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7 <title>TIFFWriteDirectory</title>
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10
11 <h1 align=center>TIFFWriteDirectory</h1>
12 <a href="#NAME">NAME</a><br>
13 <a href="#SYNOPSIS">SYNOPSIS</a><br>
14 <a href="#DESCRIPTION">DESCRIPTION</a><br>
15 <a href="#RETURN VALUES">RETURN VALUES</a><br>
16 <a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
17 <a href="#SEE ALSO">SEE ALSO</a><br>
18
19 <hr>
20 <a name="NAME"></a>
21 <h2>NAME</h2>
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27 <td width="91%">
28 <p>TIFFWriteDirectory, TIFFRewriteDirectory,
29 TIFFCheckpointDirectory &minus; write the current directory
30 in an open <small>TIFF</small> file</p>
31 </td>
32 </table>
33 <a name="SYNOPSIS"></a>
34 <h2>SYNOPSIS</h2>
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41 <p><b>#include &lt;tiffio.h&gt;</b></p>
42 <!-- INDENTATION -->
43 <p><b>int TIFFWriteDirectory(TIFF *</b><i>tif</i><b>)<br>
44 int TIFFRewriteDirectory(TIFF *</b><i>tif</i><b>)<br>
45 int TIFFCheckpointDirectory(TIFF *</b><i>tif</i><b>)</b></p>
46 </td>
47 </table>
48 <a name="DESCRIPTION"></a>
49 <h2>DESCRIPTION</h2>
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56 <p><i>TIFFWriteDirectory</i> will write the contents of the
57 current directory to the file and setup to create a new
58 subfile in the same file. Applications only need to call
59 <i>TIFFWriteDirectory</i> when writing multiple subfiles to
60 a single <small>TIFF</small> file. <i>TIFFWriteDirectory</i>
61 is automatically called by <i>TIFFClose</i> and
62 <i>TIFFFlush</i> to write a modified directory if the file
63 is open for writing.</p>
64 <!-- INDENTATION -->
65 <p>The <i>TIFFRewriteDirectory</i> function operates
66 similarly to <i>TIFFWriteDirectory,</i> but can be called
67 with directories previously read or written that already
68 have an established location in the file. It will rewrite
69 the directory, but instead of place it at it&rsquo;s old
70 location (as <i>TIFFWriteDirectory</i> would) it will place
71 them at the end of the file, correcting the pointer from the
72 preceeding directory or file header to point to it&rsquo;s
73 new location. This is particularly important in cases where
74 the size of the directory and pointed to data has grown, so
75 it won&rsquo;t fit in the space available at the old
76 location.</p>
77 <!-- INDENTATION -->
78 <p>The <i>TIFFCheckpointDirectory</i> writes the current
79 state of the tiff directory into the file to make what is
80 currently in the file readable. Unlike
81 <i>TIFFWriteDirectory, TIFFCheckpointDirectory</i> does not
82 free up the directory data structures in memory, so they can
83 be updated (as strips/tiles are written) and written again.
84 Reading such a partial file you will at worst get a tiff
85 read error for the first strip/tile encountered that is
86 incomplete, but you will at least get all the valid data in
87 the file before that. When the file is complete, just use
88 <i>TIFFWriteDirectory</i> as usual to finish it off
89 cleanly.</p>
90 </td>
91 </table>
92 <a name="RETURN VALUES"></a>
93 <h2>RETURN VALUES</h2>
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100 <p>1 is returned when the contents are successfully written
101 to the file. Otherwise, 0 is returned if an error was
102 encountered when writing the directory contents.</p>
103 </td>
104 </table>
105 <a name="DIAGNOSTICS"></a>
106 <h2>DIAGNOSTICS</h2>
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113 <p>All error messages are directed to the
114 <i>TIFFError</i>(3TIFF) routine.</p>
115 <!-- INDENTATION -->
116 <p><b>Error post-encoding before directory write</b>. Before
117 writing the contents of the current directory, any pending
118 data are flushed. This message indicates that an error
119 occurred while doing this.</p>
120 <!-- INDENTATION -->
121 <p><b>Error flushing data before directory write</b>. Before
122 writing the contents of the current directory, any pending
123 data are flushed. This message indicates that an error
124 occurred while doing this.</p>
125 <!-- INDENTATION -->
126 <p><b>Cannot write directory, out of space</b>. There was
127 not enough space to allocate a temporary area for the
128 directory that was to be written.</p>
129 <!-- INDENTATION -->
130 <p><b>Error writing directory count</b>. A write error
131 occurred when writing the count of fields in the
132 directory.</p>
133 <!-- INDENTATION -->
134 <p><b>Error writing directory contents</b>. A write error
135 occurred when writing the directory fields.</p>
136 <!-- INDENTATION -->
137 <p><b>Error writing directory link</b>. A write error
138 occurred when writing the link to the next directory.</p>
139 <!-- INDENTATION -->
140 <p><b>Error writing data for field &quot;%s&quot;</b>. A
141 write error occurred when writing indirect data for the
142 specified field.</p>
143 <!-- INDENTATION -->
144 <p><b>Error writing TIFF header</b>. A write error occurred
145 when re-writing header at the front of the file.</p>
146 <!-- INDENTATION -->
147 <p><b>Error fetching directory count</b>. A read error
148 occurred when fetching the directory count field for a
149 previous directory. This can occur when setting up a link to
150 the directory that is being written.</p>
151 <!-- INDENTATION -->
152 <p><b>Error fetching directory link</b>. A read error
153 occurred when fetching the directory link field for a
154 previous directory. This can occur when setting up a link to
155 the directory that is being written.</p>
156 </td>
157 </table>
158 <a name="SEE ALSO"></a>
159 <h2>SEE ALSO</h2>
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166 <p><b>TIFFOpen</b>(3TIFF), <b>TIFFError</b>(3TIFF),
167 <b>TIFFReadDirectory</b>(3TIFF),
168 <b>TIFFSetDirectory</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
169 <!-- INDENTATION -->
170 <p>Libtiff library home page:
171 <b>http://www.remotesensing.org/libtiff/</b></p>
172 </td>
173 </table>
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