binary.h
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#ifndef RTS_BINARY_H
#define RTS_BINARY_H
#include "../envi/envi.h"
#include <fstream>
#include <sys/stat.h>
namespace rts{
//This class contains a bunch of functions useful for multidimensional binary file access
template< typename T, unsigned int D = 3 >
class binary{
protected:
std::fstream file; //file stream used for reading and writing
std::string name; //file name
unsigned int R[D]; //resolution
unsigned int header; //header size (in bytes)
//basic initialization
void init(){
memset(R, 0, sizeof(unsigned int) * D); //initialize the resolution to zero
header = 0; //initialize the header size to zero
}
//returns the file size
// reads the file size from disk and returns it (in bytes)
unsigned int get_file_size(){
struct stat results;
if(stat(name.c_str(), &results) == 0)
return results.st_size;
else return 0;
}
//make sure that the specified file size matches the file size on disk
// returns true/false
bool test_file_size(){
unsigned int sum = header; //initialize the sum (in bytes) to the header size
for(unsigned int i = 0; i<D; i++) //iterate over each dimension, summing the byte size
sum += R[i] * sizeof(T);
if(sum == get_file_size()) return true; //if the byte size matches the file size, we're golden
else return false; //otherwise return an error
}
//open the file specified in "name" for binary reading and writing
bool open_file(std::string filename){
//open the file as binary for reading and writing
file.open(filename.c_str(), std::ios::in | std::ios::out | std::ios::binary);
//if the file is successful
if(file){
name = filename; //set the name
if(test_file_size()) //test the file size
return true;
}
return false;
}
public:
//open a file, given the file name, resolution (as a vector) and header size
bool open(std::string filename, vec<unsigned int, D> r, unsigned int h = 0){
if(!open_file(filename)) return false;
for(unsigned int i = 0; i < D; i++)
R[i] = r[i];
header = h;
return test_file_size();
}
/*bool open(std::string filename, unsigned int X, unsigned int h = 0){
return open(filename, vec<unsigned int, 1>(X), h);
}
bool open(std::string filename, unsigned int X, unsigned int Y, unsigned int h = 0){
return open(filename, vec<unsigned int, 2>(X, Y), h);
}
bool open(std::string filename, unsigned int X, unsigned int Y, unsigned int Z, unsigned int h = 0){
return open(filename, vec<unsigned int, 3>(X, Y, Z), h);
}*/
};
}
#endif