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bit 0.4.90 (Default branch)
11-03-2008
bit is a library that makes it easier to dynamically manipulate data buffers containing fields that do not have octet (byte) boundaries. An example is the IP header, which is generally dealt with at compile time via bit fields in a structure. A key feature of the bit library is support for loading data formats described in XML files and dynamically parsing those fields at run time. This library was initially created to support reading various kinds of robotic device I/O (IR sensors, motors), but it has also been used for run time parsing of IP, TCP, UDP, and RTP headers. License: GNU General Public License v3 Changes:|
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SWAB(3TIFF) SWAB(3TIFF) NAME
TIFFGetBitRevTable, TIFFReverseBits, TIFFSwabShort, TIFFSwabLong, TIFFSwabArrayOfShort, TIFFSwabArrayOfLong - byte- and bit-swapping rou- tines 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, 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 ALSO
libtiff(3TIFF) Libtiff library home page: http://www.remotesensing.org/libtiff/ libtiff November 04, 2004 SWAB(3TIFF)