Javascript binary file reading

Question

From here:

_shl: function (a, b){
        for (++b; --b; a = ((a %= 0x7fffffff + 1) & 0x40000000) == 0x40000000 ? a * 2 : (a - 0x40000000) * 2 + 0x7fffff         


        

Answer 1

I found this one and it is very well documented: https://github.com/vjeux/jParser