1 /* PDFlib GmbH cvsid:
2 * $Id: tif_extension.c,v 1.5 2005/12/21 11:32:07 rjs Exp $ */
3
4 /*
5 * Copyright (c) 1988-1997 Sam Leffler
6 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
7 *
8 * Permission to use, copy, modify, distribute, and sell this software and
9 * its documentation for any purpose is hereby granted without fee, provided
10 * that (i) the above copyright notices and this permission notice appear in
11 * all copies of the software and related documentation, and (ii) the names of
12 * Sam Leffler and Silicon Graphics may not be used in any advertising or
13 * publicity relating to the software without the specific, prior written
14 * permission of Sam Leffler and Silicon Graphics.
15 *
16 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
18 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
19 *
20 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
21 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
22 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
23 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
24 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
25 * OF THIS SOFTWARE.
26 */
27
28 /*
29 * TIFF Library.
30 *
31 * Various routines support external extension of the tag set, and other
32 * application extension capabilities.
33 */
34
35 #include "tiffiop.h"
36
TIFFGetTagListCount(TIFF * tif)37 int TIFFGetTagListCount( TIFF *tif )
38
39 {
40 TIFFDirectory* td = &tif->tif_dir;
41
42 return td->td_customValueCount;
43 }
44
TIFFGetTagListEntry(TIFF * tif,int tag_index)45 ttag_t TIFFGetTagListEntry( TIFF *tif, int tag_index )
46
47 {
48 TIFFDirectory* td = &tif->tif_dir;
49
50 if( tag_index < 0 || tag_index >= td->td_customValueCount )
51 return (ttag_t) -1;
52 else
53 return td->td_customValues[tag_index].info->field_tag;
54 }
55
56 /*
57 ** This provides read/write access to the TIFFTagMethods within the TIFF
58 ** structure to application code without giving access to the private
59 ** TIFF structure.
60 */
TIFFAccessTagMethods(TIFF * tif)61 TIFFTagMethods *TIFFAccessTagMethods( TIFF *tif )
62
63 {
64 return &(tif->tif_tagmethods);
65 }
66
TIFFGetClientInfo(TIFF * tif,const char * name)67 void *TIFFGetClientInfo( TIFF *tif, const char *name )
68
69 {
70 TIFFClientInfoLink *ilink = tif->tif_clientinfo;
71
72 while(ilink != NULL && strcmp(ilink->name,name) != 0 )
73 ilink = ilink->next;
74
75 if( ilink != NULL )
76 return ilink->data;
77 else
78 return NULL;
79 }
80
TIFFSetClientInfo(TIFF * tif,void * data,const char * name)81 void TIFFSetClientInfo( TIFF *tif, void *data, const char *name )
82
83 {
84 TIFFClientInfoLink *ilink = tif->tif_clientinfo;
85
86 /*
87 ** Do we have an existing link with this name? If so, just
88 ** set it.
89 */
90 while( ilink != NULL && strcmp(ilink->name,name) != 0 )
91 ilink = ilink->next;
92
93 if( ilink != NULL )
94 {
95 ilink->data = data;
96 return;
97 }
98
99 /*
100 ** Create a new link.
101 */
102
103 ilink = (TIFFClientInfoLink *) _TIFFmalloc(sizeof(TIFFClientInfoLink));
104 assert (ilink != NULL);
105 ilink->next = tif->tif_clientinfo;
106 ilink->name = (char *) _TIFFmalloc(strlen(name)+1);
107 assert (ilink->name != NULL);
108 strcpy(ilink->name, name);
109 ilink->data = data;
110
111 tif->tif_clientinfo = ilink;
112 }
113