[delphizip] Re: Problem using ExtractFileToStream
- From: "Trueman, Christopher" <ctrueman@xxxxxxxxxxxxxxx>
- To: <delphizip@xxxxxxxxxxxxx>
- Date: Fri, 6 Oct 2006 14:35:59 -0700
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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