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138 lines
2.7 KiB
138 lines
2.7 KiB
/*
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* Copyright (C) 2011,2013,2014 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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#include "OutputQueue.h"
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#include <cassert>
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COutputQueue::COutputQueue(unsigned int space, unsigned int threshold) :
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m_data(space),
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m_threshold(threshold),
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m_header(nullptr),
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m_count(0U)
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{
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assert(space > 0U);
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assert(threshold > 0U);
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}
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COutputQueue::~COutputQueue()
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{
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delete m_header;
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}
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void COutputQueue::setHeader(CHeaderData* header)
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{
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assert(header != nullptr);
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delete m_header;
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m_header = header;
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}
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CHeaderData* COutputQueue::getHeader()
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{
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CHeaderData* header = m_header;
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m_header = nullptr;
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return header;
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}
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unsigned int COutputQueue::getData(unsigned char *data, unsigned int length, bool& end)
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{
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assert(data != nullptr);
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if (m_data.isEmpty()) {
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end = false;
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return 0U;
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}
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unsigned char hdr[2U];
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m_data.getData(hdr, 2U);
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end = hdr[0U] == 1U;
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if (length < hdr[1U]) {
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unsigned int len = m_data.getData(data, length);
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// Purge the excess data
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unsigned int n = hdr[1U] - length;
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unsigned char c;
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for (unsigned int i = 0U; i < n; i++)
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m_data.getData(&c, 1U);
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return len;
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} else {
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return m_data.getData(data, hdr[1U]);
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}
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}
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unsigned int COutputQueue::addData(const unsigned char *data, unsigned int length, bool end)
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{
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assert(data != nullptr);
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bool ret = m_data.hasSpace(length + 2U);
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if (!ret) {
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return 0U;
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}
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unsigned char hdr[2U];
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hdr[0U] = end ? 1U : 0U;
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hdr[1U] = length;
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m_data.addData(hdr, 2U);
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if (end)
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m_count = m_threshold;
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else
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m_count++;
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return m_data.addData(data, length);
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}
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bool COutputQueue::headerReady() const
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{
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return m_header != nullptr && m_count >= m_threshold;
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}
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bool COutputQueue::dataReady() const
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{
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return m_header == nullptr && m_count >= m_threshold;
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}
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bool COutputQueue::isEmpty()
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{
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return m_header == nullptr && m_data.isEmpty();
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}
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void COutputQueue::reset()
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{
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m_data.clear();
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delete m_header;
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m_header = nullptr;
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m_count = 0U;
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}
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void COutputQueue::setThreshold(unsigned int threshold)
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{
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assert(threshold > 0U);
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m_threshold = threshold;
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}
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