blob: 126d6c5d137e2905347c418a64bb2b4d543a6da4 [file] [log] [blame]
// Copyright 2013 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.
#include <stdint.h>
#include <memory>
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "mojo/public/cpp/bindings/binding.h"
#include "mojo/public/cpp/system/data_pipe_drainer.h"
#include "third_party/blink/public/mojom/blob/blob.mojom.h"
#include "url/gurl.h"
namespace content {
class BrowserContext;
// This class may only be used from the UI thread. It self-deletes when finished
// reading.
class BlobReader : public blink::mojom::BlobReaderClient,
public mojo::DataPipeDrainer::Client {
// |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 -1 if it cannot be determined.
typedef base::OnceCallback<void(std::unique_ptr<std::string> blob_data,
int64_t blob_total_size)>
BlobReader(content::BrowserContext* browser_context,
const std::string& blob_uuid,
BlobReadCallback callback);
BlobReader(blink::mojom::BlobPtr blob, BlobReadCallback callback);
~BlobReader() override;
void SetByteRange(int64_t offset, int64_t length);
void Start();
// 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(const void* data, size_t num_bytes) override;
void OnDataComplete() override;
void Failed();
void Succeeded();
BlobReadCallback callback_;
blink::mojom::BlobPtr blob_;
struct Range {
uint64_t offset;
uint64_t length;
base::Optional<Range> read_range_;
mojo::Binding<blink::mojom::BlobReaderClient> binding_;
std::unique_ptr<mojo::DataPipeDrainer> data_pipe_drainer_;
base::Optional<uint64_t> blob_length_;
std::unique_ptr<std::string> blob_data_;
bool data_complete_ = false;