1 /* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_extension.c,v 1.8 2015-12-06 11:13:43 erouault Exp $ */
2 
3 /*
4  * Copyright (c) 1988-1997 Sam Leffler
5  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
6  *
7  * Permission to use, copy, modify, distribute, and sell this software and
8  * its documentation for any purpose is hereby granted without fee, provided
9  * that (i) the above copyright notices and this permission notice appear in
10  * all copies of the software and related documentation, and (ii) the names of
11  * Sam Leffler and Silicon Graphics may not be used in any advertising or
12  * publicity relating to the software without the specific, prior written
13  * permission of Sam Leffler and Silicon Graphics.
14  *
15  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
16  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
17  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
18  *
19  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
20  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
21  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
22  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
23  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24  * OF THIS SOFTWARE.
25  */
26 
27 /*
28  * TIFF Library.
29  *
30  * Various routines support external extension of the tag set, and other
31  * application extension capabilities.
32  */
33 
34 #include <precomp.h>
35 
36 int TIFFGetTagListCount( TIFF *tif )
37 
38 {
39     TIFFDirectory* td = &tif->tif_dir;
40 
41     return td->td_customValueCount;
42 }
43 
44 uint32 TIFFGetTagListEntry( TIFF *tif, int tag_index )
45 
46 {
47     TIFFDirectory* td = &tif->tif_dir;
48 
49     if( tag_index < 0 || tag_index >= td->td_customValueCount )
50         return (uint32)(-1);
51     else
52         return td->td_customValues[tag_index].info->field_tag;
53 }
54 
55 /*
56 ** This provides read/write access to the TIFFTagMethods within the TIFF
57 ** structure to application code without giving access to the private
58 ** TIFF structure.
59 */
60 TIFFTagMethods *TIFFAccessTagMethods( TIFF *tif )
61 
62 {
63     return &(tif->tif_tagmethods);
64 }
65 
66 void *TIFFGetClientInfo( TIFF *tif, const char *name )
67 
68 {
69     TIFFClientInfoLink *psLink = tif->tif_clientinfo;
70 
71     while( psLink != NULL && strcmp(psLink->name,name) != 0 )
72         psLink = psLink->next;
73 
74     if( psLink != NULL )
75         return psLink->data;
76     else
77         return NULL;
78 }
79 
80 void TIFFSetClientInfo( TIFF *tif, void *data, const char *name )
81 
82 {
83     TIFFClientInfoLink *psLink = tif->tif_clientinfo;
84 
85     /*
86     ** Do we have an existing link with this name?  If so, just
87     ** set it.
88     */
89     while( psLink != NULL && strcmp(psLink->name,name) != 0 )
90         psLink = psLink->next;
91 
92     if( psLink != NULL )
93     {
94         psLink->data = data;
95         return;
96     }
97 
98     /*
99     ** Create a new link.
100     */
101 
102     psLink = (TIFFClientInfoLink *) _TIFFmalloc(sizeof(TIFFClientInfoLink));
103     assert (psLink != NULL);
104     psLink->next = tif->tif_clientinfo;
105     psLink->name = (char *) _TIFFmalloc((tmsize_t)(strlen(name)+1));
106     assert (psLink->name != NULL);
107     strcpy(psLink->name, name);
108     psLink->data = data;
109 
110     tif->tif_clientinfo = psLink;
111 }
112 /*
113  * Local Variables:
114  * mode: c
115  * c-basic-offset: 8
116  * fill-column: 78
117  * End:
118  */
119