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Day-082.cpp
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Day-082.cpp
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class Reader{
private:
string raw_data;
string buffer;
int processed_till;
string read7(){
int start = processed_till; // point from where we have to read the file
int end = min(processed_till+7, (int)raw_data.size());
int old_start_point = start;
processed_till = end; // updated till where file is read
// so that next time we can start from the same point
return raw_data.substr(old_start_point, end);
}
public:
Reader(const string & refString): raw_data(refString), buffer(""), processed_till(0) { }
string readN(int n) {
while (int(buffer.size()) < n) {
string get_char = read7();
if (get_char == "") { // no more characters are remaining
break;
}
buffer += get_char;
}
int end_point = min((int)buffer.size(), n);
string to_be_returned = buffer.substr(0, end_point);
if(end_point <= (int)buffer.size()){
buffer = buffer.substr(end_point, (int)buffer.size());
}
return to_be_returned;
}
};