Rails - Jul 2008 - Halt file upload if maximum size is reached. Is that possible?

Hi guys.
I''m building a rapidshare-like app, and as such each user has a disk
quota. It''s possible to prevent a file save if it exceeds the free
space, but I searched for an way to do the same _during_ the file
upload. Using flash it''s apparently possible, but I don''t want
to use
flash.

One way to do it is via Apache configuration.

But, is there any other way to stop the transfer?

I considered attachment_fu, which says in its config:
"validates_as_attachment --  This method prevents files outside of the
valid range (:min_size to :max_size, or the :size range) from being
saved.  It does not however, halt the upload of such files.  They will
be uploaded into memory regardless of size before validation."
So, in attachment_fu, this isn''t possible.

MAX_FILE_SIZE worked for PHP, but for Rails, apparently it doesn''t.

Thanks in advance for any help,

Paulo Pereira
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