#ifndef __VirtualRingBuffer_H__
#define __VirtualRingBuffer_H__

#include <mach/mach.h>
#include <mach/mach_error.h>
#include <CoreAudio/CoreAudio.h>


class VirtualRingBuffer
{
public:
    void *buffer;
    void *bufferEnd;
    unsigned long bufferLength;
        // buffer is the start of the ring buffer's address space.
        // bufferEnd is the end of the "real" buffer (always buffer + bufferLength).
        // Note that the "virtual" portion of the buffer extends from bufferEnd to bufferEnd+bufferLength.
    void *readPointer;
    void *writePointer;
    mach_port_t memoryEntry;
    
    VirtualRingBuffer(unsigned long);
    ~VirtualRingBuffer(void);
    void clear(void);
    void empty(void);
    unsigned char isEmpty(void);
    unsigned long lengthAvailableToReadReturningPointer(void**);
    void didReadLength(unsigned long);
    unsigned long lengthAvailableToWriteReturningPointer(void**);
    void didWriteLength(unsigned long);
    
private:
    static void *allocateVirtualBuffer(unsigned long, mach_port_t*);
    static void deallocateVirtualBuffer(void*, unsigned long);
};


#endif //__VirtualRingBuffer_H__