blob: 10afd4162c157271ca9d08de73795a1155a27775
1 | /* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_extension.c,v 1.7 2010-03-10 18:56:48 bfriesen 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 | |
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 *link = tif->tif_clientinfo; |
70 | |
71 | while( link != NULL && strcmp(link->name,name) != 0 ) |
72 | link = link->next; |
73 | |
74 | if( link != NULL ) |
75 | return link->data; |
76 | else |
77 | return NULL; |
78 | } |
79 | |
80 | void TIFFSetClientInfo( TIFF *tif, void *data, const char *name ) |
81 | |
82 | { |
83 | TIFFClientInfoLink *link = tif->tif_clientinfo; |
84 | |
85 | /* |
86 | ** Do we have an existing link with this name? If so, just |
87 | ** set it. |
88 | */ |
89 | while( link != NULL && strcmp(link->name,name) != 0 ) |
90 | link = link->next; |
91 | |
92 | if( link != NULL ) |
93 | { |
94 | link->data = data; |
95 | return; |
96 | } |
97 | |
98 | /* |
99 | ** Create a new link. |
100 | */ |
101 | |
102 | link = (TIFFClientInfoLink *) _TIFFmalloc(sizeof(TIFFClientInfoLink)); |
103 | assert (link != NULL); |
104 | link->next = tif->tif_clientinfo; |
105 | link->name = (char *) _TIFFmalloc((tmsize_t)(strlen(name)+1)); |
106 | assert (link->name != NULL); |
107 | strcpy(link->name, name); |
108 | link->data = data; |
109 | |
110 | tif->tif_clientinfo = link; |
111 | } |
112 | /* |
113 | * Local Variables: |
114 | * mode: c |
115 | * c-basic-offset: 8 |
116 | * fill-column: 78 |
117 | * End: |
118 | */ |
119 |