bugunrtf - Bugs: bug #64593, Embedded PNG images with only...


bug #64593: Embedded PNG images with only \picwgoalN and \pichgoalN extracts to empty output PNG

Submitter:  None
Submitted:  Thu 24 Aug 2023 09:58:18 PM UTC
Category:  None Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  None Privacy:  Public
Assigned to:  None Originator Email:  -email is unavailable-
Open/Closed:  Open Release:  None
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Thu 24 Aug 2023 09:58:18 PM UTC, original submission:  

I'm working with some input RTF files that contain embedded PNG images. UNRTF would complete with no warnings or errors but product "empty" 0-byte PNGs. The output HTML produced in-line comments like this:

<!--picture data found, picture dimensions are 0 by 0, depth 1-->

I traced this to the input RTF only containing the following <pictsize> keywords in the {\pict} structure:


It was lacking these <pictsize> keywords:


I presume UNRTF is parsing the image dimensions from these two keywords, which are missing.

Since I'm not sure when this library will be updated, the work-around was duplicating the \picxgoalN keywords to \picxN keywords with the same dimensions, within the \pict structure.

See image section of the RTF spec for more detailed information:


Hope this helps someone!



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