NAME

       TIFFswab - 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 TIFFSwabLong8(uint64_t *lp)

       void TIFFSwabFloat(float *fp)

       void TIFFSwabDouble(double *dp)

       void TIFFSwabArrayOfShort(uint16_t *wp, tmsize_t n)

       void TIFFSwabArrayOfTriples(uint8_t *tp, tmsize_t n)

       void TIFFSwabArrayOfLong(uint32_t *lp, tmsize_t n)

       void TIFFSwabArrayOfLong8(uint64_t *lp, tmsize_t n)

       void TIFFSwabArrayOfFloat(float *fp, tmsize_t n)

       void TIFFSwabArrayOfDouble(double *dp, tmsize_t n)

DESCRIPTION

       The  following  routines  are  used by the library to swap 16-, 32- and 64-bit data and to
       reverse the order of bits in bytes.

       TIFFSwabShort() and TIFFSwabLong() and TIFFSwabFloat() swap the bytes in a single 16-  and
       32-bit item, respectively.

       TIFFSwabLong8() and TIFFSwabDouble() swap the bytes in a single 64-bit item.

       TIFFSwabArrayOfTriples()  swap  the  first and the third byte of each triple (three bytes)
       within the byte array. The second byte of each triple stays untouched.

       TIFFSwabArrayOfShort() and  TIFFSwabArrayOfLong(), TIFFSwabArrayOfFloat() swap  the  bytes
       in an array of 16- and 32-bit items, respectively.

       TIFFSwabArrayOfLong8()  and  TIFFSwabArrayOfDouble()  swap the bytes in an array of 64-bit
       items.

       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.  The 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)

AUTHOR

       LibTIFF contributors

COPYRIGHT

       1988-2024, LibTIFF contributors