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// --------------------------------------------------------------------------
//
// File
// Name: ReadGatherStream.h
// Purpose: Build a stream (for reading only) out of a number of other streams.
// Created: 10/12/03
//
// --------------------------------------------------------------------------
#ifndef READGATHERSTREAM_H
#define READGATHERSTREAM_H
#include "IOStream.h"
#include <vector>
// --------------------------------------------------------------------------
//
// Class
// Name: ReadGatherStream
// Purpose: Build a stream (for reading only) out of a number of other streams.
// Created: 10/12/03
//
// --------------------------------------------------------------------------
class ReadGatherStream : public IOStream
{
public:
ReadGatherStream(bool DeleteComponentStreamsOnDestruction);
~ReadGatherStream();
private:
ReadGatherStream(const ReadGatherStream &);
ReadGatherStream &operator=(const ReadGatherStream &);
public:
int AddComponent(IOStream *pStream);
void AddBlock(int Component, pos_type Length, bool Seek = false, pos_type SeekTo = 0);
virtual int Read(void *pBuffer, int NBytes, int Timeout = IOStream::TimeOutInfinite);
virtual pos_type BytesLeftToRead();
virtual void Write(const void *pBuffer, int NBytes,
int Timeout = IOStream::TimeOutInfinite);
virtual bool StreamDataLeft();
virtual bool StreamClosed();
virtual pos_type GetPosition() const;
private:
bool mDeleteComponentStreamsOnDestruction;
std::vector<IOStream *> mComponents;
typedef struct
{
pos_type mLength;
pos_type mSeekTo;
int mComponent;
bool mSeek;
} Block;
std::vector<Block> mBlocks;
pos_type mCurrentPosition;
pos_type mTotalSize;
unsigned int mCurrentBlock;
pos_type mPositionInCurrentBlock;
bool mSeekDoneForCurrent;
};
#endif // READGATHERSTREAM_H
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