AK: Add OutputMemoryStream::fill_to_end.

AK/MemoryStream.h

@@ -186,6 +186,13 @@ public:
         return true;
     }
 
+    size_t fill_to_end(u8 value)
+    {
+        const auto nwritten = m_bytes.slice(m_offset).fill(value);
+        m_offset += nwritten;
+        return nwritten;
+    }
+
     ReadonlyBytes bytes() const { return { data(), size() }; }
     Bytes bytes() { return { data(), size() }; }
 

AK/Span.h

@@ -165,11 +165,12 @@ public:
         return TypedTransfer<typename RemoveConst<T>::Type>::copy(other.data(), data(), count);
     }
 
-    ALWAYS_INLINE void fill(const T& value)
+    ALWAYS_INLINE size_t fill(const T& value)
     {
-        for (size_t idx = 0; idx < size(); ++idx) {
+        for (size_t idx = 0; idx < size(); ++idx)
             data()[idx] = value;
-        }
+
+        return size();
     }
 
     bool contains_slow(const T& value) const