FlateDecode will fail if columns are an IndirectObject #2158
Description
Retrieving the images from a PDF file might fail for the FlateDecode case when decode_parms is something like
{'/Colors': 3, '/Columns': IndirectObject(33, 0, 140029965619504), '/Predictor': 15}
Environment
Which environment were you using when you encountered the problem?
$ python -m platform
Linux-5.14.21-150400.24.81-default-x86_64-with-glibc2.31
$ python -c "import pypdf;print(pypdf._debug_versions)"
pypdf==3.15.5, crypt_provider=('pycryptodome', '3.18.0'), PIL=10.0.0Code + PDF
This is a minimal, complete example that shows the issue:
from pypdf import PdfReader
PATH = 'file.pdf'
for index, page in enumerate(PdfReader(PATH).pages):
print(index, page)
for key in page.images.keys():
print(key)
print(page.images[key].indirect_reference)
page.images[key].image.convert('RGB').save(key[1:] + '.png')Traceback
This is the complete traceback I see:
Traceback (most recent call last):
File "/home/stefan/temp/run.py", line 9, in <module>
print(page.images[key].indirect_reference)
File "/home/stefan/temp/venv/lib/python3.9/site-packages/pypdf/_page.py", line 2637, in __getitem__
return self.get_function(index)
File "/home/stefan/temp/venv/lib/python3.9/site-packages/pypdf/_page.py", line 544, in _get_image
imgd = _xobj_to_image(cast(DictionaryObject, xobjs[id]))
File "/home/stefan/temp/venv/lib/python3.9/site-packages/pypdf/filters.py", line 988, in _xobj_to_image
data = x_object_obj.get_data() # type: ignore
File "/home/stefan/temp/venv/lib/python3.9/site-packages/pypdf/generic/_data_structures.py", line 953, in get_data
decoded.set_data(b_(decode_stream_data(self)))
File "/home/stefan/temp/venv/lib/python3.9/site-packages/pypdf/filters.py", line 696, in decode_stream_data
data = FlateDecode.decode(data, params)
File "/home/stefan/temp/venv/lib/python3.9/site-packages/pypdf/filters.py", line 166, in decode
math.ceil(columns * colors * bits_per_component / 8) + 1
TypeError: unsupported operand type(s) for *: 'IndirectObject' and 'NumberObject'