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use crate::block_device::{BlockDevice, BLOCK_SIZE};
use std::cell::RefCell;
#[repr(C)]
pub struct MemoryDisk {
/// Emulating a block device with a segment of RAM,
/// which is 64MiB == 4KiB per block * 16384 blocks
pub arena: RefCell<Vec<u8>>,
}
impl MemoryDisk {
pub fn new() -> Self {
Self {
arena: RefCell::new(vec![0u8; BLOCK_SIZE * 16384]),
}
}
}
impl BlockDevice for MemoryDisk {
fn read(&self, block_id: usize, buffer: &mut [u8]) {
let block_front = block_id * BLOCK_SIZE;
let block_back = block_front + BLOCK_SIZE;
let arena = self.arena.borrow();
buffer.copy_from_slice(&arena[block_front..block_back]);
}
fn write(&self, block_id: usize, buffer: &[u8]) {
let block_front = block_id * BLOCK_SIZE;
let block_back = block_front + BLOCK_SIZE;
let mut arena = self.arena.borrow_mut();
arena[block_front..block_back].copy_from_slice(buffer);
}
}
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