Split a binary file into chunks c++
- by L4nce0
I've been bashing my head against trying to first divide up a file into chunks, for the purpose of sending over sockets. I can read / write a file easily without splitting it into chunks. The code below runs, works, kinda. It will write a textfile and has a garbage character. Which if this was just for txt, no problem. Jpegs aren't working with said garbage.
Been at it for a few days, so I've done my research, and it's time to get some help. I do want to stick strictly to binary readers, as this need to handle any file.
I've seen a lot of slick examples out there. (none of them worked for me with jpgs) Mostly something along the lines of while(file)... I subscribe to the, if you know the size, use a for-loop, not a while-loop camp.
Thank you for the help!!
vector<char*> readFile(const char* fn){
vector<char*> v;
ifstream::pos_type size;
char * memblock;
ifstream file;
file.open(fn,ios::in|ios::binary|ios::ate);
if (file.is_open()) {
size = fileS(fn);
file.seekg (0, ios::beg);
int bs = size/3; // arbitrary. Actual program will use the socket send size
int ws = 0;
int i = 0;
for(i = 0; i < size; i+=bs){
if(i+bs > size)
ws = size%bs;
else
ws = bs;
memblock = new char [ws];
file.read (memblock, ws);
v.push_back(memblock);
}
}
else{
exit(-4);
}
return v;
}
int main(int argc, char **argv) {
vector<char*> v = readFile("foo.txt");
ofstream myFile ("bar.txt", ios::out | ios::binary);
for(vector<char*>::iterator it = v.begin(); it!=v.end(); ++it ){
myFile.write(*it,strlen(*it));
}
}
