159 lines
3.8 KiB
C++
159 lines
3.8 KiB
C++
/*
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* Copyright (C) 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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#include "DStarSlowData.h"
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#include "DStarDefines.h"
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#include "CRC.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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CDStarSlowData::CDStarSlowData() :
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m_header(NULL),
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m_ptr(0U),
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m_buffer(NULL),
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m_text(NULL),
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m_textPtr(0U),
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m_state(SDD_FIRST)
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{
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m_header = new unsigned char[50U]; // DSTAR_HEADER_LENGTH_BYTES
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m_buffer = new unsigned char[DSTAR_DATA_FRAME_LENGTH_BYTES * 2U];
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m_text = new unsigned char[24U];
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}
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CDStarSlowData::~CDStarSlowData()
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{
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delete[] m_header;
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delete[] m_buffer;
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delete[] m_text;
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}
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CDStarHeader* CDStarSlowData::add(const unsigned char* data)
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{
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assert(data != NULL);
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switch (m_state) {
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case SDD_FIRST:
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m_buffer[0U] = data[9U] ^ DSTAR_SCRAMBLER_BYTES[0U];
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m_buffer[1U] = data[10U] ^ DSTAR_SCRAMBLER_BYTES[1U];
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m_buffer[2U] = data[11U] ^ DSTAR_SCRAMBLER_BYTES[2U];
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m_state = SDD_SECOND;
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return NULL;
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case SDD_SECOND:
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m_buffer[3U] = data[9U] ^ DSTAR_SCRAMBLER_BYTES[0U];
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m_buffer[4U] = data[10U] ^ DSTAR_SCRAMBLER_BYTES[1U];
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m_buffer[5U] = data[11U] ^ DSTAR_SCRAMBLER_BYTES[2U];
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m_state = SDD_FIRST;
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break;
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}
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if ((m_buffer[0U] & DSTAR_SLOW_DATA_TYPE_MASK) != DSTAR_SLOW_DATA_TYPE_HEADER)
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return NULL;
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if (m_ptr >= 45U)
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return NULL;
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::memcpy(m_header + m_ptr, m_buffer + 1U, 5U);
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m_ptr += 5U;
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// Clean up the data
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m_header[0U] &= (DSTAR_INTERRUPTED_MASK | DSTAR_URGENT_MASK | DSTAR_REPEATER_MASK);
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m_header[1U] = 0x00U;
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m_header[2U] = 0x00U;
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for (unsigned int i = 3U; i < 39U; i++)
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m_header[i] &= 0x7FU;
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// Check the CRC
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bool ret = CCRC::checkCCITT161(m_header, DSTAR_HEADER_LENGTH_BYTES);
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if (!ret) {
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if (m_ptr == 45U)
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LogMessage("D-Star, invalid slow data header");
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return NULL;
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}
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return new CDStarHeader(m_header);
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}
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void CDStarSlowData::start()
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{
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::memset(m_header, 0x00U, DSTAR_HEADER_LENGTH_BYTES);
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m_ptr = 0U;
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m_state = SDD_FIRST;
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}
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void CDStarSlowData::reset()
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{
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m_ptr = 0U;
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m_state = SDD_FIRST;
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}
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void CDStarSlowData::setText(const char* text)
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{
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assert(text != NULL);
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m_text[0U] = DSTAR_SLOW_DATA_TYPE_TEXT | 0U;
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m_text[1U] = text[0U];
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m_text[2U] = text[1U];
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m_text[3U] = text[2U];
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m_text[4U] = text[3U];
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m_text[5U] = text[4U];
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m_text[6U] = DSTAR_SLOW_DATA_TYPE_TEXT | 1U;
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m_text[7U] = text[5U];
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m_text[8U] = text[6U];
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m_text[9U] = text[7U];
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m_text[10U] = text[8U];
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m_text[11U] = text[9U];
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m_text[12U] = DSTAR_SLOW_DATA_TYPE_TEXT | 2U;
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m_text[13U] = text[10U];
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m_text[14U] = text[11U];
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m_text[15U] = text[12U];
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m_text[16U] = text[13U];
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m_text[17U] = text[14U];
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m_text[18U] = DSTAR_SLOW_DATA_TYPE_TEXT | 3U;
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m_text[19U] = text[15U];
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m_text[20U] = text[16U];
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m_text[21U] = text[17U];
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m_text[22U] = text[18U];
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m_text[23U] = text[19U];
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m_textPtr = 0U;
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}
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void CDStarSlowData::get(unsigned char* data)
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{
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assert(data != NULL);
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if (m_textPtr < 24U) {
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data[0U] = m_text[m_textPtr++] ^ DSTAR_SCRAMBLER_BYTES[0U];
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data[1U] = m_text[m_textPtr++] ^ DSTAR_SCRAMBLER_BYTES[1U];
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data[2U] = m_text[m_textPtr++] ^ DSTAR_SCRAMBLER_BYTES[2U];
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} else {
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data[0U] = 'f' ^ DSTAR_SCRAMBLER_BYTES[0U];
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data[1U] = 'f' ^ DSTAR_SCRAMBLER_BYTES[1U];
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data[2U] = 'f' ^ DSTAR_SCRAMBLER_BYTES[2U];
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}
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}
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