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[wxWidgets.git] / src / tiff / libtiff / tif_flush.c
1
2 /*
3 * Copyright (c) 1988-1997 Sam Leffler
4 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
5 *
6 * Permission to use, copy, modify, distribute, and sell this software and
7 * its documentation for any purpose is hereby granted without fee, provided
8 * that (i) the above copyright notices and this permission notice appear in
9 * all copies of the software and related documentation, and (ii) the names of
10 * Sam Leffler and Silicon Graphics may not be used in any advertising or
11 * publicity relating to the software without the specific, prior written
12 * permission of Sam Leffler and Silicon Graphics.
13 *
14 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
15 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
16 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
17 *
18 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
19 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
20 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
21 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
22 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 * OF THIS SOFTWARE.
24 */
25
26 /*
27 * TIFF Library.
28 */
29 #include "tiffiop.h"
30
31 int
32 TIFFFlush(TIFF* tif)
33 {
34 if( tif->tif_mode == O_RDONLY )
35 return 1;
36
37 if (!TIFFFlushData(tif))
38 return (0);
39
40 /* In update (r+) mode we try to detect the case where
41 only the strip/tile map has been altered, and we try to
42 rewrite only that portion of the directory without
43 making any other changes */
44
45 if( (tif->tif_flags & TIFF_DIRTYSTRIP)
46 && !(tif->tif_flags & TIFF_DIRTYDIRECT)
47 && tif->tif_mode == O_RDWR )
48 {
49 uint64 *offsets=NULL, *sizes=NULL;
50
51 if( TIFFIsTiled(tif) )
52 {
53 if( TIFFGetField( tif, TIFFTAG_TILEOFFSETS, &offsets )
54 && TIFFGetField( tif, TIFFTAG_TILEBYTECOUNTS, &sizes )
55 && _TIFFRewriteField( tif, TIFFTAG_TILEOFFSETS, TIFF_LONG8,
56 tif->tif_dir.td_nstrips, offsets )
57 && _TIFFRewriteField( tif, TIFFTAG_TILEBYTECOUNTS, TIFF_LONG8,
58 tif->tif_dir.td_nstrips, sizes ) )
59 {
60 tif->tif_flags &= ~TIFF_DIRTYSTRIP;
61 tif->tif_flags &= ~TIFF_BEENWRITING;
62 return 1;
63 }
64 }
65 else
66 {
67 if( TIFFGetField( tif, TIFFTAG_STRIPOFFSETS, &offsets )
68 && TIFFGetField( tif, TIFFTAG_STRIPBYTECOUNTS, &sizes )
69 && _TIFFRewriteField( tif, TIFFTAG_STRIPOFFSETS, TIFF_LONG8,
70 tif->tif_dir.td_nstrips, offsets )
71 && _TIFFRewriteField( tif, TIFFTAG_STRIPBYTECOUNTS, TIFF_LONG8,
72 tif->tif_dir.td_nstrips, sizes ) )
73 {
74 tif->tif_flags &= ~TIFF_DIRTYSTRIP;
75 tif->tif_flags &= ~TIFF_BEENWRITING;
76 return 1;
77 }
78 }
79 }
80
81 if ((tif->tif_flags & (TIFF_DIRTYDIRECT|TIFF_DIRTYSTRIP))
82 && !TIFFRewriteDirectory(tif))
83 return (0);
84
85 return (1);
86 }
87
88 /*
89 * Flush buffered data to the file.
90 *
91 * Frank Warmerdam'2000: I modified this to return 1 if TIFF_BEENWRITING
92 * is not set, so that TIFFFlush() will proceed to write out the directory.
93 * The documentation says returning 1 is an error indicator, but not having
94 * been writing isn't exactly a an error. Hopefully this doesn't cause
95 * problems for other people.
96 */
97 int
98 TIFFFlushData(TIFF* tif)
99 {
100 if ((tif->tif_flags & TIFF_BEENWRITING) == 0)
101 return (1);
102 if (tif->tif_flags & TIFF_POSTENCODE) {
103 tif->tif_flags &= ~TIFF_POSTENCODE;
104 if (!(*tif->tif_postencode)(tif))
105 return (0);
106 }
107 return (TIFFFlushData1(tif));
108 }
109
110 /* vim: set ts=8 sts=8 sw=8 noet: */
111 /*
112 * Local Variables:
113 * mode: c
114 * c-basic-offset: 8
115 * fill-column: 78
116 * End:
117 */
wxWidgets (Impactor)