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RingStream.h
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RingStream.h
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#ifndef RingStream_h
#define RingStream_h
/*
* © 2020-2021 Chris Harlow
* All rights reserved.
*
* This file is part of DCC-EX CommandStation-EX
*
* This is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* It is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
*/
#include <Arduino.h>
#include "FSH.h"
class RingStream : public Print {
public:
RingStream( const uint16_t len);
static const int THIS_IS_A_RINGSTREAM=777;
virtual size_t write(uint8_t b);
// This availableForWrite function is subverted from its original intention so that a caller
// can destinguish between a normal stream and a RingStream.
// The Arduino compiler does not support runtime dynamic cast to perform
// an instranceOf check.
// This is necessary since the Print functions are mostly not virtual so
// we cant override the print(__FlashStringHelper *) function.
virtual int availableForWrite() override;
using Print::write;
size_t printFlash(const FSH * flashBuffer);
int read();
int count();
int freeSpace();
void mark(uint8_t b);
bool commit();
uint8_t peekTargetMark();
void flush();
void info();
byte readRawByte();
inline int peek() {
if ((_pos_read==_pos_write) && !_overflow) return -1; // empty
return _buffer[_pos_read];
};
static const byte NO_CLIENT=255;
private:
int _len;
int _pos_write;
int _pos_read;
bool _overflow;
int _mark;
int _count;
byte * _buffer;
char * _flashInsert;
byte _ringClient = NO_CLIENT;
};
#endif