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Re: very long string support
From: |
Ben Pfaff |
Subject: |
Re: very long string support |
Date: |
Wed, 03 May 2006 08:04:07 -0700 |
User-agent: |
Gnus/5.110004 (No Gnus v0.4) Emacs/21.4 (gnu/linux) |
John Darrington <address@hidden> writes:
> It seems that spss formats a 2551 byte string as 10 consecutive
> 255-byte strings followed by a 103 byte string with the last 102 bytes
> empty.
> Or in general a N byte string (where N > 255) is formated as
> (N div 252) consecutive 255 byte strings followed by a 8xsup(N - (N div
> 252)x255/8) byte string (God knows why!).
> When reading we just have to assume that there'll be "a number" of 255
> byte strings, followed by a string <= 255 bytes in length.
That is truly bizarre. I will have to do some thinking about why
it would do anything so zany.
What do you mean by "xsup"?
> In both cases we'd also need to add something like
> "w->has_very_long_strings" to the conditions to take the slow
> path.
>
> OK. I think that's where I came into problems. I was trying to
> ensure that the fast path would always be taken. Maybe that was a
> misguided goal.
I don't think it's a worthwhile thing to try to optimize that
little bit of code, especially if it inconveniences other code.
> I'm not sure about the comments you made about AGGREGATE. Can you
> provide a test case which fails. Then I can check it in as a
> regression test.
On second thought I'm not sure whether AGGREGATE is affected. It
does support long strings, though. I'll see.
--
Ben Pfaff
email: address@hidden
web: http://benpfaff.org
- very long string support, Ben Pfaff, 2006/05/02
- Re: very long string support, John Darrington, 2006/05/02
- Re: very long string support, Ben Pfaff, 2006/05/02
- Re: very long string support, John Darrington, 2006/05/02
- Re: very long string support, Ben Pfaff, 2006/05/03
- Re: very long string support, John Darrington, 2006/05/03
- Re: very long string support,
Ben Pfaff <=
- Re: very long string support, John Darrington, 2006/05/05
- Re: very long string support, Ben Pfaff, 2006/05/06