CCITTFaxDecoder: Support for pure one-dimensional encoding (Group 3, 1-D)

maxpmaxp / pdfreader

Python API for PDF documents

MIT License

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Open cdecompilador opened 1 year ago

cdecompilador commented 1 year ago

link to sample pdf The pdf is just a random image scanned from my printer, it fails at filters/ccittfax.py:548

maxpmaxp commented 1 year ago

PDF specification supports 3 types of encoding depending on K value:

K<0 - Pure 2-dimensional encoding (Group 4), which is suported by pdfreader
K=0 - Pure one-dimensional encoding (Group 3, 1-D), - which is in use in this file and not supported at this point
K>0 - Mixed one and two dimensional, not supported.

I treat as a feature request to start supporting pure one dimensional encodings.

maxpmaxp commented 4 months ago

Attaching the sample file as the link in the first comment doesn't work. fax-G31D.pdf