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2005.06.23 14:38 "Re: Fix for corrupted multipage TIFF", by Steve Roy
On 20-Jun-05, at 11:01 AM, Frank Warmerdam wrote:
>
> If we were to incorporate such handling, I think it might be best to
> control whether it is used based on an extra open flag indicating
> that an error should not cause complete failure.
I was not familiar with the LibTiff code so I didn't think of that
but it sounds like the right way to go so I attempted to implement
it. Here are my changes. I don't know if they are all correct, and
I'm not sure how to "officially" submit code changes, so feel free to
let me know.
I thought it would be good to add an h flag corresponding to
TIFF_HEADERONLY.
In tiffiop.h
Added:
#define TIFF_HEADERONLY 0x10000 /* read header only */
In tif_open.c, in TIFFClientOpen()
In the mode switch, I added a case for 'h':
case 'h':
tif->tif_flags |= TIFF_HEADERONLY;
break;
Before the block that sets up the initial directory, I added:
if (tif->tif_flags & TIFF_HEADERONLY)
return (tif);
What do you think?
Steve
--
Steve Roy <sroy@mac.com>
Personal homepage: <http://homepage.mac.com/sroy>
Projects homepage: <http://www.roydesign.net>