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/**

 *

 * Helps to convert binary file into ascii format

 * Author: Md Bulbul Sharif

 *

 **/

#include <iostream>

#include <fstream>

#include <string>

#include <iomanip>

#include <dirent.h>

#include <cstring>

#include <sys/stat.h>

#include <gdal/gdal.h>

#include <gdal/gdal_priv.h>

#define xll 0.0

#define yll 0.0

#define cellsize 30.0

using namespace std;

typedef double value_t;

#define HEADER 2

void bin2geotiff(string input_file, string output_file){

	ifstream input(input_file.c_str(), ios::binary);

	value_t *dim_arr = new value_t[HEADER];

	input.read((char*) dim_arr, HEADER * sizeof(value_t)); 

	long nrows = (long) dim_arr[0];

	long ncols = (long) dim_arr[1];

    value_t *arr = new value_t [nrows*ncols];

	input.seekg(HEADER * sizeof(value_t), std::ios::beg);

    input.read((char*) arr, sizeof(value_t) * nrows * ncols);

    input.close();

// Register all the GDAL drivers

    GDALAllRegister();

    // Create a new GeoTIFF file with a single band

    GDALDriver *driver = GetGDALDriverManager()->GetDriverByName("GTiff");

    GDALDataset *dataset = driver->Create(output_file.c_str(), ncols, nrows, 1, GDT_Float64, NULL);

    // Set the georeferencing information (if available)

    double geotransform[6] = {xll, cellsize, 0.0, yll, 0.0, cellsize};

    dataset->SetGeoTransform(geotransform);

    // Write the data to the raster band

    GDALRasterBand *band = dataset->GetRasterBand(1);

    band->RasterIO(GF_Write, 0, 0, ncols, nrows, arr, ncols, nrows, GDT_Float64, 0, 0);

    // Clean up

    delete[] arr;

    delete[] dim_arr;

    GDALClose(dataset);

}

int main(int argc, char* argv[])

{			

	string input_dir(argv[1]);

	string output_dir(argv[2]);

	string parent_dir = output_dir.substr(0, output_dir.find_last_of("/"));

	DIR* dir_ = opendir(parent_dir.empty() ? "." : parent_dir.c_str());

	if( !dir_) {

		mkdir(parent_dir.c_str(), S_IRWXU);

	}

	else closedir(dir_);

	cout << "Converting " << input_dir << endl;

	bin2geotiff(input_dir, output_dir);

   return 0;

}