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import typing
from kaitaistruct import KaitaiStream
from . import png
Metadata = typing.List[typing.Tuple[str, str]]
def parse_png(data: bytes) -> Metadata:
img = png.Png(KaitaiStream(data))
parts = [tuple(['Format', 'Portable network graphics'])]
parts.append(tuple(['Size', str(img.ihdr.width) + " x " + str(img.ihdr.height) + " px"]))
for chunk in img.chunks:
if chunk.type == 'gAMA':
parts.append(tuple(['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(tuple(['aspect', str(aspectx) + " x " + str(aspecty)]))
elif chunk.type == 'tEXt':
parts.append(tuple([chunk.body.keyword, chunk.body.text]))
return parts
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