Commit 6c9a1deb authored by Eli Zaretskii's avatar Eli Zaretskii

Fix visiting and saving UTF-16 encoded XML files

* lisp/international/mule.el (sgml-xml-auto-coding-function):
When the 'enncoding' tag specifies a UTF-16 encoding, enforce
saving the buffer with BOM, per the XML spec.
(xml-find-file-coding-system): Recognize UTF-16 encodings with
BOM.  (Bug#35766)  (Bug#8282)
* lisp/international/mule-cmds.el (select-safe-coding-system):
Don't consider UTF-16 encodings with and without BOM as
"different", so as not to annoy users with redundant questions
about mismatch between the XML/SGML header and the selected
explicit encoding.
parent d0b72dbb
Pipeline #1712 failed with stage
in 52 minutes
......@@ -1029,7 +1029,13 @@ It is highly recommended to fix it before writing to a file."
;; This check perhaps isn't ideal, but is probably
;; the best thing to do.
(not (auto-coding-alist-lookup (or file buffer-file-name "")))
(not (coding-system-equal coding-system auto-cs)))
(not (coding-system-equal coding-system auto-cs))
;; coding-system-equal barfs on 'charset'.
(or (equal (coding-system-type auto-cs) 'charset)
(equal (coding-system-type coding-system) 'charset)
(not (coding-system-equal (coding-system-type auto-cs)
(unless (yes-or-no-p
(format "Selected encoding %s disagrees with \
%s specified by file contents. Really save (else edit coding cookies \
......@@ -2498,7 +2498,18 @@ This function is intended to be added to `auto-coding-functions'."
(when end
(if (re-search-forward "encoding=[\"']\\(.+?\\)[\"']" end t)
(let* ((match (match-string 1))
(sym (intern (downcase match))))
(sym-name (downcase match))
;; says:
;; "Entities encoded in UTF-16 MUST [...] begin
;; with the Byte Order Mark." The trick below is
;; based on the fact that utf-16be/le don't
;; specify BOM, while utf-16-be/le do.
((equal sym-name "utf-16le") "utf-16-le")
((equal sym-name "utf-16be") "utf-16-be")
(t sym-name)))
(sym (intern sym-name)))
(if (coding-system-p sym)
;; If the encoding tag is UTF-8 and the buffer's
;; encoding is one of the variants of UTF-8, use the
......@@ -2587,9 +2598,14 @@ added by processing software."
(let ((detected
(with-coding-priority '(utf-8)
(detect-coding-region (point-min) (point-max) t)))))
;; Pure ASCII always comes back as undecided.
(detect-coding-region (point-min) (point-max) t))))
(bom (list (char-after 1) (char-after 2))))
((equal bom '(#xFE #xFF))
((equal bom '(#xFF #xFE))
;; Pure ASCII always comes back as undecided.
((memq detected '(utf-8 undecided))
((eq detected 'utf-16le-with-signature) 'utf-16le-with-signature)
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