mirror of https://github.com/dirtbags/moth.git
81 lines
2.1 KiB
Plaintext
81 lines
2.1 KiB
Plaintext
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#! /usr/bin/python
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## Fetch some public domain images, make a PNG of the key, and encode
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## that in the Exif.Image.OriginalRawFileData tags of the images
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import os
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import glob
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import random
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import shutil
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import md5
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import sys
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import zipfile
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key = 'wilderness fishsticks'
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srcdir = os.path.dirname(sys.argv[0])
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exifblah = os.path.join(srcdir, 'image.cmds')
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def system(cmd):
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ret = os.system(cmd)
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if ret:
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raise OSError('return value %d: %s' % (ret, cmd))
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# Download war posters
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if not os.path.exists('ww0207-43.jpg'):
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system('wget -r -D digital.library.northwestern.edu -A jpg -nd -l 2 "http://digital.library.northwestern.edu/otcgi/digilib/llscgi60.exe?mode=phrase&query=conserve®ION=&SIZE=20&db=0"')
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os.unlink('robots.txt')
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# Store the key
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open('key', 'w').write(key)
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# Make a PNG of it
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f = os.popen('pbmtext < key | pnmtopng -compression 0')
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key_png = f.read()
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# Duplicate two photos
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jpegs = glob.glob('*.jpg')
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random.shuffle(jpegs)
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for fn in jpegs[:2]:
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root, ext = os.path.splitext(fn)
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nfn = '%s.dup%s' % (root, ext)
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shutil.copy(fn, nfn)
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jpegs.append(nfn)
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random.shuffle(jpegs)
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bytes_per_photo = len(key_png) / len(jpegs)
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zipf = zipfile.ZipFile('archive.zip', 'w')
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for i in range(len(jpegs)):
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fn = jpegs[i]
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cmd1 = 'set Exif.Canon.0x0019 %d' % i
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offset = i * bytes_per_photo
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if i == len(jpegs) - 1:
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bytes = key_png[offset:]
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else:
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bytes = key_png[offset:offset + bytes_per_photo]
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bytes_str = ' '.join(str(ord(c)) for c in bytes)
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cmd2 = 'set Exif.Canon.0x0018 "%s"' % bytes_str
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# First set some defaults
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system('exiv2 -m %s %s' % (exifblah, fn))
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# Now apply our devious stuff
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system('exiv2 -M\'%s\' -M\'%s\' %s' % (cmd1, cmd2, fn))
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# Read it in
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contents = open(fn, 'rb').read()
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# Find the new file's md5 checksum
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checksum = md5.new(contents).hexdigest()
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# Make a new zip file entry
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zi = zipfile.ZipInfo(checksum + '.jpg')
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zi.compress_type = zipfile.ZIP_DEFLATED
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zi.external_attr = 0644 << 16L
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zipf.writestr(zi, contents)
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# We're done with this file
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os.unlink(fn)
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