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TIFFReadDirectory(3TIFF) TIFFReadDirectory(3TIFF)
NAME
TIFFReadDirectory - get the contents of the next directory in an open TIFF file
SYNOPSIS
#include <tiffio.h>
int TIFFReadDirectory(TIFF *tif)
DESCRIPTION
Read the next directory in the specified file and make it the current directory. Applica-
tions only need to call TIFFReadDirectory to read multiple subfiles in a single TIFF
file-- the first directory in a file is automatically read when TIFFOpen is called.
NOTES
If the library is compiled with STRIPCHOP_SUPPORT enabled, then images that have a single
uncompressed strip or tile of data are automatically treated as if they were made up of
multiple strips or tiles of approximately 8 kilobytes each. This operation is done only
in-memory; it does not alter the contents of the file. However, the construction of the
``chopped strips'' is visible to the application through the number of strips [tiles]
returned by TIFFNumberOfStrips [TIFFNumberOfTiles].
RETURN VALUES
If the next directory was successfully read, 1 is returned. Otherwise, 0 is returned if an
error was encountered, or if there are no more directories to be read.
DIAGNOSTICS
All error messages are directed to the TIFFError(3TIFF) routine. All warning messages are
directed to the TIFFWarning(3TIFF) routine.
Seek error accessing TIFF directory. An error occurred while positioning to the location
of the directory.
Wrong data type %d for field "%s". The tag entry in the directory had an incorrect data
type. For example, an ImageDescription tag with a SHORT data type.
TIFF directory is missing required "%s" field. The specified tag is required to be
present by the TIFF 5.0 specification, but is missing. The directory is (usually) unus-
able.
%s: Rational with zero denominator. A directory tag has a RATIONAL value whose denomina-
tor is zero.
Incorrect count %d for field "%s" (%lu, expecting %lu); tag ignored. The specified tag's
count field is bad. For example, a count other than 1 for a SubFileType tag.
Cannot handle different per-sample values for field "%s". The tag has SamplesPerPixel
values and they are not all the same; e.g. BitsPerSample. The library is unable to han-
dle images of this sort.
Count mismatch for field "%s"; expecting %d, got %d. The count field in a tag does not
agree with the number expected by the library. This should never happen, so if it does,
the library refuses to read the directory.
Invalid TIFF directory; tags are not sorted in ascending order. The directory tags are
not properly sorted as specified in the TIFF 5.0 specification. This error is not fatal.
Ignoring unknown field with tag %d (0x%x). An unknown tag was encountered in the direc-
tory; the library ignores all such tags.
TIFF directory is missing required "ImageLength" field. The image violates the specifica-
tion by not having a necessary field. There is no way for the library to recover from
this error.
TIFF directory is missing required "PlanarConfig" field. The image violates the specifi-
cation by not having a necessary field. There is no way for the library to recover from
this error.
TIFF directory is missing required "StripOffsets" field. The image has multiple strips,
but is missing the tag that specifies the file offset to each strip of data. There is no
way for the library to recover from this error.
TIFF directory is missing required "TileOffsets" field. The image has multiple tiles, but
is missing the tag that specifies the file offset to each tile of data. There is no way
for the library to recover from this error.
TIFF directory is missing required "StripByteCounts" field. The image has multiple
strips, but is missing the tag that specifies the size of each strip of data. There is no
way for the library to recover from this error.
TIFF directory is missing required "StripByteCounts" field, calculating from imagelength.
The image violates the specification by not having a necessary field. However, when the
image is comprised of only one strip or tile, the library will estimate the missing value
based on the file size.
Bogus "StripByteCounts" field, ignoring and calculating from imagelength. Certain vendors
violate the specification by writing zero for the StripByteCounts tag when they want to
leave the value unspecified. If the image has a single strip, the library will estimate
the missing value based on the file size.
SEE ALSO
TIFFOpen(3TIFF), TIFFWriteDirectory(3TIFF), TIFFSetDirectory(3TIFF), TIFFSetSubDirec-
tory(3TIFF), libtiff(3TIFF)
Libtiff library home page: http://www.remotesensing.org/libtiff/
libtiff October 15, 1995 TIFFReadDirectory(3TIFF)
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