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/*
* Copyright (C) 2007-2012 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_QUEUE_BUF_H
#define BU_QUEUE_BUF_H
#include "bu/stream.h"
namespace Bu
{
/**
* A queuing buffer stream class. All data written to this class is
* appended to it, there is no stored position. All data read is read
* from the begining and then thrown away. It operates by using a linked
* list of small buffers, and deallocating or reusing them when it can.
*/
class QueueBuf : public Bu::Stream
{
public:
QueueBuf( int iBlockSize=256 );
virtual ~QueueBuf();
virtual void close();
virtual Bu::size read( void *pBuf, Bu::size nBytes );
virtual Bu::size peek( void *pBuf, Bu::size nBytes );
virtual Bu::size peek( void *pBuf, Bu::size nBytes, Bu::size nSkip );
virtual Bu::size write( const void *pBuf, Bu::size nBytes );
virtual Bu::size tell();
virtual void seek( Bu::size offset );
virtual void setPos( Bu::size pos );
virtual void setPosEnd( Bu::size pos );
virtual bool isEos();
virtual bool isOpen();
virtual void flush();
virtual bool canRead();
virtual bool canWrite();
virtual bool isReadable();
virtual bool isWritable();
virtual bool isSeekable();
virtual bool isBlocking();
virtual void setBlocking( bool bBlocking=true );
virtual void setSize( Bu::size iSize );
virtual size getSize() const;
virtual size getBlockSize() const;
virtual Bu::String getLocation() const;
private:
void addBlock();
void removeBlock();
private:
int iBlockSize;
int iReadOffset;
int iWriteOffset;
Bu::size iTotalSize;
typedef Bu::List<char *> BlockList;
BlockList lBlocks;
};
};
#endif
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