Am Wed, 1 Feb 2012 17:23:09 +0200 schrieb Khaled Hosny:

> I tried printing the tfm table we pass to the backed, and the checksum
> matches the one in the VF file, so this is a bit confusing 

Well I actually don't know what test is actually done (and why
exactly) but some remarks:

1. If I try to convert the binary "pplr7t.vf" to the readable
vpl-file I need *two* tfm-files: pplr7t.tfm and pplr8r.tfm. 

2. vftovp tells me during the conversion:
   "Check sum in VF file being replaced by TFM check sum" 
which probably means that the vpl-file doesn't contain the original
checksum(s) of the vf-file.

3. The vpl file contains two checksums:

(CHECKSUM O 25136566211)

and a checksum in the mapfont entry:

(MAPFONT D 0
   (FONTNAME pplr8r)
   (FONTCHECKSUM O 36571141413)
   (FONTAT R 1.0)
   (FONTDSIZE R 10.0)
   )

So which of both is actually checked against which tfm checksum (and
gives the mismatch message)?


Btw: Two years ago I ran against a checksum mismatch message
concerning the width of characters. In this case the culprit was a
different calculation method for tfm and vf:

http://tug.org/mailman/htdig/pdftex/2009-May/008035.html


-- 
Ulrike Fischer 

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