zip.pm

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

Returns the name of the file last read from. If nothing has
been read yet, returns an empty string; if read from a file
handle, returns the handle in string form.

=back

=head2 Zip Archive Member Operations

Various operations on a zip file modify members. When a member is
passed as an argument, you can either use a reference to the member
itself, or the name of a member. Of course, using the name requires
that names be unique within a zip (this is not enforced).

=over 4

=item removeMember( $memberOrName )

Remove and return the given member, or match its name and
remove it. Returns undef if member or name doesn't exist in this
Zip. No-op if member does not belong to this zip.

=item replaceMember( $memberOrName, $newMember )

Remove and return the given member, or match its name and
remove it. Replace with new member. Returns undef if member or
name doesn't exist in this Zip, or if C<$newMember> is undefined.

It is an (undiagnosed) error to provide a C<$newMember> that is a
member of the zip being modified.

    my $member1 = $zip->removeMember( 'xyz' );
    my $member2 = $zip->replaceMember( 'abc', $member1 );
    # now, $member2 (named 'abc') is not in $zip,
    # and $member1 (named 'xyz') is, having taken $member2's place.

=item extractMember( $memberOrName [, $extractedName ] )

Extract the given member, or match its name and extract it.
Returns undef if member doesn't exist in this Zip. If
optional second arg is given, use it as the name of the
extracted member. Otherwise, the internal filename of the
member is used as the name of the extracted file or
directory.
If you pass C<$extractedName>, it should be in the local file
system's format.
All necessary directories will be created. Returns C<AZ_OK>
on success.

=item extractMemberWithoutPaths( $memberOrName [, $extractedName ] )

Extract the given member, or match its name and extract it.
Does not use path information (extracts into the current
directory). Returns undef if member doesn't exist in this
Zip.
If optional second arg is given, use it as the name of the
extracted member (its paths will be deleted too). Otherwise,
the internal filename of the member (minus paths) is used as
the name of the extracted file or directory. Returns C<AZ_OK>
on success.

=item addMember( $member )

Append a member (possibly from another zip file) to the zip
file. Returns the new member. Generally, you will use
addFile(), addDirectory(), addFileOrDirectory(), addString(),
or read() to add members.

    # Move member named 'abc' to end of zip:
    my $member = $zip->removeMember( 'abc' );
    $zip->addMember( $member );

=item updateMember( $memberOrName, $fileName )

Update a single member from the file or directory named C<$fileName>.
Returns the (possibly added or updated) member, if any; C<undef> on
errors.
The comparison is based on C<lastModTime()> and (in the case of a
non-directory) the size of the file.

=item addFile( $fileName [, $newName ] )

Append a member whose data comes from an external file,
returning the member or undef. The member will have its file
name set to the name of the external file, and its
desiredCompressionMethod set to COMPRESSION_DEFLATED. The
file attributes and last modification time will be set from
the file.
If the name given does not represent a readable plain file or
symbolic link, undef will be returned. C<$fileName> must be
in the format required for the local file system.
The optional C<$newName> argument sets the internal file name
to something different than the given $fileName. C<$newName>,
if given, must be in Zip name format (i.e. Unix).
The text mode bit will be set if the contents appears to be
text (as returned by the C<-T> perl operator).


I<NOTE> that you shouldn't (generally) use absolute path names
in zip member names, as this will cause problems with some zip
tools as well as introduce a security hole and make the zip
harder to use.

=item addDirectory( $directoryName [, $fileName ] )



Append a member created from the given directory name. The
directory name does not have to name an existing directory.
If the named directory exists, the file modification time and
permissions are set from the existing directory, otherwise
they are set to now and permissive default permissions.
C<$directoryName> must be in local file system format.
The optional second argument sets the name of the archive
member (which defaults to C<$directoryName>). If given, it
must be in Zip (Unix) format.
Returns the new member.

=item addFileOrDirectory( $name [, $newName ] )



Append a member from the file or directory named $name. If
$newName is given, use it for the name of the new member.
Will add or remove trailing slashes from $newName as needed.
C<$name> must be in local file system format.
The optional second argument sets the name of the archive
member (which defaults to C<$name>). If given, it must be in
Zip (Unix) format.

=item addString( $stringOrStringRef, $name )



Append a member created from the given string or string
reference. The name is given by the second argument.
Returns the new member. The last modification time will be
set to now, and the file attributes will be set to permissive
defaults.

    my $member = $zip->addString( 'This is a test', 'test.txt' );

=item contents( $memberOrMemberName [, $newContents ] )



Returns the uncompressed data for a particular member, or
undef.

    print "xyz.txt contains " . $zip->contents( 'xyz.txt' );

Also can change the contents of a member:

    $zip->contents( 'xyz.txt', 'This is the new contents' );

If called expecting an array as the return value, it will include
the status as the second value in the array.

    ($content, $status) = $zip->contents( 'xyz.txt');

=back

=head2 Zip Archive I/O operations


A Zip archive can be written to a file or file handle, or read from
one.

=over 4

=item writeToFileNamed( $fileName )



Write a zip archive to named file. Returns C<AZ_OK> on
success.

    my $status = $zip->writeToFileNamed( 'xx.zip' );
    die "error somewhere" if $status != AZ_OK;

Note that if you use the same name as an existing zip file
that you read in, you will clobber ZipFileMembers. So
instead, write to a different file name, then delete the
original.
If you use the C<overwrite()> or C<overwriteAs()> methods, you can
re-write the original zip in this way.
C<$fileName> should be a valid file name on your system.

=item writeToFileHandle( $fileHandle [, $seekable] )

Write a zip archive to a file handle. Return AZ_OK on
success. The optional second arg tells whether or not to try
to seek backwards to re-write headers. If not provided, it is
set if the Perl C<-f> test returns true. This could fail on
some operating systems, though.

    my $fh = IO::File->new( 'someFile.zip', 'w' );
    unless ( $zip->writeToFileHandle( $fh ) != AZ_OK ) {
        # error handling
    }

If you pass a file handle that is not seekable (like if
you're writing to a pipe or a socket), pass a false second
argument:

    my $fh = IO::File->new( '| cat > somefile.zip', 'w' );
    $zip->writeToFileHandle( $fh, 0 );   # fh is not seekable

If this method fails during the write of a member, that
member and all following it will return false from
C<wasWritten()>. See writeCentralDirectory() for a way to
deal with this.
If you want, you can write data to the file handle before
passing it to writeToFileHandle(); this could be used (for
instance) for making self-extracting archives. However, this
only works reliably when writing to a real file (as opposed
to STDOUT or some other possible non-file).

See examples/selfex.pl for how to write a self-extracting
archive.

=item writeCentralDirectory( $fileHandle [, $offset ] )

Writes the central directory structure to the given file
handle.

Returns AZ_OK on success. If given an $offset, will
seek to that point before writing. This can be used for
recovery in cases where writeToFileHandle or writeToFileNamed
returns an IO error because of running out of space on the
destination file.

You can truncate the zip by seeking backwards and then writing the
directory:

    my $fh = IO::File->new( 'someFile.zip', 'w' );
    	my $retval = $zip->writeToFileHandle( $fh );
    if ( $retval == AZ_IO_ERROR ) {
        my @unwritten = grep { not $_->wasWritten() } $zip->members();
        if (@unwritten) {
            $zip->removeMember( $member ) foreach my $member ( @unwritten );
            $zip->writeCentralDirectory( $fh,
            $unwritten[0]->writeLocalHeaderRelativeOffset());
        }
    }

=item overwriteAs( $newName )

Write the zip to the specified file, as safely as possible.
This is done by first writing to a temp file, then renaming
the original if it exists, then renaming the temp file, then
deleting the renamed original if it exists. Returns AZ_OK if
successful.

=item overwrite()

Write back to the original zip file. See overwriteAs() above.
If the zip was not ever read from a file, this generates an
error.

=item read( $fileName )

Read zipfile headers from a zip file, appending new members.
Returns C<AZ_OK> or error code.

    my $zipFile = Archive::Zip->new();
    my $status = $zipFile->read( '/some/FileName.zip' );

=item readFromFileHandle( $fileHandle, $filename )

Read zipfile headers from an already-opened file handle,
appending new members. Does not close the file handle.
Returns C<AZ_OK> or error code. Note that this requires a
seekable file handle; reading from a stream is not yet
supported.

    my $fh = IO::File->new( '/some/FileName.zip', 'r' );
    my $zip1 = Archive::Zip->new();
    my $status = $zip1->readFromFileHandle( $fh );
    my $zip2 = Archive::Zip->new();
    $status = $zip2->readFromFileHandle( $fh );

=back

=head2 Zip Archive Tree operations

These used to be in Archive::Zip::Tree but got moved into
Archive::Zip. They enable operation on an entire tree of members or
files.
A usage example:

  use Archive::Zip;
  my $zip = Archive::Zip->new();
  
  # add all readable files and directories below . as xyz/*
  $zip->addTree( '.', 'xyz' );
  
  # add all readable plain files below /abc as def/*
  $zip->addTree( '/abc', 'def', sub { -f && -r } );
  
  # add all .c files below /tmp as stuff/*
  $zip->addTreeMatching( '/tmp', 'stuff', '\.c$' );
  
  # add all .o files below /tmp as stuff/* if they aren't writable
  $zip->addTreeMatching( '/tmp', 'stuff', '\.o$', sub { ! -w } );
  
  # add all .so files below /tmp that are smaller than 200 bytes as stuff/*
  $zip->addTreeMatching( '/tmp', 'stuff', '\.o$', sub { -s < 200 } );
  
  # and write them into a file
  $zip->writeToFileNamed('xxx.zip');
  
  # now extract the same files into /tmpx
  $zip->extractTree( 'stuff', '/tmpx' );

=over 4

=item $zip->addTree( $root, $dest [,$pred] ) -- Add tree of files to a zip

C<$root> is the root of the tree of files and directories to be
added. It is a valid directory name on your system. C<$dest> is
the name for the root in the zip file (undef or blank means
to use relative pathnames). It is a valid ZIP directory name
(that is, it uses forward slashes (/) for separating
directory components). C<$pred> is an optional subroutine
reference to select files: it is passed the name of the
prospective file or directory using C<$_>, and if it returns
true, the file or directory will be included. The default is
to add all readable files and directories. For instance,
using

  my $pred = sub { /\.txt/ };
  $zip->addTree( '.', '', $pred );

will add all the .txt files in and below the current
directory, using relative names, and making the names
identical in the zipfile:

  original name           zip member name
  ./xyz                   xyz
  ./a/                    a/
  ./a/b                   a/b

To translate absolute to relative pathnames, just pass them
in: $zip->addTree( '/c/d', 'a' );

  original name           zip member name
  /c/d/xyz                a/xyz
  /c/d/a/                 a/a/
  /c/d/a/b                a/a/b

Returns AZ_OK on success. Note that this will not follow
symbolic links to directories. Note also that this does not
check for the validity of filenames.

Note that you generally I<don't> want to make zip archive member names
absolute.

=item $zip->addTreeMatching( $root, $dest, $pattern [,$pred] )

$root is the root of the tree of files and directories to be
added $dest is the name for the root in the zip file (undef
means to use relative pathnames) $pattern is a (non-anchored)
regular expression for filenames to match $pred is an
optional subroutine reference to select files: it is passed
the name of the prospective file or directory in C<$_>, and
if it returns true, the file or directory will be included.
The default is to add all readable files and directories. To
add all files in and below the current dirctory whose names
end in C<.pl>, and make them extract into a subdirectory
named C<xyz>, do this:

  $zip->addTreeMatching( '.', 'xyz', '\.pl$' )

To add all I<writable> files in and below the dirctory named
C</abc> whose names end in C<.pl>, and make them extract into
a subdirectory named C<xyz>, do this:

  $zip->addTreeMatching( '/abc', 'xyz', '\.pl$', sub { -w } )

Returns AZ_OK on success. Note that this will not follow
symbolic links to directories.

=item $zip->updateTree( $root, [ $dest, [ $pred [, $mirror]]] );



Update a zip file from a directory tree.

C<updateTree()> takes the same arguments as C<addTree()>, but first
checks to see whether the file or directory already exists in the zip
file, and whether it has been changed.

If the fourth argument C<$mirror> is true, then delete all my members
if corresponding files weren't found.


Returns an error code or AZ_OK if all is well.

=item $zip->extractTree()



=item $zip->extractTree( $root )



=item $zip->extractTree( $root, $dest )



=item $zip->extractTree( $root, $dest, $volume )



If you don't give any arguments at all, will extract all the
files in the zip with their original names.


If you supply one argument for C<$root>, C<extractTree> will extract
all the members whose names start with C<$root> into the current
directory, stripping off C<$root> first.
C<$root> is in Zip (Unix) format.
For instance,

  $zip->extractTree( 'a' );

when applied to a zip containing the files:
a/x a/b/c ax/d/e d/e will extract:


a/x as ./x


a/b/c as ./b/c


If you give two arguments, C<extractTree> extracts all the members
whose names start with C<$root>. It will translate C<$root> into
C<$dest> to construct the destination file name.
C<$root> and C<$dest> are in Zip (Unix) format.
For instance,

   $zip->extractTree( 'a', 'd/e' );

when applied to a zip containing the files:
a/x a/b/c ax/d/e d/e will extract:


a/x to d/e/x


a/b/c to d/e/b/c and ignore ax/d/e and d/e


If you give three arguments, C<extractTree> extracts all the members
whose names start with C<$root>. It will translate C<$root> into
C<$dest> to construct the destination file name, and then it will
convert to local file system format, using C<$volume> as the name of
the destination volume.


C<$root> and C<$dest> are in Zip (Unix) format.


C<$volume> is in local file system format.


For instance, under Windows,

   $zip->extractTree( 'a', 'd/e', 'f:' );

when applied to a zip containing the files:
a/x a/b/c ax/d/e d/e will extract:


a/x to f:d/e/x


a/b/c to f:d/e/b/c and ignore ax/d/e and d/e


If you want absolute paths (the prior example used paths relative to
the current directory on the destination volume, you can specify these
in C<$dest>:

   $zip->extractTree( 'a', '/d/e', 'f:' );

when applied to a zip containing the files:
a/x a/b/c ax/d/e d/e will extract:


a/x to f:\d\e\x


a/b/c to f:\d\e\b\c and ignore ax/d/e and d/e

Returns an error code or AZ_OK if everything worked OK.

=back

=head1 MEMBER OPERATIONS


=head2 Member Class Methods


Several constructors allow you to construct members without adding
them to a zip archive. These work the same as the addFile(),