file struturce changed.
This commit is contained in:
Roland Jax
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/*
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* Copyright (C) John Baier 2014 <ebusd@johnm.de>
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*
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* This file is part of ebusd.
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*
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* ebusd 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 3 of the License, or
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* (at your option) any later version.
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*
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* ebusd 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 ebusd. If not, see http://www.gnu.org/licenses/.
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*/
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#include "symbol.h"
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#include "result.h"
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#include <iostream>
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#include <iomanip>
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namespace libebus
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{
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/**
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* @brief CRC8 lookup table for the polynom 0x9b = x^8 + x^7 + x^4 + x^3 + x^1 + 1.
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*/
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static const unsigned char CRC_LOOKUP_TABLE[] =
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{
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0x00, 0x9b, 0xad, 0x36, 0xc1, 0x5a, 0x6c, 0xf7, 0x19, 0x82, 0xb4, 0x2f, 0xd8, 0x43, 0x75, 0xee,
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0x32, 0xa9, 0x9f, 0x04, 0xf3, 0x68, 0x5e, 0xc5, 0x2b, 0xb0, 0x86, 0x1d, 0xea, 0x71, 0x47, 0xdc,
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0x64, 0xff, 0xc9, 0x52, 0xa5, 0x3e, 0x08, 0x93, 0x7d, 0xe6, 0xd0, 0x4b, 0xbc, 0x27, 0x11, 0x8a,
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0x56, 0xcd, 0xfb, 0x60, 0x97, 0x0c, 0x3a, 0xa1, 0x4f, 0xd4, 0xe2, 0x79, 0x8e, 0x15, 0x23, 0xb8,
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0xc8, 0x53, 0x65, 0xfe, 0x09, 0x92, 0xa4, 0x3f, 0xd1, 0x4a, 0x7c, 0xe7, 0x10, 0x8b, 0xbd, 0x26,
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0xfa, 0x61, 0x57, 0xcc, 0x3b, 0xa0, 0x96, 0x0d, 0xe3, 0x78, 0x4e, 0xd5, 0x22, 0xb9, 0x8f, 0x14,
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0xac, 0x37, 0x01, 0x9a, 0x6d, 0xf6, 0xc0, 0x5b, 0xb5, 0x2e, 0x18, 0x83, 0x74, 0xef, 0xd9, 0x42,
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0x9e, 0x05, 0x33, 0xa8, 0x5f, 0xc4, 0xf2, 0x69, 0x87, 0x1c, 0x2a, 0xb1, 0x46, 0xdd, 0xeb, 0x70,
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0x0b, 0x90, 0xa6, 0x3d, 0xca, 0x51, 0x67, 0xfc, 0x12, 0x89, 0xbf, 0x24, 0xd3, 0x48, 0x7e, 0xe5,
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0x39, 0xa2, 0x94, 0x0f, 0xf8, 0x63, 0x55, 0xce, 0x20, 0xbb, 0x8d, 0x16, 0xe1, 0x7a, 0x4c, 0xd7,
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0x6f, 0xf4, 0xc2, 0x59, 0xae, 0x35, 0x03, 0x98, 0x76, 0xed, 0xdb, 0x40, 0xb7, 0x2c, 0x1a, 0x81,
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0x5d, 0xc6, 0xf0, 0x6b, 0x9c, 0x07, 0x31, 0xaa, 0x44, 0xdf, 0xe9, 0x72, 0x85, 0x1e, 0x28, 0xb3,
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0xc3, 0x58, 0x6e, 0xf5, 0x02, 0x99, 0xaf, 0x34, 0xda, 0x41, 0x77, 0xec, 0x1b, 0x80, 0xb6, 0x2d,
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0xf1, 0x6a, 0x5c, 0xc7, 0x30, 0xab, 0x9d, 0x06, 0xe8, 0x73, 0x45, 0xde, 0x29, 0xb2, 0x84, 0x1f,
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0xa7, 0x3c, 0x0a, 0x91, 0x66, 0xfd, 0xcb, 0x50, 0xbe, 0x25, 0x13, 0x88, 0x7f, 0xe4, 0xd2, 0x49,
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0x95, 0x0e, 0x38, 0xa3, 0x54, 0xcf, 0xf9, 0x62, 0x8c, 0x17, 0x21, 0xba, 0x4d, 0xd6, 0xe0, 0x7b,
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};
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SymbolString::SymbolString(const std::string str)
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: m_unescapeState(0), m_crc(0)
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{
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// parse + escape
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for (size_t i = 0; i+1 < str.size(); i += 2) {
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unsigned long value = strtoul(str.substr(i, 2).c_str(), NULL, 16); // TODO check
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push_back((unsigned char)value, false, true);
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}
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// add CRC + escape
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push_back(m_crc, false, false);
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}
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SymbolString::SymbolString(const std::string str, bool isEscaped)
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: m_unescapeState(1), m_crc(0)
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{
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// parse + optionally unescape
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for (size_t i = 0; i+1 < str.size(); i += 2) {
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unsigned long value = strtoul(str.substr(i, 2).c_str(), NULL, 16); // TODO check
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push_back((unsigned char)value, isEscaped, false);
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}
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}
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const std::string SymbolString::getDataStr(const bool unescape)
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{
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std::stringstream sstr;
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bool previousEscape = false;
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for (size_t i = 0; i < m_data.size(); i++) {
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unsigned char value = m_data[i];
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if (m_unescapeState == 0 && unescape == true && previousEscape == true) {
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if (value == 0x00)
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sstr << "a9"; // ESC
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else if (value == 0x01)
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sstr << "aa"; // SYN
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else
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sstr << "XX"; // invalid escape sequence
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previousEscape = false;
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}
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else if (m_unescapeState == 0 && unescape == true && value == ESC) {
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previousEscape = true; // escape sequence not yet finished
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}
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else {
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sstr << std::nouppercase << std::setw(2) << std::hex
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<< std::setfill('0') << static_cast<unsigned>(value);
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}
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}
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return sstr.str();
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}
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int SymbolString::push_back(const unsigned char value, const bool isEscaped, const bool updateCRC)
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{
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if (m_unescapeState == 0) { // store escaped data
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if (isEscaped == false && value == ESC) {
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m_data.push_back(ESC);
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m_data.push_back(0x00);
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if (updateCRC) {
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addCRC(ESC);
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addCRC(0x00);
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}
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}
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else if (isEscaped == false && value == SYN) {
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m_data.push_back(ESC);
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m_data.push_back(0x01);
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if (updateCRC) {
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addCRC(ESC);
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addCRC(0x01);
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}
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}
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else {
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m_data.push_back(value);
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if (updateCRC)
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addCRC(value);
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}
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return RESULT_OK;
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}
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else if (isEscaped == false) {
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if (m_unescapeState != 1)
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return RESULT_ERR_ESC; // invalid unescape state
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m_data.push_back(value);
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if (updateCRC) {
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if (value == ESC) {
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addCRC(ESC);
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addCRC(0x00);
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}
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else if (value == SYN) {
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addCRC(ESC);
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addCRC(0x01);
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}
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else {
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addCRC(value);
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}
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}
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return RESULT_OK;
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}
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else if (m_unescapeState != 1) {
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if (updateCRC)
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addCRC(value);
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if (value == 0x00) {
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m_data.push_back(ESC);
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m_unescapeState = 1;
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return RESULT_OK;
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}
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if (value == 0x01) {
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m_data.push_back(SYN);
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m_unescapeState = 1;
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return RESULT_OK;
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}
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return RESULT_ERR_ESC; // invalid escape sequence
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}
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else if (value == ESC) {
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if (updateCRC)
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addCRC(value);
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m_unescapeState = 2;
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return RESULT_IN_ESC;
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}
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if (updateCRC)
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addCRC(value);
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m_data.push_back(value);
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return RESULT_OK;
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}
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void SymbolString::addCRC(const unsigned char value) {
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m_crc = CRC_LOOKUP_TABLE[m_crc]^value;
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}
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bool isMaster(unsigned char addr) {
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unsigned char addrHi = (addr & 0xF0) >> 4;
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unsigned char addrLo = (addr & 0x0F);
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return ((addrHi == 0x0) || (addrHi == 0x1) || (addrHi == 0x3) || (addrHi == 0x7) || (addrHi == 0xF))
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&& ((addrLo == 0x0) || (addrLo == 0x1) || (addrLo == 0x3) || (addrLo == 0x7) || (addrLo == 0xF));
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}
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} //namespace
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