/[pdpsoft]/nl.nikhef.pdp.fetchcrl/tags/fetch-crl-3.0.8-1/base64.pm
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Revision 1768 - (show annotations) (download) (as text)
Fri Jun 11 19:45:08 2010 UTC (11 years, 5 months ago) by davidg
Original Path: trunk/fetchcrl/base64.pm
File MIME type: application/x-perl
File size: 1326 byte(s)
rewrite of this helper module to make sure it its with the copyright

1 #
2 # 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 #
6
7 package base64;
8
9 my $use_MIMEBase64 = eval { require MIME::Base64; };
10
11 sub b64decode
12 {
13 return &MIME::Base64::decode_base64(@_) if $use_MIMEBase64;
14
15 local($^W) = 0;
16 use integer; # should be faster and more accurate
17
18 ( 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
23 return "" unless $str;
24 return unpack("u", join('', map( chr(32 + length($_)*3/4) . $_,
25 $str =~ /(.{1,60})/gs) ) );
26 }
27
28 sub b64encode
29 {
30 return &MIME::Base64::encode_base64(@_) if $use_MIMEBase64;
31
32 local ($_) = shift;
33 local($^W) = 0;
34 use integer; # should be faster and more accurate
35
36 my $result = pack("u", $_[0]);
37 $result =~ s/^.//mg;
38 $result =~ s/\n//g;
39
40 $result =~ tr| -_|A-Za-z0-9+/|;
41 my $padding = (3 - length($_[0]) % 3) % 3;
42
43 $result =~ s/.{$padding}$/'=' x $padding/e if $padding;
44 if (length $eol) {
45 $result =~ s/(.{1,76})/$1$eol/g;
46 }
47 return $result;
48 }
49
50 1;

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