From b49205144878b78cf85b4dbce55259e1412125fe Mon Sep 17 00:00:00 2001
From: Dominik Maier <domenukk@gmail.com>
Date: Thu, 29 Oct 2020 12:20:47 +0100
Subject: [PATCH] initial mapfeedback

---
 src/feedbacks/mod.rs | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/src/feedbacks/mod.rs b/src/feedbacks/mod.rs
index dabeebe69a..6b95341a04 100644
--- a/src/feedbacks/mod.rs
+++ b/src/feedbacks/mod.rs
@@ -1,6 +1,41 @@
 use crate::corpus::Testcase;
 use crate::executors::Executor;
+use crate::observers::MapObserver;
 
 pub trait Feedback {
-    fn is_interesting(&mut self, executor: &dyn Executor, entry: &dyn Testcase) -> f64;
+    /// is_interesting should return the "Interestingness" from 0 to 255 (percent times 2.55)
+    fn is_interesting(&mut self, executor: &dyn Executor, entry: &dyn Testcase) -> u8;
+}
+
+use crate::observers::StaticMapObserver;
+pub struct CovFeedback<'a> {
+    virgin_bits: Vec<u8>,
+    smo: &'a StaticMapObserver,
+}
+
+impl<'a> Feedback for CovFeedback<'a> {
+    fn is_interesting(&mut self, _executor: &dyn Executor, _entry: &dyn Testcase) -> u8 {
+        let mut interesting = 0;
+        // TODO: impl. correctly, optimize
+        for (virgin, map) in self.virgin_bits.iter_mut().zip(self.smo.get_map().iter()) {
+            if virgin != map {
+                *virgin = *map;
+                if interesting < 250 {
+                    interesting += 25
+                }
+            }
+        }
+
+        interesting
+    }
+}
+
+impl<'a> CovFeedback<'a> {
+    /// Create new CovFeedback using a static map observer
+    pub fn new(smo: &'a StaticMapObserver) -> Self {
+        CovFeedback {
+            smo: smo,
+            virgin_bits: vec![0; smo.get_map().len()],
+        }
+    }
 }