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/***********************************************************************************/
/*  Copyright 2009 WSL Institute for Snow and Avalanche Research    SLF-DAVOS      */
/***********************************************************************************/
/* This file is part of MeteoIO.
    MeteoIO is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    MeteoIO 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with MeteoIO.  If not, see <http://www.gnu.org/licenses/>.
*/
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#include <meteoio/plugins/libsmet.h>
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#include <errno.h>
#include <string.h>
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#include <limits>
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#if defined _WIN32 || defined __MINGW32__
	#include <windows.h>
#else
	#include <sys/stat.h>
#endif

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using namespace std;

namespace smet {

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const char* SMETCommon::smet_version = "1.1";
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set<string> SMETCommon::all_mandatory_header_keys = set<std::string>();
set<string> SMETCommon::all_optional_header_keys  = set<std::string>();
set<string> SMETCommon::all_decimal_header_values = set<std::string>();

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SMETException::SMETException(const std::string& message, const std::string& position)
              : msg( (position.empty())? "At unknown position: " + message : position + ": " + message) {}
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SMETException::~SMETException() throw() {}

const char* SMETException::what() const throw()
{
	return msg.c_str();
}

const bool SMETCommon::__init = SMETCommon::initStaticData();
bool SMETCommon::initStaticData()
{
	all_mandatory_header_keys.insert("station_id");
	all_mandatory_header_keys.insert("nodata");
	all_mandatory_header_keys.insert("fields");

	all_optional_header_keys.insert("latitude");
	all_optional_header_keys.insert("longitude");
	all_optional_header_keys.insert("altitude");
	all_optional_header_keys.insert("easting");
	all_optional_header_keys.insert("northing");
	all_optional_header_keys.insert("epsg");

	all_optional_header_keys.insert("station_name");
	all_optional_header_keys.insert("tz");
	all_optional_header_keys.insert("creation");
	all_optional_header_keys.insert("source");
	all_optional_header_keys.insert("units_offset");
	all_optional_header_keys.insert("units_multiplier");
	all_optional_header_keys.insert("comment");

	all_decimal_header_values.insert("nodata");
	all_decimal_header_values.insert("latitude");
	all_decimal_header_values.insert("longitude");
	all_decimal_header_values.insert("altitude");
	all_decimal_header_values.insert("easting");
	all_decimal_header_values.insert("northing");
	all_decimal_header_values.insert("epsg");
	all_decimal_header_values.insert("tz");

	return true;
}

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#if defined _WIN32 || defined __MINGW32__
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bool SMETCommon::fileExists(const std::string& filename)
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{
	const DWORD attributes = GetFileAttributes( filename.c_str() );
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	if (attributes==INVALID_FILE_ATTRIBUTES || attributes==FILE_ATTRIBUTE_VIRTUAL
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	     || attributes==FILE_ATTRIBUTE_DIRECTORY || attributes==FILE_ATTRIBUTE_DEVICE)
		return false;
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	return true;
}
#else
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bool SMETCommon::fileExists(const std::string& filename)
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{
	struct stat buffer ;

	if ((stat( filename.c_str(), &buffer))!=0) {//File exists if stat returns 0
		return false;
	}
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	if (S_ISREG(buffer.st_mode) || S_ISFIFO(buffer.st_mode) || S_ISLNK(buffer.st_mode))
		return true;
	else
		return false; //exclude char device, block device, sockets, etc
}
#endif

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bool SMETCommon::validFileAndPath(const std::string& filename)
{
#if defined _WIN32 || defined __MINGW32__ || defined __CYGWIN__
	const size_t startpos = filename.find_first_not_of(" \t\n"); // Find the first character position after excluding leading blank spaces
	const size_t invalid_char = filename.find_first_of("\000*:<>?|"); //find possible invalid characters
#else
	const size_t startpos = filename.find_first_not_of(" \t\n"); // Find the first character position after excluding leading blank spaces
	const size_t invalid_char = filename.find_first_of("\000"); //find possible invalid characters
#endif
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	if ((startpos!=0) || (invalid_char!=std::string::npos) || (filename==".") || (filename=="..")) {
		return false;
	}
	return true;
}

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void SMETCommon::copy_file(const std::string& src, const std::string& dest)
{
	if (src == dest) return; //copying to the same file doesn't make sense, but is no crime either

	if (!fileExists(src)) throw SMETException("File '"+src+"' does not exist", AT);
	std::ifstream fin(src.c_str(), std::ios::binary);
	if (fin.fail()) throw SMETException("Failed to open file '"+src+"'", AT);

	if (!validFileAndPath(dest)) throw SMETException("Destination file name '"+dest+"' is invalid", AT);
	std::ofstream fout(dest.c_str(), std::ios::binary);
	if (fout.fail()) {
		fin.close();
		throw SMETException("Failed to open destination file '"+dest+"'", AT);
	}

	fout << fin.rdbuf();

	fin.close();
	fout.close();
}

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double SMETCommon::convert_to_double(const std::string& in_string)
{
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	char* conversion_end = NULL;
	const double conversion_value = strtod(in_string.c_str(), &conversion_end);
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	if (*conversion_end == '\0') {
		return conversion_value;
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	} else {
		throw SMETException("Value \"" + in_string + "\" cannot be converted to double", SMET_AT);
	}
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}

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int SMETCommon::convert_to_int(const std::string& in_string)
{
	istringstream ss(in_string);
	int value;
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	if (!(ss >> value)) throw SMETException("Value \"" + in_string + "\" cannot be converted to int", SMET_AT);
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	return value;
}

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void SMETCommon::trim(std::string& str)
{
	const std::string whitespaces(" \t\f\v\n\r");
	const size_t startpos = str.find_first_not_of(whitespaces); // Find the first character position after excluding leading blank spaces
	const size_t endpos = str.find_last_not_of(whitespaces); // Find the first character position from reverse af

	// if all spaces or empty return an empty string
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	if (( std::string::npos == startpos ) || ( std::string::npos == endpos)) {
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		str.clear();
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	} else {
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		str.erase(endpos+1); //right trim
		str.erase(0, startpos); //left trim
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	}
}

bool SMETCommon::readKeyValuePair(const std::string& in_line, const std::string& delimiter,
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                                  std::map<std::string,std::string>& out_map)
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{
	//size_t pos = in_line.find(delimiter); //first occurence of '='

	size_t pos = std::string::npos;
	if ((delimiter==" ") || (delimiter=="\t")) {
		pos = in_line.find_first_of(" \t", 0);
	} else {
		pos = in_line.find(delimiter); //first occurence of '='
	}


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	if (pos != std::string::npos) { //ignore in_lines that are empty or without '='
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		std::string key = in_line.substr(0, pos);
		std::string value = in_line.substr(pos + 1);

		SMETCommon::trim(key);
		SMETCommon::trim(value);

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		if (key.empty() || value.empty()) {
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			return false;
		}

		out_map[key] = value;
	} else {
		return false;
	}

	return true;
}

void SMETCommon::stripComments(std::string& str)
{
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	const size_t found = str.find_first_of("#;");
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	if (found != std::string::npos){
		str.erase(found); //rest of line disregarded
	}
}

void SMETCommon::toUpper(std::string& str)
{
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	std::transform(str.begin(), str.end(),str.begin(), ::toupper);
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}

char SMETCommon::getEoln(std::istream& fin)
{
	std::streambuf* pbuf;
	char tmp = '0';
	int chars = 0;

	const std::streampos position = fin.tellg();

	do {
		fin.get(tmp);
		chars++;

		if ((tmp == '\r') || (tmp == '\n')) {
			char peekc = tmp;
			while ((!fin.eof() && ((peekc=='\r') || (peekc=='\n')))) {
				tmp = peekc;
				fin.get(peekc);
				chars++;
			}
			pbuf = fin.rdbuf();
			pbuf->pubseekpos(position); //rewind
			fin.clear(); //reset eof flag, etc
			return tmp;
		}
	} while ((chars < 3000) && (!fin.eof()));

	pbuf = fin.rdbuf();
	pbuf->pubseekpos(position); //rewind
	fin.clear(); //reset eof flag, etc

	return '\n';
}

bool SMETCommon::is_decimal(const std::string& value)
{
	istringstream ss(value);
	double doublevalue;
	if (!(ss >> doublevalue)) return false;

	return true;
}

size_t SMETCommon::readLineToVec(const std::string& line_in, std::vector<std::string>& vec_string)
{
	vec_string.clear();
	std::istringstream iss(line_in); //construct inputstream with the string line as input

	std::string tmp_string;
	while (!iss.eof()) {
		iss >> std::skipws >> tmp_string;

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		if (!tmp_string.empty()) {
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			vec_string.push_back( tmp_string );
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		}
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		tmp_string.clear();
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	}

	return vec_string.size();
}

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////////////////////////////////////////////////////////////
//// SMETWriter class
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SMETWriter::SMETWriter(const std::string& in_filename, const SMETType& in_type)
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           : other_header_keys(), ascii_precision(), ascii_width(), header(), mandatory_header_keys(),
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             filename(in_filename), nodata_string(), smet_type(in_type), nodata_value(-999.), nr_of_fields(0),
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             julian_field(0), timestamp_field(0), location_wgs84(0), location_epsg(0),
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             location_in_header(false), location_in_data_wgs84(false), location_in_data_epsg(false),
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             timestamp_present(false), julian_present(false), file_is_binary(false), append_mode(false), append_possible(false) {}
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//what the caller MUST provide: 
//	* the fields header (for checks)
//	* the ascii width and precision
//	* nodata_value provided through set_header_value() calls
//HACK: the multipliers and offsets are not handled yet...
//for now, we do the most basic append: all the data after the first insertion point is deleted
SMETWriter::SMETWriter(const std::string& in_filename, const std::string& in_fields, const double& in_nodata)
           : other_header_keys(), ascii_precision(), ascii_width(), header(), mandatory_header_keys(),
             filename(in_filename), nodata_string(), smet_type(ASCII), nodata_value(in_nodata), nr_of_fields(0),
             julian_field(0), timestamp_field(0), location_wgs84(0), location_epsg(0),
             location_in_header(false), location_in_data_wgs84(false), location_in_data_epsg(false),
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             timestamp_present(false), julian_present(false), file_is_binary(false), append_mode(true), append_possible(false)
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{
	SMETReader reader(filename);
	smet_type = (reader.isAscii)? ASCII : BINARY;
	nodata_string = reader.get_header_value("nodata");
	//nodata_value = reader.nodata_value; //we trust the value provided to the constructor
	
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	nr_of_fields = reader.nr_of_fields; //in SMETReader, this does NOT contain the timestamp
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	julian_field = reader.julian_field;
	timestamp_field = reader.timestamp_field;
	timestamp_present = reader.timestamp_present;
	julian_present = reader.julian_present;
	
	location_wgs84 = reader.location_wgs84;
	location_epsg = reader.location_epsg;
	location_in_header = reader.location_in_header(WGS84) || reader.location_in_header(EPSG);
	location_in_data_wgs84 = reader.location_in_data(WGS84);
	location_in_data_epsg = reader.location_in_data(EPSG);
	
	//check that the fields match
	std::vector<std::string> vecFields;
	SMETCommon::readLineToVec(in_fields, vecFields);
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	if (timestamp_present) {
		if (vecFields[timestamp_field]!="timestamp") {
			std::ostringstream ss;
			ss << "Timestamp should be in field at position " << timestamp_field << "when  appending data to file '" << filename << "' but instead '" << reader.get_field_name(timestamp_field) << "' was found";
			throw SMETException(ss.str(), AT);
		}
		vecFields.erase( vecFields.begin()+timestamp_field );
	}
	if (julian_present) {
		if (vecFields[julian_field]!="julian") {
			std::ostringstream ss;
			ss << "Julian should be in field at position " << julian_field << "when  appending data to file '" << filename << "' but instead '" << reader.get_field_name(julian_field) << "' was found";
			throw SMETException(ss.str(), AT);
		}
		vecFields.erase( vecFields.begin()+julian_field );
	}
	
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	if (nr_of_fields!=vecFields.size()) {
		std::ostringstream ss;
		ss << "Trying to write " << vecFields.size() << " fields in file '" << filename << "' that has " << nr_of_fields << " fields";
		throw SMETException(ss.str(), AT);
	}
	for (size_t ii=0; ii<nr_of_fields; ii++) {
		if (vecFields[ii] != reader.get_field_name(ii)) {
			std::ostringstream ss;
			ss << "Trying to write field '" << vecFields[ii] << "' at position " << ii << " in file '" << filename << "' when it should be '" << reader.get_field_name(ii);
			throw SMETException(ss.str(), AT);
		}
	}
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	//adjust the number of fields to reflect the potential presence of timestamp and julian
	if (timestamp_present) nr_of_fields++;
	if (julian_present) nr_of_fields++;
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}
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void SMETWriter::set_header_value(const std::string& key, const double& value)
{
	//check if key is decimal, transform to string and add to header
	if (SMETCommon::all_decimal_header_values.find(key) != SMETCommon::all_decimal_header_values.end()){
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		ostringstream ss;
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		if ((key == "latitude") || (key == "longitude") || (key == "easting") || (key == "northing")){
			ss << fixed << setprecision(6) << value;
		} else if (key == "altitude"){
			ss << fixed << setprecision(1) << value;
		} else if ((key == "epsg") || (key == "tz")){
			ss << fixed << setprecision(0) << value;
		} else {
			ss << value; //for nodata
		}

		set_header_value(key, ss.str());
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	} else { //It's a non-standard header value
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		ostringstream ss;
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		ss << value; //for nodata
		set_header_value(key, ss.str());
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	}
}

void SMETWriter::set_header_value(const std::string& key, const std::string& value)
{
	//check if header key/value pair is valid
	if (valid_header_pair(key, value)){
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		header[key] = value;
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		if ((SMETCommon::all_optional_header_keys.find(key) == SMETCommon::all_optional_header_keys.end())
		    && (SMETCommon::all_mandatory_header_keys.find(key) == SMETCommon::all_mandatory_header_keys.end()))
			other_header_keys.push_back(key);
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	} else {
		throw SMETException("Invalid, inconsistent or unknown key/value pair: " + key + " = " + value, SMET_AT);
	}
}

bool SMETWriter::valid_header_pair(const std::string& key, const std::string& value)
{
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	bool key_ok = true;
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	if (SMETCommon::all_mandatory_header_keys.find(key) != SMETCommon::all_mandatory_header_keys.end()){
		mandatory_header_keys.insert(key);
		key_ok = true;
	}

	//nodata value needs extra treatment
	if (key == "nodata"){
		istringstream ss(value);
		if (!(ss >> nodata_value)) return false;
		nodata_string = value;
	}

	//Using WGS_84 coordinate system
	if (key == "latitude")  location_wgs84 |= 1;
	else if (key == "longitude") location_wgs84 |= 2;
	else if (key == "altitude")  location_wgs84 |= 4;

	//Using an EPSG coordinate system
	if (key == "easting")  location_epsg |= 1;
	else if (key == "northing") location_epsg |= 2;
	else if (key == "altitude") location_epsg |= 4;
	else if (key == "epsg")     location_epsg |= 8;

	//Now do some value checks
	if (key == "epsg"){
		istringstream ss(value);
		int intvalue;
		if (!(ss >> intvalue)) return false;
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	}
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	if (SMETCommon::all_decimal_header_values.find(key) != SMETCommon::all_decimal_header_values.end()){
		//check if value is a double value
		if (!SMETCommon::is_decimal(value)) return false;
	}

	if ((location_epsg == 15) || (location_wgs84 == 7))
		location_in_header = true;

	//Rudimentary check on keys: fields, units_offset, units_multiplier
	if ((key == "fields") || (key == "units_offset") || (key == "units_multiplier"))
		key_ok = check_fields(key, value);

	return key_ok;
}

bool SMETWriter::check_fields(const std::string& key, const std::string& value)
{
	vector<string> tmp_vec;
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	const size_t counter = SMETCommon::readLineToVec(value, tmp_vec);
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	//Firstly: Check if number of fields is consistent
	if (nr_of_fields != 0){
		if (counter != nr_of_fields) return false;
	} else {
		nr_of_fields = counter;
	}
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	if (key == "fields"){
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        size_t count_wgs84 = 0, count_epsg = 0;
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		//check if location is in data and if timestamp is present
		for (size_t ii = 0; ii<tmp_vec.size(); ii++){
			if (tmp_vec[ii] == "latitude") count_wgs84++;
			else if (tmp_vec[ii] == "longitude") count_wgs84++;
			else if (tmp_vec[ii] == "easting") count_epsg++;
			else if (tmp_vec[ii] == "northing") count_epsg++;

			if (tmp_vec[ii] == "altitude") {
				count_wgs84++;
				count_epsg++;
			}

			if (tmp_vec[ii] == "timestamp"){
				if (timestamp_present) return false; //no duplicate timestamp field allowed
				timestamp_present = true;
				timestamp_field = ii;
			}

			if (tmp_vec[ii] == "julian"){
				if (julian_present) return false; //no duplicate julian field allowed
				julian_present = true;
				julian_field = ii;
			}
		}

		if (count_wgs84 == 3)
			location_in_data_wgs84 = true;

		if (count_epsg == 3)
			location_in_data_epsg = true;
	} else {
		//every value in units_offset and units_multiplier must be a decimal
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		for (vector<string>::const_iterator it = tmp_vec.begin(); it != tmp_vec.end(); ++it)
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			if (!SMETCommon::is_decimal(*it)) return false;
	}

	return true;
}

bool SMETWriter::valid_header()
{
	if (mandatory_header_keys.size() != 3)
		return false;

	if (location_in_data_epsg){ //EPSG code must be in the header anyway
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		const map<string,string>::const_iterator it = header.find("epsg");
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		if (it == header.end()){
			return false;
		} else {
			return true;
		}
	}

	if (location_in_header || location_in_data_wgs84)
		return true;

	return false;
}

void SMETWriter::write(const std::vector<std::string>& vec_timestamp, const std::vector<double>& data)
{
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	if (vec_timestamp.empty() || data.empty()) return;
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	if (!SMETCommon::validFileAndPath(filename)) throw SMETException("Invalid file name \""+filename+"\"", AT);
	errno = 0;
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	ofstream fout;
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	if (append_mode) {
		if (!append_possible) {
			//check where to insert the new data
			SMETReader reader(filename);
			const std::string last_timestamp = reader.getLastTimestamp();
			if (last_timestamp.empty() || last_timestamp>=vec_timestamp[0])
				reader.truncate_file(vec_timestamp[0]);
			
			append_possible = true;
		}
542
		fout.open(filename.c_str(), ios::binary | ofstream::app);
543
	} else { //normal mode
544
		fout.open(filename.c_str(), ios::binary);
545
	}
546
	
547
	if (fout.fail()) {
548
		ostringstream ss;
549
		ss << "Error opening file \"" << filename << "\" for writing, possible reason: " << strerror(errno);
550
551
		throw SMETException(ss.str(), SMET_AT);
	}
552

553
	if (!append_mode) write_header(fout); //Write the header info, always in ASCII format
554

555
	if (nr_of_fields == 0) {
556
		fout.close();
557
558
559
		return;
	}

560
561
	if (!timestamp_present) {
		fout.close();
562
		throw SMETException("No timestamp present when writing file \""+filename+"\", use write(const vector<double>& data)", SMET_AT);
563
	}
564
565

	const size_t nr_of_data_fields = nr_of_fields - 1;
566
	if (nr_of_fields<=1) { //avoid division by zero in the next block
567
		cerr << "[W] Attempting to write a dataset that contains no fields to file \"" + filename + "\"!\n";
568
		fout.close();
569
		return;
570
	}
571

572
	const size_t nr_of_lines = data.size() / (nr_of_fields-1);
573
574
	if ((nr_of_lines != vec_timestamp.size()) || ((data.size() % (nr_of_fields-1)) != 0)) {
		fout.close();
575
576
577
		ostringstream os;
		os << "Inconsistency between the number of timestamp (" << vec_timestamp.size() << ")  and number of data points (" << data.size() << "/" << nr_of_fields-1 << ") detected for file \""+filename+"\", recheck your data";
		throw SMETException(os.str(), SMET_AT);
578
	}
579

580
	std::vector<double> current_data(nr_of_fields-1);
581
582
	check_formatting();

583
584
	if (smet_type == ASCII) {
		for (size_t ii=0; ii<nr_of_lines; ii++) {
585
			const size_t offset = ii*(nr_of_fields-1);
586
			if (!data.empty())
587
				copy(data.begin()+offset, data.begin()+offset+nr_of_data_fields, current_data.begin());
588
			write_data_line_ascii(vec_timestamp[ii], current_data, fout);
589
590
		}
	} else {
591
		fout.close();
592
		throw SMETException("Cannot write binary file \""+filename+"\" with a timestamp, use julian instead", SMET_AT);
593
594
	}

595
	fout.close();
596
597
598
599
}

void SMETWriter::write(const std::vector<double>& data)
{
600
601
	if (!SMETCommon::validFileAndPath(filename)) throw SMETException("Invalid file name \""+filename+"\"", AT);
	errno = 0;
602
	std::ofstream fout;
603
	fout.open(filename.c_str(), ios::binary);
604
	if (fout.fail()) {
605
		ostringstream ss;
606
		ss << "Error opening file \"" << filename << "\" for writing, possible reason: " << strerror(errno);
607
608
		throw SMETException(ss.str(), SMET_AT);
	}
609

610
	write_header(fout); //Write the header info, always in ASCII format
611
612

	if (nr_of_fields == 0){
613
		fout.close();
614
615
616
		return;
	}

617
	const size_t nr_of_lines = data.size() / nr_of_fields;
618
619
	if ((data.size() % nr_of_fields) != 0) {
		fout.close();
620
		throw SMETException("Inconsistency between data and header fields detected in file \""+filename+"\", recheck your data", SMET_AT);
621
	}
622

623
	std::vector<double> current_data(nr_of_fields);
624
625
626
627
	check_formatting();

	if (smet_type == ASCII){
		for (size_t ii=0; ii<nr_of_lines; ii++){
628
			if (!data.empty())
629
				copy(data.begin()+ii*nr_of_fields, data.begin()+ii*nr_of_fields+nr_of_fields, current_data.begin());
630
			write_data_line_ascii("0000-01-01T00:00", current_data, fout); //dummy time
631
632
633
		}
	} else {
		for (size_t ii=0; ii<nr_of_lines; ii++){
634
			if (!data.empty())
635
				copy(data.begin()+ii*nr_of_fields, data.begin()+ii*nr_of_fields+nr_of_fields, current_data.begin());
636
			write_data_line_binary(current_data, fout);
637
		}
638

639
640
641
		file_is_binary = false;
	}

642
	fout.close();
643
644
}

645
void SMETWriter::write_header(std::ofstream& fout)
646
{
647
648
	if (!valid_header()) {
		fout.close();
649
		throw SMETException("The header data you supplied is not valid, file \""+filename+"\" cannot be written", SMET_AT);
650
	}
651

652
653
654
655
	//write signature
	fout << "SMET " << SMETCommon::smet_version << " ";
	if (smet_type == ASCII) fout << "ASCII" << "\n";
	else fout << "BINARY" << "\n";
656

657
	fout << "[HEADER]" << "\n";
658
	fout << "station_id       = " << header["station_id"] << "\n";
659

660
	map<string,string>::const_iterator it = header.find("station_name");
661
	if (it != header.end())
662
		fout << "station_name     = " << it->second << "\n";
663
664
665

	if (location_in_header){
		if (location_wgs84 == 7){
666
667
668
			fout << "latitude         = " << header["latitude"]  << "\n";
			fout << "longitude        = " << header["longitude"] << "\n";
			fout << "altitude         = " << header["altitude"]  << "\n";
669
670
671
		}

		if (location_epsg == 15){
672
673
			fout << "easting          = " << header["easting"]   << "\n";
			fout << "northing         = " << header["northing"]  << "\n";
674
			if (location_wgs84 != 7)
675
676
				fout << "altitude        = " << header["altitude"]  << "\n";
			fout << "epsg             = " << header["epsg"]  << "\n";
677
678
679
		}
	} else {
		if (location_in_data_epsg)
680
			fout << "epsg             = " << header["epsg"]      << "\n";
681
682
	}

683
	fout << "nodata           = " << header["nodata"] << "\n";
684
685
686

	//Optional header keys:
	it = header.find("tz");
687
	if (it != header.end())
688
		fout << "tz               = " << it->second << "\n";
689
690

	it = header.find("creation");
691
	if (it != header.end())
692
		fout << "creation         = " << it->second << "\n";
693
694

	it = header.find("source");
695
	if (it != header.end())
696
		fout << "source           = " << it->second << "\n";
697
698

	it = header.find("units_offset");
699
	if (it != header.end())
700
		fout << "units_offset     = " << it->second << "\n";
701
702

	it = header.find("units_multiplier");
703
	if (it != header.end())
704
		fout << "units_multiplier = " << it->second << "\n";
705
706

	it = header.find("comment");
707
	if (it != header.end())
708
		fout << "comment          = " << it->second << "\n";
709

710
	for (size_t ii=0; ii<other_header_keys.size(); ii++){
711
		fout << other_header_keys[ii] << " = " << header[other_header_keys[ii]] << "\n";
712
713
	}

714
	fout << "fields           = " << header["fields"] << "\n";
715
716
717
	fout << "[DATA]" << endl;
}

718
void SMETWriter::write_data_line_binary(const std::vector<double>& data, std::ofstream& fout)
719
720
721
722
723
{
	const char eoln = '\n';

	if (!file_is_binary){ //open it as binary file
		fout.close();
724
		errno = 0;
725
		fout.open(filename.c_str(), ios::out | ios::app | ios::binary); //reopen as binary file
726
		if (fout.fail()) {
727
			ostringstream ss;
728
729
730
			ss << "Error writing to file \"" << filename << "\", possible reason: " << strerror(errno);
			throw SMETException(ss.str(), SMET_AT);
		}
731
732
733
734
735
736

		file_is_binary = true;
	}

	for (size_t ii = 0; ii < data.size(); ii++){
		if (julian_present && (julian_field == ii)){
737
			const double julian = data[ii];
738
739
			fout.write((char*)&julian, sizeof(double)); //the julian date is written in 64bit IEEE754 precision
		} else {
740
			const float val = (float)data[ii];
741
742
743
744
745
746
747
			fout.write((char*)&val, sizeof(float)); //normal data fields are written in 32bit IEEE754 precision
		}
	}

	fout.write((char*)&eoln, sizeof(char));
}

748
void SMETWriter::write_data_line_ascii(const std::string& timestamp, const std::vector<double>& data, std::ofstream& fout)
749
750
751
752
753
{
	fout.fill(' ');
	fout << right;
	fout << fixed;

754
	if ((data.empty()) && timestamp_present) fout << timestamp;
755
756
757
758
759
760
761
762
763

	for (size_t ii = 0; ii < data.size(); ii++){
		if (ii > 0) fout << " ";
		if (timestamp_present && (timestamp_field == ii))	fout << timestamp << " ";

		fout << setw(ascii_width[ii]) << setprecision(ascii_precision[ii]);
		if (data[ii] == nodata_value) fout << nodata_string; //to have a nicer representation
		else fout << data[ii];
	}
764
	fout << "\n";
765
766
767
768
}

void SMETWriter::check_formatting()
{
769
	const size_t nr_of_data_fields = (timestamp_present)? nr_of_fields-1 : nr_of_fields;
770
771
772
773
774
775
776
777
778
779
780
781

	if ((ascii_precision.size() != nr_of_data_fields) || (ascii_width.size() != nr_of_data_fields)){
		ascii_precision.resize(nr_of_data_fields, 3);
		ascii_width.resize(nr_of_data_fields, 8);
	}

	if (julian_present){
		ascii_precision[julian_field] = 8;
		ascii_width[julian_field] = 16;
	}
}

782
void SMETWriter::set_width(const std::vector<int>& vec_width)
783
784
785
786
{
	ascii_width = vec_width;
}

787
void SMETWriter::set_precision(const std::vector<int>& vec_precision)
788
789
790
791
{
	ascii_precision = vec_precision;
}

792
793
794

////////////////////////////////////////////////////////////
//// SMETReader class
795
796
const size_t SMETReader::streampos_every_n_lines = 2000; //save streampos every 2000 lines of data

797
798
799
800
801
802
803
804
805
806
807
SMETReader::SMETReader(const std::string& in_fname)
            : data_start_fpointer(), vec_offset(), vec_multiplier(), vec_fieldnames(),
              header(), indexer(),
              filename(in_fname), timestamp_start("-4714-11-24T00:00"),
              timestamp_end("9999-12-31T00:00"), nodata_value(-999.),
              julian_start(0.), julian_end(5373483.5),
              nr_of_fields(0), timestamp_field(0), julian_field(0),
              location_wgs84(0), location_epsg(0), location_data_wgs84(0), location_data_epsg(0),
              eoln('\n'),
              timestamp_present(false), julian_present(false), isAscii(true), mksa(true),
              timestamp_interval(false), julian_interval(false)
808
809
{
	std::ifstream fin; //Input file streams
810
	if (!SMETCommon::fileExists(filename)) throw SMETException("File '"+filename+"' does not exists", AT); //prevent invalid filenames
811
	errno = 0;
812
	fin.open (filename.c_str(), ios::in|ios::binary); //ascii does end of line translation, which messes up the pointer code
813
	if (fin.fail()) {
814
		ostringstream ss;
815
		ss << "Error opening file \"" << filename << "\" for reading, possible reason: " << strerror(errno);
816
817
818
		ss << " Please check file existence and permissions!";
		throw SMETException(ss.str(), SMET_AT);
	}
819
820
821
822
823
824
825
826
827
828
829
830

	try {
		eoln = SMETCommon::getEoln(fin); //get the end of line character for the file
		read_header(fin);
		process_header();
	} catch(...){
		cleanup(fin); //closes file
		throw;
	}
	cleanup(fin); //closes file
}

831
SMETReader::~SMETReader() {}
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846

void SMETReader::cleanup(std::ifstream& fin) throw()
{
	if (fin.is_open()) //close fin if open
		fin.close();
}

void SMETReader::convert_to_MKSA(const bool& in_mksa)
{
	mksa = in_mksa;
}

std::string SMETReader::get_field_name(const size_t& nr_of_field)
{
	if (nr_of_field < nr_of_fields){
847
		return vec_fieldnames[nr_of_field];
848
	} else {
849
		ostringstream ss;
850
851
852
		ss << "Trying to access field #" << nr_of_field << " (starting from 0) of " << nr_of_fields << " fields in file \"" << filename << "\". ";
		ss << "This is out of bounds!";
		throw SMETException(ss.str(), SMET_AT);
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
	}
}

size_t SMETReader::get_nr_of_fields() const
{
	return nr_of_fields;
}

void SMETReader::get_units_conversion(std::vector<double>& offset, std::vector<double>& multiplier) const
{
	multiplier = vec_multiplier;
	offset = vec_offset;
}

bool SMETReader::location_in_header(const LocationType& type) const
{
	if ((location_epsg == 15) && (type == EPSG)){
		return true;
	} else if ((location_wgs84 == 7) && (type == WGS84)){
		return true;
	}

	return false;
}

bool SMETReader::location_in_data(const LocationType& type) const
{
	if ((location_epsg == 8) && (location_data_epsg == 7) && (type == EPSG)){
		return true;
	} else if ((location_data_wgs84 == 7) && (type == WGS84)){
		return true;
	}

	return false;
}

void SMETReader::process_header()
{
	vector<string> tmp_vec;
	set<string> obligatory_keys;
893
	for (map<string,string>::iterator it = header.begin(); it != header.end(); ++it){
894
895
		if (SMETCommon::all_mandatory_header_keys.find(it->first) != SMETCommon::all_mandatory_header_keys.end())
			obligatory_keys.insert(it->first);
896

897
898
		if (it->first == "fields"){
			SMETCommon::readLineToVec(it->second, tmp_vec);
899
			string newfields;
900
			if (!tmp_vec.empty()){
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
				for (size_t ii=0; ii<tmp_vec.size(); ii++){
					if (tmp_vec[ii] == "timestamp"){
						timestamp_present = true;
						timestamp_field = ii;
					} else {
						if (nr_of_fields > 0) newfields += " ";
						vec_fieldnames.push_back(tmp_vec[ii]);
						newfields += tmp_vec[ii];
						nr_of_fields++;
					}

					if (tmp_vec[ii] == "julian"){
						julian_present = true;
						julian_field = ii;
					}
916

917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
					//Using WGS_84 coordinate system
					if (tmp_vec[ii] == "latitude")  location_data_wgs84 |= 1;
					else if (tmp_vec[ii] == "longitude") location_data_wgs84 |= 2;
					else if (tmp_vec[ii] == "altitude")  location_data_wgs84 |= 4;

					//Using an EPSG coordinate system
					if (tmp_vec[ii] == "easting")  location_data_epsg |= 1;
					else if (tmp_vec[ii] == "northing") location_data_epsg |= 2;
					else if (tmp_vec[ii] == "altitude") location_data_epsg |= 4;
				}
				it->second = newfields;
			}
		}

		if (it->first == "nodata")
			nodata_value = SMETCommon::convert_to_double(it->second);

		//Using WGS_84 coordinate system
		if (it->first == "latitude")  location_wgs84 |= 1;
		else if (it->first == "longitude") location_wgs84 |= 2;
		else if (it->first == "altitude")  location_wgs84 |= 4;

		//Using an EPSG coordinate system
		if (it->first == "easting")  location_epsg |= 1;
		else if (it->first == "northing") location_epsg |= 2;
		else if (it->first == "altitude") location_epsg |= 4;
		else if (it->first == "epsg")     location_epsg |= 8;

945
946
947
		//Now do a value check on EPSG
		if (it->first == "epsg")
			SMETCommon::convert_to_int(it->second);
948
949
950
951
	}

	if (get_header_value("units_offset") != ""){
		vector<string> tmp_offset;
952
		string offsetstring;
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
		SMETCommon::readLineToVec(get_header_value("units_offset"), tmp_offset);

		for (size_t ii=0; ii<tmp_offset.size(); ii++){
			if (!timestamp_present || (ii != timestamp_field)){
				if (ii>0) offsetstring += " ";
				offsetstring += tmp_offset[ii];
				vec_offset.push_back(SMETCommon::convert_to_double(tmp_offset[ii]));
			}
		}
		header["units_offset"] = offsetstring;
	} else {
		vec_offset.resize(nr_of_fields, 0.0);
	}

	if (get_header_value("units_multiplier") != ""){
		vector<string> tmp_multiplier;
969
		string multiplierstring;
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
		SMETCommon::readLineToVec(get_header_value("units_multiplier"), tmp_multiplier);

		for (size_t ii=0; ii<tmp_multiplier.size(); ii++){
			if (!timestamp_present || (ii != timestamp_field)){
				if (ii>0) multiplierstring += " ";
				multiplierstring += tmp_multiplier[ii];
				vec_multiplier.push_back(SMETCommon::convert_to_double(tmp_multiplier[ii]));
			}
		}
		header["units_multiplier"] = multiplierstring;
	} else {
		vec_multiplier.resize(nr_of_fields, 1.0);
	}

	if (obligatory_keys.size() != SMETCommon::all_mandatory_header_keys.size())
985
		throw SMETException("\""+filename+"\" is not a valid SMET file, mandatory information in header is missing", SMET_AT);
986

987
	if ((location_wgs84 == 7) || (location_epsg == 15) || (location_data_wgs84 == 7)
988
989
990
	    || ((location_epsg == 8) && (location_data_epsg == 7))){
		//location info present somewhere
	} else {
991
		throw SMETException("\""+filename+"\" is not a valid SMET file, mandatory location info is missing (header and data)", SMET_AT);
992
	}
993
994
995

	const size_t nr_offset = vec_offset.size();
	const size_t nr_multiplier = vec_multiplier.size();
996
997
998
999
	if (nr_offset!=nr_of_fields || nr_multiplier!=nr_of_fields) {
		const size_t Nfields = (timestamp_present)? nr_of_fields+1 : nr_of_fields;
		const size_t Noffset = (timestamp_present)? nr_offset+1 : nr_offset;
		const size_t Nmultiplier =(timestamp_present)? nr_multiplier+1 : nr_multiplier;
1000
		std::ostringstream ss;