diff --git a/src/common/cpp_essentials/base_extentions/qr_formatinformation.rs b/src/common/cpp_essentials/base_extentions/qr_formatinformation.rs
index ebd87e6..4198fc8 100644
--- a/src/common/cpp_essentials/base_extentions/qr_formatinformation.rs
+++ b/src/common/cpp_essentials/base_extentions/qr_formatinformation.rs
@@ -92,8 +92,7 @@ impl FormatInformation {
     }
 
     pub fn MirrorBits(bits: u32) -> u32 {
-        todo!()
-        // return BitHacks::Reverse(bits) >> 17;
+        (bits.reverse_bits()) >> 17
     }
 
     pub fn FindBestFormatInfo(mask: u32, lookup: [[u32; 2]; 32], bits: &[u32]) -> Self {
@@ -115,7 +114,8 @@ impl FormatInformation {
         // return fi;
     }
 
+    // Hamming distance of the 32 masked codes is 7, by construction, so <= 3 bits differing means we found a match
     pub fn isValid(&self) -> bool {
-        todo!()
+        self.hammingDistance <= 3
     }
 }
diff --git a/src/common/cpp_essentials/fast_edge_to_edge_counter.rs b/src/common/cpp_essentials/fast_edge_to_edge_counter.rs
index c1a5fcb..1016c8a 100644
--- a/src/common/cpp_essentials/fast_edge_to_edge_counter.rs
+++ b/src/common/cpp_essentials/fast_edge_to_edge_counter.rs
@@ -4,6 +4,9 @@ pub struct FastEdgeToEdgeCounter {
     // const uint8_t* p = nullptr;
     // int stride = 0;
     // int stepsToBorder = 0;
+    p: usize,
+    stride: usize,        // = 0;
+    stepsToBorder: usize, // = 0;
 }
 
 impl FastEdgeToEdgeCounter {