1
.\" $Id: TIFFReadDirectory.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $
3
.\" Copyright (c) 1988-1997 Sam Leffler
4
.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
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.
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.
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
26
.TH TIFFReadDirectory 3TIFF "October 15, 1995" "libtiff"
28
TIFFReadDirectory \- get the contents of the next directory in an open
32
.B "#include <tiffio.h>"
34
.BI "int TIFFReadDirectory(TIFF *" tif ")"
36
Read the next directory in the specified file and make it the current
37
directory. Applications only need to call
39
to read multiple subfiles in a single
42
the first directory in a file is automatically read when
46
If the library is compiled with
48
enabled, then images that have a single uncompressed strip or tile of data are
49
automatically treated as if they were made up of multiple strips or tiles of
50
approximately 8 kilobytes each. This operation is done only in-memory; it does
51
not alter the contents of the file. However, the construction of the ``chopped
52
strips'' is visible to the application through the number of strips [tiles]
56
.IR TIFFNumberOfTiles ].
58
If the next directory was successfully read, 1 is returned. Otherwise, 0 is
59
returned if an error was encountered, or if there are no more directories to
62
All error messages are directed to the
65
All warning messages are directed to the
66
.IR TIFFWarning (3TIFF)
69
\fBSeek error accessing TIFF directory\fP.
70
An error occurred while positioning to the location of the
73
\fBWrong data type %d for field "%s"\fP.
74
The tag entry in the directory had an incorrect data type.
81
\fBTIFF directory is missing required "%s" field\fP.
82
The specified tag is required to be present by the
84
5.0 specification, but is missing.
85
The directory is (usually) unusable.
87
\fB%s: Rational with zero denominator\fP.
90
value whose denominator is zero.
92
\fBIncorrect count %d for field "%s" (%lu, expecting %lu); tag ignored\fP.
93
The specified tag's count field is bad.
94
For example, a count other than 1 for a
98
\fBCannot handle different per-sample values for field "%s"\fP.
101
values and they are not all the same; e.g.
103
The library is unable to handle images of this sort.
105
\fBCount mismatch for field "%s"; expecting %d, got %d\fP.
107
tag does not agree with the number expected by the library.
108
This should never happen, so if it does, the library refuses to
111
\fBInvalid TIFF directory; tags are not sorted in ascending order\fP.
112
The directory tags are not properly sorted as specified
116
This error is not fatal.
118
\fBIgnoring unknown field with tag %d (0x%x)\fP.
119
An unknown tag was encountered in the directory;
120
the library ignores all such tags.
122
\fBTIFF directory is missing requred "ImageLength" field\fP.
123
The image violates the specification by not having a necessary field.
124
There is no way for the library to recover from this error.
126
\fBTIFF directory is missing requred "PlanarConfig" field\fP.
127
The image violates the specification by not having a necessary field.
128
There is no way for the library to recover from this error.
130
\fBTIFF directory is missing requred "StripOffsets" field\fP.
131
The image has multiple strips, but is missing the tag that
132
specifies the file offset to each strip of data.
133
There is no way for the library to recover from this error.
135
\fBTIFF directory is missing requred "TileOffsets" field\fP.
136
The image has multiple tiles, but is missing the tag that
137
specifies the file offset to each tile of data.
138
There is no way for the library to recover from this error.
140
\fBTIFF directory is missing required "StripByteCounts" field\fP.
141
The image has multiple strips, but is missing the tag that
142
specifies the size of each strip of data.
143
There is no way for the library to recover from this error.
145
\fBTIFF directory is missing required "StripByteCounts" field, calculating from imagelength\fP.
146
The image violates the specification by not having a necessary field.
147
However, when the image is comprised of only one strip or tile, the
148
library will estimate the missing value based on the file size.
150
\fBBogus "StripByteCounts" field, ignoring and calculating from imagelength\fP.
151
Certain vendors violate the specification by writing zero for
152
the StripByteCounts tag when they want to leave the value
154
If the image has a single strip, the library will estimate
155
the missing value based on the file size.
157
.BR TIFFOpen (3TIFF),
158
.BR TIFFWriteDirectory (3TIFF),
159
.BR TIFFSetDirectory (3TIFF),
160
.BR TIFFSetSubDirectory (3TIFF),
163
Libtiff library home page:
164
.BR http://www.remotesensing.org/libtiff/