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extraction.cpp
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extraction.cpp
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#include <bits/stdc++.h>
using namespace std;
void extract()
{
//int extension=get_filename(filepath);
int parity_index=0,n=5;
string filepath="/home/rohit/Dropbox/raid/extracted_files/f";
string source_filepath1="/home/rohit/Dropbox/raid/raid_files/f1";
string source_filepath2="/home/rohit/Dropbox/raid/raid_files/f2";
string source_filepath3="/home/rohit/Dropbox/raid/raid_files/f3";
string source_filepath4="/home/rohit/Dropbox/raid/raid_files/f4";
string source_filepath5="/home/rohit/Dropbox/raid/raid_files/f5";
FILE *fp = fopen(filepath.c_str(),"wb");
FILE *f1 = fopen(source_filepath1.c_str(),"rb");
FILE *f2 = fopen(source_filepath2.c_str(),"rb");
FILE *f3 = fopen(source_filepath3.c_str(),"rb");
FILE *f4 = fopen(source_filepath4.c_str(),"rb");
FILE *f5 = fopen(source_filepath5.c_str(),"rb");
if(fp==NULL || f1==NULL ||f2==NULL ||f3==NULL ||f4==NULL ||f5==NULL )
{
printf("File open error");
return;
}
//cout<<endl;
cout<<"starting extraction..."<<endl;
while(1)
{
unsigned char buff[4]={0},temp;
int j=0,flag=0;
for(int i=0;i<n && flag==0;i++)
{
//cout<<"for loop for "<<i<<endl;
switch(i)
{
case 0:if(i==parity_index)
{
fread(&temp,1,1,f1);
}
else
{
int nread=fread(buff+j,1,1,f1);
j++;
if(nread<=0)
flag=1;
//cout<<"file "<<i<<" buff "<<j<<": "<<buff[j-1]<<endl;
}
break;
case 1:if(i==parity_index)
{
fread(&temp,1,1,f2);
}
else
{
int nread=fread(buff+j,1,1,f2);
j++;
if(nread<=0)
flag=1;
//cout<<"file "<<i<<" buff "<<j<<": "<<buff[j-1]<<endl;
}
break;
case 2:if(i==parity_index)
{
fread(&temp,1,1,f3);
}
else
{
int nread=fread(buff+j,1,1,f3);
j++;
if(nread<=0)
flag=1;
//cout<<"file "<<i<<" buff "<<j<<": "<<buff[j-1]<<endl;
}
break;
case 3:if(i==parity_index)
{
fread(&temp,1,1,f4);
}
else
{
int nread=fread(buff+j,1,1,f4);
j++;
if(nread<=0)
flag=1;
//cout<<"file "<<i<<" buff "<<j<<": "<<buff[j-1]<<endl;
}
break;
case 4:if(i==parity_index)
{
fread(&temp,1,1,f5);
}
else
{
int nread=fread(buff+j,1,1,f5);
j++;
if(nread<=0)
flag=1;
//cout<<"file "<<i<<" buff "<<j<<": "<<buff[j-1]<<endl;
}
break;
default:break;
}
}
if(flag==0)
fwrite(buff,1,4,fp);
else
{
j--;
if(j!=0)
fwrite(buff,1,j,fp);
break;
}
parity_index=(parity_index+1)%n;
/*
if (nread < 4)
{
if (feof(fp))
printf("file saved\n");
if (ferror(fp))
printf("Error reading\n");
break;
}
*/
}
fclose(fp);
fclose(f1);
fclose(f2);
fclose(f3);
fclose(f4);
fclose(f5);
}
int main()
{
extract();
cout<<"file extracted successfully"<<endl;
return 0;
}