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Dont allow writing image data to preexisting compressed TIFF images

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This commit is contained in:
Frank Warmerdam 2003-01-31 16:43:18 +00:00
parent 42862eeefd
commit f6b073be96
1 changed files with 19 additions and 1 deletions
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20
libtiff/tif_write.c
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@ -1,4 +1,4 @@
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_write.c,v 1.7 2002-07-31 20:53:15 warmerda Exp $ */
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_write.c,v 1.8 2003-01-31 16:43:18 warmerda Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@ -484,6 +484,24 @@ TIFFWriteCheck(TIFF* tif, int tiles, const char* module)
"Can not write scanlines to a tiled image");
return (0);
}
/*
* While we allow compressed TIFF files to be opened in update mode,
* we don't allow writing any image blocks in an existing compressed
* image. Eventually we could do so, by moving blocks that grow
* to the end of the file, but we don't for now.
*/
if (tif->tif_dir.td_stripoffset != NULL
&& tif->tif_dir.td_compression != COMPRESSION_NONE )
{
TIFFError( module,
"%s:\n"
"In place update to compressed TIFF images not "
"supported.",
tif->tif_name );
return (0);
}
/*
* On the first write verify all the required information
* has been setup and initialize any data structures that