1 files changed, 77 insertions, 0 deletions
diff --git a/js/src/builtin/streams/PullIntoDescriptor.h b/js/src/builtin/streams/PullIntoDescriptor.h
new file mode 100644
index 0000000000..41378dd92e
--- /dev/null
+++ b/js/src/builtin/streams/PullIntoDescriptor.h
@@ -0,0 +1,77 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Pull descriptor objects for tracking byte stream pull-into requests. */
+
+#ifndef builtin_streams_PullIntoDescriptor_h
+#define builtin_streams_PullIntoDescriptor_h
+
+#include <stdint.h>  // int32_t, uint32_t
+
+#include "js/Class.h"              // JSClass
+#include "vm/ArrayBufferObject.h"  // js::ArrayBufferObject;
+#include "vm/NativeObject.h"       // js::NativeObject
+
+namespace js {
+
+enum class ReaderType : int32_t { Default = 0, BYOB = 1 };
+
+class PullIntoDescriptor : public NativeObject {
+ private:
+  enum Slots {
+    Slot_buffer,
+    Slot_ByteOffset,
+    Slot_ByteLength,
+    Slot_BytesFilled,
+    Slot_ElementSize,
+    Slot_Ctor,
+    Slot_ReaderType,
+    SlotCount
+  };
+
+ public:
+  static const JSClass class_;
+
+  ArrayBufferObject* buffer() {
+    return &getFixedSlot(Slot_buffer).toObject().as<ArrayBufferObject>();
+  }
+  void setBuffer(ArrayBufferObject* buffer) {
+    setFixedSlot(Slot_buffer, ObjectValue(*buffer));
+  }
+  JSObject* ctor() { return getFixedSlot(Slot_Ctor).toObjectOrNull(); }
+  uint32_t byteOffset() const {
+    return getFixedSlot(Slot_ByteOffset).toInt32();
+  }
+  uint32_t byteLength() const {
+    return getFixedSlot(Slot_ByteLength).toInt32();
+  }
+  uint32_t bytesFilled() const {
+    return getFixedSlot(Slot_BytesFilled).toInt32();
+  }
+  void setBytesFilled(int32_t bytes) {
+    setFixedSlot(Slot_BytesFilled, Int32Value(bytes));
+  }
+  uint32_t elementSize() const {
+    return getFixedSlot(Slot_ElementSize).toInt32();
+  }
+  ReaderType readerType() const {
+    int32_t n = getFixedSlot(Slot_ReaderType).toInt32();
+    MOZ_ASSERT(n == int32_t(ReaderType::Default) ||
+               n == int32_t(ReaderType::BYOB));
+    return ReaderType(n);
+  }
+
+  static PullIntoDescriptor* create(JSContext* cx,
+                                    JS::Handle<ArrayBufferObject*> buffer,
+                                    uint32_t byteOffset, uint32_t byteLength,
+                                    uint32_t bytesFilled, uint32_t elementSize,
+                                    JS::Handle<JSObject*> ctor,
+                                    ReaderType readerType);
+};
+
+}  // namespace js
+
+#endif  // builtin_streams_PullIntoDescriptor_h