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- .\"
- .\" Copyright (c) 1988-1997 Sam Leffler
- .\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
- .\"
- .\" Permission to use, copy, modify, distribute, and sell this software and
- .\" its documentation for any purpose is hereby granted without fee, provided
- .\" that (i) the above copyright notices and this permission notice appear in
- .\" all copies of the software and related documentation, and (ii) the names of
- .\" Sam Leffler and Silicon Graphics may not be used in any advertising or
- .\" publicity relating to the software without the specific, prior written
- .\" permission of Sam Leffler and Silicon Graphics.
- .\"
- .\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
- .\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
- .\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- .\"
- .\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
- .\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- .\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- .\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
- .\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- .\" OF THIS SOFTWARE.
- .\"
- .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_t *" data ")"
- .br
- .BI "void TIFFSwabLong(uint32_t *" data ")"
- .br
- .BI "void TIFFSwabArrayOfShort(uint16_t *" data ", unsigned long " nshorts ")"
- .br
- .BI "void TIFFSwabArrayOfLong(uint32_t *" 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.simplesystems.org/libtiff/
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