On Thursday 11 December 2003 12:33 pm, you wrote: > "bad signature" errors (was: Archive::Zip 1.09 breaks PAR) > From: Autrijus Tang <[EMAIL PROTECTED]> > To: Roderich Schupp <[EMAIL PROTECTED]> > CC: PAR Mailing List <[EMAIL PROTECTED]>, "Ned Konz <[EMAIL PROTECTED]>" > > On Wed, Dec 10, 2003 at 01:01:13PM +0100, Roderich Schupp wrote: > > the recently (27 Nov 2003) released Archive::Zip 1.09 doesn't get > > quite get along with PAR 0.76. > > > > On WindowsXP, Perl 5.8.1, I get: > > > > C:\temp\cpan\build\PAR-0.76>pp -o hello.exe -e "print q[hello]" > > C:\temp\cpan\build\PAR-0.76>hello.exe > > format error: bad signature: 0x00905a4d at offset 0 in file > > IO::File=GLOB(0xd9b02c) at -e line 660 > > format error: bad signature: 0x6e757220 at offset 100 in file > > IO::File=GLOB(0xd9b02c) at -e line 159 > > format error: bad signature: 0x00000000 at offset 37 in file > > IO::File=GLOB(0xd9b02c) at ../blib/lib/PAR.pm line 211 > > hello > > Thanks for finding the cause for this problem. Archive::Zip 1.09 says > this in its changelog: > > - Always check for local header signatures before using them > > But for "padded" executables, of course it will have bad signatures, > as it has a loader preceding it.
I don't see why that's the case. If you're making an application that prepends a loader, you should rewrite the EOCD headers with new offsets to make them match. You can't just stick arbitrary binary data in front of a zip file and still have it be a correct format. > I think that self-extracting zip > files (i.e. unzipsfx) will also be affected. Not if they're built properly. Really, all you have to do is to use Archive::Zip to put the self-extracting stub at the front of the file (see my examples/selfex.pl for a trivial example). > See Archive/Zip.pm line 376: > > # compare with expected signature, if any, or any known signature. > > (Cc'ing the module author, Ned Konz.) > > Ned, is there a way for us to say "Please ignore $expected_signature, > don't show those warnings" to Archive::Zip, either as a constructor > parameter, or as a global config variable? > > I don't feel like to redefine key Archive::Zip subroutines, so if > there can be a knob to turn off such checks, it will be appreciated. You can define your own error handler if you want (see the manual). -- Ned Konz http://bike-nomad.com GPG key ID: BEEA7EFE
