chromium/storage/browser/blob/blob_reader.h

// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef STORAGE_BROWSER_BLOB_BLOB_READER_H_
#define STORAGE_BROWSER_BLOB_BLOB_READER_H_

#include <stddef.h>
#include <stdint.h>

#include <map>
#include <memory>
#include <optional>
#include <vector>

#include "base/component_export.h"
#include "base/functional/callback_forward.h"
#include "base/functional/callback_helpers.h"
#include "base/gtest_prod_util.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "components/file_access/scoped_file_access.h"
#include "components/file_access/scoped_file_access_delegate.h"
#include "mojo/public/cpp/base/big_buffer.h"
#include "mojo/public/cpp/system/data_pipe.h"
#include "net/base/completion_once_callback.h"
#include "services/network/public/cpp/data_pipe_to_source_stream.h"
#include "storage/browser/blob/blob_storage_constants.h"

class GURL;

namespace base {
class FilePath;
class TaskRunner;
class Time;
}

namespace net {
class DrainableIOBuffer;
class IOBuffer;
}

namespace storage {
class BlobDataItem;
class BlobDataHandle;
class BlobDataSnapshot;
class FileStreamReader;

// The blob reader is used to read a blob.  This can only be used in the browser
// process, and we need to be on the IO thread.
//  * There can only be one read happening at a time per reader.
//  * If a status of Status::NET_ERROR is returned, that means there was an
//    error and the net_error() variable contains the error code.
// Use a BlobDataHandle to create an instance.
//
// For more information on how to read Blobs in your specific situation, see:
// https://chromium.googlesource.com/chromium/src/+/HEAD/storage/browser/blob/README.md#how-to-use-blobs-browser_side-accessing-reading
class COMPONENT_EXPORT(STORAGE_BROWSER) BlobReader { … };

}  // namespace storage
#endif  // STORAGE_BROWSER_BLOB_BLOB_READER_H_