disk-cleaner 0.1.3

A disk usage cli similar to windirstat
Documentation 
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#![cfg(windows)]

use std::error::Error;
use std::io;
use std::iter::once;
use std::os::windows::ffi::OsStrExt;
use std::path::Path;
use winapi::shared::winerror::NO_ERROR;
use winapi::um::errhandlingapi::GetLastError;
use winapi::um::fileapi::GetCompressedFileSizeW;
use winapi::um::fileapi::INVALID_FILE_SIZE;

pub fn compressed_size(path: &Path) -> Result<u64, Box<dyn Error>> {
    let wide: Vec<u16> = path.as_os_str().encode_wide().chain(once(0)).collect();
    let mut high: u32 = 0;

    // TODO: Deal with max path size
    let low = unsafe { GetCompressedFileSizeW(wide.as_ptr(), &mut high) };

    if low == INVALID_FILE_SIZE {
        let err = get_last_error();
        if err != NO_ERROR {
            return Err(io::Error::last_os_error().into());
        }
    }

    Ok(u64::from(high) << 32 | u64::from(low))
}

fn get_last_error() -> u32 {
    unsafe { GetLastError() }
}