110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_extension.c,v 1.2 2003-07-08 16:40:46 warmerda Exp $ */
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/*
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* Copyright (c) 1988-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* TIFF Library.
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*
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* Various routines support external extension of the tag set, and other
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* application extension capabilities.
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*/
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#include "tiffiop.h"
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int TIFFGetTagListCount( TIFF *tif )
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{
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TIFFDirectory* td = &tif->tif_dir;
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return td->td_customValueCount;
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}
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ttag_t TIFFGetTagListEntry( TIFF *tif, int tag_index )
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{
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TIFFDirectory* td = &tif->tif_dir;
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if( tag_index < 0 || tag_index >= td->td_customValueCount )
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return (ttag_t) -1;
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else
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return td->td_customValues[tag_index].info->field_tag;
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}
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/*
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** This provides read/write access to the TIFFTagMethods within the TIFF
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** structure to application code without giving access to the private
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** TIFF structure.
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*/
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TIFFTagMethods *TIFFAccessTagMethods( TIFF *tif )
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{
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return &(tif->tif_tagmethods);
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}
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void *TIFFGetClientInfo( TIFF *tif, const char *name )
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{
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TIFFClientInfoLink *link = tif->tif_clientinfo;
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while( link != NULL && strcmp(link->name,name) != 0 )
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link = link->next;
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if( link != NULL )
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return link->data;
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else
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return NULL;
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}
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void TIFFSetClientInfo( TIFF *tif, void *data, const char *name )
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{
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TIFFClientInfoLink *link = tif->tif_clientinfo;
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/*
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** Do we have an existing link with this name? If so, just
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** set it.
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*/
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while( link != NULL && strcmp(link->name,name) != 0 )
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link = link->next;
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if( link != NULL )
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{
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link->data = data;
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return;
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}
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/*
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** Create a new link.
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*/
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link = _TIFFmalloc(sizeof(TIFFClientInfoLink));
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link->next = tif->tif_clientinfo;
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link->name = _TIFFmalloc(strlen(name)+1);
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strcpy( link->name, name );
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link->data = data;
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tif->tif_clientinfo = link;
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}
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