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TIFFswab
========
Synopsis
--------
.. highlight:: c
::
#include <tiffio.h>
.. c:function:: const unsigned char* TIFFGetBitRevTable(int reversed)
.. c:function:: void TIFFReverseBits(u_char* data, unsigned long nbytes)
.. c:function:: void TIFFSwabShort(uint16_t* data)
.. c:function:: void TIFFSwabLong(uint32_t* data)
.. c:function:: void TIFFSwabLong8(uint64_t* lp)
.. c:function:: void TIFFSwabFloat(float* fp)
.. c:function:: void TIFFSwabDouble(double *dp)
.. c:function:: void TIFFSwabArrayOfShort(uint16_t* wp, tmsize_t n)
.. c:function:: void TIFFSwabArrayOfTriples(uint8_t* tp, tmsize_t n)
.. c:function:: void TIFFSwabArrayOfLong(uint32_t* lp, tmsize_t n)
.. c:function:: void TIFFSwabArrayOfLong8(uint64_t* lp, tmsize_t n)
.. c:function:: void TIFFSwabArrayOfFloat(float* fp, tmsize_t n)
.. c:function:: 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.
:c:func:`TIFFSwabShort` and :c:func:`TIFFSwabLong` and :c:func:`TIFFSwabFloat`
swap the bytes in a single 16- and 32-bit item, respectively.
:c:func:`TIFFSwabLong8` and :c:func:`TIFFSwabDouble`
swap the bytes in a single 64-bit item.
:c:func:`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.
:c:func:`TIFFSwabArrayOfShort` and :c:func:`TIFFSwabArrayOfLong`,
:c:func:`TIFFSwabArrayOfFloat` swap the bytes in an array of 16- and 32-bit
items, respectively.
:c:func:`TIFFSwabArrayOfLong8` and :c:func:`TIFFSwabArrayOfDouble`
swap the bytes in an array of 64-bit items.
:c:func:`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 :c:func:`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. :c:expr:`TIFFNoBitRevTable[n] == n`.
Diagnostics
-----------
None.
See also
--------
:doc:`libtiff` (3tiff)
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