NetBSD/crypto/dist/openssl/demos/b64.pl

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Perl
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#!/usr/local/bin/perl
#
# Make PEM encoded data have lines of 64 bytes of data
#
while (<>)
{
if (/^-----BEGIN/ .. /^-----END/)
{
if (/^-----BEGIN/) { $first=$_; next; }
if (/^-----END/) { $last=$_; next; }
$out.=$_;
}
}
$out =~ s/\s//g;
$out =~ s/(.{64})/$1\n/g;
print "$first$out\n$last\n";