bug#34469: 26.1; EWW stops renderring web page on null byte

[Robert Pluim]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Robert Pluim <rpluim@gmail.com>
>> Cc: 34469@debbugs.gnu.org,  nicholasdrozd@gmail.com
>> Date: Tue, 19 Feb 2019 18:37:26 +0100
>> 
>> Since this is all due to a C-ism in the handling of content, Iʼd vote
>> for "\0", although this is inside Emacs, so perhaps "^@" is best.
>
> Either is fine with me.

Since the web page that triggered this was showing C code, Iʼve gone
for the "\0" option.

2019-02-20  Robert Pluim  <rpluim@gmail.com>

        * lisp/net/eww.el (eww-display-html): Replace NULL characters with
        "\0", as libxml can't handle embedded NULLs.
diff --git i/lisp/net/eww.el w/lisp/net/eww.el
index 555b3bd591..06075b1ebd 100644
--- i/lisp/net/eww.el
+++ w/lisp/net/eww.el
@@ -462,10 +462,12 @@ eww-display-html
                (condition-case nil
                    (decode-coding-region (point) (point-max) encode)
                  (coding-system-error nil))
-                (save-excursion
-                  ;; Remove CRLF before parsing.
-                  (while (re-search-forward "\r$" nil t)
-                    (replace-match "" t t)))
+               (save-excursion
+                 ;; Remove CRLF and NULL before parsing.
+                  (while (re-search-forward "\\(\r$\\)\\|\\(\000\\)" nil t)
+                    (replace-match (if (match-beginning 1)
+                                       ""
+                                     "\\0") t t)))
                (libxml-parse-html-region (point) (point-max))))))
        (source (and (null document)
                     (buffer-substring (point) (point-max)))))