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