extract()

int datrw::mseed::SEED::Steim2Word::extract ( const int &  b, const int &  p  ) const

private

return masked value

• b number of bits
• p position in word

Definition at line 375 of file seedstructs.cc.

References DATRW_assert, Mword, and value().

Referenced by value().

      {
        DATRW_assert((b>0), "ERROR (Steim2Word::extract): "
                       "use at least 1 byte");
        DATRW_assert((p>=0), "ERROR (Steim2Word::extract): "
                       "illegal position");
        DATRW_assert((p<int(32/b)), "ERROR (Steim2Word::extract): "
                       "illegal position");
        int signmask=int(1 << (b-1));
        int valmask=signmask - 1;
        int nshift=b*p;
        // extract sign bit
        int sign=int((Mword >> nshift) & signmask);
        // extract value bit code
        int value=int((Mword >> nshift) & valmask);
        // construct 32-bit (int size) two's complement value
        int retval= sign ? (value | ~valmask) : value;
        return(retval);
      } // int Steim2Word::extract(const int& p)  const

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