CxxUtils::CMurmurHash2A Class Reference

#include <MurmurHash2.h>

Collaboration diagram for CxxUtils::CMurmurHash2A:

Public Member Functions
void	Begin (uint32_t seed=0)
void	Add (const unsigned char *data, int len)
uint32_t	End (void)

Private Member Functions
void	MixTail (const unsigned char *&data, int &len)

Private Attributes
uint32_t	m_hash
uint32_t	m_tail
uint32_t	m_count
uint32_t	m_size

Static Private Attributes
static constexpr uint32_t	M = 0x5bd1e995
static constexpr int	R = 24

Detailed Description

Definition at line 59 of file MurmurHash2.h.

Member Function Documentation

Add()

void CxxUtils::CMurmurHash2A::Add ( const unsigned char *  data, int  len  )

inline

Definition at line 71 of file MurmurHash2.h.

  {
    m_size += len;
 
    MixTail(data,len);
 
    while(len >= 4)
    {
      uint32_t k = *(uint32_t*)data;
 
      MurmurHash_mmix(m_hash,k);
 
      data += 4;
      len -= 4;
    }
 
    MixTail(data,len);
  }

Begin()

void CxxUtils::CMurmurHash2A::Begin ( uint32_t  seed = 0 )

inline

Definition at line 63 of file MurmurHash2.h.

  {
    m_hash  = seed;
    m_tail  = 0;
    m_count = 0;
    m_size  = 0;
  }

End()

uint32_t CxxUtils::CMurmurHash2A::End ( void  )

inline

Definition at line 90 of file MurmurHash2.h.

  {
    MurmurHash_mmix(m_hash,m_tail);
    MurmurHash_mmix(m_hash,m_size);
 
    m_hash ^= m_hash >> 13;
    m_hash *= M;
    m_hash ^= m_hash >> 15;
 
    return m_hash;
  }

MixTail()

void CxxUtils::CMurmurHash2A::MixTail ( const unsigned char *&  data, int &  len  )

inlineprivate

Definition at line 107 of file MurmurHash2.h.

  {
    while( len && ((len<4) || m_count) )
    {
      m_tail |= (*data++) << (m_count * 8);
 
      m_count++;
      len--;
 
      if(m_count == 4)
      {
        MurmurHash_mmix(m_hash,m_tail);
        m_tail = 0;
        m_count = 0;
      }
    }
  }

Member Data Documentation

M

constexpr uint32_t CxxUtils::CMurmurHash2A::M = 0x5bd1e995

staticconstexprprivate

Definition at line 104 of file MurmurHash2.h.

m_count

uint32_t CxxUtils::CMurmurHash2A::m_count

private

Definition at line 127 of file MurmurHash2.h.

m_hash

uint32_t CxxUtils::CMurmurHash2A::m_hash

private

Definition at line 125 of file MurmurHash2.h.

m_size

uint32_t CxxUtils::CMurmurHash2A::m_size

private

Definition at line 128 of file MurmurHash2.h.

m_tail

uint32_t CxxUtils::CMurmurHash2A::m_tail

private

Definition at line 126 of file MurmurHash2.h.

R

constexpr int CxxUtils::CMurmurHash2A::R = 24

staticconstexprprivate

Definition at line 105 of file MurmurHash2.h.

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

• MurmurHash2.h