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/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_extension.c,v 1.4.2.1 2010-06-08 18:50:42 bfriesen Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
* Copyright (c) 1991-1997 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the names of
* Sam Leffler and Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Sam Leffler and Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
/*
* TIFF Library.
*
* Various routines support external extension of the tag set, and other
* application extension capabilities.
*/
#include "tiffiop.h"
int TIFFGetTagListCount( TIFF *tif )
{
TIFFDirectory* td = &tif->tif_dir;
return td->td_customValueCount;
}
ttag_t TIFFGetTagListEntry( TIFF *tif, int tag_index )
{
TIFFDirectory* td = &tif->tif_dir;
if( tag_index < 0 || tag_index >= td->td_customValueCount )
return (ttag_t) -1;
else
return td->td_customValues[tag_index].info->field_tag;
}
/*
** This provides read/write access to the TIFFTagMethods within the TIFF
** structure to application code without giving access to the private
** TIFF structure.
*/
TIFFTagMethods *TIFFAccessTagMethods( TIFF *tif )
{
return &(tif->tif_tagmethods);
}
void *TIFFGetClientInfo( TIFF *tif, const char *name )
{
TIFFClientInfoLink *link = tif->tif_clientinfo;
while( link != NULL && strcmp(link->name,name) != 0 )
link = link->next;
if( link != NULL )
return link->data;
else
return NULL;
}
void TIFFSetClientInfo( TIFF *tif, void *data, const char *name )
{
TIFFClientInfoLink *link = tif->tif_clientinfo;
/*
** Do we have an existing link with this name? If so, just
** set it.
*/
while( link != NULL && strcmp(link->name,name) != 0 )
link = link->next;
if( link != NULL )
{
link->data = data;
return;
}
/*
** Create a new link.
*/
link = (TIFFClientInfoLink *) _TIFFmalloc(sizeof(TIFFClientInfoLink));
assert (link != NULL);
link->next = tif->tif_clientinfo;
link->name = (char *) _TIFFmalloc(strlen(name)+1);
assert (link->name != NULL);
strcpy(link->name, name);
link->data = data;
tif->tif_clientinfo = link;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 8
* fill-column: 78
* End:
*/
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