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88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
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/*******************************************************************
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Copyright (C) 2009 FreakLabs
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the the copyright holder nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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Originally written by Christopher Wang aka Akiba.
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Please post support questions to the FreakLabs forum.
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*******************************************************************/
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#include <stdio.h>
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#include "chb_buf.h"
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static U8 chb_buf[CHB_BUF_SZ];
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static U8 rd_ptr, wr_ptr, len;
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/**************************************************************************/
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/*!
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*/
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/**************************************************************************/
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void chb_buf_init()
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{
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rd_ptr = 0;
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wr_ptr = 0;
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len = 0;
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}
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/**************************************************************************/
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/*!
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*/
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/**************************************************************************/
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void chb_buf_write(U8 data)
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{
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chb_buf[wr_ptr] = data;
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wr_ptr = (wr_ptr + 1) % CHB_BUF_SZ;
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len++;
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}
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/**************************************************************************/
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/*!
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*/
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/**************************************************************************/
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U8 chb_buf_read()
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{
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U8 data;
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data = chb_buf[rd_ptr];
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rd_ptr = (rd_ptr + 1) % CHB_BUF_SZ;
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len--;
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return data;
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}
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/**************************************************************************/
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/*!
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*/
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/**************************************************************************/
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U8 chb_buf_get_len()
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{
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return len;
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}
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