tif_extension.c
上传用户:looem2003
上传日期:2014-07-20
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文件大小:3k
- /* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_extension.c,v 1.4 2004/10/02 13:29:41 dron 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;
- }