My conclusions from PKWARE Application Note:
1. Encoding must be OEM code page of terminal where zip will be viewed or
unpacked;
2. "version made by" field must be set in accordance with OS where zip will be
viewed or unpacked;
3. If filenames encoded in UTF-8 (Linux terminal code page), general purpose
bit 11 for UTF-8 must be set for crossplatform compatibility. Last versions of
some windows archivers supports it.
I have no idea yet what command line options and defaults must be and how
integrate it with CGI.
But with hardcoded charset and "version made by" BackupPC_zipCreate works
perfectly well with most windows archivers.
BackupPC_zipCreate:
8<--------------------------
#=> Set OEM code page for unpacking terminal
my $Charset = "cp866"; #Cyrillic code page. Change to yours windows terminal
code page.
8<--------------------------
# Specify the compression level for this member
$zipmember->desiredCompressionLevel($compLevel) if ($compLevel =~ /[0-9]/);
#=> Set "version made by" field to 0 (MS-DOS)
$zipmember->fileAttributeFormat('FA_MSDOS');
#=> Set general purpose bit 11 for UTF-8
$zipmember->{bitFlag} = $zipmember->{bitFlag} | 0x0800 if ( $Charset eq ""
);
# Finally Zip the member
$zipfh->addMember($zipmember);
}
8<--------------------------
P.S. Also Appendix D of Application Note on the .ZIP file defines optional
"Extra Field" storage for UTF filenames. But no archivers that really supports
it.
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