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