CONTENTS

• NAME
• SYNOPSIS
• DESCRIPTION
• Functional Interface
  • anyinflate $input => $output [, OPTS]
    • The $input parameter
    • The $output parameter
  • Notes
  • Optional Parameters
  • Examples
• OO Interface
  • Constructor
  • Constructor Options
  • Examples
• Methods
  • read
  • read
  • getline
  • getc
  • ungetc
  • inflateSync
  • getHeaderInfo
  • tell
  • eof
  • seek
  • binmode
  • opened
  • autoflush
  • input_line_number
  • fileno
  • close
  • nextStream
  • trailingData
• Importing
• EXAMPLES
• SEE ALSO
• AUTHOR
• MODIFICATION HISTORY
• COPYRIGHT AND LICENSE

#NAME

IO::Uncompress::AnyInflate - Uncompress zlib-based (zip, gzip) file/buffer

#SYNOPSIS

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

my $status = anyinflate $input => $output [,OPTS]
    or die "anyinflate failed: $AnyInflateError\n";

my $z = new IO::Uncompress::AnyInflate $input [OPTS] 
    or die "anyinflate failed: $AnyInflateError\n";

$status = $z->read($buffer)
$status = $z->read($buffer, $length)
$status = $z->read($buffer, $length, $offset)
$line = $z->getline()
$char = $z->getc()
$char = $z->ungetc()
$char = $z->opened()

$status = $z->inflateSync()

$data = $z->trailingData()
$status = $z->nextStream()
$data = $z->getHeaderInfo()
$z->tell()
$z->seek($position, $whence)
$z->binmode()
$z->fileno()
$z->eof()
$z->close()

$AnyInflateError ;

# IO::File mode

<$z>
read($z, $buffer);
read($z, $buffer, $length);
read($z, $buffer, $length, $offset);
tell($z)
seek($z, $position, $whence)
binmode($z)
fileno($z)
eof($z)
close($z)

#DESCRIPTION

This module provides a Perl interface that allows the reading of files/buffers that have been compressed in a number of formats that use the zlib compression library.

The formats supported are

#RFC 1950

#RFC 1951 (optionally)

#gzip (RFC 1952)

#zip

The module will auto-detect which, if any, of the supported compression formats is being used.

#Functional Interface

A top-level function, anyinflate, is provided to carry out "one-shot" uncompression between buffers and/or files. For finer control over the uncompression process, see the "OO Interface" section.

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

anyinflate $input => $output [,OPTS] 
    or die "anyinflate failed: $AnyInflateError\n";

The functional interface needs Perl5.005 or better.

#anyinflate $input => $output [, OPTS]

anyinflate expects at least two parameters, $input and $output.

#The $input parameter

The parameter, $input, is used to define the source of the compressed data.

It can take one of the following forms:

#A filename

If the $input parameter is a simple scalar, it is assumed to be a filename. This file will be opened for reading and the input data will be read from it.

#A filehandle

If the $input parameter is a filehandle, the input data will be read from it. The string '-' can be used as an alias for standard input.

#A scalar reference

If $input is a scalar reference, the input data will be read from $$input.

#An array reference

If $input is an array reference, each element in the array must be a filename.

The input data will be read from each file in turn.

The complete array will be walked to ensure that it only contains valid filenames before any data is uncompressed.

#An Input FileGlob string

If $input is a string that is delimited by the characters "<" and ">" anyinflate will assume that it is an input fileglob string. The input is the list of files that match the fileglob.

If the fileglob does not match any files ...

See File::GlobMapper for more details.

If the $input parameter is any other type, undef will be returned.

#The $output parameter

The parameter $output is used to control the destination of the uncompressed data. This parameter can take one of these forms.

#A filename

If the $output parameter is a simple scalar, it is assumed to be a filename. This file will be opened for writing and the uncompressed data will be written to it.

#A filehandle

If the $output parameter is a filehandle, the uncompressed data will be written to it. The string '-' can be used as an alias for standard output.

#A scalar reference

If $output is a scalar reference, the uncompressed data will be stored in $$output.

#An Array Reference

If $output is an array reference, the uncompressed data will be pushed onto the array.

#An Output FileGlob

If $output is a string that is delimited by the characters "<" and ">" anyinflate will assume that it is an output fileglob string. The output is the list of files that match the fileglob.

When $output is an fileglob string, $input must also be a fileglob string. Anything else is an error.

If the $output parameter is any other type, undef will be returned.

#Notes

When $input maps to multiple compressed files/buffers and $output is a single file/buffer, after uncompression $output will contain a concatenation of all the uncompressed data from each of the input files/buffers.

#Optional Parameters

Unless specified below, the optional parameters for anyinflate, OPTS, are the same as those used with the OO interface defined in the "Constructor Options" section below.

#AutoClose => 0|1

This option applies to any input or output data streams to anyinflate that are filehandles.

If AutoClose is specified, and the value is true, it will result in all input and/or output filehandles being closed once anyinflate has completed.

This parameter defaults to 0.

#BinModeOut => 0|1

When writing to a file or filehandle, set binmode before writing to the file.

Defaults to 0.

#Append => 0|1

TODO

#MultiStream => 0|1

If the input file/buffer contains multiple compressed data streams, this option will uncompress the whole lot as a single data stream.

Defaults to 0.

#TrailingData => $scalar

Returns the data, if any, that is present immediately after the compressed data stream once uncompression is complete.

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, trailingData will return everything from the end of the compressed data stream to the end of the buffer.

If the input is a filehandle, 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 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 trailingData by setting the InputLength option.

#Examples

To read the contents of the file file1.txt.Compressed and write the compressed data to the file file1.txt.

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

my $input = "file1.txt.Compressed";
my $output = "file1.txt";
anyinflate $input => $output
    or die "anyinflate failed: $AnyInflateError\n";

To read from an existing Perl filehandle, $input, and write the uncompressed data to a buffer, $buffer.

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

my $input = new IO::File "<file1.txt.Compressed"
    or die "Cannot open 'file1.txt.Compressed': $!\n" ;
my $buffer ;
anyinflate $input => \$buffer 
    or die "anyinflate failed: $AnyInflateError\n";

To uncompress all files in the directory "/my/home" that match "*.txt.Compressed" and store the compressed data in the same directory

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

anyinflate '</my/home/*.txt.Compressed>' => '</my/home/#1.txt>'
    or die "anyinflate failed: $AnyInflateError\n";

and if you want to compress each file one at a time, this will do the trick

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

for my $input ( glob "/my/home/*.txt.Compressed" )
{
    my $output = $input;
    $output =~ s/.Compressed// ;
    anyinflate $input => $output 
        or die "Error compressing '$input': $AnyInflateError\n";
}

#OO Interface

#Constructor

The format of the constructor for IO::Uncompress::AnyInflate is shown below

my $z = new IO::Uncompress::AnyInflate $input [OPTS]
    or die "IO::Uncompress::AnyInflate failed: $AnyInflateError\n";

Returns an IO::Uncompress::AnyInflate object on success and undef on failure. The variable $AnyInflateError will contain an error message on failure.

If you are running Perl 5.005 or better the object, $z, returned from IO::Uncompress::AnyInflate can be used exactly like an IO::File filehandle. This means that all normal input file operations can be carried out with $z. For example, to read a line from a compressed file/buffer you can use either of these forms

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

The mandatory parameter $input is used to determine the source of the compressed data. This parameter can take one of three forms.

#A filename

If the $input parameter is a scalar, it is assumed to be a filename. This file will be opened for reading and the compressed data will be read from it.

#A filehandle

If the $input parameter is a filehandle, the compressed data will be read from it. The string '-' can be used as an alias for standard input.

#A scalar reference

If $input is a scalar reference, the compressed data will be read from $$output.

#Constructor Options

The option names defined below are case insensitive and can be optionally prefixed by a '-'. So all of the following are valid

-AutoClose
-autoclose
AUTOCLOSE
autoclose

OPTS is a combination of the following options:

#