[Bug 26888] New: Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

Summary: Wine limits file names to 255 bytes even on NTFS
           Product: Wine
           Version: unspecified
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Wine limits file names to 255 bytes even when underlying file system permits
longer file names (like NTFS) when creating a file. This is an issue with
programs that can create file names that are something like 140 characters but
if one character takes 2 or 3 bytes, this 255 byte filename limit will be
evident when same files that can be created in Windows can't be created with
Wine. NTFS supports 255 UTF-16 code units that can easily result in longer file
names than 255 bytes, especially for users of Japanese systems.

You can test this by creating a NTFS file system and some files with long names
on it:

truncate -s 2g /tmp/ntfsfs
losetup /dev/loop7 /tmp/ntfsfs
mkfs.ntfs -f /dev/loop7
mkdir /tmp/ntfsfs-mnt
mount -t ntfs-3g /dev/loop7 /tmp/ntfsfs-mnt
# Do this or whatever enables regular user to access this file system.
chmod 777 /tmp/ntfsfs-mnt

Then you can try to create long files outside of Wine:

# 257 UTF-8 bytes, 129 characters
echo foo >
/tmp/ntfsfs-mnt/ääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääa
# 325 UTF-8 bytes, 109 characters
echo foo >
/tmp/ntfsfs-mnt/亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜a

And inside Wine:

wine cmd

# 257 UTF-8 bytes, 129 characters
echo foo >
/tmp/ntfsfs-mnt/ääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääääb
# 325 UTF-8 bytes, 109 characters
echo foo >
/tmp/ntfsfs-mnt/亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜b

Remember to have UTF-8 support enabled in your system.

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

--- Comment #1 from Dmitry Timoshkov  2011-04-22 23:45:35 CDT ---
Wine version? Do you have an application that is affected by this or this is
a pure speculation?

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

Jerome Leclanche  changed:

What    |Removed                     |Added
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                 CC|                            |[e-mail]

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

--- Comment #2 from Jussi Judin  2011-04-23 04:25:49 CDT ---
(In reply to comment #1)
> Wine version? Do you have an application that is affected by this or this is
> a pure speculation?

This affects any application that tries to create files which is why I used cmd
here as an example. You can try this by using any of those file names I have
given here as an example that they indeed can be created in Windows and in bash
or by using touch (on a NTFS file system) but inside Wine this is not possible.
I have explicitly verified this in Windows 2008 Server R2 with Notepad++ and
trying the same with Wine 1.3.18.

This problem can happen in cases where you have existing files with longish
names (they are not that long when you use characters that take 2 or 3 bytes
per character, especially with some East Asian based languages, like Japanese)
and you can't explicitly choose a file name that the program tries to save with
(like with many programs that are used to share files). Also when program
appends some string besides the original file name to create a temporary file
(like Firefox with its downloads and originalname.part file names) it can
result in overly long file names.

If you are using these files on any Linux file systems, you are out of luck but
if you know about the problem, you should be able to create a NTFS file system
to go around this. Or HFS+ on Mac.

And I wouldn't have reported this bug if I hadn't encountered this bug myself
and it hadn't forced me to painfully use Windows to go around this problem =)

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

Dmitry Timoshkov  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unspecified                 |1.3.18
           Severity|normal                      |minor

--- Comment #3 from Dmitry Timoshkov  2011-04-23 06:33:37 CDT ---
Neither Wine nor NTFS internally store file names in multibyte encodings,
so you probably got misguided somewhere.

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

--- Comment #4 from Jussi Judin  2011-04-23 09:01:28 CDT ---
(In reply to comment #3)
> Neither Wine nor NTFS internally store file names in multibyte encodings,
> so you probably got misguided somewhere.

Wine doesn't clearly take multibyte characters into account but imposes a limit
that clearly comes from the file name length in bytes, not in something that is
imposed by file system. But claiming that NTFS doesn't take multibyte encodings
into account is completely wrong as Wikipedia
(https://secure.wikimedia.org/wikipedia/en/wiki/NTFS) states that NTFS limits
its file length to 255 UTF-16 code units, 1 code unit is 2 bytes => 510 bytes
(some of the 1 code unit characters can result in 3 byte strings with UTF-8
encoding). This usually results 255 character limit but if you use characters
that don't fit into basic multilingual plane, like

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

--- Comment #5 from Jussi Judin  2011-04-23 09:03:23 CDT ---
Let's try this without that one character that breaks bugzilla:

(In reply to comment #3)
> Neither Wine nor NTFS internally store file names in multibyte encodings,
> so you probably got misguided somewhere.

Wine doesn't clearly take multibyte characters into account but imposes a limit
that clearly comes from the file name length in bytes, not in something that is
imposed by file system. But claiming that NTFS doesn't take multibyte encodings
into account is completely wrong as Wikipedia
(https://secure.wikimedia.org/wikipedia/en/wiki/NTFS) states that NTFS limits
its file length to 255 UTF-16 code units, 1 code unit is 2 bytes => 510 bytes
(some of the 1 code unit characters can result in 3 byte strings with UTF-8
encoding). This usually results 255 character limit but if you use characters
that don't fit into basic multilingual plane, like \U103A0, then you are
limited to less characters as now one character takes 2 UTF-16 code units to
encode.

You can test everything I have said to confirm yourself if you are doubtful
with the commands I have given to create a NTFS files system, mount it with
NTFS-3G and to create files from your favorite shell that will result in file
names that are over 255 bytes when they are UTF-8 encoded but they still hold
under 255 characters and therefore work. You can also run these commands inside
Windows cmd (these characters will look like question marks but you can use
explorer to confirm that the correct file has been created), any unix shell or
inside Wine cmd and see that if executed on NTFS file system, Wine cmd will
fail and other shells will succeed. Or use any other program that can create
files and be run through Wine (like Notepad++).

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

--- Comment #6 from Dmitry Timoshkov  2011-04-23 10:22:23 CDT ---
This all sounds very like a pure speculation and misunderstanding. Testing
with cmd.exe doesn't count as a test case. Write it programmatically in win32,
using appropriate file name prefixes.

What did you make to file this as a bug in the first place?

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

--- Comment #7 from Alexandre Julliard  2011-04-23 10:54:57 CDT ---
Dmitry, please stop, this is clearly a legitimate bug.

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

Ken Sharp  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |download, source
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1

--- Comment #8 from Ken Sharp  2011-04-25 19:37:41 CDT ---
Confirming.

Unhandled exception: page fault on execute access to 0x00740078 in 32-bit code
(0x00740078).

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

--- Comment #9 from Jussi Judin  2011-05-01 13:55:58 CDT ---
Created an attachment (id=34419)
 --> (http://bugs.winehq.org/attachment.cgi?id=34419)
Program to create chosen length file names with single 3-byte UTF-8 character

Here's a small program to test creation of file names with multibyte characters
in them. File names that have UTF-8 length over 255 won't work in Wine on NTFS
file system even though they will work in Windows (tested in Windows 2000), as
long as UTF-16 length is less than 256. File names that have their length in
shorter than 256 UTF-8 bytes will be created successfully.

Here's the program output on Windows 2000:

C:>unicode-file-create 255
UTF-8 length: 765
UTF-16 length: 255
Great success
Closed: 1

C:>unicode-file-create 256
UTF-8 length: 768
UTF-16 length: 256
Error: 123

C:>unicode-file-create 257
UTF-8 length: 771
UTF-16 length: 257
Error: 3

And with Wine 1.3.18:

jussi@jussiblet:/tmp/ntfsfs-mnt$ wine unicode-file-create.exe 85
UTF-8 length: 255
UTF-16 length: 85
Great success
Closed: 1

jussi@jussiblet:/tmp/ntfsfs-mnt$ wine unicode-file-create.exe 86
UTF-8 length: 258
UTF-16 length: 86
Error: 2

jussi@jussiblet:/tmp/ntfsfs-mnt$ wine unicode-file-create.exe 87
UTF-8 length: 261
UTF-16 length: 87
Error: 2

And I did encounter this problem in real-world application usage that led me to
investigate that what did that file creation failure message in logs with error
code 2 meant. So this didn't come up just in some theoretical Wine's file
creation limit testing.

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

--- Comment #10 from [e-mail] 2013-11-24 12:15:02 CST ---
This ticket has not been updated for over 900 days. Development recommends
to check the status on your bug every release or two and let to be known if the
bug is still present. If not, mark it fixed. If you are no longer able to put
effort to this ticket, you can abandon it.

Is this still an issue with 1.7.7 or higher ?

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

Simon  changed:

What    |Removed                     |Added
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                 CC|                            |[e-mail]

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

Dr 4asm  changed:

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--- Comment #11 from Dr 4asm  ---
Still an issue in 1.7.15.
I've compiled and ran the program.
On Windows XP, it works as OP described: works up to and including 255, fails
after.

No matter how many characters filename has, 1, 85, 255, etc., on wine, it
always fails with error 2, the ERROR_FILE_NOT_FOUND. The wine prefix is on the
standard Mac OS X filesystem, Mac OS Extended (Journaled).
I'm pretty sure, that it is not an issue with my filesystem, since creating
file with many characters from the terminal works fine, and according to
wikipedia, Mac OS Extended can have maximum filename of "255 characters (255
UTF-16 encoding units, normalized to Apple-modified variant of Unicode
Normalization Format D)".

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

Ken Sharp  changed:

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  Attachment #34419|application/octet-stream    |text/plain
          mime type|                            |

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

Ken Sharp  changed:

What    |Removed                     |Added
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           Keywords|                            |testcase
                URL|                            |http://notepad-plus-plus.or
                   |                            |g/download/

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

http://bugs.winehq.org/show_bug.cgi?id=26888

Brandon Corujo  changed:

What    |Removed                     |Added
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[Bug 26888] Wine limits file names to 255 bytes even on NTFS

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=26888

--- Comment #12 from Janne  ---
Created attachment 77356
  --> https://bugs.winehq.org/attachment.cgi?id=77356
file creation testlog

Hello,

I tested this with Wine 9.00.

I created 4 files with lengths of: 50,75,255 and 257.
Program shows that everything is OK and files are being created. 
After creations there are 3 files with lengths: 50,75 and 85.
File with name length 85 is from last creation.

I tested also with Windows 10.
In Windows 10, maximum filename length is 240. Longer than that there will be
error 3.

Folder where above tests were done is Windows NTFS drive that was mounted to
linux.

See attached log.

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=26888

--- Comment #13 from Janne  ---
Created attachment 77360
  --> https://bugs.winehq.org/attachment.cgi?id=77360
linux_file_creation_test

I tested to create files with long names with touch command.
Seems that maximum filename length is 255 bytes.
Used system Ubuntu: 24.04

Could it be that in this case this is not problem in wine?

See attached log for details.

[Bug 26888] Wine limits file names to 255 bytes even on NTFS

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=26888

Janne  changed:

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--- Comment #14 from Janne  ---
My previous comment can be ignored.
Test was not done NTFS drive.