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