ReadWriteBuffer.h

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#ifndef INCLUDED_ReadWriteBuffer
#define INCLUDED_ReadWriteBuffer

#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif

// ----------------------------------------------------------------------------
// ReadWriteBuffer

class ReadWriteBuffer 
{
public:
    ReadWriteBuffer();

    ReadWriteBuffer(const ReadWriteBuffer &);

    ReadWriteBuffer & operator=(const ReadWriteBuffer &);

    ~ReadWriteBuffer();

    void Deallocate();

    void SetEmpty();

    void SetExternalBuffer(void * a_pBuf, size_t a_nBufSiz, size_t a_nBufLen = 0, size_t a_nGrowBy = 0); // throw std::invalid_argument 

    void SetInternalBuffer(size_t a_nInitialSize, size_t a_nGrowBy = 1024); // throw std::bad_alloc

    char * GetWriteBuffer(size_t a_nMinBytes = 0); // throw std::overflow_error, std::bad_alloc

    void CommitWriteBytes(size_t a_nBytes); // throw std::invalid_argument

    size_t GetWriteSize() const;

    void WriteBytes(const void * a_pBuf, size_t a_nBufLen); // throw std::overflow_error, std::bad_alloc

    const char * GetReadBuffer() const;

    void CommitReadBytes(size_t a_nBytes); // throw std::invalid_argument

    size_t GetReadSize() const;

    void ReadBytes(void * a_pBuf, size_t a_nBufLen); // throw std::invalid_argument

    void Compact();

    bool operator==(const ReadWriteBuffer &) const;

private:
    size_t mBufSiz; 
    size_t mBufLen; 
    size_t mBufIdx; 
    size_t mGrowBy; 
    bool   mIsExt;  
    char * mBuf;    
};

#endif // INCLUDED_ReadWriteBuffer