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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;
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		ss << "Trying to append " << vecFields.size() << " fields in existing file '" << filename << "' that has " << nr_of_fields << " fields";
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		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;
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			ss << "Trying to append field '" << vecFields[ii] << "' at position " << ii << " in existing file '" << filename << "' when it should be '" << reader.get_field_name(ii);
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			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 (!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;
		}
541
		fout.open(filename.c_str(), ios::binary | ofstream::app);
542
	} else { //normal mode
543
544
545
546
547
		if (!append_possible) { //first write -> overwrite potential previous content
			fout.open(filename.c_str(), ios::binary);
			append_possible = true;
		} else //after the first write: append
			fout.open(filename.c_str(), ios::binary | ofstream::app);
548
	}
549
	
550
	if (fout.fail()) {
551
		ostringstream ss;
552
		ss << "Error opening file \"" << filename << "\" for writing, possible reason: " << strerror(errno);
553
554
		throw SMETException(ss.str(), SMET_AT);
	}
555

556
	if (!append_mode) write_header(fout); //Write the header info, always in ASCII format
557
558
	
	if (vec_timestamp.empty() || data.empty() || nr_of_fields == 0) {//the header has been written, nothing to add
559
		fout.close();
560
561
562
		return;
	}

563
564
	if (!timestamp_present) {
		fout.close();
565
		throw SMETException("No timestamp present when writing file \""+filename+"\", use write(const vector<double>& data)", SMET_AT);
566
	}
567
568

	const size_t nr_of_data_fields = nr_of_fields - 1;
569
	if (nr_of_fields<=1) { //avoid division by zero in the next block
570
		cerr << "[W] Attempting to write a dataset that contains no fields to file \"" + filename + "\"!\n";
571
		fout.close();
572
		return;
573
	}
574

575
	const size_t nr_of_lines = data.size() / (nr_of_fields-1);
576
577
	if ((nr_of_lines != vec_timestamp.size()) || ((data.size() % (nr_of_fields-1)) != 0)) {
		fout.close();
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579
580
		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);
581
	}
582

583
	std::vector<double> current_data(nr_of_fields-1);
584
585
	check_formatting();

586
587
	if (smet_type == ASCII) {
		for (size_t ii=0; ii<nr_of_lines; ii++) {
588
			const size_t offset = ii*(nr_of_fields-1);
589
			if (!data.empty())
590
				copy(data.begin()+offset, data.begin()+offset+nr_of_data_fields, current_data.begin());
591
			write_data_line_ascii(vec_timestamp[ii], current_data, fout);
592
593
		}
	} else {
594
		fout.close();
595
		throw SMETException("Cannot write binary file \""+filename+"\" with a timestamp, use julian instead", SMET_AT);
596
597
	}

598
	fout.close();
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600
601
602
}

void SMETWriter::write(const std::vector<double>& data)
{
603
604
	if (!SMETCommon::validFileAndPath(filename)) throw SMETException("Invalid file name \""+filename+"\"", AT);
	errno = 0;
605
	std::ofstream fout;
606
	fout.open(filename.c_str(), ios::binary);
607
	if (fout.fail()) {
608
		ostringstream ss;
609
		ss << "Error opening file \"" << filename << "\" for writing, possible reason: " << strerror(errno);
610
611
		throw SMETException(ss.str(), SMET_AT);
	}
612

613
	write_header(fout); //Write the header info, always in ASCII format
614
615

	if (nr_of_fields == 0){
616
		fout.close();
617
618
619
		return;
	}

620
	const size_t nr_of_lines = data.size() / nr_of_fields;
621
622
	if ((data.size() % nr_of_fields) != 0) {
		fout.close();
623
		throw SMETException("Inconsistency between data and header fields detected in file \""+filename+"\", recheck your data", SMET_AT);
624
	}
625

626
	std::vector<double> current_data(nr_of_fields);
627
628
629
630
	check_formatting();

	if (smet_type == ASCII){
		for (size_t ii=0; ii<nr_of_lines; ii++){
631
			if (!data.empty())
632
				copy(data.begin()+ii*nr_of_fields, data.begin()+ii*nr_of_fields+nr_of_fields, current_data.begin());
633
			write_data_line_ascii("0000-01-01T00:00", current_data, fout); //dummy time
634
635
636
		}
	} else {
		for (size_t ii=0; ii<nr_of_lines; ii++){
637
			if (!data.empty())
638
				copy(data.begin()+ii*nr_of_fields, data.begin()+ii*nr_of_fields+nr_of_fields, current_data.begin());
639
			write_data_line_binary(current_data, fout);
640
		}
641

642
643
644
		file_is_binary = false;
	}

645
	fout.close();
646
647
}

648
void SMETWriter::write_header(std::ofstream& fout)
649
{
650
651
	if (!valid_header()) {
		fout.close();
652
		throw SMETException("The header data you supplied is not valid, file \""+filename+"\" cannot be written", SMET_AT);
653
	}
654

655
656
657
658
	//write signature
	fout << "SMET " << SMETCommon::smet_version << " ";
	if (smet_type == ASCII) fout << "ASCII" << "\n";
	else fout << "BINARY" << "\n";
659

660
	fout << "[HEADER]" << "\n";
661
	fout << "station_id       = " << header["station_id"] << "\n";
662

663
	map<string,string>::const_iterator it = header.find("station_name");
664
	if (it != header.end())
665
		fout << "station_name     = " << it->second << "\n";
666
667
668

	if (location_in_header){
		if (location_wgs84 == 7){
669
670
671
			fout << "latitude         = " << header["latitude"]  << "\n";
			fout << "longitude        = " << header["longitude"] << "\n";
			fout << "altitude         = " << header["altitude"]  << "\n";
672
673
674
		}

		if (location_epsg == 15){
675
676
			fout << "easting          = " << header["easting"]   << "\n";
			fout << "northing         = " << header["northing"]  << "\n";
677
			if (location_wgs84 != 7)
678
679
				fout << "altitude        = " << header["altitude"]  << "\n";
			fout << "epsg             = " << header["epsg"]  << "\n";
680
681
682
		}
	} else {
		if (location_in_data_epsg)
683
			fout << "epsg             = " << header["epsg"]      << "\n";
684
685
	}

686
	fout << "nodata           = " << header["nodata"] << "\n";
687
688
689

	//Optional header keys:
	it = header.find("tz");
690
	if (it != header.end())
691
		fout << "tz               = " << it->second << "\n";
692
693

	it = header.find("creation");
694
	if (it != header.end())
695
		fout << "creation         = " << it->second << "\n";
696
697

	it = header.find("source");
698
	if (it != header.end())
699
		fout << "source           = " << it->second << "\n";
700
701

	it = header.find("units_offset");
702
	if (it != header.end())
703
		fout << "units_offset     = " << it->second << "\n";
704
705

	it = header.find("units_multiplier");
706
	if (it != header.end())
707
		fout << "units_multiplier = " << it->second << "\n";
708
709

	it = header.find("comment");
710
	if (it != header.end())
711
		fout << "comment          = " << it->second << "\n";
712

713
	for (size_t ii=0; ii<other_header_keys.size(); ii++){
714
		fout << other_header_keys[ii] << " = " << header[other_header_keys[ii]] << "\n";
715
716
	}

717
	fout << "fields           = " << header["fields"] << "\n";
718
719
720
	fout << "[DATA]" << endl;
}

721
void SMETWriter::write_data_line_binary(const std::vector<double>& data, std::ofstream& fout)
722
723
724
725
726
{
	const char eoln = '\n';

	if (!file_is_binary){ //open it as binary file
		fout.close();
727
		errno = 0;
728
		fout.open(filename.c_str(), ios::out | ios::app | ios::binary); //reopen as binary file
729
		if (fout.fail()) {
730
			ostringstream ss;
731
732
733
			ss << "Error writing to file \"" << filename << "\", possible reason: " << strerror(errno);
			throw SMETException(ss.str(), SMET_AT);
		}
734
735
736
737
738
739

		file_is_binary = true;
	}

	for (size_t ii = 0; ii < data.size(); ii++){
		if (julian_present && (julian_field == ii)){
740
			const double julian = data[ii];
741
742
			fout.write((char*)&julian, sizeof(double)); //the julian date is written in 64bit IEEE754 precision
		} else {
743
			const float val = (float)data[ii];
744
745
746
747
748
749
750
			fout.write((char*)&val, sizeof(float)); //normal data fields are written in 32bit IEEE754 precision
		}
	}

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

751
void SMETWriter::write_data_line_ascii(const std::string& timestamp, const std::vector<double>& data, std::ofstream& fout)
752
753
754
755
756
{
	fout.fill(' ');
	fout << right;
	fout << fixed;

757
	if ((data.empty()) && timestamp_present) fout << timestamp;
758
759
760
761
762
763
764
765
766

	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];
	}
767
	fout << "\n";
768
769
770
771
}

void SMETWriter::check_formatting()
{
772
	const size_t nr_of_data_fields = (timestamp_present)? nr_of_fields-1 : nr_of_fields;
773
774
775
776
777
778
779
780
781
782
783
784

	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;
	}
}

785
void SMETWriter::set_width(const std::vector<int>& vec_width)
786
787
788
789
{
	ascii_width = vec_width;
}

790
void SMETWriter::set_precision(const std::vector<int>& vec_precision)
791
792
793
794
{
	ascii_precision = vec_precision;
}

795
796
797

////////////////////////////////////////////////////////////
//// SMETReader class
798
799
const size_t SMETReader::streampos_every_n_lines = 2000; //save streampos every 2000 lines of data

800
801
802
803
804
805
806
807
808
809
810
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)
811
812
{
	std::ifstream fin; //Input file streams
813
	if (!SMETCommon::fileExists(filename)) throw SMETException("File '"+filename+"' does not exists", AT); //prevent invalid filenames
814
	errno = 0;
815
	fin.open (filename.c_str(), ios::in|ios::binary); //ascii does end of line translation, which messes up the pointer code
816
	if (fin.fail()) {
817
		ostringstream ss;
818
		ss << "Error opening file \"" << filename << "\" for reading, possible reason: " << strerror(errno);
819
820
821
		ss << " Please check file existence and permissions!";
		throw SMETException(ss.str(), SMET_AT);
	}
822
823
824
825
826
827
828
829
830
831
832
833

	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
}

834
SMETReader::~SMETReader() {}
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849

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){
850
		return vec_fieldnames[nr_of_field];
851
	} else {
852
		ostringstream ss;
853
854
855
		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);
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
893
894
895
	}
}

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;
896
	for (map<string,string>::iterator it = header.begin(); it != header.end(); ++it){
897
898
		if (SMETCommon::all_mandatory_header_keys.find(it->first) != SMETCommon::all_mandatory_header_keys.end())
			obligatory_keys.insert(it->first);
899

900
901
		if (it->first == "fields"){
			SMETCommon::readLineToVec(it->second, tmp_vec);
902
			string newfields;
903
			if (!tmp_vec.empty()){
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
				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;
					}
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
945
946
947
					//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;

948
949
950
		//Now do a value check on EPSG
		if (it->first == "epsg")
			SMETCommon::convert_to_int(it->second);
951
952
953
954
	}

	if (get_header_value("units_offset") != ""){
		vector<string> tmp_offset;
955
		string offsetstring;
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
		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;
972
		string multiplierstring;
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
		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())
988
		throw SMETException("\""+filename+"\" is not a valid SMET file, mandatory information in header is missing", SMET_AT);
989

990
991
992
993
994
995
996
997
998
999
1000
	const bool location_meta_present = (location_wgs84 == 7) || (location_epsg == 15) || (location_data_wgs84 == 7)
	    || ((location_epsg == 8) && (location_data_epsg == 7));
	if (!location_meta_present) {
		ostringstream ss;
		ss << "Mandatory location data is missing in file '" << filename << "'";
		std::string missing;
		if ((location_epsg>0 && !(location_epsg & 4)) || (location_wgs84>0 && !(location_wgs84 & 4))) //altitude meta is missing
			missing += "altitude";
		if (location_epsg>0 && location_epsg<8) {//epsg meta is missing
			if (!missing.empty()) missing += ", ";
			missing += "epsg";