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December 2005
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2005.12.13 21:55 "Re: read and write image with same TIFF handle", by Frank Warmerdam
On 12/13/05, ϋΕΒΕΛΟ εΧΗΕΞΙΚ wrote: > > As I see, I cann't to read and write image data in one session, i.e. > using one TIFF handle. > The problem in codec's setup. There are only one flags in libtiff > TIFF_CODERSETUP that indicate that codec inited for decode, or code process > (tif->tif_setupdecode,tif->tif_setupencode) > > First call TIFFReadTile() for example codec setup for decode. > Then later TIFFWriteTile() but TIFF_CODERSETUP still set and > tif->tif_setupencode never called. > As a result libtiff crash in codec. > > Is it known problem? ϋΕΒΕΛΟ, I have experienced similar issues. > Is in plans to fix it? > Is problem with codec is only one problem to read and write image > with same TIFF handle? Reading and writing an image with the same handle opened in update mode is supported fine for uncompressed images, so I believe the problem is only related to the compression codecs. > Actually I can to fix it itself. > It is not dificult replace TIFF_CODERSETUP with 2 flags > TIFF_CODERSETUP, TIFF_DECODERSETUP and to control in initialization > code that only one flag could be set. > > 2. question > When next version of libtiff are expected? > If I make some useful changes in libtiff may I expect that this > changes will be included in libtiff? And how can I do it? This is a very fragile aspect of the code. While we would appreciate a carefully constructed patch, I am personally very concerned about unintended consequences and if we can't make ourselves comfortable with the patch, it won't be applied to the core library. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent