71 lines
1.9 KiB
Rust
71 lines
1.9 KiB
Rust
use rand::Rng;
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use crate::address::Address;
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use crate::address::MEM_SIZE;
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pub struct Memory([u8; MEM_SIZE as usize]);
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impl Default for Memory {
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fn default() -> Self { Self([0u8; MEM_SIZE as usize]) }
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}
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impl<R: Rng> From<R> for Memory {
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fn from(mut rng: R) -> Self {
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let mut mem = Memory::default();
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for i in 0..(MEM_SIZE - 1) {
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mem.0[i as usize] = rng.gen()
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}
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mem
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}
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}
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impl std::ops::Index<Address> for Memory {
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type Output = u8;
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fn index(&self, index: Address) -> &Self::Output { &self.0[usize::from(index)] }
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}
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impl std::ops::IndexMut<Address> for Memory {
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fn index_mut(&mut self, index: Address) -> &mut Self::Output { &mut self.0[usize::from(index)] }
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}
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pub trait PeekPoke {
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fn peek<A: Into<Address>>(&self, addr: A) -> u8;
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fn poke<A: Into<Address>>(&mut self, addr: A, val: u8);
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fn peek24<A: Into<Address>>(&self, addr: A) -> u32 {
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let addr = addr.into();
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(self.peek(addr) as u32) | ((self.peek(addr + 1) as u32) << 8) | ((self.peek(addr + 2) as u32) << 16)
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}
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fn poke24<A: Into<Address>>(&mut self, addr: A, val: u32) {
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let addr = addr.into();
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self.poke(addr, val as u8);
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self.poke(addr + 1, (val >> 8) as u8);
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self.poke(addr + 2, (val >> 16) as u8);
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}
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}
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impl PeekPoke for Memory {
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fn peek<A: Into<Address>>(&self, addr: A) -> u8 { self[addr.into()] }
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fn poke<A: Into<Address>>(&mut self, addr: A, val: u8) { self[addr.into()] = val; }
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}
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#[test]
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fn test_mem_peek_poke() {
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let mut mem = Memory::default();
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assert_eq!(mem.peek(35), 0);
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mem.poke(35, 45);
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assert_eq!(mem.peek(35), 45);
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assert_eq!(mem.peek(36), 0);
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}
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#[test]
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fn test_mem_word_fns() {
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let mut mem = Memory::default();
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mem.poke24(10, 0x123456);
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assert_eq!(mem.peek(10), 0x56);
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assert_eq!(mem.peek(11), 0x34);
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assert_eq!(mem.peek(12), 0x12);
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assert_eq!(mem.peek24(10), 0x123456);
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assert_eq!(mem.peek24(11), 0x001234);
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}
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