crc8 Class Reference

#include <crc8.h>

Collaboration diagram for crc8:

Public Member Functions
	crc8 ()
	~crc8 ()
int	calc (int dato)
int	current ()

Private Attributes
int	m_crci
int	m_pol
int	m_ma

Detailed Description

Definition at line 8 of file crc8.h.

Constructor & Destructor Documentation

crc8()

crc8::crc8

(

)

Definition at line 12 of file crc8.cxx.

           {
    // cout<<"Inizio della sessione crc8\n";
    m_crci = 0x00;     // crc iniziale,default="00000000"
    m_pol = 0x838000;  // polinomio divisore="1000000111"
    m_ma = 0x800000;   // maschera
}

~crc8()

crc8::~crc8

(

)

Definition at line 19 of file crc8.cxx.

            {
    // cout<<"Fine della sessione crc8\n";
}

Member Function Documentation

calc()

int crc8::calc

(

int

dato

)

Definition at line 29 of file crc8.cxx.

                       {
    int i;
    int masc;
    int poli;
 
    m_crci = m_crci << 16;  // shifta il crc iniziale per metterlo davanti al dato
    dato = dato ^ m_crci;   // mette,tramite xor,il crc davanti al dato
    masc = m_ma;            // carico la maschera
    poli = m_pol;           // carico il polinomio divisore
 
    for (i = 0; i < 16; i++) {
        if (dato & masc)         // tramite AND,individua se il MSB e' 1 e divide
            dato = dato ^ poli;  // divisione tra dato e polinomio
        masc = masc >> 1;        // shift per bit successivo
        poli = poli >> 1;        // shift per bit successivo
    }
    m_crci = dato;  // caricamento del crc ottenuto
    return 0;
}

current()

int crc8::current

(

)

Definition at line 23 of file crc8.cxx.

                  {
    return m_crci;
    // return pol;
    // return ma;
}

Member Data Documentation

m_crci

int crc8::m_crci

private

Definition at line 16 of file crc8.h.

m_ma

int crc8::m_ma

private

Definition at line 18 of file crc8.h.

m_pol

int crc8::m_pol

private

Definition at line 17 of file crc8.h.

---

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

• crc8.h
• crc8.cxx