//---------------------------------------------------------------------------

#ifndef XInputByteBufferH
#define XInputByteBufferH
//---------------------------------------------------------------------------
#ifndef XByteBufferH
#include <XByteBuffer.h>
#endif

namespace zdhsoft
{

class XEReadBufferFail : public Exception //讀取緩沖區失敗
{
public:
    XEReadBufferFail(int iHelpContext=0);
private:
};

class XInputByteBuffer
{
public:
    XInputByteBuffer(const XByteBuffer & aBuffer);
    XInputByteBuffer(const XInputByteBuffer & aInputByteBuffer);
    XInputByteBuffer & operator=(const XInputByteBuffer & aInputByteBuffer)
    {
        m_Buffer = aInputByteBuffer.m_Buffer;
        m_Pos = aInputByteBuffer.m_Pos;
        return *this;
    }
    //method
    int GetPos() const { return m_Pos; }
    void MoveToBegin() { SetPos(0); }
    void MoveToEnd() { SetPos(m_Buffer->GetLength()-1);  }
    void SetPos(int v)
    {
        int iLen = m_Buffer->GetLength();
        if( v >= iLen ) v = iLen;
        if( v < 0 ) v = -1;
        m_Pos = v;
    }
    bool IsBof() const
    {
        if( m_Buffer->GetLength() == 0 ) return true;
        if( m_Pos < 0 ) return true;
        else return false;
    }
    bool IsEof() const
    {
        if( m_Pos >= m_Buffer->GetLength() ) return true;
        else return false;
    }
    XInputByteBuffer & operator+=(int aOffset)
    {
        SetPos(m_Pos + aOffset);
        return *this;
    }
    XInputByteBuffer & operator-=(int aOffset)
    {
        SetPos(m_Pos - aOffset);
        return *this;
    }
    XInputByteBuffer & operator++(int)
    {
        SetPos(m_Pos + 1);
        return *this;
    }
    XInputByteBuffer operator++()
    {
        XInputByteBuffer tmp( *this );
        SetPos(m_Pos + 1);
        return tmp;
    }
    XInputByteBuffer & operator--(int)
    {
        SetPos(m_Pos - 1);
        return *this;
    }
    XInputByteBuffer operator--()
    {
        XInputByteBuffer tmp( *this );
        SetPos(m_Pos - 1);
        return tmp;
    }
//
    bool IsCanRead(int iPos,int iSize)
    {
        if( iSize < 1 ) return false;
        if( iPos < 0 || iPos >= m_Buffer->GetLength() ) return false;
        if( iPos + iSize > m_Buffer->GetLength() ) return false;
        return true;
    }

    bool GetBool(XBoolean & v)
    {
        if( IsCanRead( m_Pos,sizeof(XBoolean) ) )
        {
            if( m_Buffer->operator[](m_Pos++) == 0) v = false;
            else v = true;
            return true;
        }else return false;
    }
    bool GetByte(XByte & v)
    {
        if( IsCanRead( m_Pos,sizeof(XByte) ) )
        {
            v = m_Buffer->operator[](m_Pos++);
            return true;
        }else return false;
    }
    bool GetChar(XChar &v)
    {
        if( IsCanRead( m_Pos,sizeof(XChar) ) )
        {
            v =(XChar)m_Buffer->operator[](m_Pos++);
            return true;
        }else return false;
    }
    bool GetWord(XWord &v)
    {
        if( IsCanRead( m_Pos,sizeof(XWord) ) )
        {
            v = m_Buffer->GetWordValue(m_Pos);
            m_Pos += sizeof(XWord);
            return true;
        }else return false;
    }
    bool GetShort(XShort & v)
    {
        if( IsCanRead( m_Pos,sizeof(XShort) ) )
        {
            v = m_Buffer->GetShortValue(m_Pos);
            m_Pos += sizeof(XShort);
            return true;
        }else return false;
    }
    bool GetDWord(XDWord &v)
    {
        if( IsCanRead( m_Pos,sizeof(XDWord) ) )
        {
            v = m_Buffer->GetDWordValue(m_Pos);
            m_Pos += sizeof(XDWord);
            return true;
        }else return false;
    }
    bool GetInt(XInt & v)
    {
        if( IsCanRead( m_Pos,sizeof(XInt) ) )
        {
            v = m_Buffer->GetIntValue(m_Pos);
            m_Pos += sizeof(XInt);
            return true;
        }else return false;
    }
    bool GetDDWord(XDDWord &v)
    {
        if( IsCanRead( m_Pos,sizeof(XDDWord) ) )
        {
            v = m_Buffer->GetDDWordValue(m_Pos);
            m_Pos += sizeof(XDDWord);
            return true;
        }else return false;
    }
    bool GetLong(XLong & v)
    {
        if( IsCanRead( m_Pos,sizeof(XLong) ) )
        {
            v = m_Buffer->GetLongValue(m_Pos);
            m_Pos += sizeof(XLong);
            return true;
        }else return false;
    }
    bool GetFloat(XFloat & v)
    {
        if( IsCanRead( m_Pos, sizeof(XFloat) ) )
        {
            v = m_Buffer->GetFloatValue(m_Pos);
            m_Pos += sizeof(XFloat);
            return true;
        }else return false;
    }
    bool GetDouble(XDouble & v)
    {
        if( IsCanRead( m_Pos, sizeof(XDouble) ) )
        {
            v = m_Buffer->GetDoubleValue(m_Pos);
            m_Pos += sizeof(XDouble);
            return true;
        }else return false;
    }
    bool GetLongDouble(XLongDouble & v)
    {
        if( IsCanRead( m_Pos, sizeof(XDouble) ) )
        {
            v = m_Buffer->GetLongDoubleValue(m_Pos);
            m_Pos += sizeof(XLongDouble);
            return true;
        }else return false;
    }
    bool GetData(void * aData,int iSize)
    {
        if( iSize <= 0 ) return true;
        if( IsCanRead( m_Pos, iSize ))
        {
            m_Buffer->GetDataValue(m_Pos,aData,iSize);
            m_Pos += iSize;
            return true;
        }else return false;
    }

//
    XByte GetByte()
    {
        XByte v;
        if(!GetByte(v)) throw XEReadBufferFail();
        return v;
    }
    XChar GetChar()
    {
        XChar v;
        if(!GetChar(v)) throw XEReadBufferFail();
        return v;
    }
    XWord GetWord()
    {
        XWord v;
        if(!GetWord(v)) throw XEReadBufferFail();
        return v;
    }
    XShort GetShort()
    {
        XShort v;
        if(!GetShort(v)) throw XEReadBufferFail();
        return v;
    }
    XDWord GetDWord()
    {
        XDWord v;
        if(!GetDWord(v)) throw XEReadBufferFail();
        return v;
    }
    XInt GetInt()
    {
        XInt v;
        if(!GetInt(v)) throw XEReadBufferFail();
        return v;
    }
    XDDWord GetDDWord()
    {
        XDDWord v;
        if(!GetDDWord(v)) throw XEReadBufferFail();
        return v;
    }
    XLong GetLong()
    {
        XLong v;
        if(!GetLong(v)) throw XEReadBufferFail();
        return v;
    }
    XBoolean GetBool()
    {
        XBoolean v;
        if(!GetBool(v)) throw XEReadBufferFail();
        return v;
    }
    XFloat GetFloat()
    {
        XFloat v;
        if(!GetFloat(v)) throw XEReadBufferFail();
        return v;
    }
    XDouble GetDouble()
    {
        XDouble v;
        if(!GetDouble(v)) throw XEReadBufferFail();
        return v;
    }
    XLongDouble GetLongDouble()
    {
        XLongDouble v;
        if(!GetLongDouble(v)) throw XEReadBufferFail();
        return v;
    }
    XInputByteBuffer & operator>>(XBoolean & v)
    {
        if( IsCanRead( m_Pos,sizeof(XBoolean) ) )
        {
            if( m_Buffer->operator[](m_Pos++) == 0) v = false;
            else v = true;
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XByte & v)
    {
        if( IsCanRead( m_Pos,sizeof(XByte) ) )
        {
            v = m_Buffer->operator[](m_Pos++);
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XChar &v)
    {
        if( IsCanRead( m_Pos,sizeof(XChar) ) )
        {
            v =(XChar)m_Buffer->operator[](m_Pos++);
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XWord &v)
    {
        if( IsCanRead( m_Pos,sizeof(XWord) ) )
        {
            v = m_Buffer->GetWordValue(m_Pos);
            m_Pos += sizeof(XWord);
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XShort & v)
    {
        if( IsCanRead( m_Pos,sizeof(XShort) ) )
        {
            v = m_Buffer->GetShortValue(m_Pos);
            m_Pos += sizeof(XShort);
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XDWord &v)
    {
        if( IsCanRead( m_Pos,sizeof(XDWord) ) )
        {
            v = m_Buffer->GetDWordValue(m_Pos);
            m_Pos += sizeof(XDWord);
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XInt & v)
    {
        if( IsCanRead( m_Pos,sizeof(XInt) ) )
        {
            v = m_Buffer->GetIntValue(m_Pos);
            m_Pos += sizeof(XInt);
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XDDWord &v)
    {
        if( IsCanRead( m_Pos,sizeof(XDDWord) ) )
        {
            v = m_Buffer->GetDDWordValue(m_Pos);
            m_Pos += sizeof(XDDWord);
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XLong & v)
    {
        if( IsCanRead( m_Pos,sizeof(XLong) ) )
        {
            v = m_Buffer->GetLongValue(m_Pos);
            m_Pos += sizeof(XLong);
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XFloat & v)
    {
        if( IsCanRead( m_Pos, sizeof(XFloat) ) )
        {
            v = m_Buffer->GetFloatValue(m_Pos);
            m_Pos += sizeof(XFloat);
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XDouble & v)
    {
        if( IsCanRead( m_Pos, sizeof(XDouble) ) )
        {
            v = m_Buffer->GetDoubleValue(m_Pos);
            m_Pos += sizeof(XDouble);
        }
        return *this;
    }
    XInputByteBuffer & operator>>(XLongDouble & v)
    {
        if( IsCanRead( m_Pos, sizeof(XDouble) ) )
        {
            v = m_Buffer->GetLongDoubleValue(m_Pos);
            m_Pos += sizeof(XLongDouble);
        }
        return *this;
    }

    //property
    __property int Pos = { read = GetPos ,write = SetPos };

private:
    const XByteBuffer * m_Buffer;
    int m_Pos;
};

};
#endif