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proc
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self
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root
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proc
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thread-self
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root
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usr
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share
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perl5
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vendor_perl
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Digest
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package Digest::base; use strict; use vars qw($VERSION); $VERSION = "1.16"; # subclass is supposed to implement at least these sub new; sub clone; sub add; sub digest; sub reset { my $self = shift; $self->new(@_); # ugly } sub addfile { my ($self, $handle) = @_; my $n; my $buf = ""; while (($n = read($handle, $buf, 4*1024))) { $self->add($buf); } unless (defined $n) { require Carp; Carp::croak("Read failed: $!"); } $self; } sub add_bits { my $self = shift; my $bits; my $nbits; if (@_ == 1) { my $arg = shift; $bits = pack("B*", $arg); $nbits = length($arg); } else { ($bits, $nbits) = @_; } if (($nbits % 8) != 0) { require Carp; Carp::croak("Number of bits must be multiple of 8 for this algorithm"); } return $self->add(substr($bits, 0, $nbits/8)); } sub hexdigest { my $self = shift; return unpack("H*", $self->digest(@_)); } sub b64digest { my $self = shift; require MIME::Base64; my $b64 = MIME::Base64::encode($self->digest(@_), ""); $b64 =~ s/=+$//; return $b64; } 1; __END__ =head1 NAME Digest::base - Digest base class =head1 SYNOPSIS package Digest::Foo; use base 'Digest::base'; =head1 DESCRIPTION The C<Digest::base> class provide implementations of the methods C<addfile> and C<add_bits> in terms of C<add>, and of the methods C<hexdigest> and C<b64digest> in terms of C<digest>. Digest implementations might want to inherit from this class to get this implementations of the alternative I<add> and I<digest> methods. A minimal subclass needs to implement the following methods by itself: new clone add digest The arguments and expected behaviour of these methods are described in L<Digest>. =head1 SEE ALSO L<Digest>
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