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XCF format specification

This discussion is connected to the gimp-developer-list.gnome.org mailing list which is provided by the GIMP developers and not related to gimpusers.com.

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XCF format specification Henning Makholm 05 Jul 20:44
  XCF format specification Sven Neumann 05 Jul 21:54
   XCF format specification Henning Makholm 06 Jul 12:49
XCF format specification Dave Neary 06 Jul 11:47
  XCF format specification Henning Makholm 06 Jul 13:16
  XCF format specification Sven Neumann 06 Jul 21:44
  XCF format specification Henning Makholm 09 Jul 22:12
Henning Makholm
2006-07-05 20:44:18 UTC (over 18 years ago)

XCF format specification

The XCF file format is currently documented primarily by the Gimp source, and by the very old and sketchy devel-docs/xcf.txt in the source tree.

I have attempted to write a better specification, encouraged by Dave Neary and partly based on my experiences writing a third-party XCF reader (xcftools, at ). It is at

http://henning.makholm.net/xcftools/xcfspec.txt

I would like to contribute it as a replacement for xcf.txt, but I would like it to be correct first. I would appreciate it if somebody who are familiar with the format could look over my text and check it for obvious mistakes.

Related to this: While researching the format I discovered a buffer overrun somewhere in the XCF parsing code. Is there a recommended way to report security bugs confidentially? (I asked on IRC and was encouraged to just use the public bugzilla, but I'm uncomfortable by following such advice gathered on a lazy IRC channel).

Sven Neumann
2006-07-05 21:54:20 UTC (over 18 years ago)

XCF format specification

Hi,

On Wed, 2006-07-05 at 20:44 +0200, Henning Makholm wrote:

Related to this: While researching the format I discovered a buffer overrun somewhere in the XCF parsing code. Is there a recommended way to report security bugs confidentially? (I asked on IRC and was encouraged to just use the public bugzilla, but I'm uncomfortable by following such advice gathered on a lazy IRC channel).

Please use Bugzilla as you have been told on #gimp.

Sven

Dave Neary
2006-07-06 11:47:45 UTC (over 18 years ago)

XCF format specification

Hi,

http://henning.makholm.net/xcftools/xcfspec.txt

Wow! When you said you were putting it on your TODO list, I wasn't expecting it this quick, or this complete. This is amazing work.

The only think that I can see which is obviously missing is a definition of the effect of layer modes and masks on compositing.

I would like to contribute it as a replacement for xcf.txt, but I would like it to be correct first.

While that's an admirable goal, it's already vastly better than what's there already. So I think the sooner we get this into devel-docs the better.

Cheers, Dave.

Henning Makholm
2006-07-06 12:49:22 UTC (over 18 years ago)

XCF format specification

Scripsit Sven Neumann

On Wed, 2006-07-05 at 20:44 +0200, Henning Makholm wrote:

Related to this: While researching the format I discovered a buffer overrun somewhere in the XCF parsing code. Is there a recommended way to report security bugs confidentially?

Please use Bugzilla as you have been told on #gimp.

Okay. You can't say I didn't try, then. #346742.

Henning Makholm
2006-07-06 13:16:03 UTC (over 18 years ago)

XCF format specification

Scripsit Dave Neary

http://henning.makholm.net/xcftools/xcfspec.txt

This is amazing work.

:-)

The only think that I can see which is obviously missing is a definition of the effect of layer modes and masks on compositing.

Yes. Am working on that.

I would like to contribute it as a replacement for xcf.txt, but I would like it to be correct first.

While that's an admirable goal, it's already vastly better than what's there already. So I think the sooner we get this into devel-docs the better.

Well, OK. It is hereby GPL2+ licenced, so feel free. Be sure to change the "status of this document" section appropriately before committing.

Sven Neumann
2006-07-06 21:44:14 UTC (over 18 years ago)

XCF format specification

Hi,

On Thu, 2006-07-06 at 11:47 +0200, Dave Neary wrote:

I would like to contribute it as a replacement for xcf.txt, but I would like it to be correct first.

While that's an admirable goal, it's already vastly better than what's there already. So I think the sooner we get this into devel-docs the better.

Henning seems to be interested in improving the text so we should take this opportunity and review it before it is added to the source tree and forgotten there. I started to read the document last night but I haven't finished it yet. If someone else also wants to review it, please do so.

Sven

Henning Makholm
2006-07-09 22:12:30 UTC (over 18 years ago)

XCF format specification

Scripsit Dave Neary

http://henning.makholm.net/xcftools/xcfspec.txt

The only think that I can see which is obviously missing is a definition of the effect of layer modes and masks on compositing.

The text now includes a description of these. I am not completely happy with it (it feels rather disorganized), but it should be better than nothing.