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package PerlIO::via::MD5; |
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$VERSION= '0.07'; |
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# be as strict as possible |
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use strict; |
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# modules that we need |
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use Digest::MD5 (); # no need to pollute this namespace |
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# initializations |
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my %allowed= ( digest => 1, hexdigest => 1, b64digest => 1 ); |
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my $method= 'hexdigest'; |
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# satisfy -require- |
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1; |
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#------------------------------------------------------------------------------- |
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# |
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# Methods for settings that will be used by the objects |
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# |
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#------------------------------------------------------------------------------- |
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# IN: 1 class (ignored) |
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# 2 new setting for method |
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# OUT: 1 current setting for eol |
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sub method { |
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shift; |
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# set new value if given |
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if (@_) { |
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die "Invalid digest method '$_[0]'" unless $allowed{$_[0]}; |
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$method= shift; |
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} |
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return $method; |
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} #method |
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#------------------------------------------------------------------------------- |
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# |
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# Standard Perl features |
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# |
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#------------------------------------------------------------------------------- |
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# IN: 1 class |
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# 2 mode string (ignored) |
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# 3 file handle of PerlIO layer below (ignored) |
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# OUT: 1 blessed object |
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sub PUSHED { |
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# not reading |
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return -1 if $_[1] ne 'r'; |
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return bless [ Digest::MD5->new, $method ], $_[0]; |
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} #PUSHED |
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#------------------------------------------------------------------------------- |
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# IN: 1 instantiated object |
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# 2 handle to read from |
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# OUT: 1 empty string (when still busy) or the digest string (when done) |
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sub FILL { |
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# still reading file |
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0
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my $line= readline( $_[1] ); |
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if ( defined($line) ) { |
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$_[0]->[0]->add($line); |
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# nothing to be returned yet |
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return ''; |
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} |
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# end of data reached, we have MD5 object still |
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elsif ( $_[0]->[0] ) { |
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my ( $object, $method )= @{ $_[0] }; |
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3
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$_[0]->[0]= ''; |
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78
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# return result of digest |
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3
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return $object->$method; |
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} |
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82
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# huh?, end of data without MD5 object, empty file? |
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return undef; |
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} #FILL |
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86
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#------------------------------------------------------------------------------- |
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__END__ |