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#!/usr/bin/env python
# pripnglsch
# PNG List Chunks
from __future__ import print_function
import argparse
import binascii
import sys
import png
def list_chunks(out, inp):
r = png.Reader(file=inp)
for t, v in r.chunks():
add = ""
if len(v) <= 28:
add = " " + hex(v)
else:
add = " " + hex(v[:26]) + "..."
t = t.decode("ascii")
print("%s %10d%s" % (t, len(v), add), file=out)
def hex(bs):
"""Convert the bytes `bs` to a hex string."""
return binascii.hexlify(bs).decode("ascii")
def main(argv=None):
parser = argparse.ArgumentParser()
parser.add_argument("png", nargs="?", default="-")
args = parser.parse_args()
inp = png.cli_open(args.png)
return list_chunks(sys.stdout, inp)
if __name__ == "__main__":
main()
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