[tex-k] Total number of words in pltotf

Hironobu Yamashita h.y.acetaminophen at gmail.com
Sun Sep 10 06:17:07 CEST 2017

> When huge LIGKERN program is used like this (lklarge0.pl),
> https://gist.github.com/aminophen/c8b7c2bc3e0d28b11b365b7896bfebbb
> 'pltotf' does not complain about it but both 'tftopl' and 'tex'
> complains about the output TFM:
> $ pltotf lklarge0
> $ tftopl lklarge0 temp
> The first byte of the input file exceeds 127!
> Sorry, but I can't go on; are you sure this is a TFM?
> $ tex "\font\x=lklarge0 at 10pt\x A\bye"
> ! Font \x=lklarge0 at 10.0pt not loadable: Bad metric (TFM) file.

The problem seems specific to web2c implementation of pltotf.
In pltotf.web, we find

@!lf:0..32767; {the number of words in the entire \.{TFM} file}

however, web2c converts this into

short lf  ;

This conversion mistakenly allows 'lf' to overflow, and it ends
up generating invalid TFM file. I hope the attached patch can
be safely applied to pltotf.ch.

Hironobu Yamashita

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