ChrisDenton

In Windows there are essentially two types of allocations:

1. Reserve sets aside a chunk of the process' virtual memory so that it won't be used by other allocations. It does not do anything else. There are no limits to the size, except that it can't overlap other reserved or committed memory virtual memory.
2. Commit allocates an area of reserved memory. The system's total amount of committed memory must be less than physical memory plus maximum page file size. However, this memory might not be physically allocated until a page is actually written to.

ChrisDenton

MSVC Linking Overview

Basic Linking Behaviour

Object files (.obj) contain a single COFF object. Library files (.lib) are an archive containing one or more COFF objects. Be aware that the linker identifies both object files and library files by their contents, not their file extension.

Object files passed on the command line are always linked in to the binary.

When a library file is added directly on the command line then it will be searched for symbols that have not yet been found. If found in the library, the containing COFF object will be linked. Other objects in the library will not be linked unless they provide a needed symbol.

ChrisDenton

/// Turns an &[u8] into an &[u8; _]
macro_rules! try_from_slice {
    ($bytes:expr) => {{
        enum Ns {}
        impl<'a> Ns {
            const BYTES: &'a[u8] = $bytes;
        }
        type T = [u8; Ns::BYTES.len()];
        // Saftey: We know the length is in bounds.
        unsafe {

ChrisDenton

use std::fs::{self, OpenOptions};
use std::io::{self, Write};

fn main() -> io::Result<()> {
    // The directory.
    let mut dir: String = "./directory".into();
    fs::create_dir_all(&dir)?;

    // Confirm the directory is a directory.
    let is_dir = fs::metadata(&dir)?.file_type().is_dir();

ChrisDenton

/// Never create or use this struct directly.
#[repr(C)]
pub struct RenameInfoW {
	_flags: u32,
	_root_dir: *const std::ffi::c_void,
	_name_length: u32,
	_name: [u16; 1],
}
impl RenameInfoW {
	const FLAGS_OFFSET: usize = 0;

ChrisDenton

use std::fs;
use std::path::Path;
use std::io;
use std::env;
use std::ffi::OsString;
use std::os::windows::ffi::OsStringExt;

fn main() -> io::Result<()> {
	let files = [r"bar", r"\bar", r"..\bar", r".\bar", r".\", r"..\", r"\", r"D:bar"];
    let directories = [