Implement reading from real memory

src/emulator/shrooms_vb_core.rs

@@ -1,4 +1,4 @@
-use std::{ffi::c_void, ptr, slice};
+use std::{ffi::c_void, ops::Range, ptr, slice};
 
 use anyhow::{anyhow, Result};
 use bitflags::bitflags;
@@ -101,6 +101,8 @@ extern "C" {
     fn vb_get_user_data(sim: *mut VB) -> *mut c_void;
     #[link_name = "vbInit"]
     fn vb_init(sim: *mut VB) -> *mut VB;
+    #[link_name = "vbRead"]
+    fn vb_read(sim: *mut VB, address: u32, typ_: VBDataType) -> i32;
     #[link_name = "vbReset"]
     fn vb_reset(sim: *mut VB);
     #[link_name = "vbSetCartRAM"]
@@ -314,6 +316,13 @@ impl Sim {
             VBRegister::PC => unsafe { vb_get_program_counter(self.sim) },
         }
     }
+
+    pub fn read_memory(&mut self, addresses: Range<u32>, into: &mut Vec<u8>) {
+        for address in addresses {
+            let byte = unsafe { vb_read(self.sim, address, VBDataType::U8) };
+            into.push(byte as u8);
+        }
+    }
 }
 
 impl Drop for Sim {