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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Functions used to build transferable streams.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFERABLE_STREAMS_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFERABLE_STREAMS_H_
#include <memory>
#include "base/types/strong_alias.h"
#include "third_party/blink/renderer/core/core_export.h"
namespace blink {
class ExceptionState;
class MessagePort;
class ReadableStream;
class ReadableStreamTransferringOptimizer;
class ScriptState;
class UnderlyingSourceBase;
class WritableStream;
class WritableStreamTransferringOptimizer;
// A boolean representing whether each chunk can be transferred instead of
// cloned.
using AllowPerChunkTransferring =
base::StrongAlias<class AllowPerChunkTransferringTag, bool>;
// Creates the writable side of a cross-realm identity transform stream, using
// |port| for communication. |port| must be entangled with another MessagePort
// which is passed to CreateCrossRealmTransformReadable().
// Equivalent to SetUpCrossRealmTransformWritable in the standard:
// https://streams.spec.whatwg.org/#abstract-opdef-setupcrossrealmtransformwritable
CORE_EXPORT WritableStream* CreateCrossRealmTransformWritable(
ScriptState*,
MessagePort* port,
AllowPerChunkTransferring,
std::unique_ptr<WritableStreamTransferringOptimizer> optimizer,
ExceptionState&);
// Creates the readable side of a cross-realm identity transform stream. |port|
// is used symmetrically with CreateCrossRealmTransformWritable().
// Equivalent to SetUpCrossRealmTransformReadable in the standard:
// https://streams.spec.whatwg.org/#abstract-opdef-setupcrossrealmtransformreadable
CORE_EXPORT ReadableStream* CreateCrossRealmTransformReadable(
ScriptState*,
MessagePort* port,
std::unique_ptr<ReadableStreamTransferringOptimizer> optimizer,
ExceptionState&);
// Creates a ReadableStream that is identical to the concatenation of
// a ReadableStream created with `source1` and a ReadableStream created with
// `source2`.
// The implementation is optimized with an assumption that `source2` is (much)
// longer than `source1`.
CORE_EXPORT ReadableStream* CreateConcatenatedReadableStream(
ScriptState*,
UnderlyingSourceBase* source1,
UnderlyingSourceBase* source2);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFERABLE_STREAMS_H_
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