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.\" ========================================================================
.\"
.IX Title "Text::PDF::Filter 3pm"
.TH Text::PDF::Filter 3pm "2021-01-02" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
PDF::Filter \- Abstract superclass for PDF stream filters
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    $f = Text::PDF::Filter\->new;
\&    $str = $f\->outfilt($str, 1);
\&    print OUTFILE $str;
\&    
\&    while (read(INFILE, $dat, 4096))
\&    { $store .= $f\->infilt($dat, 0); }
\&    $store .= $f\->infilt("", 1);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
A Filter object contains state information for the process of outputting
and inputting data through the filter. The precise state information stored
is up to the particular filter and may range from nothing to whole objects
created and destroyed.
.PP
Each filter stores different state information for input and output and thus
may handle one input filtering process and one output filtering process at
the same time.
.SH "METHODS"
.IX Header "METHODS"
.SS "Text::PDF::Filter\->new"
.IX Subsection "Text::PDF::Filter->new"
Creates a new filter object with empty state information ready for processing
data both input and output.
.ie n .SS "$dat = $f\->infilt($str, $isend)"
.el .SS "\f(CW$dat\fP = \f(CW$f\fP\->infilt($str, \f(CW$isend\fP)"
.IX Subsection "$dat = $f->infilt($str, $isend)"
Filters from output to input the data. Notice that \f(CW$isend\fR == 0 implies that there
is more data to come and so following it \f(CW$f\fR may contain state information
(usually due to the break-off point of \f(CW$str\fR not being tidy). Subsequent calls
will incorporate this stored state information.
.PP
\&\f(CW$isend\fR == 1 implies that there is no more data to follow. The
final state of \f(CW$f\fR 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.
.ie n .SS "$str = $f\->outfilt($dat, $isend)"
.el .SS "\f(CW$str\fP = \f(CW$f\fP\->outfilt($dat, \f(CW$isend\fP)"
.IX Subsection "$str = $f->outfilt($dat, $isend)"
Filter stored data ready for output. Parallels \f(CW\*(C`infilt\*(C'\fR.
.SH "NAME"
Text::PDF::ASCII85Decode \- Ascii85 filter for PDF streams. Inherits from
Text::PDF::Filter
.SH "NAME"
Text::PDF::RunLengthDecode \- Run Length encoding filter for PDF streams. Inherits from
Text::PDF::Filter
.SH "NAME"
Text::PDF::ASCIIHexDecode \- Ascii Hex encoding (very inefficient) for PDF streams.
Inherits from Text::PDF::Filter