SWAB(3TIFF) Image Format Library C++ Reference Manual 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 *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 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 ALSOlibtiff(3TIFF)
Libtiff library home page: http://www.remotesensing.org/libtiff/
Page 1
