1 files changed, 102 insertions, 0 deletions
diff --git a/src/javascript/jsc/builtins/js/ReadableStreamBYOBReader.js b/src/javascript/jsc/builtins/js/ReadableStreamBYOBReader.js
new file mode 100644
index 000000000..16e4ebce5
--- /dev/null
+++ b/src/javascript/jsc/builtins/js/ReadableStreamBYOBReader.js
@@ -0,0 +1,102 @@
+/*
+ * 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.
+ */
+
+function initializeReadableStreamBYOBReader(stream)
+{
+    "use strict";
+
+    if (!@isReadableStream(stream))
+        @throwTypeError("ReadableStreamBYOBReader needs a ReadableStream");
+    if (!@isReadableByteStreamController(@getByIdDirectPrivate(stream, "readableStreamController")))
+        @throwTypeError("ReadableStreamBYOBReader needs a ReadableByteStreamController");
+    if (@isReadableStreamLocked(stream))
+        @throwTypeError("ReadableStream is locked");
+
+    @readableStreamReaderGenericInitialize(this, stream);
+    @putByIdDirectPrivate(this, "readIntoRequests", @createFIFO());
+
+    return this;
+}
+
+function cancel(reason)
+{
+    "use strict";
+
+    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);
+}
+
+function read(view)
+{
+    "use strict";
+
+    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);
+}
+
+function releaseLock()
+{
+    "use strict";
+
+    if (!@isReadableStreamBYOBReader(this))
+        throw @makeThisTypeError("ReadableStreamBYOBReader", "releaseLock");
+
+    if (!@getByIdDirectPrivate(this, "ownerReadableStream"))
+        return;
+
+    if (@getByIdDirectPrivate(this, "readIntoRequests")?.isNotEmpty())
+        @throwTypeError("There are still pending read requests, cannot release the lock");
+
+    @readableStreamReaderGenericRelease(this);
+}
+
+@getter
+function closed()
+{
+    "use strict";
+
+    if (!@isReadableStreamBYOBReader(this))
+        return @Promise.@reject(@makeGetterTypeError("ReadableStreamBYOBReader", "closed"));
+
+    return @getByIdDirectPrivate(this, "closedPromiseCapability").@promise;
+}