net backend problems (was: Re: [sane-devel] a backend test)

[mh]

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Henning Meier-Geinitz, Mittwoch, 20. März 2002 00:00:
...
> That doesn't mean that I don't find bugs but they are located in the
> backends not in tst-backend currently. I'm looking into the net
> backend and wire code currently. Lots of pleasure...

While you're working on the net backend, could you please take a look at the 
following problem ? It was introduced by a patch to solve the endianness 
problems, which I send to the list last year and which you applied, after no 
one complaint.

This code will blow up, if e.g. a frontend requests only one byte or if 
calling read() (in sane_read()) results in nread == 1.
In this case, the frontend/net backend will hang forever.

If you don't have a better solution already, please review the attached 
patch. 
To make testing a little easier, the patched net backend reads the 
environment variable SANE_FORCE_WRONG_ENDIANNESS. If you set it,
you can test byte-swapping also, if server/client have the same byte order.
To test scanning "one byte at a time", either hack the frontend, or uncomment 
the line
/* max_length = 1;*/
in sane_read().

Michael
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