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