FAQ 9.18 How do I decode a MIME/BASE64 string?
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From: PerlFAQ Server on 5 Mar 2010 18:00 This is an excerpt from the latest version perlfaq9.pod, which comes with the standard Perl distribution. These postings aim to reduce the number of repeated questions as well as allow the community to review and update the answers. The latest version of the complete perlfaq is at http://faq.perl.org . -------------------------------------------------------------------- 9.18: How do I decode a MIME/BASE64 string? The MIME-Base64 package (available from CPAN) handles this as well as the MIME/QP encoding. Decoding BASE64 becomes as simple as: use MIME::Base64; $decoded = decode_base64($encoded); The MIME-Tools package (available from CPAN) supports extraction with decoding of BASE64 encoded attachments and content directly from email messages. If the string to decode is short (less than 84 bytes long) a more direct approach is to use the unpack() function's "u" format after minor transliterations: tr#A-Za-z0-9+/##cd; # remove non-base64 chars tr#A-Za-z0-9+/# -_#; # convert to uuencoded format $len = pack("c", 32 + 0.75*length); # compute length byte print unpack("u", $len . $_); # uudecode and print -------------------------------------------------------------------- The perlfaq-workers, a group of volunteers, maintain the perlfaq. They are not necessarily experts in every domain where Perl might show up, so please include as much information as possible and relevant in any corrections. The perlfaq-workers also don't have access to every operating system or platform, so please include relevant details for corrections to examples that do not work on particular platforms. Working code is greatly appreciated. If you'd like to help maintain the perlfaq, see the details in perlfaq.pod. |