Publish a decoder, to make testing a bit easier.

src/cryptonum/encoding.rs

@@ -6,29 +6,33 @@ pub trait Decoder {
     fn from_bytes(x: &[u8]) -> Self;
 }
 
-macro_rules! generate_decoder {
-    ($name: ident) => {
-        impl Decoder for $name {
-            fn from_bytes(x: &[u8]) -> $name {
-                let mut res = $name::new();
+pub(crate) fn raw_decoder(input: &[u8], output: &mut [u64])
+{
     let mut item = 0;
     let mut shift = 0;
     let mut idx = 0;
 
-                for v in x.iter().rev() {
+    for v in input.iter().rev() {
         item |= (*v as u64) << shift;
         shift += 8;
         if shift == 64 {
             shift = 0;
-                        res.values[idx] = item;
+            output[idx] = item;
             idx += 1;
             item = 0;
         }
     }
     if item != 0 {
-                    res.values[idx] = item;
+        output[idx] = item;
+    }
 }
 
+macro_rules! generate_decoder {
+    ($name: ident) => {
+        impl Decoder for $name {
+            fn from_bytes(x: &[u8]) -> $name {
+                let mut res = $name::new();
+                raw_decoder(x, &mut res.values);
                 res
             }
         }