1 files changed, 80 insertions, 0 deletions
diff --git a/src/js/builtins/ReadableStreamBYOBReader.ts b/src/js/builtins/ReadableStreamBYOBReader.ts
new file mode 100644
index 000000000..5ebfddb19
--- /dev/null
+++ b/src/js/builtins/ReadableStreamBYOBReader.ts
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2017 Canon Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CANON INC. AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL CANON INC. AND ITS CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+export function initializeReadableStreamBYOBReader(this, stream) {
+  if (!$isReadableStream(stream)) throw new TypeError("ReadableStreamBYOBReader needs a ReadableStream");
+  if (!$isReadableByteStreamController($getByIdDirectPrivate(stream, "readableStreamController")))
+    throw new TypeError("ReadableStreamBYOBReader needs a ReadableByteStreamController");
+  if ($isReadableStreamLocked(stream)) throw new TypeError("ReadableStream is locked");
+
+  $readableStreamReaderGenericInitialize(this, stream);
+  $putByIdDirectPrivate(this, "readIntoRequests", $createFIFO());
+
+  return this;
+}
+
+export function cancel(this, reason) {
+  if (!$isReadableStreamBYOBReader(this))
+    return Promise.$reject($makeThisTypeError("ReadableStreamBYOBReader", "cancel"));
+
+  if (!$getByIdDirectPrivate(this, "ownerReadableStream"))
+    return Promise.$reject($makeTypeError("cancel() called on a reader owned by no readable stream"));
+
+  return $readableStreamReaderGenericCancel(this, reason);
+}
+
+export function read(this, view: DataView) {
+  if (!$isReadableStreamBYOBReader(this))
+    return Promise.$reject($makeThisTypeError("ReadableStreamBYOBReader", "read"));
+
+  if (!$getByIdDirectPrivate(this, "ownerReadableStream"))
+    return Promise.$reject($makeTypeError("read() called on a reader owned by no readable stream"));
+
+  if (!$isObject(view)) return Promise.$reject($makeTypeError("Provided view is not an object"));
+
+  if (!ArrayBuffer.$isView(view)) return Promise.$reject($makeTypeError("Provided view is not an ArrayBufferView"));
+
+  if (view.byteLength === 0) return Promise.$reject($makeTypeError("Provided view cannot have a 0 byteLength"));
+
+  return $readableStreamBYOBReaderRead(this, view);
+}
+
+export function releaseLock(this) {
+  if (!$isReadableStreamBYOBReader(this)) throw $makeThisTypeError("ReadableStreamBYOBReader", "releaseLock");
+
+  if (!$getByIdDirectPrivate(this, "ownerReadableStream")) return;
+
+  if ($getByIdDirectPrivate(this, "readIntoRequests")?.isNotEmpty())
+    throw new TypeError("There are still pending read requests, cannot release the lock");
+
+  $readableStreamReaderGenericRelease(this);
+}
+
+$getter;
+export function closed(this) {
+  if (!$isReadableStreamBYOBReader(this))
+    return Promise.$reject($makeGetterTypeError("ReadableStreamBYOBReader", "closed"));
+
+  return $getByIdDirectPrivate(this, "closedPromiseCapability").$promise;
+}