[Jazzlib-developers] Extended Local Header

[<je...@pi...>]

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Hello

I hope you have the time to just take a look at this and maybe give me a
comment or hint

I am using jazzlib0.03 to create a zip-file containing one file. The
zip-file is then used by ziplib from PKWare.

The created file are correct is that sense that all my zip-aware
programs (zip, unzip, pkzip, winzip)

Unfortunately the lib which is supposed to use my zipped file cannot
open the file for some reason. When I compare the output from my zipinfo
program (unzip -Z -v myfile.zip) and the same files zipped with Winzip,
I get something like this:

diff myfile.zip winzipped_file.zip
1c1
< Archive:  myfile.zip   203 bytes   1 file
---
> Archive:  winzipped_file.zip   187 bytes   1 file
6,7c6,7
<   Actual offset of end-of-central-dir record:         181 (000000B5h)
<   Expected offset of end-of-central-dir record:       181 (000000B5h)
---
>   Actual offset of end-of-central-dir record:         165 (000000A5h)
>   Expected offset of end-of-central-dir record:       165 (000000A5h)
13c13
<   beginning of the zipfile is 124 (0000007Ch).
---
>   beginning of the zipfile is 108 (0000006Ch).
30c30
<   extended local header:                            yes
---
>   extended local header:                            no
39,41c39,41
<   apparent file type:                               binary
<   non-MSDOS external file attributes:               000000 hex
<   MS-DOS file attributes (00 hex):                  none
---
>   apparent file type:                               text
>   non-MSDOS external file attributes:               81B600 hex
>   MS-DOS file attributes (20 hex):                  arc


Apparently there is a "extended local header" in files created by
jazzlib which does not exist in files created using "other zippers". I
have tried to figure out what an ELH means, but zero result so far. I
checked jazzlib sources, but that didn't help me.

Also there is some diff regarding file types and file attributes, but I
hardly think they are the problem.

If you have any ideas what this is, and how I can force jazzlib not to
create that ELH I would be very grateful!

Btw, I tried using standard java.util.zip package and that gives the
same result as jazzlib

/Kind regards
Martin Wickman



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