wip: reduce to use mostly u8

- TODO: fix the consume_u64 and add checked mul

Author: oleonardolima

fuzz/src/fuzz_utils.rs

@@ -124,8 +124,8 @@ pub fn consume_keychain_indices(
 ) -> BTreeMap<KeychainKind, u32> {
     let mut indices = BTreeMap::new();
     if consume_bool(data) {
-        let count = consume_u32(data);
-        let start = consume_u32(data);
+        let count = consume_u8(data) as u32;
+        let start = consume_u8(data) as u32;
         indices.extend((start..count).map(|idx| (keychain, idx)))
     }
     indices
@@ -196,7 +196,7 @@ pub fn consume_txs(mut data: &[u8], wallet: &mut Wallet) -> Vec<Arc<Transaction>
 
         for _ in 0..txout_count {
             let spk = consume_spk(&mut data, wallet, &mut unique_hash);
-            let sats = consume_u64(&mut data) * 1_000;
+            let sats = (consume_u8(&mut data) as u64) * 1_000;
             let amount = Amount::from_sat(sats);
             let tx_output = TxOut {
                 value: amount,
@@ -228,7 +228,7 @@ pub fn consume_txouts(mut data: &[u8]) -> BTreeMap<OutPoint, TxOut> {
         let prev_vout = consume_u32(&mut data);
         let prev_output = OutPoint::new(prev_txid, prev_vout);
 
-        let sats = consume_u64(&mut data) * 1_000;
+        let sats = (consume_u8(&mut data) as u64) * 1_000;
         let amount = Amount::from_sat(sats);
 
         // TODO: (@leonardo) should we use different spks ?