Add windows os support

[jonathanmorley]

No description provided.

[iddm]

Although this PR heads towards a good goal, it needs some changes before merging.

[iddm]

I have used PAGE_SIZE especially because it is good for performance to read memory in size multiple to page size. That is why I used it. Windows has also page size parameter, and almost every OS has it actually. It is also possible to read it in windows. As for the rust language, the function to take this constant is probably is defined either in libc crate or winapi crate, I don't know. What's more important, removing the constant as you did here simply will not work: we must allocate some memory to read into later in the line:

while let Ok(read_bytes) = file.read(&mut buffer) {

As we did not allocate anything in the vector above, our vector size is zero and so we will try to read 0 bytes from the file and it will last forever. You may try doing this in a simple example:

fn main() {
    use std::io::Read;

    let mut f = std::fs::File::open("r.rs").unwrap();
    let mut buf = vec![];

    while let Ok(read_bytes) = f.read(&mut buf) {
        println!("Read bytes len: {}", read_bytes);
    }
}

A good PR would be to get PAGE_SIZE in windows as well as we did for unix. Could you do it please?

[iddm]

https://docs.rs/winapi/*/x86_64-pc-windows-msvc/winapi/um/psapi/struct.PERFORMANCE_INFORMATION.html#structfield.PageSize

Here it is