big_binary_file.h

#pragma once
 
#include <string>
#include "lib_begin.h"
 
namespace cgv {
    namespace utils {
class CGV_API big_binary_file
{
public:
    enum MODE {READ = 1, WRITE = 2, READ_WRITE = 3};
 
private:
    MODE access_mode;
    std::string filename;
    bool fileopened;
    void* file;
public:
    
    big_binary_file(const std::string &filename = "");
    
    virtual ~big_binary_file();
    
    bool open(MODE m, const std::string& file_name = "");
    
    void close();
    
    bool is_open();
 
    long long size();
        
    bool read(unsigned char *targetbuffer,unsigned long num, unsigned long *numread=NULL);
 
    bool write(const unsigned char *sourcebuffer,unsigned long num, unsigned long *numwrote=NULL);
 
    template <typename T>
    bool read(T& v) { return read((unsigned char*)(&v),sizeof(T)); }
    template <typename T>
    bool read_array(T* a, unsigned int n) { return read((unsigned char*)a,sizeof(T)*n); }
 
    template <typename T>
    bool write(const T& v) { return write((const unsigned char*)(&v),sizeof(T)); }
    template <typename T>
    bool write_array(const T* a, unsigned int n) { return write((const unsigned char*)a,sizeof(T)*n); }
 
    //set the file pointer to index (position in bytes from the beginning of the file)
    bool seek(long long index);
    
    long long position();
};
 
    }
}
 
#include <cgv/config/lib_end.h>