219 lines
7.9 KiB
HTML
219 lines
7.9 KiB
HTML
<!-- Creator : groff version 1.18.1 -->
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<!-- CreationDate: Sat Feb 24 18:37:16 2007 -->
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta name="Content-Style" content="text/css">
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<title>TIFFReadDirectory</title>
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<body>
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<h1 align=center>TIFFReadDirectory</h1>
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<a href="#NAME">NAME</a><br>
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<a href="#SYNOPSIS">SYNOPSIS</a><br>
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<a href="#DESCRIPTION">DESCRIPTION</a><br>
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<a href="#NOTES">NOTES</a><br>
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<a href="#RETURN VALUES">RETURN VALUES</a><br>
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<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
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<a href="#SEE ALSO">SEE ALSO</a><br>
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<a name="NAME"></a>
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<h2>NAME</h2>
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<td width="91%">
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<p><big>TIFFReadDirectory − get the contents of the
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next directory in an open</big> TIFF <big>file</big></p>
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</table>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<p><big><b>#include <tiffio.h></b></big></p>
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<p><big><b>int TIFFReadDirectory(TIFF
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*</b><i>tif</i><b>)</b></big></p>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p><big>Read the next directory in the specified file and
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make it the current directory. Applications only need to
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call <i>TIFFReadDirectory</i> to read multiple subfiles in a
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single</big> TIFF <big>file— the first directory in a
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file is automatically read when <i>TIFFOpen</i> is
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called.</big></p>
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</td>
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</table>
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<a name="NOTES"></a>
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<h2>NOTES</h2>
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<td width="8%"></td>
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<p><big>If the library is compiled with</big>
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STRIPCHOP_SUPPORT <big>enabled, then images that have a
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single uncompressed strip or tile of data are automatically
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treated as if they were made up of multiple strips or tiles
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of approximately 8 kilobytes each. This operation is done
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only in-memory; it does not alter the contents of the file.
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However, the construction of the ‘‘chopped
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strips’’ is visible to the application through
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the number of strips [tiles] returned by
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<i>TIFFNumberOfStrips</i>
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[<i>TIFFNumberOfTiles</i>].</big></p>
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</td>
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</table>
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<a name="RETURN VALUES"></a>
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<h2>RETURN VALUES</h2>
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<td width="8%"></td>
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<td width="91%">
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<p><big>If the next directory was successfully read, 1 is
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returned. Otherwise, 0 is returned if an error was
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encountered, or if there are no more directories to be
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read.</big></p>
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</td>
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</table>
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<a name="DIAGNOSTICS"></a>
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<h2>DIAGNOSTICS</h2>
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<p><big>All error messages are directed to the
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<i>TIFFError</i>(3TIFF) routine. All warning messages are
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directed to the <i>TIFFWarning</i>(3TIFF) routine.</big></p>
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<p><big><b>Seek error accessing TIFF directory</b>. An error
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occurred while positioning to the location of the
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directory.</big></p>
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<p><big><b>Wrong data type %d for field "%s"</b>.
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The tag entry in the directory had an incorrect data type.
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For example, an <i>ImageDescription</i> tag with a</big>
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SHORT <big>data type.</big></p>
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<p><big><b>TIFF directory is missing required "%s"
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field</b>. The specified tag is required to be present by
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the</big> TIFF <big>5.0 specification, but is missing. The
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directory is (usually) unusable.</big></p>
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<p><big><b>%s: Rational with zero denominator</b>. A
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directory tag has a</big> RATIONAL <big>value whose
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denominator is zero.</big></p>
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<p><big><b>Incorrect count %d for field "%s" (%lu,
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expecting %lu); tag ignored</b>. The specified tag’s
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count field is bad. For example, a count other than 1 for a
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<i>SubFileType</i> tag.</big></p>
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<p><big><b>Cannot handle different per-sample values for
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field "%s"</b>. The tag has <i>SamplesPerPixel</i>
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values and they are not all the same; e.g.
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<i>BitsPerSample</i>. The library is unable to handle images
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of this sort.</big></p>
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<p><big><b>Count mismatch for field "%s";
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expecting %d, got %d</b>. The count field in a tag does not
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agree with the number expected by the library. This should
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never happen, so if it does, the library refuses to read the
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directory.</big></p>
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<p><big><b>Invalid TIFF directory; tags are not sorted in
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ascending order</b>. The directory tags are not properly
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sorted as specified in the</big> TIFF <big>5.0
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specification. This error is not fatal.</big></p>
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<p><big><b>Ignoring unknown field with tag %d (0x%x)</b>. An
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unknown tag was encountered in the directory; the library
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ignores all such tags.</big></p>
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<p><big><b>TIFF directory is missing requred
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"ImageLength" field</b>. The image violates the
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specification by not having a necessary field. There is no
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way for the library to recover from this error.</big></p>
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<p><big><b>TIFF directory is missing requred
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"PlanarConfig" field</b>. The image violates the
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specification by not having a necessary field. There is no
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way for the library to recover from this error.</big></p>
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<p><big><b>TIFF directory is missing requred
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"StripOffsets" field</b>. The image has multiple
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strips, but is missing the tag that specifies the file
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offset to each strip of data. There is no way for the
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library to recover from this error.</big></p>
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<p><big><b>TIFF directory is missing requred
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"TileOffsets" field</b>. The image has multiple
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tiles, but is missing the tag that specifies the file offset
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to each tile of data. There is no way for the library to
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recover from this error.</big></p>
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<p><big><b>TIFF directory is missing required
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"StripByteCounts" field</b>. The image has
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multiple strips, but is missing the tag that specifies the
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size of each strip of data. There is no way for the library
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to recover from this error.</big></p>
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<p><big><b>TIFF directory is missing required
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"StripByteCounts" field, calculating from
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imagelength</b>. The image violates the specification by not
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having a necessary field. However, when the image is
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comprised of only one strip or tile, the library will
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estimate the missing value based on the file size.</big></p>
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<p><big><b>Bogus "StripByteCounts" field, ignoring
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and calculating from imagelength</b>. Certain vendors
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violate the specification by writing zero for the
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StripByteCounts tag when they want to leave the value
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unspecified. If the image has a single strip, the library
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will estimate the missing value based on the file
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size.</big></p>
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</td>
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</table>
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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<!-- INDENTATION -->
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="8%"></td>
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<td width="91%">
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<p><big><b>TIFFOpen</b>(3TIFF),
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<b>TIFFWriteDirectory</b>(3TIFF),
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<b>TIFFSetDirectory</b>(3TIFF),
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<b>TIFFSetSubDirectory</b>(3TIFF),
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<b>libtiff</b>(3TIFF)</big></p>
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<p><big>Libtiff library home page:
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<b>http://www.remotesensing.org/libtiff/</b></big></p>
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</td>
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</table>
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<hr>
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</body>
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</html>
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