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import io
import typing
from kaitaistruct import KaitaiStream
from mitmproxy.contrib.kaitaistruct import png
Metadata = typing.List[typing.Tuple[str, str]]
def parse_png(data: bytes) -> Metadata:
img = png.Png(KaitaiStream(io.BytesIO(data)))
parts = [
('Format', 'Portable network graphics')
]
parts.append(('Size', "{0} x {1} px".format(img.ihdr.width, img.ihdr.height)))
for chunk in img.chunks:
if chunk.type == 'gAMA':
parts.append(('gamma', str(chunk.body.gamma_int / 100000)))
elif chunk.type == 'pHYs':
aspectx = chunk.body.pixels_per_unit_x
aspecty = chunk.body.pixels_per_unit_y
parts.append(('aspect', "{0} x {1}".format(aspectx, aspecty)))
elif chunk.type == 'tEXt':
parts.append((chunk.body.keyword, chunk.body.text))
elif chunk.type == 'iTXt':
parts.append((chunk.body.keyword, chunk.body.text))
elif chunk.type == 'zTXt':
parts.append((chunk.body.keyword, chunk.body.text_datastream.decode('iso8859-1')))
return parts
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