TIFFReverseBits

SWAB(3T)                                                              SWAB(3T)



NAME
       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  TIFFSwabArrayOf-
       Long  swap  the  bytes  in an array of 16-bit and 32-bit items, respec-
       tively.

       TIFFReverseBits replaces each byte in data  with  the  equivalent  bit-
       reversed  value.   This  operation is done with a lookup table, TIFFBi-
       tRevTable which is declared public.  A second table,  TIFFNoBitRevTable
       is  also  declared  public; it is a lookup table that can be used as an
       identity function; i.e.  TIFFNoBitRevTable[n] == n.

DIAGNOSTICS
       None.

SEE ALSO
       libtiff(3T),



                               December 16, 1991                      SWAB(3T)