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PDF::API2::Basic::PDF:UsertContributed Perl DoPDF::API2::Basic::PDF::Filter(3)

NAME
       PDF::API2::Basic::PDF::Filter - Abstract superclass for PDF stream
       filters

SYNOPSIS
	   $f = PDF::API2::Basic::PDF::Filter->new;
	   $str = $f->outfilt($str, 1);
	   print OUTFILE $str;

	   while (read(INFILE, $dat, 4096))
	   { $store .= $f->infilt($dat, 0); }
	   $store .= $f->infilt("", 1);

DESCRIPTION
       A Filter object contains state information for the process of
       outputting and inputting data through the filter. The precise state
       information stored is up to the particular filter and may range from
       nothing to whole objects created and destroyed.

       Each filter stores different state information for input and output and
       thus may handle one input filtering process and one output filtering
       process at the same time.

METHODS
   PDF::API2::Basic::PDF::Filter->new
       Creates a new filter object with empty state information ready for
       processing data both input and output.

   $dat = $f->infilt($str, $isend)
       Filters from output to input the data. Notice that $isend == 0 implies
       that there is more data to come and so following it $f may contain
       state information (usually due to the break-off point of $str not being
       tidy). Subsequent calls will incorporate this stored state information.

       $isend == 1 implies that there is no more data to follow. The final
       state of $f will be that the state information is empty. Error messages
       are most likely to occur here since if there is required state
       information to be stored following this data, then that would imply an
       error in the data.

   $str = $f->outfilt($dat, $isend)
       Filter stored data ready for output. Parallels "infilt".

NAME
       PDF::API2::Basic::PDF::ASCII85Decode - Ascii85 filter for PDF streams.
       Inherits from PDF::API2::Basic::PDF::Filter

NAME
       PDF::API2::Basic::PDF::RunLengthDecode - Run Length encoding filter for
       PDF streams. Inherits from PDF::API2::Basic::PDF::Filter

NAME
       PDF::API2::Basic::PDF::ASCIIHexDecode - Ascii Hex encoding (very
       inefficient) for PDF streams.  Inherits from
       PDF::API2::Basic::PDF::Filter

perl v5.14.1			  2011-01-24  PDF::API2::Basic::PDF::Filter(3)

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