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/*
* NetworkBuffer.h
*
* Created on: 24 Dec 2016
* Author: David
*/
#ifndef SRC_DUETNG_DUETETHERNET_NETWORKBUFFER_H_
#define SRC_DUETNG_DUETETHERNET_NETWORKBUFFER_H_
#include <cstdint>
#include <cstddef>
// Network buffer class. These buffers are 2K long so that they can accept as much data as the W5500 can provide in one go.
class NetworkBuffer
{
public:
friend class Socket;
// Release this buffer and return the next one in the chain
NetworkBuffer *Release();
// Read 1 character, returning true of successful, false if no data left
bool ReadChar(char& b);
// Read some data
size_t ReadBuffer(uint8_t *buffer, size_t maxLen);
// Return the amount of data available, not including continuation buffers
size_t Remaining() const { return dataLength - readPointer; }
// Return the amount of data available, including continuation buffers
size_t TotalRemaining() const;
bool IsEmpty() const { return readPointer == dataLength; }
static NetworkBuffer *Allocate();
static void AllocateBuffers(unsigned int number);
static const size_t bufferSize = 2048;
private:
NetworkBuffer(NetworkBuffer *n);
NetworkBuffer *next;
size_t dataLength;
size_t readPointer;
uint8_t data[bufferSize];
static NetworkBuffer *freelist;
};
#endif /* SRC_DUETNG_DUETETHERNET_NETWORKBUFFER_H_ */
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