MMDVMHost-Private/RingBuffer.h

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/*
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* Copyright (C) 2006-2009,2012,2013,2015,2016 by Jonathan Naylor G4KLX
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*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef RingBuffer_H
#define RingBuffer_H
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#include "Log.h"
#include <cstdio>
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#include <cassert>
#include <cstring>
template<class T> class CRingBuffer {
public:
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CRingBuffer(unsigned int length, const char* name) :
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m_length(length),
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m_name(name),
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m_buffer(NULL),
m_iPtr(0U),
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m_oPtr(0U)
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{
assert(length > 0U);
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assert(name != NULL);
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m_buffer = new T[length];
::memset(m_buffer, 0x00, m_length * sizeof(T));
}
~CRingBuffer()
{
delete[] m_buffer;
}
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bool addData(const T* buffer, unsigned int nSamples)
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{
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if (nSamples >= freeSpace()) {
LogError("**** Overflow in %s ring buffer, %u >= %u", m_name, nSamples, freeSpace());
return false;
}
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for (unsigned int i = 0U; i < nSamples; i++) {
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m_buffer[m_iPtr++] = buffer[i];
if (m_iPtr == m_length)
m_iPtr = 0U;
}
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return true;
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}
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bool getData(T* buffer, unsigned int nSamples)
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{
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if (dataSize() < nSamples) {
LogError("**** Underflow in %s ring buffer, %u < %u", m_name, dataSize(), nSamples);
return false;
}
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for (unsigned int i = 0U; i < nSamples; i++) {
buffer[i] = m_buffer[m_oPtr++];
if (m_oPtr == m_length)
m_oPtr = 0U;
}
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return true;
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}
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bool peek(T* buffer, unsigned int nSamples)
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{
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if (dataSize() < nSamples) {
LogError("**** Underflow peek in %s ring buffer, %u < %u", m_name, dataSize(), nSamples);
return false;
}
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unsigned int ptr = m_oPtr;
for (unsigned int i = 0U; i < nSamples; i++) {
buffer[i] = m_buffer[ptr++];
if (ptr == m_length)
ptr = 0U;
}
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return true;
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}
void clear()
{
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m_iPtr = 0U;
m_oPtr = 0U;
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::memset(m_buffer, 0x00, m_length * sizeof(T));
}
unsigned int freeSpace() const
{
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if (m_oPtr == m_iPtr)
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return m_length;
if (m_oPtr > m_iPtr)
return m_oPtr - m_iPtr;
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return (m_length + m_oPtr) - m_iPtr;
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}
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unsigned int dataSize() const
{
return m_length - freeSpace();
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}
bool hasSpace(unsigned int length) const
{
return freeSpace() > length;
}
bool hasData() const
{
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return m_oPtr != m_iPtr;
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}
bool isEmpty() const
{
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return m_oPtr == m_iPtr;
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}
private:
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unsigned int m_length;
const char* m_name;
T* m_buffer;
unsigned int m_iPtr;
unsigned int m_oPtr;
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};
#endif