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annotate circbuffer.h @ 1612:470aa609c7e4

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 24 Jul 2018 20:19:05 +0800
parents 06d52bcb8094
children
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002-2004 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #ifndef DROPBEAR_CIRCBUFFER_H_
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26 #define DROPBEAR_CIRCBUFFER_H_
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27 struct circbuf {
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28
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29 unsigned int size;
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30 unsigned int readpos;
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31 unsigned int writepos;
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32 unsigned int used;
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33 unsigned char* data;
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34 };
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35
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36 typedef struct circbuf circbuffer;
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37
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38 circbuffer * cbuf_new(unsigned int size);
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39 void cbuf_free(circbuffer * cbuf);
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40
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41 unsigned int cbuf_getused(const circbuffer * cbuf); /* how much data stored */
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42 unsigned int cbuf_getavail(const circbuffer * cbuf); /* how much we can write */
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43 unsigned int cbuf_writelen(const circbuffer *cbuf); /* max linear write len */
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44
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45 /* returns pointers to the two portions of the circular buffer that can be read */
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46 void cbuf_readptrs(const circbuffer *cbuf,
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47 unsigned char **p1, unsigned int *len1,
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48 unsigned char **p2, unsigned int *len2);
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49 unsigned char* cbuf_writeptr(circbuffer *cbuf, unsigned int len);
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50 void cbuf_incrwrite(circbuffer *cbuf, unsigned int len);
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51 void cbuf_incrread(circbuffer *cbuf, unsigned int len);
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52 #endif