LVL1::QuadLinear Class Reference

QuadLinear encoding is used for transmission of ET/Ex/Ey sums from JEM to CMM. More...

#include <QuadLinear.h>

Collaboration diagram for LVL1::QuadLinear:

Static Public Member Functions
static unsigned int	Compress (int Et)
	Compress data.
static unsigned int	Expand (int Code)
	Uncompress data.

Static Private Attributes
static const unsigned int	m_mask = 0x3F
	Mask to select 6-bit field.
static const int	m_nRanges = 4
	Number of ET ranges to encode in.
static const int	m_nShift = 2
	Number of bits to shift by in each step.
static const int	m_Offset = 6
	Offset for compression code.

Detailed Description

QuadLinear encoding is used for transmission of ET/Ex/Ey sums from JEM to CMM.

This class compresses/uncompresses 8 bit ET (JEM energy sums) to/from quad linear scale

Todo

this should probably be a static class.

Definition at line 24 of file QuadLinear.h.

Member Function Documentation

Compress()

unsigned int LVL1::QuadLinear::Compress ( int Et )

static

Compress data.

Definition at line 16 of file QuadLinear.cxx.

                                            {
 
  // Compressed codes are unsigned. Calling function should keep track of sign   
  unsigned int code = abs(Et);
  unsigned int quadEt = m_mask + ((m_nRanges-1)<<m_Offset);
   
  for (int i = 0; i < m_nRanges; i++) {
    if ( code <= m_mask ) {
      quadEt = code + (i<<m_Offset);
      break;
    }
    code >>= m_nShift;
  }
  return quadEt;
}

Expand()

unsigned int LVL1::QuadLinear::Expand ( int Code )

static

Uncompress data.

Definition at line 32 of file QuadLinear.cxx.

                                            {
 
  // Compressed codes are unsigned. Calling function should keep track of sign   
  int range = Code >> m_Offset;
  int Et = Code&m_mask;
  
  return (Et<<= (range*m_nShift));
}

Member Data Documentation

m_mask

const unsigned int LVL1::QuadLinear::m_mask = 0x3F

staticprivate

Mask to select 6-bit field.

Definition at line 34 of file QuadLinear.h.

m_nRanges

const int LVL1::QuadLinear::m_nRanges = 4

staticprivate

Number of ET ranges to encode in.

Definition at line 36 of file QuadLinear.h.

m_nShift

const int LVL1::QuadLinear::m_nShift = 2

staticprivate

Number of bits to shift by in each step.

Definition at line 38 of file QuadLinear.h.

m_Offset

const int LVL1::QuadLinear::m_Offset = 6

staticprivate

Offset for compression code.

Definition at line 40 of file QuadLinear.h.

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

• QuadLinear.h
• QuadLinear.cxx