EncodedStreamObject creation is not implemented

[russkel]

https://github.com/claird/PyPDF4/blob/9c60d9df3a56edd32226c9e76695018f997fafe6/pypdf/generic.py#L960-L963

Hi, sorry but I am not familiar with PDF formats whatsoever. Is there a reason this isn't supported yet? Can we just take some bytes, reapply the compression/encoding and be done, or am I missing something?

[russkel]

So I attempted to do what I talked about - noticed the FlateCodec class doesn't exist in the version on pypi, installed from this git repo, and now I get an unknown xref error:

PdfReadError: Unknown xref type: 83

[russkel]

So I needed to use strict=False but now I get this error when trying to getFields():

PdfReadWarning: Object 131072 0 not defined. [pdf.py:2229]

---------------------------------------------------------------------------
PdfReadError                              Traceback (most recent call last)
<ipython-input-12-cd312879d9b2> in <module>
----> 1 pdf.getFields()

~/.local/lib/python3.8/site-packages/pypdf/pdf.py in getFields(self, tree, retval, fileobj)
   1667         if retval is None:
   1668             retval = {}
-> 1669             catalog = self._trailer["/Root"]
   1670 
   1671             # Get the AcroForm tree

~/.local/lib/python3.8/site-packages/pypdf/generic.py in __getitem__(self, key)
    579 
    580     def __getitem__(self, key):
--> 581         return dict.__getitem__(self, key).getObject()
    582 
    583     def getXmpMetadata(self):

~/.local/lib/python3.8/site-packages/pypdf/generic.py in getObject(self)
    199 
    200     def getObject(self):
--> 201         return self.pdf.getObject(self).getObject()
    202 
    203     def __repr__(self):

~/.local/lib/python3.8/site-packages/pypdf/pdf.py in getObject(self, ref)
   2220             return self._cachedObjects[(ref.generation, ref.idnum)]
   2221         if ref.idnum in self._xrefStm:
-> 2222             retval = self._getObjectByRef(ref, self.R_XSTREAM)
   2223         elif (
   2224             ref.generation in self._xrefTable

~/.local/lib/python3.8/site-packages/pypdf/pdf.py in _getObjectByRef(self, ref, source)
   2042                     )
   2043             elif this_type == 2:
-> 2044                 return self._getCompressedObjectFromXRefStream(ref)
   2045             else:
   2046                 # «Any other value shall be interpreted as a reference to the

~/.local/lib/python3.8/site-packages/pypdf/pdf.py in _getCompressedObjectFromXRefStream(self, ref)
   2106 
   2107         # Object streams always have a generation number of 0
-> 2108         objStm = IndirectObject(objStmId, 0, self).getObject()
   2109 
   2110         if objStm["/Type"] != "/ObjStm":

~/.local/lib/python3.8/site-packages/pypdf/generic.py in getObject(self)
    199 
    200     def getObject(self):
--> 201         return self.pdf.getObject(self).getObject()
    202 
    203     def __repr__(self):

~/.local/lib/python3.8/site-packages/pypdf/pdf.py in getObject(self, ref)
   2231                 PdfReadWarning,
   2232             )
-> 2233             raise PdfReadError(
   2234                 "Could not find object (%d, %d)" % (ref.idnum, ref.generation)
   2235             )

PdfReadError: Could not find object (131072, 0)