File content as of revision 0:2d90573426d7:

/* Copyright (c) 2010-2011 mbed.org, MIT License
*
* 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 CIRCBUFFER_H
#define CIRCBUFFER_H

template <class T>
class CircBuffer
{
public:
    CircBuffer( int length )
    {
        write = 0;
        read = 0;
        size = length + 1;
        buf = ( T * )malloc( size * sizeof( T ) );
    };

    bool isFull()
    {
        return ( ( write + 1 ) % size == read );
    };

    bool isEmpty()
    {
        return ( read == write );
    };

    void queue( T k )
    {
        if ( isFull() )
        {
            read++;
            read %= size;
        }

        buf[write++] = k;
        write %= size;
    }

    uint16_t available()
    {
        return ( write >= read ) ? write - read : size - read + write;
    };

    bool dequeue( T *c )
    {
        bool empty = isEmpty();

        if ( !empty )
        {
            *c = buf[read++];
            read %= size;
        }

        return( !empty );
    };

private:
    volatile uint16_t write;
    volatile uint16_t read;
    uint16_t size;
    T *buf;
};

#endif