Fix Sapling spend parsing

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Orchard note nullifier calculation
+- Sapling spend field parsing
 
 ## [0.5.5.2]
 

librustzcash-wrapper/src/lib.rs

@@ -401,9 +401,9 @@ impl<RW> ToHaskell<RW> for HSBundle {
 
 impl HSBundle {
     pub fn from_bundle(sb: &SaplingBundle<SaplingAuthorized>) -> HSBundle {
-        let s = Cursor::new(Vec::new());
-        sb.authorization().binding_sig.write(s.clone()).unwrap();
-        return HSBundle {empty: false,  spends: Hspend::pack(sb.shielded_spends()) , outputs: HshieldedOutput::pack(sb.shielded_outputs()) , value: i64::from(sb.value_balance()) , sig: s.into_inner() }
+        let mut s: Vec<u8> = Vec::new();
+        sb.authorization().binding_sig.write(&mut s).unwrap();
+        return HSBundle {empty: false,  spends: Hspend::pack(sb.shielded_spends()) , outputs: HshieldedOutput::pack(sb.shielded_outputs()) , value: i64::from(sb.value_balance()) , sig: s }
     }
 }
 
@@ -428,11 +428,11 @@ impl Hspend {
     pub fn pack(sp: &[SpendDescription<SaplingAuthorized>]) -> Vec<Hspend> {
         let mut r = Vec::new();
         for s in sp {
-            let rk = Cursor::new(Vec::new());
-            let authsig = Cursor::new(Vec::new());
-            s.rk().write(rk.clone()).unwrap();
-            s.spend_auth_sig().write(authsig.clone()).unwrap();
-            r.push(Hspend {cv: Hhex{bytes:s.cv().to_bytes().to_vec()}, anchor: Hhex{bytes:s.anchor().to_bytes().to_vec()}, nullifier: Hhex{bytes:s.nullifier().to_vec()}, rk: Hhex{bytes: rk.into_inner()}, proof: Hhex{bytes:s.zkproof().to_vec()}, authsig: Hhex{bytes:authsig.into_inner()}});
+            let mut rk = Vec::new();
+            let mut authsig = Vec::new();
+            s.rk().write(&mut rk).unwrap();
+            s.spend_auth_sig().write(&mut authsig).unwrap();
+            r.push(Hspend {cv: Hhex{bytes:s.cv().to_bytes().to_vec()}, anchor: Hhex{bytes:s.anchor().to_bytes().to_vec()}, nullifier: Hhex{bytes:s.nullifier().to_vec()}, rk: Hhex{bytes: rk}, proof: Hhex{bytes:s.zkproof().to_vec()}, authsig: Hhex{bytes:authsig}});
         }
         return r
     }