/usr/share/doc/libxml-libxml-perl/examples/cb_example.pl is in libxml-libxml-perl 1.89+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | use strict;
use warnings;
use XML::LibXML;
use IO::File;
# first instanciate the parser
my $parser = XML::LibXML->new();
# initialize the callbacks
$parser->match_callback( \&match_uri );
$parser->read_callback( \&read_uri );
$parser->open_callback( \&open_uri );
$parser->close_callback( \&close_uri );
# include XIncludes on the fly
$parser->expand_xinclude( 1 );
# parse the file "text.xml" in the current directory
my $dom = $parser->parse_file("test.xml");
print $dom->toString() , "\n";
# the callbacks follow
# these callbacks are used for both the original parse AND the XInclude
sub match_uri {
my $uri = shift;
return $uri !~ /:\/\// ? 1 : 0; # we handle only files
}
sub open_uri {
my $uri = shift;
my $handler = new IO::File;
if ( not $handler->open( "<$uri" ) ){
$handler = 0;
}
return $handler;
}
sub read_uri {
my $handler = shift;
my $length = shift;
my $buffer = undef;
if ( $handler ) {
$handler->read( $buffer, $length );
}
return $buffer;
}
sub close_uri {
my $handler = shift;
if ( $handler ) {
$handler->close();
}
return 1;
}
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