74 lines
2.6 KiB
Plaintext
74 lines
2.6 KiB
Plaintext
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.\" $Header: /cvs/maptools/cvsroot/libtiff/man/Attic/TIFFswab.3t,v 1.1 1999-07-27 21:50:27 mike Exp $
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.\"
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.\" Copyright (c) 1988-1997 Sam Leffler
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.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
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.\"
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.\" Permission to use, copy, modify, distribute, and sell this software and
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.\" its documentation for any purpose is hereby granted without fee, provided
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.\" that (i) the above copyright notices and this permission notice appear in
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.\" all copies of the software and related documentation, and (ii) the names of
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.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
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.\" publicity relating to the software without the specific, prior written
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.\" permission of Sam Leffler and Silicon Graphics.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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.\" OF THIS SOFTWARE.
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.\"
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.if n .po 0
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.TH SWAB 3T "December 16, 1991"
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.SH NAME
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TIFFReverseBits, TIFFSwabShort, TIFFSwabLong, TIFFSwabArrayOfShort, TIFFSwabArrayOfLong \- byte- and bit-swapping routines
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.SH SYNOPSIS
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.B "#include <tiffio.h>"
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.br
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.B "const unsigned char* TIFFGetBitRevTable(int reversed);"
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.br
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.B "void TIFFReverseBits(u_char* data, unsigned long nbytes)"
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.br
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.B "void TIFFSwabShort(uint16* data)"
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.br
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.B "void TIFFSwabLong(uint32* data)"
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.br
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.B "void TIFFSwabArrayOfShort(uint16* data, unsigned long nshorts)"
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.br
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.B "void TIFFSwabArrayOfLong(uint32* data, unsigned long nlongs)"
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.SH DESCRIPTION
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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 bytes.
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.PP
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.IR TIFFSwabShort
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and
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.IR TIFFSwabLong
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swap the bytes in a single 16-bit and 32-bit item, respectively.
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.IR TIFFSwabArrayOfShort
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and
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.IR TIFFSwabArrayOfLong
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swap the bytes in an array of 16-bit and 32-bit items, respectively.
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.PP
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.IR TIFFReverseBits
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replaces each byte in
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.I data
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with the equivalent bit-reversed value.
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This operation is done with a lookup table,
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.I TIFFBitRevTable
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which is declared public.
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A second table,
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.I TIFFNoBitRevTable
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is also declared public; it is a lookup table that
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can be used as an
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.IR "identity function" ;
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i.e.
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.IR "TIFFNoBitRevTable[n] == n" .
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.SH DIAGNOSTICS
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None.
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.SH "SEE ALSO"
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.IR libtiff (3T),
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