Implement writing memory

src/gdbserver/request.rs

@@ -74,6 +74,15 @@ impl Request<'_> {
         self.buffer = self.buffer.split_at(buffer.len()).1;
         true
     }
+
+    pub fn match_bytes(&mut self, buffer: &mut [u8]) -> bool {
+        if self.buffer.len() < buffer.len() {
+            return false;
+        }
+        buffer.copy_from_slice(&self.buffer[0..buffer.len()]);
+        self.buffer = self.buffer.split_at(buffer.len()).1;
+        true
+    }
 }
 
 pub struct RequestSource<R> {