98 lines
2.2 KiB
C++
98 lines
2.2 KiB
C++
/*
|
|
* ZeroTier SDK - Network Virtualization Everywhere
|
|
* Copyright (C) 2011-2019 ZeroTier, Inc. https://www.zerotier.com/
|
|
*
|
|
* This program 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.
|
|
*
|
|
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* --
|
|
*
|
|
* You can be released from the requirements of the license by purchasing
|
|
* a commercial license. Buying such a license is mandatory as soon as you
|
|
* develop commercial closed-source software that incorporates or links
|
|
* directly against ZeroTier software without disclosing the source code
|
|
* of your own application.
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
*
|
|
* Ring buffer implementation for network stack drivers
|
|
*/
|
|
|
|
#ifndef ZT_RINGBUFFER_H
|
|
#define ZT_RINGBUFFER_H
|
|
|
|
#include <cstdint>
|
|
#include <stdlib.h>
|
|
|
|
typedef char bufElementType;
|
|
|
|
class RingBuffer
|
|
{
|
|
private:
|
|
bufElementType * buf;
|
|
size_t size;
|
|
size_t begin;
|
|
size_t end;
|
|
bool wrap;
|
|
|
|
public:
|
|
/**
|
|
* create a RingBuffer with space for up to size elements.
|
|
*/
|
|
explicit RingBuffer(size_t size)
|
|
: size(size),
|
|
begin(0),
|
|
end(0),
|
|
wrap(false)
|
|
{
|
|
buf = new bufElementType[size];
|
|
}
|
|
/*
|
|
RingBuffer(const RingBuffer<T> & ring)
|
|
{
|
|
this(ring.size);
|
|
begin = ring.begin;
|
|
end = ring.end;
|
|
memcpy(buf, ring.buf, sizeof(T) * size);
|
|
}
|
|
*/
|
|
~RingBuffer()
|
|
{
|
|
delete[] buf;
|
|
}
|
|
|
|
// get a reference to the underlying buffer
|
|
bufElementType* get_buf();
|
|
|
|
// adjust buffer index pointer as if we copied data in
|
|
size_t produce(size_t n);
|
|
|
|
// merely reset the buffer pointer, doesn't erase contents
|
|
void reset();
|
|
|
|
// adjust buffer index pointer as if we copied data out
|
|
size_t consume(size_t n);
|
|
|
|
size_t write(const bufElementType * data, size_t n);
|
|
|
|
size_t read(bufElementType * dest, size_t n);
|
|
|
|
size_t count();
|
|
|
|
size_t getFree();
|
|
};
|
|
|
|
#endif // _H
|