swaplwbytes(3) [ultrix man page]

swap_lw_bytes(3)					     Library Functions Manual						  swap_lw_bytes(3)

Name
       swap_lw_bytes, swap_word_bytes, swap_words - perform byte swapping operations

Syntax
       unsigned int swap_lw_bytes(buffer)
       unsigned int buffer;

       unsigned int swap_word_bytes(buffer)
       unsigned int buffer;

       unsigned int swap_words(buffer)
       unsigned int buffer;

Arguments
       buffer	 Specifies a 32-bit (4 bytes) quantity.

Description
       The  routine performs a long word byte swap.  The routine performs a short word byte swap.  The routine performs a word byte swap.  Because
       Digital devices support the little endian model of byte ordering, there is a need for these byte swapping routines.

       For the purposes of the following discussion, a long word is equal to 4 bytes; a short word is equal to 2 bytes; and 1 byte is equal  to  8
       bits.  The routine takes the 32-bit quantity specified by the buffer argument and swaps all four bytes.	The routine takes the 32-bit quan-
       tity specified by the buffer argument and swaps the individual bytes that make up each byte of the 32-bit quantity.  The routine takes  the
       32-bit quantity specified by the buffer argument and swaps the two words.

Return Values
       These routines return the result of the byte swapping.

																  swap_lw_bytes(3)

SWAB(3TIFF)															       SWAB(3TIFF)

NAME

       TIFFGetBitRevTable,  TIFFReverseBits,  TIFFSwabShort, TIFFSwabLong, TIFFSwabArrayOfShort, TIFFSwabArrayOfLong - byte- and bit-swapping rou-
       tines

SYNOPSIS

       #include <tiffio.h>

       const unsigned char* TIFFGetBitRevTable(int reversed)
       void TIFFReverseBits(u_char *data, unsigned long nbytes)
       void TIFFSwabShort(uint16 *data)
       void TIFFSwabLong(uint32 *data)
       void TIFFSwabArrayOfShort(uint16 *data, unsigned long nshorts)
       void TIFFSwabArrayOfLong(uint32 *data, unsigned long nlongs)

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.

       TIFFSwabShort and TIFFSwabLong swap the bytes in a single 16-bit and 32-bit item, respectively.	TIFFSwabArrayOfShort and  TIFFSwabArrayOf-
       Long swap the bytes in an array of 16-bit and 32-bit items, respectively.

       TIFFReverseBits	replaces  each byte in data with the equivalent bit-reversed value. This operation is performed with a lookup table, which
       is returned using the TIFFGetBitRevTable function.  reversed parameter specifies which table should be returned. Supply 1 if you  want  bit
       reversal  table.  Supply  0 to get the table that do not reverse bit values. It is a lookup table that can be used as an identity function;
       i.e.  TIFFNoBitRevTable[n] == n.

DIAGNOSTICS

       None.

SEE ALSO

       libtiff(3TIFF)

       Libtiff library home page: http://www.remotesensing.org/libtiff/

libtiff 							 November 04, 2004						       SWAB(3TIFF)