You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
232 lines
7.2 KiB
232 lines
7.2 KiB
/**
|
|
* Digital Voice Modem - Host Software
|
|
* GPLv2 Open Source. Use is subject to license terms.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* @package DVM / Host Software
|
|
*
|
|
*/
|
|
//
|
|
// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
|
|
// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
|
|
//
|
|
/*
|
|
* Copyright (C) 2006-2009,2012,2013,2015,2016 by Jonathan Naylor G4KLX
|
|
*
|
|
* 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.
|
|
*/
|
|
#if !defined(__RING_BUFFER_H__)
|
|
#define __RING_BUFFER_H__
|
|
|
|
#include "Defines.h"
|
|
#include "Log.h"
|
|
|
|
#include <cstdio>
|
|
#include <cassert>
|
|
#include <cstring>
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Class Declaration
|
|
// Implements a circular buffer for storing data.
|
|
// ---------------------------------------------------------------------------
|
|
|
|
template<class T>
|
|
class HOST_SW_API RingBuffer {
|
|
public:
|
|
/// <summary>Initializes a new instance of the RingBuffer class.</summary>
|
|
/// <param name="length">Length of ring buffer.</param>
|
|
/// <param name="name">Name of buffer.</param>
|
|
RingBuffer(uint32_t length, const char* name) :
|
|
m_length(length),
|
|
m_name(name),
|
|
m_buffer(NULL),
|
|
m_iPtr(0U),
|
|
m_oPtr(0U)
|
|
{
|
|
assert(length > 0U);
|
|
assert(name != NULL);
|
|
|
|
m_buffer = new T[length];
|
|
|
|
::memset(m_buffer, 0x00, m_length * sizeof(T));
|
|
}
|
|
|
|
/// <summary>Finalizes a instance of the RingBuffer class.</summary>
|
|
~RingBuffer()
|
|
{
|
|
delete[] m_buffer;
|
|
}
|
|
|
|
/// <summary>Adds data to the end of the ring buffer.</summary>
|
|
/// <param name="buffer">Data buffer.</param>
|
|
/// <param name="length">Length of data in buffer.</param>
|
|
/// <returns>True, if data is added to ring buffer, otherwise false.</returns>
|
|
bool addData(const T* buffer, uint32_t length)
|
|
{
|
|
if (length >= freeSpace()) {
|
|
LogError(LOG_HOST, "[%s] buffer overflow, clearing the buffer. (%u >= %u)", m_name, length, freeSpace());
|
|
clear();
|
|
return false;
|
|
}
|
|
#if DEBUG_RINGBUFFER
|
|
uint32_t iPtr_BeforeWrite = m_iPtr;
|
|
#endif
|
|
for (uint32_t i = 0U; i < length; i++) {
|
|
m_buffer[m_iPtr++] = buffer[i];
|
|
|
|
if (m_iPtr == m_length)
|
|
m_iPtr = 0U;
|
|
}
|
|
#if DEBUG_RINGBUFFER
|
|
LogDebug(LOG_HOST, "RingBuffer::addData(%s): iPtr_Before = %u, iPtr_After = %u, oPtr = %u, len = %u, len_Written = %u", m_name, iPtr_BeforeWrite, m_iPtr, m_oPtr, m_length, (m_iPtr - iPtr_BeforeWrite));
|
|
#endif
|
|
return true;
|
|
}
|
|
|
|
/// <summary>Gets data from the ring buffer.</summary>
|
|
/// <param name="buffer">Buffer to write data to be retrieved.</param>
|
|
/// <param name="length">Length of data to retrieve.</param>
|
|
/// <returns>True, if data is read from ring buffer, otherwise false.</returns>
|
|
bool getData(T* buffer, uint32_t length)
|
|
{
|
|
if (dataSize() < length) {
|
|
LogError(LOG_HOST, "**** Underflow in %s ring buffer, %u < %u", m_name, dataSize(), length);
|
|
return false;
|
|
}
|
|
#if DEBUG_RINGBUFFER
|
|
uint32_t oPtr_BeforeRead = m_oPtr;
|
|
#endif
|
|
for (uint32_t i = 0U; i < length; i++) {
|
|
buffer[i] = m_buffer[m_oPtr++];
|
|
|
|
if (m_oPtr == m_length)
|
|
m_oPtr = 0U;
|
|
}
|
|
#if DEBUG_RINGBUFFER
|
|
LogDebug(LOG_HOST, "RingBuffer::getData(%s): iPtr = %u, oPtr_Before = %u, oPtr_After = %u, len = %u, len_Read = %u", m_name, m_iPtr, oPtr_BeforeRead, m_oPtr, m_length, (m_oPtr - oPtr_BeforeRead));
|
|
#endif
|
|
return true;
|
|
}
|
|
|
|
/// <summary>Gets data from ring buffer without moving buffer pointers.</summary>
|
|
/// <param name="buffer">Buffer to write data to be retrieved.</param>
|
|
/// <param name="length">Length of data to retrieve.</param>
|
|
/// <returns>True, if data is read from ring buffer, otherwise false.</returns>
|
|
bool peek(T* buffer, uint32_t length)
|
|
{
|
|
if (dataSize() < length) {
|
|
LogError(LOG_HOST, "**** Underflow peek in %s ring buffer, %u < %u", m_name, dataSize(), length);
|
|
return false;
|
|
}
|
|
|
|
uint32_t ptr = m_oPtr;
|
|
for (uint32_t i = 0U; i < length; i++) {
|
|
buffer[i] = m_buffer[ptr++];
|
|
|
|
if (ptr == m_length)
|
|
ptr = 0U;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <summary>Clears ring buffer and resets data pointers.</summary>
|
|
void clear()
|
|
{
|
|
m_iPtr = 0U;
|
|
m_oPtr = 0U;
|
|
|
|
::memset(m_buffer, 0x00, m_length * sizeof(T));
|
|
}
|
|
|
|
/// <summary>Resizes the ring buffer to the specified length.</summary>
|
|
/// <param name="length">New length of the ring buffer.</param>
|
|
void resize(uint32_t length)
|
|
{
|
|
clear();
|
|
|
|
delete[] m_buffer;
|
|
|
|
m_length = length;
|
|
m_buffer = new T[length];
|
|
|
|
clear();
|
|
}
|
|
|
|
/// <summary>Returns the currently available space in the ring buffer.</summary>
|
|
/// <returns>Space free in the ring buffer.</returns>
|
|
uint32_t freeSpace() const
|
|
{
|
|
uint32_t len = m_length;
|
|
|
|
if (m_oPtr > m_iPtr)
|
|
len = m_oPtr - m_iPtr;
|
|
else if (m_iPtr > m_oPtr)
|
|
len = m_length - (m_iPtr - m_oPtr);
|
|
|
|
if (len > m_length)
|
|
len = 0U;
|
|
|
|
return len;
|
|
}
|
|
|
|
/// <summary>Returns the size of the data currently stored in the ring buffer.</summary>
|
|
/// <returns>Size of data stored in the ring buffer.</returns>
|
|
uint32_t dataSize() const
|
|
{
|
|
return m_length - freeSpace();
|
|
}
|
|
|
|
/// <summary>Gets the length of the ring buffer.</summary>
|
|
/// <returns>Length of ring buffer.</returns>
|
|
uint32_t length() const
|
|
{
|
|
return m_length;
|
|
}
|
|
|
|
/// <summary>Helper to test if the given length of data would fit in the ring buffer.</summary>
|
|
/// <returns>True, if specified length will fit in buffer, otherwise false.</returns>
|
|
bool hasSpace(uint32_t length) const
|
|
{
|
|
return freeSpace() > length;
|
|
}
|
|
|
|
/// <summary>Helper to return whether the ring buffer contains data.</summary>
|
|
/// <returns>True, if ring buffer contains data, otherwise false.</returns>
|
|
bool hasData() const
|
|
{
|
|
return m_oPtr != m_iPtr;
|
|
}
|
|
|
|
/// <summary>Helper to return whether the ring buffer is empty or not.</summary>
|
|
/// <returns>True, if the ring buffer is empty, otherwise false.</returns>
|
|
bool isEmpty() const
|
|
{
|
|
return m_oPtr == m_iPtr;
|
|
}
|
|
|
|
private:
|
|
uint32_t m_length;
|
|
|
|
const char* m_name;
|
|
|
|
T* m_buffer;
|
|
|
|
uint32_t m_iPtr;
|
|
uint32_t m_oPtr;
|
|
};
|
|
|
|
#endif // __RING_BUFFER_H__
|