MIME::Base64 is a very small module, and the encode method is particularly small, since pack() does most of the work. They use pack to create a uuencoded string, then tr// to translate from the uuencode charset to the Base64 charset: Copying the source, then, with a few minor modifications 
sub b6464 {
    my $orig=shift;
    my $string = pack("u",$orig);
    $string =~ s/^.//mg;
    $string =~ s/\n//g;
    # use tr to translate from UUE to Base64
    $string =~ tr|` -_|AA-Za-z0-9+/|;
    # fix padding at the end
    my $padding = (3 - length($orig) % 3) % 3;
    $string =~ s/.{$padding}$/'=' x $padding/e if $padding;
    # break string into lines of 64 chars or less
    $string =~ s/(.{1,64})/$1\n/g;
    return $string;
}

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In reply to Re: How to generate 64-character length lines in base64? by kschwab
in thread How to generate 64-character length lines in base64? by rmichael

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