LVL1BS::PpmByteStreamReadV1V2Tool::BitReader Class Reference

Collaboration diagram for LVL1BS::PpmByteStreamReadV1V2Tool::BitReader:

Public Member Functions
	BitReader (const std::vector< uint32_t > &ppBlock)
uint32_t	getField (const uint8_t numBits)

Private Attributes
uint32_t	m_ppPointer
uint32_t	m_ppMaxBit
const std::vector< uint32_t > &	m_ppBlock

Detailed Description

Definition at line 81 of file PpmByteStreamReadV1V2Tool.h.

Constructor & Destructor Documentation

BitReader()

LVL1BS::PpmByteStreamReadV1V2Tool::BitReader::BitReader ( const std::vector< uint32_t > & ppBlock )

inline

Definition at line 84 of file PpmByteStreamReadV1V2Tool.h.

      : m_ppPointer (0),
        m_ppMaxBit (31 * ppBlock.size()),
        m_ppBlock (ppBlock)
    {
    }

Member Function Documentation

getField()

uint32_t LVL1BS::PpmByteStreamReadV1V2Tool::BitReader::getField

(

const uint8_t

numBits

)

Definition at line 1158 of file PpmByteStreamReadV1V2Tool.cxx.

{
  if ((m_ppPointer + numBits) <= m_ppMaxBit) {
    uint32_t iWord = m_ppPointer / 31;
    uint8_t iBit = m_ppPointer % 31;
    m_ppPointer += numBits;
 
    uint32_t result;
    if ((iBit + numBits) <= 31) {
      result = ::bitFieldSize(m_ppBlock[iWord], iBit, numBits);
    } else {
      uint8_t nb1 = 31 - iBit;
      uint8_t nb2 = numBits - nb1;
      uint32_t field1 = ::bitFieldSize(m_ppBlock[iWord], iBit, nb1);
      uint32_t field2 = ::bitFieldSize(m_ppBlock[iWord + 1], 0, nb2);
      result = field1 | (field2 << nb1);
    }
 
    return result;
  }
 
  throw std::out_of_range("Requested too much bits from ppm block");
}

Member Data Documentation

m_ppBlock

const std::vector<uint32_t>& LVL1BS::PpmByteStreamReadV1V2Tool::BitReader::m_ppBlock

private

Definition at line 96 of file PpmByteStreamReadV1V2Tool.h.

m_ppMaxBit

uint32_t LVL1BS::PpmByteStreamReadV1V2Tool::BitReader::m_ppMaxBit

private

Definition at line 95 of file PpmByteStreamReadV1V2Tool.h.

m_ppPointer

uint32_t LVL1BS::PpmByteStreamReadV1V2Tool::BitReader::m_ppPointer

private

Definition at line 94 of file PpmByteStreamReadV1V2Tool.h.

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

• PpmByteStreamReadV1V2Tool.h
• PpmByteStreamReadV1V2Tool.cxx