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80ed523f | 1 | /* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_extension.c,v 1.7 2010-03-10 18:56:48 bfriesen Exp $ */ |
8414a40c VZ |
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 | ||
80ed523f | 44 | uint32 TIFFGetTagListEntry( TIFF *tif, int tag_index ) |
8414a40c VZ |
45 | |
46 | { | |
47 | TIFFDirectory* td = &tif->tif_dir; | |
48 | ||
49 | if( tag_index < 0 || tag_index >= td->td_customValueCount ) | |
80ed523f | 50 | return (uint32)(-1); |
8414a40c VZ |
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; | |
80ed523f | 105 | link->name = (char *) _TIFFmalloc((tmsize_t)(strlen(name)+1)); |
8414a40c VZ |
106 | assert (link->name != NULL); |
107 | strcpy(link->name, name); | |
108 | link->data = data; | |
109 | ||
110 | tif->tif_clientinfo = link; | |
111 | } | |
80ed523f VZ |
112 | /* |
113 | * Local Variables: | |
114 | * mode: c | |
115 | * c-basic-offset: 8 | |
116 | * fill-column: 78 | |
117 | * End: | |
118 | */ |