2005.10.26 16:34 "[Tiff] Fixed TIFFUnlinkDirectory()", by
Шебеко Евгений
Thread
2005.10.26 16:34 "[Tiff] Fixed TIFFUnlinkDirectory()", by Шебеко Евгений
int TIFFUnlinkDirectory1(TIFF* tif, tdir_t dirn)
{
static const char module[] = "TIFFUnlinkDirectory1";
toff_t nextdir;
toff_t off;
tdir_t n;
if (tif->tif_mode == O_RDONLY) {
TIFFError(module, "Can not unlink directory in read-only file");
return (0);
}
/*
* Go to the directory before the one we want
* to unlink and nab the offset of the link
* field we'll need to patch.
*/
nextdir = tif->tif_header.tiff_diroff;
off = sizeof (uint16) + sizeof (uint16);
for(n=0;n<dirn;n++)
{
if (nextdir == 0)
{
TIFFError(module, "Directory %d does not exist", dirn);
return (0);
}
if (!TIFFAdvanceDirectory(tif, &nextdir, &off))
return (0);
}
/*
* Advance to the directory to be unlinked and fetch
* the offset of the directory that follows.
*/
if (!TIFFAdvanceDirectory(tif, &nextdir, NULL))
return (0);
/*
* If first directory change directory offset in header
*/
if(dirn==0)tif->tif_header.tiff_diroff=nextdir;
/*
* Go back and patch the link field of the preceding
* directory to point to the offset of the directory
* that follows.
*/
(void) TIFFSeekFile(tif, off, SEEK_SET);
if (tif->tif_flags & TIFF_SWAB)TIFFSwabLong(&nextdir);
if (!WriteOK(tif, &nextdir, sizeof (uint32))) {
TIFFError(module, "Error writing directory link");
return (0);
}
/*
* Leave directory state setup safely. We don't have
* facilities for doing inserting and removing directories,
* so it's safest to just invalidate everything. This
* means that the caller can only append to the directory
* chain.
*/
(*tif->tif_cleanup)(tif);
if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) {
_TIFFfree(tif->tif_rawdata);
tif->tif_rawdata = NULL;
tif->tif_rawcc = 0;
}
tif->tif_flags &= ~(TIFF_BEENWRITING|TIFF_BUFFERSETUP|TIFF_POSTENCODE); TIFFFreeDirectory(tif); TIFFDefaultDirectory(tif);
tif->tif_diroff = 0; /* force link on next write */
tif->tif_nextdiroff = 0; /* next write must be at end */
tif->tif_curoff = 0;
tif->tif_row = (uint32) -1;
tif->tif_curstrip = (tstrip_t) -1;
return (1);
}