| author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
| Tue, 06 Jul 2010 15:10:48 +0300 | |
| changeset 30 | 5dc02b23752f |
| parent 0 | 1918ee327afb |
| permissions | -rw-r--r-- |
| 0 | 1 |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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<meta name="generator" content="groff -Thtml, see www.gnu.org"> |
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<title>TIFFReadDirectory</title> |
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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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<hr> |
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<a name="NAME"></a> |
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<h2>NAME</h2> |
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<td width="8%"></td> |
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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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</td> |
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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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</table> |
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<a name="DESCRIPTION"></a> |
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<h2>DESCRIPTION</h2> |
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<td width="91%"> |
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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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<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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<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>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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<!-- INDENTATION --> |
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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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<!-- INDENTATION --> |
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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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<!-- INDENTATION --> |
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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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<!-- INDENTATION --> |
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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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<!-- INDENTATION --> |
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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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<!-- INDENTATION --> |
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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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<!-- INDENTATION --> |
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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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<!-- INDENTATION --> |
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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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<!-- INDENTATION --> |
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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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<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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