BitStream Class Reference

Bit stream struct. More...

#include <ECLCompress.h>

Collaboration diagram for BitStream:

Public Member Functions
	BitStream ()
	Default constructor for ROOT. More...
	BitStream (int n)
	Constructor with the reserved and cleared storage prepared for incoming bits. More...
void	putNBits (unsigned int value, unsigned int n)
	Push n least significant bits of "value" to the stream. More...
unsigned int	getNBits (unsigned int n)
	Fetch n bits. More...
size_t	getPos () const
	Get current position in the stream.
void	setPos (size_t pos)
	Set position in the stream.
std::vector< unsigned int > &	getStore ()
	Get data vector.
void	resize ()
	Resize data vector to the current position.

Protected Attributes
size_t	m_pos
	Current position in the storage.
std::vector< unsigned int >	m_store
	The bit storage.

Detailed Description

Bit stream struct.

Class contains vector of unsigned ints as a storage and current bit position in the storage. One can put and fetch up to 32 bits at once.

Definition at line 28 of file ECLCompress.h.

Constructor & Destructor Documentation

BitStream() [1/2]

BitStream ( )

inline

Default constructor for ROOT.

Current position is at begining of the storage.

Definition at line 33 of file ECLCompress.h.

: m_pos(0), m_store(1, 0) {}

BitStream() [2/2]

BitStream ( int  n )

inlineexplicit

Constructor with the reserved and cleared storage prepared for incoming bits.

Be sure the size is enough for incoming data since the class does not check bounds. Current position is at begining of the storage.

Definition at line 40 of file ECLCompress.h.

Member Function Documentation

getNBits()

unsigned int getNBits ( unsigned int  n )

inline

Fetch n bits.

Update current position accordingly

Parameters

n	– how many bits fetch from the current position in the stream

Returns

n fetched bits

Definition at line 61 of file ECLCompress.h.

putNBits()

void putNBits ( unsigned int  value, unsigned int  n  )

inline

Push n least significant bits of "value" to the stream.

Update current position accordingly.

Parameters

value	– value to put in the stream
n	– how many least signfificant bits of "value" put in the stream (n<=32)

Definition at line 46 of file ECLCompress.h.

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The documentation for this class was generated from the following file:

• ecl/digitization/include/ECLCompress.h