Add support for more typed data types on native ports

runtime/bin/file.cc

Index: runtime/bin/file.cc
diff --git a/runtime/bin/file.cc b/runtime/bin/file.cc
index f04a36796801de3ff497124e4797299c2b3d3ac7..4b6ffcf6449a64b9071701cac9f3199cf174d7aa 100644
--- a/runtime/bin/file.cc
+++ b/runtime/bin/file.cc
@@ -965,10 +965,26 @@ static CObject* FileReadListRequest(const CObjectArray& request) {
 }
 
 
+static int SizeInBytes(Dart_CObject::ByteArrayType type) {
+  switch (type) {
+    case Dart_CObject::kInt8Array:
+    case Dart_CObject::kUint8Array:
+      return 1;
+    case Dart_CObject::kInt16Array:
+    case Dart_CObject::kUint16Array:
+      return 2;
+    default:
+      break;
+  }
+  UNREACHABLE();
+  return -1;
+}
+
+
 static CObject* FileWriteListRequest(const CObjectArray& request) {
   if (request.Length() == 5 &&
       request[1]->IsIntptr() &&
-      (request[2]->IsUint8Array() || request[2]->IsArray()) &&
+      (request[2]->IsByteArray() || request[2]->IsArray()) &&
       request[3]->IsInt32OrInt64() &&
       request[4]->IsInt32OrInt64()) {
     File* file = CObjectToFilePointer(request[1]);
@@ -977,8 +993,10 @@ static CObject* FileWriteListRequest(const CObjectArray& request) {
       int64_t offset = CObjectInt32OrInt64ToInt64(request[3]);
       int64_t length = CObjectInt32OrInt64ToInt64(request[4]);
       uint8_t* buffer_start;
-      if (request[2]->IsUint8Array()) {
-        CObjectUint8Array byte_array(request[2]);
+      if (request[2]->IsByteArray()) {
+        CObjectByteArray byte_array(request[2]);
+        offset = offset * SizeInBytes(byte_array.Type());
+        length = length * SizeInBytes(byte_array.Type());
         buffer_start = byte_array.Buffer() + offset;
       } else {
         CObjectArray array(request[2]);
@@ -997,7 +1015,7 @@ static CObject* FileWriteListRequest(const CObjectArray& request) {
       }
       int64_t bytes_written =
           file->Write(reinterpret_cast<void*>(buffer_start), length);
-      if (!request[2]->IsUint8Array()) {
+      if (!request[2]->IsByteArray()) {
         delete[] buffer_start;
       }
       if (bytes_written >= 0) {