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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_BLOB_BLOB_BYTES_PROVIDER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BLOB_BLOB_BYTES_PROVIDER_H_
#include "base/sequenced_task_runner.h"
#include "third_party/blink/public/mojom/blob/blob_registry.mojom-blink-forward.h"
#include "third_party/blink/public/mojom/blob/data_element.mojom-blink.h"
#include "third_party/blink/renderer/platform/blob/blob_data.h"
namespace blink {
// Implementation of the BytesProvider mojo interface, used to transport bytes
// making up a blob to the browser process, at the request of the blob service.
//
// Typical usage of this class creates and calls AppendData on one thread, and
// then transfers ownership of the class to a different thread where it will be
// bound to a mojo pipe, such that the various Request* methods are called on a
// thread that is allowed to do File IO.
class PLATFORM_EXPORT BlobBytesProvider : public mojom::blink::BytesProvider {
public:
// All consecutive items that are accumulate to < this number will have the
// data appended to the same item.
static constexpr size_t kMaxConsolidatedItemSizeInBytes = 15 * 1024;
// Creates a new instance, and binds it on a new SequencedTaskRunner. The
// returned instance should only be considered valid as long as the request
// passed in to this method is still known to be valid.
static BlobBytesProvider* CreateAndBind(
mojo::PendingReceiver<mojom::blink::BytesProvider>);
static std::unique_ptr<BlobBytesProvider> CreateForTesting(
scoped_refptr<base::SequencedTaskRunner>);
~BlobBytesProvider() override;
void AppendData(scoped_refptr<RawData>);
void AppendData(base::span<const char>);
// BytesProvider implementation:
void RequestAsReply(RequestAsReplyCallback) override;
void RequestAsStream(mojo::ScopedDataPipeProducerHandle) override;
void RequestAsFile(uint64_t source_offset,
uint64_t source_size,
base::File,
uint64_t file_offset,
RequestAsFileCallback) override;
private:
FRIEND_TEST_ALL_PREFIXES(BlobBytesProviderTest, Consolidation);
BlobBytesProvider(scoped_refptr<base::SequencedTaskRunner>);
// The task runner this class is bound on, as well as what is used by the
// RequestAsStream method to monitor the data pipe.
scoped_refptr<base::SequencedTaskRunner> task_runner_;
Vector<scoped_refptr<RawData>> data_;
// |offsets_| always contains exactly one fewer item than |data_| (except when
// |data_| itself is empty).
// offsets_[x] is equal to the sum of data_[i].length for all i <= x.
Vector<uint64_t> offsets_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BLOB_BLOB_BYTES_PROVIDER_H_
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