TIFFReverseBits(3T)      UNIX System V(June 18, 1991)       TIFFReverseBits(3T)


NAME
      TIFFReverseBits, TIFFSwabShort, TIFFSwabLong, TIFFSwabArrayOfShort,
      TIFFSwabArrayOfLong - byte swapping  routines

SYNOPSIS
      #include <tiffio.h>
      extern unsigned char TIFFBitRevTable[256];
      extern unsigned char TIFFNoBitRevTable[256];
      void TIFFReverseBits(uchar* data, int nbytes)
      void TIFFSwabShort(ushort* data)
      void TIFFSwabLong(ulong* data)
      void TIFFSwabArrayOfShort(ushort* data, int nshorts)
      void TIFFSwabArrayOfLong(ushort* data, int 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 done with a lookup table,
      TIFFBitRevTable 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
      intro(3T),




















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