SWAB(3TIFF) SWAB(3TIFF)

NAME

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

SYNOPSIS

#include <tiffio.h>

const unsigned char* TIFFGetBitRevTable(int reversed)
void TIFFReverseBits(u_char *data, unsigned long nbytes)
void TIFFSwabShort(uint16_t *data)
void TIFFSwabLong(uint32_t *data)
void TIFFSwabArrayOfShort(uint16_t *data, unsigned long nshorts)
void TIFFSwabArrayOfLong(uint32_t *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
TIFFSwabArrayOfLong 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.simplesystems.org/libtiff/

libtiff November 4, 2004 SWAB(3TIFF)