/**
* Main function that demonstrates memory mapping a large file and accessing its contents.
*
* This function:
* 1. Opens a large virtual disk file (ext4.vhdx)
* 2. Creates a memory mapping of the file
* 3. Accesses the mapped content
* 4. Prints the memory address of the content and its length
*
* Returns:
* Result<(), Box<dyn std::error::Error>> - Ok on success, or an error boxed as a trait object
*/
fn main() -> Result<(), Box<dyn std::error::Error>> {
use std::fs::File;
use doe::memory_address;
use memmap2::Mmap;
// Open the virtual disk file in read-only mode
let file = File::open("D:/arch_linux/ext4.vhdx")?;
// Create a memory map of the entire file (unsafe due to potential undefined behavior)
let mmap = unsafe { Mmap::map(&file)? };
// Get a slice reference to the entire mapped memory
let content = &mmap[..];
// Print the memory address and length of the mapped content
println!("memory_address:{:?}", memory_address!(content));
println!("len:{}", content.len());
Ok(())
}
