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.\" $Id: TIFFswab.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $
.\"
.\" Copyright (c) 1988-1997 Sam Leffler
.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
.\"
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.if n .po 0
.TH SWAB 3TIFF "November 04, 2004" "libtiff"
.SH NAME
TIFFGetBitRevTable, TIFFReverseBits, TIFFSwabShort, TIFFSwabLong,
TIFFSwabArrayOfShort, TIFFSwabArrayOfLong \- byte- and bit-swapping routines
.SH SYNOPSIS
.B "#include <tiffio.h>"
.sp
.BI "const unsigned char* TIFFGetBitRevTable(int " reversed ")"
.br
.BI "void TIFFReverseBits(u_char *" data ", unsigned long " nbytes ")"
.br
.BI "void TIFFSwabShort(uint16 *" data ")"
.br
.BI "void TIFFSwabLong(uint32 *" data ")"
.br
.BI "void TIFFSwabArrayOfShort(uint16 *" data ", unsigned long " nshorts ")"
.br
.BI "void TIFFSwabArrayOfLong(uint32 *" data ", unsigned long " nlongs ")"
.SH DESCRIPTION
The following routines are used by the library to swap
16- and 32-bit data and to reverse the order of bits in bytes.
.PP
.IR TIFFSwabShort
and
.IR TIFFSwabLong
swap the bytes in a single 16-bit and 32-bit item, respectively.
.IR TIFFSwabArrayOfShort
and
.IR TIFFSwabArrayOfLong
swap the bytes in an array of 16-bit and 32-bit items, respectively.
.PP
.IR TIFFReverseBits
replaces each byte in
.I data
with the equivalent bit-reversed value. This operation is performed with a
lookup table, which is returned using the
.IR TIFFGetBitRevTable
function.
.I reversed
parameter specifies which table should be returned. Supply
.I 1
if you want bit reversal table. Supply
.I 0
to get the table that do not reverse bit values. It is a lookup table that can
be used as an
.IR "identity function" ;
i.e.
.IR "TIFFNoBitRevTable[n] == n" .
.SH DIAGNOSTICS
None.
.SH "SEE ALSO"
.BR libtiff (3TIFF)
.PP
Libtiff library home page:
.BR http://www.remotesensing.org/libtiff/

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