Hi,

>> On Sun, 13 Oct 2002 19:27:05 +0200
>> Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai Gro.AN_johann) said as follows:

>> I am worry that all functions which call nnheader-parse-head() must
>> unfold continuation lines before calling it.  If this observation
>> is right, a better approach would be to make nnheader-parse-head()
>> unfold them.

>I think this is a good idea.

I see.

I think that related changes can be splited into 2 parts.

The first part is installed to nnheader.el.  This change introduces
some new functions and makes nnheader-parse-head() unfold continuation
lines.

        nnheader.el (nnheader-parse-naked-head): New function.
        (nnheader-parse-head): Use the above function, in order to
        handle continuation lines properly.
        (nnheader-remove-body): New function.
        (nnheader-remove-cr-followed-by-lf): New function.
        (nnheader-ms-strip-cr): Use the above function.

I hope that this change can be installed to Gnus without ill effects.
However, I suppose that it makes Gnus slow, because the new version of
nnheader-parse-head() copies headers to temporary buffer in order to
avoid side effects.

The second part is required to reduce excessive header copy.  I hope
that these changes will make Gnus as fast as the older version.

        gnus-agent.el (gnus-agent-regenerate-group): Call
        `nnheader-remove-body'; Use `nnheader-parse-naked-head'
        instead of `nnheader-parse-head'.
        gnus-cache.el (gnus-cache-possibly-enter-article): Ditto.
        gnus-msg.el (gnus-inews-yank-articles): Do not unfold
        continuation lines by itself;  Call `nnheader-parse-naked-head'
        instead of `nnheader-parse-head'.
        nndiary.el (nndiary-parse-head): Ditto.
        nnfolder.el (nnfolder-parse-head): Ditto.
        nnimap.el (nnimap-retrieve-headers-progress): Ditto.
        nnmaildir.el (nnmaildir--update-nov): Ditto.
        nnml.el (nnml-parse-head): Ditto.

I checked changes of gnus-cache.el and nnml.el, but the other changes
are not tested.

Thanks to Mr. Yamaoka for his advices about these changes.