1TIFFReadDirectory(3TIFF) TIFFReadDirectory(3TIFF)
2
6 TIFFReadDirectory - get the contents of the next directory in an open
7 TIFF file
8
10 #include <tiffio.h>
11 int TIFFReadDirectory(TIFF *tif)
13
15 Read the next directory in the specified file and make it the current
16 directory. Applications only need to call TIFFReadDirectory to read
17 multiple subfiles in a single TIFF file— the first directory in a file
18 is automatically read when TIFFOpen is called.
19
21 If the library is compiled with STRIPCHOP_SUPPORT enabled, then images
22 that have a single uncompressed strip or tile of data are automatically
23 treated as if they were made up of multiple strips or tiles of approxi‐
24 mately 8 kilobytes each. This operation is done only in-memory; it does
25 not alter the contents of the file. However, the construction of the
26 ``chopped strips'' is visible to the application through the number of
27 strips [tiles] returned by TIFFNumberOfStrips [TIFFNumberOfTiles].
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30 If the next directory was successfully read, 1 is returned. Otherwise,
31 0 is returned if an error was encountered, or if there are no more
32 directories to be read.
33
35 All error messages are directed to the TIFFError(3TIFF) routine. All
36 warning messages are directed to the TIFFWarning(3TIFF) routine.
37 Seek error accessing TIFF directory. An error occurred while position‐
39 ing to the location of the directory.
40 Wrong data type %d for field "%s". The tag entry in the directory had
42 an incorrect data type. For example, an ImageDescription tag with a
43 SHORT data type.
44 TIFF directory is missing required "%s" field. The specified tag is
46 required to be present by the TIFF 5.0 specification, but is missing.
47 The directory is (usually) unusable.
48 %s: Rational with zero denominator. A directory tag has a RATIONAL
50 value whose denominator is zero.
51 Incorrect count %d for field "%s" (%lu, expecting %lu); tag ignored.
53 The specified tag's count field is bad. For example, a count other
54 than 1 for a SubFileType tag.
55 Cannot handle different per-sample values for field "%s". The tag has
57 SamplesPerPixel values and they are not all the same; e.g. BitsPerSam‐
58 ple. The library is unable to handle images of this sort.
59 Count mismatch for field "%s"; expecting %d, got %d. The count field
61 in a tag does not agree with the number expected by the library. This
62 should never happen, so if it does, the library refuses to read the
63 directory.
64 Invalid TIFF directory; tags are not sorted in ascending order. The
66 directory tags are not properly sorted as specified in the TIFF 5.0
67 specification. This error is not fatal.
68 Ignoring unknown field with tag %d (0x%x). An unknown tag was encoun‐
70 tered in the directory; the library ignores all such tags.
71 TIFF directory is missing requred "ImageLength" field. The image vio‐
73 lates the specification by not having a necessary field. There is no
74 way for the library to recover from this error.
75 TIFF directory is missing requred "PlanarConfig" field. The image vio‐
77 lates the specification by not having a necessary field. There is no
78 way for the library to recover from this error.
79 TIFF directory is missing requred "StripOffsets" field. The image has
81 multiple strips, but is missing the tag that specifies the file offset
82 to each strip of data. There is no way for the library to recover from
83 this error.
84 TIFF directory is missing requred "TileOffsets" field. The image has
86 multiple tiles, but is missing the tag that specifies the file offset
87 to each tile of data. There is no way for the library to recover from
88 this error.
89 TIFF directory is missing required "StripByteCounts" field. The image
91 has multiple strips, but is missing the tag that specifies the size of
92 each strip of data. There is no way for the library to recover from
93 this error.
94 TIFF directory is missing required "StripByteCounts" field, calculating
96 from imagelength. The image violates the specification by not having a
97 necessary field. However, when the image is comprised of only one
98 strip or tile, the library will estimate the missing value based on the
99 file size.
100 Bogus "StripByteCounts" field, ignoring and calculating from image‐
102 length. Certain vendors violate the specification by writing zero for
103 the StripByteCounts tag when they want to leave the value unspecified.
104 If the image has a single strip, the library will estimate the missing
105 value based on the file size.
106
108 TIFFOpen(3TIFF), TIFFWriteDirectory(3TIFF), TIFFSetDirectory(3TIFF),
109 TIFFSetSubDirectory(3TIFF), libtiff(3TIFF)
110 Libtiff library home page: http://www.remotesensing.org/libtiff/
112libtiff October 15, 1995 TIFFReadDirectory(3TIFF)