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 "tiffiop.h"
35
TIFFGetTagListCount(TIFF * tif)36 int TIFFGetTagListCount( TIFF *tif )
37
38 {
39 TIFFDirectory* td = &tif->tif_dir;
40
41 return td->td_customValueCount;
42 }
43
TIFFGetTagListEntry(TIFF * tif,int tag_index)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 */
TIFFAccessTagMethods(TIFF * tif)60 TIFFTagMethods *TIFFAccessTagMethods( TIFF *tif )
61
62 {
63 return &(tif->tif_tagmethods);
64 }
65
TIFFGetClientInfo(TIFF * tif,const char * name)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
TIFFSetClientInfo(TIFF * tif,void * data,const char * name)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