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/**
* Copyright 2011 Bump Technologies, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY BUMP TECHNOLOGIES, INC. ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BUMP TECHNOLOGIES, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of Bump Technologies, Inc.
*
**/
#ifndef RINGBUFFER_H
#define RINGBUFFER_H
#include <stddef.h>
/* Tweak these for potential memory/throughput tradeoffs */
#define RING_SLOTS 3
#define RING_DATA_LEN 1024 * 32
typedef struct bufent {
char data[RING_DATA_LEN];
char *ptr;
size_t left;
struct bufent *next;
} bufent;
typedef struct ringbuffer {
bufent slots[RING_SLOTS];
bufent *head; // reads from the head
bufent *tail; // writes to the tail
size_t used;
} ringbuffer;
void ringbuffer_init(ringbuffer *rb);
char * ringbuffer_read_next(ringbuffer *rb, int * length);
void ringbuffer_read_skip(ringbuffer *rb, int length);
void ringbuffer_read_pop(ringbuffer *rb);
char * ringbuffer_write_ptr(ringbuffer *rb);
void ringbuffer_write_append(ringbuffer *rb, int length);
int ringbuffer_size(ringbuffer *rb);
int ringbuffer_capacity(ringbuffer *rb);
int ringbuffer_is_empty(ringbuffer *rb);
int ringbuffer_is_full(ringbuffer *rb);
#endif /* RINGBUFFER_H */
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