Viewing file:  zipinfo.pl (4.36 KB) -rw-r--r--
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#!/usr/bin/perl -w
# Print out information about a ZIP file.
# Note that this buffers the entire file into memory!
# usage:
# perl examples/zipinfo.pl zipfile.zip
use strict;
use Data::Dumper ();
use FileHandle;
use Archive::Zip qw(:ERROR_CODES :CONSTANTS :PKZIP_CONSTANTS);
use Archive::Zip::BufferedFileHandle;
$| = 1;
### Workaround for a bug in version of Data::Dumper bundled
### with some versions of Perl, which causes warnings when
### calling ->Seen below.
if (defined &Data::Dumper::init_refaddr_format) {
Data::Dumper::init_refaddr_format();
}
# use constant END_OF_CENTRAL_DIRECTORY_SIGNATURE_STRING;
use constant CENTRAL_DIRECTORY_FILE_HEADER_SIGNATURE_STRING =>
pack(SIGNATURE_FORMAT, CENTRAL_DIRECTORY_FILE_HEADER_SIGNATURE);
use constant LOCAL_FILE_HEADER_SIGNATURE_STRING =>
pack(SIGNATURE_FORMAT, LOCAL_FILE_HEADER_SIGNATURE);
$Data::Dumper::Useqq = 1; # enable double-quotes for string values
$Data::Dumper::Indent = 1;
my $zip = Archive::Zip->new();
my $zipFileName = shift(@ARGV);
my $fh = Archive::Zip::BufferedFileHandle->new();
$fh->readFromFile($zipFileName) or exit($!);
my $status = $zip->_findEndOfCentralDirectory($fh);
die("can't find EOCD\n") if $status != AZ_OK;
my $eocdPosition = $fh->tell();
$status = $zip->_readEndOfCentralDirectory($fh);
die("can't read EOCD\n") if $status != AZ_OK;
my $zipDumper = Data::Dumper->new([$zip], ['ZIP']);
$zipDumper->Seen({ref($fh), $fh});
print $zipDumper->Dump(), "\n";
my $expectedEOCDPosition =
$zip->centralDirectoryOffsetWRTStartingDiskNumber() +
$zip->centralDirectorySize();
my $eocdOffset = $zip->{eocdOffset} = $eocdPosition - $expectedEOCDPosition;
if ($eocdOffset) {
printf "Expected EOCD at %d (0x%x) but found it at %d (0x%x)\n",
($expectedEOCDPosition) x 2, ($eocdPosition) x 2;
} else {
printf("Found EOCD at %d (0x%x)\n\n", ($eocdPosition) x 2);
}
my $contents = $fh->contents();
my $offset = $eocdPosition + $eocdOffset - 1;
my $cdPos;
my @members;
my $numberOfMembers = $zip->numberOfCentralDirectoriesOnThisDisk();
foreach my $n (0 .. $numberOfMembers - 1) {
my $index = $numberOfMembers - $n;
$cdPos = rindex($contents,
CENTRAL_DIRECTORY_FILE_HEADER_SIGNATURE_STRING, $offset);
if ($cdPos < 0) {
print "No central directory found for member #$index\n";
last;
} else {
print "Found central directory for member #$index at $cdPos\n";
$fh->seek($cdPos + SIGNATURE_LENGTH, 0); # SEEK_SET
my $newMember =
Archive::Zip::Member->_newFromZipFile($fh, "($zipFileName)");
$status = $newMember->_readCentralDirectoryFileHeader();
if ($status != AZ_OK and $status != AZ_STREAM_END) {
printf "read CD header status=%d\n", $status;
last;
}
unshift(@members, $newMember);
my $memberDumper =
Data::Dumper->new([$newMember], ['CDMEMBER' . $index]);
$memberDumper->Seen({ref($fh), $fh});
print $memberDumper->Dump(), "\n";
}
$offset = $cdPos - 1;
}
if ( $cdPos >= 0
and $cdPos != $zip->centralDirectoryOffsetWRTStartingDiskNumber()) {
printf
"Expected to find central directory at %d (0x%x), but found it at %d (0x%x)\n",
($zip->centralDirectoryOffsetWRTStartingDiskNumber()) x 2,
($cdPos) x 2;
}
print "\n";
# Now read the local headers
foreach my $n (0 .. $#members) {
my $member = $members[$n];
$fh->seek(
$member->localHeaderRelativeOffset() + $eocdOffset + SIGNATURE_LENGTH,
0);
$status = $member->_readLocalFileHeader();
if ($status != AZ_OK and $status != AZ_STREAM_END) {
printf "member %d read header status=%d\n", $n + 1, $status;
last;
}
my $memberDumper = Data::Dumper->new([$member], ['LHMEMBER' . ($n + 1)]);
$memberDumper->Seen({ref($fh), $fh});
print $memberDumper->Dump(), "\n";
my $endOfMember =
$member->localHeaderRelativeOffset() +
$member->_localHeaderSize() +
$member->compressedSize();
if (
$endOfMember > $cdPos
or ( $n < $#members
and $endOfMember > $members[$n + 1]->localHeaderRelativeOffset())
) {
print "Error: ";
}
printf("End of member: %d, CD at %d", $endOfMember, $cdPos);
if ($n < $#members) {
printf(", next member starts at %d",
$members[$n + 1]->localHeaderRelativeOffset());
}
print("\n\n");
}
# vim: ts=4 sw=4
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