Byte Writer

今度は書き込む方。BYTEとかの定義はReaderと同じと思ってください。

同じように抽象クラス。

class Writer
{
public:
    virtual ~Writer() {}

    void writeByte(BYTE value)
    {
        write(value);
    }

    void writeHalf(HALF value)
    {
        writeByte(static_cast<BYTE>(value >> BITS_PER_BYTE));
        writeByte(static_cast<BYTE>(value));
    }

    void writeWord(WORD value)
    {
        writeHalf(static_cast<HALF>(value >> BITS_PER_HALF));
        writeHalf(static_cast<HALF>(value));
    }

protected:
    virtual void write(BYTE value) = 0;
};

そんでもって具象クラス。

class ByteArrayWriter : public Writer
{
public:
    ByteArrayWriter(BYTE* values, int length) : itr_(values), end_(values + length) {}

protected:
    void write(BYTE value)
    {
        if(itr_ < end_)
        {
            *itr_++ = value;
        }
    }

private:
    BYTE* itr_;
    BYTE* end_;
};