Re: spec compliance: header CRC?

[Greg Roelofs]

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