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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_BROWSER_BLOB_READER_H_
#define EXTENSIONS_BROWSER_BLOB_READER_H_
#include <stdint.h>
#include <memory>
#include <string>
#include "base/functional/callback.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/system/data_pipe_drainer.h"
#include "third_party/blink/public/mojom/blob/blob.mojom.h"
// This class may only be used from the UI thread.
class BlobReader : public blink::mojom::BlobReaderClient,
public mojo::DataPipeDrainer::Client {
public:
// `blob_data` contains the portion of the Blob requested. `blob_total_size`
// is the total size of the Blob, and may be larger than `blob_data->size()`.
// `blob_total_size` is 0 if it cannot be determined.
using BlobReadCallback =
base::OnceCallback<void(std::string blob_data, int64_t blob_total_size)>;
static void Read(mojo::PendingRemote<blink::mojom::Blob> blob,
BlobReadCallback callback,
uint64_t offset,
uint64_t length);
static void Read(mojo::PendingRemote<blink::mojom::Blob> blob,
BlobReadCallback callback);
BlobReader(const BlobReader&) = delete;
BlobReader& operator=(const BlobReader&) = delete;
~BlobReader() override;
private:
struct Range {
uint64_t offset;
uint64_t length;
};
static void Read(mojo::PendingRemote<blink::mojom::Blob> blob,
BlobReadCallback callback,
std::optional<Range> range);
BlobReader(mojo::PendingRemote<blink::mojom::Blob> blob,
std::optional<Range> range);
void Start(base::OnceClosure callback);
// blink::mojom::BlobReaderClient:
void OnCalculatedSize(uint64_t total_size,
uint64_t expected_content_size) override;
void OnComplete(int32_t status, uint64_t data_length) override {}
// mojo::DataPipeDrainer:
void OnDataAvailable(base::span<const uint8_t> data) override;
void OnDataComplete() override;
void Failed();
void Succeeded();
base::OnceClosure callback_;
mojo::Remote<blink::mojom::Blob> blob_;
std::optional<Range> read_range_;
mojo::Receiver<blink::mojom::BlobReaderClient> receiver_{this};
std::unique_ptr<mojo::DataPipeDrainer> data_pipe_drainer_;
std::optional<uint64_t> blob_length_;
std::string blob_data_;
bool data_complete_ = false;
};
#endif // EXTENSIONS_BROWSER_BLOB_READER_H_
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