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/*
* Copyright (c) 2007, Michael Feathers, James Grenning and Bas Vodde
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE EARLIER MENTIONED AUTHORS ``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 <copyright holder> 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.
*/
#include "CircularBuffer.h"
#include "Printer.h"
CircularBuffer::CircularBuffer(int _capacity) :
index(0), outdex(0), capacity(_capacity), empty(true), full(false)
{
buffer = new int[this->capacity];
}
CircularBuffer::~CircularBuffer()
{
delete[] buffer;
}
bool CircularBuffer::IsEmpty()
{
return empty;
}
bool CircularBuffer::IsFull()
{
return full;
}
void CircularBuffer::Put(int i)
{
empty = false;
buffer[index] = i;
index = Next(index);
if (full) outdex = Next(outdex);
else if (index == outdex) full = true;
}
int CircularBuffer::Get()
{
int result = -1;
full = false;
if (!empty) {
result = buffer[outdex];
outdex = Next(outdex);
if (outdex == index) empty = true;
}
return result;
}
int CircularBuffer::Capacity()
{
return capacity;
}
int CircularBuffer::Next(int i)
{
if (++i >= capacity) i = 0;
return i;
}
void CircularBuffer::Print(Printer* p)
{
p->Print("Circular buffer content:\n<");
int printIndex = outdex;
int count = index - outdex;
if (!empty && (index <= outdex)) count = capacity - (outdex - index);
for (int i = 0; i < count; i++) {
p->Print(buffer[printIndex]);
printIndex = Next(printIndex);
if (i + 1 != count) p->Print(", ");
}
p->Print(">\n");
}
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