[delphizip] Re: Problem using ExtractFileToStream
- From: "R.Peters" <russellpeters@xxxxxxxxxxx>
- To: delphizip@xxxxxxxxxxxxx
- Date: Sat, 07 Oct 2006 08:05:35 +1000
I had just digging through to the same point and I strongly suspect that
the zip local header sizes are not correct (non-conforming zip file).
With WinZip10 (I think) you can test this by looking at the detailed
report for the file.
File -> Properties -> Detail
this tests the file and I think would catch any problems.
The file is a bit large to email for me to test but, if needed, I could
set up ftp access.
In future versions, for security reasons, the sizes and names will have
to match but at least it will tell of any such discrepancy.
- Russell Peters
Trueman, Christopher wrote:
> I dug out a copy of BCB 5 and made a local version of DelZip179.DLL with
> some more logging.
>
> I found that for my specialized JAR file ZIP in ZIP case, the function
> open_outfile() was failing here:
>
> if ( pG->redirect_data )
> {
> Notify(PF, IVERBOSE, "redirect_size (%u); lrec.ucsize (%u)",
> pG->redirect_size, pG->lrec.ucsize);
>
> return ( pG->redirect_size !=3D pG->lrec.ucsize );
> } =20
>
> pG->redirect_size never matched pG->lrec.ucsize. In fact
> pG->lrec.ucsize is 0 for all my ZIP entries irrespective of if it is a
> ZIP in a ZIP or just a regular file in a ZIP.
>
> It seems that the central record that feeds the DirEntry list reads its
> data from the central ZIP directory. There, the compressed and
> uncompressed (pG->crec.csize and pG->crec.ucsize) property values are
> correct (WinZip 10 reports the same values).
>
> Not knowing enough about the ZIP format or the DelZip implementation I
> am not sure how to proceed.
>
> Thoughts:
>
> * Is my specialized JAR file not really a valid ZIP?
>
> * Is the local record strictly necessary to support the decompression of
> a file. Extract seems to work OK without it, but I've not debugged
> through that.
>
> Comments welcomed.
>
>
>
> Chris.
>
>
>> The original ZIP is 4.5MB. The contained ZIP is 2K when=20
>> extracted with WinZip 10.
>> =20
>> The original file and the contained files are, I'm pretty=20
>> sure, just a Java JAR formatted file which I understood was=20
>> built on the ZIP format.
>> =20
>> =20
>> I have DelZip179.DLL.
>>
>
> <snip>
>
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