@synindex fn cp
@synindex vr cp
@synindex pg cp
-@dircategory Emacs
-@direntry
-* MIME: (emacs-mime). Emacs MIME de/composition library.
-@end direntry
-@iftex
-@finalout
-@end iftex
-@setchapternewpage odd
-
-@ifnottex
+@copying
This file documents the Emacs MIME interface functionality.
-Copyright (C) 1998,99,2000 Free Software Foundation, Inc.
+Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
+@quotation
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1 or
any later version published by the Free Software Foundation; with no
Documentation License. If you want to distribute this document
separately from the collection, you can do so by adding a copy of the
license to the document, as described in section 6 of the license.
-@end ifnottex
+@end quotation
+@end copying
-@tex
+@dircategory Emacs
+@direntry
+* MIME: (emacs-mime). Emacs MIME de/composition library.
+@end direntry
+@iftex
+@finalout
+@end iftex
+@setchapternewpage odd
@titlepage
@title Emacs MIME Manual
@author by Lars Magne Ingebrigtsen
@page
-
@vskip 0pt plus 1filll
-Copyright @copyright{} 1998,99,2000 Free Software Foundation, Inc.
-
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.1 or
-any later version published by the Free Software Foundation; with the
-Invariant Sections being none, with the Front-Cover texts being ``A GNU
-Manual'', and with the Back-Cover Texts as in (a) below. A copy of the
-license is included in the section entitled ``GNU Free Documentation
-License'' in the Emacs manual.
-
-(a) The FSF's Back-Cover Text is: ``You have freedom to copy and modify
-this GNU Manual, like GNU software. Copies published by the Free
-Software Foundation raise funds for GNU development.''
-
-This document is part of a collection distributed under the GNU Free
-Documentation License. If you want to distribute this document
-separately from the collection, you can do so by adding a copy of the
-license to the document, as described in section 6 of the license.
+@insertcopying
@end titlepage
-@page
-@end tex
@node Top
@top Emacs MIME
@defopt mm-inline-media-tests
This is an alist where the key is a @sc{mime} type, the second element
-is a function to display the part @dfn{inline} (i.e., inside Emacs), and
+is a function to display the part @dfn{inline} (i.e., inside Emacs), and
the third element is a form to be @code{eval}ed to say whether the part
can be displayed inline.
@defopt mm-attachment-override-types
Some @sc{mime} agents create parts that have a content-disposition of
-@samp{attachment}. This variable allows overriding that disposition and
+@samp{attachment}. This variable allows overriding that disposition and
displaying the part inline. (Note that the disposition is only
overridden if we are able to, and want to, display the part inline.)
@end defopt
@end lisp
We see that the function takes a @sc{mime} handle as its parameter. It
-then goes to a temporary buffer, inserts the text of the part, does some
+then goes to a temporary buffer, inserts the text of the part, does some
work on the text, stores the result, goes back to the buffer it was
called from and inserts the result.
be chosen.
@vindex mail-parse-charset
-If you are running a non-Mule Emacs, this process is simple: if the part
+@cindex unibyte Emacs
+If you are running a non-Mule XEmacs, or Emacs in unibyte
+mode@footnote{Deprecated!}, this process is simple: if the part
contains any non-@sc{ascii} (8-bit) characters, the @sc{mime} charset
given by @code{mail-parse-charset} (a symbol) is used. (Never set this
variable directly, though. If you want to change the default charset,
@sc{ascii} characters, the @sc{mime} charset @samp{US-ASCII} is used, of
course.
-@cindex Mule
-@cindex UTF-8
-@cindex Unicode
+@cindex multibyte Emacs
+@cindex @code{mime-charset} property
+In a normal (multibyte) Emacs session, a list of coding systems is
+derived that can encode the message part's content and correspond to
+MIME charsets (according to their @code{mime-charset} property). This
+list is according to the normal priority rules and the highest priority
+one is chosen to encode the part. If no such coding system can encode
+the part's contents, they are split into several parts such that each
+can be encoded with an appropriate coding system/@sc{mime}
+charset.@footnote{The part can only be split at line boundaries,
+though---if more than one @sc{mime} charset is required to encode a
+single line, it is not possible to encode the part.} Note that this
+procedure works with any correctly-defined coding systems, not just
+built-in ones. Given a suitably-defined UTF-8 coding system---one
+capable of encoding the Emacs charsets you use---it is not normally
+necessary to split a part by charset.
+
@vindex mm-mime-mule-charset-alist
-Things are slightly more complicated when running Emacs with Mule
-support. In this case, a list of the Mule charsets used in the part is
-obtained, and the corresponding @sc{mime} charsets are determined. If
-this results in a single @sc{mime} charset, this is used to encode the
-part. But if the resulting list of @sc{mime} charsets contains more
-than one element, two things can happen: if it is possible to encode the
-part via UTF-8, this charset is used. (For this, Emacs must support the
-@code{utf-8} coding system, and the part must consist entirely of
-characters which have Unicode counterparts.) If UTF-8 is not available,
-the part is split into several, so that each one can be encoded with a
-single @sc{mime} charset. The part can only be split at line
-boundaries, though---if more than one @sc{mime} charset is required to
-encode a single line, it is not possible to encode the part.
+@cindex XEmacs/Mule
+It isn't possible to do this properly in XEmacs/Mule. Instead, a list
+of the Mule charsets used in the part is obtained, and the
+corresponding @sc{mime} charsets are determined by lookup in
+@code{mm-mime-mule-charset-alist}. If the list elements all
+correspond to a single @sc{mime} charset, that is used to encode the
+part. Otherwise, the part is split as above.
@node Conversion
@section Conversion
@bye
@c End:
+
+@ignore
+ arch-tag: c7ef2fd0-a91c-4e10-aa52-c1a2b11b1a8d
+@end ignore
HCoop / bpt / emacs.git / blobdiff