[Mono-list] corrupted tiff file on ppc

[Sebastien Pouliot]

On Fri, 2008-11-14 at 16:30 -0800, Dan Shryock wrote:
> Does anybody have any ideas why a simple jpg to tiff conversion leads
> to a corrupted tiff file on OSX 10.4 PPC?

Looks like an endianess bug, probably inside libgdiplus. Please fill a
report on bugzilla.novell.com

Thanks
Sebastien

> 
> I'm using the following code:
> 
> using System;
> using System.Drawing;
> using System.Drawing.Imaging;
> public class Test{
> 	public static void Main(string[] args){
> 		using(var photo = new Bitmap(args[0])){
> 			using(var output = new FileStream(args[0]+".tiff", FileMode.Create)){
> 				output.SetLength(0);
> 				photo.Save(output,ImageFormat.Tiff);
> 			}
> 		}
> 	}
> }
> 
> The resulting tiff file is unreadable when produced by mono 2.0.1 on
> osx, and works just fine using mono 1.9.1 on linux.
> 
> When I compare the two files using "cmp -l good.tiff bad.tiff" the
> output I receive is:
>       1 111 115
>       2 111 115
>       3  52   0
>       4   0  52
>       5  10   0
>       6 300   0
>       7  22   0
>      19  20 377
>    2579  30 377
>    5139  43 377
>    7699  51 377
>   10259  47 377
>   12819  43 377
>   15379  43 377
>   17939  46 377
>   20499   0 377
>   23059 120 377
>   25619 117 377
>   28179  50 377
>   30739  63 377
>   33299  37 377
>   35859   3 377
>   38419  44 377
> <<snip>>
> 
> 
> The interesting thing is that after the first 7 bytes, the bad value
> is always listed as 377, and the offset between bad bytes is 2560.
> 
> So this seems like a bug in mono, but I wanted to ask just to make
> sure that I'm not doing anything stupid.  Thanks!
> 
> Dan
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