On Apr 26, 2010, at 5:47 PM, Evan Schoenberg, M.D. wrote:
> So LMX is supposed to be able to take data in chunks, from the end of the
> file. It turns out that this doesn't work if a chunk breaks up an entity,
> though.
>
> A chat transcript, submitted by lhirlimann to me via email by request,
> exhibits this behavior on my machine, when read by
> -[DCMessageContextDisplayPlugin contextForChat:], since that method reads in
> 4*getpagesize() byte chunks and that number of bytes from the end is the
> middle of an entity.
>
> Specifically, the resulting chunk #1 starts with 'apos'. The resulting chunk
> #2 ends with '&'.
>
> The result is an assertion failure:
> *** Assertion failure in -[LMXParser parseEntityReference:],
> /Volumes/Huffman/Projects/lmx-sholt/LMXParser.m:605
> "entity name was empty! currentIndex is 5193 (&) out of 21579 bytes"
>
> It's not clear to me how to proceed with a fix. Do you (yes, you!) have any
> ideas?
>
> I don't want to post the user's chat log to a public mailing list; if you're
> an existing developer and would like it in order to easily see the behavior,
> email me off-list.
>
> This took way too long to hunt down, though it's a fairly obvious problem in
> retrospect.
>
> Cheers,
> Evan
Silly hackish fix: @try { thing that throws assertion failure } @catch (...) {
read a few more bytes so we're not in mid-entity and try again }
David
