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GLAST/LAT > DAQ and FSW > FSW > Doxygen Index > LDT / V0-2-0

Constituent: encdec_unit_test     Tag: linux-gcc

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BA.h File Reference

Bit array structure. More...

#include "PBS/BSWP.ih"

Include dependency graph for BA.h:

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Data Structures
struct	_BA
	Provides the bare minimum context to keep track of a buffered array of bits. Since, in general, the bits are buffered in a temporary structure before being output, they must be flushed. More...
Defines
#define	BA_STORE(_out, _buf)   BSWP__store32b(_out, _buf)
#define	BA_LOAD(_out)   BSWP__load32b(_out)
#define	BA_WRITE_R(_out, _buffer, _to_go, _bits, _n)
#define	BA_WRITE_L(_out, _buffer, _to_go, _bits, _n)
Typedefs
typedef _BA	BA
	Typedef for struct _BA.

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Detailed Description

Bit array structure.

Author:

JJRussell - russell@slac.stanford.edu

   CVS $Id: BA.h,v 1.1 2006/09/13 17:09:07 russell Exp $

Provides a fast way to pack bits into an array. The bits are packed big endian style, i.e. msb -> lsb

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Define Documentation

#define BA_WRITE_L (  _out, _buffer, _to_go, _bits, _n   )

Value: do \ { \ int left = _n - _to_go; \ if (left >= 0) \ { \ /* Not enough room for all the bits, put in what will fit */ \ _buffer <<= _to_go; \ _buffer |= (unsigned)_bits >> (32 - _to_go); \ BA_STORE(_out, _buffer); \ printf ("Storing %x\n", *_out); \ _out++; \ _buffer = 0; \ if (left) \ { \ _buffer |= ((unsigned)_bits << _to_go) >> (32 - left); \ } \ _to_go = 32 - left; \ } \ else \ { \ /* Put the last bits in */ \ _buffer <<= _n; \ _buffer |= (unsigned)_bits >> (32 - _n); \ _to_go -= _n; \ } \ } while (0)

#define BA_WRITE_R (  _out, _buffer, _to_go, _bits, _n   )

Value: do \ { \ int left = _n - _to_go; \ /* _dprintf ("N:%2u B:%x T:%2u L:%3d", _n, _bits, _to_go, left); */ \ if (left >= 0) \ { \ /* Not enough room for all the bits, put in what will fit */ \ _buffer <<= _to_go; \ _buffer |= (unsigned)_bits >> left; \ BA_STORE(_out, _buffer); \ /* _dprintf (" %8.8x", *_out); */ \ _out++; \ /* _buffer = 0; */ \ if (left) \ { \ _buffer = ((unsigned)_bits & ((1 << left) - 1)); \ /* _dprintf (" %8.8x", _buffer); */ \ } \ /* _dprintf ("\n"); */ \ _to_go = 32 - left; \ } \ else \ { \ /* Put the last bits in */ \ _buffer <<= _n; \ _buffer |= (unsigned)_bits; \ /* _dprintf (" %8.8x\n", _buffer); */ \ _to_go -= _n; \ } \ } while (0)

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