1Text::PDF::Filter(3)  User Contributed Perl Documentation Text::PDF::Filter(3)
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NAME

6       PDF::Filter - Abstract superclass for PDF stream filters
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SYNOPSIS

9           $f = Text::PDF::Filter->new;
10           $str = $f->outfilt($str, 1);
11           print OUTFILE $str;
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13           while (read(INFILE, $dat, 4096))
14           { $store .= $f->infilt($dat, 0); }
15           $store .= $f->infilt("", 1);
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DESCRIPTION

18       A Filter object contains state information for the process of
19       outputting and inputting data through the filter. The precise state
20       information stored is up to the particular filter and may range from
21       nothing to whole objects created and destroyed.
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23       Each filter stores different state information for input and output and
24       thus may handle one input filtering process and one output filtering
25       process at the same time.
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METHODS

28   Text::PDF::Filter->new
29       Creates a new filter object with empty state information ready for
30       processing data both input and output.
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32   $dat = $f->infilt($str, $isend)
33       Filters from output to input the data. Notice that $isend == 0 implies
34       that there is more data to come and so following it $f may contain
35       state information (usually due to the break-off point of $str not being
36       tidy). Subsequent calls will incorporate this stored state information.
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38       $isend == 1 implies that there is no more data to follow. The final
39       state of $f will be that the state information is empty. Error messages
40       are most likely to occur here since if there is required state
41       information to be stored following this data, then that would imply an
42       error in the data.
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44   $str = $f->outfilt($dat, $isend)
45       Filter stored data ready for output. Parallels "infilt".
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NAME

48       Text::PDF::ASCII85Decode - Ascii85 filter for PDF streams. Inherits
49       from Text::PDF::Filter
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NAME

52       Text::PDF::RunLengthDecode - Run Length encoding filter for PDF
53       streams. Inherits from Text::PDF::Filter
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NAME

56       Text::PDF::ASCIIHexDecode - Ascii Hex encoding (very inefficient) for
57       PDF streams.  Inherits from Text::PDF::Filter
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61perl v5.32.1                      2021-01-27              Text::PDF::Filter(3)
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