Allow extrinsic length encoding to operate on u8a[] (#148)

packages/type-extrinsics/src/codec/encode/length.ts

@@ -2,14 +2,16 @@
 // This software may be modified and distributed under the terms
 // of the ISC license. See the LICENSE file for details.
 
-import { UncheckedRaw } from '@polkadot/primitives/extrinsic';
-
 import bnToU8a from '@polkadot/util/bn/toU8a';
 import u8aConcat from '@polkadot/util/u8a/concat';
 
-export default function encodeLength (unchecked: UncheckedRaw): Uint8Array {
+export default function encodeLength (...values: Array<Uint8Array>): Uint8Array {
+  const length = values.reduce((length, u8a) => {
+    return length + u8a.length;
+  }, 0);
+
   return u8aConcat(
-    bnToU8a(unchecked.length, 32, true),
-    unchecked
+    bnToU8a(length, 32, true),
+    ...values
   );
 }

packages/type-primitives/src/codec/block/encodeRaw.ts

@@ -13,7 +13,9 @@ export default function encodeBlockRaw (header: Uint8Array, extrinsics: Array<Un
   return u8aConcat(
     header,
     encodeArray(
-      extrinsics.map(uncheckedLength)
+      extrinsics.map((extrinsic) =>
+        uncheckedLength(extrinsic)
+      )
     )
   );
 }

packages/type-primitives/src/create/extrinsic/rootRaw.ts

@@ -9,6 +9,8 @@ import trieRootOrdered from '@polkadot/trie-hash/rootOrdered';
 
 export default function extrinsicsRootRaw (extrinsics: Array<UncheckedRaw> = []): Uint8Array {
   return trieRootOrdered(
-    extrinsics.map(uncheckedLength)
+    extrinsics.map((extrinsic) =>
+      uncheckedLength(extrinsic)
+    )
   );
 }