[liblouis-liblouisxml] Re: Python bindings and output buffer size for lou_translate*
- From: Christian Egli <christian.egli@xxxxxxxx>
- To: James Teh <jamie@xxxxxxxxxxxx>
- Date: Mon, 02 Aug 2010 14:21:47 +0200
Hi
James Teh <jamie@xxxxxxxxxxxx> writes:
> Hi all,
>
> For lou_translate* in the Python bindings, we've made an assumption
> that outlen should be 2 * inlen. However, this assumption is very
> wrong if there are characters in the input which aren't defined in the
> specified tables.
I've also run into this issue when using the correct opcode, e.g.
correct "foo" "foobarbaz".
> I'd like to change the Python bindings to do this and suggest that
> perhaps the documentation should be updated with a similar guideline.
Has there been any conclusion on this, i.e. as to how to change the
bindings? In my case the problem was that the bindings had a buffer
overrun and crashed the Python interpreter outright. OK, I discovered
that the correct opcode in case was faulty and changed that, but it
should never take down the entire Python interpreter.
> An alternative is to keep checking whether translation wasn't
> completed (i.e. inlen is less than its original value) and then
> increase outlen if so, probably multiplying outlen by 2 each time.
How do you do this, I mean how do you check for buffer overrun from the
Python bindings.
> What do people think?
I would welcome a solution to this. Increasing the ratio would be fine
by me.
Thanks
Christian
--
Christian Egli
Swiss Library for the Blind, Visually Impaired and Print Disabled
Grubenstrasse 12, CH-8045 Zürich, Switzerland
For a description of the software and to download it go to
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