Question

I am using following C++ stl construct to read the file into vector of characters

std::ifstream testFile(inFileName, std::ios::binary);
std::vector<char> fileContents((std::istreambuf_iterator<char>(testFile)), std::istreambuf_iterator<char>());

But this also read \r\n into the vector.

Is there any way to avoid reading \r\n or delete after reading

Answer 1

Assuming you input file is generated on the same platform as you are reading it on.
Then you can convert the LTS (in this case it looks like ‘\r\n’) to a ‘\n’ simply by opening the file in text mode:

std::ifstream testFile(inFileName);

You can remove specific characters by using the remove_copy algorithm:

std::vector<char> fileContents;


// Copy all elements that are not '\n'
std::remove_copy(std::istreambuf_iterator<char>(testFile),   // src begin
                 std::istreambuf_iterator<char>(),           // src end
                 std::back_inserter(fileContents),           // dst begin
                '\n');                                       // element to remove

If you need to remove more than one type of character you need to create a functor and use remove_copy_if algorithm:

struct DelNLorCR
{
    bool operator()(char x) const {return x=='\n' || x=='\r';}
};
std::remove_copy_if(std::istreambuf_iterator<char>(testFile),   // src begin
                    std::istreambuf_iterator<char>(),           // src end
                    std::back_inserter(fileContents),           // dst begin
                    DelNLorCR());                               // functor describing bad characters