1 files changed, 93 insertions, 0 deletions
diff --git a/cli/js/streams/readable-stream-byob-reader.ts b/cli/js/streams/readable-stream-byob-reader.ts
new file mode 100644
index 000000000..0f9bfb037
--- /dev/null
+++ b/cli/js/streams/readable-stream-byob-reader.ts
@@ -0,0 +1,93 @@
+// Forked from https://github.com/stardazed/sd-streams/tree/8928cf04b035fd02fb1340b7eb541c76be37e546
+// Copyright (c) 2018-Present by Arthur Langereis - @zenmumbler MIT
+
+/**
+ * streams/readable-stream-byob-reader - ReadableStreamBYOBReader class implementation
+ * Part of Stardazed
+ * (c) 2018-Present by Arthur Langereis - @zenmumbler
+ * https://github.com/stardazed/sd-streams
+ */
+
+import * as rs from "./readable-internals.ts";
+import * as shared from "./shared-internals.ts";
+
+export class SDReadableStreamBYOBReader
+  implements rs.SDReadableStreamBYOBReader {
+  [rs.closedPromise_]: shared.ControlledPromise<void>;
+  [rs.ownerReadableStream_]: rs.SDReadableStream<ArrayBufferView> | undefined;
+  [rs.readIntoRequests_]: Array<
+    rs.ReadRequest<IteratorResult<ArrayBufferView>>
+  >;
+
+  constructor(stream: rs.SDReadableStream<ArrayBufferView>) {
+    if (!rs.isReadableStream(stream)) {
+      throw new TypeError();
+    }
+    if (
+      !rs.isReadableByteStreamController(stream[rs.readableStreamController_])
+    ) {
+      throw new TypeError();
+    }
+    if (rs.isReadableStreamLocked(stream)) {
+      throw new TypeError("The stream is locked.");
+    }
+    rs.readableStreamReaderGenericInitialize(this, stream);
+    this[rs.readIntoRequests_] = [];
+  }
+
+  get closed(): Promise<void> {
+    if (!rs.isReadableStreamBYOBReader(this)) {
+      return Promise.reject(new TypeError());
+    }
+    return this[rs.closedPromise_].promise;
+  }
+
+  cancel(reason: shared.ErrorResult): Promise<void> {
+    if (!rs.isReadableStreamBYOBReader(this)) {
+      return Promise.reject(new TypeError());
+    }
+    const stream = this[rs.ownerReadableStream_];
+    if (stream === undefined) {
+      return Promise.reject(
+        new TypeError("Reader is not associated with a stream")
+      );
+    }
+    return rs.readableStreamCancel(stream, reason);
+  }
+
+  read(view: ArrayBufferView): Promise<IteratorResult<ArrayBufferView>> {
+    if (!rs.isReadableStreamBYOBReader(this)) {
+      return Promise.reject(new TypeError());
+    }
+    if (this[rs.ownerReadableStream_] === undefined) {
+      return Promise.reject(
+        new TypeError("Reader is not associated with a stream")
+      );
+    }
+    if (!ArrayBuffer.isView(view)) {
+      return Promise.reject(
+        new TypeError("view argument must be a valid ArrayBufferView")
+      );
+    }
+    // If ! IsDetachedBuffer(view.[[ViewedArrayBuffer]]) is true, return a promise rejected with a TypeError exception.
+    if (view.byteLength === 0) {
+      return Promise.reject(
+        new TypeError("supplied buffer view must be > 0 bytes")
+      );
+    }
+    return rs.readableStreamBYOBReaderRead(this, view, true);
+  }
+
+  releaseLock(): void {
+    if (!rs.isReadableStreamBYOBReader(this)) {
+      throw new TypeError();
+    }
+    if (this[rs.ownerReadableStream_] === undefined) {
+      throw new TypeError("Reader is not associated with a stream");
+    }
+    if (this[rs.readIntoRequests_].length > 0) {
+      throw new TypeError();
+    }
+    rs.readableStreamReaderGenericRelease(this);
+  }
+}