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#ifndef BU_NIDS_H
#define BU_NIDS_H
#include <stdint.h>
#include "bu/bitstring.h"
namespace Bu
{
class Stream;
class NidsStream;
/**
* Numerically Indexed Data Streams. This is a working name so I can
* actually get some code written instead of agonizing over the name.
*
* This is a system for creating streams that contain other streams in
* a flexible block-allocated system.
*/
class Nids
{
friend class NidsStream;
public:
Nids( Bu::Stream &sStore );
virtual ~Nids();
/**
* Create a new Nids system in the assosiated stream. This should be
* used carefully, it will destroy all data already within the stream.
* More options will probably be added soon.
*/
void initialize( int iBlockSize, int iPreAllocate=1 );
/**
* Create a new stream within the Nids system. The ID of the new stream
* is returned.
*/
int createStream( int iPreAllocate=1 );
/**
* Delete a stream that's already within the Nids.
*/
void deleteStream( int iID );
/**
* Return a new Stream object assosiated with the given stream ID.
*/
NidsStream openStream( int iID );
private:
typedef struct Block
{
uint32_t iFirstBlock;
uint32_t iNextBlock;
uint32_t iPrevBlock;
uint32_t iBytesUsed;
uint32_t iReserved;
unsigned char pData[0];
} Block;
enum
{
blockUnused = 0xFFFFFFFFUL
};
void extendStream( int iID, int iBlockCount=1 );
void getBlock( int iIndex, struct Nids::Block *pBlock );
void setBlock( int iIndex, struct Nids::Block *pBlock );
private:
Bu::Stream &sStore;
int iBlockSize;
int iBlocks;
int iBlockStart;
Bu::BitString bsBlockUsed;
};
};
#endif
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