1TIFFWriteDirectory(3TIFF) TIFFWriteDirectory(3TIFF)
2
6 TIFFWriteDirectory, TIFFRewriteDirectory, TIFFCheckpointDirectory -
7 write the current directory in an open TIFF file
8
10 #include <tiffio.h>
11 int TIFFWriteDirectory(TIFF *tif)
13 int TIFFRewriteDirectory(TIFF *tif)
14 int TIFFCheckpointDirectory(TIFF *tif)
15
17 TIFFWriteDirectory will write the contents of the current directory to
18 the file and setup to create a new subfile in the same file. Applica‐
19 tions only need to call TIFFWriteDirectory when writing multiple sub‐
20 files to a single TIFF file. TIFFWriteDirectory is automatically
21 called by TIFFClose and TIFFFlush to write a modified directory if the
22 file is open for writing.
23 The TIFFRewriteDirectory function operates similarly to TIFFWriteDirec‐
25 tory, but can be called with directories previously read or written
26 that already have an established location in the file. It will rewrite
27 the directory, but instead of place it at it's old location (as
28 TIFFWriteDirectory would) it will place them at the end of the file,
29 correcting the pointer from the preceeding directory or file header to
30 point to it's new location. This is particularly important in cases
31 where the size of the directory and pointed to data has grown, so it
32 won't fit in the space available at the old location.
33 The TIFFCheckpointDirectory writes the current state of the tiff direc‐
35 tory into the file to make what is currently in the file readable.
36 Unlike TIFFWriteDirectory, TIFFCheckpointDirectory does not free up the
37 directory data structures in memory, so they can be updated (as
38 strips/tiles are written) and written again. Reading such a partial
39 file you will at worst get a tiff read error for the first strip/tile
40 encountered that is incomplete, but you will at least get all the valid
41 data in the file before that. When the file is complete, just use
42 TIFFWriteDirectory as usual to finish it off cleanly.
43
45 1 is returned when the contents are successfully written to the file.
46 Otherwise, 0 is returned if an error was encountered when writing the
47 directory contents.
48
50 All error messages are directed to the TIFFError(3TIFF) routine.
51 Error post-encoding before directory write. Before writing the con‐
53 tents of the current directory, any pending data are flushed. This mes‐
54 sage indicates that an error occurred while doing this.
55 Error flushing data before directory write. Before writing the con‐
57 tents of the current directory, any pending data are flushed. This mes‐
58 sage indicates that an error occurred while doing this.
59 Cannot write directory, out of space. There was not enough space to
61 allocate a temporary area for the directory that was to be written.
62 Error writing directory count. A write error occurred when writing the
64 count of fields in the directory.
65 Error writing directory contents. A write error occurred when writing
67 the directory fields.
68 Error writing directory link. A write error occurred when writing the
70 link to the next directory.
71 Error writing data for field "%s". A write error occurred when writing
73 indirect data for the specified field.
74 Error writing TIFF header. A write error occurred when re-writing
76 header at the front of the file.
77 Error fetching directory count. A read error occurred when fetching
79 the directory count field for a previous directory. This can occur
80 when setting up a link to the directory that is being written.
81 Error fetching directory link. A read error occurred when fetching the
83 directory link field for a previous directory. This can occur when
84 setting up a link to the directory that is being written.
85
87 TIFFOpen(3TIFF), TIFFError(3TIFF), TIFFReadDirectory(3TIFF), TIFFSetDi‐
88 rectory(3TIFF), libtiff(3TIFF)
89 Libtiff library home page: http://www.remotesensing.org/libtiff/
91libtiff September 26, 2001 TIFFWriteDirectory(3TIFF)