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/*
* Dropbear SSH
*
* Copyright (c) 2002-2004 Matt Johnston
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE. */
#ifndef DROPBEAR_CIRCBUFFER_H_
#define DROPBEAR_CIRCBUFFER_H_
struct circbuf {
unsigned int size;
unsigned int readpos;
unsigned int writepos;
unsigned int used;
unsigned char* data;
};
typedef struct circbuf circbuffer;
circbuffer * cbuf_new(unsigned int size);
void cbuf_free(circbuffer * cbuf);
unsigned int cbuf_getused(circbuffer * cbuf); /* how much data stored */
unsigned int cbuf_getavail(circbuffer * cbuf); /* how much we can write */
unsigned int cbuf_writelen(circbuffer *cbuf); /* max linear write len */
/* returns pointers to the two portions of the circular buffer that can be read */
void cbuf_readptrs(circbuffer *cbuf,
unsigned char **p1, unsigned int *len1,
unsigned char **p2, unsigned int *len2);
unsigned char* cbuf_writeptr(circbuffer *cbuf, unsigned int len);
void cbuf_incrwrite(circbuffer *cbuf, unsigned int len);
void cbuf_incrread(circbuffer *cbuf, unsigned int len);
#endif
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