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analizza_binario.cpp
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analizza_binario.cpp
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# include <iostream>
# include <fstream>
using namespace std;
void swap_endian_s(short* in_s,int n)
{
int i;
union {short smio; char arr[2];}x;
char buff;
for(i=0;i<n;i++)
{
x.smio=in_s[i];
buff=x.arr[0];
x.arr[0]=x.arr[1];
x.arr[1]=buff;
in_s[i]=x.smio;
}
}
void swap_endian_i(int* in_i,int n)
{
int i;
union {int imio; float fmio; char arr[4];}x;
char buff;
for(i=0;i<n;i++)
{
x.imio=in_i[i];
buff=x.arr[0];
x.arr[0]=x.arr[3];
x.arr[3]=buff;
buff=x.arr[1];
x.arr[1]=x.arr[2];
x.arr[2]=buff;
in_i[i]=x.imio;
}
}
void swap_endian_f(float* in_f, int n)
{
int i;
union {int imio; float fmio; char arr[4];}x;
char buff;
for(i=0;i<n;i++)
{
x.fmio=in_f[i];
buff=x.arr[0];
x.arr[0]=x.arr[3];
x.arr[3]=buff;
buff=x.arr[1];
x.arr[1]=x.arr[2];
x.arr[2]=buff;
in_f[i]=x.fmio;
}
}
int main(int narg, char ** args)
{
ifstream inputfile;
inputfile.open(args[1],ios::binary|ios::in);
union _analizza
{
float f;
int i;
} dato;
while(1)
{
int n;
inputfile.read((char *)&dato.f, 4);
if(inputfile.eof()) break;
cout << "non swappati: float = "<< dato.f << "; int = " << dato.i << endl;
swap_endian_f(&dato.f, 1);
cout << " swappati: float = "<< dato.f << "; int = " << dato.i << endl;
cin >> n;
if(n) inputfile . seekg((n-1)*sizeof(float), ios :: cur);
}
}