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Re^2: Simplest Way to Edit EML Files?

by Jim (Curate)
on Jun 17, 2013 at 18:25 UTC ( #1039438=note: print w/replies, xml ) Need Help??

in reply to Re: Simplest Way to Edit EML Files?
in thread Simplest Way to Edit EML Files?

Thanks for your reply, CountZero.

The reason I posted an inquiry on PerlMonks before I delved into using Email::Simple is because it wasn't obvious to me from its documentation whether it could be used to edit EML files in place (effectively, at least). I needed to make small changes to many EML files, but I didn't want to have to construct whole Internet mail messages anew. And it takes me longer than it probably takes most Perl programmers to learn to use a new module.

It turns out I don't have to repair the EML files after all. But I do have to extract the character encoding damaged text from them and make a best effort to reverse the corruption. (See How to Fix Character Encoding Damaged Text Using Perl?.) I was able to determine that, in my finite collection of EML files, the damaged text is consistently in the same format, so matching the pattern was trivial using a regular expression. The script I wrote is included below.

#!perl use v5.14; use Encode qw( encode decode ); use MIME::Base64; binmode STDOUT, ':encoding(UTF-8)'; local $, = "\t"; local $\ = "\n"; @ARGV = <@ARGV>; # Expand wildcards... LINE: while (<>) { next LINE unless m{ ^(\S+): # field name \s+ =[?]utf-8[?]B[?] ([^?]+) # base64 encoded text [?]= }ix; my ($field_name, $base64_encoded_text) = ($1, $2); my $base64_decoded_text = decode_base64($base64_encoded_text); my $utf8_decoded_text = decode('UTF-8', $base64_decoded_text); next LINE unless $utf8_decoded_text =~ m{ [^\p{Script=Common}\p{Script=Latin}] }x; my $damaged_text = $utf8_decoded_text; my $repaired_text = decode('UTF-8', encode('UCS-2LE', $damaged_text)); $repaired_text =~ s{\x{00}+$}{}; print $ARGV, $field_name, $repaired_text, $damaged_text; } exit 0;

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