size
    for y in range(height):
        for x in range(width):
            b, g, r, a = r8(f), r8(f), r8(f), r8(f)
            imgd[x, y] = (r, g, b, a)
        f.seek((line_size - width)*4, 1)

    f.close()
    img.save(sys.argv[2])