/* $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; | |
} |