260 lines
7.2 KiB
C++
260 lines
7.2 KiB
C++
/*
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* ebusd - daemon for communication with eBUS heating systems.
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* Copyright (C) 2014-2016 John Baier <ebusd@ebusd.eu>
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "symbol.h"
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#include <iostream>
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#include <iomanip>
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#include <string>
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#include <vector>
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#include "result.h"
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using namespace std;
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/**
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* 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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void SymbolString::addAll(const SymbolString& str, bool skipLastSymbol) {
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bool addCrc = m_unescapeState == 0;
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bool isEscaped = str.m_unescapeState == 0;
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vector<unsigned char> data = str.m_data;
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size_t end = data.size();
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if (end > 0 && skipLastSymbol) {
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end--;
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}
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for (size_t i = 0; i < end; i++) {
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push_back(data[i], isEscaped, addCrc);
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}
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if (addCrc) {
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push_back(m_crc, false, false); // add CRC
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}
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}
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result_t SymbolString::parseHex(const string& str, const bool isEscaped) {
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bool addCrc = m_unescapeState == 0;
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for (size_t i = 0; i < str.size(); i += 2) {
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char* strEnd = NULL;
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const char* strBegin = str.substr(i, 2).c_str();
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unsigned long int value = strtoul(strBegin, &strEnd, 16);
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if (strEnd == NULL || strEnd != strBegin+2 || value > 0xff) {
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return RESULT_ERR_INVALID_NUM; // invalid value
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}
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push_back((unsigned char)value, isEscaped, addCrc);
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}
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if (addCrc) {
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push_back(m_crc, false, false); // add CRC
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}
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return RESULT_OK;
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}
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const string SymbolString::getDataStr(const bool unescape, const bool skipLastSymbol) {
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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 && previousEscape) {
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if (!skipLastSymbol || i+1 < m_data.size()) {
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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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}
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}
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previousEscape = false;
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} else if (m_unescapeState == 0 && unescape && value == ESC) {
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previousEscape = true; // escape sequence not yet finished
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} else if (!skipLastSymbol || i+1 < m_data.size()) {
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sstr << nouppercase << setw(2) << hex
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<< 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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result_t SymbolString::push_back(const unsigned char value, const bool isEscaped, const bool updateCRC) {
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if (m_unescapeState == 0) { // store escaped data
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if (!isEscaped && 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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} else if (!isEscaped && 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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} 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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}
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return RESULT_OK;
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}
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if (!isEscaped) {
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if (m_unescapeState != 1) {
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return RESULT_ERR_ESC; // invalid unescape state
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}
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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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} else if (value == SYN) {
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addCRC(ESC);
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addCRC(0x01);
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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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if (m_unescapeState != 1) {
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if (updateCRC) {
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addCRC(value);
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}
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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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if (value == ESC) {
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if (updateCRC) {
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addCRC(value);
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}
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m_unescapeState = 2;
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return RESULT_CONTINUE;
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}
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if (updateCRC) {
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addCRC(value);
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}
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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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/**
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* Return the index of the upper or lower 4 bits of a master address.
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* @param bits the upper or lower 4 bits of the address.
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* @return the 1-based index of the upper or lower 4 bits of a master address (1 to 5), or 0.
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*/
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unsigned char getMasterPartIndex(unsigned char bits) {
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switch (bits)
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{
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case 0x0:
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return 1;
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case 0x1:
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return 2;
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case 0x3:
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return 3;
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case 0x7:
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return 4;
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case 0xF:
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return 5;
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default:
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return 0;
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}
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}
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bool isMaster(unsigned char addr) {
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return getMasterPartIndex(addr & 0x0F) > 0
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&& getMasterPartIndex((addr & 0xF0)>>4) > 0;
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}
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bool isSlaveMaster(unsigned char addr) {
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return isMaster((unsigned char)(addr+256-5));
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}
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unsigned char getSlaveAddress(unsigned char addr) {
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if (isMaster(addr)) {
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return (unsigned char)(addr+5);
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}
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if (isValidAddress(addr, false)) {
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return addr;
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}
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return SYN;
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}
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unsigned char getMasterAddress(unsigned char addr) {
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if (isMaster(addr)) {
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return addr;
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}
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addr = (unsigned char)(addr+256-5);
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if (isMaster(addr)) {
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return addr;
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}
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return SYN;
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}
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unsigned char getMasterNumber(unsigned char addr) {
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unsigned char priority = getMasterPartIndex(addr & 0x0F);
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if (priority == 0) {
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return 0;
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}
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unsigned char index = getMasterPartIndex((addr & 0xF0) >> 4);
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if (index == 0) {
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return 0;
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}
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return (unsigned char)(5*(priority-1) + index);
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}
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bool isValidAddress(unsigned char addr, bool allowBroadcast) {
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return addr != SYN && addr != ESC && (allowBroadcast || addr != BROADCAST);
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}
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