Move boolean_bitfield into own crate

Cargo.toml

@@ -8,6 +8,7 @@ authors = ["Paul Hauner <paul@paulhauner.com>"]
 blake2 = "^0.7.1"
 blake2-rfc = "0.2.18"
 bls = { git = "https://github.com/sigp/bls" }
+boolean-bitfield = { path = "boolean-bitfield" }
 bytes = ""
 crypto-mac = "^0.6.2"
 clap = "2.32.0"

boolean-bitfield/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "boolean-bitfield"
+version = "0.1.0"
+authors = ["Paul Hauner <paul@paulhauner.com>"]
+
+[dependencies]

boolean-bitfield/README.md

@@ -0,0 +1,7 @@
+# Boolean Bitfield
+
+A work-in-progress implementation of an unbounded boolean bitfield.
+
+Based upon a `Vec<u8>`
+
+Documentation TBC...

boolean-bitfield/src/lib.rs

@@ -6,9 +6,7 @@
  * A future implementation should be more efficient,
  * this is just to get the job done for now.
  */
-extern crate rlp;
 use std::cmp::max;
-use self::rlp::{ RlpStream, Encodable };
 
 #[derive(Eq)]
 pub struct BooleanBitfield{
@@ -100,17 +98,6 @@ impl Clone for BooleanBitfield {
 }
 
 
-impl Encodable for BooleanBitfield {
-    // TODO: ensure this is a sensible method of encoding
-    // the bitfield. Currently, it is treated as a list of 
-    // bytes not as a string. I do not have any guidance as 
-    // to which method is correct -- don't follow my lead
-    // without seeking authoritative advice.
-    fn rlp_append(&self, s: &mut RlpStream) {
-        s.append(&self.to_be_vec());
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -172,16 +159,6 @@ mod tests {
         } 
     }
     
-    #[test]
-    fn test_bitfield_rlp_serialization() {
-        let mut b = BooleanBitfield::new();
-        b.set_bit(&15, &true);
-        let e = rlp::encode(&b);
-        assert_eq!(e[0], 130);
-        assert_eq!(e[1], 128);
-        assert_eq!(e[2], 0);
-    }
-    
     #[test]
     fn test_bitfield_num_true_bits() {
         let mut b = BooleanBitfield::new();

lighthouse/utils/mod.rs

@@ -1,9 +1,9 @@
 extern crate ethereum_types;
 extern crate blake2;
 extern crate crypto_mac;
+extern crate boolean_bitfield;
 
 pub mod types;
 pub mod bls;
 pub mod test_helpers;
-pub mod boolean_bitfield;
 pub mod logging;

lighthouse/utils/types.rs

@@ -1,5 +1,7 @@
+extern crate boolean_bitfield;
+
 use super::ethereum_types::{ H256, H160 };
-use super::boolean_bitfield::BooleanBitfield;
+use self::boolean_bitfield::BooleanBitfield;
 
 pub use super::blake2::Blake2s;
 pub use super::ethereum_types::U256;