TBits.cpp

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#include "stdafx.h"
#include "TBits.h"

// Can't use this for convenient notation below:
// using AxPipe::Stock::TBits;
// because the Doxygen get's confused.

namespace AxPipe {
    namespace Stock {

        // Instantiate explicitly to generate code for supported bit-lengths.
        template TBits<128>;                
        template TBits<160>;                
        template TBits<256>;                

        template<int iBits> TBits<iBits>::TBits() {
            ZeroMemory(m_Bits, sizeof m_Bits);
        }

        template<int iBits> TBits<iBits>::TBits(unsigned char *bpInit, int cb) {
            ZeroMemory(m_Bits, sizeof m_Bits);
            CopyMemory(m_Bits, bpInit, cb < sizeof m_Bits ? cb : sizeof m_Bits);
        }

        template<int iBits> void *
        TBits<iBits>::GetLeft(const int n) {
            return &m_Bits;
        }

        template<int iBits> void *
        TBits<iBits>::GetRight(const int n) {
            return &m_Bits[sizeof m_Bits - n/8];
        }

        template<int iBits> TBits<iBits>&
        TBits<iBits>::operator += (const TBits<iBits>& rhs) {
            bool bCarry = false;
            for (int i = sizeof m_Bits; i >= 0; i--) {
                bCarry = (m_Bits[i] += rhs.m_Bits[i] + (unsigned char)bCarry) < rhs.m_Bits[i];
            }
            return *this;
        }

        template<int iBits> TBits<iBits>&
        TBits<iBits>::operator ^=(const TBits<iBits>& rhs) {
            size_t cb = sizeof m_Bits;
            unsigned char *dst = m_Bits;
            const unsigned char *src = rhs.m_Bits;
            while (cb--) {
                *dst++ ^= *src++;
            }
            return *this;
        }

        template<int iBits> TBits<iBits>&
        TBits<iBits>::operator =(const TBits<iBits>& rhs) {
            CopyMemory(&m_Bits, &rhs.m_Bits, sizeof m_Bits);
            return *this;
        }
    }
}

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