Is it possible to mmap part of the file?

I see the doc here has example of how to mmap the whole file

But say if I want to mmap bytes n to m of a file to an array, is that possible?

Do I have to use unsafe_wrap?

Optionally, you can specify an offset (in bytes) if, for example, you want to skip over a header in the file. The default value for the offset is the current stream position for an IOStream .