Convert 7bit text to plain text perl - perl

Question

I parsing email message and i found part with encoding: 7bit
how a can convert text of this part to plain text?
i use perl

Answer 1

Content-Transfer-Encoding: 7bit
means that the text is already plain old ASCII text. No conversion is necessary. (Well, unless the Content-Type header indicates a non-ASCII-based charset, but those are pretty rare, especially with 7bit text.)

Answer 2

It sounds like you have UU-encoded data (older method) or MIME-encoded. To deal with that, you can use Convert::UU and MIME::Base64 CPAN modules respectively.
To use MIME::Base64 (or its pure-Perl implementation, MIME::Base64::Perl):
use MIME::Base64::Perl;
my $decoded = decode_base64($encoded);
How do you know the difference?
The modern MIME encoded text looks like this (Especially pay attention to MIME-Version: header which tells you it's MIME-encoded as well as Content-Transfer-Encoding header which tells you the encoding base - if it's not base64, you need a different CPAN module:
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="frontier"
This is a message with multiple parts in MIME format.
--frontier
Content-Type: text/plain
This is the body of the message.
--frontier
Content-Type: application/octet-stream
Content-Transfer-Encoding: base64
UU-encoded text would look something like:
begin 644 cat.txt
#0V%T
`
end
If the encoded data looks differently than either of the above samples, please post the exact format so we can determine what it is.