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/***************************************************************************
multibuffer.cpp
-------------------
begin : Sat Aug 20 2005
copyright : (C) 2005 by Martin Witte
email : witte@kawo1.rwth-aachen.de
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include <klocale.h>
#include "include/multibuffer.h"
MultiBuffer::MultiBuffer(size_t n_buffers, size_t buffersize)
: m_nBuffers(n_buffers),
m_BufferSize(buffersize),
m_currentReadBuffer(m_nBuffers-1), // during wait4read, this will be incremented to 0
m_currentWriteBuffer(0),
m_readLock(n_buffers),
m_errorString(QString::null),
m_error(false)
{
m_readLock += m_nBuffers;
m_buffers = new char* [m_nBuffers];
m_buffersFill = new size_t [m_nBuffers];
for (size_t i = 0; i < m_nBuffers; ++i) {
m_buffers [i] = new char [m_BufferSize];
m_buffersFill[i] = 0;
}
}
MultiBuffer::~MultiBuffer()
{
for (size_t i = 0; i < m_nBuffers; ++i) {
delete m_buffers[i];
}
delete m_buffers;
delete m_buffersFill;
m_buffersFill = NULL;
m_buffers = NULL;
}
size_t MultiBuffer::getAvailableWriteBuffer() const
{
size_t bytesAvailable = m_BufferSize - m_buffersFill[m_currentWriteBuffer];
return m_currentWriteBuffer != m_currentReadBuffer ? bytesAvailable : 0;
}
size_t MultiBuffer::getAvailableReadBuffers() const
{
return m_readLock.available();
}
char *MultiBuffer::lockWriteBuffer(size_t &bufferSize)
{
size_t bytesAvailable = m_BufferSize - m_buffersFill[m_currentWriteBuffer];
if (m_currentWriteBuffer != m_currentReadBuffer && bytesAvailable > 0) {
bufferSize = bytesAvailable;
return m_buffers[m_currentWriteBuffer] + m_buffersFill[m_currentWriteBuffer];
}
/* QString tmp;
IErrorLogClient::staticLogDebug(tmp.sprintf("current input buffer: %li", m_currentInputBuffer));
IErrorLogClient::staticLogDebug(tmp.sprintf("inputAvailableLock: %i", m_inputAvailableLock.available()));
for (size_t i = 0; i < m_config.m_EncodeBufferCount; ++i) {
IErrorLogClient::staticLogDebug(tmp.sprintf("input buffer %li: fill = %li", i, m_buffersInputFill[i]));
}
*/
/* m_error = true;
m_errorString += i18n("Buffer Overflow. ");*/
return NULL;
}
bool MultiBuffer::unlockWriteBuffer(size_t bufferSize) // return value: complete buffer ready for read
{
bool retval = false;
if (m_buffersFill[m_currentWriteBuffer] + bufferSize > m_BufferSize) {
m_error = true;
m_errorString += i18n("Buffer Overflow. ");
} else if (bufferSize > 0) {
m_buffersFill[m_currentWriteBuffer] += bufferSize;
if (m_buffersFill[m_currentWriteBuffer] == m_BufferSize) {
m_currentWriteBuffer = (m_currentWriteBuffer+1 < m_nBuffers) ? m_currentWriteBuffer + 1 : 0;
m_readLock--;
retval = true;
}
}
return retval;
}
void MultiBuffer::unlockAllWriteBuffers()
{
m_currentWriteBuffer = m_currentReadBuffer;
// there are at maximum m_nBuffers - 1 full buffers. The nth buffer is the current read buffer
m_readLock -= m_nBuffers - 1 - m_readLock.available();
}
char *MultiBuffer::wait4ReadBuffer(size_t &buffer_fill)
{
m_buffersFill[m_currentReadBuffer] = 0; // mark buffer as empty again
m_readLock++;
m_currentReadBuffer = (m_currentReadBuffer+1 < m_nBuffers) ? m_currentReadBuffer + 1 : 0;
buffer_fill = m_buffersFill[m_currentReadBuffer];
return m_buffers[m_currentReadBuffer];
}
char *MultiBuffer::getCurrentReadBuffer(size_t &buffer_fill) const
{
buffer_fill = m_buffersFill[m_currentReadBuffer];
return m_buffers[m_currentReadBuffer];
}
void MultiBuffer::resetError()
{
m_error = false;
m_errorString = QString::null;
}
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