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Re: spec compliance: header CRC?
From: |
Greg Roelofs |
Subject: |
Re: spec compliance: header CRC? |
Date: |
Sun, 15 Aug 2010 17:16:09 -0700 |
Paul Eggert wrote:
>> - algorithm.doc needs updating:
> Thanks, I updated that too (see 2nd patch below).
Thanks, Paul. You might want to rewrote the multi-part section a bit more,
though; with the loss of the flag bit, gzip is now entirely dependent on
external split/combine utilities (not that anybody uses floppies anymore).
>> Also, are you aware of _any_ gzip utilities that support encryption?
> As far as I know, gzip has never supported it. I removed discussion of
> that in algorithm.doc while I was at it.
I was pretty sure of that, but I thought something like WinZip or 7-Zip or
some library/toolkit might have. (I haven't kept up with "gzip compatibles"
myself...)
> diff --git a/algorithm.doc b/algorithm.doc
> index a62800c..c8c3a92 100644
> --- a/algorithm.doc
> +++ b/algorithm.doc
[...]
> +APPNOTE.TXT documentation file in PKZIP 1.93a (October 1991). This
> +version no longer seems to be available online; the latest version is
> +in <http://www.pkware.com/documents/casestudies/APPNOTE.TXT>.
Info-ZIP saved a couple copies of PKWARE's and created several more versions
to reflect our generic and OS-specific extensions (e.g., universal time,
TOPS-20, OS/2 extended attributes, NT ACLs, etc.). You can find them here
at the moment:
http://www.info-zip.org/doc/
I think the only reason gzip refers to the 1991 version is because it was
originally written in 1992 or thereabouts.
Btw, the full crypto sources are here:
ftp://ftp.info-zip.org/pub/infozip/src
http://sourceforge.net/projects/infozip/files/
Not important now, of course. :-)
Greg