trunk/fetchcrl/base64.pm

#
# Library inspired by the Perl 4 code from base64.pl by A. P. Barrett 
# <barrett@ee.und.ac.za>, October 1993, and subsequent changes by 
# Earl Hood <earl@earlhood.com> to use MIME::Base64 if available.
#

package base64;

my $use_MIMEBase64 = eval { require MIME::Base64; };

sub b64decode
{
    return &MIME::Base64::decode_base64(@_) if $use_MIMEBase64;

    local($^W) = 0;
    use integer; # should be faster and more accurate

    ( my $str = shift ) =~ tr|A-Za-z0-9+=/||cd;
    $str =~ s/=+$//;
    $str =~ tr|A-Za-z0-9+/| -_|; # collapse base64 unto continuous set of chars
                                 # (by convention the uuencode set, for unpack)

    return "" unless $str;
    return unpack("u", join('', map( chr(32 + length($_)*3/4) . $_,
                                $str =~ /(.{1,60})/gs) ) );
}

sub b64encode
{
    return &MIME::Base64::encode_base64(@_) if $use_MIMEBase64;

    local ($_) = shift;
    local($^W) = 0;
    use integer; # should be faster and more accurate
    
    my $result = pack("u", $_[0]);
    $result =~ s/^.//mg;
    $result =~ s/\n//g;

    $result =~ tr| -_|A-Za-z0-9+/|;
    my $padding = (3 - length($_[0]) % 3) % 3;

    $result =~ s/.{$padding}$/'=' x $padding/e if $padding;
    if (length $eol) {
        $result =~ s/(.{1,76})/$1$eol/g;
    }
    return $result;
}

1;
1	davidg	1758	#
2	davidg	1768	# Library inspired by the Perl 4 code from base64.pl by A. P. Barrett
3			# <barrett@ee.und.ac.za>, October 1993, and subsequent changes by
4			# Earl Hood <earl@earlhood.com> to use MIME::Base64 if available.
5	davidg	1758	#
6
7			package base64;
8
9	davidg	1768	my $use_MIMEBase64 = eval { require MIME::Base64; };
10	davidg	1758
11			sub b64decode
12			{
13	davidg	1768	return &MIME::Base64::decode_base64(@_) if $use_MIMEBase64;
14	davidg	1758
15	davidg	1768	local($^W) = 0;
16			use integer; # should be faster and more accurate
17	davidg	1758
18	davidg	1768	( my $str = shift ) =~ tr\|A-Za-z0-9+=/\|\|cd;
19			$str =~ s/=+$//;
20			$str =~ tr\|A-Za-z0-9+/\| -_\|; # collapse base64 unto continuous set of chars
21			# (by convention the uuencode set, for unpack)
22	davidg	1758
23	davidg	1768	return "" unless $str;
24			return unpack("u", join('', map( chr(32 + length($_)*3/4) . $_,
25			$str =~ /(.{1,60})/gs) ) );
26	davidg	1758	}
27
28			sub b64encode
29			{
30	davidg	1768	return &MIME::Base64::encode_base64(@_) if $use_MIMEBase64;
31	davidg	1758
32			local ($_) = shift;
33	davidg	1768	local($^W) = 0;
34			use integer; # should be faster and more accurate
35	davidg	1758
36	davidg	1768	my $result = pack("u", $_[0]);
37			$result =~ s/^.//mg;
38			$result =~ s/\n//g;
39	davidg	1758
40	davidg	1768	$result =~ tr\| -_\|A-Za-z0-9+/\|;
41			my $padding = (3 - length($_[0]) % 3) % 3;
42	davidg	1758
43	davidg	1768	$result =~ s/.{$padding}$/'=' x $padding/e if $padding;
44			if (length $eol) {
45			$result =~ s/(.{1,76})/$1$eol/g;
46	davidg	1758	}
47	davidg	1768	return $result;
48	davidg	1758	}
49
50			1;
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