Merge branch 'john30-master'

.gitignore

@@ -22,3 +22,4 @@ Makefile.in
 /src/test/test_decode
 /src/test/test_encode
 /src/test/test_symbol
+/src/test/test_data

src/ebusd/ebusloop.cpp

@@ -114,7 +114,7 @@ void* EBusLoop::run()
 			// add new bus command to send
 			if (busResult == RESULT_SYN && busCommandActive == false && m_sendBuffer.size() != 0) {
 				BusCommand* busCommand = m_sendBuffer.remove();
-				L.log(bus, debug, " msg: %s", busCommand->getCommand().getDataStr(true).c_str());
+				L.log(bus, debug, " msg: %s", busCommand->getCommand().getDataStr().c_str());
 				m_bus->addCommand(busCommand);
 				L.log(bus, debug, " addCommand success");
 				busCommandActive = true;

src/libebus/Makefile.am

@@ -8,6 +8,8 @@ libebus_a_SOURCES = result.cpp \
 		    result.h \
 		    symbol.cpp \
 		    symbol.h \
+		    data.cpp \
+		    data.h \
 		    port.cpp \
 		    port.h \
 		    buscommand.cpp \

src/libebus/bus.cpp

@@ -27,7 +27,7 @@ namespace libebus
 
 Bus::Bus(const std::string deviceName, const bool noDeviceCheck, const long recvTimeout,
 	const std::string dumpFile, const long dumpSize, const bool dumpState)
-	: m_previousEscape(false), m_recvTimeout(recvTimeout), m_dumpState(dumpState),
+	: m_sstr(), m_recvTimeout(recvTimeout), m_dumpState(dumpState),
 	  m_busLocked(false), m_busPriorRetry(false)
 {
 	m_port = new Port(deviceName, noDeviceCheck);
@@ -91,14 +91,13 @@ int Bus::proceed()
 int Bus::proceedCycData(const unsigned char byte)
 {
 	if (byte != SYN) {
-		m_sstr.push_back_unescape(byte, m_previousEscape, false);
+		m_sstr.push_back(byte, true, false);
 		if (m_busLocked == true)
 			m_busLocked = false;
 
 		return RESULT_DATA;
 	}
 
-	m_previousEscape = false;
 	if (byte == SYN && m_sstr.size() != 0) {
 		// lock bus after SYN-BYTE-SYN Sequence
 		if (m_sstr.size() == 1 && m_busPriorRetry == false)
@@ -265,7 +264,7 @@ BusCommand* Bus::sendCommand()
 			goto on_exit;
 
 		// receive NN, Dx, CRC
-		slaveData = SymbolString();
+		slaveData.clear();
 		retval = recvSlaveDataAndCRC(slaveData);
 
 		// are calculated and received CRC equal?
@@ -346,76 +345,39 @@ unsigned char Bus::recvByte()
 
 int Bus::recvSlaveDataAndCRC(SymbolString& result)
 {
-	unsigned char byte_recv;
+	unsigned char byte_recv, crc_calc = 0;
 	ssize_t bytes_recv;
-	bool previousEscape = false;
+	size_t NN = 0;
+	bool updateCrc = true;
+	int retval = 0;
 
-	// receive NN
-	bytes_recv = m_port->recv(RECV_TIMEOUT, 1);
-	if (bytes_recv < 0)
-		return RESULT_ERR_TIMEOUT;
-
-	byte_recv = recvByte();
-	byte_recv = result.push_back_unescape(byte_recv, previousEscape);
-	if (previousEscape == true && byte_recv == 0)
-		return RESULT_ERR_ESC;
-
-	// escape sequence: get another symbol to find NN
-	if (previousEscape == true) {
+	for (size_t i = 0, needed = 1; i < needed; i++) {
 		bytes_recv = m_port->recv(RECV_TIMEOUT, 1);
 		if (bytes_recv < 0)
 			return RESULT_ERR_TIMEOUT;
 
 		byte_recv = recvByte();
-		byte_recv = result.push_back_unescape(byte_recv, previousEscape);
-		if (previousEscape == true)
-			return RESULT_ERR_ESC;
+		retval = result.push_back(byte_recv, true, updateCrc);
+		if (retval < 0)
+			return retval;
+
+		if (retval == RESULT_IN_ESC)
+			needed++;
+		else if (result.size() == 1) { // NN received
+			NN = result[0];
+			needed += NN;
+		}
+		else if (NN > 0 && result.size() == 1+NN) {// all data received
+			updateCrc = false;
+			crc_calc = result.getCRC();
+			needed++;
+		}
 	}
 
-	int NN = byte_recv;
-
-	// receive Dx
-	for (int i = 0; i < NN; i++) {
-		bytes_recv = m_port->recv(RECV_TIMEOUT, 1);
-		if (bytes_recv < 0)
-			return RESULT_ERR_TIMEOUT;
-
-		byte_recv = recvByte();
-		byte_recv = result.push_back_unescape(byte_recv, previousEscape);
-		if (previousEscape == true && byte_recv == 0)
-			return RESULT_ERR_ESC;
-
-		// escape sequence: increase NN
-		if (previousEscape == true)
-			NN++;
-	}
-	if (previousEscape == true)
+	if (retval == RESULT_IN_ESC)
 		return RESULT_ERR_ESC;
 
-	unsigned char crc_calc = result.getCRC();
-	// receive CRC
-	bytes_recv = m_port->recv(RECV_TIMEOUT, 1);
-	if (bytes_recv < 0)
-		return RESULT_ERR_TIMEOUT;
-
-	byte_recv = recvByte();
-	byte_recv = result.push_back_unescape(byte_recv, previousEscape, false);
-	if (previousEscape == true && byte_recv == 0)
-		return RESULT_ERR_ESC;
-
-	// escape sequence: get another symbol to find CRC
-	if (previousEscape == true) {
-		bytes_recv = m_port->recv(RECV_TIMEOUT, 1);
-		if (bytes_recv < 0)
-			return RESULT_ERR_TIMEOUT;
-
-		byte_recv = recvByte();
-		byte_recv = result.push_back_unescape(byte_recv, previousEscape);
-		if (previousEscape == true)
-			return RESULT_ERR_ESC;
-	}
-
-	if (crc_calc != byte_recv)
+	if (updateCrc || crc_calc != result[result.size()-1])
 		return RESULT_ERR_CRC;
 
 	return RESULT_OK;

src/libebus/bus.h

@@ -64,7 +64,6 @@ public:
 
 private:
 	Port* m_port;
-	bool m_previousEscape;
 	SymbolString m_sstr;
 	std::queue<SymbolString> m_cycBuffer;
 	std::queue<BusCommand*> m_sendBuffer;

src/libebus/buscommand.cpp

@@ -22,9 +22,8 @@
 namespace libebus
 {
 
-
-BusCommand::BusCommand(const std::string command, const bool isPoll)
-	: m_isPoll(isPoll), m_command(command), m_resultCode(RESULT_OK)
+BusCommand::BusCommand(const std::string commandStr, const bool isPoll)
+	: m_isPoll(isPoll), m_command(commandStr), m_result(), m_resultCode(RESULT_OK)
 {
 	unsigned char dstAddress = m_command[1];
 
@@ -51,16 +50,16 @@ const std::string BusCommand::getMessageStr()
 
 	if (m_resultCode >= 0) {
 		if (m_type == masterSlave) {
-			result = m_command.getDataStr(true);
+			result = m_command.getDataStr();
 			result += "00";
 			result += m_result.getDataStr();
 			result += "00";
 		} else {
 			result = "success";
 		}
-	} else {
-		result = "error";
 	}
+	else
+		result = "error: "+std::string(getResultCodeCStr());
 
 	return result;
 }

src/libebus/data.cpp

@@ -0,0 +1,599 @@
+/*
+ * Copyright (C) John Baier 2014 <ebusd@johnm.de>
+ *
+ * This file is part of ebusd.
+ *
+ * ebusd 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ebusd is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ebusd. If not, see http://www.gnu.org/licenses/.
+ */
+
+#include "data.h"
+#include "decode.h"
+#include "encode.h"
+#include <iostream>
+#include <algorithm>
+#include <sstream>
+#include <iomanip>
+#include <vector>
+#include <cstring>
+
+namespace libebus
+{
+
+/** the known data field types. */
+static const dataType_t dataTypes[] = {
+	{"STR",16, bt_str,   ADJ,' ',           1,         16,     0}, // >= 1 byte character string filled up with space
+	{"HEX",16, bt_hexstr,ADJ,  0,           2,         47,     0}, // >= 1 byte hex digit string, usually separated by space, e.g. 0a 1b 2c 3d
+	{"BDA", 4, bt_date,  BCD,  0,          10,         10,     0}, // date in BCD, 01.01.2000 - 31.12.2099 (0x01,0x01,WW,0x00 - 0x31,0x12,WW,0x99, WW is ignored weekday)
+	{"BDA", 3, bt_date,  BCD,  0,          10,         10,     0}, // date in BCD, 01.01.2000 - 31.12.2099 (0x01,0x01,0x00 - 0x31,0x12,0x99)
+	{"HDA", 4, bt_date,    0,  0,          10,         10,     0}, // date, 01.01.2000 - 31.12.2099 (0x01,0x01,WW,0x00 - 0x31,0x12,WW,0x99, WW is ignored weekday) // TODO remove duplicate of BDA
+	{"HDA", 3, bt_date,    0,  0,          10,         10,     0}, // date, 01.01.2000 - 31.12.2099 (0x01,0x01,0x00 - 0x31,0x12,0x99) // TODO remove duplicate of BDA
+	{"BTI", 3, bt_time,BCD|REV,0,           8,          8,     0}, // time in BCD, 00:00:00 - 23:59:59 (0x00,0x00,0x00 - 0x59,0x59,0x23)
+	{"TTM", 1, bt_time,    0,  0,           5,          5,     0}, // truncated time (only multiple of 10 minutes), 00:00 - 24:00 (minutes div 10 + hour * 6 as integer)
+	{"BDY", 1, bt_list,BCD|DAY,0,           0,          6,     0}, // weekday, "Mon" - "Sun"
+	{"HDY", 1, bt_list,BCD|DAY,0,           1,          7,     0}, // weekday, "Mon" - "Sun"
+	{"BCD", 1, bt_number,BCD|LST,0xff,      0,       0x99,     1}, // unsigned decimal in BCD, 0 - 99
+	{"UCH", 1, bt_number, LST, 0xff,        0,       0xff,     1}, // unsigned integer, 0 - 255
+	{"SCH", 1, bt_number, SIG, 0x80,     0x80,       0x7f,     1}, // signed integer, -128 - +127
+	{"D1B", 1, bt_number, SIG, 0x80,     0x81,       0x7f,     1}, // signed integer, -127 - +127
+	{"D1C", 1, bt_number,   0, 0xff,     0x00,       0xc8,     2}, // unsigned number (fraction 1/2), 0 - 100 (0x00 - 0xc8, replacement 0xff)
+	{"UIN", 2, bt_number, LST, 0xffff,      0,     0xffff,     1}, // unsigned integer, 0 - 65535
+	{"SIN", 2, bt_number, SIG, 0x8000, 0x8000,     0x7fff,     1}, // signed integer, -32768 - +32767
+	{"FLT", 2, bt_number, SIG, 0x8000, 0x8000,     0x7fff,  1000}, // signed number (fraction 1/1000), -32.768 - +32.767
+	{"D2B", 2, bt_number, SIG, 0x8000, 0x8001,     0x7fff,   256}, // signed number (fraction 1/256), -127.99 - +127.99
+	{"D2C", 2, bt_number, SIG, 0x8000, 0x8001,     0x7fff,    16}, // signed number (fraction 1/16), -2047.9 - +2047.9
+	{"ULG", 4, bt_number, LST, 0xffffffff,          0, 0xffffffff, 1}, // unsigned integer, 0 - 4294967295
+	{"SLG", 4, bt_number, SIG, 0x80000000, 0x80000000, 0xffffffff, 1}, // signed integer, -2147483648 - +2147483647
+}; // TODO check value range for numberdf
+
+/** the week day names. */
+static const char* dayNames[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
+
+
+DataField* DataField::create(const unsigned char dstAddress, const bool isSetMessage,
+		std::vector<std::string>::iterator& it, const std::vector<std::string>::iterator end) {
+	std::string name, unit, comment;
+	PartType partType;
+	float factor;
+	size_t baseOffset = 0, offset = 0, length = 0, maxPos = 16, offsetCnt = 0;
+
+	if (it == end)
+		return NULL;
+	name = *it++;
+	if (it == end || name.size() == 0)
+		return NULL;
+	const char* posStr = (*it++).c_str();
+	if (it == end)
+		return NULL;
+	if (dstAddress == BROADCAST
+	|| isMaster(dstAddress)
+	|| (isSetMessage == true && posStr[0] <= '9')
+	|| posStr[0] == 'm') { // master data
+		partType = pt_masterData;
+		baseOffset = 5; // skip QQ ZZ PB SB NN
+		//len = command.getMasterDataLength();
+		if (posStr[0] == 'm')
+			posStr++;
+	} else if ((isSetMessage == false && posStr[0] <= '9')
+	|| posStr[0] == 's') { // slave data
+		baseOffset = 1;
+		//offset = 5+command.getMasterDataLength()+3; // skip QQ ZZ PB SB NN Dx CRC ACK NN
+		//len = command.getSlaveDataLength();
+		if (posStr[0] == 's')
+			posStr++;
+	} else {
+		return NULL; // TODO error code: invalid pos definition
+	}
+	std::string token;
+	std::istringstream stream(posStr);
+	while (std::getline(stream, token, '-') != 0) {
+		if (++offsetCnt > 2)
+			return NULL; // TODO error code: invalid pos definition
+		const char* start = token.c_str();
+		char* end = NULL;
+		unsigned int pos = strtoul(start, &end, 10)-1; // 1-based
+		if (end != start+strlen(start))
+			return NULL; // TODO error code: invalid pos definition
+		if (baseOffset+pos > maxPos)
+			return NULL; // TODO error code: invalid pos definition
+		else if (offsetCnt==1)
+			offset = baseOffset+pos;
+		else if (baseOffset+pos >= offset)
+			length = baseOffset+pos+1-offset;
+		else { // wrong order e.g. 4-3
+			length = offset-(baseOffset+pos+1);
+			offset = baseOffset+pos;
+		}
+	}
+
+	const char* typeStr = (*it++).c_str();
+
+	std::map<unsigned int, std::string> values;
+	if (it == end)
+		factor = 1.0;
+	else {
+		std::string factorStr = *it++;
+		if (factorStr.empty())
+			factor = 1.0;
+		else if (factorStr.find_first_not_of("0123456789.") == std::string::npos)
+			factor = static_cast<float>(strtod(factorStr.c_str(), NULL));
+		else {
+			factor = 1.0;
+			std::istringstream stream(factorStr);
+			while (std::getline(stream, token, ',') != 0) {
+				const char* start = token.c_str();
+				char* end = NULL;
+				unsigned int id = strtoul(start, &end, 10);
+				if (end == NULL || end == start || *end != '=')
+					return NULL; // TODO error code: invalid values definition
+				values[id] = std::string(end+1);
+			}
+		}
+	}
+
+	if (it == end)
+		unit = "";
+	else {
+		unit = *it++;
+
+		if (unit.length() == 1 && unit[0] == '-')
+			unit.clear();
+	}
+
+	if (it == end)
+		comment = "";
+	else {
+		comment = *it++;
+		if (comment.length() == 1 && comment[0] == '-')
+			comment.clear();
+	}
+
+	for (size_t i = 0; i < sizeof(dataTypes)/sizeof(dataTypes[0]); i++) {
+		dataType_t dataType = dataTypes[i];
+		if (strcasecmp(typeStr, dataType.name) == 0) {
+			if ((dataType.flags&ADJ) != 0) {
+				if (length == 0)
+					length = 1; // minimum length defaults to 1
+				else if (length > dataType.numBytes)
+					return NULL; // invalid length
+			}
+			else if (length == 0)
+				length = dataType.numBytes;
+			else if (length != dataType.numBytes)
+				continue; // check for another one with same name but different length
+
+			switch (dataType.type) {
+			case bt_str:
+			case bt_hexstr:
+			case bt_date: // TODO better numeric?
+			case bt_time: // TODO better numeric?
+				return new StringDataField(name, partType, offset, length, dataType, unit, comment);
+			case bt_list:
+				if (values.empty() == false) {
+					if (values.begin()->first < dataType.minValueOrLength)
+						return NULL; // invalid value id
+					std::map<unsigned int, std::string>::iterator end = values.end();
+					end--;
+					if (end->first > dataType.maxValueOrLength)
+						return NULL; // invalid value id
+				}
+				else if ((dataType.flags&DAY) != 0) {
+					for (unsigned int i=0; i<sizeof(dayNames)/sizeof(dayNames[0]); i++)
+						values[dataType.minValueOrLength + i] = dayNames[i];
+				}
+				return new ValueListDataField(name, partType, offset, length, dataType, unit, comment, values);
+			case bt_number:
+				if (values.empty() || (dataType.flags&LST) == 0)
+					return new NumberDataField(name, partType, offset, length, dataType, unit, comment, factor);
+				return new ValueListDataField(name, partType, offset, length, dataType, unit, comment, values);
+			}
+		}
+	}
+	return NULL; // TODO error code: invalid type definition
+}
+
+const std::string DataField::read(SymbolString& masterData, SymbolString& slaveData, bool verbose)
+{
+	SymbolString& input = m_partType == pt_masterData ? masterData : slaveData;
+	switch (m_partType) {
+	case pt_masterData:
+		break;
+	case pt_slaveData:
+		break;
+	default:
+		return "invalid part type";
+	}
+	std::ostringstream output;
+	if (verbose)
+		output << m_name << "=";
+
+	if (readSymbols(input, output) == false)
+		return "unable to parse";
+
+	if (verbose && m_unit.length() > 0)
+		output << " " << m_unit;
+	if (verbose && m_comment.length() > 0)
+		output << " [" << m_comment << "]";
+	return output.str();
+}
+
+bool DataField::write(const std::string& value, SymbolString& masterData, SymbolString& slaveData)
+{
+	SymbolString& output = m_partType == pt_masterData ? masterData : slaveData;
+	switch (m_partType) {
+	case pt_masterData:
+	case pt_slaveData:
+		break;
+	default:
+		return false; // TODO error code
+	}
+	std::istringstream input(value);
+	if (writeSymbols(input, output) == false)
+		return false; // TODO error code
+	return true;
+}
+
+
+
+bool StringDataField::readSymbols(SymbolString& input, std::ostringstream& output)
+{
+	size_t start = m_offset, end = m_offset + m_length;
+	int incr = 1;
+	unsigned char ch;
+
+	if (end > input.size())
+		return false; // TODO error not enough data available
+
+	if ((m_dataType.flags&REV) != 0) { // reverted binary representation (most significant byte first)
+		end = start - 1;
+		start = m_offset + m_length - 1;
+		incr = -1;
+	}
+
+	for (size_t pos = start, i = 0; pos != end; pos += incr, i++) {
+		if (m_length == 4 && i == 2 && m_dataType.type == bt_date)
+			continue; // skip weekday in between
+		ch = input[pos];
+		if ((m_dataType.flags & BCD) != 0) {
+			if ((ch & 0xf0) > 0x90 || (ch & 0x0f) > 0x09)
+				return false; // invalid BCD
+			ch = (ch >> 4) * 10 + (ch & 0x0f);
+		}
+		switch (m_dataType.type) {
+		case bt_hexstr:
+			if (i > 0)
+				output << ' ';
+			output << std::nouppercase << std::setw(2) << std::hex
+			       << std::setfill('0') << static_cast<unsigned>(ch);
+			break;
+		case bt_date:
+			if (i + 1 == m_length)
+				output << (2000+ch);
+			else if (ch < 1 || (i == 0 && ch > 31) || (i == 1 && ch > 12))
+				return false; // invalid date
+			else
+				output << std::setw(2) << std::setfill('0') << static_cast<unsigned>(ch) << ".";
+			break;
+		case bt_time:
+			if (m_length == 1) { // truncated time
+				if (ch > 24*6)
+					return false; // invalid time
+				output << std::setw(2) << std::setfill('0') << static_cast<unsigned>(ch/6) << ":"
+				       << std::setw(2) << std::setfill('0') << static_cast<unsigned>((ch%6)*10);
+				break;
+			}
+			if (i > 0)
+				output << ":";
+			if ((i == 0 && ch > 23) || (i > 0 && ch > 59))
+				return false; // invalid time
+			output << std::setw(2) << std::setfill('0') << static_cast<unsigned>(ch);
+			break;
+		default:
+			if (ch < 0x20)
+				ch = m_dataType.replacement;
+			output << static_cast<char>(ch);
+			break;
+		}
+	}
+
+	return true;
+}
+
+bool StringDataField::writeSymbols(std::istringstream& input, SymbolString& output)
+{
+	size_t start = m_offset, end = m_offset + m_length;
+	int incr = 1;
+	const char* str;
+	char* strEnd;
+	unsigned long int value = 0, minutes = 0;
+	std::string token;
+
+	if ((m_dataType.flags&REV) != 0) { // reverted binary representation (most significant byte first)
+		end = start - 1;
+		start = m_offset + m_length - 1;
+		incr = -1;
+	}
+
+	for (size_t pos = start, i = 0; pos != end; pos += incr, i++) {
+		switch (m_dataType.type) {
+		case bt_hexstr:
+			while (input.peek()==' ')
+				input.get();
+			token.clear();
+			token.push_back(input.get());
+			if (input.eof() == true)
+				return false; // TODO error code: invalid value
+			token.push_back(input.get());
+			if (input.eof() == true)
+				return false; // TODO error code: invalid value
+
+			str = token.c_str();
+			strEnd = NULL;
+			value = strtoul(str, &strEnd, 16);
+			if (strEnd != str+strlen(str))
+				return false; // TODO error code: invalid value
+			break;
+		case bt_date:
+			if (m_length == 4 && i == 2)
+				continue; // skip weekday in between
+			if (std::getline(input, token, '.') == 0)
+				return false;
+			str = token.c_str();
+			strEnd = NULL;
+			value = strtoul(str, &strEnd, 10);
+			if (strEnd != str+strlen(str))
+				return false; // TODO error code: invalid value
+			if (i + 1 == m_length && value >= 2000)
+				value -= 2000;
+			else if (value < 1 || (i == 0 && value > 31) || (i == 1 && value > 12))
+				return false; // invalid date
+			break;
+		case bt_time:
+			if (std::getline(input, token, ':') == 0)
+				return false;
+			str = token.c_str();
+			strEnd = NULL;
+			value = strtoul(str, &strEnd, 10);
+			if (strEnd != str+strlen(str))
+				return false; // TODO error code: invalid value
+			if (m_length == 1) { // truncated time
+				if (std::getline(input, token, ':') == 0)
+					return false;
+				str = token.c_str();
+				strEnd = NULL;
+				minutes = strtoul(str, &strEnd, 10);
+				if (strEnd != str+strlen(str))
+					return false; // TODO error code: invalid value
+				if ((minutes % 10) != 0)
+					return false; // invalid time
+				value = value*6 + (minutes / 10);
+				if (value > 24*6)
+					return false; // invalid time
+				break;
+			}
+			if ((i == 0 && value > 23) || (i > 0 && value > 59))
+				return false; // invalid time
+			break;
+		default:
+			value = input.get();
+			if (input.eof() == true || value < 0x20)
+				value = m_dataType.replacement;
+			break;
+		}
+		if ((m_dataType.flags & BCD) != 0) {
+			if (value > 99)
+				return false; // invalid BCD
+			value = (value/10)<<4 | (value%10);
+		}
+		if (value > 0xff)
+			return false;
+		output[pos] = (unsigned char)value;
+	}
+
+	return true;
+}
+
+
+bool NumericDataField::readRawValue(SymbolString& input, unsigned int& value)
+{
+	size_t start = m_offset, end = m_offset + m_length;
+	int incr = 1;
+	unsigned char ch;
+
+	if (end > input.size())
+		return false; // TODO error not enough data available
+
+	if ((m_dataType.flags&REV) != 0) { // reverted binary representation (most significant byte first)
+		end = start - 1;
+		start = m_offset + m_length - 1;
+		incr = -1;
+	}
+
+	value = 0;
+	for (size_t pos = start, exp = 1; pos != end; pos += incr) {
+		ch = input[pos];
+		if ((m_dataType.flags & BCD) != 0) {
+			if (ch == m_dataType.replacement) {
+				value = m_dataType.replacement;
+				return true;
+			}
+			if ((ch & 0xf0) > 0x90 || (ch & 0x0f) > 0x09)
+				return false; // invalid BCD
+
+			ch = (ch >> 4) * 10 + (ch & 0x0f);
+			value += ch*exp;
+			exp = exp*100;
+		}
+		else {
+			value |= ch*exp;
+			exp = exp<<8;
+		}
+	}
+	return true;
+}
+
+bool NumericDataField::writeRawValue(unsigned int value, SymbolString& output)
+{
+	size_t start = m_offset, end = m_offset + m_length;
+	int incr = 1;
+	unsigned char ch;
+
+	if ((m_dataType.flags&REV) != 0) { // reverted binary representation (most significant byte first)
+		end = start - 1;
+		start = m_offset + m_length - 1;
+		incr = -1;
+	}
+
+	for (size_t pos = start, exp = 1; pos != end; pos += incr) {
+		if ((m_dataType.flags & BCD) != 0) {
+			if (value == m_dataType.replacement)
+				ch = m_dataType.replacement;
+			else {
+				ch = (value/exp)%100;
+				ch = ((ch/10)<<4) | (ch%10);
+			}
+			exp = exp*100;
+		}
+		else {
+			ch = (value/exp)&0xff;
+			exp = exp<<8;
+		}
+		output[pos] = ch;
+	}
+
+	return true;
+}
+
+
+bool NumberDataField::readSymbols(SymbolString& input, std::ostringstream& output)
+{
+	unsigned int value = 0;
+	int signedValue;
+
+	if (readRawValue(input, value) == false)
+		return false;
+
+	if (value == m_dataType.replacement) {
+		output << "-";
+		return true;
+	}
+
+	if ((m_dataType.flags&SIG) != 0 && (value & (1 << (m_dataType.numBytes*8 - 1))) != 0) // negative signed value
+		if (m_dataType.numBytes == 4)
+			signedValue = (int)value;
+		else
+			signedValue = (int)value - (1 << (m_dataType.numBytes*8));
+	else {
+		if (m_dataType.numBytes == 4) {
+			if (m_factor == 1.0)
+				output << static_cast<unsigned>(value);
+			else
+				output << std::setprecision(3) << std::fixed << static_cast<float>(value * m_factor);
+			return true;
+		}
+
+		signedValue = (int)value;
+	}
+
+	if (m_factor == 1.0)
+		output << static_cast<int>(signedValue);
+	else
+		output << std::setprecision(3) << std::fixed << static_cast<float>(signedValue * m_factor);
+
+	return true;
+}
+
+bool NumberDataField::writeSymbols(std::istringstream& input, SymbolString& output)
+{
+	unsigned int value;
+
+	const char* str = input.str().c_str();
+	if (strcasecmp(str, "-") == 0)
+		// replacement value
+		value = m_dataType.replacement;
+	else {
+		char* strEnd = NULL;
+		if (m_factor == 1.0) {
+			if ((m_dataType.flags&SIG) != 0) {
+				int signedValue = strtol(str, &strEnd, 10);
+				if (signedValue < 0 && m_dataType.numBytes != 4)
+					value = (unsigned int)(signedValue + (1<<(m_dataType.numBytes*8)));
+				else
+					value = (unsigned int)signedValue;
+			}
+			else
+				value = strtoul(str, &strEnd, 10);
+			if (strEnd != str+strlen(str))
+				return false; // TODO error code: invalid value
+		}
+		else {
+			char* strEnd = NULL;
+			double dvalue = strtod(str, &strEnd);
+			if (strEnd != str+strlen(str))
+				return false; // TODO error code: invalid value
+			dvalue = dvalue / m_factor + 0.5; // round
+			if ((m_dataType.flags&SIG) != 0) {
+				if (dvalue < -(1LL<<(8*m_length)) || dvalue >= (1LL<<(8*m_length)))
+					return false; // TODO error code: invalid value
+				if (dvalue < 0 && m_dataType.numBytes != 4)
+					value = (unsigned int)(dvalue + (1<<(m_dataType.numBytes*8)));
+				else
+					value = (unsigned int)dvalue;
+			}
+			else {
+				if (dvalue < 0.0 || dvalue >= (1LL<<(8*m_length)))
+					return false; // TODO error code: invalid value
+				value = (unsigned int)dvalue;
+			}
+		}
+	}
+
+	return writeRawValue(value, output);
+}
+
+
+bool ValueListDataField::readSymbols(SymbolString& input, std::ostringstream& output)
+{
+	unsigned int value = 0;
+
+	if (readRawValue(input, value) == false)
+		return false;
+
+	if (value == m_dataType.replacement) {
+		output << "-";
+		return true;
+	}
+
+	std::map<unsigned int, std::string>::iterator it = m_values.find(value);
+	if (it == m_values.end())
+		return false;
+
+	output << it->second;
+	return true;
+}
+
+bool ValueListDataField::writeSymbols(std::istringstream& input, SymbolString& output)
+{
+	std::string str;
+	input >> str;
+
+	for (std::map<unsigned int, std::string>::iterator it = m_values.begin(); it != m_values.end(); it++)
+		if (it->second.compare(str) == 0)
+			return writeRawValue(it->first, output);
+
+	return false;
+}
+
+
+} //namespace
+

src/libebus/data.h

@@ -0,0 +1,313 @@
+/*
+ * Copyright (C) John Baier 2014 <ebusd@johnm.de>
+ *
+ * This file is part of ebusd.
+ *
+ * ebusd 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ebusd is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ebusd. If not, see http://www.gnu.org/licenses/.
+ */
+
+#ifndef LIBEBUS_DATA_H_
+#define LIBEBUS_DATA_H_
+
+#include "symbol.h"
+#include <string>
+#include <vector>
+#include <map>
+
+namespace libebus
+{
+
+
+/** the message part in which a data field is stored. */
+enum PartType {
+	pt_masterData, // stored in master data
+	pt_slaveData,  // stored in slave data
+	};
+
+/** the available base data types. */
+enum BaseType {
+	bt_str,    // text string in a StringDataField
+	bt_hexstr, // hex digit string in a StringDataField
+	bt_date,   // date in a StringDataField
+	bt_time,   // time in a StringDataField
+	bt_list,   // numeric list value in a ValueListDataField
+	bt_number  // number value in a NumberDataField
+};
+
+/** flags for dataType_t. */
+const unsigned int ADJ = 0x01; // adjustable length, numBytes is maximum length
+const unsigned int BCD = 0x02; // binary representation is BCD
+const unsigned int REV = 0x04; // reverted binary representation (most significant byte first)
+const unsigned int SIG = 0x08; // signed value
+const unsigned int LST = 0x10; // value list is possible (without applied factor)
+const unsigned int DAY = 0x20; // default value list is week days
+
+/** the structure for defining field types with their properties. */
+typedef struct {
+	const char* name;                    // field identifier
+	const unsigned int numBytes;         // number of bytes (maximum length if ADJ flag is set)
+	const BaseType type;                 // base data type
+	const unsigned int flags;            // flags (e.g. BCD)
+	const unsigned int replacement;      // replacement value (fill-up value for bt_str/bt_hexstr)
+	const unsigned int minValueOrLength; // minimum binary value (minimum length of string for StringDataField)
+	const unsigned int maxValueOrLength; // maximum binary value (maximum length of string for StringDataField)
+	const unsigned int divisor;          // divisor for bt_number values (or 0 for non-numeric)
+} dataType_t;
+
+
+/**
+ * @brief Base class for all kinds of data fields.
+ */
+class DataField
+{
+public:
+	/**
+	 * @brief Constructs a new instance.
+	 * @param name the field name.
+	 * @param partType the message part in which the field is stored.
+	 * @param offset the offset to the first symbol in the message part in which the field is stored.
+	 * @param length the number of symbols in the message part in which the field is stored.
+	 * @param dataType the data type definition.
+	 * @param unit the value unit.
+	 * @param comment the field comment.
+	 */
+	DataField(const std::string name, const PartType partType,
+			const unsigned char offset, const unsigned char length,
+			const dataType_t dataType, const std::string unit,
+			const std::string comment)
+		: m_name(name), m_partType(partType), m_offset(offset),
+		  m_length(length), m_dataType(dataType), m_unit(unit),
+		  m_comment(comment) {}
+	/**
+	 * @brief Destructor.
+	 */
+	virtual ~DataField() {}
+
+	/**
+	 * @brief Factory method for creating a new instance.
+	 * @param dstAddress the destination bus address.
+	 * @param isSetMessage whther the field is part of a set message.
+	 * @param it the iterator to traverse for the definition parts.
+	 * @param end the iterator pointing to the end of the definition parts.
+	 */
+	static DataField* create(const unsigned char dstAddress, const bool isSetMessage,
+			std::vector<std::string>::iterator& it, const std::vector<std::string>::iterator end);
+
+	/**
+	 * @brief Reads the value from the master or slave @a SymbolString.
+	 * @param masterData the unescaped master data @a SymbolString for reading binary data.
+	 * @param slaveData the unescaped slave data @a SymbolString for reading binary data.
+	 * @return the formatted value as string.
+	 */
+	const std::string read(SymbolString& masterData, SymbolString& slaveData, bool verbose=false);
+	/**
+	 * @brief Writes the value to the master or slave @a SymbolString.
+	 * @param masterData the unescaped master data @a SymbolString for writing binary data.
+	 * @param slaveData the unescaped slave data @a SymbolString for writing binary data.
+	 * @param value the formatted value as string.
+	 */
+	bool write(const std::string& value, SymbolString& masterData, SymbolString& slaveData);
+
+protected:
+	/**
+	 * @brief Internal method for reading the field from a @a SymbolString.
+	 * @param input the unescaped @a SymbolString to read the binary value from.
+	 * @param output the ostringstream to append the formatted value to.
+	 * @return true if the value was parsed successfully.
+	 */
+	virtual bool readSymbols(SymbolString& input, std::ostringstream& output) = 0;
+	/**
+	 * @brief Internal method for writing the field to a @a SymbolString.
+	 * @param input the istringstream to parse the formatted value from.
+	 * @param output the unescaped @a SymbolString to write the binary value to.
+	 * @return true if the value was formatted successfully.
+	 */
+	virtual bool writeSymbols(std::istringstream& input, SymbolString& output) = 0;
+
+	/** the field name. */
+	const std::string m_name;
+	/** the message part in which the field is stored. */
+	const PartType m_partType;
+	/** the offset to the first symbol in the message part in which the field is stored. */
+	const unsigned char m_offset;
+	/** the number of symbols in the message part in which the field is stored. */
+	const unsigned char m_length;
+	/** the data type definition. */
+	const dataType_t m_dataType;
+	/** the value unit. */
+	const std::string m_unit;
+	/** the field comment. */
+	const std::string m_comment;
+};
+
+
+/**
+ * @brief Base class for all string based data fields.
+ */
+class StringDataField : public DataField
+{
+public:
+	/**
+	 * @brief Constructs a new instance.
+	 * @param name the field name.
+	 * @param partType the message part in which the field is stored.
+	 * @param offset the offset to the first symbol in the message part in which the field is stored.
+	 * @param length the number of symbols in the message part in which the field is stored.
+	 * @param dataType the data type definition.
+	 * @param unit the value unit.
+	 * @param comment the field comment.
+	 */
+	StringDataField(const std::string name, const PartType partType,
+			const unsigned char offset, const unsigned char length,
+			const dataType_t dataType, const std::string unit,
+			const std::string comment)
+		: DataField(name, partType, offset, length, dataType, unit, comment) {}
+	/**
+	 * @brief Destructor.
+	 */
+	virtual ~StringDataField() {}
+
+protected:
+	virtual bool readSymbols(SymbolString& input, std::ostringstream& output);
+	virtual bool writeSymbols(std::istringstream& input, SymbolString& output);
+
+};
+
+
+/**
+ * @brief Base class for all numeric data fields.
+ */
+class NumericDataField : public DataField
+{
+public:
+	/**
+	 * @brief Constructs a new instance.
+	 * @param name the field name.
+	 * @param partType the message part in which the field is stored.
+	 * @param offset the offset to the first symbol in the message part in which the field is stored.
+	 * @param length the number of symbols in the message part in which the field is stored.
+	 * @param dataType the data type definition.
+	 * @param comment the field comment.
+	 * @param unit the value unit.
+	 * @param replacement the (binary) replacement value to use if the value is not set.
+	 */
+	NumericDataField(const std::string name, const PartType partType,
+			const unsigned char offset, const unsigned char length,
+			const dataType_t dataType, const std::string unit,
+			const std::string comment)
+		: DataField(name, partType, offset, length, dataType, unit, comment) {}
+	/**
+	 * @brief Destructor.
+	 */
+	virtual ~NumericDataField() {}
+
+protected:
+	/**
+	 * @brief Internal method for reading the raw value from a @a SymbolString.
+	 * @param input the unescaped @a SymbolString to read the binary value from.
+	 * @param value the variable in which to store the raw value.
+	 * @return true if the value was read successfully.
+	 */
+	bool readRawValue(SymbolString& input, unsigned int& value);
+	/**
+	 * @brief Internal method for writing the raw value to a @a SymbolString.
+	 * @param value the raw value to write.
+	 * @param output the unescaped @a SymbolString to write the binary value to.
+	 * @return true if the value was written successfully.
+	 */
+	bool writeRawValue(unsigned int value, SymbolString& output);
+
+};
+
+/**
+ * @brief Base class for all numeric data fields with a number representation.
+ */
+class NumberDataField : public NumericDataField
+{
+public:
+	/**
+	 * @brief Constructs a new instance.
+	 * @param name the field name.
+	 * @param partType the message part in which the field is stored.
+	 * @param offset the offset to the first symbol in the message part in which the field is stored.
+	 * @param length the number of symbols in the message part in which the field is stored.
+	 * @param dataType the data type definition.
+	 * @param comment the field comment.
+	 * @param unit the value unit.
+	 * @param replacement the (binary) replacement value to use if the value is not set.
+	 * @param factor the factor to apply on the value.
+	 */
+	NumberDataField(const std::string name, const PartType partType,
+			const unsigned char offset, const unsigned char length,
+			const dataType_t dataType, const std::string unit,
+			const std::string comment, const float factor)
+		: NumericDataField(name, partType, offset, length, dataType, unit, comment),
+		  m_factor(factor / dataType.divisor) {}
+	/**
+	 * @brief Destructor.
+	 */
+	virtual ~NumberDataField() {}
+
+protected:
+	virtual bool readSymbols(SymbolString& input, std::ostringstream& output);
+	virtual bool writeSymbols(std::istringstream& input, SymbolString& output);
+
+	/** the factor to apply on the value. */
+	const float m_factor;
+
+};
+
+/**
+ * @brief A numeric data field with a list of value=text assignments and a string representation.
+ */
+class ValueListDataField : public NumericDataField
+{
+public:
+	/**
+	 * @brief Constructs a new instance.
+	 * @param name the field name.
+	 * @param partType the message part in which the field is stored.
+	 * @param offset the offset to the first symbol in the message part in which the field is stored.
+	 * @param length the number of symbols in the message part in which the field is stored.
+	 * @param dataType the data type definition.
+	 * @param comment the field comment.
+	 * @param unit the value unit.
+	 * @param factor the factor to apply on the value.
+	 * @param replacement the (binary) replacement value to use if the value is not set.
+	 * @param values the value=text assignments.
+	 */
+	ValueListDataField(const std::string name, const PartType partType,
+			const unsigned char offset, const unsigned char length,
+			const dataType_t dataType, const std::string unit,
+			const std::string comment, const std::map<unsigned int, std::string> values)
+		: NumericDataField(name, partType, offset, length, dataType, unit, comment),
+		  m_values(values) {}
+	/**
+	 * @brief Destructor.
+	 */
+	virtual ~ValueListDataField() {}
+
+protected:
+	virtual bool readSymbols(SymbolString& input, std::ostringstream& output);
+	virtual bool writeSymbols(std::istringstream& input, SymbolString& output);
+
+	/** the value=text assignments. */
+	std::map<unsigned int, std::string> m_values;
+
+};
+
+
+} //namespace
+
+#endif // LIBEBUS_DATA_H_

src/libebus/result.h

@@ -31,6 +31,7 @@ static const int RESULT_DATA = 2;              // some data received
 static const int RESULT_SYN = 3;               // regular SYN after message received
 static const int RESULT_BUS_LOCKED = 4;        // bus is locked for access
 static const int RESULT_BUS_PRIOR_RETRY = 5;   // retry to access bus
+static const int RESULT_IN_ESC = 6;            // start of escape sequence received
 
 static const int RESULT_ERR_SEND = -1;         // send error
 static const int RESULT_ERR_EXTRA_DATA = -2;   // received bytes > sent bytes

src/libebus/symbol.cpp

@@ -18,6 +18,7 @@
  */
 
 #include "symbol.h"
+#include "result.h"
 #include <iostream>
 #include <iomanip>
 
@@ -27,7 +28,7 @@ namespace libebus
 /**
  * @brief CRC8 lookup table for the polynom 0x9b = x^8 + x^7 + x^4 + x^3 + x^1 + 1.
  */
-static const unsigned char CRC_LOOKUP_TABLE[]
+static const unsigned char CRC_LOOKUP_TABLE[] =
 {
 	0x00, 0x9b, 0xad, 0x36, 0xc1, 0x5a, 0x6c, 0xf7, 0x19, 0x82, 0xb4, 0x2f, 0xd8, 0x43, 0x75, 0xee,
 	0x32, 0xa9, 0x9f, 0x04, 0xf3, 0x68, 0x5e, 0xc5, 0x2b, 0xb0, 0x86, 0x1d, 0xea, 0x71, 0x47, 0xdc,
@@ -49,41 +50,35 @@ static const unsigned char CRC_LOOKUP_TABLE[]
 
 
 SymbolString::SymbolString(const std::string str)
-	: m_crc(0)
+	: m_unescapeState(0), m_crc(0)
 {
 	// parse + escape
 	for (size_t i = 0; i+1 < str.size(); i += 2) {
-		unsigned long value = strtoul(str.substr(i, 2).c_str(), NULL, 16);
-		push_back_escape((unsigned char)value);
+		unsigned long value = strtoul(str.substr(i, 2).c_str(), NULL, 16); // TODO check
+		push_back((unsigned char)value, false, true);
 	}
 	// add CRC + escape
-	push_back_escape(m_crc, false);
+	push_back(m_crc, false, false);
 }
 
-SymbolString::SymbolString(const std::string str, bool escaped)
-	: m_crc(0)
+SymbolString::SymbolString(const std::string str, bool isEscaped)
+	: m_unescapeState(1), m_crc(0)
 {
-	bool previousEscape = false;
-
 	// parse + optionally unescape
 	for (size_t i = 0; i+1 < str.size(); i += 2) {
-		unsigned long value = strtoul(str.substr(i, 2).c_str(), NULL, 16);
-		if (escaped == true) {
-			push_back_unescape((unsigned char)value, previousEscape, false);
-		}
-		else
-			m_data.push_back((unsigned char)value);
+		unsigned long value = strtoul(str.substr(i, 2).c_str(), NULL, 16); // TODO check
+		push_back((unsigned char)value, isEscaped, false);
 	}
 }
 
-const std::string SymbolString::getDataStr(bool unescape)
+const std::string SymbolString::getDataStr(const bool unescape)
 {
 	std::stringstream sstr;
 	bool previousEscape = false;
 
-	for (size_t i = 0; i < size(); i++) {
-		unsigned char value = at(i);
-		if (unescape == true && previousEscape == true) {
+	for (size_t i = 0; i < m_data.size(); i++) {
+		unsigned char value = m_data[i];
+		if (m_unescapeState == 0 && unescape == true && previousEscape == true) {
 			if (value == 0x00) {
 				sstr << "a9"; // ESC
 			}
@@ -95,7 +90,7 @@ const std::string SymbolString::getDataStr(bool unescape)
 			}
 			previousEscape = false;
 		}
-		else if (unescape == true && value == ESC) {
+		else if (m_unescapeState == 0 && unescape == true && value == ESC) {
 			previousEscape = true; // escape sequence not yet finished
 		}
 		else {
@@ -107,56 +102,80 @@ const std::string SymbolString::getDataStr(bool unescape)
 	return sstr.str();
 }
 
-void SymbolString::push_back_escape(const unsigned char value, bool updateCRC)
+int SymbolString::push_back(const unsigned char value, const bool isEscaped, const bool updateCRC)
 {
-	if (value == ESC) {
-		m_data.push_back(ESC);
-		m_data.push_back(0x00);
-		if (updateCRC) {
-			addCRC(ESC);
-			addCRC(0x00);
+	if (m_unescapeState == 0) { // store escaped data
+		if (isEscaped == false && value == ESC) {
+			m_data.push_back(ESC);
+			m_data.push_back(0x00);
+			if (updateCRC) {
+				addCRC(ESC);
+				addCRC(0x00);
+			}
 		}
-	}
-	else if (value == SYN) {
-		m_data.push_back(ESC);
-		m_data.push_back(0x01);
-		if (updateCRC) {
-			addCRC(ESC);
-			addCRC(0x01);
+		else if (isEscaped == false && value == SYN) {
+			m_data.push_back(ESC);
+			m_data.push_back(0x01);
+			if (updateCRC) {
+				addCRC(ESC);
+				addCRC(0x01);
+			}
 		}
+		else {
+			m_data.push_back(value);
+			if (updateCRC) {
+				addCRC(value);
+			}
+		}
+		return RESULT_OK;
 	}
-	else {
+	else if (isEscaped == false) {
+		if (m_unescapeState != 1)
+			return RESULT_ERR_ESC; // invalid unescape state
 		m_data.push_back(value);
+		if (updateCRC) {
+			if (value == ESC) {
+				addCRC(ESC);
+				addCRC(0x00);
+			}
+			else if (value == SYN) {
+				addCRC(ESC);
+				addCRC(0x01);
+			}
+			else {
+				addCRC(value);
+			}
+		}
+		return RESULT_OK;
+	}
+	else if (m_unescapeState != 1) {
 		if (updateCRC) {
 			addCRC(value);
 		}
-	}
-}
-
-unsigned char SymbolString::push_back_unescape(const unsigned char value, bool& previousEscape, bool updateCRC)
-{
-	if (updateCRC) {
-		addCRC(value);
-	}
-	if (previousEscape == true) {
 		if (value == 0x00) {
 			m_data.push_back(ESC);
-			previousEscape = false;
-			return ESC;
+			m_unescapeState = 1;
+			return RESULT_OK;
 		}
 		if (value == 0x01) {
 			m_data.push_back(SYN);
-			previousEscape = false;
-			return SYN;
+			m_unescapeState = 1;
+			return RESULT_OK;
 		}
-		return 0; // invalid escape sequence
+		return RESULT_ERR_ESC; // invalid escape sequence
 	}
-	if (value == ESC) {
-		previousEscape = true;
-		return 1; // escape sequence not yet finished
+	else if (value == ESC) {
+		if (updateCRC) {
+			addCRC(value);
+		}
+		m_unescapeState = 2;
+		return RESULT_IN_ESC;
+	}
+	if (updateCRC) {
+		addCRC(value);
 	}
 	m_data.push_back(value);
-	return value;
+	return RESULT_OK;
 }
 
 void SymbolString::addCRC(const unsigned char value) {

src/libebus/symbol.h

@@ -37,72 +37,62 @@ static const unsigned char BROADCAST = 0xFE; // the broadcast destination addres
 
 
 /**
- * @brief A string of bus symbols.
+ * @brief A string of escaped or unescaped bus symbols.
  */
 class SymbolString
 {
 
 public:
 	/**
-	 * @brief Creates a new empty SymbolString.
+	 * @brief Creates a new unescaped empty instance.
+	 * @param escaped whether to create an escaped instance.
 	 */
-	SymbolString() : m_crc(0) {}
+	SymbolString() : m_unescapeState(1), m_crc(0) {}
 	/**
-	 * @brief Creates a new escaped SymbolString from an unescaped hex string and adds the calculated CRC.
+	 * @brief Creates a new escaped instance from an unescaped hex string and adds the calculated CRC.
 	 * @param str the unescaped hex string.
 	 */
 	SymbolString(const std::string str);
 	/**
-	 * @brief Creates a new unescaped SymbolString from a hex string.
-	 * @param escaped whether the hex string is escaped and shall be unescaped.
+	 * @brief Creates a new unescaped instance from a hex string.
+	 * @param isEscaped whether the hex string is escaped and shall be unescaped.
 	 * @param str the hex string.
 	 */
-	SymbolString(const std::string str, bool escaped);
+	SymbolString(const std::string str, const bool isEscaped);
 	/**
 	 * @brief Returns the symbols as hex string.
-	 * @param escaped whether to unescape the symbols.
+	 * @param unescape whether to unescape an escaped instance.
 	 * @return the symbols as hex string.
 	 */
-	const std::string getDataStr(bool unescape=false);
+	const std::string getDataStr(const bool unescape=true);
 	/**
-	 * @brief Returns the symbol at the specified index.
+	 * @brief Returns a reference to the symbol at the specified index.
 	 * @param index the index of the symbol to return.
-	 * @return the symbol at the specified index.
-	 * @throw std::out_of_range if @a index is invalid.
+	 * @return the reference to the symbol at the specified index.
 	 */
-	unsigned char at(const size_t index) { return m_data.at(index); }
+	unsigned char& operator[](const size_t index) { if (index >= m_data.size()) m_data.resize(index+1, 0); return m_data[index]; }
 	/**
 	 * @brief Returns the symbol at the specified index.
 	 * @param index the index of the symbol to return.
 	 * @return the symbol at the specified index.
 	 */
-	unsigned char operator[](const size_t index) { return m_data[index]; }
+	const unsigned char& operator[](const size_t index) const { return m_data[index]; }
 	/**
-	 * @brief Returns the symbol at the specified index.
-	 * @param index the index of the symbol to return.
-	 * @return the symbol at the specified index.
+	 * @brief Returns whether this instance is equal to the other instance.
+	 * @param other the other instance.
+	 * @return true if this instance is equal to the other instance (i.e. both escaped or both unescaped and same symbols).
 	 */
-	unsigned char operator[](const size_t index) const { return m_data[index]; }
+	bool operator==(SymbolString other) { return (m_unescapeState==0)==(m_unescapeState==0) && m_data==other.m_data; }
 	/**
-	 * @brief Inserts a the symbol at the specified index.
-	 * @param index the index at which to insert the symbol.
-	 * @param value the symbol to insert.
-	 */
-	void insert(const size_t index, const unsigned char value) { m_data.insert(m_data.begin()+index, value); }
-	/**
-	 * @brief Appends a the symbol to the end of the symbol string and escapes it if necessary.
+	 * @brief Appends a the symbol to the end of the symbol string and escapes/unescapes it if necessary.
 	 * @param value the symbol to append.
+	 * @param isEscaped whether the symbol is escaped.
 	 * @param updateCrc whether to update the calculated CRC in @a m_crc.
+	 * @return RESULT_OK if another symbol was appended,
+	 * RESULT_IN_ESC if this is an unescaped instance and the symbol is escaped and the start of the escape sequence was received,
+	 * RESULT_ERR_ESC if this is an unescaped instance and an invalid escaped sequence was detected.
 	 */
-	void push_back_escape(const unsigned char value, bool updateCRC=true);
-	/**
-	 * @brief Appends a the symbol to the end of the symbol string and unescapes it.
-	 * @param value the symbol to append.
-	 * @param previousEscape whether the previous value was the escape symbol (set to false for the initial call).
-	 * @param updateCrc whether to update the calculated CRC in @a m_crc.
-	 * @return if previousEscape is false on return: the unescaped symbol. otherwise: zero if the escape sequence was invalid, one if the escape sequence is not yet finished.
-	 */
-	unsigned char push_back_unescape(const unsigned char value, bool& previousEscape, bool updateCRC=true);
+	int push_back(const unsigned char value, const bool isEscaped, const bool updateCRC=true);
 	/**
 	 * @brief Returns the number of symbols in this symbol string.
 	 * @return the number of available symbols.
@@ -116,7 +106,7 @@ public:
 	/**
 	 * @brief Clears the symbols.
 	 */
-	void clear() { m_crc=0; m_data.clear(); }
+	void clear() { m_data.clear(); m_unescapeState = m_unescapeState==0 ? 0 : 1; m_crc = 0; }
 
 private:
 	/**
@@ -129,6 +119,12 @@ private:
 	 * @brief the string of bus symbols.
 	 */
 	std::vector<unsigned char> m_data;
+	/**
+	 * @brief 0 if the symbols in @a m_data are escaped,
+	 * 1 if the symbols in @a m_data are unescaped and the last symbol passed to @a push_back was a normal symbol,
+	 * 2 if the symbols in @a m_data are unescaped and the last symbol passed to @a push_back was the escape symbol.
+	 */
+	int m_unescapeState;
 	/**
 	 * @brief the calculated CRC.
 	 */

src/test/Makefile.am

@@ -5,6 +5,7 @@ AM_CXXFLAGS = -fpic \
 
 noinst_PROGRAMS = test_port \
 		  test_symbol \
+		  test_data \
 		  test_bus \
 		  test_commands \
 		  test_configfile \
@@ -17,6 +18,9 @@ test_port_LDADD = $(top_srcdir)/src/libebus/libebus.a
 test_symbol_SOURCES = test_symbol.cpp
 test_symbol_LDADD = $(top_srcdir)/src/libebus/libebus.a
 
+test_data_SOURCES = test_data.cpp
+test_data_LDADD = $(top_srcdir)/src/libebus/libebus.a
+
 test_bus_SOURCES = test_bus.cpp
 test_bus_LDADD = $(top_srcdir)/src/libebus/libebus.a
 

src/test/test_data.cpp

@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) John Baier 2014 <ebusd@johnm.de>
+ *
+ * This file is part of libebus.
+ *
+ * libebus 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * libebus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with libebus. If not, see http://www.gnu.org/licenses/.
+ */
+
+#include "data.h"
+#include <iostream>
+#include <iomanip>
+
+using namespace libebus;
+
+int main ()
+{
+	std::string checks[][4] = {
+		//name;position(s);type;factor;unit;comment
+//		{"temp;1;d2b;;°C;Aussentemperatur","temp=18.004 °C [Aussentemperatur]","10fe070009019258042126100714cc", "00"},
+//		{"zeit;1;ttm;2;Uhr;","zeit=22:40 Uhr","10feffff0188", "00"},
+		{"x;1-10;hex","53 70 65 69 63 68 65 72 20 20", "10fe07000a53706569636865722020", "00"},
+		{"x;1;bti","21:04:58","10fe070009580421", "00"},
+		{"x;1;bda","26.10.2014","10fe07000926100714", "00"},
+		{"x;1-3;bda","26.10.2014","10fe070003261014", "00"},
+		{"x;1;hdy","Sun","10fe07000307", "00"},
+		{"x;1;bdy","Sun","10fe07000306", "00"},
+		{"x;1;d2b","18.004","10fe0700090112", "00"},
+		{"x;1;d2c","288.062","10fe0700090112", "00"},
+		{"x;1;ttm","22:40","10feffff0188", "00"},
+		{"x;1;bcd","26","10feffff0126", "00"},
+		{"x;1;bcd","-","10feffff01ff", "00"},
+		{"x;1;uch","38","10feffff0126", "00"},
+		{"x;1;sch","-90","10feffff01a6", "00"},
+		{"x;1;d1b","-90","10feffff01a6", "00"},
+		{"x;1;d1c","19.500","10feffff0127", "00"},
+		{"x;1;uin","38","10feffff022600", "00"},
+		{"x;1;sin","-90","10feffff02a6ff", "00"},
+		{"x;1;ulg","38","10feffff0426000000", "00"},
+		{"x;1;slg","-90","10feffff04a6ffffff", "00"},
+		{"x;1;flt","-0.090","10feffff02a6ff", "00"},
+		{"x;1-9;str","hallo Du!","10feffff0868616c6c6f20447521", "00"},
+		{"x;1-9;str","hallo Du ","10feffff0868616c6c6f20447520", "00"},
+		{"new;1;uch;1=test,2=high,3=off,4=on","on","10feffff0104", "00"},
+	};
+	for (size_t i = 0; i < sizeof(checks)/sizeof(checks[0]); i++) {
+		std::istringstream isstr(checks[i][0]);
+		std::string expectStr = checks[i][1];
+		SymbolString mstr = SymbolString(checks[i][2], false);
+		SymbolString sstr = SymbolString(checks[i][3], false);
+		std::string item;
+		std::vector<std::string> entries;
+
+		while (std::getline(isstr, item, ';') != 0)
+			entries.push_back(item);
+
+		std::vector<std::string>::iterator it = entries.begin();
+		DataField* field = DataField::create(mstr[1], false, it, entries.end());
+
+		if (field == NULL) {
+			std::cout << "create \"" << checks[i][0] << "\" invalid: null" << std::endl;
+			return 1;
+		}
+		std::cout << "create \"" << checks[i][0] << "\" successful" << std::endl;
+
+
+		std::string gotStr = field->read(mstr, sstr);
+
+		if (strcasecmp(gotStr.c_str(), expectStr.c_str()) == 0)
+			std::cout << "read successful: " << gotStr << std::endl;
+		else
+			std::cout << "read invalid: got " << gotStr
+				<< ", expected " << expectStr << std::endl;
+
+		SymbolString writeMstr = SymbolString(mstr.getDataStr().substr(0, 10), false);
+		SymbolString writeSstr = SymbolString(sstr.getDataStr().substr(0, 2), false);
+		if (field->write(gotStr, writeMstr, writeSstr) == false)
+			std::cout << "write failed" << std::endl;
+		else {
+			if (mstr == writeMstr && sstr == writeSstr)
+				std::cout << "write successful" << std::endl;
+			else {
+				std::cout << "write invalid: ";
+				if (mstr == writeMstr)
+					std::cout << "master OK";
+				else
+					std::cout << "master got " << writeMstr.getDataStr() << ", expected " << mstr.getDataStr();
+
+				if (sstr == writeSstr)
+					std::cout << ", slave OK";
+				else
+					std::cout << ", slave got " << writeSstr.getDataStr() << ", expected " << sstr.getDataStr();
+				std::cout << std::endl;
+			}
+		}
+		delete field;
+	}
+	return 0;
+
+}

src/test/test_symbol.cpp

@@ -25,15 +25,9 @@ using namespace libebus;
 
 int main ()
 {
-	SymbolString sstr("10feb5050427a915aa");
+	SymbolString sstr = SymbolString("10feb5050427a915aa");
 
-	std::stringstream out;
-	for (size_t i = 0; i<sstr.size(); i++) {
-		out << std::nouppercase << std::setw(2) << std::hex
-			<< std::setfill('0') << static_cast<unsigned>(sstr[i]);
-	}
-
-	std::string gotStr = out.str(), expectStr = "10feb5050427a90015a90177";
+	std::string gotStr = sstr.getDataStr(false), expectStr = "10feb5050427a90015a90177";
 
 	if (strcasecmp(gotStr.c_str(), expectStr.c_str()) == 0)
 		std::cout << "ctor escaped successful." << std::endl;
@@ -54,7 +48,7 @@ int main ()
 			<< std::setfill('0') << static_cast<unsigned>(expectCrc)
 			<< std::endl;
 
-	gotStr = sstr.getDataStr(true), expectStr = "10feb5050427a915aa77";
+	gotStr = sstr.getDataStr(), expectStr = "10feb5050427a915aa77";
 
 	if (strcasecmp(gotStr.c_str(), expectStr.c_str()) == 0)
 		std::cout << "unescape successful." << std::endl;
@@ -63,7 +57,9 @@ int main ()
 			<< ", expected " << expectStr << std::endl;
 
 	sstr = SymbolString("10feb5050427a90015a90177", true);
-	gotStr = sstr.getDataStr(false);
+
+	gotStr = sstr.getDataStr();
+
 	if (strcasecmp(gotStr.c_str(), expectStr.c_str()) == 0)
 		std::cout << "ctor unescaped successful." << std::endl;
 	else