* bug#30664: 25.2; eww-download corrupts PDF files (and probably other binary files too)
@ 2018-03-01 15:58 omar.antolin
2018-03-01 17:10 ` Andreas Schwab
2018-03-01 19:17 ` Eli Zaretskii
0 siblings, 2 replies; 5+ messages in thread
From: omar.antolin @ 2018-03-01 15:58 UTC (permalink / raw)
To: 30664
I tried using eww-download (bound to `d` in eww buffers) to download a
PDF file. This produced, as expected a file in my downloads directory,
but I could not open it in my PDF reader. I immediately suspected that
Emacs had done some unwanted coding system translation on the PDF file.
The variable `last-coding-system-used` was set to `raw-text-dos` (I'm
using Emacs 25.2 on Windows 10), and the `dos` part sounded suspicious
to me. Adding the item `("\\.pdf\\'" no-conversion . no-conversion)` to
the variable `file-coding-system-alist` and redownloading the file fixed
the problem and produced a valid PDF file.
I'm not sure adding that entry to the default value of
`file-coding-system-alist` is the right way to solve this problem
though, because where does it stop? Would we add all known binary file
types to the list with `no-conversion` specifications? I think it
might be best to modify the function `eww-download-callback` to
save the downloaded file with no-conversion either always or in certain
cases. Maybe the HTTP response can be inspected and if the type is not
text/something to use no-conversion.
In GNU Emacs 25.2.1 (i686-w64-mingw32)
of 2017-04-24 built on LAPHROAIG
Windowing system distributor 'Microsoft Corp.', version 10.0.16299
Configured using:
'configure --host=i686-w64-mingw32 --without-dbus
--without-compress-install 'CFLAGS=-static -O2 -g3''
Configured features:
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override-global-mode: t
tooltip-mode: t
global-eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
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auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
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Features:
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eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
dos-w32 ls-lisp disp-table w32-win w32-vars term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame
cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote w32notify w32 multi-tty
make-network-process emacs)
Memory information:
((conses 8 346633 45907)
(symbols 32 39136 0)
(miscs 32 154 602)
(strings 16 91623 67578)
(string-bytes 1 2621517)
(vectors 8 42157)
(vector-slots 4 1449017 44142)
(floats 8 541 810)
(intervals 28 531 1239)
(buffers 520 48))
^ permalink raw reply [flat|nested] 5+ messages in thread* bug#30664: 25.2; eww-download corrupts PDF files (and probably other binary files too)
2018-03-01 15:58 bug#30664: 25.2; eww-download corrupts PDF files (and probably other binary files too) omar.antolin
@ 2018-03-01 17:10 ` Andreas Schwab
2018-03-01 19:18 ` Eli Zaretskii
2018-03-01 19:17 ` Eli Zaretskii
1 sibling, 1 reply; 5+ messages in thread
From: Andreas Schwab @ 2018-03-01 17:10 UTC (permalink / raw)
To: omar.antolin; +Cc: 30664
On Mär 01 2018, omar.antolin@gmail.com wrote:
> I tried using eww-download (bound to `d` in eww buffers) to download a
> PDF file. This produced, as expected a file in my downloads directory,
> but I could not open it in my PDF reader. I immediately suspected that
> Emacs had done some unwanted coding system translation on the PDF file.
>
> The variable `last-coding-system-used` was set to `raw-text-dos` (I'm
> using Emacs 25.2 on Windows 10), and the `dos` part sounded suspicious
> to me. Adding the item `("\\.pdf\\'" no-conversion . no-conversion)` to
> the variable `file-coding-system-alist` and redownloading the file fixed
> the problem and produced a valid PDF file.
>
> I'm not sure adding that entry to the default value of
> `file-coding-system-alist` is the right way to solve this problem
> though, because where does it stop? Would we add all known binary file
> types to the list with `no-conversion` specifications?
I think it's only a problem because PDF files look like text files.
Other binary files are immediately recognized as binary.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
^ permalink raw reply [flat|nested] 5+ messages in thread* bug#30664: 25.2; eww-download corrupts PDF files (and probably other binary files too)
2018-03-01 17:10 ` Andreas Schwab
@ 2018-03-01 19:18 ` Eli Zaretskii
0 siblings, 0 replies; 5+ messages in thread
From: Eli Zaretskii @ 2018-03-01 19:18 UTC (permalink / raw)
To: Andreas Schwab; +Cc: 30664, omar.antolin
> From: Andreas Schwab <schwab@suse.de>
> Date: Thu, 01 Mar 2018 18:10:34 +0100
> Cc: 30664@debbugs.gnu.org
>
> I think it's only a problem because PDF files look like text files.
> Other binary files are immediately recognized as binary.
You are right, but I think a download function should produce a file
that is identical to its original, even if it's a text file. No
coding conversions or EOL conversions should take place.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#30664: 25.2; eww-download corrupts PDF files (and probably other binary files too)
2018-03-01 15:58 bug#30664: 25.2; eww-download corrupts PDF files (and probably other binary files too) omar.antolin
2018-03-01 17:10 ` Andreas Schwab
@ 2018-03-01 19:17 ` Eli Zaretskii
[not found] ` <CAL03oyLjOiFtdiY+_OCHHSSzn+7iEepZAHq08fOvMiN2HhLpqQ@mail.gmail.com>
1 sibling, 1 reply; 5+ messages in thread
From: Eli Zaretskii @ 2018-03-01 19:17 UTC (permalink / raw)
To: omar.antolin; +Cc: 30664
> From: omar.antolin@gmail.com
> Date: Thu, 01 Mar 2018 09:58:30 -0600
>
>
> I tried using eww-download (bound to `d` in eww buffers) to download a
> PDF file. This produced, as expected a file in my downloads directory,
> but I could not open it in my PDF reader. I immediately suspected that
> Emacs had done some unwanted coding system translation on the PDF file.
>
> The variable `last-coding-system-used` was set to `raw-text-dos` (I'm
> using Emacs 25.2 on Windows 10), and the `dos` part sounded suspicious
> to me. Adding the item `("\\.pdf\\'" no-conversion . no-conversion)` to
> the variable `file-coding-system-alist` and redownloading the file fixed
> the problem and produced a valid PDF file.
Does the patch below fix the problem?
diff --git a/lisp/net/eww.el b/lisp/net/eww.el
index caac96a..66b1767 100644
--- a/lisp/net/eww.el
+++ b/lisp/net/eww.el
@@ -1532,7 +1532,8 @@ eww-download-callback
eww-download-directory)))
(goto-char (point-min))
(re-search-forward "\r?\n\r?\n")
- (write-region (point) (point-max) file)
+ (let ((coding-system-for-write 'no-conversion))
+ (write-region (point) (point-max) file))
(message "Saved %s" file))))
(defun eww-decode-url-file-name (string)
^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-03-02 8:46 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2018-03-01 15:58 bug#30664: 25.2; eww-download corrupts PDF files (and probably other binary files too) omar.antolin
2018-03-01 17:10 ` Andreas Schwab
2018-03-01 19:18 ` Eli Zaretskii
2018-03-01 19:17 ` Eli Zaretskii
[not found] ` <CAL03oyLjOiFtdiY+_OCHHSSzn+7iEepZAHq08fOvMiN2HhLpqQ@mail.gmail.com>
2018-03-02 8:46 ` Eli Zaretskii
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