anyinflate.pm

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    AUTOCLOSE
    autoclose

OPTS is a combination of the following options:

=over 5

=item C<< AutoClose => 0|1 >>

This option is only valid when the C<$input> parameter is a filehandle. If
specified, and the value is true, it will result in the file being closed once
either the C<close> method is called or the IO::Uncompress::AnyInflate object is
destroyed.

This parameter defaults to 0.

=item C<< MultiStream => 0|1 >>



Allows multiple concatenated compressed streams to be treated as a single
compressed stream. Decompression will stop once either the end of the
file/buffer is reached, an error is encountered (premature eof, corrupt
compressed data) or the end of a stream is not immediately followed by the
start of another stream.

This parameter defaults to 0.


=item C<< Prime => $string >>

This option will uncompress the contents of C<$string> before processing the
input file/buffer.

This option can be useful when the compressed data is embedded in another
file/data structure and it is not possible to work out where the compressed
data begins without having to read the first few bytes. If this is the
case, the uncompression can be I<primed> with these bytes using this
option.

=item C<< Transparent => 0|1 >>

If this option is set and the input file/buffer is not compressed data,
the module will allow reading of it anyway.

In addition, if the input file/buffer does contain compressed data and
there is non-compressed data immediately following it, setting this option
will make this module treat the whole file/bufffer as a single data stream.

This option defaults to 1.

=item C<< BlockSize => $num >>

When reading the compressed input data, IO::Uncompress::AnyInflate will read it in
blocks of C<$num> bytes.

This option defaults to 4096.

=item C<< InputLength => $size >>

When present this option will limit the number of compressed bytes read
from the input file/buffer to C<$size>. This option can be used in the
situation where there is useful data directly after the compressed data
stream and you know beforehand the exact length of the compressed data
stream. 

This option is mostly used when reading from a filehandle, in which case
the file pointer will be left pointing to the first byte directly after the
compressed data stream.



This option defaults to off.

=item C<< Append => 0|1 >>

This option controls what the C<read> method does with uncompressed data.

If set to 1, all uncompressed data will be appended to the output parameter
of the C<read> method.

If set to 0, the contents of the output parameter of the C<read> method
will be overwritten by the uncompressed data.

Defaults to 0.

=item C<< Strict => 0|1 >>



This option controls whether the extra checks defined below are used when
carrying out the decompression. When Strict is on, the extra tests are
carried out, when Strict is off they are not.

The default for this option is off.


If the input is an RFC 1950 data stream, the following will be checked:




=over 5

=item 1

The ADLER32 checksum field must be present.

=item 2

The value of the ADLER32 field read must match the adler32 value of the
uncompressed data actually contained in the file.

=back



If the input is a gzip (RFC 1952) data stream, the following will be checked:




=over 5

=item 1 

If the FHCRC bit is set in the gzip FLG header byte, the CRC16 bytes in the
header must match the crc16 value of the gzip header actually read.

=item 2

If the gzip header contains a name field (FNAME) it consists solely of ISO
8859-1 characters.

=item 3

If the gzip header contains a comment field (FCOMMENT) it consists solely
of ISO 8859-1 characters plus line-feed.

=item 4

If the gzip FEXTRA header field is present it must conform to the sub-field
structure as defined in RFC 1952.

=item 5

The CRC32 and ISIZE trailer fields must be present.

=item 6

The value of the CRC32 field read must match the crc32 value of the
uncompressed data actually contained in the gzip file.

=item 7

The value of the ISIZE fields read must match the length of the
uncompressed data actually read from the file.

=back





=item C<< RawInflate => 0|1 >>

When auto-detecting the compressed format, try to test for raw-deflate (RFC
1951) content using the C<IO::Uncompress::RawInflate> module. 

The reason this is not default behaviour is because RFC 1951 content can
only be detected by attempting to uncompress it. This process is error
prone and can result is false positives.

Defaults to 0.




=item C<< ParseExtra => 0|1 >>
If the gzip FEXTRA header field is present and this option is set, it will
force the module to check that it conforms to the sub-field structure as
defined in RFC 1952.

If the C<Strict> is on it will automatically enable this option.

Defaults to 0.




=back

=head2 Examples

TODO

=head1 Methods 

=head2 read

Usage is

    $status = $z->read($buffer)

Reads a block of compressed data (the size the the compressed block is
determined by the C<Buffer> option in the constructor), uncompresses it and
writes any uncompressed data into C<$buffer>. If the C<Append> parameter is
set in the constructor, the uncompressed data will be appended to the
C<$buffer> parameter. Otherwise C<$buffer> will be overwritten.

Returns the number of uncompressed bytes written to C<$buffer>, zero if eof
or a negative number on error.

=head2 read

Usage is

    $status = $z->read($buffer, $length)
    $status = $z->read($buffer, $length, $offset)

    $status = read($z, $buffer, $length)
    $status = read($z, $buffer, $length, $offset)

Attempt to read C<$length> bytes of uncompressed data into C<$buffer>.

The main difference between this form of the C<read> method and the
previous one, is that this one will attempt to return I<exactly> C<$length>
bytes. The only circumstances that this function will not is if end-of-file
or an IO error is encountered.

Returns the number of uncompressed bytes written to C<$buffer>, zero if eof
or a negative number on error.


=head2 getline

Usage is

    $line = $z->getline()
    $line = <$z>

Reads a single line. 

This method fully supports the use of of the variable C<$/> (or
C<$INPUT_RECORD_SEPARATOR> or C<$RS> when C<English> is in use) to
determine what constitutes an end of line. Paragraph mode, record mode and
file slurp mode are all supported. 


=head2 getc

Usage is 

    $char = $z->getc()

Read a single character.

=head2 ungetc

Usage is

    $char = $z->ungetc($string)



=head2 inflateSync

Usage is

    $status = $z->inflateSync()

TODO


=head2 getHeaderInfo

Usage is

    $hdr  = $z->getHeaderInfo();
    @hdrs = $z->getHeaderInfo();

This method returns either a hash reference (in scalar context) or a list
or hash references (in array context) that contains information about each
of the header fields in the compressed data stream(s).




=head2 tell

Usage is

    $z->tell()
    tell $z

Returns the uncompressed file offset.

=head2 eof

Usage is

    $z->eof();
    eof($z);



Returns true if the end of the compressed input stream has been reached.



=head2 seek

    $z->seek($position, $whence);
    seek($z, $position, $whence);




Provides a sub-set of the C<seek> functionality, with the restriction
that it is only legal to seek forward in the input file/buffer.
It is a fatal error to attempt to seek backward.



The C<$whence> parameter takes one the usual values, namely SEEK_SET,
SEEK_CUR or SEEK_END.

Returns 1 on success, 0 on failure.

=head2 binmode

Usage is

    $z->binmode
    binmode $z ;

This is a noop provided for completeness.

=head2 opened

    $z->opened()

Returns true if the object currently refers to a opened file/buffer. 

=head2 autoflush

    my $prev = $z->autoflush()
    my $prev = $z->autoflush(EXPR)

If the C<$z> object is associated with a file or a filehandle, this method
returns the current autoflush setting for the underlying filehandle. If
C<EXPR> is present, and is non-zero, it will enable flushing after every
write/print operation.

If C<$z> is associated with a buffer, this method has no effect and always
returns C<undef>.

B<Note> that the special variable C<$|> B<cannot> be used to set or
retrieve the autoflush setting.

=head2 input_line_number

    $z->input_line_number()
    $z->input_line_number(EXPR)



Returns the current uncompressed line number. If C<EXPR> is present it has
the effect of setting the line number. Note that setting the line number
does not change the current position within the file/buffer being read.

The contents of C<$/> are used to to determine what constitutes a line
terminator.



=head2 fileno

    $z->fileno()
    fileno($z)

If the C<$z> object is associated with a file or a filehandle, this method
will return the underlying file descriptor.

If the C<$z> object is is associated with a buffer, this method will
return undef.

=head2 close

    $z->close() ;
    close $z ;



Closes the output file/buffer. 



For most versions of Perl this method will be automatically invoked if
the IO::Uncompress::AnyInflate object is destroyed (either explicitly or by the
variable with the reference to the object going out of scope). The
exceptions are Perl versions 5.005 through 5.00504 and 5.8.0. In
these cases, the C<close> method will be called automatically, but
not until global destruction of all live objects when the program is
terminating.

Therefore, if you want your scripts to be able to run on all versions
of Perl, you should call C<close> explicitly and not rely on automatic
closing.

Returns true on success, otherwise 0.

If the C<AutoClose> option has been enabled when the IO::Uncompress::AnyInflate
object was created, and the object is associated with a file, the
underlying file will also be closed.




=head2 nextStream

Usage is

    my $status = $z->nextStream();

Skips to the next compressed data stream in the input file/buffer. If a new
compressed data stream is found, the eof marker will be cleared and C<$.>
will be reset to 0.

Returns 1 if a new stream was found, 0 if none was found, and -1 if an
error was encountered.

=head2 trailingData

Usage is

    my $data = $z->trailingData();

Returns the data, if any, that is present immediately after the compressed
data stream once uncompression is complete. It only makes sense to call
this method once the end of the compressed data stream has been
encountered.

This option can be used when there is useful information immediately
following the compressed data stream, and you don't know the length of the
compressed data stream.

If the input is a buffer, C<trailingData> will return everything from the
end of the compressed data stream to the end of the buffer.

If the input is a filehandle, C<trailingData> will return the data that is
left in the filehandle input buffer once the end of the compressed data
stream has been reached. You can then use the filehandle to read the rest
of the input file. 

Don't bother using C<trailingData> if the input is a filename.



If you know the length of the compressed data stream before you start
uncompressing, you can avoid having to use C<trailingData> by setting the
C<InputLength> option in the constructor.

=head1 Importing 

No symbolic constants are required by this IO::Uncompress::AnyInflate at present. 

=over 5

=item :all

Imports C<anyinflate> and C<$AnyInflateError>.
Same as doing this

    use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ;

=back

=head1 EXAMPLES




=head1 SEE ALSO

L<Compress::Zlib>, L<IO::Compress::Gzip>, L<IO::Uncompress::Gunzip>, L<IO::Compress::Deflate>, L<IO::Uncompress::Inflate>, L<IO::Compress::RawDeflate>, L<IO::Uncompress::RawInflate>, L<IO::Compress::Bzip2>, L<IO::Uncompress::Bunzip2>, L<IO::Compress::Lzop>, L<IO::Uncompress::UnLzop>, L<IO::Compress::Lzf>, L<IO::Uncompress::UnLzf>, L<IO::Uncompress::AnyUncompress>

L<Compress::Zlib::FAQ|Compress::Zlib::FAQ>

L<File::GlobMapper|File::GlobMapper>, L<Archive::Zip|Archive::Zip>,
L<Archive::Tar|Archive::Tar>,
L<IO::Zlib|IO::Zlib>


For RFC 1950, 1951 and 1952 see 
F<http://www.faqs.org/rfcs/rfc1950.html>,
F<http://www.faqs.org/rfcs/rfc1951.html> and
F<http://www.faqs.org/rfcs/rfc1952.html>

The I<zlib> compression library was written by Jean-loup Gailly
F<[e-mail]> and Mark Adler F<[e-mail]>.

The primary site for the I<zlib> compression library is
F<http://www.zlib.org>.

The primary site for gzip is F<http://www.gzip.org>.




=head1 AUTHOR

This module was written by Paul Marquess, F<[e-mail]>. 



=head1 MODIFICATION HISTORY

See the Changes file.

=head1 COPYRIGHT AND LICENSE

Copyright (c) 2005-2007 Paul Marquess. All rights reserved.

This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.