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1 .\" $Id: TIFFWriteDirectory.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $
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25 .if n .po 0
26 .TH TIFFWriteDirectory 3TIFF "September 26, 2001" "libtiff"
27 .SH NAME
28 TIFFWriteDirectory, TIFFRewriteDirectory, TIFFCheckpointDirectory \- write the
29 current directory in an open
30 .SM TIFF
31 file
32 .SH SYNOPSIS
33 .B "#include <tiffio.h>"
34 .sp
35 .BI "int TIFFWriteDirectory(TIFF *" tif ")"
36 .br
37 .BI "int TIFFRewriteDirectory(TIFF *" tif ")"
38 .br
39 .BI "int TIFFCheckpointDirectory(TIFF *" tif ")"
40 .SH DESCRIPTION
41 .IR TIFFWriteDirectory
42 will write the contents of the current directory to the file and setup to
43 create a new subfile in the same file. Applications only need to call
44 .IR TIFFWriteDirectory
45 when writing multiple subfiles to a single
46 .SM TIFF
47 file.
48 .IR TIFFWriteDirectory
49 is automatically called by
50 .IR TIFFClose
51 and
52 .IR TIFFFlush
53 to write a modified directory if the file is open for writing.
54 .PP
55 The
56 .IR TIFFRewriteDirectory
57 function operates similarly to
58 .IR TIFFWriteDirectory,
59 but can be called with directories previously read or written that already
60 have an established location in the file. It will rewrite the directory,
61 but instead of place it at it's old location (as
62 .IR TIFFWriteDirectory
63 would) it will place them at the end of the file, correcting the pointer from
64 the preceeding directory or file header to point to it's new location. This
65 is particularly important in cases where the size of the directory and
66 pointed to data has grown, so it won't fit in the space available at the
67 old location.
68 .PP
69 The
70 .IR TIFFCheckpointDirectory
71 writes the current state of the tiff directory into the file to make what
72 is currently in the file readable. Unlike
73 .IR TIFFWriteDirectory,
74 .IR TIFFCheckpointDirectory
75 does not free up the directory data structures in memory, so they can be
76 updated (as strips/tiles are written) and written again. Reading such
77 a partial file you will at worst get a tiff read error for the first
78 strip/tile encountered that is incomplete, but you will at least get
79 all the valid data in the file before that. When the file is complete,
80 just use
81 .IR TIFFWriteDirectory
82 as usual to finish it off cleanly.
83 .SH "RETURN VALUES"
84 1 is returned when the contents are successfully written to the file.
85 Otherwise, 0 is returned if an error was encountered when writing
86 the directory contents.
87 .SH DIAGNOSTICS
88 All error messages are directed to the
89 .IR TIFFError (3TIFF)
90 routine.
91 .PP
92 .BR "Error post-encoding before directory write" .
93 Before writing the contents of the current directory, any pending data are
94 flushed. This message indicates that an error occurred while doing this.
95 .PP
96 .BR "Error flushing data before directory write" .
97 Before writing the contents of the current directory, any pending data are
98 flushed. This message indicates that an error occurred while doing this.
99 .PP
100 .BR "Cannot write directory, out of space" .
101 There was not enough space to allocate a temporary area for the directory that
102 was to be written.
103 .PP
104 .BR "Error writing directory count" .
105 A write error occurred when writing the count of fields in the directory.
106 .PP
107 .BR "Error writing directory contents" .
108 A write error occurred when writing the directory fields.
109 .PP
110 .BR "Error writing directory link" .
111 A write error occurred when writing the link to the next directory.
112 .PP
113 \fBError writing data for field "%s"\fP.
114 A write error occurred when writing indirect data for the specified field.
115 .PP
116 .BR "Error writing TIFF header" .
117 A write error occurred when re-writing header at the front of the file.
118 .PP
119 .BR "Error fetching directory count" .
120 A read error occurred when fetching the directory count field for
121 a previous directory.
122 This can occur when setting up a link to the directory that is being
123 written.
124 .PP
125 .BR "Error fetching directory link" .
126 A read error occurred when fetching the directory link field for
127 a previous directory.
128 This can occur when setting up a link to the directory that is being
129 written.
130 .SH "SEE ALSO"
131 .BR TIFFOpen (3TIFF),
132 .BR TIFFError (3TIFF),
133 .BR TIFFReadDirectory (3TIFF),
134 .BR TIFFSetDirectory (3TIFF),
135 .BR libtiff (3TIFF)
136 .PP
137 Libtiff library home page:
138 .BR http://www.remotesensing.org/libtiff/