Catching binary file not existing

[ruairimoran]

Problem

The program hangs if you attempt to parse a binary file that does not exist.

Solution

Line 611: if (!file.is_open()) { throw std::invalid_argument("the file you provided does not exist"); } needs repeated after line 657

Caution

Worth mentioning text or binary in these error messages, so you know what the code thinks it's looking for.