I'm trying to implement a standard protocol (RETS, to be specific) which defines certain responses as MIME multipart/parallel entities with CR/LF line endings for headers, with some MIME entities containing binary data. I'm trying to get CR/LF line endings out of MIME::Entity, but it's full of hardcoded \n characters, and so far I don't have a solution I'm happy with. Here's what I've tried:

• Writing the MIME entity to a filehandle with the :crlf PerlIO layer enabled. The binary parts get mangled by :crlf, and also the Content-length header ends up incorrect.
• Editing MIME::Entity and MIME::Head on my system. This is difficult to maintain, especially if I try to install the code on another machine.
• Subclassing MIME::Entity and MIME::Head to output CR/LF line endings. There are unfortunately a lot of places where \n is hardcoded in, and other places where MIME::Head objects are created explicitly, which must be replaced with my special subclass. I end up duplicating large blocks of code just to change a few variables, and I'm afraid this will be just as difficult to maintain as customized local copies, and also fragile when the MIME modules are upgraded.

Does anybody have any other suggestions? Thanks!

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