sblanton has asked for the wisdom of the Perl Monks concerning the following question:
Hi All,
I'm having trouble using Archive::Zip to write a file that is then readable by the jar program (Sun JDK 1.5.0_10).
I want to take a JAR created elsewhere and modify a file inside it with perl an write it back out. However, after modification and writing out with Archive::Zip, the jar program gives an error when reading the contents. Here are the stripped down steps:
- Create foo.jar: 'jar cf foo.jar hello.txt'
- Run the following code:
- Now run 'jar tf bar.jar'. This gives the error:
java.util.zip.ZipException: only DEFLATED entries can have EXT descrip +tor at java.util.zip.ZipInputStream.readLOC(ZipInputStream.java:250) at java.util.zip.ZipInputStream.getNextEntry(ZipInputStream.java:7 +3) at sun.tools.jar.Main.list(Main.java:735) at sun.tools.jar.Main.run(Main.java:191) at sun.tools.jar.Main.main(Main.java:903)
** This gives no errors or warnings.**use Archive::Zip qw( :ERROR_CODES :CONSTANTS ); my $az_foo = Archive::Zip->new('foo.jar'); unless ($az_foo->writeToFileNamed('bar.jar') == AZ_OK ) { die 'write error'; } my $az_bar = Archive::Zip->new(); unless ( $az_bar->read('bar.jar') == AZ_OK ) { die 'bad bar bad!' }
- bar.jar is 2 bytes smaller than foo.jar
- The directory member for META-INF/ has a few different parameters between the two JAR's:
- compressionMethod: foo.jar=8, bar.jar=0
- desiredCompressionMethod: foo.jar=8, bar.jar=0
- desiredCompressionLevel: foo.jar=-1, bar.jar=0
- I've tried manually setting these parameters on the member before writing out, but the values remain the same.
It seems to me the 'META-INF/' directory member is actually expected to be deflated by the jar program - doesn't make sense. I thought I'd ask those wiser than myself before contacting the owner on this one...maybe there is something simple I can do. Cheers and beers.
20070813 Janitored by Corion: Changed PRE tags to P tags, as per Writeup Formatting Tips
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Re: Archive::Zip Problem: Zip versus Jar file formats
by Joost (Canon) on Aug 13, 2007 at 18:59 UTC | |
Re: Archive::Zip Problem: Zip versus Jar file formats
by jimbojones (Friar) on Aug 15, 2007 at 15:50 UTC | |
by Anonymous Monk on Aug 15, 2007 at 16:06 UTC | |
by sblanton (Sexton) on Aug 22, 2007 at 20:17 UTC | |
by sblanton (Sexton) on Aug 22, 2007 at 20:30 UTC |