cirbuf.h
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#ifndef CIRBUF_H
#define CIRBUF_H
#include <stddef.h>
#include <stdlib.h>
#include <stdint.h>
// Optimized circular buffer, works only with sizes power of two.
class CirBuf
{
#ifdef TESTING
friend class MainTests;
#endif
char *buf = NULL;
uint32_t head = 0;
uint32_t tail = 0;
uint32_t size = 0;
time_t resizedAt = 0;
public:
CirBuf(size_t size);
~CirBuf();
uint32_t usedBytes() const;
uint32_t freeSpace() const;
uint32_t maxWriteSize() const;
uint32_t maxReadSize() const;
char *headPtr();
char *tailPtr();
void advanceHead(uint32_t n);
void advanceTail(uint32_t n);
char peakAhead(uint32_t offset) const;
void doubleSize();
uint32_t getSize() const;
time_t bufferLastResizedSecondsAgo() const;
void resetSize(size_t size);
};
#endif // CIRBUF_H