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Rename

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
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<title>TIFFSTRILEQUERY</title>

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<body>

<h1 align="center">TIFFSTRILEQUERY</h1>

<a href="#NAME">NAME</a> 
<a href="#SYNOPSIS">SYNOPSIS</a> 
<a href="#DESCRIPTION">DESCRIPTION</a> 
<a href="#DIAGNOSTICS">DIAGNOSTICS</a> 
<a href="#NOTE">NOTE</a> 
<a href="#SEE ALSO">SEE ALSO</a> 
<a href="#AUTHOR">AUTHOR</a> 
<a href="#COPYRIGHT">COPYRIGHT</a>

<hr>

TIFFStrileQuery
&minus; get strile byte count and offset

<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>

<pre style="margin-left:15%; margin-top: 1em">#include &lt;tiffio.h&gt;</pre>

uint64_t
TIFFGetStrileByteCount(TIFF *tif, uint32_t strile); 
uint64_t TIFFGetStrileOffset(TIFF *tif, uint32_t strile);
 
uint64_t TIFFGetStrileByteCountWithErr(TIFF *tif, uint32_t
strile, int 
*pbErr); 
uint64_t TIFFGetStrileOffsetWithErr(TIFF *tif, uint32_t
strile, int 
*pbErr);

<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>

Make defer
strile offset/bytecount loading available at runtime and add
per&minus;strile offset/bytecount loading capabilities. Part
of this commit makes the behaviour that was previously met
when libtiff was compiled with
&minus;DDEFER_STRILE_LOAD available for default
builds.

When specifying
the new D (Deferred) TIFFOpen() flag, the
loading of strile offset/bytecount is defered. In that mode,
the StripOffsets / StripByteCounts or
TileOffsets / TileByteCounts arrays are only
loaded when first accessed. This can speed&minus;up the
opening of files stored on the network when just metadata
retrieval is needed.

Another
addition is the capability of loading only the values of the
offset/bytecount of the strile of interest instead of the
whole array. This is enabled with the new O
(Ondemand) flag of TIFFOpen() (which implies
D).

The public
TIFFGetStrileOffset(),
TIFFGetStrileOffsetWithErr(),
TIFFGetStrileByteCount() and
TIFFGetStrileByteCountWithErr() functions have been
added to API. They are of particular interest when using
sparse files (with offset == bytecount == 0) and you
want to detect if a strile is present or not without
decompressing the data, or updating an existing sparse
file.

TIFFGetStrileByteCount()
returns the value of the TileByteCounts / StripByteCounts
array for the specified tile/strile.

TIFFGetStrileByteCountWithErr()
additionally provides pbErr as an int pointer
to an error return variable, which is set to &quot;0&quot;
for successful return or to &quot;1&quot; for an error
return.

TIFFGetStrileOffset()
returns the value of the TileOffsets / StripOffsets array
for the specified tile/strile.

TIFFGetStrileOffsetWithErr()
additionally provides pbErr as an int pointer
to an error return variable, which is set to &quot;0&quot;
for successful return or to &quot;1&quot; for an error
return.

<h2>DIAGNOSTICS
<a name="DIAGNOSTICS"></a>
</h2>

All error
messages are directed to the TIFFErrorExtR() routine.
Likewise, warning messages are directed to the
TIFFWarningExtR() routine.

This
functionality was introduced with libtiff 4.1.

libtiff
(3tiff), TIFFOpen (3tiff),
TIFFDeferStrileArrayWriting (3tiff)

<h2>AUTHOR
<a name="AUTHOR"></a>
</h2>

LibTIFF
contributors

<h2>COPYRIGHT
<a name="COPYRIGHT"></a>
</h2>

1988-2025,
LibTIFF contributors
<hr>
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