108 lines
3.3 KiB
HTML
108 lines
3.3 KiB
HTML
<!-- Creator : groff version 1.18.1 -->
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<!-- CreationDate: Sun Mar 6 13:59:54 2005 -->
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<html>
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<head>
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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>SWAB</title>
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</head>
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<body>
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<h1 align=center>SWAB</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="#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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<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>TIFFGetBitRevTable, TIFFReverseBits, TIFFSwabShort,
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TIFFSwabLong, TIFFSwabArrayOfShort, TIFFSwabArrayOfLong
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− byte- and bit-swapping routines</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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<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><b>#include <tiffio.h></b></p>
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<p><b>const unsigned char* TIFFGetBitRevTable(int</b>
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<i>reversed</i><b>)<br>
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void TIFFReverseBits(u_char *</b><i>data</i><b>, unsigned
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long</b> <i>nbytes</i><b>)<br>
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void TIFFSwabShort(uint16 *</b><i>data</i><b>)<br>
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void TIFFSwabLong(uint32 *</b><i>data</i><b>)<br>
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void TIFFSwabArrayOfShort(uint16 *</b><i>data</i><b>,
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unsigned long</b> <i>nshorts</i><b>)<br>
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void TIFFSwabArrayOfLong(uint32 *</b><i>data</i><b>,
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unsigned long</b> <i>nlongs</i><b>)</b></p>
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</td>
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</table>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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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>The following routines are used by the library to swap
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16- and 32-bit data and to reverse the order of bits in
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bytes.</p>
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<p><i>TIFFSwabShort</i> and <i>TIFFSwabLong</i> swap the
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bytes in a single 16-bit and 32-bit item, respectively.
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<i>TIFFSwabArrayOfShort</i> and <i>TIFFSwabArrayOfLong</i>
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swap the bytes in an array of 16-bit and 32-bit items,
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respectively.</p>
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<p><i>TIFFReverseBits</i> replaces each byte in <i>data</i>
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with the equivalent bit-reversed value. This operation is
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performed with a lookup table, which is returned using the
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<i>TIFFGetBitRevTable</i> function. <i>reversed</i>
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parameter specifies which table should be returned. Supply
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<i>1</i> if you want bit reversal table. Supply <i>0</i> to
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get the table that do not reverse bit values. It is a lookup
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table that can be used as an <i>identity function</i>; i.e.
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<i>TIFFNoBitRevTable[n] == n</i>.</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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<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>None.</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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<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><i>libtiff</i>(3TIFF),</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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