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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //usr/share/perl5/vendor_perl/Digest/base.pm

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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