dustbox 0.0.1

PC x86 emulator with the goal of easily running MS-DOS games on Windows, macOS and Linux.
Documentation 
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use crate::hex::hex_bytes_separated;

#[derive(Clone, Default)]
pub struct FlatMemory {
    pub data: Vec<u8>,
}

const DEBUG_MEMORY: bool = false;

impl FlatMemory {
    pub fn new() -> Self {
        FlatMemory { data: vec![0u8; 0x1_0000 * 64] }
    }

    pub fn read_u8(&self, addr: u32) -> u8 {
        let val = self.data[addr as usize];
        if DEBUG_MEMORY {
            println!("read_u8 from {:06x} = {:02x}", addr, val);
        }
        val
    }

    pub fn read_u16(&self, addr: u32) -> u16 {
        u16::from(self.read_u8(addr + 1)) << 8 | u16::from(self.read_u8(addr))
    }

    pub fn write_u8(&mut self, addr: u32, data: u8) {
        if DEBUG_MEMORY {
            println!("write_u8 to {:06x} = {:02x}", addr, data);
        }
        self.data[addr as usize] = data;
    }

    pub fn write_u16(&mut self, addr: u32, data: u16) {
        self.write_u8(addr, data as u8);
        self.write_u8(addr + 1, (data >> 8) as u8);
    }

    pub fn read_u32(&self, addr: u32) -> u32 {
        u32::from(self.read_u16(addr + 2)) << 16 | u32::from(self.read_u16(addr))
    }

    pub fn write_u32(&mut self, addr: u32, data: u32) {
        self.write_u16(addr, data as u16);
        self.write_u16(addr + 2, (data >> 16) as u16);
    }

    pub fn read(&self, addr: u32, length: usize) -> &[u8] {
        let addr = addr as usize;
        &self.data[addr..addr+length]
    }

    pub fn write(&mut self, addr: u32, data: &[u8]) {
        let addr = addr as usize;
        if DEBUG_MEMORY {
            println!("write to {:06x} in {} bytes: {}", addr, data.len(), hex_bytes_separated(data, ' '));
        }
        self.data[addr..addr+data.len()].copy_from_slice(data);
    }
}