arduino-esp32/cores/esp32/cbuf.h
2016-10-06 07:09:44 -06:00

80 lines
1.8 KiB
C++

/*
cbuf.h - Circular buffer implementation
Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
This file is part of the esp8266 core for Arduino environment.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __cbuf_h
#define __cbuf_h
#include <stddef.h>
#include <stdint.h>
#include <string.h>
class cbuf
{
public:
cbuf(size_t size);
~cbuf();
size_t resizeAdd(size_t addSize);
size_t resize(size_t newSize);
size_t available() const;
size_t size();
size_t room() const;
inline bool empty() const
{
return _begin == _end;
}
inline bool full() const
{
return wrap_if_bufend(_end + 1) == _begin;
}
int peek();
size_t peek(char *dst, size_t size);
int read();
size_t read(char* dst, size_t size);
size_t write(char c);
size_t write(const char* src, size_t size);
void flush();
size_t remove(size_t size);
cbuf *next;
private:
inline char* wrap_if_bufend(char* ptr) const
{
return (ptr == _bufend) ? _buf : ptr;
}
size_t _size;
char* _buf;
const char* _bufend;
char* _begin;
char* _end;
};
#endif//__cbuf_h