Editorial: factor out SetUint8ArrayBytes

spec.html

@@ -91,13 +91,7 @@ <h1>Uint8Array.fromBase64Into ( _string_, _into_ [ , _options_ ] )</h1>
     1. Let _written_ be the length of _bytes_.
     1. NOTE: FromBase64 does not invoke any user code, so the ArrayBuffer backing _into_ cannot have been detached or shrunk.
     1. Assert: _written_ ≤ _byteLength_.
-    1. Let _offset_ be _into_.[[ByteOffset]].
-    1. Let _index_ be 0.
-    1. Repeat, while _index_ < _written_,
-      1. Let _byte_ be _bytes_[_index_].
-      1. Let _byteIndexInBuffer_ be _index_ + _offset_.
-      1. Perform SetValueInBuffer(_into_.[[ViewedArrayBuffer]], _byteIndexInBuffer_, ~uint8~, 𝔽(_byte_), *true*, ~unordered~).
-      1. Set _index_ to _index_ + 1.
+    1. Perform SetUint8ArrayBytes(_into_, _bytes_).
     1. Let _resultObject_ be OrdinaryObjectCreate(%Object.prototype%).
     1. Perform ! CreateDataPropertyOrThrow(_resultObject_, *"read"*, 𝔽(_result_.[[Read]])).
     1. Perform ! CreateDataPropertyOrThrow(_resultObject_, *"written"*, 𝔽(_written_)).
@@ -131,13 +125,7 @@ <h1>Uint8Array.fromHexInto ( _string_, _into_ )</h1>
     1. Let _written_ be the length of _bytes_.
     1. NOTE: FromHex does not invoke any user code, so the ArrayBuffer backing _into_ cannot have been detached or shrunk.
     1. Assert: _written_ ≤ _byteLength_.
-    1. Let _offset_ be _into_.[[ByteOffset]].
-    1. Let _index_ be 0.
-    1. Repeat, while _index_ < _written_,
-      1. Let _byte_ be _bytes_[_index_].
-      1. Let _byteIndexInBuffer_ be _index_ + _offset_.
-      1. Perform SetValueInBuffer(_into_.[[ViewedArrayBuffer]], _byteIndexInBuffer_, ~uint8~, 𝔽(_byte_), *true*, ~unordered~).
-      1. Set _index_ to _index_ + 1.
+    1. Perform SetUint8ArrayBytes(_into_, _bytes_).
     1. Let _resultObject_ be OrdinaryObjectCreate(%Object.prototype%).
     1. Perform ! CreateDataPropertyOrThrow(_resultObject_, *"read"*, 𝔽(_result_.[[Read]])).
     1. Perform ! CreateDataPropertyOrThrow(_resultObject_, *"written"*, 𝔽(_written_)).
@@ -183,6 +171,26 @@ <h1>
   </emu-alg>
 </emu-clause>
 
+<emu-clause id="sec-writeuint8arraybytes" type="abstract operation">
+  <h1>
+    SetUint8ArrayBytes (
+      _into_: a Uint8Array,
+      _bytes_: a List of byte values
+    ): ~unused~
+  </h1>
+  <dl class="header"></dl>
+  <emu-alg>
+    1. Let _offset_ be _into_.[[ByteOffset]].
+    1. Let _len_ be the length of _bytes_.
+    1. Let _index_ be 0.
+    1. Repeat, while _index_ < _len_,
+      1. Let _byte_ be _bytes_[_index_].
+      1. Let _byteIndexInBuffer_ be _index_ + _offset_.
+      1. Perform SetValueInBuffer(_into_.[[ViewedArrayBuffer]], _byteIndexInBuffer_, ~uint8~, 𝔽(_byte_), *true*, ~unordered~).
+      1. Set _index_ to _index_ + 1.
+  </emu-alg>
+</emu-clause>
+
 <emu-clause id="sec-helpers">
   <h1>Helpers</h1>